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WO1997028951A1 - Process for the production of weld seams on plastic parts, especially a pipe-welding process, pipeline system with pipe connections produced according to this process as well as the use of an hf generator for the carrying out of this process - Google Patents

Process for the production of weld seams on plastic parts, especially a pipe-welding process, pipeline system with pipe connections produced according to this process as well as the use of an hf generator for the carrying out of this process Download PDF

Info

Publication number
WO1997028951A1
WO1997028951A1 PCT/AT1997/000023 AT9700023W WO9728951A1 WO 1997028951 A1 WO1997028951 A1 WO 1997028951A1 AT 9700023 W AT9700023 W AT 9700023W WO 9728951 A1 WO9728951 A1 WO 9728951A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
welding
profile body
plastic
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/AT1997/000023
Other languages
German (de)
French (fr)
Inventor
Heinz Stampfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO1997028951A1 publication Critical patent/WO1997028951A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/32—Induction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/242—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool the heat transfer being achieved by contact, i.e. a heated tool being brought into contact with the welding tool and afterwards withdrawn from it
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • B29C66/3242—Avoiding burr formation on the inside of a tubular or hollow article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
    • B29C66/3472—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients in the plane of the joint, e.g. along the joint line in the plane of the joint or perpendicular to the joint line in the plane of the joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/348—Avoiding melting or weakening of the zone directly next to the joint area, e.g. by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52296—Joining tubular articles involving the use of a socket said socket comprising sealing elements, e.g. gaskets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/63—Internally supporting the article during joining
    • B29C66/634—Internally supporting the article during joining using an inflatable core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/63—Internally supporting the article during joining
    • B29C66/636—Internally supporting the article during joining using a support which remains in the joined object
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81815—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/002—Panels; Plates; Sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Definitions

  • the invention relates to a process for producing weld seams on plastic parts, in particular pipe welding processes, in which the supply of the thermal energy for heating the welding zone takes place at least mainly from a heated metal body.
  • the invention further relates to a piping system with pipe connections produced by this process, and the use of an HF Generator to perform this procedure.
  • Pipe welding processes that work according to this principle are e.g. B. electric socket welding process in which the heated metal body consists of an electrically heated heating coil and how z. B. are known from EP 0689931 A2. The cost of materials in these processes is relatively high.
  • the invention is based on the object of specifying a method of the type mentioned which can be used in general and not only for pipe welding and which is less complex in terms of pipe welding than an electric socket welding method.
  • the welding period can be shortened not insignificantly by accelerated cooling of the welding zone.
  • the method according to the invention is first characterized in that the edges or ends of the parts to be welded, which may be held in abutment, are bridged by a holding profile body which bears on both sides of the weld seam on surface edge regions of these parts, that the metal body to be heated is inductively heated while he is in thermal conduction with said surface edge areas either directly or via the holding profile body, the two outer edges of the holding profile body, which are in thermal conduction contact with the surface edge areas, being kept at temperatures which are lower than the softening temperature of the plastic.
  • the holding profile body is designed as a coupling sleeve which bears on the outer or inner surfaces of the pipe ends to be welded to one another.
  • a pipe welding process in which the pipe parts are connected by welding and in which the heat is supplied by heating in an HF field is known, for example, from DPS 802282. In this process, two pipe ends which are inserted into one another are welded to one another. For example, metal foils are arranged in which currents are induced in the HF field, which lead to the heating of the welding zone. This method, which does not lead to a homogeneous welding zone, has not been used in practice
  • said outer edges of the holding profile body are cooled by cooling profile sections or cooling bodies which absorb excess amounts of heat
  • the coupling sleeves used consist, at least at their end areas, of a material with low thermal conductivity, preferably plastic
  • a support device advantageously a support sleeve, is provided on the side opposite the coupling sleeve with respect to the pipe ends, and is advantageously in contact with the inner or outer pipe end surfaces
  • the inserted coupling sleeve is designed to be divisible and is removed for reuse after the welding process
  • a profile body made of the welding plastic is arranged at the location of the weld between the holding profile body and the surface edge regions of the parts to be welded to one another, which connects to the parts to be welded during the welding process.
  • This profile body is a socket in pipe connections educated
  • a gap existing between the bodies to be welded is sealed by a sealing material, in particular by a sealing profile body, during the welding process
  • FIGS. 1 and 2 show the arrangement for welding two pipes together in the longitudinal or cross-section, along the lines II-II or II
  • the outer and inner diameters of the pipe ends 1, 1 ' are calibrated to the specified diameter by mechanical processing.
  • the coupling sleeve 2 used is part of the welding device. It consists of two half-shells 3, 3' of a cast part made of aluminum or another non-ferromagnetic metal are held together along the parting line indicated by 4 and as an overall sleeve have an essentially rotationally symmetrical shape.
  • the coupling sleeve 2 has a thickening 5 in the middle, at the welding point, to which two tubular sections 6, 6 'with a lesser amount on both sides Wall strong connect which of their at the ends merge into two cooling heads 7,7 '.
  • the two half-shells 3,3' are closed in a precisely defined position by two pins 8,8 'and two annular springs 9,9' in ring grooves of the cooling heads 7,7 ' held to each other
  • the half-shells of an overall tubular heating sleeve 10 made of steel are screwed onto the two half-shells of the thickening 5
  • the coupling sleeve 2 is pushed over the two pipe ends 1, 1 '.
  • a pipe sleeve 11, which lies against the inner surfaces of the pipe ends and bridges them, is arranged within the pipe ends 1, 1' and, in the given example, is made of a high-melting point casting Plastic consists.
  • the pipe ends 1, 1 ' are then pressed against one another by means of a device, not shown in the figures, in the direction of the arrows 12, 12'
  • the heating unit used in the method consists of the oscillator part 13 of an HF generator, to the electrical output of which a water-cooled inductor bent from copper pipes is connected.
  • the inductor has a protective housing 14 made of a fiber-reinforced thermoset, which is provided with positioning slots 15 and consists of two longitudinally parallel planes, spirally wound plate inductors 16
  • the heating unit is now positioned over the coupling sleeve 2 such that the planes of the plate inductors 16 and the parting plane 4 of the coupling sleeve halves are parallel to one another.
  • guide edges 17 are provided on the cooling heads 7, 7 ', along which the Protective housing 14 is pushed on
  • the HF generator which works with a frequency in the range of 75 - 175 kHz, for example, is now switched on. 10 currents are mainly induced in the halves of the heating sleeve, which within a few seconds heat them up to temperatures that are around 100 - 200 ° C higher than the melting temperature of the tubular plastic During the heating period, ie when the HF generator is switched on, heat flows continuously from the heating sleeve halves into the coupling sleeve 2 and thereby largely penetrates into the two pipe ends 1, 1 '. Another part flows out within the coupling sleeve 2 in the direction of the two cooling heads 7, 7 '. The volume and shape of the two cooling heads 7, 7 'are selected so that they remain below the softening temperature of the tube material during the heating period.
  • the heating unit can be removed immediately.
  • the tube material has melted in a volume region, the inner boundary of which is indicated by the dashed line 18.
  • rapid temperature compensation takes place via the mass of the coupling sleeve 2, the compensation temperature also remaining below the softening temperature of the pipe material because of the predominant heat storage capacity of the cooling heads 7, 7 '.
  • the coupling sleeve 2 now serves to cool the melted pipe material and thus causes the welding zone to cool down more quickly.
  • the coupling sleeve 2 is then removed from the welding zone. The welding is so perfect that the original joint between the pipe ends 1, 1 'can no longer be seen.
  • a bellows attached to the pipe system at the location of the weld and held at an excess pressure of 1-3 bar can also serve as a support device, which relieves the pressure after the welding process and leaves the pipe system is pulled out.
  • a bellows is known from EP 0689931 A2.
  • FIG. 3 shows a partial view in longitudinal section of the two pipe ends 1, 1 'between which a sleeve 19 made of tubular plastic is arranged, against the annular rib 20 of which the pipe ends 1, 1' are pushed.
  • a sealing ring 21 made of silicone rubber is also provided within the rib 20.
  • the heating sleeve 10 made of structural steel which had a weight of 28 g, was operated at a frequency of 162 kHz for 20 s heated to 300 ° C with an inductor power of 900 W.
  • the wall thickness of sections 6.6 'of coupling sleeve 2 was 0.5 mm, the cooling heads 7.7' made of aluminum had a total weight of 165 g
  • the method according to the invention can now be used not only for tube welding, but very generally for producing weld seams for connecting, for example, plate-shaped plastic parts.
  • Such a variant of the method will now be explained with reference to FIGS. 4 and 5, which are shown in cross-section or in a longitudinal section along the lines V and IV show a corresponding arrangement
  • Two plates 24, 24 ' are to be welded together at the point 25.
  • a holding profile body covering the edges of the plates 24, 24' to be welded is attached, which consists of an aluminum foil 26 and the actual support profile body 27 is the support profile body 27 is an aluminum profile body with a thickening 28 in the middle, to which two thin-walled sections 29 connect, which merge into two cooling profile sections 30.
  • the support profile body 27 is divided transversely to its longitudinal extension by slots 31 which a heat flow in Interfering with the direction of the longitudinal extension of the profile.
  • Radiators 32 in the form of steel plates are each fastened to the sections of the thickening 28
  • An oscillator part 34 of an HF generator which is provided with an inductor 33, is used to heat the radiators.
  • the inductor 33 which has a structure similar to that described with reference to FIG. 1, is arranged above the radiator 32.
  • the HF generator is switched on for the heating process and the Oscillator part 34 with the inductor 33 moves along the holding profile body 27 in the direction of arrow 35.
  • the heat generated in the radiators 32 flows, analogously to the tube welding methods described above, to a large extent into the welding region and melts the plastic there in one the dashed line 36 delimited region to the heating period is ended after the inductor 33 has moved on for each specific location of the weld seam.
  • the remaining portions of the holding profile body 27 then bring about an accelerated cooling of the welding zone suitable diameter
  • the holding profile body is bent into a tire and stretched over the location of the weld seam to be formed.
  • the inductor can here stationary and the two pipes to be welded together are rotated relative to the inductor
  • One of the functions of the coupling sleeve or the holding profile body is to form a fixed spatial limitation for the material and also to keep the two pipe ends axially aligned in pipe welding processes.Therefore, it is an important prerequisite for the functioning of the process that the ends of the coupling sleeve or the outer edges of the holding profile body are kept at temperatures which are below the softening temperature of the welding plastic. In the process variants described above, this is achieved by the cooling heads or cooling profile sections
  • a coupling sleeve is used in pipe welding processes, which consists at least in its end regions of a material of low thermal conductivity
  • FIG. 6 shows such a coupling sleeve 37 in longitudinal section. It consists of a plastic molded casting, for example of glass fiber reinforced PBT (polybutylene terephthalate), in which a heat concentrating lining 38 in the form of an aluminum bushing is integrated Outer surfaces of the pipe ends 1, 1 'A heating sleeve 39 consisting of two half-shells made of steel is fastened to the concentrating chuck outer surface. The cooling bodies are unnecessary in this variant. This coupling sleeve remains permanently on the welding point after removal of the heating sleeve 39
  • PBT polybutylene terephthalate
  • FIG. 7 now shows, also in longitudinal section, a coupling sleeve 40, which now, however, rests with its outer surface on the inner surfaces of the pipe ends 11 '. It also consists of a plastic injection-molded part, but in which, in addition to a sleeve-shaped concentric lining 38', is made of aluminum Steel ring is cast in as a heating sleeve 41.
  • An external support sleeve made of plastic not shown in FIG. 7, can advantageously consist of two interconnected half-shells, which can be removed and reused after the welding process.This process variant requires particularly little energy.A loss of energy due to radiation from the hot ones There are no metal parts in the air here

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  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A process for the production of weld seams for the connection of plastic parts, according to which the edges or ends of these plastic parts, optionally maintained in mutual abutment, are bridged by a holding section body which lies on both sides of the weld seam in the surface edge areas of the plastic parts. One or more inductively-heated metal body/bodies is/are connected with the named edge areas in such a way as to conduct heat, the outer edges of the holding section body being maintained at temperatures lower than the softening temperature of the plastic. With pipe connections, i.e. with closed welded seams, the holding section body is built as a coupling box (2, 2', 37, 40) which is applied to the outer or inner surfaces of the pipe ends (1, 1') that are to be welded together.

Description

Verfahren zum Herstellen von Schweißnähten an Kunststoffteilen, insbesondere Rohrschweißverfahren, Rohrleitungs-System mit Process for producing weld seams on plastic parts, in particular pipe welding processes, pipe system with

Rohrverbindungen hergestellt nach diesem Verfahren, sowie die Verwendung eines HF-Generators zur Durchführung dieses Verfahrens.Pipe connections made by this method, as well as the use of an HF generator to carry out this method.

Technisches GebietTechnical field

Die Erfindung betrifft ein Verfahren zum Herstellen von Schweißnahten an Kunststoffteilen, insbesondere Rohrschweißverfahren, bei dem die Zufuhr der Wärmeenergie zum Erhitzen der Schweißzone zumindest hauptsächlich aus einem erhitzten Metallkörper erfolgt Die Erfindung betrifft ferner ein Rohrleitungssystem mit Rohrverbindungen hergestellt nach diesem Verfahren, sowie die Verwendung eines HF-Generators zur Durchführung dieses Verfahrens.The invention relates to a process for producing weld seams on plastic parts, in particular pipe welding processes, in which the supply of the thermal energy for heating the welding zone takes place at least mainly from a heated metal body. The invention further relates to a piping system with pipe connections produced by this process, and the use of an HF Generator to perform this procedure.

Stand der TechnikState of the art

Rohrschweißverfahren, die nach diesem Prinzip arbeiten, sind z. B. Elektromuffen-Schweißverfahren, bei denen der erhitzte Metallkörper aus einer elektrisch beheizten Heizwendel besteht und wie sie z. B. aus der EP 0689931 A2 bekannt sind. Der Materialaufwand ist bei diesen Verfahren aber relativ hoch.Pipe welding processes that work according to this principle are e.g. B. electric socket welding process in which the heated metal body consists of an electrically heated heating coil and how z. B. are known from EP 0689931 A2. The cost of materials in these processes is relatively high.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art anzugeben, das allgemein und nicht nur zum Rohrschweißen verwendbar ist und das, was das Rohrschweißen betrifft, weniger aufwendig ist als ein Elektromuffen-Schweißverfahren. Dabei kann die Schweißperiode durch eine beschleunigte Abkühlung der Schweißzone nicht unwesentlich verkürzt werden.The invention is based on the object of specifying a method of the type mentioned which can be used in general and not only for pipe welding and which is less complex in terms of pipe welding than an electric socket welding method. The welding period can be shortened not insignificantly by accelerated cooling of the welding zone.

Das erfindungsgemäße Verfahren ist zunächst dadurch gekennzeichnet, daß die gegebenenfalls auf Stoß gehaltenen Ränder oder Enden der miteinander zu verschweißenden Teile von einem Halteprofilkörper überbrückt werden, der beiderseits der Schweißnaht an Oberflächen-Randbereiche dieser Teile anliegt, daß der zu erhitzende Metallkörper induktiv erhitzt wird, während er mit den genannten Oberflachen-Randbereichen entweder direkt oder über den Halteprofilkörper in Wärmeleitverbindung steht, wobei die beiden Außenränder des Halteprofilkörpers, die mit den Oberflächen-Randbereichen in Wärmeleitkontakt stehen, auf Temperaturen gehalten werden, die niedriger sind als die Erweichungstemperatur des Kunststoffes. Dabei ist bei Rohrverbindungen, bei denen die Schweißnaht in sich geschlossen ist, der Halteprofilkörper als Kupplungsmuffe ausgebildet, die an den Außen- oder Innenoberflachen der miteinander zu verschweißenden Rohrenden anliegt. Ein Rohrschweißverfahren, bei dem die Rohrteile durch Verschweißen verbunden werden und bei dem die Wärmezufuhr durch Erhitzung in einem HF-Feld erfolgt, ist z B aus der DPS 802282 bekannt Bei diesem Verfahren werden zwei ineinander gesteckte Rohrenden miteinander verschweißt In der ringförmigen Schweißfuge sind Metallteile, beispielsweise Metallfolien angeordnet, in denen im HF- Feld Strome induziert werden, welche zur Erhitzung der Schweißzone fuhren Dieses Verfahren das zu keiner homogenen Schweißzone fuhrt, hat aber in der Praxis keinen Eingang gefundenThe method according to the invention is first characterized in that the edges or ends of the parts to be welded, which may be held in abutment, are bridged by a holding profile body which bears on both sides of the weld seam on surface edge regions of these parts, that the metal body to be heated is inductively heated while he is in thermal conduction with said surface edge areas either directly or via the holding profile body, the two outer edges of the holding profile body, which are in thermal conduction contact with the surface edge areas, being kept at temperatures which are lower than the softening temperature of the plastic. In the case of pipe connections in which the weld seam is self-contained, the holding profile body is designed as a coupling sleeve which bears on the outer or inner surfaces of the pipe ends to be welded to one another. A pipe welding process in which the pipe parts are connected by welding and in which the heat is supplied by heating in an HF field is known, for example, from DPS 802282. In this process, two pipe ends which are inserted into one another are welded to one another. For example, metal foils are arranged in which currents are induced in the HF field, which lead to the heating of the welding zone. This method, which does not lead to a homogeneous welding zone, has not been used in practice

Gemäß einer vorteilhaften Ausbildung der Erfindung werden die genannten Außenränder des Halteprofilkorpers durch Kuhlprofilabschnitte oder Kuhlkörper, die überschüssige Wärmemengen aufnehmen gekühltAccording to an advantageous embodiment of the invention, said outer edges of the holding profile body are cooled by cooling profile sections or cooling bodies which absorb excess amounts of heat

Nach einer anderen vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens bestehen die eingesetzten Kupplungsmuffen zumindest an ihren Endberetchen aus einem Mateπal niedriger thermischer Leitfähigkeit vorzugsweise aus KunststoffAccording to another advantageous embodiment of the method according to the invention, the coupling sleeves used consist, at least at their end areas, of a material with low thermal conductivity, preferably plastic

In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist an der der Kupplungsmuffe mit Bezug auf die Rohrenden gegenüberliegenden Seite eine an die Rohrendeninnen - bzw -außenoberflachen anliegende Stutzvorrichtung, vorteilhaft eine Stutzmuffe, vorgesehenIn a further advantageous embodiment of the invention, a support device, advantageously a support sleeve, is provided on the side opposite the coupling sleeve with respect to the pipe ends, and is advantageously in contact with the inner or outer pipe end surfaces

Gemäß noch einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens ist die emgesetze Kupplungsmuffe teilbar ausgebildet und wird nach dem Schweißvorgang zwecks Wiederverwendung entferntAccording to yet another advantageous embodiment of the method according to the invention, the inserted coupling sleeve is designed to be divisible and is removed for reuse after the welding process

Nach einer anderen vorteilhaften Ausgestaltung der Erfindung wird an der Stelle der Schweißnaht zwischen dem Halteprofilkörper und den Oberflachen-Randbereichen der miteinander zu verschweißenden Teile ein Profilkörper aus dem Schweißkunststoff angeordnet, der sich beim Schweißvorgang mit den zu verschweißenden Teilen verbindet Dieser Profilkörper ist bei Rohrverbindungen als Muffe ausgebildetAccording to another advantageous embodiment of the invention, a profile body made of the welding plastic is arranged at the location of the weld between the holding profile body and the surface edge regions of the parts to be welded to one another, which connects to the parts to be welded during the welding process. This profile body is a socket in pipe connections educated

Gemäß einer letzten vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens wird wahrend des Schweißvorganges ein zwischen den zu verschweißenden Körpern bestehender Spalt durch ein Dichtungsmateπal insbesondere durch einen Dichtungsprofilkörper abgedichtetAccording to a last advantageous embodiment of the method according to the invention, a gap existing between the bodies to be welded is sealed by a sealing material, in particular by a sealing profile body, during the welding process

Kurze Beschreibung der Erfindung anhand der ZeichnungenBrief description of the invention with reference to the drawings

Einzelne bevorzugte Varianten der Erfindung werden nachstehend anhand von Beispielen und der Figuren eingehend erläutert Die anhand der Figuren 1 und 2 beschriebene Verfahrensvariante zeigt ein Rohrschweißverfahren, das sich durch einen besonders niedrigen Materialaufwand auszeichnet Die Figuren 1 und 2 zeigen im Längs- bzw Querschnitt, längs den Linien ll-ll bzw I-l, die Anordnung zum miteinander Verschweißen zweier Rohre aus thermoplastischem Kunststoff Außen- und Innendurchmesser der Rohrenden 1 ,1 ' werden durch mechanische Bearbeitung auf vorgegebene Durchmesser kalibriert Die verwendete Kupplungsmuffe 2 ist ein Teil der Schweißvorrichtung Sie besteht aus zwei Halbschalen 3,3' eines Gußteils aus Aluminium oder eines anderen nicht ferromagnetischen Metalls, die entlang der mit 4 angedeuteten Trennebene zusammengehalten werden und als Gesamt-Muffe eine im wesentlichen rotationssymmetrische Form haben Die Kupplungsmuffe 2 weist in der Mitte, an der Schweißstelle, eine Verdickung 5 auf, an welche zu beiden Seiten zwei rohrförmige Abschnitte 6,6' mit geringer Wandstarke anschließen, welche ihrerseits an den Enden in zwei Kuhlköpfe 7,7' übergehen Die beiden Halbschalen 3,3' werden durch zwei Stifte 8,8' und zwei in Ringnuten der Kuhlköpfe 7,7' liegende, ringförmig geschlossene Spiralfedern 9,9' in genau definierter Lage zueinander gehalten Auf die zwei Halbschalen der Verdickung 5 sind jeweils die Halbschalen einer im ganzen rohrstuckformigen Heizmuffe 10 aus Stahl aufgeschraubtIndividual preferred variants of the invention are explained in detail below using examples and the figures The process variant described with reference to FIGS. 1 and 2 shows a pipe welding process which is characterized by a particularly low material expenditure. FIGS. 1 and 2 show the arrangement for welding two pipes together in the longitudinal or cross-section, along the lines II-II or II The outer and inner diameters of the pipe ends 1, 1 'are calibrated to the specified diameter by mechanical processing. The coupling sleeve 2 used is part of the welding device. It consists of two half-shells 3, 3' of a cast part made of aluminum or another non-ferromagnetic metal are held together along the parting line indicated by 4 and as an overall sleeve have an essentially rotationally symmetrical shape. The coupling sleeve 2 has a thickening 5 in the middle, at the welding point, to which two tubular sections 6, 6 'with a lesser amount on both sides Wall strong connect which of their at the ends merge into two cooling heads 7,7 '. The two half-shells 3,3' are closed in a precisely defined position by two pins 8,8 'and two annular springs 9,9' in ring grooves of the cooling heads 7,7 ' held to each other The half-shells of an overall tubular heating sleeve 10 made of steel are screwed onto the two half-shells of the thickening 5

Zur Vorbereitung der Verschweißung wird die Kupplungsmuffe 2 über die beiden Rohrenden 1,1' geschoben Gleichzeitig wird innerhalb der Rohrenden 1 ,1' eine an die Rohrenden-Innenoberflächen anliegende und diese überbrückende Stutzmuffe 11 angeordnet, die bei dem gegebenen Beispiel aus einem Spπtzgußteil aus hochschmelzendem Kunststoff besteht Fur den Schweißvorgang werden die Rohrenden 1,1 ' dann mittels einer in den Figuren nicht gezeigten Vorrichtung im Sinne der Pfeile 12,12' gegeneinander gedrucktTo prepare for the welding, the coupling sleeve 2 is pushed over the two pipe ends 1, 1 '. At the same time, a pipe sleeve 11, which lies against the inner surfaces of the pipe ends and bridges them, is arranged within the pipe ends 1, 1' and, in the given example, is made of a high-melting point casting Plastic consists. For the welding process, the pipe ends 1, 1 'are then pressed against one another by means of a device, not shown in the figures, in the direction of the arrows 12, 12'

Das bei dem Verfahren verwendete Heizaggregat besteht aus dem Oszillatorteil 13 eines HF- Generators, an dessen elektrischen Ausgang ein aus Kupferrohren gebogener, wassergekühlter Induktor angeschlossen ist Der Induktor weist ein Schutzgehäuse 14 aus einem faserverstärktem Duroplast auf, welches mit Positionierschlitzen 15 versehen ist und besteht aus zwei längs parallelen Ebenen angeordneten, spiralförmig gewickelten Platteninduktoren 16The heating unit used in the method consists of the oscillator part 13 of an HF generator, to the electrical output of which a water-cooled inductor bent from copper pipes is connected. The inductor has a protective housing 14 made of a fiber-reinforced thermoset, which is provided with positioning slots 15 and consists of two longitudinally parallel planes, spirally wound plate inductors 16

Für den Schweißvorgang wird nun das Heizaggregat über der Kupplungsmuffe 2 in Position gebracht, derart, daß die Ebenen der Platteninduktoren 16 und die Trennebene 4 der Kupplungsmuffen-Halften zueinander parallel sind Dazu dienen an den Kuhlköpfen 7,7' vorgesehene Fuhrungskanten 17, längs denen das Schutzgehause 14 aufgeschoben wirdFor the welding process, the heating unit is now positioned over the coupling sleeve 2 such that the planes of the plate inductors 16 and the parting plane 4 of the coupling sleeve halves are parallel to one another. For this purpose, guide edges 17 are provided on the cooling heads 7, 7 ', along which the Protective housing 14 is pushed on

Der HF-Generator, der z B mit einer Frequenz im Bereich von 75 - 175 kHz arbeitet, wird nun eingeschaltet Dabei werden hauptsächlich in den Hälften der Heizmuffe 10 Ströme induziert, welche innerhalb von wenigen Sekunden diese auf Temperaturen aufheizen, die um etwa 100 - 200 °C höher als die Schmelztemperatur des Rohrkunststoffs liegen Während der Heizperiode, d. h. bei eingeschaltetem HF-Generator, fließt ständig Wärme aus den Heizmuffen-Hälften in die Kupplungsmuffe 2 ein und dringt dabei zu einem großen Teil in die beiden Rohrenden 1 ,1' ein. Ein anderer Teil fließt innerhalb der Kupplungsmuffe 2 in Richtung auf die beiden Kühlköpfe 7,7' ab. Volumen und Form der beiden Kühlköpfe 7,7' sind dabei so gewählt, daß sie während der Heizperiode unter der Erweichungstemperatur des Rohrmaterials bleiben.The HF generator, which works with a frequency in the range of 75 - 175 kHz, for example, is now switched on. 10 currents are mainly induced in the halves of the heating sleeve, which within a few seconds heat them up to temperatures that are around 100 - 200 ° C higher than the melting temperature of the tubular plastic During the heating period, ie when the HF generator is switched on, heat flows continuously from the heating sleeve halves into the coupling sleeve 2 and thereby largely penetrates into the two pipe ends 1, 1 '. Another part flows out within the coupling sleeve 2 in the direction of the two cooling heads 7, 7 '. The volume and shape of the two cooling heads 7, 7 'are selected so that they remain below the softening temperature of the tube material during the heating period.

Am Ende der Heizperiode kann das Heizaggregat sofort abgezogen werden. Das Rohrmaterial ist zu diesem Zeitpunkt in einem Volumsbereich, dessen innere Begrenzung durch die strichlierte Linie 18 angedeutet ist, aufgeschmolzen. Nach Beendigung der Heizperiode findet über die Masse der Kupplungsmuffe 2 ein rascher Temperaturausgleich statt, wobei die Ausgleichstemperatur wegen der überwiegenden Wärmespeicherkapazität der Kühlköpfe 7,7' ebenfalls unter der Erweichungstemperatur des Rohrmaterials bleibt. Die Kupplungsmuffe 2 dient nun zur Kühlung des aufgeschmolzenen Rohrmaterials und bewirkt so eine beschleunigte Abkühlung der Schweißzone. Danach wird die Kupplungsmuffe 2 von der Schweißzone abgenommen. Die Verschweißung ist so vollkommen, daß die ursprüngliche Fuge zwischen den Rohrenden 1,1' nicht mehr zu erkennen ist.At the end of the heating season, the heating unit can be removed immediately. At this point in time, the tube material has melted in a volume region, the inner boundary of which is indicated by the dashed line 18. After the end of the heating period, rapid temperature compensation takes place via the mass of the coupling sleeve 2, the compensation temperature also remaining below the softening temperature of the pipe material because of the predominant heat storage capacity of the cooling heads 7, 7 '. The coupling sleeve 2 now serves to cool the melted pipe material and thus causes the welding zone to cool down more quickly. The coupling sleeve 2 is then removed from the welding zone. The welding is so perfect that the original joint between the pipe ends 1, 1 'can no longer be seen.

Anstelle einer innerhalb der Rohrenden 1 ,1' angebrachten Stützmuffe 11 kann auch ein in das Rohrsystem an der Stelle der Verschweißung angebrachter, auf einem Überdruck von 1 - 3 bar gehaltenen Balg als Stützvorrichtung dienen, der nach dem Schweißvorgang vom Druck entlastet und aus dem Rohrsystem herausgezogen wird. Ein derartiger Balg ist aus der EP 0689931 A2 bekannt.Instead of a support sleeve 11 attached within the pipe ends 1, 1 ', a bellows attached to the pipe system at the location of the weld and held at an excess pressure of 1-3 bar can also serve as a support device, which relieves the pressure after the welding process and leaves the pipe system is pulled out. Such a bellows is known from EP 0689931 A2.

Bei den meisten bekannten Muffenschweißverfahren erfolgt die Verbindung der Rohrenden nicht über die Stärke der Rohrwand, sondern über die Kunststoffmuffe. Eine Stützvorrichtung wie z. B. ein Balg ist bei diesen Verfahren nicht erforderlich.In most known socket welding methods, the pipe ends are not connected via the thickness of the pipe wall, but via the plastic socket. A support device such. B. a bellows is not required in these processes.

In Abänderung des anhand der Figuren 1 und 2 beschriebenen Verfahrens sei nun eine Verfahrensvariante beschrieben, bei der ebenfalls keine Stützvorrichtung erforderlich ist und die besonders auch zum Verbinden von Rohren aus hochkristallinen Kunststoffen mit geringer Schmelzviskosität geeignet ist. Fig. 3 zeigt in einer Teildarstellung im Längsschnitt die beiden Rohrenden 1,1' zwischen denen eine Muffe 19 aus Rohrkunststoff angeordnet ist, gegen deren ringförmige Rippe 20 die Rohrenden 1 ,1' gestoßen werden. Innerhalb der Rippe 20 ist noch ein Dichtungsring 21 aus Silikon-Gummi vorgesehen. Nach Einfügen von Muffe 19 und Dichtungsring 21 wird die geteilte Kupplungsmuffe 2' montiert und die Rohrenden 1 ,1' in Richtung der Pfeile 12,12' gegeneinander gedrückt.In a modification of the method described with reference to FIGS. 1 and 2, a method variant will now be described in which no support device is also required and which is also particularly suitable for connecting tubes made of highly crystalline plastics with low melt viscosity. Fig. 3 shows a partial view in longitudinal section of the two pipe ends 1, 1 'between which a sleeve 19 made of tubular plastic is arranged, against the annular rib 20 of which the pipe ends 1, 1' are pushed. A sealing ring 21 made of silicone rubber is also provided within the rib 20. After inserting the sleeve 19 and the sealing ring 21, the split coupling sleeve 2 'is mounted and the pipe ends 1, 1' are pressed against one another in the direction of the arrows 12, 12 '.

Beim Heizvorgang werden Bereiche der Muffe 19 und der Rohrenden 1 ,1', die sich außerhalb des durch die strichlierte Linie 22 angedeuteten Bereichs befinden, aufgeschmolzen. Die kleinen Hohlräume 23,23' an den Enden der Muffe 19 werden dabei ausgefüllt. Ein Ausfließen des aufgeschmolzenen Kunststoffes wird einerseits durch die Kupplungsmuffe 2' und andererseits durch den Dichtungsring 21 verhindertDuring the heating process, areas of the sleeve 19 and the pipe ends 1, 1 ', which are outside the area indicated by the broken line 22, are melted. The small cavities 23, 23 'at the ends of the sleeve 19 are filled. An outflow of the melted plastic is prevented on the one hand by the coupling sleeve 2 'and on the other hand by the sealing ring 21

Beim Verschweißen von Rohren aus PP (Polypropylen) mit 20 mm Außendurchmesser und einer Wandstärke von 2,5 mm wurde mit folgenden Betriebsdaten gearbeitet Die Heizmuffe 10 aus Baustahl, die ein Gewicht von 28 g hatte, wurde mit einer Frequenz von 162 kHz während 20 s mit einer Induktorleistung von 900 W auf 300 °C aufgeheizt Die Wandstarke der Abschnitte 6,6' der Kupplungsmuffe 2 betrug 0,5 mm, die Kuhlkopfe 7,7' aus Aluminium hatten ein Gesamtgewicht von 165 gWhen welding pipes made of PP (polypropylene) with an outer diameter of 20 mm and a wall thickness of 2.5 mm, the following operating data were used: The heating sleeve 10 made of structural steel, which had a weight of 28 g, was operated at a frequency of 162 kHz for 20 s heated to 300 ° C with an inductor power of 900 W. The wall thickness of sections 6.6 'of coupling sleeve 2 was 0.5 mm, the cooling heads 7.7' made of aluminum had a total weight of 165 g

Das erfindungsgemäße Verfahren kann nun nicht nur zum Rohrschweißen, sondern ganz allgemein zum Herstellen von Schweißnähten zum Verbinden von z B plattenformigen Kunststoffteilen verwendet werden Eine solche Verfahrensvariante sei nun anhand der Figuren 4 und 5 erläutert, die im Quer- bzw in einem Längsschnitt längs den Linien V bzw IV eine entsprechende Anordnung zeigenThe method according to the invention can now be used not only for tube welding, but very generally for producing weld seams for connecting, for example, plate-shaped plastic parts. Such a variant of the method will now be explained with reference to FIGS. 4 and 5, which are shown in cross-section or in a longitudinal section along the lines V and IV show a corresponding arrangement

Zwei Platten 24,24' sollen an der Stelle 25 miteinander verschweißt werden Längs der Schweißnaht (die in Fig 4 senkrecht zur Zeichnungsebene verläuft) wird ein die Ränder der zu verschweißenden Platten 24,24' bedeckender Halteprofilkörper angebracht, der aus einer Aluminiumfolie 26 und dem eigentlichen Halteprofilkörper 27 besteht Der Halteprofilkörper 27 ist ein Aluminium-Profilkorper mit einer Verdickung 28 in der Mitte, an die zwei dünnwandige Abschnitte 29 anschließen, welche in zwei Kuhlprofilabschnitte 30 übergehen Der Halteprofilkörper 27 ist quer zu seiner Längserstreckung durch Schlitze 31 unterteilt die einen Wärmefluß in Richtung der Profillängserstreckung behindern Auf den Abschnitten der Verdickung 28 sind jeweils Heizkörper 32 in Form von Stahlplatten befestigtTwo plates 24, 24 'are to be welded together at the point 25. Along the weld seam (which runs perpendicular to the plane of the drawing in FIG. 4), a holding profile body covering the edges of the plates 24, 24' to be welded is attached, which consists of an aluminum foil 26 and the actual support profile body 27 is the support profile body 27 is an aluminum profile body with a thickening 28 in the middle, to which two thin-walled sections 29 connect, which merge into two cooling profile sections 30. The support profile body 27 is divided transversely to its longitudinal extension by slots 31 which a heat flow in Interfering with the direction of the longitudinal extension of the profile. Radiators 32 in the form of steel plates are each fastened to the sections of the thickening 28

Zum Aufheizen der Heizkörper dient ein mit einem Induktor 33 versehener Oszillatorteil 34 eines HF- Generators Der Induktor 33, der einen ähnlichen Aufbau hat wie anhand von Fig 1 beschrieben, ist über dem Heizkörper 32 angeordnet Fur den Heizvorgang wird der HF-Generator eingeschaltet und der Oszillatorteil 34 mit dem Induktor 33 längs dem Halteprofilkörper 27 in Richtung des Pfeiles 35 bewegt Die dabei in den Heizkörpern 32 erzeugte Wärme fließt, analog wie bei den vorstehend beschriebenen Rohrschweißverfahren, zu einem überwiegenden Teil in die Schweißregion ein und schmilzt dort den Kunststoff in einer durch die strichlierte Linie 36 begrenzten Region auf Fur jede bestimmte Stelle der Schweißnaht ist die Heizperiode nach dem Weiterfahren des Induktors 33 beendet Die zurückgebliebenen Abschnitte des Halteprofilkörpers 27 bewirken dann eine beschleunigte Abkühlung der Schweißzone Diese Verfahrensvariante ist auch besonders vorteilhaft zum Verbinden von Rohren größeren Durchmessers geeignet Der Halteprofilkörper wird dabei zu einem Reifen gebogen und über die Stelle der zu bildenden Schweißnaht gespannt Der Induktor kann hier stationär angeordnet und die beiden miteinander zu verschweißenden Rohre relativ zum Induktor gedreht werdenAn oscillator part 34 of an HF generator, which is provided with an inductor 33, is used to heat the radiators. The inductor 33, which has a structure similar to that described with reference to FIG. 1, is arranged above the radiator 32. The HF generator is switched on for the heating process and the Oscillator part 34 with the inductor 33 moves along the holding profile body 27 in the direction of arrow 35. The heat generated in the radiators 32 flows, analogously to the tube welding methods described above, to a large extent into the welding region and melts the plastic there in one the dashed line 36 delimited region to the heating period is ended after the inductor 33 has moved on for each specific location of the weld seam. The remaining portions of the holding profile body 27 then bring about an accelerated cooling of the welding zone suitable diameter The holding profile body is bent into a tire and stretched over the location of the weld seam to be formed. The inductor can here stationary and the two pipes to be welded together are rotated relative to the inductor

Eine der Funktionen der Kupplungsmuffe bzw des Halteprofilkörpers ist, für das Material eine feste räumliche Begrenzung zu bilden und außerdem bei Rohrschweißverfahren die beiden Rohrenden achsial fluchtend zu halten Deshalb ist es eine wichtige Voraussetzung fur das Funktionieren des Verfahrens, daß die Enden der Kupplungsmuffe bzw die Außenränder des Halteprofilkörpers auf Temperaturen gehalten werden, die unterhalb der Erweichungstemperatur des Schweißkunststoffs liegen Bei den vorstehend beschriebenen Verfahrensvarianten wird dies durch die Kuhlköpfe bzw Kuhlprofilabschnitte erreichtOne of the functions of the coupling sleeve or the holding profile body is to form a fixed spatial limitation for the material and also to keep the two pipe ends axially aligned in pipe welding processes.Therefore, it is an important prerequisite for the functioning of the process that the ends of the coupling sleeve or the outer edges of the holding profile body are kept at temperatures which are below the softening temperature of the welding plastic. In the process variants described above, this is achieved by the cooling heads or cooling profile sections

Gemäß der nun anhand der Figuren 6 und 7 beschriebenen Verfahrensvarianten wird ein anderer Weg beschritten Hier wird bei Rohrschweißverfahren eine Kupplungsmuffe eingesetzt, die zumindest in ihren Endbereichen aus einem Material geringer thermischer Leitfähigkeit bestehtAccording to the process variants now described with reference to FIGS. 6 and 7, a different route is followed. Here, a coupling sleeve is used in pipe welding processes, which consists at least in its end regions of a material of low thermal conductivity

Figur 6 zeigt im Längsschnitt eine solche Kupplungsmuffe 37 Sie besteht aus einem Kunststoff- Spntzgußteil, z B aus glasfaserverstärktem PBT (Polybutylenterephthalat), in dem ein Wärme- Konzentπerfutter 38 in Form einer Aluminiumbuchse integriert ist Die Innenoberflache des Konzentrierfutters 38 steht dabei in Wärmeleitverbindung mit den Außenoberflächen der Rohrenden 1 ,1' Auf der Konzentrierfutter - Außenoberfläche wird eine aus zwei Halbschalen aus Stahl bestehende Heizmuffe 39 befestigt Die Kuhlkörper sind bei dieser Variante entbehrlich Diese Kupplungsmuffe verbleibt nach Abnahme der Heizmuffe 39 fur standig auf der SchweißstelleFIG. 6 shows such a coupling sleeve 37 in longitudinal section. It consists of a plastic molded casting, for example of glass fiber reinforced PBT (polybutylene terephthalate), in which a heat concentrating lining 38 in the form of an aluminum bushing is integrated Outer surfaces of the pipe ends 1, 1 'A heating sleeve 39 consisting of two half-shells made of steel is fastened to the concentrating chuck outer surface. The cooling bodies are unnecessary in this variant. This coupling sleeve remains permanently on the welding point after removal of the heating sleeve 39

Figur 7 zeigt nun, ebenfalls im Längsschnitt, eine Kupplungsmuffe 40, die nun aber mit ihrer Außenoberfläche an den Innenoberflächen der Rohrenden 1 1' anliegt Sie besteht ebenfalls aus einem Kunststoff-Spritzgußteil, in den nun aber neben einem muffenformigen Konzentπerfutter 38' aus Aluminium ein Stahlring als Heizmuffe 41 eingegossen ist Eine in der Figur 7 nicht dargestellte, außenliegende Stutzmuffe aus Kunststoff kann hier vorteilhaft aus zwei miteinander verbundenen Halbschalen bestehen, die nach dem Schweißvorgang abgenommen und wiederverwendet werden können Diese Verfahrensvariante benötigt besonders wenig Energie Ein Energieverlust durch Abstrahlung von den heißen Metallteilen an die Luft ist hier nicht gegeben Figure 7 now shows, also in longitudinal section, a coupling sleeve 40, which now, however, rests with its outer surface on the inner surfaces of the pipe ends 11 '. It also consists of a plastic injection-molded part, but in which, in addition to a sleeve-shaped concentric lining 38', is made of aluminum Steel ring is cast in as a heating sleeve 41. An external support sleeve made of plastic, not shown in FIG. 7, can advantageously consist of two interconnected half-shells, which can be removed and reused after the welding process.This process variant requires particularly little energy.A loss of energy due to radiation from the hot ones There are no metal parts in the air here

Claims

Patentansprüche: Claims: 1 Verfahren zum Herstellen von Schweißnähten an Kunststoffteilen, bei dem die Zufuhr der Wärmeenergie zum Erhitzen der Schweißzone zumindest hauptsächlich aus einem erhitzten Metallkörper erfolgt, dadurch gekennzeichnet, daß die gegebenenfalls auf Stoß gehaltenen Rander oder Enden der miteinander zu verschweißenden Teile von einem Halteprofilkörper überbrückt werden, der beiderseits der Schweißnaht an Oberflächen- Randbereichen dieser Teile anliegt, daß der zu erhitzende Metallkörper induktiv erhitzt wird, während er mit den genannten Oberflachen- Randbereichen entweder direkt oder über den Halteprofilkörper in Wärmeleitverbindung steht, wobei die beiden Außenrander des Halteprofilkörpers, die mit den Oberflächen-Randbereichen in Wärmeleitkontakt stehen, auf Temperaturen gehalten werden, die niedriger sind als die Erweichungstemperatur des Kunststoffes1 process for the production of weld seams on plastic parts, in which the supply of the thermal energy for heating the welding zone takes place at least mainly from a heated metal body, characterized in that the edges or ends of the parts to be welded, which may be held together, are bridged by a holding profile body, which is on both sides of the weld on the surface edge areas of these parts, that the metal body to be heated is heated inductively, while it is in thermal contact with said surface edge areas either directly or via the holding profile body, the two outer edges of the holding profile body, which are connected to the surfaces - Edge areas are in thermal contact, are kept at temperatures that are lower than the softening temperature of the plastic 2 Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß bei Rohrverbindungen, bei denen die Schweißnaht in sich geschlossen ist, der Halteprofilkörper als Kupplungsmuffe (2,2', 37, 40) ausgebildet ist, die an den Außen- oder Innenoberflachen der miteinander zu verschweißenden Rohrenden (1 ,1 ') anliegt2 The method according to claim 1, characterized in that for pipe connections in which the weld seam is closed, the holding profile body is designed as a coupling sleeve (2,2 ', 37, 40) which on the outer or inner surfaces of the to be welded together Pipe ends (1, 1 ') 3 Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die genannten Außenränder des Halteprofilkörpers durch Kuhlprofilabschnitte (30) oder Kühlkörper (7,7'), die überschüssige Wärmeenergie aufnehmen, gekühlt werden3 The method according to claim 1, characterized in that said outer edges of the holding profile body by cooling profile sections (30) or cooling body (7,7 '), which absorb excess thermal energy, are cooled 4 Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die eingesetzten Kupplungsmuffen (37, 40) zumindest an ihren Endbereichen aus einem Material niedriger thermischer Leitfähigkeit bestehen4 The method according to claim 2, characterized in that the coupling sleeves (37, 40) used consist of a material of low thermal conductivity at least at their end regions 5 Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Kupplungsmuffen-Endbereiche aus Kunststoff bestehen5 The method according to claim 4, characterized in that the coupling sleeve end regions consist of plastic 6 Verfahren nach Anspruch 2, dadurch gekennzeichnet.daß an der der Kupplungsmuffe (2,2', 37, 40) mit Bezug auf die Rohrenden (1 ,1') gegenüberliegenden Seite eine an die Rohrendenmnen- bzw - außenoberflächen anliegende Stuzvorπchtung vorgesehen ist6. The method according to claim 2, characterized in that on the side opposite the coupling sleeve (2, 2 ', 37, 40) with respect to the pipe ends (1, 1') there is provided a support device which rests on the pipe end or outer surfaces 7 Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Stutzvorrichtung aus einer Stützmuffe (11) besteht7 The method according to claim 6, characterized in that the support device consists of a support sleeve (11) 8 Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die eingesetzte Kupplungsmuffe (2,2') teilbar ausgebildet ist und nach dem Schweißvorgang zwecks Wiederverwendung entfernt wird 9 Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß anstelle der Schweißnaht, zwischen dem Halteprofilkörper und den Oberflächen-Randbereichen der miteinander zu verschweißenden Teile, ein Profilkörper aus dem Schweißkunststoff angeordnet wird, der sich beim Schweißvorgang mit den zu verschweißenden Teilen verbindet8. The method according to claim 1, characterized in that the coupling sleeve (2,2 ') used is designed to be divisible and is removed after the welding process for reuse 9. The method according to claim 1, characterized in that instead of the weld seam, between the holding profile body and the surface edge regions of the parts to be welded together, a profile body made of the welding plastic is arranged, which connects during the welding process with the parts to be welded 10 Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß bei Rohrverschweißungen der Profilkörper eine Muffe (19) bildet10 The method according to claim 9, characterized in that the tube body forms a sleeve (19) for pipe welding 11 Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß zumindest während des Schweißvorganges ein zwischen den miteinander zu verschweißenden Korpern bestehender Spalt durch ein Dichtungsmateπal insbesondere einen Dichtungsprofilkörper abgedichtet wird11. The method according to claim 1, characterized in that at least during the welding process, an existing gap between the bodies to be welded together is sealed by a sealing material, in particular a sealing profile body 12 Rohrleitungssystem, dadurch gekennzeichnet daß es Rohrverbindungen aufweist, die nach einem Verfahren gemäß einem der Ansprüche 1 bis 11 hergestellt wurden12 piping system, characterized in that it has pipe connections which were produced by a method according to any one of claims 1 to 11 13 Verwendung eines HF-Generators mit Induktor, dadurch gekennzeichnet, daß er in einem Verfahren gemäß einem der Ansprüche 1 bis 11 verwendet wird 13 Use of an HF generator with an inductor, characterized in that it is used in a method according to one of claims 1 to 11
PCT/AT1997/000023 1996-02-09 1997-02-10 Process for the production of weld seams on plastic parts, especially a pipe-welding process, pipeline system with pipe connections produced according to this process as well as the use of an hf generator for the carrying out of this process Ceased WO1997028951A1 (en)

Applications Claiming Priority (6)

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AT23496 1996-02-09
ATA234/96 1996-02-09
ATA1353/96 1996-07-29
AT135396 1996-07-29
ATA76/97 1997-01-20
AT7697 1997-01-20

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EP1174248A3 (en) * 2000-07-20 2002-04-10 Georg Fischer Rohrleitungssysteme AG Welding apparatus with heating element
RU2430297C1 (en) * 2010-01-11 2011-09-27 Федеральное агентство по рыболовству, федеральное государственное образовательное учреждение высшего профессионального образования Астраханский государственный технический университет Device for control of corrosion rate and condition of welding seams of pipeline for oil-gas-chemical products
WO2013115678A1 (en) * 2012-01-31 2013-08-08 Общество С Ограниченной Ответственностью "Альтерпласт" Method and assembly for connecting a pipe to a coupling element

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Publication number Priority date Publication date Assignee Title
EP1174248A3 (en) * 2000-07-20 2002-04-10 Georg Fischer Rohrleitungssysteme AG Welding apparatus with heating element
RU2430297C1 (en) * 2010-01-11 2011-09-27 Федеральное агентство по рыболовству, федеральное государственное образовательное учреждение высшего профессионального образования Астраханский государственный технический университет Device for control of corrosion rate and condition of welding seams of pipeline for oil-gas-chemical products
WO2013115678A1 (en) * 2012-01-31 2013-08-08 Общество С Ограниченной Ответственностью "Альтерпласт" Method and assembly for connecting a pipe to a coupling element

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