KR20170103360A - Electro-fusion apparatus for transfer tube of fluid including chemical material - Google Patents

Abstract

According to an embodiment of the present invention, since the fused protrusions are fusion-bonded to the ends of the pipes three-dimensionally, the fins are prevented from being exposed to the outside Thus, it is possible to prevent the coating of the heating wire from being corroded by the chemical in the environment where the chemical substance is used, and also to prevent the leakage of the chemical substance to the outside through the heating wire.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electro-

TECHNICAL FIELD The present invention relates to an electric welding apparatus for a transfer tube for a fluid including a chemical substance for connecting a chemical material pipe, a gas pipe, a water pipe, or a synthetic pipe used for other purposes.

In order to obtain a perfect airtightness in joining a pipe made of a material such as a polyethylene pipe or a polypropylene which is used for a gas pipe, a water pipe or other purposes, a heat fusion method has been basically used.

Conventional heat welding methods include Butt Fusion Welding, Heat Fusion Socket Welding, and Electro Fusion Socket Welding.

The butt fusion method is a so-called butt welding method in which different pipe cross sections and cross sections are butted against each other without using a separate connection socket to join the pipes to each other, The surface to be melt-bonded is subjected to a surface treatment, the hot plate is placed therebetween, and the pipe joining section is pressurized and adhered by hydraulic pressure or pneumatic pressure so that a suitable melting temperature (for example, the polyethylene material is around 210 ° C ), The hot plate is quickly removed, the both ends of the molten different pipes are pressed and adhered to each other, and after a certain period of time is maintained, they are cooled and solidified.

This method dissolves and adheres the pipe base material when joining different pipes, but it does not require a separate connection socket, but it is inconvenient to transport the heat fusion machine to the work site and the structure of the heat fusion machine is complicated and difficult to use have.

Next, in order to melt the inner diameter surface of the connecting socket and the outer diameter surface of the pipe, the inner diameter surface of the connecting socket and the outer diameter surface of the pipe are fused with each other. When the heating is completed, the outer surface of the pipe is fastly inserted into the inner diameter surface of the connection socket and the inner surface of the connection socket is quickly inserted into the connection socket.

Next, the electric socket heat welding method is a method of inserting a heat source such as a heating coil into an electric connection socket formed by injection molding, inserting a pipe to be welded, The inner diameter surface of the socket and the outer diameter surface of the pipe are simultaneously melted and joined.

At this time, as the heating coil, a copper wire or a copper alloy wire or a nichrome wire which maintains a certain electric resistance is used.

As a typical method for manufacturing such an electric connection socket, a coated electric resistance wire is wound in a coil shape, an electrical connection terminal is connected to the end, and the thermoplastic resin is injected and integrated by inserting the electric connection terminal into the injection mold.

Currently, electrical connection sockets are preferred by users due to their simplicity of operation, and various techniques relating to the heating elements of such electrical connection sockets have been developed.

However, in the current electric connection socket, in order to obtain airtightness or watertightness in the case of fusion bonding, there should be no impurities on the surface to be fusion bonded. When impurities are present, the impurities act as a kind of boundary layer, The melts placed on the glass are not bonded to each other, so that the bonding efficiency is lowered.

In consideration of this point, the surface to be fusion bonded is cleaned before bonding by fusion bonding, but in the case of fine thin film type impurities, complete cleaning is difficult.

In addition, bonding by fusion bonding is basically an important factor in the work in the state of applying a proper pressure, but in the case of the butt fusion method, the fusion bonding portion is pressed and adhered, Hydraulic or pneumatic). In the case of electric fusion, since the heating element is inserted in the inner circumferential surface of the joint pipe, only the pressure due to the natural expansion due to melting can be used, and artificial pressurization can not be considered.

Also, in order to utilize the pressure due to the natural expansion, the error between the inner circumferential surface of the electric fusion welding pipe and the outer peripheral surface of the synthetic pipe inserted into the electric fusion welding pipe must be small.

For example, Korean Unexamined Patent Application Publication No. 10-2009-0130562 (published on Dec. 24, 2009) discloses a connecting pipe 10 having a cylindrical coupling socket 10 into which the ends of two pipes 18a and 18b to be connected are inserted, The outer side of the heating wire 12 disposed in the inside of the coupling socket 10 in the vicinity of the inner surface of the coupling tube socket 10 is embedded in the inner surface of the coupling tube socket 10, And a temperature sensor (20) is disposed on the outer circumferential surface of the synthetic resin tube.

However, the conventional electric fusion welding hose for a synthetic resin pipe as shown in FIG. 1 has a problem in that the heating wire 12 embedded in the inner surface of the joint pipe socket 10 continues to fuse the end of one pipe and the end of the other pipe Since the heating wire 12 between the two pipes is exposed to the outside even after the fusion bonding of the two pipes is finished, the coating of the heating wire 12 exposed to the outside in the environment where the chemical is used There is a problem that the chemical leaks or leaks to the outside through the heating wire 12 as it is corroded.

In other words, there is a problem in that an electric fusion welding diaphragm for a conventional synthetic resin pipe can not be used in an environment in which a chemical substance is used, and therefore, a new type of fusion welding machine is required to be developed.

Korean Patent Laid-Open No. 10-2009-0130562 (published on December 24, 2009)

Accordingly, the present invention has been made in view of the background described above, and it is an object of the present invention to provide a method and apparatus for preventing the heating wire between the pipes from being exposed to the outside as the fused protrusion is fused mutually three- And it is an object of the present invention to provide an electric welding apparatus for a fluid transportation pipe including a chemical substance that can prevent corrosion due to a chemical substance from leaking out or leaking through a heating wire.

Further, since the distal end of the pipe is inserted into the support groove of the stopper portion and fused mutually in a mutually confronting state with the fused protrusion, the heating wire integrally formed in the body is exposed to the fluid flowing therein and is chemically or electrically oxidized or altered The present invention also provides an electric welding apparatus for a transfer tube for a fluid including a chemical substance that can maintain a stable welding state and improve fusion welding workability, There is a purpose.

The objects of the present invention are not limited thereto, and other objects not mentioned may be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, according to an embodiment of the present invention, a first section is formed on one side of an inner circumferential surface of a first pipe to which an end of a first pipe is inserted and fused, and a second section in which an end of the second pipe is inserted and fused on the other side of the inner circumferential surface And a stopper portion protruding from the inner circumferential surface so as to define the first section and the second section along a circumferential direction; And a heating wire embedded in the inner peripheral surface of the first section and the second section and connected to an external power source through an electrical connection terminal formed in the main body. Equipment.

In the present invention, the stopper portion may have a circumferential direction at an outer corner of a radial direction of a surface facing one or both of the end portion of the first pipe or the end portion of the second pipe so as to be melted and fused as the heating wire is heated And a fused protrusion formed to protrude therefrom.

In the present invention, the stopper portion may include a support groove which is recessed at one side or both sides in the axial direction so that one or both of the end of the first pipe or the end of the second pipe is fitted and fused with the fused protrusion .

In the present invention, the stopper portion is formed in a streamlined shape with a convex surface facing the center of the body so as to reduce frictional resistance of the flowing fluid.

According to an embodiment of the present invention, the conventional electro-fusion type is a structure that can not be used for transferring chemicals since the heating wire is exposed to the outside and is corroded by a chemical substance. However, according to the present invention, So that it is possible to prevent the coating of the heating wire from being corroded by the chemical substance in the environment where the chemical substance is used and also to prevent the chemical substance from interfering with the heating wire It is possible to prevent leaks or leaks from being leaked to the outside.

Further, since the distal end of the pipe is inserted into the support groove of the stopper portion and fused mutually in a mutually confronting state with the fused protrusion, the heating wire integrally formed in the body is exposed to the fluid flowing therein and is chemically or electrically oxidized or altered It is possible to maintain a firm fusion state so that the fusion workability can be improved and the joining state of the pipe can be made stronger.

1 is a perspective view showing an electric fusion mechanism for a conveying pipe of a conventional fluid,
FIG. 2 is a perspective view of an electric welding apparatus for a fluid containing a chemical substance according to an embodiment of the present invention,
3 is a cross-sectional view of an electrical fusing mechanism for a fluid delivery tube containing a chemical substance according to one embodiment of the present invention,
FIG. 4 is a use state diagram of an electrical fusing mechanism for a transfer tube of a fluid containing a chemical substance according to an embodiment of the present invention;
5 is a cross-sectional view of an electrical fusing mechanism for a transfer tube of a fluid including a chemical substance according to another embodiment of the present invention,
6 is a cross-sectional view of an electrical fusing mechanism for a fluid delivery tube containing a chemical substance according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

FIG. 2 is a perspective view of an electric welding apparatus for a transfer tube of a fluid including a chemical substance according to an embodiment of the present invention, FIG. 3 is a perspective view of an electric welding apparatus for transferring a fluid including a chemical substance according to an embodiment of the present invention Fig. 4 is a view illustrating the state of use of an electric fusing mechanism for a transfer tube of a fluid including a chemical substance according to an embodiment of the present invention. Fig. 5 is a cross- Sectional view of the electric fusion mechanism.

As shown in these drawings, an electric welding apparatus for a fluid including a chemical substance according to an embodiment of the present invention includes a first section 110a through which an end of a first pipe 110a is inserted and fused to one side of an inner circumferential surface, A second section L2 is formed in which the end of the second pipe 110b is inserted and fused to the other side of the inner circumference of the inner circumferential surface so as to divide the first section L1 and the second section L2, A main body 210 having a stopper portion 250 formed to protrude along a circumferential direction; And a heating wire 230 embedded in the inner circumferential surfaces of the first section L1 and the second section L2 and connected to external power through the electrical connection terminals 220a and 220b formed in the main body 210 .

The main body 210 forms an inner circumferential surface so that the outer circumferential surfaces of the two first and second pipes 110a and 110b can be inserted.

That is, the main body 210 is formed in a hollow pipe shape. The main body 210 has a first section L1 where one end of the first pipe 110a is inserted and fused to one side of the inner circumferential surface, 2 pipe 110b is inserted and welded is formed in the second section L2.

Here, the main body 210 is provided with the electric connection terminals 220a and 220b and is connected to the heating wire 230 made of a helical coil.

The main body 210 includes electrical connection terminals 220a and 220b which are electrically connected to the heating wires 230 so as to apply external power to the heating wires 230 It acts as a terminal.

Accordingly, when the electric power is supplied through the electric connection terminals 220a and 220b, the electric wire 230 is heated and the peripheral portion thereof is melted.

The heating wire 230 is embedded in the inner circumferential surfaces of the first section L1 and the second section L2 and is connected to the external power source through the electrical connection terminals 220a and 220b formed in the main body 210. [

In the present invention, the heating wire 230 is a copper wire, a copper alloy wire, a nichrome wire, or the like, the electric resistance of which is maintained to some extent by the coated resistance wire, and the first section L1 and the second section L2 As shown in Fig.

Accordingly, when the electric wire 230 is energized for a predetermined time through the electric connection terminals 220a and 220b, the inner surface of the body 210 and the first and second pipes 110a and 110b, And the outer diameter surfaces are fused at the same time.

For example, the main body 210 is formed by injecting a thermoplastic resin into an injection mold and winding the coated superheated wire 230 in a coil shape, connecting the electrical connection terminals 220a and 220b to the end, inserting the same into the injection mold The thermoplastic resin is injected and molded.

Accordingly, after inserting the first and second pipes 110a and 110b to be fused to the main body 210 integrally injection-molded by inserting the heating wire 230 such as a heating coil therein, The inner diameter surface of the main body 210 and the outer diameters of the first and second pipes 110a and 110b are simultaneously melted and fused.

In addition, the main body 210 has a stopper portion 250 protruding from the inner circumferential surface so as to partition the first section L1 and the second section L2.

The stopper portion 250 is continuously protruded along the circumferential direction on the inner circumferential surface of the main body 210 so as to support the ends of the first and second pipes 110a and 110b inserted into the inner circumferential surface of the main body 210, The first and second pipes 110a and 110b are prevented from being moved in the axial direction during the process of fusion.

At this time, as shown in FIG. 5, one end or the end of the first pipe 110a or the end of the second pipe 110b is inserted into the stopper portion 250 ', and the fused protrusions 270a and 270b And may include support grooves 260a and 260b that are concavely recessed at one side or both sides in the axial direction to be fused.

That is, the stopper portion 250 'is formed with support grooves 260a and 260b recessed on both sides in the axial direction so that the end portion of the first pipe 110a and the end portion of the second pipe 110b are inserted and supported, respectively The first pipe 110a and the second pipe 110b are inserted into the main body 210 and then inserted into the support grooves 260a and 260b so that the first pipe 110a and the second pipe 110b So that the fusion can be stably fixed.

In addition, the stopper portion 250 'may be formed in a streamlined shape with the surface facing the center of the body 210 being convex so as to reduce the frictional resistance of the flowing fluid.

2 to 4, the stopper unit 250 is disposed at one of the end of the first pipe 110a or the end of the second pipe 110b to be melted and fused as the heating wire 230 is heated, Or fused protrusions 270a and 270b protruding along the circumferential direction at radially outer corners of the surfaces facing each other.

That is, the fused protrusions 270a and 270b are formed on the first pipe 110a and the second pipe 110b so as to be fused to the ends of the first pipe 110a and the second pipe 110b as the heating wire 230 generates heat. Protruding along the circumferential direction at the radially outer corner of the surface facing the end.

Accordingly, after the first and second pipes 110a and 110b are disposed in the electrical fusing mechanism for the fluid pipe including the chemical substance, the electrical connection terminals 220a and 220b are connected to the power supply device (not shown) The temperature of the inner diameter surface of the main body 210 and the outer diameters of the first and second pipes 110a and 110b rises due to the heat generated by the heating wire 230 embedded in the helical coil shape, At the same time, the ring-shaped fused protrusions 270a and 270b and the ends of the first and second pipes 110a and 110b are melted and fused.

Since the fused protrusions 270a and 270b are continuously protruded along the circumferential direction on the radially outer corner of the surface facing the end of the first pipe 110a and the second pipe 110b, .

The fused protrusions 270a and 270b are continuously formed in the circumferential direction in the support grooves 260a and 260b and fused to the ends of the first pipe 110a and the second pipe 110b, The heating wire 230 between the first pipe 110a and the second pipe 110b is not exposed.

That is, the ends of the first and second pipes 110a and 110b are respectively fitted into the support grooves 260a and 260b of the stopper portion 250 and fused together in a three-dimensionally mutually confronting state with the fused protrusions 270a and 270b, It is possible to prevent the heating wire 230 formed integrally with the main body 210 from being exposed to the fluid flowing therein and being chemically or electrically oxidized or altered.

In addition, since the fused protrusions 270a and 270b are fused to the ends of the first and second pipes 110a and 110b in a three-dimensionally mutual manner, a firm fusion state can be maintained to improve fusion workability, The second pipes 110a and 110b can be more firmly engaged with each other.

4, a pipe fusing method using an electrical fusing mechanism for a fluid including a chemical substance according to the present invention will be described.

4, the first and second pipes 110a and 110b are disposed in an electric welding apparatus for a fluid containing a chemical substance, and then the electric connection terminals 220a and 220b are connected to a power supply The inner surface of the main body 210 and the outer surfaces of the first and second pipes 110a and 110b are heated by the heating of the heating wire 230 embedded in the helical coil shape, The temperature of the molten glass rises.

At this time, the inner surface of the main body 210 and the first and second pipes 110a and 110b reach the softening temperature through the glass transition temperature as the temperature rises.

When the temperature of the melted portion rises and reaches the softening point, the first and second pipes 110a and 110b are advanced toward the stopper portion 250 to press the fused protrusions 270a and 270b. Then, the fused protrusions 270a The first and second pipes 110a and 110b are melted under a predetermined pressure and fused to the ends of the first and second pipes 110b and 110b. So that a bonded state is established.

That is, as the fused protrusions 270a and 270b are fused together with the ends of the first and second pipes 110a and 110b, the heating wire 230 between the first and second pipes 110a and 110b is connected to the outside It is possible to prevent the coating of the heating wire 230 from being corroded by the chemical substance in an environment where the chemical substance is used because the heating wire 230 is not exposed, .

The distal ends of the first and second pipes 110a and 110b are fitted into the support grooves 260a and 260b of the stopper portion 250 and fused together in a three-dimensional manner while being in contact with the fused protrusions 270a and 270b, It is possible to prevent the heating wire 230, which is integrally formed with the heating wire 210, from being exposed to the fluid flowing therein and being chemically or electrically oxidized or altered, as well as being able to maintain a firm fusion state, And the first and second pipes 110a and 110b can be more firmly engaged with each other.

3, the fused projections 270a and 270b protrude from the corners of the support grooves 260a and 260b. Alternatively, the fused projections 270a and 270b may protrude into the support grooves 260a and 260b .

The stopper portion 250 protrudes along the circumferential direction on a surface facing one or both of the end portion of the first pipe 110a or the end portion of the second pipe 110b so as to be melted and fused as the heating wire 230 generates heat And fused protrusions 270a and 270b to be formed.

That is, the stopper unit 250 is provided with fused protrusions 270a and 270b in the support grooves 260a and 260b so as to be fused with the ends of the first pipe 110a and the second pipe 110b as the heating wire 230 generates heat And is continuously protruded along the circumferential direction.

At this time, the fused protrusions 270a and 270b are continuously protruded along the circumferential direction, and a plurality of the fused protrusions 270a and 270b may be spaced apart at a predetermined interval in the radial direction.

Accordingly, after the first and second pipes 110a and 110b are disposed in the electrical fusing mechanism for the fluid pipe including the chemical substance, the electrical connection terminals 220a and 220b are connected to the power supply device (not shown) The temperature of the inner diameter surface of the main body 210 and the outer diameters of the first and second pipes 110a and 110b rises due to the heat generated by the heating wire 230 embedded in the helical coil shape, At the same time, the ring-shaped fused protrusions 270a and 270b and the ends of the first and second pipes 110a and 110b are melted and fused.

The fused protrusions 270a and 270b are continuously formed in the circumferential direction in the support grooves 260a and 260b and fused to the ends of the first pipe 110a and the second pipe 110b, The heating wire 230 between the first pipe 110a and the second pipe 110b is not exposed.

That is, the ends of the first and second pipes 110a and 110b are respectively fitted into the support grooves 260a and 260b of the stopper portion 250 and fused together in a three-dimensionally mutually confronting state with the fused protrusions 270a and 270b, It is possible to prevent the heating wire 230 formed integrally with the main body 210 from being exposed to the fluid flowing therein and being chemically or electrically oxidized or altered.

In addition, since the fused protrusions 270a and 270b are fused to the ends of the first and second pipes 110a and 110b in a three-dimensionally mutual manner, a firm fusion state can be maintained to improve fusion workability, The second pipes 110a and 110b can be more firmly engaged with each other.

6 is a cross-sectional view of an electrical fusing mechanism for a fluid delivery tube containing a chemical substance according to another embodiment of the present invention.

In still another embodiment of the present invention, the configuration of the stopper portion is the same as that of the above-described embodiment of the present invention, and therefore only the configuration of the stopper portion will be described.

In this embodiment, as shown in FIG. 6, the body 510 and the stopper 550 are manufactured separately.

The main body 510 has a stopper portion 550 coupled to an inner circumferential surface thereof so as to partition the first section L1 and the second section L2.

The stopper unit 550 is coupled to the inner circumferential surface of the main body 510 to support the ends of the first and second pipes 110a and 110b inserted into the inner circumferential surface of the main body 510, Thereby preventing the second pipes 110a and 110b from being moved in the axial direction.

That is, after inserting the first and second pipes 110a and 110b to be fused to the main body 510 integrally injection-molded by inserting the heating wire 530 such as a heating coil and the stopper portion 550, When the power supply apparatus is energized for a certain period of time, the inner diameter surface of the main body 510 and the outer diameter surfaces of the first and second pipes 110a and 110b are simultaneously melted and fused.

The stopper unit 550 is disposed in the radial direction of the surface facing one or both of the end of the first pipe 110a or the end of the second pipe 110b so that the stopper unit 550 is melted and fused as the heating wire 530 generates heat. And fused protrusions 570a and 570b protruding axially outward along the circumferential direction.

That is, the fused protrusions 570a and 570b are disposed on the first pipe 110a and the second pipe 110b so as to be fused to the ends of the first pipe 110a and the second pipe 110b as the heating wire 530 generates heat. And is axially protruded along the circumferential direction on the radially outer side of the surface facing the end.

Accordingly, after the first and second pipes 110a and 110b are disposed in the electrical fusing mechanism for the fluid pipe including the chemical substance, the electrical connection terminals 520a and 520b are connected to the power supply device (not shown) The temperature of the inner surface of the main body 510 and the outer surfaces of the first and second pipes 110a and 110b rises due to the heat generated by the heating wire 530 embedded in the helical coil shape, At the same time, the end portions of the ring-shaped fused protrusions 570a and 570b and the first and second pipes 110a and 110b are melted and fused.

Since the fused protrusions 570a and 570b are continuously protruded in the axial direction along the circumferential direction on the radially outer sides of the surfaces of the first pipe 110a and the second pipe 110b facing each other, So that bubbles are not formed.

As described above, the fusion protrusions 570a and 570b are continuously and axially protruded from the radially outer sides of the surfaces of the first pipe 110a and the second pipe 110b facing each other in the circumferential direction, The heating wire 530 between the first pipe 110a and the second pipe 110b is not exposed by being welded to the ends of the first pipe 110a and the second pipe 110b.

That is, the ends of the first and second pipes 110a and 110b are mutually three-dimensionally fused while being in contact with the fused protrusions 570a and 570b of the stopper portion 550, (530) is exposed to the fluid flowing therein and is prevented from being oxidized or altered chemically or electrically.

In addition, since the fused projections 570a and 570b are fused to the ends of the first and second pipes 110a and 110b in a mutually three-dimensional manner, a firm fusion state can be maintained to improve fusion workability, The second pipes 110a and 110b can be more firmly engaged with each other.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110a: first pipe
110b: second pipe
210:
220a, 220b: electrical connection terminal
230:
250: stopper portion
260a, 260b:
270a and 270b:

Claims (4)

A first section in which the end of the first pipe is inserted and fused is formed on one side of the inner circumferential surface, a second section in which the end of the second pipe is inserted and fused is formed on the other side of the inner circumferential surface, and the first section and the second section A body in which a stopper portion is formed on an inner peripheral surface so as to be divided or formed along a circumferential direction; And
An electric wire embedded in an inner circumferential surface of the first section and the second section and connected to an external power source through an electric connection terminal formed in the body;
And an electrical fusing device for a fluid containing a chemical substance.
The method according to claim 1,
The stopper portion
And a fused protrusion protruding along a circumferential direction at a radially outer corner of a surface of the first pipe or the end of the second pipe facing the one or both of the first pipe and the second pipe so that the heating wire is melted and fused as the heating wire is heated Wherein the chemical fusing material comprises a chemical substance.
3. The method of claim 2,
The stopper portion
And a support groove which is recessed and formed at one side or both sides of the axial direction so as to fuse with one or both of the end of the first pipe or the end of the second pipe and fuse with the fused protrusion An electric welding device for a fluid transferring tube.
The method according to claim 1,
The stopper portion
Wherein the surface facing the center of the body is formed in a convex shape so as to reduce the frictional resistance of the flowing fluid.

Images