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WO2018181231A1 - Procédé de production d'un joint soudé par point par résistance - Google Patents

Procédé de production d'un joint soudé par point par résistance Download PDF

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Publication number
WO2018181231A1
WO2018181231A1 PCT/JP2018/012259 JP2018012259W WO2018181231A1 WO 2018181231 A1 WO2018181231 A1 WO 2018181231A1 JP 2018012259 W JP2018012259 W JP 2018012259W WO 2018181231 A1 WO2018181231 A1 WO 2018181231A1
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WO
WIPO (PCT)
Prior art keywords
energization
plate
steel plate
electrode
resistance spot
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/JP2018/012259
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English (en)
Japanese (ja)
Inventor
央海 澤西
松田　広志
池田　倫正
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.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
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 JFE Steel Corp filed Critical JFE Steel Corp
Priority to CN201880021920.8A priority Critical patent/CN110461528B/zh
Priority to KR1020197028628A priority patent/KR102225221B1/ko
Priority to JP2018530804A priority patent/JP6410003B1/ja
Publication of WO2018181231A1 publication Critical patent/WO2018181231A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
    • B23K11/18—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
    • B23K11/20—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of different metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes

Definitions

  • the present invention relates to a method for manufacturing a resistance spot welded joint of dissimilar metal materials. Specifically, a resistance that produces a resistance spot welded joint by joining a plate assembly in which at least one kind of steel plate selected from a plated steel plate, a cold-rolled steel plate, and a hot-rolled steel plate and an aluminum plate are overlapped by resistance spot welding.
  • the present invention relates to a method for manufacturing a spot welded joint.
  • the resistance spot welding method is a method in which two or more stacked steel plates are sandwiched and pressed with a pair of electrodes from above and below, and a high current welding current is passed between the upper and lower electrodes for a short time to join by resistance heating. It is.
  • the aluminum plate is a general term for a pure aluminum plate and an aluminum alloy plate.
  • the strength of the joint, especially the cross can be reduced by reducing the thickness of the soft aluminum plate by pressing the electrode and forming a brittle intermetallic compound at the joint interface.
  • the peeling strength cannot be secured when a load in the peeling direction represented by tension or the like is generated.
  • Patent Document 1 describes a resistance spot welding method in which an iron / aluminum clad thin plate is inserted between a steel plate and an aluminum plate so that the same kind of materials face each other so that a high-strength joint can be obtained even at a low current. Yes.
  • Patent Document 2 by welding with one or more contact plates on both sides of a steel plate and an aluminum plate, the interface between the contact plate and the material to be joined generates resistance heat, and the steel and aluminum are resistance diffusion bonded.
  • a resistance spot welding method is described that provides a high strength joint.
  • Patent Document 3 when spot welding a steel material and an aluminum material, by optimizing each amount of Mn and Si in a steel plate and a steel plate surface oxide film, it is possible to suppress the occurrence of scattering while obtaining a large nugget diameter. It is described.
  • Patent Document 4 describes a dissimilar metal joining method that suppresses the growth of intermetallic compounds at the joining interface by optimizing the conditions for pulsation energization and increasing the pressure after completion of energization.
  • Patent Document 5 discloses a spot that can suppress the generation of dust from the surface of the steel sheet by optimizing the pre-energization and the subsequent energization conditions, reduce the welding current as much as possible, and obtain a dissimilar material joint having high joint strength. A welding method is described.
  • Japanese Patent No. 3117053 Japanese Patent No. 3504790 JP 2005-152958 A Japanese Patent No. 5624901 Japanese Patent No. 5572046
  • Patent Documents 1 and 2 require the use of a backing plate or a clad thin plate that is not necessary for the structure of the vehicle body, so that a significant increase in cost and weight cannot be achieved. There's a problem.
  • Patent Document 3 since it is necessary to limit the amount and distribution of alloy elements in the steel sheet and the oxide film, there is a problem that the use of the steel sheet that satisfies the required performance is restricted. In particular, the application of the invention of Patent Document 3 is extremely limited under the circumstances where high alloying is progressing with high strength in recent steel plates.
  • the energization time for pre-energization is 20 ms or less, and the energization time for pulsation energization is 10 ms or less, both of which are short. Required. Therefore, when the specific resistance of the steel plate is high or when the plate thickness is large, there is a concern that scattering occurs on the surface of the steel plate.
  • Patent Document 5 there is a problem that applicable plate sets are limited only to plate sets of cold-rolled steel plates and 6000 series aluminum alloy plates. In Patent Document 5, it is necessary to perform pre-energization under conditions that do not melt the aluminum alloy plate. However, since the aluminum alloy plate has a lower melting point than a steel plate, the appropriate condition range for pre-energization is extremely high depending on the plate assembly. There is also a problem of narrowing.
  • This invention is made
  • FIG. 1 is a diagram schematically showing a current distribution at the initial stage of energization in resistance spot welding.
  • FIG. 1 shows the distribution of current (welding current) when a plate assembly in which a steel plate 11 and an aluminum plate 12 are stacked is sandwiched between a pair of electrodes 13 and 14 and energized while being pressed. It is represented by reference numeral 21.
  • the present inventors examined welding conditions such as an energization pattern and electrodes that achieve both expansion of the joint diameter and reduction of heat input.
  • welding conditions such as an energization pattern and electrodes that achieve both expansion of the joint diameter and reduction of heat input.
  • a steel plate having a high specific resistance first generates heat, and the aluminum plate is melted by heat transfer from the steel plate to achieve joining. Therefore, the present inventors considered that it is important how to heat a wide range of steel plates in a short time in order to achieve both expansion of the joint diameter and reduction of heat input.
  • the present invention has been completed by further studies based on these findings, and the gist is as follows.
  • a plate assembly in which at least one type of steel plate selected from a plated steel plate, a cold-rolled steel plate and a hot-rolled steel plate and an aluminum plate are overlapped and one of the plates arranged on the outermost side is a steel plate and the other is an aluminum plate.
  • a resistance spot welded joint between a steel plate and an aluminum plate having good peel strength can be produced regardless of the components and the plate set of the steel plate and the aluminum plate.
  • FIG. 1 is a diagram schematically showing a current distribution at the initial stage of energization in resistance spot welding.
  • FIG. 2 is a diagram schematically showing resistance spot welding.
  • FIG. 3 is a diagram illustrating an energization pattern.
  • FIG. 4 is a diagram schematically illustrating a current distribution during energization in the second energization process.
  • FIG. 5 is a diagram showing the tip curvature radius and tip diameter of the electrode.
  • the method of manufacturing a resistance spot welded joint according to the present invention is such that at least one type of steel plate selected from a cold-rolled steel plate, a hot-rolled steel plate and a plated steel plate and an aluminum plate are overlapped and one of the plates arranged on the outermost side is a steel plate.
  • a plate assembly made of an aluminum plate on the other side is sandwiched between a pair of electrodes and joined by resistance spot welding, and then energized with a current I 1 (kA) for an energization time t 1 (ms).
  • a first energization step an energization deactivation step in which energization is suspended during an energization deactivation time t c (ms) after the first energization step, and an energization time t 2 (ms) with a current I 2 (kA) after the energization deactivation step.
  • the resistance spot welded joint is a generic name including a test piece used for strength test and cross-sectional observation, an automobile member joined by resistance spot welding, and the like.
  • FIG. 2 is a diagram schematically showing resistance spot welding.
  • FIG. 3 is a diagram illustrating an energization pattern.
  • FIG. 4 is a diagram schematically illustrating a current distribution during energization in the second energization process.
  • the present invention is a method of manufacturing a resistance spot welded joint, wherein a resistance spot welded joint is obtained by resistance spot welding in which a plate assembly in which a plurality of plates are stacked is sandwiched between a pair of electrodes and energized while being pressurized and joined (welded joint). is there.
  • the steel plate 11 and the aluminum plate 12 are overlapped to form a plate assembly.
  • one of the plates arranged on the outermost side is a steel plate 11 and the other is an aluminum plate 12.
  • the plates 13 and 14 are brought into contact with each other so as to become the steel plate 11 and the aluminum plate 12, respectively.
  • FIG. 2 although the example of the resistance spot welded joint of the board set of 2 sheets which piled up the steel plate 11 and the aluminum plate 12 one by one was shown, between the steel plate 11 and the aluminum plate 12, Furthermore, it is good also as a plate
  • the plate constituting the resistance spot welded joint is at least one type of steel plate selected from a plated steel plate, a cold rolled steel plate and a hot rolled steel plate, and an aluminum plate.
  • the plated steel sheet is a steel sheet having a metal plating layer on the surface, and examples of the metal plating layer include a Zn-based plating layer and an Al-based plating layer.
  • the Zn-based plating include general hot-dip galvanizing (GI), alloyed hot-dip galvanizing (GA), electrogalvanizing (EG), and Zn—Ni-based plating (for example, Zn containing 10 to 25% by mass of Ni).
  • the component of the steel plate 11 is not particularly limited. Further, the strength of the steel plate 11 is not particularly limited. For example, a JIS No. 5 tensile test piece is produced from the steel plate in a direction parallel to the rolling direction, and a tensile test is performed in accordance with the provisions of JIS Z 2241: 2011. The steel sheet has a tensile strength of 270 MPa to 1800 MPa (270 MPa to 1800 MPa class).
  • the component of the aluminum plate is not particularly limited, either a pure aluminum plate or an aluminum alloy plate.
  • the aluminum alloy plate include 5000 series (Al-Mg series), 6000 series (Al-Mg-Si series), 2000 series (Al-Cu series), and 7000 series (Al-Zn-Mg series) defined by JIS. And Al-Zn-Mg-Cu-based).
  • An oxide film is formed on the surface of the aluminum plate.
  • the thickness of the steel plate 11 or the aluminum plate 12 is not particularly limited, but is preferably in a range (about 0.5 to 4.0 mm) that can be used for a general automobile body.
  • the plate set in which the steel plate 11 and the aluminum plate 12 are overlapped is sandwiched between a pair of welding electrodes (electrode 13 and electrode 14), and energized while being pressed, and then the electrode is released from the steel plate.
  • a welding apparatus that can be used in the resistance spot welding method of the present invention, a welding apparatus that includes a pair of upper and lower electrodes and can arbitrarily control the pressure and welding current during welding can be used.
  • the pressurization mechanism air cylinder, servo motor, etc.
  • type stationary, robot gun, etc.
  • the present invention can be applied to both direct current and alternating current, and the type of power source (single-phase alternating current, alternating current inverter, direct current inverter) and the like are not particularly limited.
  • alternating current means “effective current”.
  • resistance spot welding is performed in a state that is always water-cooled.
  • the steel plate 11 and the aluminum plate 12 are overlapped so that one of the plates arranged on the outermost side is the steel plate 11 and the other is the aluminum plate 12 to form a plate set.
  • the plate assembly is sandwiched between a pair of welding electrodes (electrode 13 and electrode 14), energized while being pressurized, a nugget is formed by resistance heat generation, and the overlapped steel plate 11 and aluminum plate 12 are joined together, thereby providing resistance. A spot welded joint is obtained.
  • this energization is a specific pattern. That is, in the energization pattern of the present invention, for example, as shown in FIG. 3, the first energization step of energizing with the current I 1 (kA) for the energization time t 1 (ms) and the energization pause time after the first energization step. an energization stop process for stopping energization for t c (ms), and a second energization process for energizing for the energization time t 2 (ms) with the current I 2 (kA) after the energization stop process.
  • energization of one or more stages is performed as necessary, and then energization is performed after the third stage for the purpose of post heat treatment, for example, and then the energization is stopped.
  • the energization path is limited by the oxide film on the surface of the aluminum plate 12 at the beginning of energization. Therefore, in the present invention, first, in the first energization process (first stage energization), energization is performed for a longer time and at a lower current than in the second energization process (see the above formulas (1) and (2)). . Thereby, by destroying the oxide film on the surface of the aluminum plate 12, an energization path between the steel plate 11 and the aluminum plate 12 is secured, and an excessive increase in heat input is prevented. Further, the energization time t 1 of the first conducting step (see above formula (3)) by the above 40 ms, the current path between the steel plate 11 and aluminum plate 12 can be sufficiently secured.
  • FIG. 4 is a diagram schematically illustrating a current distribution during energization in the second energization process. As shown in FIG. 4, since the current density is high in the contact end vicinity 22 between the steel plate 11 and the electrode 13, heat generation in the contact end vicinity 22 is promoted as the current is increased.
  • the increase in current in the second energization step is effective in generating heat over a wide area by short-time energization, and the aluminum plate 12 can be melted over a wide area, thereby expanding the bonding diameter.
  • the center of the joint where the oxide film is initially destroyed in the first energization process and energization starts is at a higher temperature. Therefore, if the energization pause time t c in the energization pause process is short, since the re-heated from the hot junction center as was briefly and high current of the power supply of the second current supply step, heat input becomes excessively large easy.
  • the energization stop time t c is 5 ms or more (see the above equation (4)) and the energization stop step satisfying the above equation (5) is performed, and then the second energization step with a high current and a short time is performed. To do.
  • the temperature at the center of the joint portion once decreases in the energization suspending process, and thus energization in the second energizing process can promote heat generation in the vicinity of the contact end 22 between the steel plate 11 and the electrode 13 having a high current density.
  • the nugget diameter can be expanded while suppressing.
  • the relational expression (5) (that is, the right side of the above expression (5)) including similar parameters is set for the upper limit value of t c .
  • the energization time t 2 in the second energizing step for example, 5 ⁇ 100 ms is preferable.
  • the electrode 13 that satisfies the above formula (6) that is, the electrode 13 that is brought into contact with the steel plate 11 has a tip curvature radius R Fe of 20 mm or more. Must be used. This is because the contact area between the steel plate 11 and the electrode 13 is increased by increasing the tip curvature radius R Fe of the electrode 13 to be brought into contact with the steel plate 11, thereby increasing the energization area in the second energization step, and the heat generation range of the steel plate 11. This is because the bonding diameter can be increased.
  • the contact area between the steel plate 11 and the electrode 13 is increased, heat removal to the electrode 13 is promoted, and the energization stop time t c after the end of the first energization process can be shortened.
  • production of the scattering from the steel plate surface is also acquired by preventing the excessive increase in the current density in the contact end vicinity 22 of the steel plate 11 and the electrode 13.
  • the electrode 13 is brought into contact with the steel plate 11, tip curvature radius R Fe satisfies a relationship represented by the following formula (7), that the tip curvature radius R Fe it is preferable to use an electrode is at least 50mm.
  • the reason is suppression of surface scattering by enlarging the contact area of an electrode and a steel plate, and reducing a current density.
  • the type of the tip of the electrode 13 is, for example, DR type (dome radius type), R type (radius type), or D type (dome type) described in JIS C 9304: 1999.
  • FIG. 5 shows the tip radius of curvature R and the tip diameter D of the electrode.
  • FIG. 5A is a diagram showing the tip radius of curvature R and the tip diameter D of the radius electrode
  • FIG. 5B is a diagram showing the tip radius of curvature R and the tip diameter D of the dome radius electrode. . As shown in FIG.
  • the dome radius electrode has a curved surface on the tip side with a two-step curvature.
  • the radius of curvature of the tip of the electrode is a portion (center) that first contacts the plate to be resistance spot welded. Radius of curvature of the curved surface on the side.
  • the tip diameter D Fe of the electrode 13 in contact with the steel plate 11 is preferably 4 mm to 16 mm, for example, from the viewpoint of securing the contact area between the electrode and the steel plate.
  • the tip diameter D Fe of the electrode 13 is more preferably 6 mm to 16 mm, and further preferably 8 mm to 16 mm.
  • the specific electrode as the electrode 13 that is made in the specific energization pattern and brought into contact with the steel plate 11, excessive heat generation can be prevented while melting the aluminum plate 12 in a wide range. It is possible to achieve both the expansion of the bonding diameter and the suppression of growth of the intermetallic compound at the bonding interface by reducing the heat input. Therefore, in this invention, the resistance spot welded joint of the steel plate 11 and the aluminum plate 12 which has favorable peeling strength can be manufactured.
  • the presence or thickness of the metal plating layer on the surface of the steel plate or aluminum plate, the composition or thickness of the oxide film, the mother It can be applied regardless of material strength and plate thickness.
  • the electrode 14 in contact with the aluminum plate 12 satisfies the following formula (8) when the tip curvature radius of the electrode 14 in contact with the aluminum plate 12 is R Al (mm), that is, the tip curvature radius R Al is It is preferable that the electrode be 50 mm or more. Thereby, the effect of the present invention can be obtained more effectively. This is because the effect of suppressing the thickness reduction of the aluminum plate 12 due to energization can be obtained by reducing the surface pressure applied to the aluminum plate 12.
  • the tip radius of curvature R Al is more preferably 80 mm or more.
  • the type of the tip of the electrode 14 brought into contact with the aluminum plate 12 is, for example, DR type (dome radius type), R type (radius type), or D type (dome type) described in JIS C 9304: 1999.
  • the tip diameter D Al of the electrode 14 brought into contact with the aluminum plate 12 is preferably 4 mm to 16 mm, for example, from the viewpoint of reducing the surface pressure applied to the aluminum alloy plate.
  • the tip diameter D Al of the electrode 14 is more preferably 6 mm to 16 mm, and further preferably 8 mm to 16 mm. Also, there is no particular relationship between the tip diameter D Al of the electrode 14 on the aluminum plate 12 side and the tip diameter D Fe of the electrode 13 on the steel plate 11 side, and both may be the same or different. Also good.
  • energization time t 1 of the first energizing step is preferably set to 50ms or more, and more preferably, 60ms or more.
  • the upper limit of the energization time t 1 of the first energizing step is not particularly defined, in view of the tact time shortened, preferably, the energization time t 1 is less than 600 ms.
  • the aluminum plate 12 is melted during energization in the first energization process. Since the aluminum plate 12 is melted during energization in the first energization step, the oxide film on the surface of the aluminum plate 12 is completely removed, so that the energization path can be stabilized. However, in order to prevent excessive heat input, when the thickness of the aluminum plate 12 located on the outermost side and brought into contact with the electrode 14 is T (mm), the electrode 14 formed by energization in the first energization step is used.
  • the nugget diameter of the outermost aluminum plate 12 to be contacted is preferably 6 ⁇ T (mm) or less, and more preferably 5 ⁇ T (mm) or less.
  • the nugget diameter of the outermost aluminum plate 12 formed by energization in the first energization process and brought into contact with the electrode 14 is 2 ⁇ T (mm) or more.
  • the thickness T of the aluminum plate 12 uses mm as a unit, and the unit of 6 ⁇ T or 5 ⁇ T into which T is substituted is also mm.
  • the nugget diameter of the aluminum plate 12 is the maximum diameter of the nugget of the aluminum plate 12 at the mating surface (joint surface) between the aluminum plate 12 and the plate (steel plate 11 in FIG. 2) in contact with the aluminum plate 12. is there.
  • the “nugget” is a melted and solidified portion generated in a welded portion in lap resistance welding. In this specification, a melted portion that becomes a nugget when solidified (that is, a melted portion before solidifying) is also called a nugget. There is a case.
  • energization pause time t c is preferably greater than or equal to 10 ms, and more preferably to more than 20ms. And, energization pause time t c, it is preferable to satisfy the relation of formula (9), more preferably satisfies the following formula (10). The reason for this is that once the weld is cooled, a wide range of heat generation is promoted in the second energization step, and the joint strength is improved.
  • the welding current (current when energized) in the present invention is not particularly limited, and the welding current is, for example, 4 to 40 kA. However, since it is necessary to obtain a predetermined nugget diameter in construction, an excessive current value causes scattering, so the current I 1 in the first energization process is, for example, 4 to 20 kA, and the current in the second energization process the value I 2 is, for example, 10 ⁇ 40 kA.
  • the applied pressure is, for example, 2.0 kN to 7.0 kN, and the applied pressure may be changed during welding and before and after welding.
  • the steel plate and aluminum plate shown in Table 1-2 are not shown, but resistance spot welding is similarly performed, and another steel plate is provided between the steel plate 11 (lower plate) and the aluminum plate 12 (upper plate).
  • a resistance spot welded joint made of a three-layered plate assembly sandwiching 15 (medium plate) was produced.
  • the aluminum plate 12 used had an oxide film formed on the surface.
  • An inverter DC resistance spot welder was used as the welding machine, and the tip curvature radius and tip diameter of the electrodes 13 and 14 and the energization pattern were set as shown in Table 2.
  • the electrodes 13 and 14 were all DR type electrodes made of chromium copper. Resistance spot welding was performed at room temperature (20 ° C.), and the electrodes 13 and 14 were always water-cooled. The applied pressure was constant throughout the first energization process, the energization stop process, and the second energization process. In the first energization process, a part of the aluminum plate 12 was melted.
  • the resulting resistance spot welded joint was subjected to a cross tensile test based on JIS Z 3137 to evaluate the peel strength.
  • CTS cross tensile strength
  • Each case of CTS was evaluated as F and evaluated.
  • the evaluation results are shown in Table 2. In the example of the present invention, the evaluation was any one of A to C.
  • the first energization process was performed under the same conditions as described above, the cross section of the joint was observed, and the nugget diameter (mm) of the aluminum plate 12 formed by energization in the first energization process was obtained.
  • the nugget diameter of the aluminum plate 12 is such that the aluminum plate 12 and the plate in contact with the aluminum plate 12 (steel plate 11 or steel plate 15 in the case of the three-layered plate set shown in Table 1-2) are aluminum
  • the maximum diameter of the nugget on the plate 12 was measured. The measurement results are shown in Table 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)

Abstract

La présente invention concerne la production d'un joint soudé par point par résistance qui comprend un empilement composé de feuilles d'aluminium et d'au moins un type de feuille d'acier choisi parmi les feuilles d'acier plaquées, les feuilles d'acier laminées à froid et les feuilles d'acier laminées à chaud. Les feuilles sont combinées de telle sorte que l'une des feuilles les plus externes est une feuille d'aluminium et l'autre est une feuille d'acier. La présente invention comprend : une première étape d'électrification qui consiste à appliquer un courant I1 (kA) pendant un temps d'électrification t1 (ms); une étape d'interruption de l'électrification qui suit la première étape d'électrification et qui consiste à interrompre l'électrification pendant un temps d'interruption d'électrification tc (ms); et une seconde étape d'électrification qui suit l'étape d'interruption de l'électrification et qui consiste à appliquer un courant I2 (kA) pendant un temps d'électrification t2 (ms). La présente invention satisfait les expressions (1) - (6), dans lesquelles TFe (mm) est l'épaisseur totale des feuilles d'acier empilées, RFe (mm) est le rayon de courbure de la pointe d'une électrode qui est amenée à entrer en contact avec les feuilles d'acier, et DFe (mm) est le diamètre de la pointe de l'électrode qui est amenée à entrer en contact avec les feuilles d'acier : (1) I1<I2, (2) t1>t2, (3) t1≥40, (4) tc≥5, (5) 3+0.04×√(I1 2×t1×TFe/DFe)≤tc≤495+√(I1 2×t1×TFe/DFe), and (6) RFe≥20.
PCT/JP2018/012259 2017-03-31 2018-03-27 Procédé de production d'un joint soudé par point par résistance Ceased WO2018181231A1 (fr)

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Application Number Priority Date Filing Date Title
CN201880021920.8A CN110461528B (zh) 2017-03-31 2018-03-27 电阻点焊接头的制造方法
KR1020197028628A KR102225221B1 (ko) 2017-03-31 2018-03-27 저항 스폿 용접 조인트의 제조 방법
JP2018530804A JP6410003B1 (ja) 2017-03-31 2018-03-27 抵抗スポット溶接継手の製造方法

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JP2017069474 2017-03-31
JP2017-069474 2017-03-31

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KR (1) KR102225221B1 (fr)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109317801A (zh) * 2018-12-03 2019-02-12 闫宇 一种镀镍铜线束与铜板的微点焊工艺
JP2021041441A (ja) * 2019-09-12 2021-03-18 マツダ株式会社 抵抗溶接装置及び抵抗溶接方法
WO2023117663A1 (fr) * 2021-12-22 2023-06-29 Plansee Composite Materials Gmbh Capuchon d'électrode de soudage par points
JP7570998B2 (ja) 2021-10-29 2024-10-22 株式会社豊田中央研究所 金属接合体の製造方法

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KR102348579B1 (ko) * 2020-11-24 2022-01-06 주식회사 포스코 열간성형용 강판의 저항 점용접 방법
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CN109317801A (zh) * 2018-12-03 2019-02-12 闫宇 一种镀镍铜线束与铜板的微点焊工艺
JP2021041441A (ja) * 2019-09-12 2021-03-18 マツダ株式会社 抵抗溶接装置及び抵抗溶接方法
JP7363240B2 (ja) 2019-09-12 2023-10-18 マツダ株式会社 抵抗溶接装置及び抵抗溶接方法
JP7570998B2 (ja) 2021-10-29 2024-10-22 株式会社豊田中央研究所 金属接合体の製造方法
WO2023117663A1 (fr) * 2021-12-22 2023-06-29 Plansee Composite Materials Gmbh Capuchon d'électrode de soudage par points

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JP6410003B1 (ja) 2018-10-24
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