WO2018181232A1 - Procédé de production d'un joint soudé par points par résistance - Google Patents

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

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Publication number
WO2018181232A1
WO2018181232A1 PCT/JP2018/012260 JP2018012260W WO2018181232A1 WO 2018181232 A1 WO2018181232 A1 WO 2018181232A1 JP 2018012260 W JP2018012260 W JP 2018012260W WO 2018181232 A1 WO2018181232 A1 WO 2018181232A1
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Prior art keywords
energization
plate
steel
resistance spot
aluminum
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PCT/JP2018/012260
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English (en)
Japanese (ja)
Inventor
央海 澤西
松田　広志
池田　倫正
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Ｊｆｅスチール株式会社
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Priority to JP2018530805A priority Critical patent/JP6399266B1/ja
Priority to KR1020197028629A priority patent/KR102276817B1/ko
Priority to CN201880022069.0A priority patent/CN110475642B/zh
Publication of WO2018181232A1 publication Critical patent/WO2018181232A1/fr

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    • 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, the present invention relates to a resistance spot welded joint manufacturing method in which a plate set in which two steel plates and one aluminum plate are overlapped is joined by resistance spot welding to produce a resistance spot welded joint.
  • the resistance spot welding method which is superior in cost and efficiency compared to other welding methods, is most often used for joining steel plates in a vehicle body, and the number of hits per vehicle is 3000 to 6000.
  • the resistance spot welding method is a method in which two or more stacked steel plates are sandwiched between a pair of electrodes, and a high current welding current is shortened between the upper and lower electrodes while pressing with a pair of electrodes from above and below the sandwiched steel plates. This is a method of energizing for a time and joining by resistance heating.
  • the resistance spot welding method in the joining in the case where aluminum plates are mixed, as in the joining in the case of steel plates.
  • the aluminum plate is a general term for a pure aluminum plate and an aluminum alloy plate.
  • the strength of the joint cannot be ensured because the soft aluminum plate is greatly reduced in thickness by pressurization of the electrode or a brittle intermetallic compound is formed at the joint interface. There is a problem.
  • 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 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, depending on the plate assembly, the appropriate condition range of pre-energization may be. There is also the problem of becoming very narrow.
  • This invention is made
  • FIG. 1 is a diagram schematically showing resistance spot welding of the present invention, in which two steel plates (middle plate) 11 and a steel plate (lower plate) 12 and an aluminum plate (upper plate) 13 are overlaid. It is a figure which clamps a set with a pair of electrodes 14 and 15.
  • FIG. 2 is a figure which shows typically the electric current distribution of the energization initial stage of resistance spot welding.
  • FIG. 2 shows an initial current (welding current) when a plate assembly in which two steel plates 11 and 12 and an aluminum plate 13 are stacked is sandwiched between a pair of electrodes 14 and 15 and energized while being pressed. Is represented by reference numeral 21 in FIG.
  • the total thickness of the steel plates is larger in a three-layered plate set using two steel plates and one aluminum plate. For this reason, insufficient heat removal from the electrodes tends to cause scattering not only between the steel plates but also on the steel plate surface. For the above reasons, there is a limit to shortening the energization time and increasing the current.
  • the present invention has been completed by further studies based on these findings, and the gist is as follows.
  • a plate assembly in which two steel plates and one 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 is joined by resistance spot welding to form a resistance spot welded joint
  • a first nugget having a nugget diameter of 2 ⁇ t Fe (mm) or more is energized between the two steel plates.
  • a method of manufacturing a resistance spot welded joint including a second energization step of energizing after the energization suspending step.
  • a resistance spot welded joint consisting of two steel plates and one aluminum plate, which has a good joint strength regardless of the components and the plate set of the steel plates and aluminum plates. Can be manufactured.
  • FIG. 1 is a diagram schematically showing resistance spot welding of the present invention.
  • FIG. 2 is a diagram schematically showing a current distribution in the initial stage of energization of resistance spot welding.
  • FIG. 3 is a diagram illustrating an energization pattern.
  • FIG. 4 is a diagram showing the tip curvature radius and tip diameter of the electrode.
  • FIG. 5 is a diagram for explaining a tensile test (tensile shear test) of an example of the present invention.
  • FIG. 6 is a diagram for explaining a tensile test (cross tensile test) of an example of the present invention.
  • the method of manufacturing a resistance spot welded joint comprises a plate assembly in which two steel plates and one 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 by welding, when the thickness of the thinner steel plate of the two steel plates is t Fe (mm), the nugget diameter is 2 between the two steel plates when energized.
  • a first power supply step of forming a ⁇ t Fe (mm) or more of the nugget and has a current pause step of pausing the current after the first current step, and a second current supply step of energizing after the energization pause step .
  • the resistance spot welded joint is a generic name including a test piece used for strength test, cross-sectional observation, an automobile member joined by resistance spot welding, and the like.
  • the present invention obtains a resistance spot welded joint by resistance spot welding in which a plate assembly in which two steel plates and one aluminum plate are overlapped is sandwiched between a pair of electrodes and energized while being pressed (welded). It is a manufacturing method of a resistance spot welded joint.
  • the steel plate 11, the steel plate 12, and the aluminum plate 13 are overlapped to form a plate assembly.
  • one of the plates arranged on the outermost side is a steel plate 12 and the other is an aluminum plate 13.
  • the plates that contact the electrodes 14 and 15 are overlapped so as to become the steel plate 12 and the aluminum plate 13, respectively.
  • the steel plates 11 and 12 are not particularly limited, and examples thereof include cold rolled steel plates, hot rolled steel plates, and plated steel plates.
  • 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).
  • GI general hot-dip galvanizing
  • GA alloyed hot-dip galvanizing
  • EG electrogalvanizing
  • Zn—Ni-based plating for example, Zn containing 10 to 25% by mass of Ni.
  • -Ni-based plating Zn-Al-based plating, Zn-Mg-based plating, Zn-Al-Mg-based plating, and the like.
  • Al plating examples include Al—Si plating (for example, Al—Si plating containing 10 to 20% by mass of Si).
  • the components of the steel plates 11 and 12 are not particularly limited.
  • the strength of the steel plates 11 and 12 is not particularly limited.
  • 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.
  • a high-strength steel sheet having a tensile strength of 590 MPa or more (590 MPa class or more), or 980 MPa or more (980 MPa class or more) can be used.
  • the steel plate 11 and the steel plate 12 may have the same or different components, and there is no problem whether the strength and the thickness are the same or different, and a plated steel plate having a metal plating layer and a steel plate having no metal plating layer are used. May be.
  • the components of the aluminum plate 13 are not particularly limited, and may be a pure aluminum plate or an aluminum alloy plate. Examples of 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 13.
  • the thickness of the steel plates 11 and 12 and the aluminum plate 13 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.
  • a plate assembly in which the steel plates 11 and 12 and the aluminum plate 13 are overlapped is sandwiched between a pair of welding electrodes (electrode 14 and electrode 15), and energized while being pressed, and then the electrodes are 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 pressure mechanism air cylinder, servo motor, etc.
  • type stationary, robot gun, etc.
  • electrode shape, etc. of the welding apparatus there are no particular limitations on the pressure mechanism (air cylinder, servo motor, etc.), type (stationary, robot gun, etc.), electrode shape, etc. of the welding apparatus.
  • 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 plates 11 and 12 and the aluminum plate 13 are overlapped so that one of the plates arranged on the outermost side is the steel plate 12 and the other is the aluminum plate 13 to form a plate set.
  • the plate assembly is sandwiched between a pair of welding electrodes (electrode 14 and electrode 15), energized while being pressed, and nuggets 16 and 17 are formed by resistance heating, and the stacked steel plates 11 and 12 and the aluminum plate 13 are joined. By doing so, a resistance spot welded joint is obtained.
  • this energization is a specific pattern. That is, the energization pattern of the present invention is, for example, as shown in FIG. 3, when the thickness of the thinner one of the two steel plates is t Fe (mm), the two steel plates 11 and 12 are energized. a first power supply step of nugget diameter forms a 2 ⁇ t Fe (mm) or more of the nugget between the energization pause step of pausing the current after the first energization step, a second current supply step of energizing after the energization pause step And have.
  • 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 second energization process By forming a nugget having a diameter (nugget diameter) of 2 ⁇ t Fe (mm) or more between the steel plates 11 and 12 in the first energization process (first stage energization), the second energization process (second stage energization) The effect of preventing the nugget diameters of the nuggets 16 and 17 from being reduced due to excessive scattering during energization is obtained.
  • the steel plate 11 is deformed due to the thermal effect of energization in the first energization step for forming a nugget having a diameter of 2 ⁇ t Fe (mm) or more, the contact area between the steel plate 12 and the electrode 14 is increased.
  • the current density in the vicinity of the surface of the steel plate 12 during energization in the two energization process is reduced, and the effect of suppressing the occurrence of scattering from the surface of the steel plate 12 can also be obtained. Furthermore, the oxide film on the surface of the aluminum plate 13 is destroyed by the energization of the first energization process and the heat effect, and an energization path between the steel plate and the aluminum plate is secured. Therefore, an increase in heat input due to an excessive increase in current density at the center of the joint is suppressed in energization in the second energization process. In this first energization step, a nugget may or may not be formed between the steel plate and the aluminum plate.
  • the nugget diameter (mm) is desirably 6 ⁇ t Al or less. More preferably, the lower limit of the nugget diameter (mm) of the nugget formed between the steel plate and the aluminum plate in the first energization step is set to 1.5 ⁇ t Al or more.
  • the plate thickness t Fe and t Al is used mm as the unit, also with mm unit of 2 ⁇ T Fe and 6 ⁇ T Al obtained by substituting the thickness t Fe and t Al.
  • the nugget diameter of the nugget formed between the steel plates is the nugget of the steel plate 12 at the mating surface (joint surface) between the steel plate 12 brought into contact with the electrode 14 and the steel plate 12 (steel plate 11 in FIG. 1). Is the maximum diameter.
  • the nugget diameter of the nugget formed between the steel plate and the aluminum plate is the aluminum plate at the mating surface (joint surface) between the aluminum plate 13 and the plate in contact with the aluminum plate 13 (steel plate 11 in FIG. 1).
  • the nugget diameters of the nuggets 16 and 17 are shown in FIG.
  • 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.
  • the resistance spot welded joint of the steel plate 11, the steel plate 12, and the aluminum plate 13 which has favorable joint strength can be manufactured.
  • the resistance spot welded joint having a good joint strength refers to a resistance spot welded joint having either or both of tensile shear strength (TSS) and cross tensile strength (CTS).
  • the first energization process is conducted for a longer time and at a lower current than the second energization process, thereby causing the scattering between the steel plates as described above. While suppressing, a nugget diameter of 2 ⁇ t Fe (mm) or more is secured.
  • the energization path is limited by the oxide film on the surface of the aluminum plate 13 at the initial stage of energization, but this long time and low current energization destroys the oxide film, and the steel plates 11 and 12 and aluminum While ensuring the energization path between the plates 13, an excessive increase in heat input is prevented.
  • route between the steel plates 11 and 12 and the aluminum plate 13 is fully securable by making the electricity supply time t1 of a 1st electricity supply process into 40 ms or more.
  • energization is suspended for a predetermined energization suspension time t c (ms) (energization suspension process), and following this energization suspension process, the second energization process (second-stage energization process).
  • t c energization suspension time
  • second energization process second-stage energization process
  • 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 13 in a wide area can be melted, thereby increasing the bonding diameter.
  • the contact diameter between the steel plate 12 and the electrode 14 is increased by energization in the first energization step, the scattering from the surface of the steel plate 12 is unlikely to occur.
  • 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.
  • 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 between the steel plate 12 and the electrode 14 having a high current density. It is possible to increase the temperature of the aluminum plate 13 and to ensure the nugget diameter of the aluminum plate 13 and to reduce the heat input. Note that in the second energization step, scattering that does not cause an excessive decrease in the nugget diameter may occur. Further, the energization time t 2 in the second energizing step is preferably from the viewpoint of the nugget diameter ensuring the excess heat input suppressed, for example, 5 ⁇ 100 ms. Energizing time t 2 in the second energizing step is more preferably 5 ⁇ 90 ms, more preferably from 10 ⁇ 80 ms.
  • the effect of the present invention can be obtained more effectively by using an electrode having a tip radius of curvature R Fe of 20 mm or more as the electrode 14 in contact with the steel plate 12. be able to. This is because the contact radius between the electrode and the steel plate can be ensured by setting the tip curvature radius R Fe to 20 mm or more, and scattering from the steel plate surface can be easily suppressed. Furthermore, as the electrode 14 in contact with the steel plate 12, it is preferable to use an electrode satisfying the relationship of the following formulas (6) and (7) when the tip diameter of the electrode 14 in contact with the steel plate 12 is D Fe (mm). .
  • the tip curvature radius R Fe of the electrode 14 is more preferably 100 mm or more.
  • the upper limit of the tip curvature radius R Fe is not particularly specified.
  • the tip diameter D Fe of the electrode 14 is more preferably 4 mm or more, and further preferably 5 mm or more. Although not specified tip diameter D limit of Fe is particularly in view of ensuring the current density and the surface pressure is preferably set to 20mm or less.
  • the type of the tip of the electrode 14 is, for example, DR type (dome radius type), R type (radius type), or D type (dome type) described in JIS C 9304: 1999.
  • FIG. 4 shows the tip radius of curvature R and the tip diameter D of the electrode.
  • 4A is a diagram showing the tip radius of curvature R and the tip diameter D of the radius-shaped electrode
  • FIG. 4B is a diagram showing the tip radius of curvature R and the tip diameter D of the dome radius-shaped electrode.
  • the dome radius-shaped electrode has a curved surface on the tip side with a two-step curvature, but the radius of curvature of the tip of the electrode is a portion (center) that is first in contact with the plate to be resistance spot welded. Radius of curvature of the curved surface on the side.
  • the type of the tip of the electrode 15 brought into contact with the aluminum plate 13 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 15 brought into contact with the aluminum plate 13 is preferably 4 to 16 mm, for example, from the viewpoint of suppressing deformation of the aluminum plate and securing the surface pressure. More preferably, it is 6 to 16 mm.
  • the tip radius of curvature R Al of the electrode 15 brought into contact with the aluminum plate 13 is preferably set to, for example, 30 mm or more from the viewpoint of suppressing deformation of the aluminum plate and securing the surface pressure. More preferably, it is 40 mm or more.
  • the upper limit of the tip curvature radius R Al is not particularly defined.
  • t 1 of the first energizing step 50ms or more, and more preferably to 60ms or more.
  • t 1 is preferably 800 ms or less, and more preferably 600 ms or less.
  • energization pause time t c is preferably greater than or equal to 10 ms, and more preferably to more than 20ms.
  • t c is preferably 600 ms or less, and more preferably 400 ms or less.
  • 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, 5 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 plates 11 and 12 and the aluminum plate 13 shown in Table 1 were used as test materials.
  • the tensile strengths of the steel plates 11 and 12 shown in Table 1 were obtained by preparing a JIS No. 5 tensile test piece in a direction parallel to the rolling direction from the steel plate and conducting a tensile test in accordance with the provisions of JIS Z 2241: 2011. Asked.
  • the steel plates 11 and 12 and the aluminum plate 13 shown in Table 1 are made of a three-layered plate set in which resistance spot welding is performed and one aluminum plate and two steel plates are overlapped as shown in FIG. A resistance spot welded joint was manufactured.
  • the aluminum plate 13 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 14 and 15 and the energization pattern were set as shown in Table 2.
  • the electrodes 14 and 15 were all made of chromium-copper DR type electrodes. Resistance spot welding was performed at room temperature (20 ° C.), and the electrode was always water-cooled. The applied pressure was constant throughout the first energization process, the energization stop process, and the second energization process.
  • FIG. 5 the figure explaining the tension test (tensile shear test) of an Example is shown.
  • a tensile shear test between a steel plate and an aluminum plate was performed by pulling in the direction of the arrow from both sides of the resistance spot welded joint.
  • ruptured was computed.
  • the tensile shear strength (TSS) was evaluated as A when TSS ⁇ 1.5 kN, B when 1.5 kN> TSS ⁇ 1.0 kN, and F when 1.0 kN> TSS.
  • FIG. 6 is a view for explaining the tensile test (cross tensile test) of the example. As shown in FIG. 6, a cross tension test between a steel plate and an aluminum plate was performed by pulling in the direction of the arrow from both sides of the resistance spot welded joint. And the maximum load (cross tensile strength) when the junction part of a steel plate and an aluminum plate fracture
  • the cross tensile strength (CTS) was evaluated as A when CTS ⁇ 0.7 kN and F when 0.7 kN> CTS.
  • the evaluation results are shown in Table 3.
  • the evaluation of the cross tensile strength (CTS) was A.
  • Table 3 also shows the results of the tensile shear test performed by the same method as described above.
  • the evaluation of TSS was A.
  • the first energization process is performed under the same conditions as described above, and the nugget diameter 16 between the steel sheet 11 and the steel sheet 12 formed by energization of the first energization process by observing the cross section of the joint portion, and between the steel sheet 11 and the aluminum plate 13.
  • Each nugget diameter 17 was determined.
  • the nugget diameter 17 measured the maximum diameter (mm) of the nugget 17 of the aluminum plate 13 in the joint surface of the aluminum plate 13 and the board (steel plate 11) which contact
  • the nugget diameter 16 was determined by measuring the maximum diameter (mm) of the nugget 16 of the aluminum plate 12 at the joint surface between the steel plate 12 and the plate (steel plate 11) in contact with the steel plate 12. The measurement results are shown in Tables 2 and 3.

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  • Mechanical Engineering (AREA)
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Abstract

L'invention concerne un procédé de production d'un joint soudé par points par résistance qui comprend un empilement à trois couches de deux tôles d'acier et d'une feuille d'aluminium. Le procédé permet de produire un joint soudé par points par résistance qui présente une force de joint favorable, indépendamment des éléments et de la combinaison de tôles d'acier et de feuilles d'aluminium. Le procédé consiste à empiler deux tôles d'acier et une feuille d'aluminium de sorte que l'une des feuilles les plus extérieures soit une tôle d'acier et l'autre soit la feuille d'aluminium, et à assembler ensuite l'ensemble de feuilles par soudage par points par résistance. Le procédé comprend : une première étape d'électrification qui est destinée à appliquer un courant en vue de former, entre les deux tôles d'acier, un noyau qui, lorsque l'épaisseur de feuille de la feuille la plus mince parmi les deux tôles d'acier est tFe (mm), présente un diamètre d'au moins 2√tFe (mm) ; une étape de suspension d'électrification qui est destinée à suspendre l'électrification après la première étape d'électrification ; et une seconde étape d'électrification qui est destinée à appliquer un courant après l'étape de suspension d'électrification.
PCT/JP2018/012260 2017-03-31 2018-03-27 Procédé de production d'un joint soudé par points par résistance WO2018181232A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2018530805A JP6399266B1 (ja) 2017-03-31 2018-03-27 抵抗スポット溶接継手の製造方法
KR1020197028629A KR102276817B1 (ko) 2017-03-31 2018-03-27 저항 스폿 용접 조인트의 제조 방법
CN201880022069.0A CN110475642B (zh) 2017-03-31 2018-03-27 电阻点焊接头的制造方法

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JP2017-069475 2017-03-31
JP2017069475 2017-03-31

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WO2018181232A1 true WO2018181232A1 (fr) 2018-10-04

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KR20190126099A (ko) 2019-11-08
JPWO2018181232A1 (ja) 2019-04-04

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