WO2019124465A1 - Procédé de fabrication d'un joint soudé par points par résistance - Google Patents

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

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Publication number
WO2019124465A1
WO2019124465A1 PCT/JP2018/046881 JP2018046881W WO2019124465A1 WO 2019124465 A1 WO2019124465 A1 WO 2019124465A1 JP 2018046881 W JP2018046881 W JP 2018046881W WO 2019124465 A1 WO2019124465 A1 WO 2019124465A1
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Prior art keywords
energization
current
steel plate
electrode
main
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PCT/JP2018/046881
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English (en)
Japanese (ja)
Inventor
古迫　誠司
泰山　正則
智伸 三浦
朋紀 柳川
Original Assignee
日本製鉄株式会社
豊田鉄工株式会社
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Priority to JP2019520162A priority Critical patent/JP6584729B1/ja
Publication of WO2019124465A1 publication Critical patent/WO2019124465A1/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
    • 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
    • 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
    • B23K11/24—Electric supply or control circuits therefor
    • 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 of manufacturing a resistance spot welded joint of a steel plate.
  • An automobile body is assembled by joining press-formed steel plates mainly by spot welding using resistance welding.
  • spot welding coexistence of securing of the nugget diameter according to plate thickness, and suppression of a dust (dispersion) is called for.
  • Patent Document 1 adopts spot welding of high-tensile steel plates by adopting a two-step energization method in which main energization is performed after improving the familiarity of contact surfaces of steel plates by preliminary energization.
  • a spot welding method is disclosed that suppresses the occurrence of dust.
  • Patent Document 2 after forming a nugget having a diameter of 3 t t to 5 t t by pre-energization, the current value is lowered, and then the current value is increased again to perform a constant current main energization or a pulsed main current
  • the spot welding method which suppresses generation
  • Patent Document 3 discloses a hot stamp steel plate covered with a film having high electrical resistance such as zinc oxide.
  • spot welding preliminary electrification is performed by pulsating electrification that repeats the electrification and electrification stop several times while pressurizing the steel plate with the welding electrode, and thereafter, the current is continuously applied longer than the maximum electrification time at the time of pulsating electrification
  • a spot welding method is disclosed which is adapted to be energized.
  • Patent Document 4 when spot welding the same steel plate as in Patent Document 3, preliminary energization and main energization are performed by pulsation energization, and the maximum current of the main energization is conducted higher than the maximum current of the preliminary energization.
  • a spot welding method is disclosed.
  • vibration due to thermal expansion and contraction is given to the electrode contact surface of the steel sheet by repetition of energization and energization suspension at the time of pulsation energization of pre-energization, and high melting point
  • the oxide layer can be effectively eliminated to the outside of the welded portion, and the rapid cooling of the welded portion can be suppressed by sufficiently exerting the cooling effect of the electrode by stopping the energization of the pulsation electric current. For this reason, it is possible to obtain the effect of improving the familiarity of the contact surfaces of the steel plates in a short time while suppressing the generation of dust, and suppressing an increase in current density at the contact interface to suppress rapid nugget growth. Can. As a result, generation of dust in spot welding of a hot stamped steel sheet can be suppressed.
  • the nugget diameter is secured while suppressing the occurrence of indentation by setting the pressing force of the electrode in an appropriate range according to the plate thickness of the steel plate and further setting the energization pattern in an appropriate range.
  • a spot welding method is disclosed to prevent the occurrence of spattering.
  • steel plates used for hot stamping are often subjected to surface treatments such as zinc-based plating and aluminum-based plating.
  • surface treatments such as zinc-based plating and aluminum-based plating.
  • oxidation of the plating proceeds during heating to form an oxide layer such as zinc oxide or aluminum oxide.
  • oxide layers grow, the contact resistance of the steel plate after hot stamping (hot stamped steel plate) rises to 1 m ⁇ or more.
  • spot assembly welding of a car body or the like using such a hot stamped steel plate there is also a problem that the generation of dust becomes easy and it becomes difficult to ensure the stability of the nugget diameter.
  • the high melting point oxide layer is formed of a welded portion by the action of pulsating current (current passing and current stopping repeated several times in a short time) using a welding power source of inverter direct current.
  • pulsating current current passing and current stopping repeated several times in a short time
  • inverter direct current current passing and current stopping repeated several times in a short time
  • the effect may not be sufficient, for example, when the oxide layer is thick, and even in such a case, it is desirable that generation of dust can be further suppressed.
  • the inverter direct current which has recently become mainstream because of advantages such as small current, has a narrower appropriate current range than alternating current as disclosed in Patent Document 4.
  • Patent Document 5 secures the nugget diameter and suppresses the generation of dust by changing the pressing force according to the plate thickness and setting the energization pattern in an appropriate range.
  • the layer is thick, the effect may not be sufficient. Even in such a case, it is desirable that the generation of dust can be further suppressed.
  • a manufacturing method of a resistance spot welded joint in which two or more steel plates are stacked, and the stacked portion is pressurized by an electrode and energized, the tip portion has a convex curved surface, and the curved surface
  • a method of manufacturing a resistance spot welded joint comprising: a main energization step after the preliminary energization step; and a current in the preliminary energization step and the main energization step is all direct current.
  • a welding method capable of suppressing dust and stably securing the nugget diameter against spot welding of a steel plate in which a substance having a high electrical resistance is present in the surface layer like a hot stamped steel plate.
  • “appropriate current range” refers to the first current at which the nugget diameter is 4 ⁇ t or more, where t is an average value of the plate thicknesses of the steel plates to be spot welded by gradually increasing the current.
  • it is a range from “4 t t current” to the current where dust is generated for the first time.
  • the surface-treated hot stamped steel plate an intermetallic compound and an iron-based solid solution are formed on the surface by an alloying reaction of a plated metal and a steel base, and a metal derived from plating (for example, It has an oxide film which has Zn as a main component. Therefore, compared with a cold pressed steel plate, the surface-treated hot stamped steel plate has a high resistance at the contact portion between the steel plates and a large amount of heat generation.
  • alloying between the plated metal and the steel proceeds in the hot stamping process, and the melting point in the vicinity of the surface also has a high value close to that of iron. Is hard to soften and expansion of the current-carrying path is suppressed.
  • the heat generation efficiency is higher in the inverter DC system energization than in the single-phase alternating current, the formation of the nugget at the initial stage of the energization becomes very rapid. For this reason, it is estimated that the growth of the pressure contact portion around the nugget can not catch up and the molten metal can not be confined and dust is generated.
  • direct current does not have a current pause time like single-phase alternating current, it is difficult to obtain a cooling effect by the electrode. For this reason, it is presumed that the nugget easily grows in the thickness direction, the melted portion reaches the outermost layer of the steel plate, and surface dust is generated.
  • "direct current” does not include energization that reverses plus / minus like alternating current. For this reason, not only energization in which current is always flowing as in continuous energization, but also pulsation energization in which energization and energization suspension are repeated a plurality of times in a short time is determined as direct current unless plus / minus reversal occurs.
  • the present inventors examined means for dividing the oxide layer and reliably excluding it on the outside of the welded portion regardless of the thickness of the oxide layer and the like at the time of pre-energization of spot welding by two-step current application.
  • the inventors of the present invention overlap two hot-stamped galvanized steel sheets (hot stamped steel sheets) having a thickness of 1.4 mm and perform spot welding on the basis of one-stage electrification and preliminary electrification of the main electrification only.
  • spot welding with a target nugget diameter of 5.9 mm, with two stages of main energization and spot welding, the occurrence of dust when the curvature of the electrode tip was changed was investigated. The number of tests was 40 each.
  • an energization pattern is used in which a pre-energization is performed with a current value Ia: 3.5 kA and an energization time ta: 0.4 sec, followed by main energization.
  • the electrode is of a DR (dome radius) type in which the tip end portion which is the initial contact portion at the time of pressing is a convex curved surface as shown in FIG. 3, the diameter d of the tip curved portion is 6 mm, and the curvature radius
  • the (tip R) used ones of 100 mm, 40 mm, and 15 mm.
  • the pressure applied during energization was 500 kgf (4.9 kN).
  • FIG. 1 shows the test results of the number of dust generation in each case.
  • the number of generated dusts is reduced by welding by two-step energization, as compared to spot welding by one-step energization.
  • the number of dust generation is greatly reduced if an electrode with a small radius of curvature at the tip is used in addition to the pre-energization.
  • the present inventors further change the radius of curvature of the tip of the electrode and the energization condition of the preliminary energization on the premise that the energization is performed in two stages of the preliminary energization and the main energization.
  • the curvature radius of the electrode tip is 30 mm or less. It has been found that the appropriate welding current range for obtaining the required nugget diameter is expanded without generation.
  • the present invention heats a raw steel plate (for example, an electroplated steel plate or a thin steel plate containing a hot-dip galvanized steel plate) made of high strength steel to a hardenable temperature and austenitizes it, and then simultaneously press-molds it with a die.
  • a hardened, hot-stamped steel plate (hereinafter referred to as “hot stamped steel plate”), which has surface treatments such as zinc-based plating, aluminum-based plating, etc., to prevent iron scale formation when heated to high temperatures.
  • Hot-stamped hot-stamped steel plates are mainly targeted for spot welding using the applied material steel plates.
  • the present invention is also applicable to steel plates other than hot stamped steel plates, and is not particularly limited to hot stamped steel plates.
  • a hot stamped steel plate is not a flat plate but a formed body that has been formed and processed. However, since it is sufficient if the portion to be overlapped is a plate, in the present invention it is It is called "hot stamped steel plate” including.
  • a hot stamped steel plate obtained by hot stamping a zinc-based plated steel plate or an aluminum-based plated steel plate may be referred to as “surface-treated hot stamped steel plate” in the following description.
  • an intermetallic compound and an iron-based solid solution are formed on the surface by an alloying reaction between a zinc-based or aluminum-based plated film and the steel of the base material, and the outer surface is further derived from plating. It has an oxide layer containing a metal (for example, zinc in the case of zinc-based plating) as a main component. Therefore, the surface-treated hot stamped steel plate has a contact resistance as high as 1 m ⁇ or more as compared to a bare steel plate, and a large amount of heat is generated by energization.
  • the alloying of the plating and the steel proceeds in the hot stamping process, and the melting point in the vicinity of the surface also has a high value close to iron, so compared to the steel plate provided with the plated film before heating ,
  • the contact portion between the steel plates is difficult to soften.
  • the present invention is particularly effective when applied to spot welding of a steel plate having such contact resistance of 1 m ⁇ or more.
  • the measuring method of contact resistance is mentioned later.
  • the thickness of the steel plate there is no particular limitation on the thickness of the steel plate.
  • the thickness of a steel plate used in automobile parts or vehicle bodies is 0.6 to 3.2 mm, and the method for producing a spot welded joint of the present invention has a sufficient effect in this range.
  • At least one of the steel plates on the side to which the electrode contacts includes a surface-treated hot stamped steel plate.
  • a steel plate combined with a surface treatment hot stamp steel plate a combination including a surface treatment hot stamp steel plate and a high tensile steel plate of 590 MPa grade or more is preferable.
  • resistance spot welding is performed on a plate assembly in which two or three steel plates are stacked.
  • the surface area of the tip surface of the electrode having a radius of curvature of 10 mm or more is the same as the electrode pressing direction (usually the electrode length method)
  • the area A of the region projected on a plane perpendicular to the above and the diameter of a circle equivalent to the area are defined as the electrode tip diameter d. That is, the electrode tip diameter d is calculated as 2 ⁇ (A / ⁇ ).
  • the surface area with a radius of curvature of 40 mm or more is projected onto a plane perpendicular to the pressing direction of the electrode (usually the same as the electrode length method). If the area is circular, the diameter of the circle is the electrode tip diameter d.
  • the radius of curvature (tip R) of the curved surface of the electrode tip is 30 mm or less. It is preferable that it is 20 mm or less. Although a minimum is not specifically limited, In order to ensure a contact area with a steel plate, it shall be about 10 mm.
  • the surface pressure of the electrode tip acting on the steel plate is increased, and the effect of dispersing and moving the oxide on the surface of the steel plate is increased, that is, the contact resistance of the steel plate is made efficient.
  • the diameter d of the curved surface of the electrode tip is not particularly limited, but is preferably 4 to 6 mm.
  • chromium copper or alumina-dispersed copper is preferable, but alumina-dispersed copper is more preferable from the viewpoint of preventing welding and surface dust.
  • the current in spot welding is conducted using a DC welding power source such as an inverter DC system.
  • the inverter direct current method has a merit that it can be mounted on a robot with a small load and can be made small, and therefore it is used in particular in automation lines.
  • the inverter direct current method does not have current on / off like the single-phase alternating current method conventionally used, and continuously applies the current, so the heat generation efficiency is high.
  • the basic example of the electricity supply pattern in spot welding is shown by a time chart in FIG.
  • a pre-energization is conducted to apply a current pressure Ia while applying a predetermined pressurizing force, and then a current is applied at a current value Ib to perform main energization so that the nugget has a predetermined diameter.
  • Ib is preferably higher than Ia. Then, after completion of the main conduction, when the predetermined hold time has elapsed, the electrode is separated from the steel plate to release the pressure.
  • the electrode and the steel plate surface are brought into contact with each other under high contact pressure to disperse the oxide layer on the steel plate surface, and a part of the oxide is moved (excluded) outside the contact area of the electrode. Reduce surface contact resistance. In addition, the current value is lowered to suppress the rapid growth of nuggets at the initial stage of contact and to prevent the generation of dust.
  • the pre-energization current value Ia is set to 6 kA or less. Under such conditions, the contact resistance on the surface of the steel sheet can be reduced without generating dust.
  • the energization time in the pre-energization is equal to or longer than the time which can destroy the oxide layer of the portion of the steel plate surface in contact with the electrode and partially exclude it from the contact range. Specifically, electricity is applied for ta (sec) so as to satisfy the following equations (1) and (2).
  • Ia (t) (kA) in a formula (1) and a formula (2) is a current value of preliminary energization at the time of t (sec) progress from a preliminary energization start.
  • the current integral value S in the pre-energization defined by the following equation (3) is set to 0.5 kA ⁇ s or more as shown in the equation (2).
  • the lower limit of the current integral value S may be 0.6 kA ⁇ s, 0.8 kA ⁇ s, 1.0 kA ⁇ s or 1.2 kA ⁇ s.
  • the energization time of the pre-energization process it is often 0.05 to 1 s.
  • the lower limit of the current application time may be 0.1 s, 0.15 s, or 0.2 s.
  • the upper limit may be 0.9s, 0.8s, 0.7s or 0.8s.
  • the current in the preliminary energization (the maximum value of the current in the preliminary energization when the current fluctuates during the preliminary energization) is 6 kA or less.
  • the lower limit is 0 kA in consideration of the pulsation energization. If necessary, it may be 1 kA or 2 kA.
  • the pressure is preferably 2.9 kN or more. Preferably it is 3.4 kN or more. More preferably, it is 3.5 kN or more, 3.8 kN or more, 4.0 kN or more, or 4.4 kN or more.
  • the pressing force is preferably 10 kN or less, 9.5 kN or less, or 9.0 kN or less because the nugget formation during main conduction may be difficult due to a decrease.
  • the main purpose is to destroy and separate the oxide layer of the part in contact with the electrodes on the surface of the steel plate and the part where steel plates are in contact with each other, and move a part out of the contact range. It is not necessary to form a nugget.
  • the generation of dust can be significantly reduced, so a steel plate having a high surface electrical resistance value.
  • the required nugget diameter can be stably secured.
  • the range of the current for the main conduction may be 1.0 to 10.0 kA except in the case of the pulsation current.
  • the lower limits may be set to 2.0 kA, 3.0 kA, 5.5 kA, 6.0 kA, and 6.5 kA.
  • the upper limit may be 12.0 kA, 11.5 kA, 11.0 kA, 10.5 kA or 10.0 kA.
  • the lower limit of the current is 0 kA in consideration of the energization of pulsation.
  • the maximum value of the current value of the main energization is usually larger than the maximum value of the preliminary energization.
  • the energization pattern the pattern shown in FIG. 2 in which the preliminary energization and the main energization are continuously conducted at a constant current value has been described as an example, but the current value is gradually increased instead of the constant current value. It can be done.
  • the gradual increase of the current value may be continuous or stepwise.
  • FIG. 4A shows an example in which the current is gradually and gradually increased at the initial stage of the preliminary energization, that is, the up-slope energization is performed.
  • the solid line shows the example from the beginning, and the broken line shows an example in which up-slope conduction is performed from the current value in the middle.
  • FIG. 4 (b) shows an example in which the current is gradually increased at an early stage of the main conduction
  • FIG. 4 (c) shows an example in which the current is gradually increased during the main conduction. It shows each.
  • the main energization may be pulsating energization repeating a cycle of the energization and the energization suspension.
  • the pulsation energization it is desirable because the rapid temperature rise of the weld during the main energization can be suppressed by the energization stop, and the generation of dust can be suppressed as compared to the continuous energization.
  • the maximum current value of pulsation energization is set to a value larger than the pre-energization current value.
  • the pulsation energization for example, an energization method in which a cycle in which one cycle is paused after three cycles of energization is repeated is exemplified.
  • the 1st period of pulsation electricity supply is continuously supplied with preparatory electricity supply in FIG. 5, it is also possible to start the electricity supply of the 1st cycle after an idle period. Furthermore, the maximum current can also be increased stepwise.
  • a condition in which a nugget of a predetermined diameter is obtained without generating dust is adopted.
  • a nugget diameter of 4 ⁇ t or more is often used as a production control standard.
  • the definition of the pre-energization and the main energization is as follows.
  • the measuring method of contact resistance is shown in FIG.
  • a steel plate (which may or may not be plated) is sandwiched between one spot welding electrode.
  • a current I of 1 A is supplied to the electrode.
  • the voltage V1 between the upper electrode 1a and the steel plate 2 and the voltage V2 between the lower electrode 1b and the steel plate 2 are measured.
  • the electric resistance between the upper electrode and the steel plate is R1
  • the electric resistance between the lower electrode and the steel plate is R3
  • the resistance due to the specific resistance of the steel plate bulk (base material) itself is R2.
  • R2 can be approximated to zero.
  • the resistance of the upper and lower electrodes can be approximated to zero. Therefore, the relationship between the measured voltages V1 and V2 and the electrical resistances R1 and R3 can be approximated as follows.
  • the larger one of R1 and R3 is used as the contact resistance in the present invention.
  • a steel plate having a contact resistance of 1 m ⁇ or more is mainly applied, but the present invention is applicable to a steel plate having a contact resistance of less than 1 m ⁇ , and it is not necessary to be limited to a steel plate having a contact resistance of 1 m ⁇ or more.
  • the lower limit of the contact resistance may be limited to 2 m ⁇ , 5 m ⁇ , 8 m ⁇ or 10 m ⁇ .
  • the upper limit of the contact resistance is not particularly limited, but may be 100 m ⁇ , 50 m ⁇ , 30 m ⁇ , or 20 m ⁇ .
  • GA plating hot stamp steel plate of 1500MPa class of 2.0mm thickness (coating adhesion amount before hot stamping: 55g / m 2 per one side, heating condition: 900 ° C for 4 minutes using a servo pressure type inverter DC spot welding machine) Two pieces of the test piece prepared from heating were piled up and resistance spot welding was performed.
  • the shape of the test piece was a strip having a width of 30 mm and a length of 50 mm. When the contact resistance of the steel plate was measured by the above method, it was all 12 m ⁇ .
  • As the electrode a DR type electrode (chromium copper) having a diameter d of the tip curved surface of 6 mm and a radius of curvature (tip R) of 15 to 100 mm was used.
  • the welding conditions are shown in Table 1.
  • the current value of the main conduction was a current value until 4 kA generated dust. All power supplies were inverter DC power supplies.
  • the current value in the main-energization step was changed to investigate the nugget diameter and the occurrence of dust.
  • the thickness, strength (tensile strength), welding conditions, and test results (appropriate current range of the main conduction step) of the test steel plate in each test number are also shown in Table 1.
  • a sufficient proper current range from 4 t t current to 4 t t current + 1.5 kA or more can be obtained, and by setting the current value of the main conduction step to a value less than dust generation current, Even in the welding of actual parts, it is possible to stably secure a spot welded portion having a nugget diameter of 4 ⁇ t or more even when there is a disturbance due to shunting or electrode wear, without generating dust.
  • the appropriate current range did not satisfy the target of 1.5 kA or more.

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Abstract

L'invention concerne un procédé pour fabriquer un joint soudé par points, selon lequel la génération d'expulsion peut être supprimée lorsqu'un soudage par points est effectué sur une tôle d'acier comportant au moins une tôle d'acier d'estampage à chaud. Selon le procédé, lorsque deux tôles d'acier ou plus sont superposées l'une sur l'autre et qu'un soudage par points par résistance est effectué sur la partie superposée obtenue, une électrode dont la partie d'extrémité avant présente une surface incurvée en saillie, le rayon de courbure de la surface incurvée n'étant pas supérieur à 30 mm, est utilisée, et le soudage par points par résistance est effectué au moyen d'une conduction en deux étapes, comprenant une conduction préliminaire à un courant Ia(t) (kA) pour une période de temps ta (sec) et une conduction principale. Les courants pour la conduction préliminaire et la conduction principale sont des courants directs, et Ia(t) and ta (sec) satisfont Ia(t) ≤ 6,0 (kA) et la formule (AA).
PCT/JP2018/046881 2017-12-19 2018-12-19 Procédé de fabrication d'un joint soudé par points par résistance WO2019124465A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021079410A (ja) * 2019-11-20 2021-05-27 トヨタ自動車株式会社 抵抗スポット溶接方法
CN114850643A (zh) * 2021-02-04 2022-08-05 杭州宝伟汽车零部件有限公司 超高强度热成形钢板点焊方法

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JP2010207909A (ja) * 2009-02-12 2010-09-24 Sumitomo Metal Ind Ltd 高張力鋼板の抵抗溶接方法および抵抗溶接継手の製造方法
JP2013063470A (ja) * 2009-01-29 2013-04-11 Jfe Steel Corp インダイレクトスポット溶接方法
WO2015170687A1 (fr) * 2014-05-07 2015-11-12 新日鐵住金株式会社 Procédé de soudage par points
WO2016088319A1 (fr) * 2014-12-01 2016-06-09 Ｊｆｅスチール株式会社 Procédé de soudage par points par résistance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008161878A (ja) * 2006-12-27 2008-07-17 Nippon Steel Corp 重ね抵抗スポット溶接方法
JP2013063470A (ja) * 2009-01-29 2013-04-11 Jfe Steel Corp インダイレクトスポット溶接方法
JP2010207909A (ja) * 2009-02-12 2010-09-24 Sumitomo Metal Ind Ltd 高張力鋼板の抵抗溶接方法および抵抗溶接継手の製造方法
WO2015170687A1 (fr) * 2014-05-07 2015-11-12 新日鐵住金株式会社 Procédé de soudage par points
WO2016088319A1 (fr) * 2014-12-01 2016-06-09 Ｊｆｅスチール株式会社 Procédé de soudage par points par résistance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021079410A (ja) * 2019-11-20 2021-05-27 トヨタ自動車株式会社 抵抗スポット溶接方法
JP7201569B2 (ja) 2019-11-20 2023-01-10 トヨタ自動車株式会社 抵抗スポット溶接方法
CN114850643A (zh) * 2021-02-04 2022-08-05 杭州宝伟汽车零部件有限公司 超高强度热成形钢板点焊方法

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