公开(公告)号：EP3254796A4

公开(公告)日：2018-03-07

申请号：EP16746280

申请日：2016-01-22

Applicant: JFE STEEL CORP

Inventor： MATSUDA HIROSHI ,  OKITA YASUAKI ,  MATSUSHITA MUNEO ,  IKEDA RINSEI ,  OI KENJI

IPC: B23K11/11 ,  B23K11/16 ,  B23K11/34 ,  B32B15/04 ,  C22C38/00 ,  C22C38/60

CPC classification number: B23K11/163 ,  B23K11/11 ,  B23K11/16 ,  B23K11/34 ,  B23K2203/04 ,  B32B15/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/60

Abstract: Provided is an assembly capable of maintaining the necessary strength of a weld in steps of manufacturing the assembly and in use of the assembly. A steel sheet assembly according to the present invention includes a plurality of lapped steel sheets which have a composition containing C: 0.4% or less, Si: 3.0% or less, Al: 3.0% or less, Mn: 0.2% to 6.0%, P: 0.1% or less, and S: 0.07% or less on a mass basis, the remainder being Fe and inevitable impurities, and which have a tensile strength of 1,470 MPa or less and a thickness of 0.3 mm to 5.0 mm, the steel sheet assembly being formed by applying, in advance, an adhesive and a carbon-supplying agent to a surface of either or both of the steel sheets to be lapped and then welding the steel sheets. A weld of the assembly has a nugget diameter of 2.8ˆšt (mm) or more, where t denotes the thickness of a thinner one of the steel sheets on both sides of a weld interface, and the amount of C is increased by 0.02% by mass or more as compared to the steel sheets before being applied with the adhesive and the carbon-supplying agent.

公开(公告)号：EP2783782A4

公开(公告)日：2015-09-23

申请号：EP12851978

申请日：2012-11-06

Applicant: JFE STEEL CORP

Inventor： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA RINSEI

IPC: B23K11/16 ,  B23K11/11

CPC classification number: B23K11/11 ,  B23K11/115 ,  B23K11/16 ,  Y10T403/478

公开(公告)号：EP3266553A4

公开(公告)日：2018-03-21

申请号：EP16758647

申请日：2016-03-03

Applicant: JFE STEEL CORP

Inventor： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA RINSEI

IPC: B23K11/11 ,  B23K11/16 ,  B23K101/34 ,  B23K103/04

CPC classification number: F16B5/08 ,  B23K11/11 ,  B23K11/16 ,  B23K11/163 ,  B23K2201/34 ,  B23K2203/04

Abstract: A resistance spot welding method is provided, which allows a large nugget to be formed while the occurrence of expulsion is prevented. The resistance spot welding method according to the present invention is a method for resistance spot-welding at least two overlapping steel sheets. When an electrode force F after an electric current supply is started changes from an initial electrode force Fi to an electrode force F h (1) while a lapse from the start of the electric current supply is between 20 ms and 80 ms inclusive, a suspension of the electric current supply for from 20 ms to 60 ms inclusive is started. Then the electric current supply is resumed when the electrode force F reaches an electrode force F c (1) .

公开(公告)号：EP3130424A4

公开(公告)日：2017-05-10

申请号：EP15806604

申请日：2015-06-05

Applicant: JFE STEEL CORP

Inventor： SAWANISHI CHIKAUMI ,  OKITA YASUAKI ,  MATSUDA HIROSHI ,  IKEDA RINSEI

IPC: B23K11/24 ,  B23K11/11 ,  B23K11/25 ,  B23K101/00 ,  B23K101/18 ,  B23K103/04

CPC classification number: B23K11/252 ,  B23K11/115 ,  B23K11/257 ,  B23K11/258 ,  B23K2201/006 ,  B23K2201/18 ,  B23K2203/04

Abstract: A nugget of an appropriate diameter is obtained without splashing. A resistance spot welding device that joins predetermined parts to be welded includes: a storage configured to store a time variation of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume in test welding that precedes actual welding; and an adaptive controller and an electrode force controller configured to, in the case where the time variation of the instantaneous amount of heat generated per unit volume in the actual welding differs from a time variation curve stored as the target value, respectively control the current or a voltage during current passage and the electrode force to the parts to be welded to compensate for the difference within a remaining welding time so that the cumulative amount of heat generated per unit volume in the actual welding matches the cumulative amount of heat generated per unit volume stored in the storage.

Abstract translation: 获得适当直径的熔核而不会飞溅。 本发明提供一种电阻点焊装置，其接合预定的被焊接部位，包括：存储部，其存储每单位体积的瞬时发热量和实际焊接前的试验焊接中的每单位体积的累计发热量的时间变化量; 以及自适应控制器和电极力控制器，其被配置为在实际焊接中的每单位体积的瞬时发热量与作为目标值存储的时间变化曲线的时间变化分别控制电流或 电流通过时的电压和对被焊接部分的电极力，以补偿剩余焊接时间内的差异，使得实际焊接中每单位体积产生的累积热量与每单位体积产生的累积热量相匹配 存储在存储器中。

公开(公告)号：EP3088119A4

公开(公告)日：2016-11-02

申请号：EP14874195

申请日：2014-12-22

Applicant: JFE STEEL CORP

Inventor： SAWANISHI CHIKAUMI ,  OKITA YASUAKI ,  IKEDA RINSEI

IPC: B23K11/24 ,  B23K11/11 ,  B23K103/04

CPC classification number: B23K11/24 ,  B23K11/115 ,  B23K11/241 ,  B23K35/02 ,  B23K35/0205 ,  B23K2203/04

Abstract: In a resistance spot welding method, test welding and actual welding in which a current pattern is divided into two or more steps are performed. In the test welding, a constant current of a different value is passed in each step, and a time variation of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume are stored as a target value. In the subsequent actual welding, when a time variation amount of an instantaneous amount of heat generated per unit volume deviates during any step from the results of the test welding, a current passage amount is controlled to compensate for the difference during a remaining welding time in the step. In the test welding, 0.3 x I x ‰¤ I a

公开(公告)号：EP3053693A4

公开(公告)日：2016-08-31

申请号：EP14851320

申请日：2014-09-12

Applicant: JFE STEEL CORP

Inventor： SAWANISHI CHIKAUMI ,  OKITA YASUAKI ,  IKEDA RINSEI

IPC: B23K11/11 ,  B23K11/24

CPC classification number: B23K11/24 ,  B23K11/115 ,  B23K11/166 ,  B23K2201/185 ,  B23K2201/34 ,  B23K2203/04

Abstract: Proposed is a resistance spot welding method to join parts to be welded which are a plurality of overlapping metal sheets, including: dividing a current pattern into two or more steps for welding; before actual welding, performing test welding to store, for each step as a target value, a time variation of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume that are calculated from an electrical property between electrodes when forming an appropriate nugget by passing current with constant current control; and subsequently, as actual welding, starting welding using, as a standard, a time variation curve of the instantaneous amount of heat generated per unit volume obtained by the test welding, and when a time variation amount of an instantaneous amount of heat generated deviates during any step from the time variation curve by a difference, performing adaptive control welding to control a current passage amount in order to compensate for the difference during a remaining welding time in the step so as to match a cumulative amount of heat generated in the actual welding to the cumulative amount of heat generated that is determined in advance in the test welding, in which the two or more steps for welding include a step of securing a current path between the sheets directly below the electrodes and a subsequent step of forming a nugget having a predetermined diameter, and a welding interval time is provided between these steps. This method thus yields a good nugget without causing splashing even under special welding conditions.

Abstract translation: 提出了一种电阻点焊方法，其是将多个重叠金属板接合的待焊接部件，包括：将当前图案分为两个或多个焊接步骤; 在实际焊接之前，进行试验焊接，以每个步骤作为目标值存储每单位体积产生的瞬时热量的时间变化量和由电极之间的电气特性计算的每单位体积的累积热量 当通过恒定电流控制传递电流形成适当的熔核时; 随后，作为实际焊接，作为标准，使用通过试验焊接获得的每单位体积产生的瞬时热量的时间变化曲线，以及当瞬时产生的热量的时间变化量在 通过差异从时间变化曲线的任何步骤，执行自适应控制焊接以控制当前通过量，以便在步骤中的剩余焊接时间期间补偿差异，以便匹配在实际焊接中产生的累积热量 相对于在焊接中预先确定的累积热量，其中两个或更多个焊接步骤包括确保在电极正下方的片材之间的电流路径的步骤，以及随后的形成具有 在这些步骤之间提供预定直径和焊接间隔时间。 因此，即使在特殊的焊接条件下，这种方法也可以产生好的熔核而不引起溅射。

公开(公告)号：JP2014057978A

公开(公告)日：2014-04-03

申请号：JP2012203968

申请日：2012-09-18

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： OKITA YASUAKI ,  IKEDA TOMOMASA

IPC: B23K11/11 ,  B23K11/20

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method by which, in a plate assembly of a large plate thickness ratio formed by laminating a thin plate on at least one of two or more laminated thick plates having a thick plate thickness, a sound joint part between the thin plate-the thick plate and the thick plate-the thick plate can be obtained even if a plate clearance is present between the plates.SOLUTION: A resistance spot welding is performed while the plate assembly formed by laminating a thin plate 11 further on one of two laminated thick plates 12, 13 is sandwiched between a pair of electrodes 16, 17 and welding force is applied to the plate assembly. In this case, a projected part 20 is provided on at least one of the thick plates 12, 13 so that a clearance 33 is formed between the thick plates 12, 13 directly under the electrodes, and resin 14 having no conductivity is interposed between the thick plates 12, 13 and besides, a welding process is divided into first half and second half stages. At the first half stage of welding, a short-time welding is performed by such a low welding force that the resin 14 is not extruded from directly below the electrodes, and the welding is performed by a high welding force enough so that the resin 14 is extruded from directly below the electrodes at the second half stage of welding.

Abstract translation: 要解决的问题：提供一种电阻点焊方法，其中通过在厚度较厚的两层或多层叠厚板中的至少一层上层压薄板而形成的板厚大小的板组件中， 即使在板之间存在板间隙，也可以获得薄板 - 厚板和厚板 - 厚板之间的接合部分。解决方案：在通过层压薄板形成的板组件的同时进行电阻点焊 另外，在两个层压厚板12,13中的一个被夹在一对电极16,17之间，并且焊接力被施加到板组件。 在这种情况下，突出部20设置在至少一个厚板12,13上，使得在电极正下方的厚板12,13之间形成间隙33，并且不具有导电性的树脂14插入在 厚板12,13，此外，焊接工序分为上半部和第二半部。 在焊接的前半段，通过这样低的焊接力进行短时焊接，使得树脂14不从电极的正下方挤出，并且通过足够高的焊接力进行焊接，使得树脂14 在焊接的后半段从电极的正下方挤出。

公开(公告)号：JP2012187639A

公开(公告)日：2012-10-04

申请号：JP2012127627

申请日：2012-06-05

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA TOMOMASA

IPC: B23K11/16 ,  B23K11/11

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method, in resistance spot welding for a parts combination comprising high-strength steel sheets, which solves the conventional problems, and can achieve higher joint strength in a shorter welding time.SOLUTION: In the resistance spot welding method where a parts combination obtained by superimposing two or more steel sheets is held by a pair of welding electrodes, electric current is made to flow while applying pressure, and welding is performed, the method includes at least two steps: a normal energization step where a nugget with a prescribed diameter is formed by energization; and a post-heating energization step where, while inserting the nugget under the pressurizing force same as that in the normal energization step, suspension under 1 to 20 cycles and energization in a short time are performed.

Abstract translation: 要解决的问题：为了提供一种电阻点焊方法，用于解决常规问题的包括高强度钢板的部件组合的电阻点焊，并且可以在较短的焊接时间内实现更高的接合强度。 解决方案：在通过叠加两个或更多个钢板获得的部件组合由一对焊接电极保持的电阻点焊方法中，使电流在施加压力的同时流动并进行焊接，该方法包括 至少两个步骤：正常通电步骤，其中通过通电形成具有规定直径的熔核; 以及后加热通电步骤，其中在与正常通电阶段相同的加压力下插入熔核，在1至20个循环下进行悬浮，并在短时间内通电。 版权所有（C）2013，JPO＆INPIT

公开(公告)号：JP2010115706A

公开(公告)日：2010-05-27

申请号：JP2009238815

申请日：2009-10-16

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA TOMOMASA

IPC: B23K11/11

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method, in resistance spot welding for a parts combination comprising high-strength steel sheets, which solves the conventional problems, and can achieve higher joint strength in a shorter welding time.
SOLUTION: In the resistance spot welding method where a parts combination obtained by superimposing two or more steel sheets is held by a pair of welding electrodes, electric current is made to flow while applying pressure, and welding is performed, the method includes at least following two steps: a normal energization step where a nugget with a prescribed size is formed by energization; and a post-heating energization step where, while inserting the nugget under the pressurizing force same as that in the normal energization step, suspension under 1 to 20 cycles and energization in a short time are performed.
COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：为了提供一种电阻点焊方法，用于解决常规问题的包括高强度钢板的部件组合的电阻点焊，并且可以在较短的焊接时间内实现更高的接合强度。 解决方案：在通过叠加两个或更多个钢板获得的部件组合由一对焊接电极保持的电阻点焊方法中，使电流在施加压力的同时流动并进行焊接，该方法包括 至少按照两个步骤进行：正常通电步骤，其中通过通电形成具有规定尺寸的熔核; 以及后加热通电步骤，其中在与正常通电阶段相同的加压力下插入熔核，在1至20个循环下进行悬浮，并在短时间内通电。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2013078806A

公开(公告)日：2013-05-02

申请号：JP2012286418

申请日：2012-12-28

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： OKITA YASUAKI ,  IKEDA TOMOMASA ,  ONO MORIAKI ,  YASUDA KOICHI

IPC: B23K11/16 ,  B23K11/11

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method enhancing the strength of respective weld joints between a thin plate and a thick plate and between the thick plates even with a gap existing between any steel plates of a plate assembly in the case of carrying out resistance spot welding of the plate assembly with a large plate thickness ratio in which the thin plate is superimposed on one of two or more superimposed thick plates.SOLUTION: A plate assembly workpiece 10 with the thin plate 11 superimposed on two superimposed thick plates 12, 13 is held between a pair of electrodes 21, 22, and while applying pressing force to the plate assembly workpiece 10, a large welding current is applied between the upper and lower electrodes to carry out resistance spot welding. When the gap exists between any steel plates of the plate assembly, the workpiece 10 is fixed, and the electrode 21 on the side abutting on the thin plate 11 is made a fixed electrode of a welding gun, and the electrode 22 on the side abutting on the thick plate 13 is made a movable electrode to carry out welding in two-stage process. In the second process, welding is carried out with larger pressing force than the pressing force in the first process.

Abstract translation: 要解决的问题：为了提供一种提高薄板和厚板之间以及厚板之间的各个焊接接头的强度的电阻点焊方法，即使在板组件的任何钢板之间存在间隙 以大的板厚比进行板组件的电阻点焊的情况，其中薄板叠加在两个或更多个叠加的厚板之一上。 解决方案：具有叠置在两个叠置的厚板12,13上的薄板11的板组件工件10保持在一对电极21,22之间，并且在对板组件工件10施加压力的同时，大的焊接 上下电极之间施加电流，进行电阻点焊。 当在板组件的任何钢板之间存在间隙时，工件10被固定，并且抵靠薄板11的一侧的电极21被制成焊枪的固定电极，并且电极22的一侧抵靠 在厚板13上形成可动电极，以两段工序进行焊接。 在第二工序中，以比第一工序中的按压力更大的压力进行焊接。 版权所有（C）2013，JPO＆INPIT