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公开(公告)号：US20160008913A1
公开(公告)日：2016-01-14
申请号：US14770592
申请日：2014-01-24
Applicant: JFE STEEL CORPORATION
Inventor： Yasuaki OKITA , Chikaumi SAWANISHI , Rinsei IKEDA , Kenji OI
CPC classification number: B23K11/115 , B23K11/24
Abstract: Proposed is a method of resistance spot welding to join 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; 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.
Abstract translation: 提出了一种电阻点焊接合多个重叠金属片的方法，包括：将当前图案划分为两个或更多个焊接步骤; 在实际焊接之前，进行试验焊接，以每个步骤为目标值存储每单位体积产生的瞬时热量的时间变化和每单位体积产生的累积热量; 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 从时间变化曲线的差值的任何步骤，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。
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公开(公告)号：US20210252629A1
公开(公告)日：2021-08-19
申请号：US16973766
申请日：2019-06-17
Applicant: JFE STEEL CORPORATION
Inventor： Chikaumi SAWANISHI , Hiroshi MATSUDA , Rinsei IKEDA
Abstract: A resistance spot welding method comprises: performing test welding; and performing actual welding after the test welding, wherein in the test welding, 0.2≤Vtp/Vtm≤1.5 is satisfied where Vtm is an average value of a voltage between the electrodes in main current passage in the test welding and Vtp is an average value of a voltage between the electrodes in subsequent current passage in the test welding, and in each of main current passage and subsequent current passage in the actual welding, a time variation curve of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume that are stored in a corresponding one of the main current passage and the subsequent current passage in the test welding are set as a target, and adaptive control welding is performed to control a current passage amount according to the target.
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公开(公告)号：US20200306871A1
公开(公告)日：2020-10-01
申请号：US16089217
申请日：2017-03-22
Applicant: JFE STEEL CORPORATION
Inventor： Muneo MATSUSHITA , Rinsei IKEDA , Koichi TANIGUCHI
Abstract: An object is to provide a friction stir welding method and apparatus that provide sufficient strength and good welding workability by advantageously eliminating plastic flow deficiency generated as a result of insufficient heating of workpieces.In friction stir welding for steel sheets (3,3) as workpieces, a pair of facing rotary tools (1,15) are inserted into a non-welded part from both one surface side and the other surface side of the steel sheets (3,3), the rotary tools move in a welding direction while rotating, and in addition, a preheating process for heating steel sheets (3,3) is performed by heating means (5) provided in front of the rotary tools (1,15). The configuration of the pair of facing rotary tools (1,15) and the surface temperature, area, position, and so forth of a heated region in the preheating process are strictly controlled.
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公开(公告)号：US20190161822A1
公开(公告)日：2019-05-30
申请号：US16320864
申请日：2017-08-10
Applicant: JFE STEEL CORPORATION
Inventor： Katsutoshi TAKASHIMA , Koichi TANIGUCHI , Takashi KOBAYASHI , Hiroshi MATSUDA , Rinsei IKEDA
IPC: C21D9/46 , C21D8/02 , C22C38/38 , C22C38/12 , C22C38/08 , C22C38/22 , C22C38/00 , C22C38/26 , C22C38/24 , C22C38/28 , C22C38/14 , C22C38/32 , C22C38/06 , C22C38/04 , C22C38/02 , C23C2/02 , C23C2/06 , C23C2/28
Abstract: A high-strength steel sheet having a specified chemical composition and a method for producing the same. The steel sheet including a multi-phase structure including, by volume fraction, ferrite of 35% to 65%, residual austenite of 7% or less (including 0%), martensite of 20% to 60%, bainite of 20% or less (including 0%), the ferrite having an average crystal grain size of 8 μm or less and an average aspect ratio of 3.5 or less, the martensite having an average crystal grain size of 3 μm or less, and the bainite having an average crystal grain size of 3 μm or less when contained. A standard deviation of Vickers hardness of the steel sheet being 30 or less when measured at 200 μm intervals from a position of 100 μm from a surface to a central portion in a thickness direction of the sheet.
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公开(公告)号：US20210260684A1
公开(公告)日：2021-08-26
申请号：US17252276
申请日：2019-06-17
Applicant: JFE STEEL CORPORATION
Inventor： Chikaumi SAWANISHI , Hiroshi MATSUDA , Rinsei IKEDA
Abstract: A resistance spot welding method comprises: performing test welding; and performing actual welding after the test welding, wherein in subsequent current passage in the test welding, current passage is performed by constant current control under a condition: 0.5≤Vtp/Vtm≤2.0 when tc
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Patent Agency Ranking
公开(公告)号：US20210023646A1
公开(公告)日：2021-01-28
申请号：US16635165
申请日：2018-08-02
Applicant: JFE STEEL CORPORATION
Inventor： Chikaumi SAWANISHI , Hiroshi MATSUDA , Rinsei IKEDA
Abstract: A resistance spot welding method comprises: performing test welding; and performing actual welding after the test welding. The test welding is performed under each of two or more welding conditions. In the actual welding, preliminary current passage is performed by constant current control in the same current pattern as in the preliminary current passage of the test welding, an electrical property between the electrodes in the preliminary current passage in the actual welding and an electrical property between the electrodes stored in the preliminary current passage in the test welding are compared for each welding condition to set a target in main current passage in the actual welding, and thereafter adaptive control welding is performed to control a current passage amount as the main current passage.
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公开(公告)号：US20170312846A1
公开(公告)日：2017-11-02
申请号：US15526125
申请日：2015-11-18
Applicant: JFE STEEL CORPORATION
Inventor： Chikaumi SAWANISHI , Yasuaki OKITA , Hiroshi MATSUDA , Rinsei IKEDA
Abstract: The resistance spot welding method includes performing actual welding to squeeze, by a pair of electrodes (14), a sheet combination with a sheet thickness ratio of more than 3 in which a thin sheet (11) is overlapped on at least one face of two or more overlapping thick sheets (12, 13), and passing a current while applying an electrode force to join the sheet combination, wherein in the actual welding, a pattern of the current and the electrode force is divided into two or more steps including a first step and a second step to perform welding, and an electrode force F1 in the first step and an electrode force F2 in the second step satisfy a relationship F1>F2.
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公开(公告)号：US20160236294A1
公开(公告)日：2016-08-18
申请号：US15024164
申请日：2014-09-12
Applicant: JFE STEEL CORPORATION
Inventor： Chikaumi SAWANISHI , Yasuaki OKITA , Rinsei IKEDA
CPC classification number: B23K11/24 , B23K11/115 , B23K11/166 , B23K2101/185 , B23K2101/34 , B23K2103/04
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; and subsequently, as actual welding, performing adaptive control 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; 实际焊接前，进行焊接试验; 随后，作为实际焊接，执行自适应控制焊接，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形成具有预定直径的熔核的后续步骤，以及 在这些步骤之间提供焊接间隔时间。 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。
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9.发明申请公开(公告)号：US20200215644A1
公开(公告)日：2020-07-09
申请号：US16637906
申请日：2018-09-12
Applicant: JFE STEEL CORPORATION
Inventor： Muneo MATSUSHITA , Rinsei IKEDA
IPC: B23K20/12
Abstract: There is provided a friction stir welding method in which, when double-sided friction stir welding is performed, enough plastic flow to obtain a welded state uniform in the thickness direction of metal sheets can be obtained, in which an increase in welding speed is achieved while the occurrence of defects during welding is prevented, and in which sufficient strength and improvement in welding workability can be achieved. There is also provided a friction stir welding device suitable for the friction stir welding.
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公开(公告)号：US20180043466A1
公开(公告)日：2018-02-15
申请号：US15556792
申请日：2016-03-17
Applicant: JFE STEEL CORPORATION
Inventor： Muneo MATSUSHITA , Koichi TANIGUCHI , Rinsei IKEDA
IPC: B23K20/12
CPC classification number: B23K20/1235 , B23K20/12 , B23K20/1225 , B23K20/1245
Abstract: A friction stir welding apparatus that includes a rotary tool and a heating device. The heating device is placed in front of the rotary tool to heat steel sheets that are used as a workpiece. The rotary tool is moved in the welding direction so that steel sheet is softened by frictional heat. Additionally, the surface temperature, the area, and the position of the heated region during the heating process are strictly controlled. The heating of the steel sheets by the welding apparatus provides sufficient strength and good welding workability by advantageously eliminating plastic flow defects generated due to insufficient heating of workpieces.
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