公开(公告)号：US10189111B2

公开(公告)日：2019-01-29

申请号：US14901172

申请日：2014-05-27

Applicant: JFE STEEL CORPORATION

Inventor： Muneo Matsushita ,  Rinsei Ikeda ,  Akihide Yoshitake

IPC: B23K9/28 ,  B23K11/11 ,  B23K11/16 ,  B23K11/30 ,  B23K11/31 ,  B23K101/18 ,  B23K103/04 ,  B23K103/16

Abstract: This indirect spot welding is for welding members including at least two overlapping steel sheets that have a ferrite phase as a main phase by holding a welding electrode (23) against a steel sheet (21) from one side while applying pressure with the electrode (23), attaching a feeding point (24) to a steel sheet (22) at the other side at a location remote from the electrode (23), and allowing current to flow between the electrode (23) and the feeding point (24). This welding includes contacting magnetic rigid bodies (26-1, 26-2) to a peripheral area of the electrode (23) from the one side against which the electrode (23) is held and securing an overlapping region in the peripheral area of the electrode (23) by a magnetic force produced by the rigid bodies (26-1, 26-2), thereby obtaining a weld having fully satisfactory strength, regardless of the rigidity of the members.

公开(公告)号：US20180043461A1

公开(公告)日：2018-02-15

申请号：US15555135

申请日：2016-03-03

Applicant: JFE STEEL CORPORATION

Inventor： Koichi Taniguchi ,  Yasuaki Okita ,  Rinsei Ikeda

IPC: B23K11/24 ,  B23K11/25 ,  B23K11/11

Abstract: A resistance spot welding device for welding at least two overlapping steel sheets held between a pair of welding electrodes is provided. The resistance spot welding device includes the pair of electrodes, an electrode force gauge that measures an electrode force, and a controller that controls an electric current supply to the electrodes according to the electrode force measured by the electrode force gauge. The controller controls the electric current such that the electrode force F measured by the electrode force gauge after the start of the electric current supply is adjusted to a prescribed value.

公开(公告)号：US20180038402A1

公开(公告)日：2018-02-08

申请号：US15554915

申请日：2016-03-03

Applicant: JFE STEEL CORPORATION

Inventor： Koichi Taniguchi ,  Yasuaki Okita ,  Rinsei Ikeda

IPC: F16B5/08 ,  B23K11/16 ,  B23K11/11

CPC classification number: F16B5/08 ,  B23K11/11 ,  B23K11/16 ,  B23K11/163 ,  B23K2101/34 ,  B23K2103/04

Abstract: Provided 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 Fh(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 of 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 Fc(1).

公开(公告)号：US09833861B2

公开(公告)日：2017-12-05

申请号：US15025633

申请日：2014-09-29

Applicant: JFE Steel Corporation

Inventor： Koichi Taniguchi ,  Muneo Matsushita ,  Rinsei Ikeda

IPC: B23K20/12 ,  B23K20/227 ,  C21D9/50 ,  C21D1/42 ,  B23K101/18 ,  B23K103/04

CPC classification number: B23K20/1235 ,  B23K20/1205 ,  B23K20/122 ,  B23K20/1225 ,  B23K20/227 ,  B23K2101/18 ,  B23K2103/04 ,  C21D1/42 ,  C21D9/50 ,  C21D9/505 ,  Y02P10/253

Abstract: A friction stir welding method for welding steel sheets together includes a heating device disposed ahead of a rotating tool in an advancing direction that preheats an unwelded portion before the welding thereof by the rotating tool and at the time of preheating, the surface temperature distribution in a direction perpendicular to the advancing direction in a position at which the welding by the rotating tool is initiated is set such that given that TAc1 is the Ac1 point of a steel sheet, the maximum temperature (TU) thereof is 0.6×TAc1

公开(公告)号：US09821404B2

公开(公告)日：2017-11-21

申请号：US15035809

申请日：2014-12-22

Applicant: JFE STEEL CORPORATION

Inventor： Chikaumi Sawanishi ,  Yasuaki Okita ,  Rinsei Ikeda

IPC: B23K11/10 ,  B23K11/24 ,  B23K11/11 ,  B23K103/04

CPC classification number: B23K11/24 ,  B23K11/115 ,  B23K11/241 ,  B23K35/02 ,  B23K35/0205 ,  B23K2103/04

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×Ix≦Ia

公开(公告)号：US09475147B2

公开(公告)日：2016-10-25

申请号：US14351926

申请日：2012-10-17

Applicant: JFE STEEL CORPORATION

Inventor： Koichi Taniguchi ,  Yasuaki Okita ,  Rinsei Ikeda

IPC: B23K11/00 ,  B23K11/11 ,  B23K11/24 ,  B23K11/25

CPC classification number: B23K11/115 ,  B23K11/24 ,  B23K11/241 ,  B23K11/257

Abstract: Provided is a method of resistance spot welding of welding a sheet set including a high strength steel sheet with which a high joint strength can be achieved even for a high Ceq material. A method of resistance spot welding a sheet set of two or more lapped steel sheets by weld the sheet set while clamping and pressing the sheet set between a pair of welding electrodes includes a first welding step of applying an weld current Im (kA) and forming a nugget having a nugget diameter d (mm) that satisfies the following inequality (1); a cooling step, subsequent to the foregoing first welding, of cooling the sheet set while continuing to press the sheet set; and a second welding step of performing two-step welding, 3×√tm≦d≦6×√tm  (1), where tm is the thickness (mm) of the thinnest one of the foregoing two or more steel sheets.

公开(公告)号：US12151299B2

公开(公告)日：2024-11-26

申请号：US17252728

申请日：2019-06-17

Applicant: JFE STEEL CORPORATION

Inventor： Chikaumi Sawanishi ,  Hiroshi Matsuda ,  Rinsei Ikeda

IPC: B23K11/25 ,  B23K11/11 ,  B23K101/18

Abstract: A resistance spot welding method comprises: performing test welding; and performing actual welding after the test welding, wherein in main current passage in the actual welding, adaptive control welding is performed, and in subsequent current passage in the actual welding, current passage is performed by constant current control with a current determined based on an electrical property between electrodes in each of main current passage in the test welding and the main current passage in the actual welding.

公开(公告)号：US12037665B2

公开(公告)日：2024-07-16

申请号：US17414111

申请日：2019-12-19

Applicant: JFE Steel Corporation

Inventor： Minoru Tanaka ,  Koichi Taniguchi ,  Rinta Sato ,  Katsutoshi Takashima ,  Hiroshi Matsuda ,  Rinsei Ikeda

IPC: C22C38/02 ,  B23K11/00 ,  B23K11/11 ,  B23K11/16 ,  B23K101/18 ,  B23K101/34 ,  B23K103/04 ,  C22C18/04 ,  C22C38/04 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC classification number: C22C38/02 ,  B23K11/0026 ,  B23K11/115 ,  B23K11/166 ,  C22C18/04 ,  C22C38/04 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  B23K2101/18 ,  B23K2101/34 ,  B23K2103/04

Abstract: A spot welded member includes a spot weld formed by holding a sheet stack of multiple steel sheets between a pair of electrodes and spot-welding the sheet stack, in which at least one of the multiple steel sheets is a high-strength zinc-based coated steel sheet having a tensile strength of 780 MPa or more, the high-strength zinc-based coated steel sheet having a coating with an Al content of 0.5% or more by mass, and in which the heat shock region of the spot weld outwardly extending from an edge of a corona bond area includes a coated layer including an FeAl alloy layer having an average thickness of 0.3 μm or more and a zinc-based coated layer having an average thickness of 2.0 μm or more on the FeAl alloy layer at the interface between the base steel sheet of the high-strength zinc-based coated steel sheet and the coating.

公开(公告)号：US20230286077A1

公开(公告)日：2023-09-14

申请号：US18198481

申请日：2023-05-17

Applicant: JFE Steel Corporation

Inventor： Muneo Matsushita ,  Rinsei Ikeda

IPC: B23K20/12

CPC classification number: B23K20/1255 ,  B23K20/126

Abstract: Provided is a double-side friction stir welding method of metal sheets or metal plates to each other, and a double-side friction stir device for performing the double-side friction stir welding. According to the present invention, a pair of rotating tools facing each other is respectively arranged on a top-surface side and a bottom-surface side of a butted portion or an overlapping portion, which comprises a joint portion of two metal sheets or two metal plates, the pair of rotating tools is moved in a welding direction while being rotated at the butted portion or the overlapping portion, and while the metal sheets or the metal plates are softened by frictional heat generated between the rotating tools and the metal sheets or the metal plates, softened parts are stirred by the rotating tools to produce a plastic flow to join the metal sheets or the metal plates to each other.

公开(公告)号：US11498150B2

公开(公告)日：2022-11-15

申请号：US16645789

申请日：2018-08-14

Applicant: JFE STEEL CORPORATION

Inventor： Koichi Taniguchi ,  Reiko Endo ,  Katsutoshi Takashima ,  Hiroshi Matsuda ,  Rinsei Ikeda

IPC: B23K11/16 ,  B23K103/08 ,  B23K103/04 ,  B23K11/11

Abstract: Main current passage and subsequent current passage are performed, with a cooling time of 0.01 s or more being provided between the main current passage and the subsequent current passage. Ip/I which is a ratio of a current value of the subsequent current passage to a current value of the main current passage is controlled to satisfy a predetermined relationship depending on a constant A defined by Mn content and P content of a steel sheet as a part to be welded, in relation to a welding time Tp of the subsequent current passage, a cooling time T, and the constant A.