公开(公告)号：US12194562B2

公开(公告)日：2025-01-14

申请号：US16980098

申请日：2019-03-20

Applicant: JFE Steel Corporation

Inventor： Muneo Matsushita ,  Rinsei Ikeda ,  Hiroshi Matsuda ,  Daiki Yamagishi

IPC: B23K20/00 ,  B23K20/12

Abstract: Disclosed are rotating tools for double-sided friction stir welding that are applied to double-sided friction stir welding, which is a technique for welding two metal plates by rotating a pair of rotating tools, which oppose each other, in opposite directions, a double-sided friction stir welding apparatus that uses the rotating tools, and a double-sided friction stir welding method. A pair of rotating tools for double-sided friction stir welding that are used in double-sided friction stir welding, which is a technique for welding metal plates by using a pair of rotating tools that are each disposed on one of first and second surfaces of an unwelded portion of the metal plates such that the rotating tools rotate in opposite directions, include end portions each of which is formed in a circular and planar shape. The end portions are each made of a material harder than the metal plates.

公开(公告)号：US11992892B2

公开(公告)日：2024-05-28

申请号：US16967193

申请日：2019-02-05

Applicant: JFE Steel Corporation

Inventor： Reiko Endo ,  Muneo Matsushita ,  Koichi Taniguchi ,  Hiroshi Matsuda ,  Rinsei Ikeda

IPC: B23K11/11 ,  B23K11/16 ,  B23K11/24 ,  B23K101/00 ,  B23K101/18 ,  B23K103/04 ,  C21D6/00 ,  C21D9/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC classification number: B23K11/115 ,  B23K11/16 ,  B23K11/24 ,  C21D6/004 ,  C21D9/50 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  B23K2101/006 ,  B23K2101/18 ,  B23K2103/04

Abstract: The present invention provides a resistance spot welding method. A resistance spot welding method according to the present invention in which a sheet combination of two or more overlapping steel sheets is sandwiched between a pair of electrodes and joined together by applying current while applying pressure, the method including a main current application step in which current application is performed with a current Iw (kA), and subsequently, a post-tempering heat treatment step in which after cooling is performed for a cooling time tct (ms) shown in formula (1) below, current application is performed with a current It (kA) shown in formula (2) below for a current application time tt (ms) shown in formula (3) below: 800≤tct . . . formula (1), 0.5×Iw≤It≤Iw . . . formula (2), and 500≤tt . . . formula (3).

公开(公告)号：US11168378B2

公开(公告)日：2021-11-09

申请号：US15551375

申请日：2016-03-03

Applicant: JFE STEEL CORPORATION

Inventor： Yasuaki Okita ,  Rinsei Ikeda ,  Seiji Nakajima ,  Koichi Nakagawa

IPC: C21D9/50 ,  B23K9/167 ,  C23C2/06 ,  C23C2/40 ,  C22C38/60 ,  B23K26/21 ,  B23K26/348 ,  B23K31/00 ,  C21D9/00 ,  B23K9/23 ,  C22C18/00 ,  C21D1/18 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  B21D22/20 ,  B23K9/16 ,  B23K10/02 ,  C22C18/04 ,  B23K103/08 ,  B21D53/88

Abstract: A hot-pressed member is formed using a tailored blank material obtained by butt joining respective ends of two or more coated steel sheets. The hot-pressed member has two or more sites formed by the respective coated steel sheets and at least one joining portion between the sites. Depending on a type of a coated layer of each of the coated steel sheets, tw/t0 is appropriately controlled where tw is a thickness of a thinnest portion in the joining portion and t0 is a thickness of a thinnest site of the sites. A tensile strength of each of the sites is 1180 MPa or more.

公开(公告)号：US10773334B2

公开(公告)日：2020-09-15

申请号：US15566344

申请日：2016-04-15

Applicant: JFE STEEL CORPORATION

Inventor： Chikaumi Sawanishi ,  Hiroshi Matsuda ,  Rinsei Ikeda

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

Abstract: A stored time variation curve and cumulative amount of heat generated of each step are each used as a target. In the case where a time variation of an instantaneous amount of heat generated per unit volume differs from the time variation curve in any of the steps, a current passage amount is controlled in order to compensate for the difference within a remaining welding time in the step so that a cumulative amount of heat generated per unit volume in actual welding matches the stored cumulative amount of heat generated in the test welding. Further, in the case where expulsion is detected in any of the steps, then in subsequent welding, the cumulative amount of heat generated per unit volume used as the target is reduced, and the current passage amount is adjusted in accordance with the reduced cumulative amount of heat generated per unit volume.

公开(公告)号：US10328518B2

公开(公告)日：2019-06-25

申请号：US14770592

申请日：2014-01-24

Applicant: JFE STEEL CORPORATION

Inventor： Yasuaki Okita ,  Chikaumi Sawanishi ,  Rinsei Ikeda ,  Kenji Oi

IPC: B23K11/24 ,  B23K11/11

Abstract: 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.

公开(公告)号：US10005151B2

公开(公告)日：2018-06-26

申请号：US15025667

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 ,  B23K20/22 ,  B23K20/24 ,  B23K20/26 ,  B23K31/02 ,  B23K101/18 ,  B23K103/04

CPC classification number: B23K20/122 ,  B23K20/1235 ,  B23K20/22 ,  B23K20/227 ,  B23K20/24 ,  B23K20/26 ,  B23K31/02 ,  B23K2101/18 ,  B23K2103/04 ,  B23K2103/05 ,  C21D1/42 ,  C21D9/50 ,  Y02P10/253

Abstract: A friction stir welding method for steel sheets includes inserting a rotating tool into an unwelded portion where two or more steel sheets are overlapped or butted together; moving the rotating tool along portions to be welded while rotating the tool so that a softened portion is formed in the steel sheets by friction heat generated between the rotating tool and the steel sheets, and the steel sheets are welded together by utilizing a plastic flow generated by the softened portion being stirred; and preheating the unwelded portion before welding by the rotating tool by a pair of heating devices disposed over and under the unwelded portion and ahead of the rotating tool in the advancing direction to enable high speed welding without the risk of generation of welding defects and damage to the welding tool.

公开(公告)号：US20140308070A1

公开(公告)日：2014-10-16

申请号：US14357016

申请日：2012-11-06

Applicant: JFE STEEL CORPORATION

Inventor： Koichi Taniguchi ,  Yasuaki Okita ,  Rinsei Ikeda

IPC: B23K11/11

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

Abstract: In a welded joint manufactured by a method of resistance spot welding thin steel sheets, when the diameter of a nugget formed from the thin steel sheets is denoted by d, on a horizontal plane passing through a nugget surrounded by a corona bond, distribution of an amount of P in a region in the nugget surrounded by a closed curve at a distance d/100 from an end portion of a weld zone toward the inside of the nugget and a closed curve at a distance d/5 from the end portion of the weld zone toward the inside of the nugget is analyzed by area analysis, and the proportion of the region in terms of area in which the concentration m (mass %) of P is more than twice the concentration M (mass %) of P of a base metal composition is 5% or less.

Abstract translation: 在通过电阻点焊薄钢板的方法制造的焊接接头中，当由薄钢板形成的熔核的直径由d表示时，在通过由电晕键包围的熔核的水平面上， 在由焊接区域的端部朝向熔核内部的距离d / 100处的封闭曲线围绕的熔核中的P的量以及距离熔核的端部距离d / 5的闭合曲线 通过面积分析来分析向熔核内侧的焊接区域，P的浓度m（质量％）的区域的面积的比例大于P的P的浓度M（质量％）的2倍 贱金属组成为5％以下。

公开(公告)号：US20140305912A1

公开(公告)日：2014-10-16

申请号：US14351926

申请日：2012-10-17

Applicant: JFE STEEL CORPORATION

Inventor： Koichi Taniguchi ,  Yasuaki Okita ,  Rinsei Ikeda

IPC: B23K11/11

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.

Abstract translation: 提供一种焊接包含高强度钢板的片组的电阻点焊方法，即使对于高Ceq材料也可以实现高接合强度。 通过在将一组焊接电极夹持并压制片材组之间焊接片材组而对两个或更多个重叠的钢板进行电阻点焊的方法包括施加焊接电流Im（kA）和成形的第一焊接步骤 具有满足以下不等式（1）的熔核直径d（mm）的熔核; 在上述第一焊接之后的冷却步骤，在继续按压片材组件的同时冷却片材组; 以及进行两步焊接的第二焊接工序，3×√tm＆nlE; d＆nlE; 6×√tm（1），其中tm是上述两个或更多个钢板中最薄的一个的厚度（mm）。

公开(公告)号：US12097571B2

公开(公告)日：2024-09-24

申请号：US18198481

申请日：2023-05-17

Applicant: JFE Steel Corporation

Inventor： Muneo Matsushita ,  Rinsei Ikeda

IPC: B23K20/00 ,  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：US11911837B2

公开(公告)日：2024-02-27

申请号：US16969976

申请日：2019-02-18

Applicant: JFE STEEL CORPORATION

Inventor： Chikaumi Sawanishi ,  Hiroshi Matsuda ,  Rinsei Ikeda

IPC: B23K11/11 ,  B23K11/25

CPC classification number: B23K11/115 ,  B23K11/257

Abstract: A resistance spot welding method comprises: performing test welding; and performing actual welding after the test welding, wherein the test welding is performed under each of two or more welding conditions. In the test welding, for each of the welding conditions, an electrode force parameter from when electrode force application to parts to be welded starts to when a set electrode force is reached before start of current passage and a time variation curve of an instantaneous amount of heat generated and a cumulative amount of heat generated are stored. In the actual welding: electrode force application to the parts to be welded is performed under each of the same conditions as in the test welding before start of current passage, and a corresponding electrode force parameter and the parameter stored in the test welding are compared for each of the welding conditions to set a target of a time variation curve of an instantaneous amount of heat generated and a cumulative amount of heat generated in the actual welding; and adaptive control welding is performed to control a current passage amount according to the target.