公开(公告)号：JP2013078782A

公开(公告)日：2013-05-02

申请号：JP2011219876

申请日：2011-10-04

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

Inventor： OKITA YASUAKI ,  TANIGUCHI KOICHI ,  IKEDA TOMOMASA

IPC: B23K11/16 ,  B23K11/11 ,  B23K11/24

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welded joint for high-strength thin steel sheets excelling in joint tensile property, and a welding technology for obtaining the joint.SOLUTION: The resistance spot welded joint for high-strength thin steel sheets is formed by a resistance spot welding method of welding two or more overlapped high-strength thin steel sheets by holding them between a pair of electrodes and applying a current while applying pressure. In the joint, a softened region lower in hardness than a base material exists on the outside of a nugget, and a structure in the nugget has an equiaxed shape and is a martensitic structure. The welding method for manufacturing the joint is also provided.

Abstract translation: 要解决的问题：提供一种优异的接合拉伸性能的高强度薄钢板的电阻点焊接头和用于获得接头的焊接技术。 解决方案：用于高强度薄钢板的电阻点焊接头通过电阻点焊方法形成，该方法通过将两个或更多个重叠的高强度薄钢板保持在一对电极之间并施加电流同时 施加压力。 在接头中，硬度低于基材的软化区域存在于熔核的外侧，并且熔核中的结构具有等轴形状并且是马氏体结构。 还提供了用于制造接头的焊接方法。 版权所有（C）2013，JPO＆INPIT

公开(公告)号：JP2013151027A

公开(公告)日：2013-08-08

申请号：JP2013060023

申请日：2013-03-22

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

Inventor： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA TOMOMASA

IPC: B23K11/11 ,  B23K11/16

Abstract: PROBLEM TO BE SOLVED: To provide a high-strength resistance spot welded joint by suppressing separation and rupture without causing softening by degrading segregation of a nugget on two or more plate assemblies and preventing generation of cracks.SOLUTION: When the diameter of a nugget structured by thin steel plates is d in a resistance spot welded joint of the thin steel plates, a distribution state of the quantity of P, which exists in a region within the nugget surrounded by a closed curve of a distance d/100 and a closed curve of a distance d/5 in a nugget internal direction from an end part of a melting part on a level surface of the nugget surrounded by a corona bond, is subjected to surface analysis. The resistance spot welded joint is characterized by that an area ratio in which the concentration m (mass%) of P exceeds twice the concentration M (mass%) of a base material composition is 5% or less.

Abstract translation: 要解决的问题：为了通过降低两个或更多个板组件上的熔核的分离而不产生软化而抑制分离和破裂来提供高强度电阻点焊接头，并防止产生裂纹。解决方案：当熔核结构的直径 在薄钢板的电阻点焊接中，薄钢板是d，存在于通过距离d / 100的闭合曲线包围的熔核内的区域中的P的分布状态，闭合曲线 在由电晕接合环包围的熔核的水平面上的熔融部分的端部在熔核内部方向上距离d / 5的距离d / 5进行表面分析。 电阻点焊接头的特征在于，P的浓度m（质量％）超过基材组合物的浓度M（质量％）的两倍的面积比为5％以下。

公开(公告)号：JP2013103273A

公开(公告)日：2013-05-30

申请号：JP2011251294

申请日：2011-11-17

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

Inventor： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA TOMOMASA

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

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welded joint of a high-strength thin steel sheet excellent in joint tensile characteristics, and a welding technique to obtain the joint.SOLUTION: A resistance spot welding method for welding a sheet bundle of two or more steel sheets which are piled up by sandwiching with a pair of welding electrodes, pressurizing, and energizing includes a main process for forming a nugget of a prescribed diameter by energization, a middle process for pressurizing the nugget while non-energizing, and a post-process for re-energizing the nugget. In the post-process, the maximum temperature TT of the interface between the nugget and a corona bond on a non-melting part side satisfies TT>Ac.

Abstract translation: 要解决的问题：提供接合拉伸特性优异的高强度薄钢板的电阻点焊接头和获得接头的焊接技术。 解决方案：用于焊接通过夹着一对焊接电极堆叠的两个或更多个钢板的片材束的加压和激励的电阻点焊方法包括用于形成规定直径的熔核的主要工艺 通过激励，在不通电的同时对熔核进行加压的中间过程，以及用于重新给予熔核的后期处理。 在后期处理中，熔核与非熔融部分侧之间的电晕接合面的界面的最高温度TT满足TT> Ac 3 。 版权所有（C）2013，JPO＆INPIT

公开(公告)号：JP2013086125A

公开(公告)日：2013-05-13

申请号：JP2011228406

申请日：2011-10-18

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

Inventor： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA TOMOMASA

IPC: B23K11/11 ,  B23K11/16 ,  B23K11/24

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

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method for a sheet set including a high strength steel sheet, in which a problem is solved to attain high joint strength even with a higher Ceq material.SOLUTION: In a resistance spot welding method, a sheet set in which two or more steel sheets are stacked is pinched with a pair of welding electrodes, and welding is made by electrification while pressure is being applied. The method includes a first electrification step for forming a nugget diameter d (mm) which satisfies formula (1) by applying a current value Im (kA), an electrification interruption step (A) which is performed after the first electrification for cooling while the pressure being applied, and a second electrification step for performing electrification using two stages of current values, with respective steps performed in this order. Formula (1) is 3×√t≤d≤6×√, where tis sheet thickness (mm) of a sheet whose thickness is smallest among the two or more steel sheets.

Abstract translation: 要解决的问题：为了提供一种包括高强度钢板的片材组的电阻点焊方法，其中即使使用较高Ceq材料也可解决问题以获得高接合强度。 解决方案：在电阻点焊方法中，其中堆叠有两个或更多个钢板的板组被一对焊接电极夹紧，并且在施加压力的同时通过带电进行焊接。 该方法包括：第一带电步骤，用于通过施加电流值Im（kA），在第一次带电冷却之后执行的通电中断步骤（A），形成满足式（1）的熔核直径d（mm） 施加压力的第二充电步骤，以及使用两级电流值进行通电的第二充电步骤，按顺序执行。 公式（1）为3×√t m ≤d≤6×√ tm ，其中t m

公开(公告)号：JP2010172946A

公开(公告)日：2010-08-12

申请号：JP2009019065

申请日：2009-01-30

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

Inventor： OKITA YASUAKI ,  TANIGUCHI KOICHI ,  IKEDA TOMOMASA

IPC: B23K11/11 ,  B23K11/16 ,  B23K11/24 ,  B23K103/04

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method of a high-strength steel sheet, which is excellent in tensile property of a joint. SOLUTION: In the resistance spot welding method, an electric current is made to flow to perform welding while a set of sheets having two or more high-strength steel sheets superimposed is held between a pair of electrodes, and a pressure force is added. The resistance spot welding is performed in a process including a first step of forming a nugget by main energization, a second step of cooling a weld zone by holding the set clamped with the electrodes after the completion of the first step and, after the completion of the second step, a third step of making an electric current flow that is higher than the main energization in an extremely short time within a range producing no expulsion. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供一种接头的拉伸性优异的高强度钢板的电阻点焊方法。 解决方案：在电阻点焊方法中，使具有两个或更多个高强度钢板的一组片材叠加在一对电极之间，使电流流动以进行焊接，并且压力为 添加。 电阻点焊在包括通过主通电形成熔核的第一步骤的过程中进行，第二步骤是在第一步骤完成之后保持用电极夹持的电极来冷却焊接区域，并且在完成之后 第二步骤，在不产生排出的范围内，在极短时间内使电流高于主通电的第三步骤。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2013126692A

公开(公告)日：2013-06-27

申请号：JP2013057599

申请日：2013-03-21

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

Inventor： TANIGUCHI KOICHI ,  OKITA YASUAKI ,  IKEDA TOMOMASA

IPC: B23K11/11 ,  B23K11/16 ,  B23K11/24

Abstract: PROBLEM TO BE SOLVED: To provide a high-strength resistance spot welding joint that is prevented from peeling and fracturing and is not softened by reducing the segregation of nugget and making the occurrence of crack difficult to a group of two plates or more.SOLUTION: The resistance spot welding joint for a thin steel plate is characterized in that, provided that the diameter of a nugget configured by the thin steel plate is d, a surface analysis is conducted to analyze the distribution state of an amount of P present on a region within the nugget enclosed by a closed curve having a distance of d/100 and a closed curve having a distance of d/5 in an inward direction of the nugget from an end of a fused portion on the horizontal surface of the nugget surrounded by corona bond, and an area ratio in which the density m (mass%) of P is more than twice as much as the density M (mass%) of P of a mother material composition is at 5% or less.

Abstract translation: 要解决的问题：提供一种防止剥离和断裂的高强度电阻点焊接头，并且通过减少熔核的偏析并且使得难以发生两组或更多组的裂纹的发生而不软化 。 解决方案：用于薄钢板的电阻点焊接头的特征在于，如果由薄钢板构成的熔核的直径为d，则进行表面分析以分析一部分的分布状态 P存在于熔核内的区域内，该闭合曲线具有距离d / 100的封闭曲线，并且在熔核的向内方向上距离熔核部分的水平表面上的熔融部分的端部具有距离为d / 5的闭合曲线 由电晕接合包围的熔核，并且P的密度m（质量％）的面积比例是母材组合物的P的密度M（质量％）的2倍以上的面积比为5％以下。 版权所有（C）2013，JPO＆INPIT

公开(公告)号：JP2013111584A

公开(公告)日：2013-06-10

申请号：JP2011256906

申请日：2011-11-25

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

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

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding joint in which nugget segregation is reduced with respect to sheet groupings of two or more, separation fractures are suppressed by making occurrences of cracking difficult, and which has high strength without softening.SOLUTION: When d is the diameter of a nugget formed of thin steel sheets in a resistance spot welding joint for thin steel sheets, the resistance spot welding joint is characterized by the proportion of the surface area, where the P concentration m (mass%) exceeds twice the P concentration M (mass%) of the base material composition, being 5% or less with a surface analysis of the distribution state of the amount of P present in the region within the nugget surrounded by a closed curve at a distance of d/100 and a closed curve at a distance of d/5 performed on a horizontal plane of the nugget surrounded by a corona bond in a direction toward the inside of the nugget from the end part of the melt part.

Abstract translation: 要解决的问题：为了提供相对于两个或更多个片材组合来降低熔核偏析的电阻点焊接头，通过难以发生裂纹并且具有高的强度而没有软化来抑制分离断裂。 解决方案：当d是薄钢板电阻点焊接头中由薄钢板形成的熔核的直径时，电阻点焊接头的特征在于表面积的比例，其中P浓度m 质量％）超过基本材料组合物的P浓度M（质量％）的两倍，通过在由闭合曲线包围的熔核内的区域内的存在量P的分布状态的表面分析为5％以下 在熔融部分的端部朝向熔核内侧的方向上由电晕接合包围的熔核的水平面上执行d / 100的距离和距离为d / 5的闭合曲线。 版权所有（C）2013，JPO＆INPIT

公开(公告)号：JP2009241112A

公开(公告)日：2009-10-22

申请号：JP2008091494

申请日：2008-03-31

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

Inventor： OKITA YASUAKI ,  IKEDA MICHIO ,  ONO MORIAKI

IPC: B23K11/11 ,  B23K11/24 ,  B23K11/30

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method that is advantageous in obtaining a sound weld zone between a thin plate and a thick plate, even with presence of any gap between the plates, in a plate assembly having a large thickness ratio in which a thin plate is superposed on at least any one of two or more superposed thick plates.
SOLUTION: In performing the resistance spot welding while holding a plate assembly (workpiece) 10 by a pair of electrodes 16, 17 and applying the pressure thereto, the workpiece 10 having a large thickness ratio such that a thin steel plate 11 is superposed on superposed two thick plates 12, 13 and that gaps 31, 32 are also present between the steel plates, there are provided a preliminary process and a regular process. In the preliminary process, the workpiece is pressurized with a high pressure to collapse the gaps 31, 32 and then the pressure is reduced. In the regular process, welding is performed under low pressure, short time and high current in the early stage of the welding, and then welding is performed under high pressure in the latter stage.
COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：为了提供一种有利于获得薄板和厚板之间的良好焊接区域的电阻点焊方法，即使在板之间存在任何间隙，在具有大的板组件 薄板叠加在两个或多个叠加的厚板中的至少任一个上的厚度比。 解决方案：在通过一对电极16,17保持板组件（工件）10并施加压力的同时执行电阻点焊，具有较大厚度比的工件10，使得薄钢板11为 叠加在两个厚板12,13上，并且间隙31,32也存在于钢板之间，提供了初步工艺和常规工艺。 在初步处理中，工件被高压加压以使间隙31,32折叠，然后降低压力。 在正常工艺中，在焊接初期，在低压，短时，高电流下进行焊接，然后在后期进行高压焊接。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2013052413A

公开(公告)日：2013-03-21

申请号：JP2011192217

申请日：2011-09-05

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

Inventor： OKITA YASUAKI ,  IKEDA TOMOMASA

IPC: B23K11/11 ,  B23K11/16

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method which enables a sound weld zone to be obtained between a thin plate and a thick plate even with presence of any gap between the plates, in a plate assembly having a large thickness ratio in which a thin plate is further superposed on at least any one of outside of two or more superposed thick plates.SOLUTION: In performing the resistance spot welding while holding a plate assembly 10, provided by superposing a thin plate 11 on superposed two thick plates 12, 13, by a pair of electrodes 16, 17 and applying a pressure thereto, a resin 26 having no conductive property is interposed in (a gap 22), between the superposed two thick plates 12, 13 and a welding process is divided into a preceding period and a latter period. In the preceding period of welding, welding is performed in a short time with a low pressure not pushing out the resin 26 interposed between the superposed two thick plates 12 and 13 from right under the electrode, and then, after stopping the power distribution and increasing the pressure, the latter period of welding is started, and welding is performed under a high pressure.

Abstract translation: 要解决的问题：为了提供即使在板之间存在任何间隙也能够在薄板和厚板之间获得良好的焊接区域的电阻点焊方法，在具有大厚​​度的板组件中 比例，其中薄板进一步重叠在两个或更多个叠加的厚板的外部中的至少任一个上。 解决方案：在保持板组件10的同时执行电阻点焊，其通过将薄板11叠置在叠置的两个厚板12,13上，由一对电极16,17施加压力而提供，树脂 （间隙22）中插入不具有导电性的电极26,26之间，焊接过程分为前一周期和后期。 在上一期焊接中，在低压下进行短时间的焊接，不从电极的右下方推出插入重叠的两个厚板12和13之间的树脂26，然后停止配电并增加 压力，后期的焊接开始，并且在高压下进行焊接。 版权所有（C）2013，JPO＆INPIT

公开(公告)号：JP2013035063A

公开(公告)日：2013-02-21

申请号：JP2012157070

申请日：2012-07-13

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

Inventor： OKITA YASUAKI ,  IKEDA TOMOMASA

IPC: B23K11/11 ,  B23K11/20 ,  B23K11/24 ,  B23K103/04

Abstract: PROBLEM TO BE SOLVED: To provide a resistance spot welding method that can obtain a sound joint part between a thin plate and a thick plate even with a plate gap between the plates in a plate assembly with a large plate thickness ratio formed by further stacking a thin plate on at least one outside of two or more stacked thick plates.SOLUTION: The plate assembly 10 with the thin plate 11 stacked on the upper face of two stacked thick plates 12, 13 is held by a pair of electrodes 16, 17, and resistance spot welding is performed while applying pressing force. At this time, conductive resin 26 is interposed between the thick plates 12, 13 (in the plate gap 22), and a welding process is divided into a former period and a latter period. In the former period, welding is performed with such low pressing force that pressing force P satisfies P≤3kN, and in the latter period, welding is performed with energization under high pressure.

Abstract translation: 要解决的问题：提供一种电阻点焊方法，其即使在板组件中的板之间的板间隙也可以获得薄板和厚板之间的声音接合部分，板组件具有由 在两个或多个堆叠的厚板的至少一个外部进一步堆叠薄板。 解决方案：具有堆叠在两个堆叠的厚板12,13的上表面上的薄板11的板组件10由一对电极16,17保持，并且施加压力时进行电阻点焊。 此时，导电树脂26插入在厚板12,13之间（板间隙22中），并且焊接过程被分为前一周期和后一周期。 在前一时期，以这样的低压力进行焊接，使得按压力P满足P≤3kN，在后一时期，在高压下通电进行焊接。 版权所有（C）2013，JPO＆INPIT