公开(公告)号：US20170157697A1

公开(公告)日：2017-06-08

申请号：US14962866

申请日：2015-12-08

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David S. Yang ,  David R. Sigler

IPC: B23K11/30 ,  B23K11/11 ,  B23K11/20

CPC classification number: B23K11/3009 ,  B23K11/115 ,  B23K11/20 ,  B23K35/0205 ,  B23K2103/20

Abstract: A welding electrode suitable for resistance spot welding applications includes a first portion, a second portion, and a reduced diameter portion that extends between and connects the first and second portions. The first portion includes a weld face and the second portion includes a mounting base that opens to an internal recess having a cooling pocket. The reduced diameter portion extends between a back surface of the first portion and a front surface of the second portion such that a gap separates the back and front surfaces from each other. The gap may be vacant or filled with a low conductivity material. The disclosed welding electrode may be used in conjunction with another welding electrode to resistance spot weld a workpiece stack-up that includes an aluminum workpiece and an adjacent overlapping steel workpiece.

公开(公告)号：US20170072502A1

公开(公告)日：2017-03-16

申请号：US14854467

申请日：2015-09-15

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Michael J. Karagoulis ,  David R. Sigler

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

CPC classification number: B23K11/115 ,  B23K11/16 ,  B23K2103/04

Abstract: A method of resistance spot welding steel workpieces—at least one of which includes a high-strength steel substrate having a tensile strength of 1000 MPa or greater—involves passing a pulsating DC electrical current between a pair of aligned welding electrodes that are pressed against opposite sides of a workpiece stack-up that includes the steel workpieces. The pulsating DC electrical current delivers sufficient power through the weld site by way of electrical current pulses to initiate and grow a molten steel weld pool at each faying interface within the workpiece stack-up that solidifies into a weld nugget of uniform hardness. In other words, each of the weld nuggets formed by the pulsating DC electrical current does not include soft, coarse, and alloy deficient shell regions that tend to reduce the strength of the weld nugget.

Abstract translation: 一种电阻点焊钢工件的方法 - 其中至少一个包括抗拉强度为1000MPa或更大的高强度钢基材 - 包括使一对对齐的焊接电极之间的脉动直流电流通过相对的 包括钢工件的工件叠层的侧面。 脉动直流电流通过电流脉冲通过焊接部位提供足够的电力，以在工件堆叠内的每个接合界面处起始和生长熔融钢熔池，从而固化成具有均匀硬度的焊接熔核。 换句话说，由脉动DC电流形成的每个焊接块不包括倾向于降低焊点熔核强度的软的，粗的和合金缺陷的壳区。

公开(公告)号：US20170008118A1

公开(公告)日：2017-01-12

申请号：US14792656

申请日：2015-07-07

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David Yang ,  Blair E. Carlson ,  David R. Sigler

IPC: B23K11/11 ,  B23K11/20

CPC classification number: B23K11/115 ,  B23K11/20 ,  B23K37/003 ,  B23K2103/20

Abstract: A workpiece stack-up that includes at least a steel workpiece and an aluminum-based workpiece can be resistance spot welded by a spot welding method in which the welding current is controlled to perform one or more stages of weld joint development. When it is desired to terminate weld current flow and to solidify a liquid weld pool into a weld nugget (of mostly aluminum-based composition), additional cooling is applied to the outer surface of the aluminum-based workpiece around the contact area of the spot welding electrode engaging the surface of the aluminum-based workpiece surface. The additional cooling is applied and controlled so as to increase the rate of solidification of the liquid aluminum-based material and to control the direction of solidification of the weld nugget to better confine impurities, and the like, originally in the melt, at the surface of the steel workpiece.

Abstract translation: 包括至少钢工件和铝基工件的工件堆叠可以通过点焊方法进行电阻点焊，其中焊接电流被控制以进行一个或多个焊接接头显影阶段。 当需要终止焊接电流流动并将液体熔池固化成焊接熔核（大部分为铝基组合物）时，在铝基工件的外表面周围的点的接触区域附加额外的冷却 焊接电极接合铝基工件表面的表面。 施加和控制额外的冷却，以提高液态铝基材料的固化速度，并且控制焊接熔核的凝固方向以更好地限制最初在熔体中的杂质等在表面上 的钢工件。

公开(公告)号：US20160354857A1

公开(公告)日：2016-12-08

申请号：US15237770

申请日：2016-08-16

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David R. Sigler ,  Michael J. Karagoulis

IPC: B23K11/30 ,  B23K35/30 ,  B23K11/11

CPC classification number: B23K11/3063 ,  B23B5/166 ,  B23K11/11 ,  B23K11/115 ,  B23K35/222 ,  B23K35/302 ,  B23K2103/10

Abstract: A method of resistance spot welding aluminum alloy workpieces together is disclosed that involves periodically texturing and dressing of at least one of the two electrode weld faces. The texturing and dressing steps help preserve the ability of the welding electrode to deliver electrical current through the overlapping aluminum alloy workpieces being welding despite the presence of one or more oxide layers on the surfaces of the workpieces and, as such, are effective in prolonging the useful life of the electrode(s).

Abstract translation: 公开了一种将铝合金工件的电阻点焊在一起的方法，其包括周期性地对两个电极焊接面中的至少一个进行构图和修整。 纹理和修整步骤有助于保持焊接电极通过正在焊接的重叠铝合金工件传送电流的能力，尽管在工件的表面上存在一个或多个氧化物层，并且因此有效地延长了 电极的使用寿命。

公开(公告)号：US20160158874A1

公开(公告)日：2016-06-09

申请号：US14561746

申请日：2014-12-05

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Pei-Chung Wang ,  David R. Sigler ,  Blair E. Carlson

IPC: B23K11/20 ,  B23K11/30 ,  B23K11/11

CPC classification number: B23K11/20 ,  B23K11/115 ,  B23K11/3009 ,  B23K2103/20

Abstract: A method of resistance spot welding a steel workpiece and an aluminum or aluminum alloy workpiece together includes several steps. In one step a workpiece stack-up is provided. The workpiece stack-up includes a steel workpiece and an aluminum or aluminum alloy workpiece. Another step involves providing a first welding electrode that confronts the aluminum workpiece, and providing a second welding electrode that confronts the steel workpiece. The first welding electrode has an electrode body and an insert that functions to limit or eliminate heat flux into the electrode body. Other steps of the method involve bringing the first and second welding electrodes into contact with opposite sides of the workpiece stack-up and resistance spot welding the stack-up.

Abstract translation: 钢工件和铝或铝合金工件的电阻点焊方法包括几个步骤。 在一个步骤中，提供了工件叠层。 工件堆叠包括钢工件和铝或铝合金工件。 另一步骤是提供面对铝工件的第一焊接电极，并提供面对钢工件的第二焊接电极。 第一焊接电极具有用于限制或消除热通量进入电极体的电极体和插入物。 该方法的其他步骤包括使第一焊接电极和第二焊接电极与工件叠置的相对侧接触，并且电阻点焊叠层。

公开(公告)号：US20150158113A1

公开(公告)日：2015-06-11

申请号：US14592134

申请日：2015-01-08

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David R. Sigler ,  James G. Schroth ,  Xiaohong Q. Gayden ,  Yen-Lung Chen

IPC: B23K20/16 ,  B23K20/10 ,  B23K11/20 ,  B23K20/02 ,  B23K11/11 ,  B23K11/16 ,  B23K20/233 ,  B23K20/227

CPC classification number: B23K20/16 ,  B23K11/11 ,  B23K11/163 ,  B23K11/20 ,  B23K20/023 ,  B23K20/10 ,  B23K20/2275 ,  B23K20/233 ,  B23K20/2333 ,  B23K20/2336 ,  B23K2101/18 ,  B23K2101/34 ,  B23K2103/04 ,  B23K2103/08 ,  B23K2103/10 ,  B23K2103/15 ,  B23K2103/18 ,  B23K2103/20

Abstract: Aluminum alloy workpieces and/or magnesium alloy workpieces are joined in a solid state weld by use of a reactive material placed, in a suitable form, at the joining surfaces. Joining surfaces of the workpieces are pressed against the interposed reactive material and heated. The reactive material alloys or reacts with the workpiece surfaces consuming some of the surface material in forming a reaction product comprising a low melting liquid that removes oxide films and other surface impediments to a welded bond across the interface. Further pressure is applied to expel the reaction product and to join the workpiece surfaces in a solid state weld bond.

Abstract translation: 铝合金工件和/或镁合金工件通过使用以合适的形式放置在接合表面的反应性材料在固态焊接中接合。 将工件的接合表面压在插入的反应性材料上并加热。 反应性材料合成或与工件表面反应，在形成反应产物时消耗一些表面材料，所述反应产物包含低熔点液体，该低熔点液体除去界面上的氧化膜和其它表面阻碍物以焊接粘结。 施加进一步的压力以排出反应产物并且以固态焊接接合工件表面。

公开(公告)号：US20150053654A1

公开(公告)日：2015-02-26

申请号：US14462655

申请日：2014-08-19

Applicant: GM Global Technology Operations LLC

Inventor： David R. Sigler ,  Blair E. Carlson ,  Michael J. Karagoulis

IPC: B23K11/20 ,  B23K11/30 ,  B23K11/11

CPC classification number: B23K11/20 ,  B23K11/115 ,  B23K11/30 ,  B23K11/3063 ,  B23K35/0205 ,  B23K2103/20

Abstract: A method of resistance spot welding a steel workpiece and an aluminum or aluminum alloy (“aluminum”) workpiece together includes several steps. One step involves providing a workpiece stack-up with a steel workpiece and an aluminum workpiece. Another step involves attaching a cover over a weld face of a welding electrode. The cover is made of a metal material with an electrical resistivity that is greater than an electrical resistivity of a material of the welding electrode. Yet another step involves performing multiple individual resistance spot welds to the workpiece stack-up. The cover abuts the aluminum workpiece while the individual resistance spot welds are performed. And another step involves removing the cover from the welding electrode after the individual spot welds are performed.

Abstract translation: 钢工件和铝或铝合金（“铝”）工件的电阻点焊方法包括几个步骤。 一步包括提供与钢工件和铝工件的工件堆叠。 另一步涉及将盖覆盖在焊接电极的焊接面上。 该盖由电阻率大于焊接电极材料的电阻率的金属材料制成。 另一个步骤涉及对工件堆叠执行多个单独的电阻点焊。 当执行单独的电阻点焊时，盖与铝工件邻接。 另外一步是在进行各个点焊之后从焊接电极上拆下盖子。

公开(公告)号：US20140319105A1

公开(公告)日：2014-10-30

申请号：US14305461

申请日：2014-06-16

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Sampath K. Vanimisetti ,  David R. Sigler

IPC: B23K11/11

CPC classification number: B23K11/115 ,  B23K11/3018 ,  B23K35/0205 ,  B23K35/0261

Abstract: A welding electrode includes an electrode holder and an electrode cap removably attached to the holder and having a central longitudinal axis. The cap includes a body having an end, and a welding surface that is substantially smooth and free from any grooves defined therein, and has a first diameter of from about 7 to 10 mm, a first radius of curvature, and a second radius of curvature that is different from the first radius. The cap includes a skirt portion extending away from the body and configured to bear against the holder. The skirt portion has a first face that is substantially parallel to the axis and spaced apart from the surface. The body has a second face interconnecting the first face and the surface, and the body tapers from the first face to the surface. A method of forming a resistance spot weld joint is also disclosed.

Abstract translation: 焊接电极包括电极保持器和可拆卸地附接到保持器并具有中心纵向轴线的电极帽。 盖包括具有端部的主体和基本上平滑且没有限定在其中的任何凹槽的焊接表面，并且具有约7至10mm的第一直径，第一曲率半径和第二曲率半径 这与第一个半径不同。 盖子包括一个远离主体延伸的裙部，并被配置为承受支架。 裙部具有基本上平行于轴线并与表面间隔开的第一面。 主体具有互连第一面和表面的第二面，并且本体从第一面到表面逐渐变细。 还公开了形成电阻点焊接头的方法。