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    Welding electrode for use in a resistance spot welding workpiece stack-ups that include an aluminum workpiece and a steel workpiece
    1.
    发明授权
    Welding electrode for use in a resistance spot welding workpiece stack-ups that include an aluminum workpiece and a steel workpiece 有权

    公开(公告)号：US10751830B2

    公开(公告)日：2020-08-25

    申请号：US15482742

    申请日：2017-04-08

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David R. Sigler ,  David S. Yang

    IPC: B23K11/20 ,  B23K11/30 ,  B23K103/20

    Abstract: A welding electrode is disclosed that includes an electrode welding shell and a blind adapter that are joined together to cooperatively define an internal cavity. The electrode welding shell and the blind adapter may be integrally formed or they may be distinct components that are attached together. The presence of the internal cavity defined by the electrode welding shell and the blind adapter reduces the thermal mass of the welding electrode and slows the rate of conductive heat transfer from the weld face to a cooling fluid, which allows in the center of the weld face to retain heat for a longer duration once current flow through the welding electrode is terminated, thereby positively affecting the spot welding process for particular types of workpiece stack-ups including those that include an aluminum workpiece and an overlapping adjacent steel workpiece.

    Joining of thermoplastic to metal with enhanced interfacial chemical bonding
    2.
    发明授权
    Joining of thermoplastic to metal with enhanced interfacial chemical bonding 有权

    公开(公告)号：US10569477B2

    公开(公告)日：2020-02-25

    申请号：US15546547

    申请日：2015-01-26

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Jing Zhang ,  David S. Yang ,  Shawn Deng

    IPC: B29C65/00 ,  B29C65/16 ,  B29C65/44 ,  B32B15/088 ,  B32B15/18

    Abstract: A method of attaching a thermoplastic-based workpiece and a metal workpiece involves the use of a metal reaction coating. The metal reaction coating is applied over a base metal substrate of the metal workpiece such that the metal reaction coating faces and contacts the thermoplastic-based workpiece when the two workpieces are assembled in overlapping fashion. To attach the workpieces at their faying interface, an energy source such as, for example, a laser beam or an electric arc, is directed against the metal workpiece to create a zone of concentrated heat that at least warms up the metal reaction coating and melts a portion of the thermoplastic-based workpiece. Such heated activity at the faying interface promotes interfacial chemical bonding between the thermoplastic-based workpiece and the metal workpiece that contributes to an enhanced attachment between the workpieces.

    Laser welding overlapping metal workpieces
    3.
    发明授权
    Laser welding overlapping metal workpieces 有权

    公开(公告)号：US10688595B2

    公开(公告)日：2020-06-23

    申请号：US15575170

    申请日：2015-06-02

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David S. Yang ,  Justin Allen Wolsker ,  Jing Zhang ,  Wu Tao ,  Dalong Gao

    IPC: B23K26/244 ,  B23K101/34 ,  B23K103/04 ,  B23K103/08

    Abstract: A method of laser welding a workpiece stack-up (10) that includes at least two overlapping steel workpieces (12, 14) comprises directing a laser beam (40) at a top surface (26) of the workpiece stack-up to form a keyhole (56) surrounded by a molten steel weld pool (58). The laser beam is conveyed along a predefined weld pattern that includes one or more nonlinear inner weld paths (66) and an enclosed outer peripheral weld path (68) surrounding the one or more nonlinear inner weld paths. During conveyance of the laser beam along the one or more nonlinear inner weld paths, the keyhole fully penetrates through the workpiece stack-up from the top surface of the stack-up to the bottom surface (28) of the stack-up. The method produces weld joints between the steel workpieces that do not have an intentionally imposed gap formed between their faying surfaces.

    Resistance spot welding steel and aluminum workpieces with electrode having insert
    4.
    发明授权
    Resistance spot welding steel and aluminum workpieces with electrode having insert 有权

    公开(公告)号：US10682723B2

    公开(公告)日：2020-06-16

    申请号：US15097821

    申请日：2016-04-13

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David R. Sigler ,  Blair E. Carlson ,  James G. Schroth ,  David S. Yang ,  Anil K. Sachdev

    IPC: B23K11/20 ,  B23K11/11 ,  B23K11/30 ,  B23K103/20

    Abstract: A method of resistance spot welding a steel workpiece and an aluminum or aluminum alloy workpiece, and a welding electrode used therein. In one step of the method a workpiece stack-up is provided. The workpiece stack-up includes a steel workpiece and an aluminum or aluminum alloy workpiece. Another step of the method involves contacting the aluminum or aluminum alloy workpiece with a weld face of the welding electrode. The welding electrode has a body and an insert. The insert is composed of a material having an electrical resistivity that is greater than an electrical resistivity of the material of the body. The weld face has a first section defined by a surface of the insert and has a second section defined by a surface of the body. Both the first and second sections make surface-to-surface contact with the aluminum or aluminum alloy workpiece amid resistance spot welding.

    WELDING ELECTRODE FOR USE IN A RESISTANCE SPOT WELDING WORKPIECE STACK-UPS THAT INCLUDE AN ALUMINUM WORKPIECE AND A STEEL WORKPIECE
    6.
    发明申请
    WELDING ELECTRODE FOR USE IN A RESISTANCE SPOT WELDING WORKPIECE STACK-UPS THAT INCLUDE AN ALUMINUM WORKPIECE AND A STEEL WORKPIECE 审中-公开

    公开(公告)号：US20170291248A1

    公开(公告)日：2017-10-12

    申请号：US15482742

    申请日：2017-04-08

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David R. Sigler ,  David S. Yang

    IPC: B23K11/20 ,  B23K11/30

    CPC classification number: B23K11/20 ,  B23K11/3018 ,  B23K2103/20

    Abstract: A welding electrode is disclosed that includes an electrode welding shell and a blind adapter that are joined together to cooperatively define an internal cavity. The electrode welding shell and the blind adapter may be integrally formed or they may be distinct components that are attached together. The presence of the internal cavity defined by the electrode welding shell and the blind adapter reduces the thermal mass of the welding electrode and slows the rate of conductive heat transfer from the weld face to a cooling fluid, which allows in the center of the weld face to retain heat for a longer duration once current flow through the welding electrode is terminated, thereby positively affecting the spot welding process for particular types of workpiece stack-ups including those that include an aluminum workpiece and an overlapping adjacent steel workpiece.

    METHOD FOR LASER WELDING ALUMINUM WORKPIECES
    7.
    发明申请
    METHOD FOR LASER WELDING ALUMINUM WORKPIECES 审中-公开

    公开(公告)号：US20180214983A1

    公开(公告)日：2018-08-02

    申请号：US15747287

    申请日：2015-08-31

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David S. Yang ,  Wu Tao

    IPC: B23K26/244 ,  B23K26/082 ,  B23K26/322

    CPC classification number: B23K26/244 ,  B23K26/082 ,  B23K26/322 ,  B23K2101/006 ,  B23K2101/18 ,  B23K2101/34 ,  B23K2103/10

    Abstract: A method of laser welding a workpiece stack-up (10) that includes at least two overlapping aluminum workpieces (12, 14), at least one of which includes a protective anti-corrosion coating (38), is disclosed. The disclosed method includes advancing the laser beam (56) relative to the top surface (26) of the workpiece stack-up (10) along a travel path (78, 78′, 78″, 78′″) that imposes bidirectional movement of the laser beam (56). In particular, the laser beam (56) moves in a forward direction (80) while also moving back and forth in a lateral direction (82) oriented transverse to the forward direction (80) as it is being advanced relative to the top surface (26). Such bidirectional movement is believed to help disturb the protective anti-corrosion coating (38) in and around the molten aluminum weld pool (74), thus leading to a laser weld joint (68) that contains less weld defects derivable from the protective anti-corrosion coating(s) (38).

    RESISTANCE SPOT WELDING STEEL AND ALUMINUM WORKPIECES WITH ELECTRODE HAVING INSERT
    8.
    发明申请
    RESISTANCE SPOT WELDING STEEL AND ALUMINUM WORKPIECES WITH ELECTRODE HAVING INSERT 审中-公开

    公开(公告)号：US20170297135A1

    公开(公告)日：2017-10-19

    申请号：US15097821

    申请日：2016-04-13

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David R. Sigler ,  Blair E. Carlson ,  James G. Schroth ,  David S. Yang ,  Anil K. Sachdev

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

    Abstract: A method of resistance spot welding a steel workpiece and an aluminum or aluminum alloy workpiece, and a welding electrode used therein. In one step of the method a workpiece stack-up is provided. The workpiece stack-up includes a steel workpiece and an aluminum or aluminum alloy workpiece. Another step of the method involves contacting the aluminum or aluminum alloy workpiece with a weld face of the welding electrode. The welding electrode has a body and an insert. The insert is composed of a material having an electrical resistivity that is greater than an electrical resistivity of the material of the body. The weld face has a first section defined by a surface of the insert and has a second section defined by a surface of the body. Both the first and second sections make surface-to-surface contact with the aluminum or aluminum alloy workpiece amid resistance spot welding.

    External heat assisted welding of dissimilar metal workpieces
    10.
    发明授权
    External heat assisted welding of dissimilar metal workpieces 有权

    公开(公告)号：US10421148B2

    公开(公告)日：2019-09-24

    申请号：US15137778

    申请日：2016-04-25

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David R. Sigler ,  David S. Yang ,  Anil K. Sachdev

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

    Abstract: A method of resistance spot welding a workpiece stack-up that includes an aluminum workpiece and an adjacent overlapping steel workpiece is disclosed. The method uses a first welding electrode positioned proximate the aluminum workpiece and a second welding electrode positioned proximate the steel workpiece to effectuate the spot welding process. In an effort to positively affect the strength of the ultimately-formed weld joint, external heat may be supplied to the first welding electrode by an external heating source disposed in heat transfer relation with the first welding electrode either before or after, or both before or after, an electrical current is passed between the first and second welding electrodes to create a molten aluminum weld pool within the aluminum workpiece.

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