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    LASER BRAZING OF METAL WORKPIECES WITH RELATIVE MOVEMENT BETWEEN LASER BEAM AND FILLER WIRE
    31.
    发明申请
    LASER BRAZING OF METAL WORKPIECES WITH RELATIVE MOVEMENT BETWEEN LASER BEAM AND FILLER WIRE 审中-公开

    公开(公告)号：US20190061053A1

    公开(公告)日：2019-02-28

    申请号：US15685290

    申请日：2017-08-24

    Applicant: GM Global Technology Operations LLC

    Inventor： David Yang ,  Justin Wolsker ,  Blair Carlson ,  Wu Tao

    IPC: B23K26/08 ,  B23K26/244 ,  B23K26/10

    Abstract: A method of laser brazing a metal workpiece assembly along a joint seam established between a first metal workpiece and a second metal workpiece involves advancing a laser beam along the joint seam while feeding a filler wire into the laser beam to melt a leading end of the filler wire, which is impinged by the laser beam, to produce and dispense molten filler material within and along the joint seam. The dispensed molten filler material solidifies behind the laser beam into a braze joint. Additionally, as part of the method, a position of a focal point of the laser beam relative to the leading end of the filler wire is repeatedly fluctuated during advancement of the laser beam along at least part of the joint seam.

    METHOD AND APPARATUS FOR RESISTANCE SPOT WELDING OVERLAPPING STEEL WORKPIECES
    32.
    发明申请
    METHOD AND APPARATUS FOR RESISTANCE SPOT WELDING OVERLAPPING STEEL WORKPIECES 审中-公开

    公开(公告)号：US20190001428A1

    公开(公告)日：2019-01-03

    申请号：US15638699

    申请日：2017-06-30

    Applicant: GM Global Technology Operations LLC

    Inventor： David Yang ,  Wu Tao ,  Qi Lu ,  Blair E Carlson

    IPC: B23K11/11 ,  B23K11/16 ,  B23K11/36 ,  B32B15/01

    Abstract: A method of resistance spot welding a workpiece stack-up comprising overlapping first and second steel workpieces is disclosed, wherein at least one of the steel workpieces comprises an advanced high-strength steel substrate. The workpiece stack-up is positioned between a pair of opposed first and second welding electrodes. A cover is disposed between at least one of the first steel workpiece and the first welding electrode or the second steel workpiece and the second welding electrode at an intended weld site. The workpiece stack-up is clamped between the first and second welding electrodes at the weld site such that at least one of the weld faces of the first and second welding electrodes presses against the cover. The first and second steel workpieces are welded together by passing an electrical current between the first and second welding electrodes at the weld site.

    REMOTE LASER WELDING OF OVERLAPPING METAL WORKPIECES USING HELICAL PATH(S)
    34.
    发明申请
    REMOTE LASER WELDING OF OVERLAPPING METAL WORKPIECES USING HELICAL PATH(S) 审中-公开

    公开(公告)号：US20180043472A1

    公开(公告)日：2018-02-15

    申请号：US15659092

    申请日：2017-07-25

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David Yang ,  Wu Tao ,  Paolo A. Novelletto ,  Yu Pan ,  Justin Wolsker

    IPC: B23K26/244 ,  B23K26/08

    Abstract: A method of laser welding a workpiece stack-up that includes two or more overlapping metal workpieces is disclosed. The disclosed method includes directing a laser beam at a top surface of the workpiece stack-up to create a molten metal weld pool and, optionally, a keyhole, and further gyrating the laser beam to move a focal point of the laser beam along a helical path having a central helix axis oriented transverse to the top and bottom surfaces of the workpiece stack-up. The gyration of the laser beam may even be practiced to move the focal point of the laser beam along a plurality of helical paths so as to alternately convey the focal point back-and-forth in a first overall axial direction and a second overall axial direction while advancing the laser beam relative to the top surface of the workpiece stack-up along a beam travel pattern.

    COOLING TO CONTROL THERMAL STRESS AND SOLIDIFICATION FOR WELDING OF DISSIMILAR MATERIALS
    36.
    发明申请
    COOLING TO CONTROL THERMAL STRESS AND SOLIDIFICATION FOR WELDING OF DISSIMILAR MATERIALS 审中-公开
    冷却控制热应力和固化用于焊接异型材料

    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。

    SUPPRESSING LASER-INDUCED PLUME FOR LASER EDGE WELDING OF ZINC COATED STEELS
    37.
    发明申请
    SUPPRESSING LASER-INDUCED PLUME FOR LASER EDGE WELDING OF ZINC COATED STEELS 审中-公开
    锌激光激光焊接激光焊接焊丝

    公开(公告)号：US20150202718A1

    公开(公告)日：2015-07-23

    申请号：US14162500

    申请日：2014-01-23

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David Yang ,  David A. Gatny ,  Blair E. Carlson ,  Jeff Wang

    IPC: B23K26/14 ,  B23K26/32

    CPC classification number: B23K26/1437 ,  B23K26/037 ,  B23K26/142 ,  B23K2101/34 ,  B23K2103/08

    Abstract: A system and method for stabilizing the molten pool in a laser welding operation by suppressing a laser-induced plume which occurs when zinc coated steels are laser welded. The plume is a result of vaporization of zinc, and the zinc vapor in the plume disturbs the molten pool and causes blowholes, spattering and porosity. The stabilization is achieved by applying a gas such as air through a nozzle to the weld area, where the gas has sufficient velocity and flow rate to blow the zinc vapor away from the molten pool. Dramatically improved weld quality results have been demonstrated. Configuration parameters which yield optimum results—including gas flow rate and velocity, and nozzle position and orientation relative to the laser impingement location on the steel—are disclosed.

    Abstract translation: 一种用于通过抑制当镀锌钢板被激光焊接时发生的激光引起的羽流在激光焊接操作中稳定熔池的系统和方法。 羽流是锌蒸发的结果，羽流中的锌蒸气会扰乱熔池，造成气孔，飞溅和孔隙。 通过将诸如空气的气体通过喷嘴施加到焊接区域来实现稳定化，其中气体具有足够的速度和流速以将锌蒸气吹离熔池。 已经显示出显着改善的焊接质量结果。 公开了产生最佳结果的配置参数，包括气体流速和速度，以及相对于钢上激光冲击位置的喷嘴位置和取向。

    Method of laser spot welding coated steels
    38.
    发明授权
    Method of laser spot welding coated steels 有权

    公开(公告)号：US11077522B2

    公开(公告)日：2021-08-03

    申请号：US15779743

    申请日：2016-01-18

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David Yang ,  Wu Tao ,  Li Sun

    IPC: B23K26/20 ,  B23K26/32 ,  B23K26/22 ,  B23K26/073 ,  B23K26/322 ,  B23K103/10 ,  B23K103/00 ,  B23K101/34 ,  B23K101/00

    Abstract: A method of laser spot welding a workpiece stack-up that includes at least two overlapping steel workpieces, at least one of which includes a surface coating, is disclosed. The method includes directing a laser beam at the top surface of the workpiece stack-up to create a molten steel weld pool that penetrates into the stack-up. The molten steel weld pool is then grown to penetrate further into the stack-up by increasing an irradiance of the laser beam while reducing the projected sectional area of the laser beam at a plane of the top surface of the workpiece stack-up. Increasing the irradiance of the laser beam may be accomplished by moving a focal point of the laser beam closer to the top surface or by reducing an angle of incidence of the laser beam so as to reduce the eccentricity of the projected sectional area of the laser beam.

    Method for laser welding steel workpieces
    39.
    发明授权
    Method for laser welding steel workpieces 有权

    公开(公告)号：US10953497B2

    公开(公告)日：2021-03-23

    申请号：US16085283

    申请日：2016-11-23

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Hui-Ping Wang ,  Yu Pan ,  Blair E. Carlson ,  Joshua L. Solomon ,  William P. Payne ,  David Yang ,  Wu Tao

    IPC: B23K26/60 ,  B23K26/26 ,  B23K26/322 ,  B23K26/082 ,  B23K26/244 ,  B23K101/00 ,  B23K101/18 ,  B23K101/34 ,  B23K103/04

    Abstract: A method of laser welding a workpiece stack-up (10) of overlapping steel workpieces (12, 14) involves heat-treating a region (64) of the stack-up (10) followed by forming a laser weld joint (66) that is located at least partially within the heat-treated region (64). During heat-treating, one or more pre-welding laser beams (68) are sequentially directed at a top surface (20) of the workpiece stack-up (10) and advanced along a pre-welding beam travel pattern (70) so as to reduce an amount of vaporizable zinc within the stack-up (10). Thereafter, the laser weld joint (66) is formed by directing a welding laser beam (82) at the top surface (20) of the workpiece stack-up (10) and advancing the welding laser beam (82) along a welding beam travel pattern (84) that at least partially overlaps with a coverage area of a pre-welding beam travel pattern (70) or a shared coverage area portion of multiple pre-welding beam travel patterns (70). The method can help reduce an amount of vaporizable zinc within the stack-up (10).

    INTEGRATED PREDRILLING AND LASER SPOT WELDING OF COATED STEELS
    40.
    发明申请
    INTEGRATED PREDRILLING AND LASER SPOT WELDING OF COATED STEELS 审中-公开

    公开(公告)号：US20200316714A1

    公开(公告)日：2020-10-08

    申请号：US16085901

    申请日：2016-04-14

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David Yang ,  Wu Tao

    IPC: B23K26/22 ,  B23K26/322 ,  B23K26/60 ,  B23K26/34 ,  B23K26/082 ,  B23K26/06

    Abstract: A method of laser spot welding a workpiece stack-up (10) includes initially forming at least one hole (74) in the workpiece stack-up and, thereafter, forming a laser spot weld joint (86). The formation of the laser spot weld joint involves directing a welding laser beam (24) at the top surface (20) of the workpiece stack-up to create a molten steel weld pool (98) that penetrates into the stack-up, and then advancing the welding laser beam relative to a plane of the top surface of the workpiece stack-up along a beam travel pattern (102) that lies within an annular weld area (90). The beam travel pattern of the welding laser beam surrounds a center area (96) on the plane of the top surface that spans the at least one hole formed in the workpiece stack-up. The workpiece stack-up includes at least two overlapping steel workpieces, at least one of which includes a surface coating of a zinc-based material. This method can minimize porosity within the weld joint.

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