公开(公告)号：US10010966B2

公开(公告)日：2018-07-03

申请号：US14181020

申请日：2014-02-14

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David S. Yang ,  David R. Sigler ,  Blair E. Carlson ,  James G. Schroth ,  Michael J. Karagoulis

IPC: B23K9/24 ,  B21D39/00 ,  B23K11/20 ,  B23K11/11 ,  B23K11/30 ,  B23K35/02 ,  B23K103/20

CPC classification number: B23K11/20 ,  B23K11/115 ,  B23K11/3009 ,  B23K11/3018 ,  B23K35/0205 ,  B23K35/0261 ,  B23K2103/20

Abstract: A method of spot welding a workpiece stack-up that includes a steel workpiece and an aluminum alloy workpiece involves passing an electrical current through the workpieces and between welding electrodes that are constructed to affect the current density of the electrical current. The welding electrodes, more specifically, are constructed to render the density of the electrical current greater in the steel workpiece than in the aluminum alloy workpiece. This difference in current densities can be accomplished by passing, at least initially, the electrical current between a weld face of the welding electrode in contact with the steel workpiece and a perimeter region of a weld face of the welding electrode in contact with the aluminum alloy workpiece.

公开(公告)号：US20170304925A1

公开(公告)日：2017-10-26

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

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.

公开(公告)号：US20180304405A1

公开(公告)日：2018-10-25

申请号：US15767080

申请日：2015-11-06

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David S. Yang ,  Jing Zhang ,  Wu Tao ,  Justin A. Wolsker

IPC: B23K26/22 ,  B23K26/082 ,  B23K26/32

CPC classification number: B23K26/22 ,  B23K26/082 ,  B23K26/32 ,  B23K2103/10

Abstract: A method of laser welding a workpiece stack-up (10) that includes at least two overlapping aluminum workpieces (12, 14) comprises advancing a laser beam (24) relative to a plane of a top surface (20) of the workpiece stack-up (10) and along a spot weld travel pattern (74) that includes one or more nonlinear inner weld paths and an outer peripheral weld path that surrounds the one or more nonlinear inner weld paths. Such advancement of the laser beam (24) along the spot weld travel pattern (74) translates a keyhole (78) and a surrounding molten aluminum weld pool (76) along a corresponding route relative to the top surface (20) of the workpiece stack-up (10). Advancing the laser beam (24) along the spot weld travel pattern (74) forms a weld joint (72), which includes resolidified composite aluminum workpiece material derived from each of the aluminum workpieces (12, 14) penetrated by the surrounding molten aluminum weld pool (76), that fusion welds the aluminum workpieces (12, 14) together.

公开(公告)号：US20180141158A1

公开(公告)日：2018-05-24

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

CPC classification number: B23K26/244 ,  B23K2101/34 ,  B23K2103/04 ,  B23K2103/08

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.

公开(公告)号：US20170239750A1

公开(公告)日：2017-08-24

申请号：US15506113

申请日：2014-08-25

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David S. Yang ,  Justin A. Wolsker ,  Bradley J. Blaski ,  Jeff Wang ,  Jing Zhang ,  Wu Tao

IPC: B23K26/244 ,  B23K26/10 ,  B23K26/16

CPC classification number: B23K26/244 ,  B23K26/082 ,  B23K26/10 ,  B23K26/16 ,  B23K2101/006 ,  B23K2101/18 ,  B23K2103/04 ,  B23K2103/08 ,  B23K2103/10 ,  B23K2103/12

Abstract: A method of laser welding a workpiece stack-up includes directing a laser beam at a top surface of a first metal workpiece to form a key-hole that entirely penetrates the workpiece stack-up, including an underlying second metal workpiece, so that the keyhole reaches a bottom surface of the second metal workpiece. A zone of negative pressure established under the bottom surface of the second metal workpiece extracts vapors that are produced by the laser beam. The vapors, in particular, are extracted from the bottom surface of the second metal workpiece through the keyhole. A bottom workpiece holder that supports the bottom metal workpiece during laser welding may be constructed to establish the zone of negative pressure.

公开(公告)号：US20150231729A1

公开(公告)日：2015-08-20

申请号：US14181020

申请日：2014-02-14

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David S. Yang ,  David R. Sigler ,  Blair E. Carlson ,  James G. Schroth ,  Michael J. Karagoulis

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

CPC classification number: B23K11/20 ,  B23K11/115 ,  B23K11/3009 ,  B23K11/3018 ,  B23K35/0205 ,  B23K35/0261 ,  B23K2103/20

Abstract: A method of spot welding a workpiece stack-up that includes a steel workpiece and an aluminum alloy workpiece involves passing an electrical current through the workpieces and between welding electrodes that are constructed to affect the current density of the electrical current. The welding electrodes, more specifically, are constructed to render the density of the electrical current greater in the steel workpiece than in the aluminum alloy workpiece. This difference in current densities can be accomplished by passing, at least initially, the electrical current between a weld face of the welding electrode in contact with the steel workpiece and a perimeter region of a weld face of the welding electrode in contact with the aluminum alloy workpiece.

Abstract translation: 对包括钢工件和铝合金工件的工件叠层进行点焊的方法包括使电流通过工件和焊接电极之间，其被构造为影响电流的电流密度。 更具体地说，焊接电极被构造成使得钢工件中的电流密度比铝合金工件中的电流密度更大。 电流密度的这种差异可以通过使焊接电极的与焊接工件接触的焊接面和焊接电极的与焊接接触的焊接面的周边区域的至少最初的电流通过， 工件。