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公开(公告)号：US11123816B2
公开(公告)日：2021-09-21
申请号：US16212147
申请日：2018-12-06
IPC分类号： B23K11/20 , B23K11/11 , B23K35/02 , B23K103/20
摘要： A resistance spot welding method may involve spot welding a workpiece stack-up that includes a steel workpiece and an aluminum alloy workpiece. A pair of opposed welding electrodes are pressed against opposite sides of the workpiece stack-up with one welding electrode contacting the aluminum alloy workpiece and the other welding electrode contacting the steel workpiece. The welding electrodes are constructed so that, when an electrical current is passed between the electrodes and through the workpiece stack-up, the electrical current has a greater current density in the steel workpiece than in the aluminum alloy workpiece to thereby concentrate heat within a smaller zone in the steel workpiece. Concentrating heat within a smaller zone in the steel workpiece is believed to modify the solidification behavior of the resultant molten aluminum alloy weld pool in a desirable way.
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公开(公告)号：US10953494B2
公开(公告)日：2021-03-23
申请号：US16073536
申请日：2016-03-16
发明人： David Yang , Wu Tao
IPC分类号： B23K26/24 , B23K26/244 , B23K26/073 , B23K26/22 , B23K26/322 , B23K26/082 , B23K26/00 , B23K101/00 , B23K101/18 , B23K101/34 , B23K103/04 , B23K103/10 , B23K103/18
摘要： A method of laser welding a workpiece stack-up (10) that includes at least two overlapping metal workpieces (12, 14) comprises advancing a laser beam (24) relative to a plane of a top surface (20) of the workpiece stack-up (10) from a start point (84) to an end point (86) along a beam travel pattern (78) at a high laser beam travel speed of greater than 8 meters per minute. The two or more overlapping metal workpieces (12, 14) may be steel workpieces or they may be aluminum workpieces, and at least one of the metal workpieces (12, 14) includes a surface coating (40). Advancing the laser beam (24) along the beam travel pattern (78) forms a weld joint (76), which includes resolidified composite workpiece material derived from each of the metal workpieces (12, 14) penetrated by a molten weld pool (80), that fusion welds the metal workpieces (12, 14) together. The relatively high laser beam travel speed contributes to improve strength properties of the weld joint (76).
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公开(公告)号：US10675713B2
公开(公告)日：2020-06-09
申请号：US15659092
申请日：2017-07-25
发明人： David Yang , Wu Tao , Paolo A. Novelletto , Yu Pan , Justin Wolsker
IPC分类号： B23K26/244 , B23K26/082 , B23K26/322 , B23K26/08 , B23K101/34 , B23K103/16
摘要： 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.
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4.发明申请公开(公告)号：US20200047285A1
公开(公告)日：2020-02-13
申请号：US16097689
申请日：2016-05-24
发明人： David Yang , Wu Tao
IPC分类号： B23K26/244 , B23K26/082 , B23K26/04 , B23K26/22 , B23K26/322
摘要： A method of laser welding a workpiece stack-up (10) that includes at least two overlapping steel workpieces, at least one of which includes a surface coating of a zinc-based material. The method includes forming at least one preliminary weld deposit (74) in the workpiece stack-up (10) and, thereafter, forming a principal laser weld joint. The formation of the principal laser spot weld joint involves advancing a principal welding laser beam (90) relative to a plane of the top surface (20) of the workpiece stack-up (10) along a beam travel pattern (104) that lies within an annular weld area (92). The beam travel pattern (104) of the principal welding laser beam (90) surrounds a center area (98) on the plane of the top surface (20) that spans the at least one preliminary weld deposit (74) formed in the workpiece stack-up (10).
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公开(公告)号：US20190061056A1
公开(公告)日：2019-02-28
申请号：US16073536
申请日：2016-03-16
发明人： David Yang , Wu Tao
IPC分类号： B23K26/244 , B23K26/00 , B23K26/073 , B23K26/082 , B23K26/22 , B23K26/322
摘要： A method of laser welding a workpiece stack-up (10) that includes at least two overlapping metal workpieces (12, 14) comprises advancing a laser beam (24) relative to a plane of a top surface (20) of the workpiece stack-up (10) from a start point (84) to an end point (86) along a beam travel pattern (78) at a high laser beam travel speed of greater than 8 meters per minute. The two or more overlapping metal workpieces (12, 14) may be steel workpieces or they may be aluminum workpieces, and at least one of the metal workpieces (12, 14) includes a surface coating (40). Advancing the laser beam (24) along the beam travel pattern (78) forms a weld joint (76), which includes resolidified composite workpiece material derived from each of the metal workpieces (12, 14) penetrated by a molten weld pool (80), that fusion welds the metal workpieces (12, 14) together. The relatively high laser beam travel speed contributes to improve strength properties of the weld joint (76).
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公开(公告)号：US20140144893A1
公开(公告)日：2014-05-29
申请号：US13797604
申请日：2013-03-12
发明人： David Yang
CPC分类号： B23K9/0026 , B23K15/0093 , B23K26/142 , B23K26/322 , B23K2101/34 , B23K2103/08
摘要： Methods for welding a joint are disclosed herein. One example of the method involves welding the joint between two workpieces. Energy is focused onto the joint to weld the joint. The focus of the energy moves relative to the joint. A vaporized material is displaced from a keyhole created by the welding. The vaporized material is vaporized by the energy. A pool of molten material is formed adjacent the keyhole during operation of the energy at the joint. The pool of molten material is manipulated by displacing a portion of the molten material from a near end of the pool and from lateral sides of the pool to a far end of the pool. The far end of the pool is distal to the near end.
摘要翻译： 本文公开了焊接接头的方法。 该方法的一个实例包括在两个工件之间焊接接头。 能量集中在接头上以焊接接头。 能量的重点相对于关节移动。 蒸发的材料从由焊接产生的锁孔移位。 蒸发的物质被能量汽化。 在接头处的能量运行期间，在锁眼附近形成熔融材料池。 通过将熔融材料的一部分从池的近端和从池的侧边移位到池的远端来操纵熔融材料池。 游泳池的远端远近近端。
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公开(公告)号：US10946479B2
公开(公告)日：2021-03-16
申请号：US16089038
申请日：2016-04-14
发明人： David Yang , Wu Tao
IPC分类号： B23K26/22 , B23K26/32 , B23K26/082 , B23K103/10
摘要： A method of laser welding a workpiece stack-up (10) that includes at least two overlapping aluminum workpieces comprises advancing a laser beam (24) relative to a plane of a top surface (20) of the workpiece stack-up (10) and along a beam travel pattern (74) that lies within an annular weld area (82) defined by an inner diameter boundary (86) and an outer diameter boundary (84) on the plane of the top surface (20). The beam travel pattern (74) of the laser beam (24) surrounds a center area encircled by the annular weld area (82) on the plane of the top surface (20) so as to force entrained porosity inwards into a region of the weld joint (72) beneath the center area on the plane of the top surface (20) of the workpiece stack-up (10).
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公开(公告)号：US20200171603A1
公开(公告)日：2020-06-04
申请号：US16614561
申请日：2017-06-13
发明人： David Yang , Wu Tao
IPC分类号： B23K26/244 , B23K26/082 , B23K26/08 , B23K26/06 , B23K26/322 , B23K26/354
摘要： A method of laser welding together two or more overlapping metal workpieces (12, 14, or 12, 150, 14) included in a welding region (16) of a workpiece stack-up (10) involves advancing a beam spot (44) of a laser beam (24) relative to a top surface (20) of the workpiece stack-up along a first weld path (72) in a first direction (74) to form an elongated melt puddle (76) and, then, advancing the beam spot (44) of the laser beam (24) along a second weld path (78) in a second direction (80) that is opposite of the first direction while the elongated melt puddle is still in a molten state. The first weld path and the second weld path overlap so that the beam spot of the laser beam is conveyed through the elongated melt puddle when the beam spot is advanced along the second weld path.
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公开(公告)号：US10195689B2
公开(公告)日：2019-02-05
申请号：US15206856
申请日：2016-07-11
发明人： David Yang , Wu Tao
IPC分类号： B23K26/06 , B23K26/322 , B23K26/21 , B23K26/08 , B23K26/32 , B23K26/082 , B23K26/244 , B23K103/04 , B23K103/10 , B23K103/08 , B23K103/16 , B23K101/00 , B23K101/18 , B23K101/34 , B23K103/20
摘要： A method of laser welding a workpiece stack-up that includes at least two overlapping metal workpieces is disclosed. The method includes advancing a beam spot of a laser beam relative to a top surface of the workpiece stack-up and along a beam travel pattern to form a laser weld joint, which is comprised of resolodified composite metal workpiece material, that fusion welds the metal workpieces together. And, while the beam spot is being advanced along the beam travel pattern, between a first point and a second point, which may or may not encompass the entire beam travel pattern, at least one of the following laser beam parameters is repeatedly varied: (1) the power level of the laser beam; (2) the travel speed of the laser beam; or (3) the focal position of the laser beam relative to the top surface of the workpiece stack-up.
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公开(公告)号：US20180290233A1
公开(公告)日：2018-10-11
申请号：US15483708
申请日：2017-04-10
发明人： Li Sun , David Yang , Xiaochuan Xiong
摘要： An apparatus for trimming a sheet metal workpiece includes a base to support the sheet metal workpiece at a working position on the base. A shearing tool is connected to the base to trim the sheet metal workpiece by mechanically inducing a shearing stress on the sheet metal workpiece to form an edge at an edge location on the sheet metal workpiece. A heater is connected to the base to define a heated region on the sheet metal workpiece by heating at least the edge location on the sheet metal workpiece after the sheet metal workpiece is in the working position. The apparatus includes a temperature sensor to detect a surface temperature of the heated region.
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