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    • 81. 发明申请
    • METHOD OF LASER SPOT WELDING COATED STEELS
    • 激光点焊涂层钢的方法
    • WO2017124216A1
    • 2017-07-27
    • PCT/CN2016/071176
    • 2016-01-18
    • GM GLOBAL TECHNOLOGY OPERATIONS LLCYANG, David
    • YANG, DavidTAO, WuSUN, Li
    • B23K26/22
    • B23K26/22B23K26/244B23K26/322
    • A method of laser spot welding a workpiece stack-up(10) that includes at least two overlapping steel workpieces(12,14), at least one of which includes a surface coating(40), is disclosed. The method includes directing a laser beam(24) at the top surface(20) of the workpiece stack-up(10) to create a molten steel weld pool(90) that penetrates into the stack-up(10). The molten steel weld pool(90) is then grown to penetrate further into the stack-up(10) by increasing an irradiance of the laser beam(24) while reducing the projected sectional area(86) of the laser beam(24) at a plane of the top surface(20) of the workpiece stack-up(10). Increasing the irradiance of the laser beam(24) may be accomplished by moving a focal point(62) of the laser beam(24) closer to the top surface(20) or by reducing an angle of incidence(82) of the laser beam(24) so as to reduce the eccentricity of the projected sectional area(86) of the laser beam(24).
    • 激光点焊包括至少两个重叠的钢制工件(12,14)的工件堆叠体(10)的方法,所述工件堆叠体中的至少一个包括表面涂层(40),所述方法包括: 披露。 该方法包括将激光束(24)引导到工件堆叠(10)的顶表面(20)以形成穿透堆叠(10)的钢水熔池(90)。 然后通过增加激光束(24)的辐照度,同时减小激光束(24)的投影截面积(86),同时使熔融钢熔池(90)生长以进一步穿透堆叠体 工件堆叠(10)的顶面(20)的平面。 通过将激光束(24)的焦点(62)移动得更靠近顶表面(20)或通过减小激光束(24)的入射角(82)来实现增加激光束(24)的辐照度 (24),以便减小激光束(24)的投影截面积(86)的偏心率。
    • 83. 发明申请
    • LASER SPOT WELDING OF OVERLAPPING ALUMINUM WORKPIECES
    • 重叠铝工件的激光点焊
    • WO2017075808A1
    • 2017-05-11
    • PCT/CN2015/094003
    • 2015-11-06
    • GM GLOBAL TECHNOLOGY OPERATIONS LLCYANG, David S.
    • YANG, David S.TAO, WuZHANG, JingWOLSKER, Justin A.
    • B23K26/22B23K26/32
    • B23K26/22B23K26/082B23K26/32B23K2203/10
    • 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.
    • 激光焊接包括至少两个重叠的铝工件(12,14)的工件堆叠体(10)的方法包括使激光束(24)相对于顶表面 (10)的工件(20)并且沿着包括一个或多个非线性内部焊接路径的点焊接行进图案(74)以及围绕所述一个或多个非线性内部焊接路径的外部周边焊接路径。 激光束(24)沿着点焊行进图案(74)的这种前进沿着相对于工件堆叠的顶表面(20)的对应路线平移键孔(78)和周围的熔融铝熔池(76) (10)。 沿着点焊行进图案(74)推进激光束(24)形成焊接接头(72),该焊接接头包括源自被周围熔融铝焊缝穿透的每个铝工件(12,14)的固化复合铝工件材料 (76),将铝制工件(12,14)熔合在一起。