Search International and National Patent Collections

1. (WO2017177410) LASER SPOT WELDING OF OVERLAPPING ALUMINUM WORKPIECES

Pub. No.:    WO/2017/177410    International Application No.:    PCT/CN2016/079226
Publication Date: Fri Oct 20 01:59:59 CEST 2017 International Filing Date: Fri Apr 15 01:59:59 CEST 2016
IPC: B23K 26/22
B23K 26/32
Applicants: GM GLOBAL TECHNOLOGY OPERATIONS LLC
YANG, David
Inventors: YANG, David
TAO, Wu
Title: LASER SPOT WELDING OF OVERLAPPING ALUMINUM WORKPIECES
Abstract:
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).