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1. (WO2018145222) METHOD FOR LASER WELDING LIGHT METAL WORKPIECES THAT INCLUDE A SURFACE OXIDE COATING

Pub. No.:    WO/2018/145222    International Application No.:    PCT/CN2017/000147
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Fri Feb 10 00:59:59 CET 2017
IPC: B23K 26/28
Applicants: GM GLOBAL TECHNOLOGY OPERATIONS LLC
TAO, Wu
Inventors: TAO, Wu
YANG, David
PAN, Yu
Title: METHOD FOR LASER WELDING LIGHT METAL WORKPIECES THAT INCLUDE A SURFACE OXIDE COATING
Abstract:
A method of laser welding together two or more overlapping light metal workpieces (12, 14, or 12, 150, 14) involves advancing a laser beam (24) relative to the top surface (20) of the workpiece stack-up (10) multiple times along a closed-curve weld path (72). The conductive heat transfer associated with such advancement of the laser beam (24) grows and develops a larger melt puddle (76) that penetrates into the workpiece stack-up (10) and intersects each faying interface (34 or 160, 162) established within the stack-up (10). Upon halting transmission of the laser beam (24) or otherwise removing the laser beam (24) from the closed-curved weld path (72), the melt puddle (76) solidifies into a laser weld joint (66) comprised of resolidified composite workpiece material (78).