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1. (WO2018145221) METHOD FOR SMOOTHING THE SURFACE OF A LASER WELD JOINT

Pub. No.:    WO/2018/145221    International Application No.:    PCT/CN2017/000146
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Fri Feb 10 00:59:59 CET 2017
IPC: B23K 26/20
Applicants: GM GLOBAL TECHNOLOGY OPERATIONS LLC
PAN, Yu
Inventors: PAN, Yu
YANG, David
TAO, Wu
NOVELLETTO, Paolo
Title: METHOD FOR SMOOTHING THE SURFACE OF A LASER WELD JOINT
Abstract:
A method for joining together metal workpiece (12,14 or 12,150, 14) includes forming a laser weld joint (66) in a workpiece stack-up (10) that fusion welds two or more overlapping metal workpiece (12,14 or 12,150 or 14) together. The laser weld joint (66) has an initial top surface (76). Once the laser weld joint (66) is formed, the method calls for impinging the laser weld joint (66) with a laser beam (24) and moving the laser beam (24) along the initial top surface (76) of the laser weld joint (66) to melt an upper portion (78) of the joint (66) including the initial top surface (76). The laser beam (24) is eventually removed from the laser weld joint (66) to allow the melted upper portion (78) of the joint (66) to resolidify and provide the laser weld joint (66) with a modified top surface (84) that is smoother than the initial top surface (76). By providing the laser weld joint with a smoother modified top surface, residual stress concentration points are removed and the laser weld joint is less liable to damage seal strips.