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1. (WO2018061526) METHOD OF MANUFACTURING LASER WELDED JOINT, LASER WELDED JOINT, AND AUTOMOTIVE FRAME COMPONENT

Pub. No.:    WO/2018/061526    International Application No.:    PCT/JP2017/029899
Publication Date: Fri Apr 06 01:59:59 CEST 2018 International Filing Date: Wed Aug 23 01:59:59 CEST 2017
IPC: B23K 26/21
B23K 26/00
B23K 26/32
B62D 25/04
C22C 38/00
C22C 38/38
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: HARA Asato
原 亜怜
KITANI Yasushi
木谷 靖
Title: METHOD OF MANUFACTURING LASER WELDED JOINT, LASER WELDED JOINT, AND AUTOMOTIVE FRAME COMPONENT
Abstract:
Provided is a method of manufacturing a laser welded joint with which the occurrence of cracking in a bead terminal end portion is suppressed, and which has an excellent appearance. In this method of manufacturing a laser welded joint, for obtaining a laser welded joint by laser welding two steel sheets that are stacked vertically on one another with a gap therebetween, formula (1) is satisfied when t1 is the thickness of the upper steel sheet, t2 is the thickness of the lower steel sheet, a is the width of a gap between the upper steel sheet and the lower steel sheet, initial welding is a step of forming a bead from a bead start end to approximately 1/5 of the total length of the bead, main welding is a step of forming the bead, as a continuation of initial welding, to approximately 4/5 of the total length of the bead, final welding is a step of forming the bead, as a continuation of main welding, to a bead terminal end, P is the laser output during initial welding and main welding, and Pf is the laser output during final welding. 0.8((t1+t2)/(K+t1+t2))P