| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce weld defects such as a blow hole by making zinc vapor produced from the plated layer be easily released when the zinc-based plated steel sheets are overlapped and are subjected to laser welding. <P>SOLUTION: A projecting and recessed shape the projecting part of which has a circular-arcuate cross-sectional top part so as to satisfy S<SB>1</SB>/S<SB>2</SB>≤1 and 0.04≤G/t≤0.10, wherein S<SB>1</SB>represents the width of a projecting part, S<SB>2</SB>represents the width of a remaining recessed part, G represents the gap between the sheets in a lap joint and the thickness on the thin side of the lap joint, is formed on the surface of one sheet of the steel sheets to be welded, and two steel sheets are overlapped and the laser welding is performed. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
