| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a lap laser welding method for galvanized steel sheets having excellent weld bead shape and quality, with which the explosion of a weld metal and the occurrence of a weld defect due to the occurrence of a zinc vapor can be reduced, in lap laser welding of two galvanized steel sheets, and a defect-free lap welded joint of the galvanized steel sheets. <P>SOLUTION: A gap is obtained between the two galvanized steel sheets when performing lap welding by preliminarily bending the one steel sheet by irradiation with a laser beam prior to welding of the two galvanized steel sheets. Both ends of the two steel sheets are restrained and the welding is performed while the stable gap is obtained. By such method, the explosion of the weld metal and the occurrence of the weld defect due to the occurrence of the zinc vapor can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
