LASER WELDING METHOD, LASER WELDING DEVICE, AND WELDED MEMBER

摘要

A laser welding method for welding multiple metal members to each other by irradiating laser light (51) on a region where the multiple metal members have been superposed. The method comprises and pre-treatment process and a welding process. The occurrence of blow holes is limited and favorable welds are obtained by: forming at least one of the multiple metal members from a metal-plated steel plate in which the base metal has been covered with a coating material that has a melting point lower than the base metal; in the pre-treatment process, with the position of a first metal member (21) in the in-plane direction fixed, performing processing from the front surface (21a) of the first metal member to form on the back surface (21b), which is the other side, a protruding section (23) that bulges from the back surface; and thereafter, in the welding process, superposing the first metal member in which the protruding section (23) has been formed on a second metal member (22) with the protruding section therebetween while maintaining the position in the in-plane direction, and irradiating laser light on the superposed region to weld the multiple metal members to each other.