Laser lap welding method of aluminum galvanized steel sheet and aluminum galvanized steel sheet for laser lap welding

摘要

PPROBLEM TO BE SOLVED: To provide a laser lap welding method for an aluminum-based galvanized steel sheet, a method reducing generation of weld defect due to vaporization of the galvanizing components at the time of the welding, and also to provide an aluminum-based galvanized steel sheet for laser lap welding. PSOLUTION: In the laser lap welding method for an aluminum-based galvanized steel sheet; a gap (X) of a lap welding zone, a steel sheet thickness (Y), and total zinc deposits (Z) on the lap surfaces satisfy the relations of XZ/(10000Y) and X0.35Y; or further, a gap is provided in the lap weld zone so that the total length (L) of the parts fulfilling these relations satisfy LA0.3/Y relative to the laser welding line length (A). In addition to the laser lap welding method, the invention includes the aluminum-based galvanized steel sheet suitable for this method. PCOPYRIGHT: (C)2004,JPO