LASER LAP WELDING METHOD FOR TIN-BASED GALVANIZED STEEL SHEET, AND VICE VERSA

摘要

PPROBLEM TO BE SOLVED: To provide a laser lap welding method for a tin-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 a tin-based galvanized steel sheet for laser lap welding. PSOLUTION: The laser lap welding method for a tin-based galvanized steel sheet is characterized in that 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/(8000Y) and X0.35Y, or additionally, in that 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). Further, the invention includes the tin-based galvanized steel sheet suitable for this laser lap welding method. PCOPYRIGHT: (C)2004,JPO