Spot-welding method and spot-welded joint of hot-dip galvanized steel sheet

摘要

PPROBLEM TO BE SOLVED: To provide a spot welding method for a galvanized steel sheet capable of improving the life of an electrode. PSOLUTION: In the method, the galvanized steel sheet having a galvanized layer with coating weight of 30 g/mSP2/SPor more and a steel sheet base material with high temperature hardness 70 or more at 500C in Hv(50g) is spot welded using a truncated cone electrode with a tip end diameter of 8 mm or smaller. PCOPYRIGHT: (C)2004,JPO