RESISTANCE SPOT WELDING METHOD FOR HOT DIP GALVANIZED STEEL SHEET AND NON-PLATED STEEL SHEET

摘要

PPROBLEM TO BE SOLVED: To provide a spot welding method by which a long electrode life in excess of 4,000 continuous spot points can be obtained, in the spot welding of a hot dip galvanized steel sheet and a non-plated steel sheet. PSOLUTION: The resistance spot welding of a hot dip galvanized steel sheet A with ≥30 g/mSP2/SPcoating weight on the side in contact with an electrode to a non-plated steel sheet B, is performed in such a manner that the thickness of the steel sheet A is 0.3-1.0 mm while that of the steel sheet B is ≥0.5 mm, that the electrode to be used is made of alumina dispersed copper, and that the energizing conditions satisfy the following: welding current ≥ lower limit current + 1 kA; energizing time 0.08-0.4 sec. PCOPYRIGHT: (C)2006,JPO&NCIPI