LASER BEAM WELDING OF PLATED STEEL SHEET AND STAINLESS STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To form a weld zone capable of bending after welding at the case of laser beam welding a plated steel sheet and stainless steel sheet. SOLUTION: In the case of laser beam welding the plated steel sheet and stainless steel sheet without a filler wire, the end surfaces of the plated steel sheet and the austenitic stainless steel sheet, whose carbon equivalent Ceq of the original sheet calculated with the formula Ceq =%C+%Mn/6+%Si/24+%Ni/24+%Cr/5+%Mo/4 is 0.3%, are mutually butted. And when the thickness of thicker sheet in the plated steel sheet and austenitic stainless steel sheet is meant by T and the width of welded metal formed in the butted part is meant by W, the laser beam welding is executed under the heat input condition being W=T. By this way, the welded metal excellent in ductility is formed and no crack is generated at the time of bending.