| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection welding method of the surface treated steel capable of satisfactorily preventing plating damages taking into consideration not only the projection welding at multiple points but also the participation of the distortion caused by the projection in the plating damages in achieving the projection welding of the surface treated steel sheet of around 1 mm in thickness. SOLUTION: In a projection welding method of a surface treated steel sheet of 0.8 mm-1.2 mm in thickness T, two or three circular projections 2 of the projecting curved surface in which the diameter D is (2-4)√T (mm), the maximum expansion height H is (0.7-0.9) T, preferably, (0.8-0.9) T, and the raditus R of curvature satisfies the formula R:(D<2> /8H)+2H, are formed, and these two or three positions are simultaneously welded.
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