A METHOD FOR RESISTANCE SPOT WELDING OF ZINC-COATED HIGH STRENGTH STEELS

摘要

A resistance spot welding electrode with a tip zone (Z) having an active diameter d_EL allowing current flow during resistance spot welding, comprising a circular central zone (C) (1) with a flat or hemispherical surface, the diameter of the central zone (C) (1) being d_C, an annular peripheral circular zone (P) (2) concentric with the circular zone (C) (1), having a flat surface, the width of annular peripheral zone (P) (2) being d_P, the central zone (C) protruding with respect to the peripheral zone (P) (2), the protrusion height (5) between the central zone (C) (1) and the external part (22) of the annular peripheral zone (P) being h, an annular circular transition zone (T) (3) concentric with the central zone (C) (1), located between the central zone (C) (1) and the peripheral zone (P) (2), the width (31) of the annular transition zone (T) (3) being d_T, wherein d_C, d_P, d_T, h, are such as: d_EL= d_C+2d_T+2d_P, d_c0, d_P0, d_T≥0, h0, 0.20 d_C/d_EL 0.60, 0.05 ≤ (d_P–h)/ (d_EL ≤ 0.25.