RESISTANCE SPOT WELDING METHOD AND WELDED STRUCTURE

摘要

Provided is a resistance spot welding method in which a stacked body (10) that is configured from steel plates (1a, 1b) and that satisfies the formula (i) that is indicated below is sandwiched by a pair of electrodes (2a, 2b) and pressed while being electrified in order to form a welded section (4b) on a steel plate interface (4) and thereby join the steel plates (1a, 1b). Specifically, an electrification point (4a) is formed on the steel plate interface (4) and spot welding is performed so that the welded section (4b) is formed to a distance (W) in the horizontal direction from the electrification point (4a) that is within 20 mm. Formula (i): (TS1 × t1 + TS2 × t2)/(t1 + t2) ≥ 440. TS1 represents the tensile strength (MPa) of the steel plate (1a), t1 represents the plate thickness (mm) of the steel plate (1a), TS2 represents the tensile strength (MPa) of the steel plate (1b), and t2 represents the plate thickness (mm) of the steel plate (1b).