SPOT WELDING METHOD AND SPOT WELDING EQUIPMENT

PROBLEM TO BE SOLVED: To improve weld quality by forming enough nugget between plate materials even when a joint part, which is formed by overlaying a thin plate on the outside of a plurality of thick plates, is bent.SOLUTION: The joint part Q consisting of a plurality of the thick plates P1 and P2 and the thin plate P3 is spot-welded. Spot welding equipment 10 includes a welding gun body 11 provided with: first and second welding electrodes 12 and 15 facing each other; and an electrode driving actuator 13 which drives the welding electrode 15 in an axial direction. A pressurizing arm 22 is swingably loaded on a supporting plate 18 driven by a pressurizing actuator 16 in the axial direction, and a pressurizing piece 25, contacting a portion adjacent to the welding electrode 15 in the thin plate P3, is provided to the pressurizing arm. The pressurizing arm 22 is swung to displace the posture of the pressurizing piece 25 to the joint part, thereby preventing the interference of the pressurizing piece 25 and the pressurizing arm 22 with a workpiece W.