| 摘要 |
PROBLEM TO BE SOLVED: To provide a spot welding method for a high-strength steel sheet, which prevents defects and cracks from being produced even in welding thick high-strength steel sheets by a resistance spot welding method and forms a highly reliable welded metal part while securing satisfactory working efficiency.SOLUTION: In welding, by a resistance spot welding method, high-strength steel sheets 1A, 1B having a tensile strength of 900-1,850 MPa and a thickness of 1.8-2.8 mm, energization for welding is conducted with a condition in which pressurizing force EF of welding electrodes 2A, 2B for the high-strength steel sheets 1A, 1B is expressed in the following formula, {1,960×t≤EF≤2,940×t}, and then, successively, with the pressurizing force EF left as is, the high-strength steel sheets 1A, 1B are held with the welding electrodes 2A, 2B for a holding time HT which is expressed in the following formula, {160≤HT≤300}; wherein in the respective formulas; t denotes thickness (mm) of the high-strength steel sheets; EF denotes the pressurizing force (N) of the welding electrodes for the high-strength steel sheets; and HT denotes the holding time (ms). |
