| 摘要 |
Provided is a resistance spot welding method that, when performing resistance spot welding of a plate assembly resulting from overlapping a steel plate and an aluminum plate, is able to secure the connection properties of the steel plate and aluminum plate by means of the same production step as when welding steel plates together, and can secure weld stability even in the case of electrode wear during continuous welding. When performing resistance spot welding of a plate assembly in which plurality of steel plates and aluminum plates are overlapped, one plate disposed at the outermost side being a steel plate, and the other being an aluminum plate, the relationship between the tip diameter (DFe) of the electrode contacting the steel plates and the tip diameter (DAl) of the electrode contacting the aluminum plates satisfies DFe < DAl, and the tip shape of the electrode contacting the aluminum plate is a flat shape, a convex shape having a tip radius of curvature of at least 170 mm, or a concave shape having a tip radius of curvature of at least 10 mm. |
