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Due to the high hardness and high brittleness of the high-strength automotive sheet itself, there is a greater tendency for interface fracture failure during the spot welding process, by studying the welding performance of automobile plates under different spot welding process parameters, the fracture failure of high-strength automobile plate spot welding joints is divided into three categories,It is typical failure mode of spot welded joints for automotive plates, high-strength automotive plate spot welded joint are mainly divided into three failure modes: interface fracture, fusion line fracture and heat- affected zone fracture.Among, the interface mode of (a) is interface fracture, the fracture of the spot welded joint has penetrated the entire fusion zone, and the macroscopic fracture is relatively flat; (b) the interface mode is fusion line fracture. The fracture position of the spot welded joint is at the fusion line. The macroscopic morphology of the fracture indicates that the fracture is not flat, but consistent with the direction of tensile and shear forces and formed with the plane of the steel plate. Deflection at a certain angle; The interface fracture mode of (c) is heat-affected zone fracture. The fracture position of the spot welded joint is located in the softening zone, that is, at the junction of the base material zone of the heat-affected zone, and the nugget is completely pulled out.
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