关键词: 热成型钢；可焊性；工艺参数；力学性能

Abstract: Hot-formed steel is prone to spot welding problems such as weak welding and serious spatter. To study the weldability analysis of hot-formed steel and the influence of parameters on the mechanical properties of joints, a 1.0 mm thick B1500HS steel plate is used for testing. Research has shown that B1500HS steel plate has good weldability. The strength of the solder joint shows a trend of first increasing and then decreasing with the increase of welding current. The maximum shear force of soft specification solder joints is higher than that of hard specification solder joints. The welding time is between 240 and 300 ms, and the welding joint strength is the highest when the welding current is between 9.5 and 10.0 kA. There is a certain proportion of probability of interface fracture when hot-formed steel is subjected to shear force. The strength of interface fracture under shear test environment is below 12.07 kN, and the strength of button fracture is between 12.14 and 17.42 kN. The safety performance of the body structure is higher when the button is broken.

Key words: Hot-formed steel; Weldability; Process parameters; Mechanical properties