汽车用热成型钢和双相钢电阻点焊可焊性分析

Weldability Analysis of Resistance Spot Welding of Hot-formed Steel and Dual-phase Steel for Automobiles

为研究汽车用热成型钢和双相钢的焊接性能差异,采用1.5 mm热成型钢HS1300T、1.5 mm双相钢DP590T分别与1.9 mm冷轧钢板CR1180T进行电阻点焊焊接,对两种板材可焊性窗口、焊点一致性以及焊点宏观形貌进行研究。研究表明,双相钢比热成型钢可焊性电流窗口更大。连续焊接500个焊点,热成型钢板更容易发生飞溅,飞溅点数是双相钢的3.72倍;最优焊接参数下热成型钢焊点压痕深度较深,为双相钢的2.62倍;热成型钢焊核更易形成缩孔。在焊接工况一致的情况下,双相钢相较于热成型钢可焊性更好。

In order to study the difference of welding properties between hot-formed steel and dual-phase steel for automobile,1.5 mm hot-formed steel HS1300T and 1.5 mm dual-phase steel DP590T were respectively used for resistance welding with 1.9 mm cold-rolled steel plate CR1180T,and the weldability interval,weld consistency and macroscopic morphology of welds were studied.Studies have shown that dual-phase steels have a larger weldability current range than hot-formed steels.Continuous welding of 500 welds,hot-formed steel plate are more prone to spatter,and the weld numbers of spatter is 3.72 times that of duplex steel.Under the optimal welding parameters,the indentation depth of the hot-formed steel is deeper,which is 2.62 times that of the dual-phase steel and the hot-formed steel is easier to form shrinkage cavity.Under the same welding conditions,the weldability of dual-phase steel is better than that of hot-formed steel.