Abstract: The influences of pulse current, pulse time, pulse frequency and other parameters on the weld formation and the stability of welding process were analyzed by using there-factor and three-level orthogonal test, combined with high-speed photography, welding electrical parameter acquisition, metallographic detection and other means. The results showed that among the three pulse parameters, the pulse frequency had a great effect on the penetration and welding stability, while the pulse current had a great effect on the weld width.