Abstract: In order to reduce the impact of electromagnetic force in double-wire welding and the probability of breaking arc during switching between peak current and basic current, a symmetrical transition waveform control process for double-wire MIG welding is proposed.The new process tries to improve symmetrical transition during the change of double-wire phase, and introduce three control parameters:leading-wire transition current I_s1, double-wire transition time T_s and trailing-wire transition current I_s1.Orthogonal experiment was designed and the results were analyzed and assessed by range analysis method.It shows that the impacts of I_s1, T_s and I_s1 on welding quality decrease in turn.Further verification test shows that the range of operating point is wider, the welding process is more smooth and soft, and weld surface produces a glossy transition zone.This paper provides a new idea for waveform control of double-wire welding.