研究了直流反极性脉冲ＭＡＧ（活性气体保护）焊在不同配比的Ａｒ＋ＣＯ２，Ａｒ＋Ｏ２时，电弧的静特性、脉冲参数以及形成脉冲旋转喷射过渡临界规范值的变化。结果表明，气体成分及配比不同时，电弧静特性曲线位置不同，在其它条件相同的情况下，Ａｒ＋２％Ｏ２的脉冲电流最高，最易形成脉冲旋转喷射过渡；Ａｒ＋２０％ＣＯ２的脉冲电流最低，不能形成脉冲旋转喷射过渡 The static characteristics of the arc, the pulse parameters and the change of the critical criterion for the formation of pulsed jet transition were studied when the DC reverse polarity pulse MAG (reactive gas protection) was applied to Ar + CO2 and Ar + O2 with different ratios. The results show that when the gas composition and the ratio are different, the static characteristic curve of the arc is different. Under the same conditions, the pulse current of Ar + 2% O2 is the highest, and the transition pulse jet is the most easy to form. The pulse current of Ar + 20% CO2 is the lowest, Can not form a pulse rotation jet transition