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介绍了一种适合于铝镁及其合金焊接的变极性等离子弧焊新技术．此技术与由一台逆变电源为主弧电流供电、主弧正负半波共享一个电流通道等离子弧的传统技术相比，最大的不同是主弧正负半波电流由２台直流电源供电，正负半波电流分别流经２个不同的电流通道，对工件（铝）实现了变极性电流焊接．它的负半波不仅避免了传统技术因主、维弧相互干涉而造成的电弧不稳定，而且具有可靠的阴极清理作用．正负半波对焊缝成形的对比实验表明，正半波对焊缝成形起决定性作用，而负半波的影响很小，主要作用是完成对工件氧化膜的清理．
A new technique of variable polarity plasma arc welding suitable for the welding of Al-Mg and its alloys is introduced. The main difference between the technology and the traditional technology that the main arc is powered by one inverter and the positive and negative half-wave of the main arc shares a current channel plasma arc is that the main arc positive and negative half-wave current is supplied by two DC power supplies , Positive and negative half-wave current flows through two different current channels, the workpiece (aluminum) to achieve a variable polarity current welding. Its negative half-wave not only avoids the arc instability caused by the mutual interference of the main and the dimension arcs in the conventional technology, but also has a reliable cathode cleaning effect. Positive and negative half-wave on the weld forming experiments show that the positive half-wave on the weld forming a decisive role, while the negative half-wave has a small effect, the main role is to complete the workpiece oxide film cleaning.