针对造成双弧现象的原因，模拟分析了由于电流过大、喷嘴压缩孔径过小和钨极偏心三种因素所导致的双弧现象。

The phenomenon of double arc which is usually caused by the reasons of too big welding current, too small diameter of the nozzle and eccentric of the cathode has been simulated.

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所以，选用尽量小的喷嘴高度对提高切割速度和切割质量都是有益的，但是，喷嘴高度过低时可能会引起双弧现象。

So, choose as far as possible to improve the nozzle of small high cutting speed and cutting quality is useful, but the nozzle at low altitude may cause double arc phenomenon.

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