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本文对方波交流等离子弧焊的主、维弧相互干涉现象进行了研究。理论分析和试验结果表明：主、维弧相互干涉的原因是由于工件极性为负时反极性主电弧与维弧的电场强度、电流流向相异，使钨极和喷嘴表回聚集电荷发生或者有利于主弧（与工件为正时相比，这种有利状态的程度有所降低），不利于维弧；或者相反；或者既个利于主弧，也不利于维弧；或者对两电弧部有利的状态转变，因而导致电弧燃烧不稳定。虽然主、继弧干涉现象与双弧现象个同，但两者产生的原因相同：即都是由于喷嘴电位不能适应主电弧弧柱电场。采用与等高于主电弧极性变化相适应的断续维弧可使喷嘴电位适应主电弧电场，从而圆满地解决方波交流等离子弧焊主、维弧相互干涉问题，并可避免双弧和进一步提高焊缝成型稳定性。
In this paper, the square wave AC plasma arc welding main and arc arc mutual interference phenomena were studied. The theoretical analysis and experimental results show that the main and the dimension arc interfere with each other because the electric field strength of the reverse-polarity main arc and the arc are negative when the workpiece polarity is negative, Or in favor of the main arc (which, to a lesser degree than the positive part of the work piece, is less favorable) is not conducive to the dimensional arc; or vice versa; either in favor of the main arc or in the case of the dimensional arc; or for both arcs The favorable state transitions lead to unstable combustion of the arc. Although the main and subsequent phenomenon of arc interference are the same as those of double arc phenomenon, the two reasons are the same: that is, the nozzle potential can not be adapted to the electric field of the main arc arc column. The intermittent arc with the same polarity as that of the main arc can adapt the nozzle potential to the main arc electric field so as to satisfactorily solve the mutual interference between the main and the arc of the square wave AC plasma arc welding and avoid the problems of double arc and double arc To further improve the stability of weld formation.