等离子弧是一种压缩电弧。在各种用途的等离弧枪体中,电弧大部分是在钨制阴极和水冷铜阳极(喷咀)间形成的。这种电弧在喷咀孔道中被压缩后从喷咀射出,这种被压缩的电弧是由被电场充份解离了的电中性等离子体所组成,称此电弧为等离子弧。等离子弧在形成中会受到三种压缩,喷咀孔道直径限止所形成的压缩为机械压缩。 Plasma arc is a kind of compression arc. In various types of arc plasma guns, the arc is mostly formed between a tungsten cathode and a water-cooled copper anode (nozzle). This arc is compressed in the orifice of the nozzle and exits the nozzle. The compressed arc is made up of an electrically neutral plasma that has been sufficiently dissociated by the electric field. This arc is called a plasma arc. The plasma arc is subject to three types of compression during formation, and the restriction of the orifice diameter of the nozzle creates a compression that is mechanical.