在电弧功率或电流相等的条件下,使用的喷咀孔径越小,电弧压缩效果越好,能量密度也越高。而用小孔径喷咀切割,切缝窄、切口表面质量好,电能也省。但是,目前国内使用小孔径喷咀有一定困难,这主要是由于电源动特性不合适引起起弧脉冲烧坏喷咀;喷咀冷却不好而 Under the conditions of equal arc power or current, the smaller the nozzle diameter used, the better the arc compression effect and the higher the energy density. With a small aperture nozzle cutting, cutting narrow, good quality incision surface, the power is also saved. However, the current domestic use of small aperture nozzle has some difficulties, mainly due to improper dynamic characteristics of the power supply caused by arc pulse burning nozzle; nozzle cooling is not good