ZX7 Series DC Arc Welder ZX7 Series DC Arc Welder (IGBT Single Tube) Welder Adopt IGBT single tube inveter technology; Control circuit PWM control technology using a reliable, constant resistance, welding current stability, precise control, superior performance; High load duration, continuous welding; The internal structure has three defense functions(dustproof, moisture-proof, anti-corrsion), improve the reliability of the machine in the bad environment; The machine can be used in all types of welds, including acid, alkali, J507, J508, stainless steel electrode.