ZX7 250 Inverter DC arc welding machine rates input:380V/15A No-load volt:54V ... ,easy to arc initiation,resistant to interference,stable arc,low welding noice,little welding spatter,deep melting pool,high welding strength,good welding quality. 2 ... ,resistant to voltage pulsation.stale and reliable welding current.3.Small DC are welding machine especially adopts proportional thrust control technology, ...