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, ...