... high alloy steel, copper, silver, molybdenum ZX7-160S, ZX7-200S, ZX7-250S, ZX7-315S, ZX7-400S, ZX7-500S, ZX7-630SIGBT inverter manual arc welding machineCharacteristics and ... 3A15A18.8A29.3A38A47AEfficiency85%85% 85%85%85%85% 85%Power factor0.950.950.950.950.950.950.95Weight5kg6kg21kg 22kg27kg37kg45kg Overall ... .0-8mm Gas Flow (L/min)25L/min ZX7-400S, ZX7-500S IGBT inverter manual arc welding machine