... Welding Machine(ZX7-400) 1.CE,ISO Certificate 2.Warranty 1 year. 3.Thickness:1.6-5.0mm Inverter DC Arc Welding Machine(ZX7-400) ... 1.CE,OEM Certificate2.Warranty 1 year. 3.Thickness:1.6-5.0mm. ... to interference , good force adjustment3. Stable welding current, low welding spatter4. Good welding result, deep welding pool, high intension5. Protection for over ...