... frequency and high quality 3.One year warrenty IGBT inverter DC arc welder machine ZX7-315L1.CCC approval2.High frequency and ... a generator power.Using the most advanced inverter technology well-produced,inverter frequency up to 100Hz,faster dynamic response. ... strong,stable and reliable welding current.With trust compensation function,arc stability,welding pool uniform,minimum spatter,weld appearece ...