... CE/ISO certificate 3.Warranty:1 year 4.Delivery time:15 days 5.MOQ:1 for sample Product Description: ... .With little no-load loss, compared to traditional welder, it can save electricity about 50%.Inverter frequency ... reaches 20Khz, high dynamic response, easy to strike arc.Arc is stable with low noise, deep molten hole, ... product, please feel free to contact us. ARC-250 (IGBT) Inverter DC Arc Welder