ZX7-250, 315,400,500 Series inverter DC welding machine, using high-power high-tech imports as the main switching element IGBT inverter technology, frequency 50Hz to 50KHz high frequency alternating current into alternating current, and then high frequency transformers, high frequency devices such as step-down rectifier and rectifier, DC power output can be welded. Welding is not only the weight, size and power consumption and other indicators of revolutionary change, and its superior welding characteristics, the system dynamic response and control accuracy are greatly improved. Can be welded carbon steel, alloy steel, stainless steel, copper, titanium and its alloys and other metals.