... , inverter frequency of 18 KHz, dynamic fast response and easy arc starting, arc stability performance, and pool uniform, minimum spatter, even small current welding ... by 50%. Welding low carbon steel, high-strength steel and Cr-Mo steel, copper, titanium, etc. almost all black metal, weld quality ... ×450650×320×670650×320×670650×320×670650×320×670 IGBT Inverter DC arc welding machine(ZX7 series)