... 100 W, as compared with conventional welding machine, to save electricity by 50%. Welding low carbon steel, high-strength steel and Cr-Mo steel ... , copper, titanium, etc. almost all black metal, weld quality can be ... ×250×450650×320×670650×320×670650×320×670650×320×670 IGBT Inverter DC arc welding machine(ZX7 series)