pneumatic spot welding machine, fast welding frequency, air cylinder driven Features and Applications1 Integrating ... which is adjustable from 20%~100%Three pulses (preheat, welding, temper) welding function: current increase, decrease and main pulse multi-cycle ... 5 high efficiency welding of various low-carbon steel, stainless steel and nonferrous steel sheet, tube, wires and meshes. Welding Machine