... nickel-cadmium, button battery spot welder spot welding machine Multi-pulse precision spot welding machine Lithium-ion,Ni-MH, nickel-cadmium, ... solder joint beauty. 7 segments LED show each welding parameter. UP-23 use dual-cylinder action, table-free-class ... voltage automatically, tracking compensation. UP-23 have large power, simple operation, reliable welding.2, The application of weldingLithium ...