... spot welder 2).easy to operate 3).ISO9001:2000 Capacitor spot and projection welder stores the electric energy in the ... for welding.1.Vast Application:it is able to weld up to 3mm stainless steel and nonferrous metals like ... like copper and aluminum etc 2.Firm and beautiful weld:firm welding ,no black on welding spot,no gringding ... welding capacity ,therefore ,it is low cost. laser welding machine