... -load voltage:54V Inverter AC&DC square wave tig welding machine TIG250ACDCFunction and feature: Small size, light weght ... freqency arc striking,easy to operate, strong welding permeability The MMA welding machine installs arc thrust adjusting function,easy ... noisyless,little spatter,no magnetic biasing,good welding surface Suitable for various welding rod, be able to weldcarbon steel,stainless steel ...