1) DC TIG INVERTER WELDING MACHINE 2) POWER SAVING welding MACHINE 3) HIGH EFFICIENCY ... low carbon steel, carbon steel, alloy steel, etc.; Advanced inverter technology: Inverter frequency up to 100KHz, conversion rate of 85%, no-load ... ,carbon steel,copper and other nonferrous metals.4) can use various different specification and materials of electrode,including acidity, alkalescence and ...