... % 3) long time continue working Good performance MMA-250T DC inverter welder Use: light manufacturing, maintenance, civil steel structure installation; Weldable materials ... low carbon steel, carbon steel, alloy steel, etc.; Advanced inverter technology: Inverter frequency up to 100KHz, conversion rate of 85%, no-load ... *23.5*27535*285*385 Good performance MMA-250T DC inverter welder