Submerged automatic welding is fulfilled by mechanization of basic movements which are operated by welder at manual welding – feeding of electrode wire in arc zone and its movement along welding edges. Wire is fed to welding zone due to feeding rollers. Current supply to the wire is provided by gliding contact. Dense layer of the flux (which is poured out during the moving of welding automat) provides effective protection of melting welding pool from reaction with air. The arc burns in gas bubble which is formed of steams and gases of flux and melted metal. As a result of metallurgical interaction of slag and melted metal and also crystallization of pool’s metal the joint is formed with required chemical structure and mechanical properties. There is easy-removing slag crust from flux situated on the surface of joint. Not expended flux is collected in flux-collector for further using in welding.