Abstract: An apparatus for overhead submerged arc welding has a hopper containing flux being pivotally mounted on a suspension for rotation about the suspension axis, the hopper having a bowl provided in the top part thereof, a welding head with a nozzle for supplying a consumable electrode, and means for supplying flux and pressing it against work.The apparatus also has a forming means mounted for swinging in its longitudinal and transverse planes and for a vertical adjustment with respect to the work being welded. The forming means is in the form of a U-shaped body having its open top part facing towards the work being welded and legs having on the side of the nozzle a pair of diverging wedge-shaped projections, an adjusting bar being provided inside the body to extend length-wise of the joint being welded. Copying members in the form of four wheels are provided outside the body on either side of the legs thereof.

Abstract: A method of brazing of an outer carbon steel shell to an inner stainless steel shell, in which a stainless steel sheet material of the inner shell is rolled up with an overlap and arranged with a clearance inside the outer shell, braze material is placed in the clearance, walls of the rolled sheet material of the inner shell are forced to the inner surface of the outer shell, longitudinal edges of the sheet material of the inner shell are weld-joined to form the inner shell, air is evacuated from the clearance, and ends of the outer and inner shells are joined by circular vacuum-tight corner welds, one leg of which extends radially and has a length equal to at least one thickness of the inner shell, whereas the length of the other leg, which extends longitudinally, is equal to at least twice the thickness of the wall of the inner shell and said inner and outer shells are brazed in a furnace forming after cooling a bimetallic cylindrical article.