METHOD OF JOINTING PIPES TOGETHER Russian patent published in 2010 - IPC B22D19/04 F16L13/00 

FIELD: process engineering.

SUBSTANCE: invention can be used, for example in construction of main pipelines. Pipe end faces are butt-jointed and welded together by circular seam. Casting mould is arranged on said joint to heat it and casting mould for reinforcing coupling to be cast therein. Cast coupling cooled down, casting mould is removed. End faces of said cast coupling are welded by circular seams to surfaces of jointed pipes with their walls penetration within 0.2…0.5 δ, where δ is pipe wall thickness. Prior to arranging casing mould on joint surface, a spatial reinforcing metal carcass can be arranged thereon made from more refractory metal as compared with that cast in mould. To cast said coupling, metal molten in furnace or produced by exothermic mix combustion.

EFFECT: higher strength and reliability of pipes joint.

2 cl, 3 dwg