FIELD: building, namely construction of pipelines. SUBSTANCE: method comprises steps of placing sleeve in zone of welded joint of joined pipelines; arranging on outer surface of said sleeve sealing rings; placing in mean portion of sleeve in its annular turning backing strip made of refractory material and arranging casing over it; covering inner joined surfaces of tubes with layer of sealing composition; introducing sleeve by half of its length into one of tubes; fixing sleeve by means of spot welding of said casing to tube; pushing second tube onto sleeve and joining tubes by welding. When sleeve is introduced to end portions of welded tubes, near ends of sleeve end beads of sealing composition are formed for providing additional sealing of joined surfaces of sleeve and tubes. EFFECT: simplified process for joining pipelines, enhanced reliability of joint. 1 dwg
