FIELD: welding. SUBSTANCE: joint has tubular member 1 and end part 2 butted with it, a lock base in the form of individual projections 3 under each rib of tubular member 1 is made on the end of part 2. The tubular member has an isosceles triangle cross section in the plane of the ends of the end part 2 of height h = (1.25-1.75)δ where d is the thickness of a polyhedron of the tubular member 1, mm, and a vertex angle equal to a matching polygonal cross section of the tubular member. EFFECT: improved quality and gas protection. 1 tbl, 2 dwg
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