FIELD: mechanical engineering; welding. SUBSTANCE: invention relates to devices for machining, assembling and welding of girth butt joints of conical envelopes without re-placing. Device mandrel consists of movable and fixed parts. Movable part is installed for axial displacement under action of conical mandrel and for fixing in working positions. Support ring for machining of butt edges and backing ring for assembling and welding of envelopes are installed between parts of conical mandrel for being set in operating positions in turn. EFFECT: improved quality of welding without changing location of connected envelopes. 2 cl, 3 dwg
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