FIELD: metallurgy.
SUBSTANCE: pipe billets are produced by winding sandwiched sheet-strips from steels 08X18H10T and "17ГСУ" on revolving drum-reel and subsequent transverse butt welding of pipe billets. Note here the sheet edges are milled at 45 degrees and butt-jointed by submerged arc welding to rated depth of sheet wall depth. Welds at outer surface of sandwiched pipes are shifted relative to welds on inner surface through specified value. Note here that depth of said sheets-strips are selected subject to operating conditions of bimetallic pipes.
EFFECT: lower metal input, higher environmental safety.
2 cl
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