FIELD: process engineering.
SUBSTANCE: invention relates to production of large-diameter welded tubes. Billet lengthwise edges are trimmed step-by-step on both sides at a time. Profile main section is formed at stepwise forming press. Billet is assembled to weld its edges by construction joint at frame-clamping mill stand. Note here that stepwise trimming of lengthwise edges proceeds unless obtained are sections with contact radius of curvature and edge sections with variable radius of curvature are obtained. In forming main section at stepwise forming press, edge sections are formed. Note also that assembling-welding mill stand gage is adjusted.
EFFECT: higher quality.
3 dwg, 3 tbl
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