METHOD FOR THE MANUFACTURE OF PIPES USING CONTINUOUS PIPE WELDING UNITS Russian patent published in 2023 - IPC B21C37/83 

FIELD: pipe manufacturing.

SUBSTANCE: invention relates to the manufacture of pipes using continuous pipe welding units. Butt-welding is done to produce a continuous strip of the ends of the strips with a width having a margin for tightening during deformation; the thickness of the strip is measured at the entrance to the bending-tensioning device and the boundary value of the thickness H_BOUND is determined, the strip is deformed by its alternating plastic bending with tensioning by non-driven rollers of the multi-roller bending machine by pulling the strip with a pulling device. The strip is formed into a tubular billet, its edges are welded, and the welded pipe is calibrated or profiled. The boundary value of the thickness of the strip H_BOUND, the value of the extrusion of sections of the stripλ₁ and λ₂ and the coefficient f defining the deformation share of the relative thickness of the strip (H_meas-H_BOUND):H_BOUND are determined.

EFFECT: improved quality of the pipe weld.

1 cl, 2 tbl