National University of Science and Technology “MISiS” (Moscow, Russia):

Alyushin Yu. A., Dr. Eng., Prof., alyushin7@gmail.com
Samusev S. V., Dr. Eng., Prof., samusev@misis.ru
Zhigulev G. P., Cand. Eng., Ass. Prof., zhigulev@misis.ru

Production of longitudinal-welded steel tubes for pipelines on modern high-performance tube welding lines includes bending of billet edges, step-by-step forming of the central section, sizing at mills to the preset ovality and tube expanding with its consequent forming of the finished tube profile. Three mathematical models describing the motion of particles in the Lagrange form are suggested for description of heterogeneous strained state at each of the sections; such state provides the required residual curvature. Taking into account the principle of superposition of movements, the proposed models allow to analyze any local and integral characteristics of the processes at each section for forming of welded pipes, including residual curvature and energy-power parameters. The comparison of calculated and experimental regulations of the the external strip surface has been conducted, as well as the forces at different sections of the tube electric welded line TESA-1420 for manufacture of tubes with 1420 mm diameter. The experiments have been done on the strip billets of K60 steel with preset values of elasticity model, yield strength, plastic strengthening module. The strip sizes were 4357x12015x32 mm with bending section length 495 mm.

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