FIELD: welding. SUBSTANCE: essence of the novation lies in the gradual in transitions, turning in the billet members. First the peripheral sections with the radius equal to 0.9-1.1 of the pipe radius and the bending angle of 45-65 are bent under. Then the turning in of the sections along the curves of the fourth order of the Kassini oval type with the monotonically diminishing interfocal distance is exercised. EFFECT: enhanced quality at the expense of decreasing the nonuniformity of deformation. 3 dwg, 3 tbl
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