METHOD OF PRODUCING ELECTRICALLY WELDED TUBES IN CONTINUOUS MILLS AND TOOL FOR PERFORMING THE METHOD Russian patent published in 1994 - IPC

FIELD: metal pressure forming. SUBSTANCE: method of making electrically welded tubes in continuous mills comprises steps of forming tube blank, welding it, simultaneous deformation of its inner burrs and forcing edges of the tube blank to welding rolls, placed at both sides relative to an axis of a welded seam; applying an effort to the blank on portions, arranged behind a zone of the metal, heated up to plastic state. Tool for making such tubes has a roller device with roller, having different curvature radius of its deforming and supporting working surfaces. A relation of these values is being calculated according to an expression, given in a description of the invention. EFFECT: enhanced quality of tubes due to stabilization of residual inner burrs value. 3 cl, 4 dwg