METHOD FOR DEFORMING END PORTION OF WELDED TUBE Russian patent published in 1998 - IPC

FIELD: machine engineering, namely plastic metal working, particularly production of members of hydraulic-gaseous systems. SUBSTANCE: method comprises steps of thinning wall of tube in zone of welded seam, expanding end portion of tube and thinning tube wall in zone of welded seam along the whole deformed portion with deepening it. Expansion is performed by rolling out tube at simultaneously thinning its wall. Tube wall in zone of welded seam is deepened until thickness of ready product wall. Tube wall deepening is realized at sides of outer and inner surfaces of tube by working at chipping. At rolling out process tube wall is thinned only in non-deepened portions. EFFECT: enhanced possibility of deforming tube, production of uniform thickness parts. 5 cl, 4 dwg