DEVICE FOR IMPROVING RESIDUAL STRESS IN WELDED PIPE JOINT PART

摘要

PROBLEM TO BE SOLVED: To provide a device for improving residual stresses in a welded pipe joint part which is easily installed and capable of ensuring the predetermined quality.;SOLUTION: The residual stress improving device capable of improving residual stresses in a welded pipe joint part Y by heating an outer surface side of the welded joint part Y of a pipe P to generate the temperature difference between the outer surface side and the inner surface side comprises a holding means 2 to hold a portion in a vicinity of the welded joint part Y of the pipe P, a rotating body 3 which is provided in a relatively rotatable manner in the circumferential direction around the pipe P to the holding means 2, and provided with a storage space 7 to store the pipe P, a heating means 5 which is provided on the rotating body 3, facing the welded joint part Y of the pipe P stored in the storage space 7, and a control device 12 to control the rotation of the rotating body 3 with respect to the holding means 2 and the heating on the outer surface of the welded joint part Y of the pipe P by the heating means 5.;COPYRIGHT: (C)2005,JPO&NCIPI