RESIDUAL STRESS IMPROVING METHOD OF PIPELINE

摘要

Provided are pipeline residual stress improving method and device, which are enabled to improve the residual stress reliably, irrespective of the disposed state and the constituted state of a pipeline, by specifying the management ranges of working conditions. When a cylindrical pipeline (2) is improved in its residual stress by irradiating the outer circumference of the welded portion (C) of the pipeline (2) locally with a laser beam (5a) and by moving an irradiated region (S) circumferentially, therefore, a plurality of thermocouples (9) are disposed at the pipeline (2) to be worked, and the temperature history of the outer face of the pipeline (2) by the irradiation of the laser beam (5a) is managed by measuring the temperature history itself.