摘要：The paper includes a comparative study on the efficiency of dimension-al stabilization of welded stitches in P265GH steel pipes by local-stress relief heat-treatment and low frequency mechanical vibration. Considering the fields of use, these steels must provide high tempera-ture resistance (creep) and ductility, especially elongation and crack-ing, at high, stable values during the use of the metal structure. Taking a decision on applying stress relieving treatment to a welded structure should take account of certain major factors. Also, depending on the level and distribution of the residual stresses, the volume of the weld structure and its complexity, it will be decided whether the stress will be done totally or locally. Also, one of the drawbacks of applying the method is that stress relieves the manufacturing time and cost of the welded structure. If for a thermally stressed part the duration is 24 hours or more in the case of mechanical vibration stabilization, the time shortens significantly.
