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Additional heating of a thickened portion of the steam generator connector during postrepair thermal treatment of the header-connector weldment leads to a decrease in residual tensile stress levels. It is shown that during hydrostatic tests performed after thermal treatment inelastic strains on the inner connector surface are reduced, which inhances the cycle life of the weldment.
Results of estimation of the stress-strain state appearing in the header-steam generator connector weldment after thermal treatment used for the reduction of residual welding stresses are presented. Such treatment, including heating, holding, and cooling of a local connector area with the weld joint, is shown to give rise to rather high additional residual stresses in the weldment.
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