An Efficient Method for Estimation of Reduction of Welding Residual Stresses from Stress-Relief Annealing (Report II) : The Characteristics of Reduction of Welding Residual Stresses in Very Thick Joints during SR Treatment(Mechanics, Strength & Structural

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Stress-relief annealing (SR treatment) is included in the fabrication process of welded structures such as pressure vessels. This study aims to develop a simple analytical method which facilitates the calculation of transient and residual stresses during SR treatment, in order to easily determine reasonable conditions of SR treatment for the recent large-size structures constructed of high quality thick plates. In the first report, estimating equations in an uni-axial stress state were formulated for relaxation tests at changing and constant temperatures. In this report, the stresses relaxed by SR treatment in the thick welded joint are analyzed accurately by the finite element method based on thermal elastic-plastic-creep theory. The characteristics of the changes of the welding residual stresses in multi-axial stress state are studied in detail for further development of the estimation method.
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