Weld residual stresses in nuclear power plants can lead to cracking concerns caused by stress corrosion. Many factors can lead to the development of the weld residual stresses, and the distributions of the stress through the wall thickness can vary markedly depending on the weld processing parameters, nozzle and pipe geometries, among other factors. Hence, understanding the residual stress distribution is important in order to evaluate the reliability of pipe and nozzle welded joints. This paper represents an examination of the weld residual stress distributions which occur in different nozzles. The geometries considered here are large diameter thick wall pipe and nozzles. The detailed weld residual stress predictions for these nozzles are summarized. These results are categorized and organized in this paper and general trends for the causes of the distributions are established. The solutions are obtained using several different constitutive models including kinematic hardening, isotropic hardening, and mixed hardening model. Necessary fabrication procedures such as weld repair, overlay, and postweld heat treatment are also considered. The residual stress field can therefore be used to perform a crack growth and instability analysis. Some general discussions and comments are given in the paper.
Weld Residual Stress in Various Large Diameter Nuclear Nozzles
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 18, 2011; final manuscript received April 28, 2012; published online November 21, 2012. Assoc. Editor: Xian-Kui Zhu.
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Zhang, T., Brust, F. W., and Wilkowski, G. (November 21, 2012). "Weld Residual Stress in Various Large Diameter Nuclear Nozzles." ASME. J. Pressure Vessel Technol. December 2012; 134(6): 061214. https://doi.org/10.1115/1.4007036
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