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Katsuyama, Jinya; Nakamura, Mitsuyuki; Tobita, Toru; Onizawa, Kunio
no journal, ,
Weld residual stress distributions have been measured for several specimens with various diameters and thicknesses of typical butt-weld joints in recirculation piping in light water reactors. Residual stress by means of welding simulation based on thermo-elastic-plastic analysis has been validated by comparing with the experimental results. Using the welding simulation method, effects of the shape of welds and the welding conditions of each welding pass on residual stress distribution have been evaluated. From the analysis results, it was confirmed that the axial residual stress was dependent on the pipe diameter, and that the magnitude of residual stress was proportional to the weld heat input. It was also clearly shown that welding condition of final welding pass has the largest influence on weld residual stress distribution.
Ihara, Ryohei*; Katsuyama, Jinya; Onizawa, Kunio; Hashimoto, Tadafumi*; Mikami, Yoshiki*; Mochizuki, Masahito*
no journal, ,
Stress corrosion cracking (SCC) has been observed near the weld zone of core shroud and recirculation pipes made of Type316L stainless steel. Residual stress distribution generated by welding and/or surface machining is very important for the evaluation of occurrence and propagation of SCC in such a non-sensitized material. In this work, residual stress distribution due to surface machining at the piping-weld has been evaluated by numerical simulations with the cutting speed varied. Analysis results showed that the thickness of hardened layer due to surface machining was limited only to a thin area of 0.2 mm, although higher cutting speed caused higher residual stress at the surface.