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Welding residual stress profiles of low alloy steel JIS SQV2A could be predicted by thermal elastic plastic analysis taking account of the phase transformation strain. Residual stress relaxation during post-weld heat treatment (PWHT) could be also predicted by creep analysis. Effects of welding and PWHT conditions were examined, such as heat input efficiency, preheating temperature and PWHT holding temperature and time on residual stress profiles. The effects of heat input efficiency and preheating temperature in welding conditions were found to be remarkable on the stress distribution for the thermal elastic plastic analysis taking account of the phase transformation strain. The effect of temperature in PWHT conditions was also found to be remarkable on the stress distribution for the creep analysis. However, the effect of holding time was not found. Since the creep rate was fast for large residual stress, creep strain was suggested to saturate during rising temperature period. The accuracy of these analytical results was validated by temperature measurement during on bead welding and residual stress measurement using strain release method after welding and PWHT.

Effects of Weld and Post Weld Heat Treatment Conditions on Welding Residual Stress in Low Alloy Steel Plate