Post-weld heat treatment(PWHT)can effectively reduce residual stress in welded joint.The residual stress field before and after PWHT for 150 mm thick vessel steel butt-welded joint was simulated by using finite element analysis.The evolution of residual stress during PWHT was systematically analyzed,and a comparative analysis was conducted on the residual stress relief effect of relevant PWHT process parameters.The results indicate that the PWHT significantly reduces the peak values of longitudinal and transverse residual stresses,but the impact on the distribution pattern of residual stress is relatively small.Stress relief primarily occurs during the heating stage of the treatment,with minimal relief or even rebound during the soaking and cooling stages.The analysis of process parameters reveals a nonlinear evolution of stress relief with changes in soaking time and heating temperature.Therefore,practical PWHT should consider the combined effects of influencing factors to optimize stress relief effectiveness and cost.
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