Effect of Post-weld Heat Treatment on Residual Stress in GTAW Welds of 316LN Steel
In order to study the effect of post-weld heat treatment( PWHT) on the welding residual stress of 316 LN steel,the constraint stress test was designed and the heat treatment process was developed. Using the blind hole method determination of welding residual stress values before and after heat treatment, and the welding residual stress was analyzed.The results show that(920±10)℃×1h and(400±10)℃×(2-3)h can significantly release the residual stress of 316 LN steel, and the(920±10)℃×1h is the best process for reducing the welding stress effect.