Effect of Repair Length on Residual Stresses in a Multi-pass Butt-welded 12Cr1MoV/P91 Dissimilar Pipe

摘要

In this study, experimental and the finite element (FE) methods are utilized to investigate residual stresses of a multi-pass butt-welded 12CrlMoV/P91 dissimilar pipe.X-ray technique is used to validate the FF results.Both methods show that residual stresses are significantly unsymmetrical distributed with respect to weld center line (WCL), and peak stresses exist on the inner surface of P9 1 part.The simulated results are especially in good greement with experimental ones within the weldment and its vicinity.Results for repair welds covering different circumferential angular are also presented to investigate the influence of repair length on residual stresses.It shows the shorter repair develops higher residual stresses, and this effect is more significant within the repairing area than the other regions.