改良9Cr-1Mo鋼補修溶接部寿命評価法の開発

抄録

A method to estimate time to creep rupture of repaired welded joints was developed. In the method, repaired weld was divided into several elements. Time to rupture of the each element depended on R^mat, θ^fs and α, which were ratio for each typical materials formed in repaired weld , angle between fusion line and applied load, and ratio of the each material occupied in the cross section to evaluate. The rupture time of the whole repaired weld was calculated by using the elemental rupture time based on Norton's law. The creep rupture time of almost cross-weld test pieces from repaired weld could be estimated by the developed method. Further, the estimated time to rupture of large test pieces containing repaired weld showed agreement with the experimental values.