Overlay weld crack evaluation method, pipe body manufacturing method, and evaluation material

摘要

PROBLEM TO BE SOLVED: To provide a method for appropriately evaluating a weld crack of a welded portion formed on a surface of a cylindrical pipe body. SOLUTION: A welded portion is formed by a welding step (S101) of performing overlay welding for forming a welded portion spirally extending around an axis so as to cover the surface of a cylindrical heat transfer tube, and a welding step (S101). A manufacturing step (S104) of cutting the heat transfer tube and creating an evaluation material in which a welded portion is formed on the entire surface corresponding to the surface of the heat transfer tube, and bending of the evaluation material formed by the preparation step (S104). An overlay weld crack evaluation method comprising a step (S105) and an overlay weld crack evaluation step (S106) for evaluating whether or not a weld crack has occurred in the evaluation material bent by the bending step (S105). [Selection diagram] FIG. 9