| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for working a welded joint comprising a weld metal having satisfactory low temperature toughness, after the performance of welding applied in the case an actual welded structure is produced, by forming a welded joint as well, thus suppressing the strain age hardening of a weld metal generated in a welded joint to be subjected to heat treatment, and reducing deterioration in its toughness caused thereby. SOLUTION: In the method for working a welded joint comprising a weld metal having satisfactory low temperature toughness, a weld metal having a composition comprising, by mass, 0.03 to 0.09% C, 0.08 to 0.4% Si, 1.0 to 2.3% Mn, 0.005 to 3.3% Ni, 0.005 to 1.5% Cr and 0.005 to 2% Mo, and in which Pcw value defined by formula (1) satisfies 0.2 to 0.8, and the balance Fe with inevitable components is formed on the weld zone in a welded joint, the welded joint is subjected to heating treatment under the conditions satisfying a heating temperature of 50 to 450°C and a holding time of≥1 s, and thereafter, the welded joint is formed, and is heat-treated. COPYRIGHT: (C)2006,JPO&NCIPI |
