| 摘要 |
PROBLEM TO BE SOLVED: To provide a welded joint having high fatigue strength properties, which is formed by a simple welding method utilizing a low thermal expansion welding material. SOLUTION: The weld bead of the welded joint having excellent fatigue properties obtained by welding steel in which the average thermal expansion coefficient at 30 to 400°C is 11×10<SP>-6</SP>to 20×10<SP>-6</SP>/°C is formed of a low thermal expansion weld metal in which the average thermal expansion coefficient at 30 to 400°C is 2×10<SP>-6</SP>to 10×10<SP>-6</SP>/°C. The weld bead of the welded joint is preferably formed of a low thermal expansion weld metal having a composition containing, by mass,≤0.20% C, 0.05 to 0.3% Si, 0.3 to 1.5% Mn,≤0.01% P,≤0.01% S, 0.005 to 0.1% Al, 20.0 to 30.0% Ni, 4.0 to 16.% Co and≤0.0300% O, and the balance Fe with inevitable impurities. COPYRIGHT: (C)2006,JPO&NCIPI |
