抄録
In previous report, authors simulated actual pressure vessel repair weld exposed at high temperature and high pressure hydrogen by using large size test specimen which exceeds 100mm thickness. In this paper, we confirmed mechanical properties of repair weld which temper embrittlement susceptibility was different by using 2. 25Cr-1Mo steel test specimens of two kinds of chemical composition. And we examined the effect of the temper embrittlement on the serviceability after repair welding. Next, the possibility of PWHT omission after repair welding was verified by the measurement of the residual stress. Finally, repair welding guideline was proposed including these test results.
