Research on repair weldability of petroleum pressure vessel - Report 2: Evaluation of mechanical properties of repair weld and proposal of repair welding guideline.

摘要

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 100 mm thickness. In this paper, we confirmed mechanical properties of repair weld which temper embrittlement susceptibility was different by using 2.25 Cr-1 Mo 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.