Material welding is essential for the development, operation, maintenance, and upgrade of nuclear reactors. Alloy 800H has long been used as a structural material for high-temperature, highly oxidizing and corrosive environments. Its desirable mechanical and corrosion properties along with a satisfactory service history, have led to its selection as a candidate alloy for high-temperature gas-cooled reactors. This paper presents the corrosion test results of Alloy 800H and its weldments using three filler materials, Haynes 230, Inconel 82, and SS316L tested in both pure and impure helium gas atmospheres at 760°C. The results show that the mass change rate of weldments depends on the filler materials; however, the mass change rates of Alloy 800H weldments are lower than that of the base metal Alloy 800H in helium atmosphere. Therefore, enhanced corrosion in the welded area is not a concern under the test conditions.
Qiu et al. (Mon,) studied this question.