Integrity assessment of aged and on-site welded joints in LMFR

Wakai, Takashi; Onizawa, Takashi; Ando, Masanori; Aoto, Kazumi; Martin, L.*

Proceedings of Creep and Fracture in High Temperature Components-design and life Assessment Issues (CD-ROM), 11 Pages, 2005/09

For elongation of the plant life, damaged pipes and/or components should be replaced during the plant service period. In this case, some on-site welded joints may take place. In order to assess the structural integrity of such on-site welded joints, metallurgical examination and mechanical tests have been conducted. Comparing the microstructures of aged factory welded joints and those of newly produced on-site welded joints made of an austenitic stainless steel, the influence of heat input during the on-site welding process on the integrity of the joints are discussed.