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Report No.

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

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

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.



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