Abstract

Electron beam (EB) welding was applied to 316SS and the titanium modified 316SS (JPCA). For the prospective improvement of swelling in welded joints, modified TIG or EB welding procedures utilizing titanium or nickel foil insertion were employed. For the case of EB welding of 15 mm thickness I-butt joint, the higher weld heat input showed better swelling resistance in the joints. The in-reactor creep results suggest that irradiation creep in welded joints may not be a big concern, as far as swelling resistance is maintained. So, Ni addition, stress relief treatment and high heat input for EB welding with optimization of welding condition are recommended for suppressing irradiation creep and swelling.

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