Applicability Evaluation of Eddy Current Testing for Underwater Laser Beam Welding
小林 徳康 Noriyasu KOBAYASHI 糟谷 高志 Takashi KASUYA 上野 聡一 Souichi UENO 落合 誠 Makoto OCHIAI 湯口 康弘 Yasuhiro YUGUCHI
BWRDefect detecting capabilityEddy current testingPWRUnderwater laser beam welding
Abstract We clarified a defect detecting capability of eddy current testing (ECT) as a surface inspection technique for underwater laser beam welding. An underwater laser beam welding procedure includes groove caving as a preparation, laser beam welding in groove and welding surface grinding as a post treatment. Therefore groove and grinded welding surface inspections are required underwater. We curried out defect detection test s using three kinds of specimens simulated a groove, reactor vessel nozzle dissimilar metal welding materials and a laser beam welding material with a cross coil ECT probe. From experimental results, we confirmed tha t it is possible to detect 0.3 mm or more depth electro-discharge machining slits on machining surfaces in all specimens and an ECT has possibility as a surface inspection technique for underwater laser beam welding.