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Nozzle to safe-end joint in Reactor Pressure Vessel (RPV) belongs to Ferrite -Austenite type dissimilar metal weld. It is difficult to perform UT examination because of its coarse grains. Consider of deficient detectability of sub-surface planar defects by angle longitudinal wave technique, a straight longitudinal wave technique which takes safe-end as scanning surface is put forward based on joint...
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