Cracks by SCC (stress corrosion cracking) and high cycle fatigue were detected at the welded joints of nickel based alloy of reactor vessel, pressurizer and core internal of nuclear power plants in recent years. To ensure the integrity of plants, it is necessary to improve NDT (non-destructive testing) techniques for reliable detection and evaluation of defects in the nickel-base alloy. Basic studies on the flaw detection and characterization by eddy current examination of inconel, a typical nickel-base alloy, are carried out. Specimens made of inconel and inconel weld metal are prepared, fabricated with EDM (Electro-Discharge Machining) notches and fatigue cracks. The detecting and sizing capability of eddy current method is investigated through analytical and experimental approaches. Numerical analysis helps in choosing an appropriate probe and examination condition, and evaluating a crack from the measured signals. All or part of a planar crack is reconstructed using an inversion approach. The result from ECT (eddy current testing) is compared with that of UT (ultrasonic testing). The research presented in this paper shows that by choosing a proper testing situation, eddy current examination is feasible for the detection and sizing of surface-breaking cracks in inconel welds.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4679-2
PROCEEDINGS PAPER
Analytical and Experimental Approaches for the Sizing of Fatigue Cracks in Inconel Welds by Eddy Current Examination Available to Purchase
Weiying Cheng,
Weiying Cheng
Japan Power Engineering and Inspection Corporation, Yokohama, Kanagawa, Japan
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Ichirou Komura,
Ichirou Komura
Japan Power Engineering and Inspection Corporation, Yokohama, Kanagawa, Japan
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Mitsuharu Shiwa
Mitsuharu Shiwa
Japan Power Engineering and Inspection Corporation, Yokohama, Kanagawa, Japan
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Weiying Cheng
Japan Power Engineering and Inspection Corporation, Yokohama, Kanagawa, Japan
Ichirou Komura
Japan Power Engineering and Inspection Corporation, Yokohama, Kanagawa, Japan
Mitsuharu Shiwa
Japan Power Engineering and Inspection Corporation, Yokohama, Kanagawa, Japan
Paper No:
PVP2004-2836, pp. 191-197; 7 pages
Published Online:
August 12, 2008
Citation
Cheng, W, Komura, I, & Shiwa, M. "Analytical and Experimental Approaches for the Sizing of Fatigue Cracks in Inconel Welds by Eddy Current Examination." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Recent Advances in Nondestructive Evaluation Techniques for Material Science and Industries. San Diego, California, USA. July 25–29, 2004. pp. 191-197. ASME. https://doi.org/10.1115/PVP2004-2836
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