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RESEARCH PAPERS

Eddy Current Examination of Fatigue Cracks in Inconel Welds

[+] Author and Article Information
Weiying Cheng

NDE Centre,  Japan Power Engineering and Inspection Corporation, Benten-cho 14-1, Tsurumi-ku, Yokohama, Kanagawa 230-0044, Japancheng-weiying@japeic.or.jp

Ichiro Komura, Mitsuharu Shiwa, Shigeru Kanemoto

NDE Centre,  Japan Power Engineering and Inspection Corporation, Benten-cho 14-1, Tsurumi-ku, Yokohama, Kanagawa 230-0044, Japan

J. Pressure Vessel Technol 129(1), 169-174 (Jul 11, 2006) (6 pages) doi:10.1115/1.2435718 History: Received April 26, 2005; Revised July 11, 2006

Basic studies on the eddy current examination of defects in Inconel, a typical nickel-base alloy used in the reactor vessel, pressurizer, and core internal of nuclear power plants, are carried out. The detecting and sizing capability of the eddy current method is investigated through analytical and experimental approaches. Probe’s detectability is numerically evaluated, and appropriate probe and examination conditions are correspondingly selected. The numerical signal calculation and crack reconstruction approach is confirmed in terms of the study of the eddy current examination of electrodischarge machining notches in Inconel base metal, and further applied to eddy current examination of fatigue cracks in Inconel welds. The profiles of fatigue cracks are reconstructed using eddy current testing signals. Crack depths estimated by eddy current reconstruction agree well with that of ultrasonic testing and are consistent with the crack depths revealed from destructive testing. The research presented in this paper shows that by choosing a proper testing situation, eddy current examination is feasible for detecting and sizing of surface-breaking cracks in Inconel welds.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Distribution of eddy current (imaginary part) on the surface of a flaw-free specimen: (a) surface distribution of eddy current (imaginary part), induced by probe Z, 100kHz, and (b) surface distribution of eddy current (imaginary part) induced by probe B, 25kHz

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Figure 2

Distribution of eddy current (real part) along the depth direction in a flaw-free specimen: (a) Penetration of eddy current (real part), induced by probe Z, 100kHz, and (b) penetration of eddy current (real part), induced by probe B, 25kHz

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Figure 3

Depth sizing ability of probe Z (100kHz), estimated using simulation signals

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Figure 4

Probe B response to EDM notches in Inconel 600 specimen at 25kHz, the notches are 2mm, 5mm, 7mm, 10mm, and 13mm in depth, respectively

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Figure 5

Probe Z response to EDM notches in Inconel 600 specimen at 100kHz, the notches are 2mm, 5mm, 7mm, 10mm, and 13mm in depth, respectively

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Figure 6

Depth sizing ability of probe Z (100kHz) and probe B (25kHz) in Inconel 600 specimen, estimated using measurement signals

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Figure 7

Comparison of probe Z responses (measurement versus simulation) to an EDM notch at 100kHz in Inconel 600 specimen

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Figure 8

Configuration of Inconel weld specimen

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Figure 9

Microstructure of Inconel welds on top surface

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Figure 10

Comparison of signals free of and with edge effect

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Figure 11

C-scan measurement signal of an close to edge EDM notch, before and after filtering (Imaginary part, probe Z, 100kHz)

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Figure 12

Reconstruction of a close to edge EDM notch using filtered measurement signal

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Figure 13

Reconstruction of close to edge fatigue cracks in Inconel welds: (a) using filtered 100kHz signals and (b) and (c) using filtered 50kHz signals

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Figure 14

Depth sizing of fatigue cracks using TOFD

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Figure 15

Destructive testing of fatigue cracks, cross sections with maximum crack depths are presented

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