Comparison of Absolute and Differential ECT Signal Characteristics Obtained at Tubesheet and Tube Expansion Area

Steam generator tubes are expanded inside tubesheet holes and the crevice gap between tubesheet and the tube should be minimized. To examine tube expansion area, eddy current testing is usually used. In this paper, absolute and differential signals are computed by a numerical method for several diff...

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Bibliographic Details
Published in:Key engineering materials 2006-01, Vol.321-323, p.414-419
Main Authors: Song, Sung Chul, Shin, Young Kil, Jung, Hee Sung, Im, Chang Jae, Song, Myung Ho
Format: Article
Language:English
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Summary:Steam generator tubes are expanded inside tubesheet holes and the crevice gap between tubesheet and the tube should be minimized. To examine tube expansion area, eddy current testing is usually used. In this paper, absolute and differential signals are computed by a numerical method for several different locations of transition region and signal variations due to tubesheet, tube expansion and operating frequencies are observed. Results show that low frequency is good for identifying the location of tubesheet, and high frequency is good for the measurement of expanded tube diameter and the recognition of transition region. In general, absolute signal is good for measuring tube diameter and the differential signal has advantages of locating tubesheet and both ends of the transition region.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.321-323.414