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Investigation of Eddy Current examination on OD fatigue crack for steam generator tubes

: Kong, Yuying; Ding, Boyuan; Li, Ming; Liu, Jinhong; Chen, Huaidong; Meyendorf, Norbert G.


Meyendorf, N.G. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Smart Materials and Nondestructive Evaluation for Energy Systems 2015 : 9-10 March 2015, San Diego, California
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9439)
ISBN: 978-1-62841-542-1
Paper 94390X, 7 pp.
Conference "Smart Materials and Nondestructive Evaluation for Energy Systems" <2015, San Diego/Calif.>
Conference Paper
Fraunhofer IKTS ()

The opening width of fatigue crack was very small, and conventional Bobbin probe was very difficult to detect it in steam generator tubes. Different sizes of 8 fatigue cracks were inspected using bobbin probe rotating probe. The analysis results showed that, bobbin probe was not sensitive for fatigue crack even for small through wall crack mixed with denting signal. On the other hand, the rotating probe was easily to detect all cracks. Finally, the OD phase to depth curve for fatigue crack using rotating probe was established and the results agreed very well with the true crack size.