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Materials 2019, 12(6), 867; https://doi.org/10.3390/ma12060867

Magnetostrictive Guided Wave Technique Verification for Detection and Monitoring Defects in the Pipe Weld

1
Nuclear Materials Research Division, Korea Atomic Energy Research Institute, 989-111, Daedeok-daero, Yuseong-gu, Daejeon 34057, Korea
2
Department of Materials Science and Engineering, Dankook University, Dandae-ro, Dongnam-gu, Cheonan 31116, Korea
*
Author to whom correspondence should be addressed.
Received: 11 February 2019 / Revised: 6 March 2019 / Accepted: 11 March 2019 / Published: 15 March 2019
(This article belongs to the Special Issue Non-destructive Inspection)
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Abstract

During inspection of piping in nuclear power plants or other industries, it is difficult to implement conventional nondestructive techniques due to limited accessibility or obstacles such as pipes with insulation, pipes buried underground, structural complexity, or radiation environments. In addition, since the defects mainly occur in the weld region or support area, it is not easy to separate defect signals from those of structural components. To solve these problems, we developed a technique to detect and monitor the formation and growth of defects, using a magnetostrictive guided wave sensor. This sensor has advantages (such as sharp and clear signal patterns and ability to easily eliminate the signal from the geometric structure) over the conventional piezoelectric transducer. To verify our technique, signals from actual pipe welds with defects were acquired and processed with our phase matching/subtraction program. The proposed technique shows a superior capability for detection and monitoring of defects, compared to the conventional guided wave methods. View Full-Text
Keywords: long range inspection; guided wave; magnetostrictive sensor; signal processing long range inspection; guided wave; magnetostrictive sensor; signal processing
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Oh, S.-B.; Cheong, Y.-M.; Lee, D.-H.; Kim, K.-M. Magnetostrictive Guided Wave Technique Verification for Detection and Monitoring Defects in the Pipe Weld. Materials 2019, 12, 867.

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