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Field Application of Phased Array Ultrasonic Testing for Structural Weld Overlay on Dissimilar Welds of Pressurizer Nozzles
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가압기 노즐 이종금속 용접부의 구조적 오버레이 용접부에 대한 위상배열 초음파기법의 현장 적용

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Type
Academic journal
Author
Jin-Hoi Kim (한수원중앙연구원) Yongsik Kim (한수원중앙연구원)
Journal
The Korean Society For Nondestructive Testing JOURNAL OF THE KOREAN SOCIETY FOR NONDESTRUCTIVE TESTING Vol.35 No.4 KCI Accredited Journals
Published
2015.8
Pages
268 - 274 (7page)

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Field Application of Phased Array Ultrasonic Testing for Structural Weld Overlay on Dissimilar Welds of Pressurizer Nozzles
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Abstract· Keywords

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Weld overlay was first used in power plants in the US in the early 1980s as an interim method of repairing the welds of flawed piping joints. Weld overlaid piping joints in nuclear power plants must be examined periodically using ultrasonic examination technology. Portable phased array ultrasonic technology has recently become available. Currently, the application of preemptive weld overlays as a mitigation technique and/as a method to improve the examination surface condition for more complex configurations is becoming more common. These complex geometries may require several focused conventional transducers for adequate inspection of the overlay, the original weld, and the base material. Alternatively, Phased array ultrasonic probes can be used to generate several inspection angles simultaneously at various focal depths to provide better and faster coverage than that possible by conventional methods. Thus, this technology can increase the speed of examinations, save costs, and reduce radiation exposure. In this paper, we explain the general sequence of the inspection of weld overlay and the results of signal analysis for some PAUT (phased array ultrasonic testing) signals detected in on-site inspections.
#위상배열 초음파기법 #용접 오버레이 #가동중검사 #PAUT(Phased Array Ultrasonic Testing) #SWOL(Structural Weld Overlay) #ISI(In-Service Inspection)

Contents

초록
Abstract
1. 서론
2. 구조적 용접 오버레이 검사
3. 위상배열 초음파검사
4. 오버레이 용접부 검사 결과
5. 결론
참고문헌

References (4)

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[보고서] - KHNP / 2012 / SWOL Method for Pressurizer Nozzles google schola [보고서] - EPRI / 2007 / Nondestructive Evaluation: Procedure for Manual Phased UT of Weld Overlays google schola [기타자료] - / 2008 / Dissimilar Metal Overlay for Repair or Mitigation of Class 1, 2, and 3 Items Section Ⅺ, Division 1 / ASME Code Case N-740-1 google schola [기타자료] - PNNL / / Ultrasonic Evaluation of Two Dissimilar Metal Overlay Specimens / PNNL-21502 google schola

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