Transactions of the Korean Society of Pressure Vessels and Piping (한국압력기기공학회 논문집)
- Volume 5 Issue 1
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- Pages.14-19
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- 2009
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- 1738-8333(pISSN)
Evaluation Technology for the Flaw Sizing of Generator Rotor by Using Phased Array Ultrasonic Technique
위상배열 초음파기법을 이용한 발전기 로터 결점크기 평가
- Published : 2009.03.01
Abstract
NDE(Nondestructive examination) detects a flaw or discontinuity in materials. Flaws detected by the examination shall be evaluated for the decision basis of the integrity. The internal flaws of forging products can be detected by UT. However, UT has detection limits because of its reflected signal weakness. Normally, a 1mm or less flaw is known as the limit. If a flaw was detected, the size of flaw would be evaluated by AVG(or DGS) technique. To verify the evaluation data, alternative examination methods are needed. But there is no alternative examination methods until now. In this study, Phased array ultrasonic technique can be used to size the flaws in the generator rotor with focused beam of ultrasonic wave as a supplement method of AVG. Also, the phased array ultrasonic technique described enables the shape of flaw to be depicted exactly.
Keywords
- Nondestructive Examination;
- Phased Array Ultrasonic Technique;
- Flaw;
- AVG(Abstand, Verstarkung, $Gro{\beta}e$);
- DGS(Distance, Gain, Size)
- 비파괴검사;
- 위상배열 초음파 기법;
- 결점;