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초음파를 이용한 Austenitic Stainless Steel 용접부의 결함검출에 관한 기초적 연구
윤광식,박광희,박문호,서동만 韓國非破壞檢査學會 1989 한국비파괴검사학회지 Vol.9 No.1
This paper presents the ultrasonic characteristics of weldment and detectability of defects of weldment in Austenitic Stainless Steel Type 304 that is composed of mostly coolant piping system in nuclear power plants. The results of this experient shows as follows : 1. When the ultrasonic beam detects the detects on the side of base metal and on the opposite side of weldment, the indications which was detected on the screen show different amplitude and different metal path each. 2. The ultrasonically estimated notch depth is generally oversized than actual notch depth. 3. It is easy for the false indication to show up on the screen because of columnar structure of weldment in austenitic stainless steel. 4. The higher frequencies of transducer have more difficulties to detect the defects of the opposite side of weldment because of ultrasonic attenuation in weldment and the longitudinal transmitter-receiver transducer in the most effective in detecting the opposite side defects of weldment.
尹光植,許炯,朴大英 韓國非破壞檢査學會 1987 한국비파괴검사학회지 Vol.6 No.2
For the purpose of domestic production of ultrasonic transducer, experiments on material selection for backing and matching layer, and electrical impedance matching between transducer and equipment were performed. The characteristics of manufactured transducers with experimental results were analyzed and compared with foreign products. Through the evaluation of the transducers manufactured and the comparision with foreign products, it is confirmed that the transducers manufactured show the good performance characteristics and efficiency.
핀-핑거형 터빈 동익 루트의 초음파탐상에서의 기하신호 해석
정현규,주영상,윤광식,최명선,임형택 韓國非破壞檢査學會 1994 한국비파괴검사학회지 Vol.14 No.3
핀-핑거형 터빈 동익 루트의 사각 초음파탐상에서의 기하신호가 해석된다. 동익루트의 기하가 설명되고, 기하신호가 형성되기 위한 반사조건들이 제시된다. 그리고, 이 기하신호의 빔경로에 관한 일반식들이 유도되고 검증된다. 이 기하신호는 리가먼트 모서리 신호이며, 그 위치와 진폭은 핀홀과 리가먼트의 크기 및 탐촉자의 빔지향 특성으로부터 결정될 수 있다는 것이 보여진다. Interpreted is the geometric signal in the angle beam ultrasonic testing for the pin-finger type of turbine blade roots. The geometry of the blade roots is described and the reflection conditions for appearance of the geometric signal are proposed. The general equation for its beam path is derived and verified. As the results, it is found that the geometric signal is the back reflection from the ligament edge, and its position and amplitude can be determined from the dimension of blade root and the beam directivity of transducer.