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박익근,김용권,김현묵,송원준,조용상,안연식,Park, Ik-Keun,Kim, Yong-Kwon,Kim, Hyun-Mook,Song, Won-Joon,Cho, Yong-Sang,Ahn, Yeon-Shik 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.5
Conventional non-destructive techniques for inspection of the weld in pipelines require significant test time and high cost. Ultrasonic guided waves have been widely studied and successfully applied to various non-destructive tests with advantage of the long-range inspection. In this paper, a study on the application of ultrasonic guided waves to the long-range inspection of the pipeline is presented using a long-range guided wave inspection system, Wavemaker SE16, GUL. The characteristics and setup of the long-range guided wave inspection system and experimental results in pipes of with various diameter are introduced. The experimental results in mock-up pipes with cluster type detects show that the minimum detectable wall thickness reduction with this guided wave system is $2\~3\%$ in the pipe cross section area. And the wall thickness reduction of $5\%$ in cross section area can be detected when actual detection level is used. Therefore, the applicability of the guided wave systeme to long-range inspection of wall thickness reduction in pipes is verified.
초음파현미경에서 V(z) 곡선을 이용한 세라믹/금속 접합계면의 비파괴평가
박익근,이철구,조동수,김용권,Park Ik-Keun,Lee Chul-Ku,Cho Dong-Su,Kim Yong-Kwon 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.2
A leaky surface acoustic wave (LSAW) velocity was measured using a scanning acoustic microscope on the ceramic/metal interface in order to investigate material properties. The inverse Fourier transform (IFFT) of the V(z) curve contains the reflectance function of a liquid-specimen interface. So, the longitudinal, transverse, and Rayleigh wave velocities for each layer are obtained by the inversion of the V(z) curve at the same time. This paper contains mainly the experimental procedure for measurements of the LSAW velocity, and the results obtained for the velocity variation of individual layer after the thermal shock. It is shown that this method is useful in measuring the material properties under external stress.
박익근,이철구,김현묵,박태성,김용권,조용상,송원준,안형근,Park, Ik-Keun,Lee, Chul-Ku,Kim, Hyun-Mook,Park, Tae-Sung,Kim, Yong-Kwon,Cho, Yong-Sang,Song, Won-Joon,Ahn, Houng-Kun 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.5
The non-destructive Inspection of the fillet weldment has difficulties due to its geometrical complexity and uneasy access. The surface shear horizontal wave (SH-wave), however, has been successfully applied to the detection of cracks on the surface and sub-surface of the filet weldment heel part. The conventional ultrasonic inspection using the surface SH-wave is usually a contact method using piezoelectric transducer. Thus, it is not suitable for a field application because the reliability and repeatability of inspection are significantly affected by test conditions such as couplant, contact pressure and pre-process. In order to overcome this problem, a non-contact SH-wave inspection method using EMAT is propose. The experimental results with this non-contact method are compared with those with a conventional ultrasonic method in fillet weldment with slit type defects. It is shown that the non-contact inspection technique requires simple procedure and less time in the fillet weldment inspection.
국내 산업설비(발전 · 가스)에서 위상배열초음파검사(PAUT)의 확대 적용을 위한 실증기술 개발 현황
박익근(Ik Keun Park),조성종(Sungjong Cho),김영래(Young Lae Kim),최유민(Yu Min Choi) 한국비파괴검사학회 2021 한국비파괴검사학회 춘계학술대회 초록집 Vol.2021 No.6
발전설비나 가스시설과 같은 대형 산업설비는 안전사고 발생 시 막대한 경제적·사회적 손실이 야기될 수 있어 설비에 대한 비파괴검사(NDT)를 통한 건전성 확보는 필수적이다. 비파괴검사 기법 중 RT 대체 위상배열초음파탐상검사(Phased Array Ultrasonic Testing; PAUT) 기법은 전자적으로 빔 조향과 집속이 가능하고 실시간으로 시험편 내부의 영상을 확인할 수 있다는 장점을 가지고 있어 산업설비 분야에서 적용이 확대되고 있다. 현재까지 지역난방설비와 화력발전설비의 PAUT 기법 적용을 위해 다자비교시험(Round Robin Test) 및 신뢰도 분석을 통한 PAUT 표준검사절차서를 개발하는 실증연구를 수행하였으며, 현재 화력발전설비의 경우 한국전기설비규정(KEC) 개정을 진행 중이다. 가스설비분야에서도 LNG 저장탱크에 한정하여 PAUT 기법을 적용하기 위한 실증연구를 추진하고 향후 가스기술기준(KGS Code)을 개정하여 실제 현장에 PAUT 기법의 확대 적용이 예상된다. 아직까지 PAUT 기법은 화력발전설비 및 가스설비에 대해 부분적으로 적용되고 있지만 실증연구를 토대로 PAUT 기법의 신뢰도를 확보하고 표준화를 통해 적용범위를 확대해 나가야 한다. 이를 위해서는 4차 산업혁명 융합 첨단 과학 기술에 대응하여 데이터과학 기반 PAUT 적용 기술의 확대에 주목하고, 이를 위해 요구되는 다자비교시험/평가(Round Robin Test/Evaluation; RRT/RRE) 방법론 개발, META-Model 기반 NDT 신뢰도 평가 기법 개발 등을 통한 최적의 기량검증(Performance Demonstration; PD) 시스템의 도입과 운영 방안에 대한 연구 개발 현황에 대해 소개하고자 한다. Since a safety accident at large industrial facilities, such as power plants and gas facilities, may cause enormous economic and social losses, it is essential to ensure the reliability of such facilities through Non-destructive Testing (NDT). A Phased Array Ultrasonic Testing (PAUT) technique in lieu of Radiographic Testing (RT) has the advantage of being able to electronically steering and focusing the ultrasonic beam and inspecting the image inside the specimen in real time. Thus the application is expanding in the field of industrial facilities. In order to apply the PAUT technique to thermal power plants, demonstration study has been conducted to develop a PAUT standard inspection procedure through round robin tests (RRT) and reliability analysis, and the Korea Electrical Code (KEC) will be revised. In addition, in the gas facility field, demonstration study is in progress for a limited application of the PAUT technique to LNG storage tanks. This will allow the Korea Gas Safety Code (KGS Code) to be revised and apply the PAUT technique to the field. Although the PAUT technique is still partially applied to thermal power plants and gas facilities, the reliability of the technique should be improved based on the above demonstration study, and the scope of application should be expanded through standardization. Corresponding to the 4th industrial revolution fusion advanced science and technology, it should be expanded the PAUT application technology based on data-science. In this study, we would like to introduce the status of research and development for the introduction of the Performance Demonstration (PD) system through the development of the Round Robin Test/Evaluation (RRT/RRE) methodology and the META-Model based NDT reliability evaluation method.