A study on detection of micro-cracks in the dissimilar metal weld through ultrasound infrared thermography |
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| Institution: | 1. Safety Measurement Center, Korea research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 305-340, Republic of Korea;2. Department of Mechanical & Automotive Engineering, Kongju National University, 1223-24 Cheonan-daero, Subuk-gu, Cheonan, Chungnam 330-717, Republic of Korea;1. Sorbonne Universités, UPMC Univ Paris 06, F-75005 Paris, France;2. CNRS, UMR 7587, F-75005, Paris, France;3. Institut Langevin, PSL Research University, ESPCI ParisTech, 1 rue Jussieu, F-75005, Paris, France;4. LPEM, PSL Research University, ESPCI-ParisTech, 10 rue Vauquelin, F-75005 Paris, France;5. CNRS, UMR 8213, F-75005 Paris, France;1. College of Light Industry, Harbin University of Commerce, Harbin 150028, PR China;2. School of Mechanical Engineering, Heilongjiang University of Science and Technology, Harbin 150022, PR China;1. Department of Engineering, Polo Scientifico Didattico di Terni, University of Perugia, Strada di Pentima 4, 05100, Terni, Italy;2. Department of Industrial and Information Engineering and Economics, University of L''Aquila, Piazzale E. Pontieri 1, 67100, Loc. Monteluco di Roio, L''Aquila, AQ, Italy;3. School of Engineering, University of Warwick, Library Road, CV4 7AL, Coventry, United Kingdom;4. Department of Electrical and Computer Engineering, Laval University, 1065, av. de la Médecine, G1V 0A6, Québec City, QC, Canada;5. Department of Informatics, Modeling, Electronics and Systems Engineering, University of Calabria, Via Pietro Bucci, 87036, Arcavacata, Rende CS, Italy |
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| Abstract: | This study was conducted to investigate a possibility of detecting stress corrosion crack defects in a pipe welded with dissimilar metals (STS304 and SA106 Gr. b) through infrared ultrasound thermography and lock-in phase method. The ultrasound generator was set as 250 W in output and 19.8 kHz in frequency. With experiment results, this study could detect, cracks located inside the dissimilar metal weld pipe through lock-in infrared thermography and compare thermography images obtained from both the inside and the outside when the ultrasound vibration was applied to the outer part of the pipe. Besides, after cutting off the pipe in the axial direction, this study conducted PT inspection. As a result, it was found there existed more than a single crack in a certain range inside the pipe, which made hot spots appear in a wide range on the thermography image. Moreover, through ultrasound infrared thermography and lock-in phase method this study verified the possibility of detecting micro-sized shattered cracks through ultrasound thermography, which were not easy to detect with the existing techniques. |
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| Keywords: | Infrared thermography Ultrasound Lock-in phase Dissimilar metal weld Stress corrosion cracking |
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