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A Brazing Defect Detection Using an Ultrasonic Infrared Imaging Inspection  

Cho, Jai-Wan (Nuclear Industry Robotics Lab., Korea Atomic Energy Research Institute)
Choi, Young-Soo (Nuclear Industry Robotics Lab., Korea Atomic Energy Research Institute)
Jung, Seung-Ho (Nuclear Industry Robotics Lab., Korea Atomic Energy Research Institute)
Jung, Hyun-Kyu (Nuclear Industry Robotics Lab., Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.27, no.5, 2007 , pp. 426-431 More about this Journal
Abstract
When a high-energy ultrasound propagates through a solid body that contains a crack or a delamination, the two faces of the defect do not ordinarily vibrate in unison, and dissipative phenomena such as friction, rubbing and clapping between the faces will convert some of the vibrational energy to heat. By combining this heating effect with infrared imaging, one can detect a subsurface defect in material in real time. In this paper a realtime detection of the brazing defect of thin Inconel plates using the UIR (ultrasonic infrared imaging) technology is described. A low frequency (23 kHz) ultrasonic transducer was used to infuse the welded Inconel plates with a short pulse of sound for 280 ms. The ultrasonic source has a maximum power of 2 kW. The surface temperature of the area under inspection is imaged by an infrared camera that is coupled to a fast frame grabber in a computer. The hot spots, which are a small area around the bound between the two faces of the Inconel plates near the defective brazing point and heated up highly, are observed. And the weak thermal signal is observed at the defect position of brazed plate also. Using the image processing technology such as background subtraction average and image enhancement using histogram equalization, the position of defective brazing regions in the thin Inconel plates can be located certainly.
Keywords
Ultrasound Excitation; Infrared Image; Welding; Non Destructive Test; Defect Detection;
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1 M. Morbidini, P. Cawley, T. J. Barden, D. P. Almondi and P. Duffour, 'A new approach for the prediction of the thermosonic signal from vibration records,' Review of Quantitative Nondestructive Evaluation, Vol. 25. pp. 558-565, (2006)
2 X. Han, L. D. Favro and R. L. Thomas, 'Recent developments in sonic IR imaging,' Review of Quantitative Nondestructive Evaluation, Vol. 22, pp. 500-504, (2003)
3 X. Han, V. Loggins, Zhi Zeng, L. D. Favro and R. L. Thomas, 'Mechanical model for the generation of acoustic chaos in sonic infrared imaging,' Appl. Phys. Lett., Vol. 85, No.8, pp. 1332-1334, (2004)   DOI   ScienceOn
4 L. D. Favro, R. L. Thomas, X. Han, Z. Ouyang, G. Newaz and D. Gentile, 'Sonic infrared imaging of fatigue cracks,' Int. Journal of Fatigue, Vol. 23, pp. 5471-5476, (2001)
5 X. Han, Z. Zeng, W. Li. S. Islam. J. Lu, V. Loggins, E. Yitamben, L. D. Favro, G. Newaz and R. L. Thomas, 'Acoustic chaos for enhanced detectability of cracks by sonic infrared imaging,' J. App!. Phys., Vol. 95, No.7, pp. 3792-3797, (2004)   DOI   ScienceOn
6 G. Busse, A. DiIlenz, and T. Zweschper, 'Defect-selective imaging of aerospace structures with elastic-wave-activated thermography,' SPIE, Vol. 4360, pp. 580-586, (2001)   DOI
7 J. C. Chen, J. Kephart and W. T. Riddell, 'A parametric study of crack propagation during sonic IR inspection,' Review of Quantitative Nondestructive Evaluation, Vol. 25. pp. 1577-1584, (2006)
8 T. Zweschper, G. Riegert, A. DiIlenz and G. Busse, 'Ultrasound burst phase thermography (UBP) for applications in the automotive industry,' AlP Conference Proceedings, Vol. 657, pp. 531-536, (2003)
9 L. D. Favro, X. Han, Z. Ouyang, G. Sun, H. Sui and R. L. Thomas, 'Infrared imaging of defects heated by a sonic pulse,' Rev. Sci. Instrum., Vol. 71, pp. 2418-2421, (2000)   DOI   ScienceOn
10 X. Han, Md. Sawar Islam, L. D. Favro, G. M. Newaz and R. L. Thomas, 'Simulation of sonic IR imaging of cracks in metals with finite element models,' Review of Quantitative Nondestructive Evaluation, Vol. 25. pp. 544-549, (2006)
11 R. B. Mignogna, R. E. Green Jr., J. C. Duke Jr., E. G. Henneke II and K. L. Reifsnider, 'Thermographic investigation of high-power ultrasonic heating in materials,' Ultrasonics, Vol. 19, pp. 159-163, (1981)   DOI   ScienceOn
12 X. Han, Z. Zeng, W. Li, S. Islam, J. Lu, V. Loggins, L. D. Favro, G. M. Newaz and R. L. Thomas, 'Importance of acoustic chaos in sonic IR imaging NDE,' Review of Quantitative Nondestructive Evaluation, Vol. 23. pp. 496-500 (2004)