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Proceedings Paper

Development of nondestructive crack inspection technique for conveyance roll using vibro-thermography
Author(s): Daisuke Imanishi; Yoshiaki Nishina; Youichi Yoshinaga
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Paper Abstract

In recent study, active thermography has reached a high status as an easy and speedy defects inspection method in a NDT field. This paper newly proposes a non-disassembly and non-contact NDT method using the Vibro-Thermography for detecting and evaluating of fatigue cracks at neck parts of the conveyance roll in the steel making plant. In this method, fatigue cracks are detected as localized high temperature areas caused by friction and impact at crack surfaces with an infrared thermography, applying a high-amplitude ultrasonic vibration. In the case of the roll surface is covered with lubricating grease or dust, the crack detectability is shown. Self reference lock-in data processing technique is applied for improvement of signal noise ratio in the crack detection process. This technique makes it possible to perform correlating process without an external reference signal. Time and cost saving inspection method in the neck part of conveyance roll is carried out using this NDT technique.

Paper Details

Date Published: 18 May 2012
PDF: 8 pages
Proc. SPIE 8354, Thermosense: Thermal Infrared Applications XXXIV, 83540A (18 May 2012); doi: 10.1117/12.920707
Show Author Affiliations
Daisuke Imanishi, JFE Steel Corp. (Japan)
Yoshiaki Nishina, JFE Steel Corp. (Japan)
Youichi Yoshinaga, JFE Steel Corp. (Japan)

Published in SPIE Proceedings Vol. 8354:
Thermosense: Thermal Infrared Applications XXXIV
Douglas Burleigh; Gregory R. Stockton, Editor(s)

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