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Low frequency induction thermography for the characterization of hidden cracks in ferromagnetic steel components

: Walle, Günter; Netzelmann, Udo; Stumm, Christopher; Valeske, Bernd

Fulltext urn:nbn:de:0011-n-3371589 (581 KByte PDF)
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Created on: 25.4.2015

Cardone, G.:
11th International Conference on Quantitative InfraRed Thermography, QIRT 2012. E-book proceedings : 11-14 June 2012, Naples, Italy
Online im WWW, 2012
ISBN: 978-889064844-1
7 pp.
International Conference on Quantitative InfraRed Thermography (QIRT) <11, 2012, Naples/Italy>
Conference Paper, Electronic Publication
Fraunhofer IZFP ()
thermography; electromagnetic

Induction thermography has been extended to the low frequency range of 300 to 2600 Hz. The electromagnetic skin depth is thereby increased in a way that in ferromagnetic steel hidden defects with 1.25 mm coverage could be detected by interaction of the induction currents with the crack. Numerical simulations of the internal current and temperature distributions were performed. Experimentally, artificial and natural cracks were studied. The influence of the electromagnetic excitation frequency was investigated. In plate-like geometries with hidden cracks starting at the back-side, an inversion of the defect contrast with frequency was observed and explained by simulation.