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The influence of external magnetic fields on crack contrast in magnetic steel detected by induction thermography

: Jäckel, Patrick; Netzelmann, Udo

Volltext urn:nbn:de:0011-n-3371576 (752 KByte PDF)
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Erstellt am: 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
9 S.
International Conference on Quantitative InfraRed Thermography (QIRT) <11, 2012, Naples/Italy>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IZFP ()
magnetic fields; lock-in thermography; ferritic steel

Magnetic materials were investigated by induction thermography at induction frequencies of 80 - 300 kHz. The influence of an external magnetic field on the thermal crack contrast was studied. With proper orientation of the external field, the contrast increased by a factor more than three. Numerical simulations of the static and high-frequency magnetic fields and the temperature distribution were performed. Using a stationary induction field and a modulated external field in the frequency range of 0.28 to 36.5 Hz, lock-in thermography was realized, which shows cracks with good contrast. The technique was applied to crack detection in ferritic steel profiles.