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Induction Thermography of Surface Defects

  • Udo NetzelmannEmail author
Reference work entry

Abstract

A survey on theory, characteristic quantities, and the experimental technique of induction thermography is given. Induction thermography is used for surface defect detection in forged parts of ferromagnetic steel at typical frequencies of 100–300 kHz. Values for the detection limits for various types of cracks and approaches to determine crack depths are given. The sensitivity for crack detection is comparable to magnetic particle inspection. A hidden defect in ferritic steel with a coverage of 140 μm was detected by lowering the induction frequency down to 1500 Hz. Cracks in silicon solar cells were detected. Defects of fibers were detected in carbon fiber-reinforced polymer (CFRP). Inductive excitation is complementary to flash excitation. Crack detection in railway components like rails and wheels is shown. In rails, a larger defect could be detected from a test car moving at a speed of up to 15 km/h. A fully automated demonstrator for wheel testing was built up, which can detect surface defects in railway wheels with sensitivity comparable to magnetic particle testing. Standardization of thermography has gained progress in the last years and led to first standards on active thermography and induction thermography.

References

  1. Balaji L, Balasubramanian K, Krishnamurty C (2013) Induction thermography for non-destructive evaluation of adhesive bonds. In: Review of progress in quantitative nondestructive evaluation, vol 39, AIP conference proceedings 1511, pp 579–586Google Scholar
  2. Bamberg J, Erbeck G, Zenzinger G (1999) Eddy-Therm: Ein Verfahren zur bildgebenden Prüfung metallischer Bauteile. ZfP-Zeitung 68:60–62Google Scholar
  3. Bowler N (2006) Frequency-dependence of relative permeability in steel. Rev of Quant NDE 25:1269–1276Google Scholar
  4. Breitenstein O, Rakotoniaina J, Al Rifai M (2003) Quantitative evaluation of shunts in solar cells by lock-in thermography. Prog Photovolt Res Appl 11:515–526CrossRefGoogle Scholar
  5. Carslaw H, Jaeger J (1959) Conduction of heat in solids. Claredon Press, Oxford, p 80Google Scholar
  6. Ehlen A, Netzelmann U, Lugin S, Finckbohner M, Valeske B, Bessert S (2016) Automated NDT of railway wheels using induction thermography. In: Proceedings of the 55th annual conference of the British Institute of non-destructive testing, NottinghamGoogle Scholar
  7. Guo J, Gao X, Toma E, Netzelmann U (2017) Anisotropy in carbon fiber reinforced polymer (CFRP) and its effect on induction thermography. Nondestr Test Evaluat Int 91:1–8Google Scholar
  8. He Y, Tian G, Pan M, Chen D (2014) Impact evaluation in carbon fiber reinforced plastic (CFRP) laminates using eddy current thermography. Compos Struct 109:1–7CrossRefGoogle Scholar
  9. Heath D, Winfree W (1990) Quantitative thermal diffusivity imaging of disbonds in thermal protective coatings using inductive heating. In: Thompson DO, Chimenti DE (eds) Review of progress in quantitative nondestructive evaluation, vol 9. Plenum Press, New York, pp 577–584CrossRefGoogle Scholar
  10. Jäckel P, Netzelmann U (2013) The influence of external magnetic fields on crack contrast in magnetic steel detected by induction thermography. QIRT J 10:237–247CrossRefGoogle Scholar
  11. Koch S (2014) Non-destructive testing of bars by inductive heat-flux thermography. Millenium Steel India, pp 140–142Google Scholar
  12. Kremer K J (1984) Das THERM-O-MATIC-Verfahren – Ein neuartiges Verfahren für die Online-Prüfung von Stahlerzeugnissen auf Oberflächenfehler. In: Proceedings of the 3rd European conference in nondestructive testing, Florence, 15–18 October 1984, pp 171–186Google Scholar
  13. Lehtiniemi R, Hartikainen J (1994) An application of induction heating for fast thermal nondestructive evaluation. Rev Sci Instrum 65:2099–2101CrossRefGoogle Scholar
  14. Liang T, Ren W, Tian GY, Elradi M, Gao Y (2016) Low energy impact damage detection in CFRP using eddy current pulsed thermography. Compos Struct 143:352–361CrossRefGoogle Scholar
  15. Netzelmann U (2006) German Patent DE102006050025B3Google Scholar
  16. Netzelmann U, Walle G (2008) Induction thermography as a tool for reliable detection of surface defects in forged components. In: Proceedings of the 17th World conference on nondestructive testing, 25–28 Oct 2008, Shanghai, ChinaGoogle Scholar
  17. Netzelmann U, Walle G, Ehlen A, Lugin S, Finckbohner M, Bessert S (2016a) NDT of railway components using induction thermography. In: AIP conference proceedings 1706, 150001Google Scholar
  18. Netzelmann U, Walle G, Lugin S, Ehlen A, Bessert S, Valeske B (2016b) Induction thermography: principle, applications and first steps towards standardization. QIRT J 13:170–181CrossRefGoogle Scholar
  19. Oswald-Tranta B (2004) Thermoinductive investigations of magnetic materials for surface cracks. QIRT J 1:33–46CrossRefGoogle Scholar
  20. Oswald-Tranta B (2018) Induction thermography for surface crack detection and depth determination. Appl Sci 8:257CrossRefGoogle Scholar
  21. Riegert G, Zweschper T, Busse G (2004) Lockin thermography with eddy current excitation. QIRT J 1:21–32CrossRefGoogle Scholar
  22. Tang B, Hou D, Hong T, Ye S (2018) Influence of the external magnetic field on crack detection in pulsed eddy current thermography. Insight 60:240–246CrossRefGoogle Scholar
  23. Tsopelas N, Siakavellas N (2011) Experimental evaluation of electromagnetic-thermal non-destructive inspection by eddy current thermography in square aluminum plates. NDT & E Int 44:609–620CrossRefGoogle Scholar
  24. Vrana J, Goldammer M, Baumann J, Rothenfusser M, Arnold W (2008) Mechanisms and models for crack detection with induction thermography. In: Review of progress in quantitative nondestructive evaluation, vol 27, AIP conference proceedings 975, pp 475–482Google Scholar
  25. Walle G, Netzelmann U (2006) Thermographic crack detection in ferritic steel components using inductive heating. In: Proceedings of the 9th ECNDT Berlin, 25–29 Sept 2006, DGZfP Berichtsband BB 103Google Scholar
  26. Walle G, Valeske B, Netzelmann U (2009) Eine thermische Prüftechnik zur Oberflächenrissprüfung leitfähiger Materialien. Materialprüfung (9):593–602CrossRefGoogle Scholar
  27. Walle G, Netzelmann U, Stumm C, Valeske B (2012) Low frequency induction thermography for the characterization of hidden cracks in ferromagnetic steel components. In: Proceedings of the 11th international conference on quantitative infrared thermography (QIRT), 11–14 June 2012, Naples, Italy, paper 218Google Scholar
  28. Wang Y, Gao X, Netzelmann U (2018) Detection of surface cracks in metals under coatings by induction thermography. In: Proceedings of the 14th quantitative infrared thermography conference, Berlin 25–29 June 2018, DGZfP BB 167Google Scholar
  29. Wilson J, Tian G, Abidin I, Yang S, Almond D (2010) Pulsed eddy current thermography: system development and evaluation. Insight Non-Destr Test Cond Monit 52:87–90CrossRefGoogle Scholar
  30. Zenzinger G, Bamberg J, Satzger W, Carl V (2007) Thermographic crack detection by eddy current excitation. Nondestruct Test Evaluat Int 22:101–111CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Fraunhofer-Institute for Nondestructive Testing IZFPSaarbrückenGermany

Section editors and affiliations

  • Nathan Ida
    • 1
  • Norbert Meyendorf
    • 2
  1. 1.Department of Electrical and Computer EngineeringUniversity of AkronAkronUSA
  2. 2.Center for Nondestructive EvaluationIowa State UniversityAmesUSA

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