Comparison of Inductive Thermography and Computer Tomography Results for Short Surface Cracks

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Inductive thermography is a non-destructive testing method, whereby the workpiece to be inspected is slightly heated by a short inductive heating pulse. An infrared camera records the surface temperature during and after the heating pulse. As defects influence the induced eddy current distribution and the heat flow, they become highly visible in the evaluated infrared images. The deeper a crack is, the greater the obstacle it represents. In Inconel welded samples, short surface cracks (length 0.3–2 mm) were created using a so-called Varestraint test machine. The samples were inspected via inductive thermography and computer tomography (CT). Additional finite element simulations were calculated in order to model the thermography experiments. The comparison of the thermographic, CT and simulation results shows how the thermographic signal of a defect depends on its geometry. This information can be used for calibration to estimate the crack properties based on the thermographic inspection.
Original languageEnglish
Article number36
Number of pages5
JournalEngineering proceedings
Issue number1
Publication statusPublished - 14 Nov 2023
EventAdvanced Infrared Technology and Applications - Cotonificio Veneziano IUAV University of Venice, Venice, Italy
Duration: 10 Sept 202313 Sept 2023

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