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This document specifies the procedure of active thermography with inductive excitation for the
purpose of surface near defect tests.
Active thermography with inductive excitation is mainly applicable for testing of metallic test
objects:
Such tests are conducted for:
• the detection of surface cracks.
• the detection of concealed near-surface discontinuities.
• the detection volumetric inhomogeneities at joins (welding, soldering, …).
For this purpose, active thermography with inductive excitation is conducted using different
sources of excitation (induction generators, inductors) in reflection and transmission
configurations.
The requirements for the equipment, for the verification of the system, for the surface condition
of the part to be tested, for the recording, the processing and the interpretation of the results
are specified. Acceptance criteria are not defined.
Fields of application for active thermography with inductive excitation are to be found in
industrial manufacturing (vehicle, drive system and power plant components, jointing technique,
semi-finished products etc.).
The application of thermographic testing as a non-destructive and contactless testing method in
industry and research has increased remarkably during the last years as, among others, the method
can easily be automated. Using induction as heating source for the generation of the non-stationary
heat transfer has the advantage, that high heating rates can be achieved at metallic test objects. This
allows a fast and robust testing. In special for testing for cracks the method even allows a defect
selective detection of inhomogeneities in the test object. The application of induction as an excitation
technique in active thermography strongly needs to be adapted to the different testing problems, e. g.
like the detection of cracks, discontinuities, voids or the determination of the thermophysical material
properties. Thus, the performance of measurements as well as of data analysis must be described in
relation to the testing problem. As induction is basing on a strong electromagnetic field, industrial
safety measures for the performance of the tests must be considered. This standard will help
industrial companies, SMEs and researchers to achieve in an efficient way reliable results with active
thermography using induction as excitation technique.
The WI is based on DIN 54183 Non-destructive testing – Eddy-current excited thermography
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