Calibration of thermographic spot weld testing with X-ray computed tomography
| Autor: | Philipp Myrach, Hubert Suwala, Florian Jonietz, Mathias Ziegler, Dietmar Meinel |
|---|---|
| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Computed tomography 02 engineering and technology 01 natural sciences spot weld Optics X ray computed Nondestructive testing 0103 physical sciences medicine Calibration Electrical and Electronic Engineering Instrumentation Spot welding spot weld testing 010302 applied physics medicine.diagnostic_test business.industry non-destructive testing computed tomography 021001 nanoscience & nanotechnology Thermography thermographic testing Tomography 0210 nano-technology business |
| Popis: | The paper presents an attempt for the calibration of an active thermography method that is suitable for the non-destructive evaluation of spot welds. Nowadays, the quality of spot welds is commonly characterised by the application of random chisel tests, which are time consuming, expensive and destructive. Recently a non-destructive testing method by means of active thermography was proposed that relies on the fact that the mechanical connection formed by the spot weld also serves as a thermal bridge between the two steel sheets joined in the welding process. It is shown in this paper that this thermal bridge can be thermographically characterised by extracting a measure for the spot weld diameter and hence the quality of the spot weld. The determination of the absolute value of the diameter hereby relies on a calibration of the testing system, which is performed by means of X-ray computed tomography in this study. The experiments were carried out using different experimental approaches, namely transmission as well as reflection geometry wSetup in reflectionith laser illumination. A comprehensive evaluation of samples produced using different welding currents, hence different quality, was carried out in order to validate the thermographic results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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