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Measurement of Core Temperature through Semi-Transparent Polyamide 6 using Scanner-Integrated Pyrometer in Laser Welding

  • Predicting the core temperature during welding is an ambitious aim in many research works. In this work, a 3D-scanner with integrated pyrometer is characterized and used to measure the temperature during quasi-simultaneous laser transmission welding of polyamide 6. However, due to welding in an overlap configuration, the heat radiation emitted from the joining zone of a laser transmission weld has to pass through the upper polymer, which is itself a semi-transparent emitter. Therefore, the spectral filtering of the heat radiation in the upper polymer is taken into account by calibrating the pyrometer for the measurement task. Thermal process simulations are performed to compare the temperature field with the measured temperature signal. The absorption coefficients of the polymers are measured, in order to get precise results from the computation. The temperature signals during welding are in good agreement with the computed mean temperature inside the detection spot, located in the joining area. This is also true for varying laser power, laser beam diameter and the carbon black content in the lower polymer. Both, the computed mean temperature and the temperature signal are representing the core temperature. In order to evaluate the spatial sensitivity of the measurement system, the emitted heat radiation from both polymers is calculated on basis of the computed temperature field. Hereby it is found, that more than 90 percent of the detected heat radiation comes from the joining area, which is a crucial information for contact-free temperature measurement tasks on semi-transparent polymers.

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Author:Anton Schmailzl, Johannes Käsbauer, Jiří Martan, Petra Honnerová, Felix Schäfer, Maximilian Fichtl, Tobias LehrerORCiD, L. Prušáková, Jiří Tesař, J. Skála, Milan Honner, Stefan HierlGND
DOI:https://doi.org/10.1016/j.ijheatmasstransfer.2019.118814
Parent Title (English):International Journal of Heat and Mass Transfer
Publisher:Elsevier
Document Type:Article
Language:English
Year of first Publication:2020
Release Date:2021/02/04
Tag:Laser transmission welding; Pyrometer; Semi-transparent polymer; Temperature; measurement
Volume:146
Issue:January
Article Number:118814
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Laser-Materialbearbeitung (LMP)
Begutachtungsstatus:peer-reviewed
research focus:Produktion und Systeme
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG