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Camera-based in-process quality measurement of hairpin welding

Hartung, J.; Jahn, A.; Bocksrocker, O.; Heizmann, M.


The technology of hairpin welding, which is frequently used in the automotive industry, entails high-quality requirements in the welding process. It can be difficult to trace the defect back to the affected weld if a non-functioning stator is detected during the final inspection. Often, a visual assessment of a cooled weld seam does not provide any information about its strength. However, based on the behavior during welding, especially about spattering, conclusions can be made about the quality of the weld. In addition, spatter on the component can have serious consequences. In this paper, we present in-process monitoring of laser-based hairpin welding. Using an in-process image analyzed by a neural network, we present a spatter detection method that allows conclusions to be drawn about the quality of the weld. In this way, faults caused by spattering can be detected at an early stage and the affected components sorted out. The implementation is based on a small data set and under consideration of a fast process time on hardware with limited computing power. With a network architecture that uses dilated convolutions, we obtain a large receptive field and can therefore consider feature interrelation in the image. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000140694
Veröffentlicht am 06.12.2021
DOI: 10.3390/app112110375
Zitationen: 6
Web of Science
Zitationen: 5
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Industrielle Informationstechnik (IIIT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2076-3417
KITopen-ID: 1000140694
Erschienen in Applied Sciences (Switzerland)
Verlag MDPI
Band 11
Heft 21
Seiten Art.Nr. 10375
Vorab online veröffentlicht am 04.11.2021
Schlagwörter hairpin; laser welding; semantic segmentation; dilated convolution; sdu-net; spatter detection; quality assurance; fast prediction time
Nachgewiesen in Scopus
Web of Science
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