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The possibilities of and limits to detecting incomplete fusion via in-process monitoring in the case of laser welding

: Kuhl, M.; Mickel, P.-M.

Postprint urn:nbn:de:0011-n-1100304 (902 KByte PDF)
MD5 Fingerprint: c679a30973354e84a378553f0ae81ade
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Created on: 14.4.2011

Grau, A. ; Institute of Electrical and Electronics Engineers -IEEE-:
14th IEEE International Conference on Emerging Technologies and Factory Automation 2009. Proceedings : 22 - 26 September 2009, Palma de Mallorca
Piscataway, NJ: IEEE, 2009
ISBN: 978-1-4244-2728-4
ISBN: 978-1-4244-2727-7
International Conference on Emerging Technologies and Factory Automation (ETFA) <14, 2009, Palma de Mallorca>
Conference Paper, Electronic Publication
Fraunhofer IWU ()
laser welding; quality monitoring; process monitoring; fuzzy pattern recognition; Laser-Schweißen; Qualitätsüberwachung; Prozessüberwachung; Mustererkennung

Laser welding has a whole series of benefits such as high welding velocity or minor heat yield which is why it is becoming increasingly important. Meeting strength and quality requirements for welding seams is of eminent significance in automobile design. Unfortunately, there might be problems due to the degassing gaps needed between the joining parts when using the galvanized sheet metal. This causes incomplete fusion to form with excessively large gap dimensions that cannot be identified from outside. Nor do process monitoring systems available on the market detect these faults with sufficient reliability. VW Sachsen GmbH and the Fraunhofer Institute for Machine Tools and Forming Technology studied the reasons for the inadequacies of conventional systems in the MAINE X joint research project. This article presents the findings and makes recommendations for sufficient methods of detection.