Optical measurement of the connection state in laser brazing

Felix Tenner, Stephan Ramoser, Michael Dobler, Zeev Zalevsky, Michael Schmidt

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The laser brazing of steel sheets is widely applied in car-body manufacturing. The critical value for the strength of the joint is the minimal connection width between the two sheets. However, this value is depending on the feed rate and power of the laser and the feed rate and preheating current of the filler wire used. Furthermore, the wetting behavior of the brazing solder is affected by the surface properties of the joining partners and is thus prone to errors. Currently, mostly destructive testing is used to evaluate the connection state. Therefore, we studied a novel optical measurement technique which is capable of remotely measuring oscillations of the joining partners. In the proposed study, we show how the oscillations are connected to the process behavior and the fusion area and how the setup might be applied as a post- and in-process measurement system.

Original languageEnglish
Pages (from-to)1233-1243
Number of pages11
JournalPhysics Procedia
StatePublished - 2016
Event9th International Conference on Photonic Technologies, LANE 2016 - Furth, Germany
Duration: 19 Sep 201622 Sep 2016

Bibliographical note

Publisher Copyright:
© 2016 The Authors.


  • laser brazing
  • oscillation measurement
  • sensing


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