Detection of transient reflections during laser beam welding of copper

Andreas Ganser, Stefan Liebl, Patrick Schmitz, Michael F. Zaeh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations


The advantages of laser beam welding, such as its high flexibility, its high local energy input, and its fast processing speed, led to a substantial increase of industrial applications using this technology. However, only a portion of the laser energy is absorbed during welding due to reflections. These reflections can damage the system components and lead to a reduced process efficiency. Especially when welding copper materials with infrared laser beam sources, the reflections play a significant role, since the reflection coefficient of copper is very high at infrared wavelengths. Therefore, a formation of a keyhole is necessary for a stable and efficient welding process. A theoretical model for the calculation of the reflections on an arbitrary position above the process zone, as well as a radiation analyzer based on a modular set-up are presented. This device enables a time- and space-resolved measurement of the reflected radiation. Using the experimental results, characteristic positions on the hemisphere could be identified to calibrate the theoretical model. The calibrated model allows to analyze the reflected radiation during the welding process to determine the energy which is absorbed by the work piece.

Original languageEnglish
Title of host publicationHigh-Power Laser Materials Processing
Subtitle of host publicationLasers, Beam Delivery, Diagnostics, and Applications V
EditorsStefan Kaierle, Friedhelm Dorsch
ISBN (Electronic)9781628419764
StatePublished - 2016
EventHigh-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V - San Francisco, United States
Duration: 16 Feb 201618 Feb 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceHigh-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V
Country/TerritoryUnited States
CitySan Francisco


  • Copper
  • Efficiency
  • Energy distribution
  • Reflected laser radiation


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