Influence of dynamic beam shaping on the geometry of the keyhole during laser beam welding

Jonas Wagner, Andreas Heider, Reiner Ramsayer, Rudolf Weber, Frauke Faure, Artur Leis, Nina Armon, Roey Susid, Oded Tsiony, Eyal Shekel, Thomas Graf

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

In deep penetration laser welding the shape of the keyhole is one of the determining variables for the energy input for each material and therefore has a significant influence on the resulting weld seam. A variation of the intensity distribution on the sample's surface changes the shape of the keyhole as well as the distribution of the locally absorbed irradiance within the keyhole. Coherent beam combining through optical phased arrays enables an almost arbitrary variation of the local intensity distribution of the laser beam as well as switching between different intensity distributions at high frequencies. The impact of dynamic beam shaping on the longitudinal and transversal extension of the keyhole was analyzed by means of streak images. Subsequently the frequency of changes in the extent were determined by the application of a fast Fourier transform on the grayscale values of the streak images. The results indicate a high correlation between the temporal variation of the intensity and the geometry of the keyhole.

Original languageEnglish
Pages (from-to)448-452
Number of pages5
JournalProcedia CIRP
Volume111
DOIs
StatePublished - 2022
Externally publishedYes
Event12th CIRP Conference on Photonic Technologies, LANE 2022 - Erlangen, Germany
Duration: 4 Sep 20228 Sep 2022

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Published by Elsevier B.V.

Keywords

  • beam shaping
  • coherent beam combining
  • keyhole geometry
  • laser welding

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