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Control of the energy deposition during laser beam welding by oscillation techniques

Steuerung der Energiezufuhr während des Laserstrahlschweißens mit Hilfe der Oszillationstechnik
: Mahrle, A.; Beyer, E.

Vollertsen, F. ; Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in manufacturing 2007 : Proceedings of the Fourth International WLT-Conference Lasers in Manufacturing, LIM 2007, Munich, Germany, June 18th - 22nd, 2007
Stuttgart: AT-Fachverlag, 2007
ISBN: 978-3-00-021449-3
International Conference on Lasers in Manufacturing (LIM) <4, 2007, München>
Conference Paper
Fraunhofer IWS ()
beam oscillation; energy deposition control; modelling; zinc-coated steel; Laserstrahlschneiden; Stahlblech; Zinkbeschichtung; Oszillationsmethode; Energiezufuhr; Verfahrensparameter; Modellsimulation; Strahlauslenkung; Überlappung; Schlüssellocheffekt

Oscillation techniques during laser beam welding offer manifold possibilities to influence the energy deposition. In such a way, favourable changes of the process behaviour as well as the resultant weld seam properties should be feasible. However, the large variety of different process variants as function of the chosen oscillation regime and in dependence on the diverse welding parameters requires an appropriate understanding of the interaction among the relevant process variables. Therefore, the underlying physical relationships have been initially investigated through modelling and simulation of the energy deposition, taking into account different deflection methods and oscillation patterns. In a second step, diverse oscillation procedures have been derived for laser beam welding of zinc-coated steels in a gapless overlap joint configuration. As a result, the weld seam appearance could be improved by a longitudinal harmonic oscillation with proper values of the oscillation amplitude inducing a double keyhole process.
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