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Influence of focal length on the laser metal deposition process with coaxial wire feeding
Author(s): Jana Kelbassa; Alexander Biber; Konrad Wissenbach; Andres Gasser; Oliver Pütsch; Peter Loosten; Johannes Henrich Schleifenbaum
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Paper Abstract

In some applications of Laser Metal Deposition (LMD) the advantages of the utilization of wire instead of powder additives can be used. The use of a wire as a solid additive material eliminates major disadvantages of powder-based LMD processes, namely contamination of the process cell with metal powder, significant material losses during the process, health and safety issues as well as the impact of insufficient powder quality. A closed annularly shaped laser beam surrounding the wire is one of the distinguishing features of the discussed LMD processing head. The laser beam and wire are arranged coaxially to each other, with the wire being fed through the inside of an annularly shaped laser beam without any shadowing. The annularly shaped intensity profile leads to a significant improvement in wire-based LMD. Furthermore, in contrast to lateral wire feeding, two substantial technological advantages, namely the independence of the feed direction and the processing of complex 3D geometries can be identified. Since the angle of incidence on the wire and base material depends on the caustic of the annularly shaped laser beam, the focal length has a significant influence on the LMD process. The results of experiments with different focal lengths are discussed. Material samples from Inconel 718 are built and evaluated metallographically. With the help of a high-speed camera the varying process behavior in dependence of the focal length and laser beam quality is analyzed. Finally, an outlook towards future research will be given.

Paper Details

Date Published: 27 February 2019
PDF: 12 pages
Proc. SPIE 10911, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VIII, 109110D (27 February 2019); doi: 10.1117/12.2507799
Show Author Affiliations
Jana Kelbassa, Fraunhofer-Institut für Lasertechnik (Germany)
Alexander Biber, Fraunhofer-Institut für Lasertechnik (Germany)
Konrad Wissenbach, Fraunhofer-Institut für Lasertechnik (Germany)
Andres Gasser, Fraunhofer-Institut für Lasertechnik (Germany)
Oliver Pütsch, RWTH Aachen Univ. (Germany)
Peter Loosten, RWTH Aachen Univ. (Germany)
Johannes Henrich Schleifenbaum, Fraunhofer-Institut für Lasertechnik (Germany)
RWTH Aachen Univ. (Germany)

Published in SPIE Proceedings Vol. 10911:
High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VIII
Stefan Kaierle; Stefan W. Heinemann, Editor(s)

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