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Reflectometry-based investigation of temperature fields during dual-beam Laser Metal Deposition

: Gipperich, Marius; Peters, Christian; Riepe, Jan; Day, Robin; Bergs, Thomas


Gu, B. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Laser 3D Manufacturing VIII : 6-11 March 2021, Online Only, United States
Bellingham, WA: SPIE, 2021 (Proceedings of SPIE 11677)
ISBN: 978-1-5106-4189-1
ISBN: 978-1-5106-4190-7
Paper 116770R, 9 pp.
Conference "Laser 3D Manufacturing" <8, 2021, Online>
Deutsche Forschungsgemeinschaft DFG
Grundlagenuntersuchungen zur Erweiterung des Verständnisses eines 2-Strahl-Laserprozesses für metallische Werkstoffe
Conference Paper
Fraunhofer IPT ()
additive manufacturing; AM; laser metal deposition; LMD; dual-beam process; temperature field; laser absorption; Optical Backscatter Reflectometry; OBR

Laser Metal Deposition (LMD) is a high deposition rate metal Additive Manufacturing process. Its applications are basically repair, cladding and manufacturing. The two most commonly used LMD processes are powder-based (LMD-p) and wire-based (LMD-w). Despite the fact that wire-based LMD is more material efficient, process stability is a major concern. By adding a modulated laser beam to the continuous process beam, a change of the melt pool geometry and increased energy absorption are observed. This relation shows great potential to increase process stability. In this contribution, the positive effect of the dual laser-beam use on LMD-w processes is demonstrated. To understand the cause-effect relation, the workpiece temperature field was investigated by optical backscatter reflectometry ( OBR). The results were then correlated to simultaneously performed IR camera measurements of the workpieces upper surface. By better understanding the thermal phenomena in dual-beam LMD, research can improve process temperature control. This leads to a new perspective for the LMD-w manufacturing process in many industry sectors such as mobility, energy and engineering.