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Open AccessArticle

Pulsed Laser Influence on Temperature Distribution during Dual Beam Laser Metal Deposition

1
Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University, Campus-Boulevard 30, 52074 Aachen, Germany
2
Fraunhofer Institute for Production Technology IPT, Steinbachstraße 17, 52074 Aachen, Germany
*
Author to whom correspondence should be addressed.
Metals 2020, 10(6), 766; https://doi.org/10.3390/met10060766
Received: 4 May 2020 / Revised: 29 May 2020 / Accepted: 5 June 2020 / Published: 9 June 2020
(This article belongs to the Special Issue Additive Manufacturing of Metals with Lasers)
Wire-based Laser Metal Deposition (LMD-w) is a suitable manufacturing technology for a wide range of applications such as repairing, coating, or additive manufacturing. Employing a pulsed wave (pw) laser additionally to the continuous wave (cw) process laser has several positive effects on the LMD process stability. The pw-plasma has an influence on the cw-absorption and thus the temperature distribution in the workpiece. In this article, several experiments are described aiming to characterize the heat input during dual beam LMD. In the first setup, small aluminum and steel disks are heated up either by only cw or by combined cw and pw radiation. The absorbed energy is then determined by dropping the samples into water at ambient temperature and measuring the water’s temperature rise. In a second experiment, the temperature distribution in the deposition zone under real process conditions is examined by two-color pyrometer measurements. According to the results, the pw plasma leads to an increase of the effective absorption coefficient by more than 20%. The aim of this work is to achieve a deeper understanding of the physical phenomena acting during dual beam LMD and to deploy them selectively for a better and more flexible process control. View Full-Text
Keywords: laser metal deposition; dual beam; laser absorption laser metal deposition; dual beam; laser absorption
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MDPI and ACS Style

Gipperich, M.; Riepe, J.; Arntz, K.; Bergs, T. Pulsed Laser Influence on Temperature Distribution during Dual Beam Laser Metal Deposition. Metals 2020, 10, 766.

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