Experimental Investigation of Temperature Distribution during Wire-Based Laser Metal Deposition of the Al-Mg Alloy 5087

Abstract:

Wire-based laser metal deposition enables to manufacture large-scale components with deposition rates significant higher compared to powder-based laser additive manufacturing techniques, which are currently working with deposition rates of only a few hundred gram per hour. However, the wire-based approach requires a significant amount of laser power in the range of several kilowatts instead of only a few hundred watts for powder-based processes. This excessive heat input during laser metal deposition can lead to process instabilities such as a non-uniform material deposition and to a limited processability, respectively. Although, numerous possibilities to monitor temperature evolution during processing exist, there is still a lack of knowledge regarding the relationship between temperature and geometric shape of the deposited structure. Due to changing cooling conditions with increasing distance to the substrate material, producing a wall-like structure results in varying heights of the individual tracks. This presents challenges for the deposition of high wall-like structures and limits the use of constant process parameters. In the present study, the temperature evolution during laser metal deposition of AA5087 using constant process parameters is investigated and a scheme for process parameter adaptions in order to reduce residual stress induced componential distortions is suggested.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 988-994
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.988
• Online since: December 2018
• Authors: Martin Froend*, Frederic E. Bock, Stefan Riekehr, Nikolai Kashaev, Benjamin Klusemann, Josephin Enz
• Keywords: Aluminium Alloy, Laser Additive Manufacturing, Laser Metal Deposition (LMD), Process Parameters, Temperature Evolution

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