Preprint has been published in a journal as an article
DOI of the published article https://doi.org/10.1364/OPTCON.529573
Preprint / Version 2

Backscatter absorption spectroscopy for process monitoring in powder bed fusion

##article.authors##

  • Matthias Beuting Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA https://orcid.org/0000-0002-0662-4848
  • Alex Fairhall Department of Chemistry, University of Wisconsin-Madison, Madison, USA
  • Randall Goldsmith Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
  • Lianyi Chen Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA
  • Scott Sanders Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA

DOI:

https://doi.org/10.31224/3429

Keywords:

Process Monitoring, Absorption Spectroscopy, Powder Bed Fusion, Melt Pool Dynamics, Vapor Plume

Abstract

Laser powder bed fusion is a metal 3D printing technology that involves melting and solidifying a metal powder using a process laser or electron beam. The interaction of metal vapors with the melt pool is known to cause manufacturing defects. Here we use absorption spectroscopy of laser light reflected from the liquid metal surface to measure atomic Ti vapor during processing of Ti-6Al-4V inside the vapor cavity forming in the melt pool. The absorption line strength and shape were found to vary significantly with processing parameters. In addition, laser-induced fluorescence (LIF) was observed, providing further opportunities for in situ diagnostics.

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Posted

2024-01-02 — Updated on 2024-07-31

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Copyright (c) 2024 Matthias Beuting, Alex Fairhall, Randall Goldsmith, Lianyi Chen, Scott Sanders

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Version justification

The paper was accepted, so I replaced the manuscript with the accepted manuscript.