Laser Beam Melting of Metals (LBM-M) is an additive manufacturing technique that is applied successfully for the production of complex parts, small batch series and prototypes. In LBM metallic parts are generated layer by layer directly from sliced CAD data. For each layer a thin powder layer is deposited and subsequently irradiated by a focused laser beam which is guided by a galvanometer scanner. Due to variations in the powder stock, plain parameter sets and unresolved machine maturity problems, quality fluctuations are a major problem for a future series production. Surface roughness of parts during manufacturing is a quality issue. In this paper, we address it with a coaxial melt pool monitoring system and show a method for inline evaluation of surfaces by means of melt pool monitoring and the results of applied remelting strategies.
Kolb, T., Müller, L., Tremel, J., & Schmidt, M. (2018). Melt pool monitoring for laser beam melting of metals: Inline-evaluation and remelting of surfaces. In Procedia CIRP (Vol. 74, pp. 111–115). Elsevier B.V. https://doi.org/10.1016/j.procir.2018.08.052