Benchmarking a multi-layer approach and neural network architectures for defect detection in PBF-LB/M

Voigt, Jorrit; Moeckel, Michael

doi:10.1016/j.mtcomm.2022.104878

Cited by 1 publication

(1 citation statement)

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“…In situ quality control instrumentation has several advantages over post-processing measures, however, today, mainly cameras or pyrometers are available as PBF-LB machine upgrades-Here, one possibility is the online camera-supported observation of individual layers during the PBF-LB, which can lead to the identification of defects in each printed line. [7] In addition, in-situ pyrometry and thermography are used for process monitoring and regulation [8], at least in research, but they cannot make any statements about the chemical composition. Today, sensors that gather chemical or compositional information are rarely embedded in quality control development strategies.…”

Section: Introductionmentioning

confidence: 99%

In-situ monitoring of the material composition in PBF-LB via optical emission spectroscopy

Ziefuß

Streubel

Gabriel

et al. 2023

Preprint

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Powder bed fusion using a laser beam of metals (PBF-LB/M) is a widely used additive manufacturing (AM) technique that enables the material-efficient fabrication of complex geometries in metallic parts. However, achieving high-quality parts with desired properties heavily depends on variances in the manufacturing process and powder composition, making quality control an indispensable aspect of almost all applications. Today, mainly grayscale imaging or pyrometry are employed, whereas in situ recording of chemical (compositional) information has rarely been done during LBF-LB/M. This pilot study explores the feasibility of in-situ optical emission spectroscopy (OES) for elemental analysis of metallic samples during PBF-LB, at the example of Nd-Fe-B. Our findings suggest that the local emissivity of Fe and Nd lines can serve as a reliable indicator to determine the temperature and elemental concentration in the plasma. The results showed that Online-OES during PBF-LB enables tracking of how Nd content in as-build parts critically depends on the laser parameter used while printing the part.

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Section: Introductionmentioning

confidence: 99%