About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Presentation Title |
In-Situ Determination of Powder-Laser Focus Overlap in High-Speed DED Using Multispectral Emission Analysis |
Author(s) |
Patrick Gajek, Helena Wexel, Frederik Zanger |
On-Site Speaker (Planned) |
Patrick Gajek |
Abstract Scope |
Precise spatial alignment between the laser and powder focus is critical for achieving complete particle melting and stable process conditions in high-speed Directed Energy Deposition (HS-DED). This work presents an in-situ diagnostic approach using a photometric emission sensor to identify and calibrate the spatial overlap of laser and powder focus during the deposition of AISI 316L. During the incremental translation of the powder nozzle towards the laser focal point, spectral emission data are recorded and subsequently correlated with the local photometric intensity and the corresponding spectral temperature distribution. A distinct emission maximum and consistent spectral shift are observed when the powder focus coincides with the laser focus, indicating optimal energy absorption and melting behavior. This method allows precise focus alignment without invasive measurements, improving reproducibility and deposition quality. The approach presented supports process monitoring and control related high-speed DED systems, and is broadly transferable across materials and system configurations. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |