About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
In-situ Measurement of Melt Pool Emissions via Coaxial Spectrometry in Powder-blown Directed-energy Deposition |
Author(s) |
Rujing Zha, Samantha Webster, Jihoon Jeong, Alberto Castro, Jian Cao |
On-Site Speaker (Planned) |
Rujing Zha |
Abstract Scope |
Laser powder blown directed-energy deposition (LPB-DED) is a highly flexible metal additive manufacturing technique with applications in aerospace and automotive fabrication and repair. Coaxial monitoring of the melt pool using a photodiode array provides a high-frequency, inexpensive data stream that will enable open- and closed-loop control of the process. However, photodiode readings have not yet been compared with spectrometer measurements to better connect photodiode readings with melt pool conditions. While past work has used spectrometers to monitor LPB-DED, none have correlated results from a coaxially mounted spectrometer with photodiode readings to the authors’ knowledge. To fill this gap, cladding of alloy 718 on 1045 carbon steel was coaxially monitored with a photodiode array and a spectrometer (200-1120 nm range). Laser power, powder flow rate, scan speed, laser focus, and standoff distance were varied across the clads. Correlations were found between spectrometer readings, photodiode readings, and clad dimensions. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |