About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
Presentation Title |
Effect of Processing Conditions on the Background Signal in Acoustic Monitoring in Laser Powder Bed Fusion |
Author(s) |
Shivam Shukla, Milad Hamidi Nasab, Bey Vrancken |
On-Site Speaker (Planned) |
Shivam Shukla |
Abstract Scope |
Due to its high temporal resolution acoustic emission-based monitoring has shown great potential for laser powder bed fusion, as it enables to capture events in 10-100 μs time scale along with sub-surface information. However, being highly sensitive in nature, the obtained results are influenced by several non-process related factors other than the laser settings. In this study, a microphone and a vibro-acoustic sensor below the base plate are used to determine the effect of sample positioning, scan vector orientation, gas flow, and other background variables on the acoustic signals at a 1.25 MHz sampling rate. Results show that the microphone’s response is more susceptible to variations in these background processing conditions than for changes in the laser power and the scan speed, especially compared to the structure-borne acoustic emission sensor. The results can be leveraged to more comprehensively determine the acoustic background signals during LPBF, to improve the signal-to-noise ratio. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |