About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
|
Symposium
|
Process Development
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Presentation Title |
In-situ Meltpool Monitoring and Temperature Estimation via Two-wavelength Pyrometry Using a Single Camera |
Author(s) |
Chaitanya Vallabh, Xiayun Zhao |
On-Site Speaker (Planned) |
Xiayun Zhao |
Abstract Scope |
In laser powder bed fusion processes, meltpool dynamics monitoring can help predict the process behavior and part condition. In this work, we present an in-situ meltpool monitoring approach built on the principles of two-wavelength pyrometry using a single high-speed camera as opposed to the typical utilization of multiple cameras. The camera and the optics system are coaxially aligned to the source laser and the reflected meltpool. The camera can continuously monitor the meltpool sufficiently fast (>100,000 fps) with a spatial resolution of 20 µm. The intensities of the meltpool at two wavelengths are analyzed for obtaining the temperature profile. The changes in meltpool morphology, laser scan speed and path are also monitored. Preliminary data shows a great potential of the developed method for continuously estimating meltpool temperature profile, and monitoring meltpool morphology and motion. Experimental data corresponding to these parameters can help correlate the process parameters to the part defects. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |