About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Process Development
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Presentation Title |
Pseudo Melt Pool Thermal Feature Construction for In-situ Thermography of Laser Powder Bed Fusion |
Author(s) |
Cody Lough, Robert Landers, Douglas Bristow, James Drallmeier, Edward Kinzel |
On-Site Speaker (Planned) |
Cody Lough |
Abstract Scope |
Manufacturing parts layer-by-layer with Laser Powder Bed Fusion (LPBF) permits non-contact spatiotemporal measurement of each layer’s thermal history. The thermographic measurements produce voxel-based temperature history data for a part’s volume that has applications in process validation and part qualification. Thermal feature extraction is a common post-processing technique that compresses this data to single value per voxel (e.g. maximum temperature and time above threshold). This compression potentially reduces the ability to flag a part’s defects. This paper presents a framework to retain all significant heating and cooling data for a voxel. The framework arranges a voxel’s time series temperature data into a pseudo melt pool (PMP) image. The PMP is a thermal feature that can leverage image classification algorithms and reveals obscured secondary features (i.e. PMP length, width, and aspect ratio). An experimental study compares the PMP’s part porosity correlation strength with the compressed thermal features’ correlation strengths. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |