| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Symposium
|
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Self-repair of Defects: The Achilles Heel for In-process Detection of Small Pores? |
| Author(s) |
Richard Williams, Sebastian Larsen, Harry de Winton, Paul Hooper |
| On-Site Speaker (Planned) |
Paul Hooper |
| Abstract Scope |
Pores created in laser powder bed fusion are frequently repaired as a natural part of the manufacturing process. This self-repair occurs because the melt pool spans several layers in depth, remelting material that contains pores created in previous layers. This self-repair presents a problem for in-process defect detection. Some pores that are detected will not be present in the final part, leading to high false positive rates even for a perfect system. In this work we conduct layer-wise ex-situ micro-CT scanning, where the build sample is removed from the machine after each layer, to observe pore locations and self-repair over a number of layers. In-process monitoring using off-axis illuminated imaging and co-axial melt-pool imaging is performed during the processing of each layer to look for signatures of pore formation and healing. Results showing links between the previously melted layer, the monitoring signals and the subsequent layer will be presented. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |