| 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 |
The Detection of Defects Caused by Reduced or Interrupted Shield Gas Flow in Laser Powder Bed Fusion |
| Author(s) |
James Bell |
| On-Site Speaker (Planned) |
James Bell |
| Abstract Scope |
Without proper shield gas flow in laser powder bed fusion (LPBF), soot and condensate in the plume escaping the melt pool will interfere with the laser causing porosity. In this study gas flow was varied for several layers while building columnar parts located across the build plate, and the effect of blocking sections of the outlet while building was also investigated. Co-axial monitoring with a high-speed camera was used to determine whether the reduction in, and interruption of gas flow could be detected by changes in the melt pool geometry and other features indicative of suboptimal melting conditions. The flow speed was measured across the build chamber. Results showing the changes in monitoring signal due to reduced and interrupted gas flow are presented, as well as the induced differences in part quality. Transferability of the findings to a production system using a photodiode for melt pool monitoring will be discussed. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |