About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Special Session
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Presentation Title |
Recent Advances in Laser-wire Directed Energy Deposition: Novel Modes of Thermal Control and Site-specific Melt Pool Size Control |
Author(s) |
Brian T. Gibson, Paritosh Mhatre, Bradley Richardson, Lonnie Love |
On-Site Speaker (Planned) |
Brian T. Gibson |
Abstract Scope |
This presentation will highlight recent advances in techniques for the control of thermal properties and the deposition of dynamic bead geometries in a laser hot-wire directed energy deposition process being developed by Oak Ridge National Laboratory in partnership with GKN Aerospace. First, issues related to real-time closed loop melt pool size control will be presented, followed by the development novel control variants that stemmed from the use of this form of control. One such variant is average power control via manipulation of print speed and deposition rate, which when performed on a layer-wise basis in tandem with real-time melt pool size control, has been shown to prevent laser power reductions and increase process efficiency as heat accumulates in the object under construction. Secondly, site-specific melt pool size control will be presented with two primary use cases highlighted: surface modification (embossing of secondary geometries) and mitigation of volumetric defects. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |