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 |
Effectiveness of Shielding Gas in Wire-arc Additive Process |
Author(s) |
Bishal Silwal, Niraj Pudasaini, Andrzej Nycz |
On-Site Speaker (Planned) |
Bishal Silwal |
Abstract Scope |
Wire-arc additive manufacturing is the direct energy deposition process by which a large, metallic structure is built layer-by-layer using a welding arc to melt a wire feedstock. In this process, the proper selection of shielding gas plays a vital role in depositing structurally-sound part geometries and achieving dimensional accuracy and better surface finishes. In the following study, the authors used shielding gases with varying concentrations of Helium (He), Argon (Ar) and CO2 (ternary mix) to deposit wall geometries using a wire-based additive manufacturing system developed at Oak Ridge National Laboratory’s Manufacturing Demonstration Facility. The results indicate some discrepancies in surface finish and dimensional accuracy. These results indicate that the arc characteristics and heat intensity have a significant impact on the weld bead compared to the surface tension effect due to surface-active elements, which is further verified by developing and analyzing a computational fluid dynamics model. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |