| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Metal Transfer and Mixing Control for Multi-wire Arc DED of Bimetallic and Graded Material Features |
| Author(s) |
Nate Sena, Dennis Harwig |
| On-Site Speaker (Planned) |
Nate Sena |
| Abstract Scope |
Dissimilar metal feedstocks in directed energy deposition AM are needed to create parts with tailored material properties such as impact strength and thermal expansivity to maximize performance in extreme environments. Geometry can be deposited with a static composition between two or more mixed wires for on-the-fly alloy configuration, or functionally gradient parts can be built with varying composition throughout the build or weld directions to optimize local material performance. Both of these cases may command moderate to extreme wire mixing ratios where uncontrolled metal transfer behavior has been found to induce compositional and or geometric inconsistency during deposition. Dual-wire GTAW and Tandem-GMAW technology was developed to provide uniform weld pool mixing, stable metal transfer, and omnidirectional travel capability under moderate to extreme wire mixing ratios. A range of wire apparatus designs and / or control logic was developed with each process to improve deposit composition control. Results show that good mixing can be accomplished between dissimilar high strength steels from 90%-10% wire feed speed ratio and vise- versa with optimal process conditions. Ongoing work will be used to optimize gradient profiles for preferred properties depending on alloys system for bimetallic, trimetallic and graded material DED structures. |
| Proceedings Inclusion? |
Undecided |