About this Abstract |
| Meeting |
2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Symposium
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2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
|
| Presentation Title |
Methodology for In-Process Emissivity Estimation of Wire-Arc DED Materials Using Welded Thermocouples and IR Cameras |
| Author(s) |
Charlotte Thompson, David Johnson, J. Logan Betts, Clark Hensley, Matthew W. Priddy |
| On-Site Speaker (Planned) |
Charlotte Thompson |
| Abstract Scope |
Wire-arc directed energy deposition relies on thermal monitoring to ensure part quality, yet variable emissivity of materials in this highly dynamic process has a significant impact on thermal measurement accuracy. Emissivity correction methods often address individual factors independently, limiting accuracy between material, geometries, and sensing modalities. In comparison, the method proposed in this study makes an aggregate emissivity correction that can be applied robustly across non-contact thermal monitoring devices. Two Optris XI-400 IR cameras with wavelength range of 8-14µm evaluate high and low temperature ranges during deposition and multiple ROIs for emissivity mapping across the part. IR measurements are compared to welded thermocouples to determine the appropriate emissivity over small and large raster blocks as well as a hollow cylinder of ER70S-6 to evaluate varied temperature ranges and thermal histories. This work provides a framework for dynamic emissivity estimation and transferability of this methodology between geometries and temperature profiles. |
| Proceedings Inclusion? |
Undecided |