About this Abstract |
| Meeting |
2026 AWS Professional Program
|
| Symposium
|
2026 AWS Professional Program
|
| Presentation Title |
Estimation of Thermokinetic Parameters in WAAM-Fabricated ER308L Stainless Steel Using Infrared Thermography |
| Author(s) |
Karem Tello, Martin Cisternas, Fernanda Sotelo, Felipe Sandoval, Mauricio Solis, Felipe Soto, Manuel Tello Olivares |
| On-Site Speaker (Planned) |
Karem Tello |
| Abstract Scope |
Wire Arc Additive Manufacturing (WAAM) involves complex thermal cycles that strongly influence solidification conditions and the resulting microstructure. Understanding how these thermal conditions evolve during multilayer deposition is important for establishing relationships between processing parameters and material response. This work evaluates the use of infrared thermography to estimate thermokinetic parameters during the fabrication of ER308L stainless steel walls produced by WAAM.
Thermographic data were collected during the deposition of a 15-layer wall. Python-based scripts were developed to extract temperature profiles at the center of each deposited layer and process the corresponding cooling cycles. The experimental thermal histories were analyzed using Rosenthal’s analytical solution for a moving point heat source on a thin plate to estimate the effective thermal power (Q) associated with each deposited layer. In addition, thermal gradients in the liquid region (GL) and solidification rates (R) were estimated from melt pool dimensions and transverse temperature profiles for selected layers located at the bottom, middle, and top of the wall.
The results showed a progressive increase in effective thermal power from 874 J/s in the first layer to 2256 J/s in the fifteenth layer, indicating the cumulative effect of heat accumulation during multilayer deposition. At the same time, the thermal gradient decreased from 61.7 K/mm to 31.8 K/mm between the first and last analyzed layers. Solidification rates also decreased with wall height, from 3.21 mm/s in the first layer to 1.47 mm/s in the upper region of the wall. These trends are consistent with the reduction in cooling conditions caused by progressive substrate preheating during the WAAM process. The proposed methodology demonstrates that infrared thermography combined with analytical thermal models can provide quantitative information regarding thermal conditions and solidification behavior during WAAM. |
| Proceedings Inclusion? |
Undecided |