| About this Abstract |
| Meeting |
2022 AWS Professional Program
|
| Symposium
|
2022 AWS Professional Program
|
| Presentation Title |
Analysis of Temperature and Velocity Fields in the GTAW Arc for Argon |
| Author(s) |
Patricio Mendez, Alberto Velazquez, Marco Ramírez, Alfredo Delgado, Stefano Yeris Sacco |
| On-Site Speaker (Planned) |
Stefano Yeris Sacco |
| Abstract Scope |
This study developed a new mathematical model to quantify the width and length of the plasma arc in GTAW. This novel estimation process allows obtaining immediate results without convergence problems.
The methodology is based on similarity analysis of the non-isothermal Landau-Squire solution, which is an exact solution of the Navier Stokes and energy equations for a round laminar jet. While the Landau-Squire solution had been used before to approximate velocities in the arc, its application to the prediction of temperature had not been successful. The challenge overcame in this work, is to make a better systematic assessment of the power that must be assigned to the point heat source and, to modify where is the heat source located within the arc. The ultimate goal of this project is to obtain a general expression predicting the shape and temperature of the GTAW arc independent of any shielding gas.
The plasma behavior is modeled parametrically, with a critical temperature dividing the conducting and non-conducting behavior. For argon, this temperature is 7293 K, for helium is 12313 K and for CO2 is 6535 K.
Numerical simulations that account for temperature-dependent plasma properties were run to compare with the analytical treatment for the case of argon. The maximum error observed was 19 % for a current of 150 A. |
| Proceedings Inclusion? |
Undecided |