Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
A HEAT SOURCE MODEL TO SIMULATE WELDING PROCESSES WITH MAGNETIC DEFLECTION
Submission Author:
Fernanda Clain , RS
Co-Authors:
Douglas Araujo, Paulo Teixeira
Presenter: Fernanda Clain
doi://10.26678/ABCM.ENCIT2016.CIT2016-0514
Abstract
Welding with weaving has been widely used for improving process efficiency and distribution of heat input. The technique of weaving by magnetic deflection of the arc was developed a few years ago to enable the oscillation of the weld pool, thus, causing grain refinement and improving the properties on the welded joint. The numerical simulation of this type of process is very difficult, since the numerical models proposed up to now have shown good accuracy only for cases in which the torch is perpendicular to the welding plane. This paper aims to describe a numerical heat source model, including the effects of arc deflection on bead-on-plate GTAW process. Numerical simulations are carried out with a fixed inclination throughout the welding process and with the torch perpendicular to the welding plane. Results are compared to the ones obtained experimentally. Temperatures at three different points on the bottom of the plate (two out of the center line and one in the center line of welding) and weld pools of SAE 1020 3-mm thick steel plates are analyzed. Results obtained by numerical simulations are very close to the experimental ones. In the case of welding with arc deflection, temperatures of thermocouples placed on the side in which the arc was deflected and on the center are very similar. Weld penetration is higher in the welding whose torch is perpendicular to the plane than in the welding with arc deflection. The fusion zone shape is asymmetric for welding with arc deflection.
Keywords
GTAW process, magnetic arc deflection, heat source model, Numerical simulation
