Análise térmica do processo de soldagem TIG de amostras metálicas

Abstract

Problems involving heat transference with phase change occur in several industrial processes, such as metal processing, casting solidification, environmental engineering and thermal system of energy storage in a space station. The main difficulty in solving thermal problems with phase change is the solid-liquid interface position identification due to the particular physical properties behavior in the domain for each phase. Thus, for a better comprehension and study of this kind of problems, this work presents a numerical solution of the diffusion equation based on the enthalpy formulation. The purpose of this work is developing a technique to obtain the heat flow, temperature profile and the weld pool geometry during the welding process TIG of cylindrical samples of stainless steel AISI 304. Accordingly, the thermal problem is treated as an inverse problem of heat transference with phase change and experimental data concerning the temperature of the welded piece and the size fused area will be used to validate the thermal model proposed in this work. It is emphasized that the inverse technique of the Golden Section will be applied to determinate the heat input during the welding process. Furthermore, this work presents an analysis of errors inherent to the numerical thermal model and the experimental data.