Thermal evaluation of MAG/TIG welding using numerical extension tool

Abstract

The manufacturing processes involving thermal transitions have been more used in industries nowadays, being the welding one of the most widely used. The requirement to design and predict adverse conditions are fundamental to the development of any mechanical project. As a result, the market needs have motivated the companies to find faster and more effective solutions, being one of a recent tools an ACT (Ansys Customization Toolkit) called "Moving Heat Source", in which is executed the Gaussian heat source to model welding and laser processes. Based on this, the present work proposes to evaluate the accuracy of that extension implementing a finite element model for the MAG/TIG welding processes in DINCK20 steel and Al6082-T6 aluminium alloy, comparing with one of the first mathematical model proposed by the literature (Rosenthal) and with a recent analytical method of high precision already validated experimentally. The results showed a smaller global error for MAG process (3~10%) when compared to TIG (15~18%) and, the temperatures measured on the surface of the plate presented errors lower than the bottom in both alloys.

Effect of Welding Sequence in Angular Distortion on Butt Joint GMAW Process

“…So, in the last years, some researchers have been studying the optimal parameters to minimize residual stresses [18]. These studies have been conducted using numerical [19] and experimental approaches [20] to achieve the appropriate balance between the level of residual stresses and the distortion value [21]. The most pronounced type of distortion in butt-welded plates is angular distortion [23]; it happens more frequently than other types of distortions, such as tailing and bending, and that is the reason why it is considered the most significant type of distortion [24].…”

“…So, in the last years, some researchers have been studying the optimal parameters to minimize residual stresses [18]. These studies have been conducted using numerical [19] and experimental approaches [20] to achieve the appropriate balance between the level of residual stresses and the distortion value [21]. Relationship between clamping degree and the level of distortion as well as the effect on residual stresses [22].…”

Heat transfer modeling during thermite welding of rails

“…Therefore, it is advisable to study the heat transfer process of thermite welding using software products. Currently, various software packages are used to simulate the rail welding process [8][9][10]. This article presents a model developed in the LVMFlow environment, which considers the heat transfer processes of the "casting mold -weld -rail" system, and it allows one to determine the temperature during the crystallization process of the welded joint.…”