A Three-Dimensional Transient Finite Element Model for TIG Welding
by
P. Tekriwal
M. Stitt
J. Mazumder
Department of Mechanical and Industrial Engineering
Abstract
A three-dimensional mathematical model has been developed for arc welding processes. The model has been used to simulate TIG (Tungsten Inert Gas) welding process and can be extended for MIG welding process also. While the temperature profile show the same trend as reported in literature, close agreements have been found between the numerically estimated and the experimentally observed results for the aspect ratios of the stainless steel weld bead. Cooling rate predictions in different regions of the melt pool qualitatively agree with the dendrite arm spacing measurements. The region with high cooling rate has low dendrite arm spacing.
The finite element program ABAQUS has been used in order to obtain the numerical results. The formulation of the problem is described in detail and the subroutines that were used in conjunction with the ABAQUS program have been mentioned. These subroutines calculate the arc heat input, heat transfer coefficients at the integration point and generate a suitable mesh for the model.
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