Numerical Simulation Of Gtaw Arc

In this work , a steady two-dimensional (2D) axisymmetric model has been developed in order to investigate heat transfer and fluid flows in a free burning GTAW arc, by the model,The velocity and temperature profiles of the arc has been simulated. The control equations was solved using a general thermofluid-mechanics computer program, PHOENICS(Parabolic hyperbolic or elliptic numerical integration code series) code, which is based on the SAMPLE algorithm.Based on many experience by other researcher, a hypothesis more nearing to reality has been used and a physical model of GTAW arc has been constructed. According to the characteristic of the PHOENICS, a BFC(body fitted coordination ) has been selected , appropriately total number of iteration has been adopted. In the VR (Visual Reality) interactive interface provided by the software, a GTAW arc geometrical 'model has been constructed in two-dimensional (2D) axisymmetry through main menu. Using PHOENICS code and developing it secondly, a series of subroutines has been programmed in the Ql file and GROUND file. Boundary conditions and special sources about temperature profile .velocity and potential profile have been loaded by these subroutines. The density of current and self-induced magnetic have been calculated by Ampere rule and Ohm rule, then magnetic force and joule warmth have been got .Consequently a series of distribution of temperature and fluid in arc under different conditions have been calculated. The simulated results of this work are in good agreement with experimental measurements by others. The results of simulation under different current, arc length and capacity of airstream show that the trends of change are in good agreement with arc theory. This can be considered a proof of exactness in the simulation. All of this have offered reasonable theoretical courses and instructions to the later research of arc physics and welding control. And this will promote the usage of PHOENICS code in the field of welding stimulation.