Numerical simulation of temperature and fluid in GTAW-arc under changing process conditions

In this work, the heat and fluid flows in a free burning GTAW-arc under changing process conditions have been developed by a steady two-dimensional (2D) axisymmetric model. The temperature profiles, velocity profiles, distribution of potential and current density of the arc have been studied. A series of arc models are established by changing the welding process conditions, including welding current, flow rate of shielding gas, arc length and the kind of shielding gas. Governing equations, including heat and mass transfer equations, electromagnetic transport equations, are solved by finite volume method. (C) 2008 Elsevier B.V. All rights reserved.