Numerical analysis of two-way interaction between weld-pool and arc for GTA welding process

A mathematical model to describe the heat transfer and fluid flow in the mu tually coupled weld pool and are by an interactive free surface of the pool for a stationary gas tungsten are welding (GTAW) is developed. The two set s of governing equations and auxiliary formulas, controlling the weld pool and plasma are systems respectively, were solved by a finite difference met hod. A boundary-fitted coordinate system was adopted because the free surfa ce has a curved and unknown shape during welding. The results of this work provide a fundamental basis for predicting the behavior of an integrated we ld pool and are system from first principles.