Analysis of magnetohydrodynamics GTAW arc behavior

Roger, F.
Ecole Nationale Superieure de Techniques Avancées, PARIS

Argon plasma behavior in gas tungsten arc welding (GTAW) is directly linked to the weld quality. Indeed, the arc is the heat source which drives the weld shape.

Solution of an induction-diffusion equation under axial symmetry conditions has been developped using thermal conduction and convection module of FEMLAB 3.1©. We predict current distribution in electric arc, induced magnetic field and then resulting electromagnetic forces. The latter is introduced in incompressible axial symmetric Navier-Stokes equations. Both Pdes are strongly coupled. Indeed, Plasma velocity field introduces a source term in the induction diffusion equation.