Influence of steady electric-magnetic compound field on the melt pool dynamics behavior during laser cladding

Abstract

In order to regulate the melt pool dynamics, a method was presented through stationary magnetic field and electric field coupling to form the directional Lorentz force in the melting pool during the process of laser cladding in this paper. Under the electric-magnetic compound field, both the induced Lorentz force and directional Lorentz force are formed in the molten pool. Based on the multi-physical field coupling theory, Laser cladding melt pool model was built with consider of morphology, buoyancy, Lorentz force and melt pool surface tension. The effect of extra electric-magnetic on temperature field and flow field was studied. The flow in the melt pool as well as the geometry was significantly changed by the directional Lorentz force distribution in the liquid metal. The numerical results with current density 5×106 A/m2, magnetic flux density 0.6 T indicated that directional Loren force had less effect on the melt pool velocity than that of the induced Lorentz force caused by the steady magnetic field, which is opposite to the melt flow. It reveals that upward Lorentz force can decrease the surface temperature for the change of the melt pool shape and the application of the steady magnetic field and downward Lorentz force had slightly influence on the melt pool surface temperature.In order to regulate the melt pool dynamics, a method was presented through stationary magnetic field and electric field coupling to form the directional Lorentz force in the melting pool during the process of laser cladding in this paper. Under the electric-magnetic compound field, both the induced Lorentz force and directional Lorentz force are formed in the molten pool. Based on the multi-physical field coupling theory, Laser cladding melt pool model was built with consider of morphology, buoyancy, Lorentz force and melt pool surface tension. The effect of extra electric-magnetic on temperature field and flow field was studied. The flow in the melt pool as well as the geometry was significantly changed by the directional Lorentz force distribution in the liquid metal. The numerical results with current density 5×106 A/m2, magnetic flux density 0.6 T indicated that directional Loren force had less effect on the melt pool velocity than that of the induced Lorentz force caused by the steady magnetic field...