Study of Arc Electromagnetic Characteristics of Arc Plasma during the VAR Process

In this paper,a numerical simulation of arc region electromagnetic field has been done by establishing 3D finite element during VAR process,which is on the base of Magnetic fluid dynamics and plasma physics theory.The results show that the maximum current density and electromagnetic force are located at the bottom of remelting electrode and the current density and joule heat at the molten pool surface decreases with radial distance increases.The electromagnetic force at the molten pool surface hardly changes with a longer arc length but increases firstly and then decreases with the arc length is shorter.The joule heat at the molten pool surface which decreases with the arc voltage drops with the arc length increases but it's nearly the same when the arc length increases from 45 mm to 50 mm.