THE NUMERICAL MODELLING BY THE METHOD OF THE FINITE DIFFERENCES OF THE ELECTRO-SLAG WELDING PROCESS IN ELECTROMAGNETIC FIELD

摘要

The phenomena of physical nature from the slag welding pool are complex and their mathematical modelling requires the application of the vectorial field's theory. The agitation by electromagnetic way of the melted slag, due to the field of speeds, influences - through the equation of movement - the density of current and in the end the distribution of the temperature in the slag welding pool. The phenomena from the slag welding pool, during the welding process, are determined by the presence and the interaction of the following fields: the electrical field, the magnetic field, the thermal field, the hydrodynamic field. The process of geometric definition of the model consists in the imposing of an assembly of conditions must be satisfied by the coordinates of the nodes by means of discreet operators. The simulation of the welding process was made in the vertical plane (X, Z) for the determination of the thermal field, of the density of current, of the agitation speed of the pool and for the electromagnetic force. For the determination of the electric potential and of the magnetic induction a simulation in the horizontal plane was made (X, Y).