INFLUENCE OF A U-SHAPED MAGNETIC CORE OF AN INDUCTOR WITH TWO COILS ON EDDY CURRENTS OF THIN-WALLED NON-MAGNETIC METAL PLATES IN PROCESS OF MAGNETO-PULSED TREATMENT

Abstract

A review of the literature on the use of pulsed electric current to create electro-plastic effect in metal parts is performed. Inductor with a U-shaped magnetic core and pulsed current is investigated for processing thin-walled metal plates with rectilinear welds. With a saturated magnetic core relative magnetic permeability can be low, so using a magnetic core can be impractical. The aim of the work is to establish the influence of a magnetic core of an induction system on voltage, current and magnetic forces when reaching the eddy current density of 109 A/m2 in the weld of a non-magnetic thin-walled metal plate. A two-dimensional model of the induction system with and without the magnetic core is investigated here. Simulation of the distribution of electromagnetic fields with the reduction of the parameters of the two-dimensional model to three-dimensional is performed. A capacitor charged to a certain voltage is a source of pulsed currents in inductor winding. The equation of the electric circuit for determining the current in the inductor’s winding is solved. The influence of the dimensions of the magnetic core on voltage and currents in the inductor’s winding is determined. The influence of the magnetic core on the transients of voltages of capacitor and inductor, the currents in the winding and the weld of the metal non-magnetic plate, the magnetic forces in the weld is studied. The influence of the magnetic core on distribution of magnetic field strength, currents and magnetic forces on the surface of the plate in the area of the weld is studied. Ref. 13, Fig. 4, Table.