Influence of Winding Dimensions on Electrical Parameters of the Induction System with a Magnetic Core for Magneto-Impulse Processing of Thin Non-Magnetic Metal Sheets

Plasticity of electrically conductive materials changes by flowing high-density currents through them. This electroplastic effect can be used to remove residual stresses of welds. In this article the induction system for decreasing residual stresses in welds of thin non-magnetic metal sheets of aluminum alloys 5056, 5083 and similar is investigated. The magneto-impulse method is used, which is based on inducing a pulsed eddy current in the weld. The aim of this work is to establish the dependence of electrical parameters (resistance, inductance) and current density in welds on the winding sizes in order to obtain the maximum current density in welds or reduce the requirements for a power source, taking into account skin and proximity effects of conductors in winding. The numerical calculation of the electromagnetic field by the finite element method in the mode of harmonic currents and in the mode of transient processes is used. The influence of winding sizes is established on resistance, inductance, current density of weld surface, AC/DC resistance ratio coefficient in winding in the calculation mode of harmonic currents. It also establishes the dependence of transient processes of pulsed current in winding, current density in weld of the induction system on cross-sectional dimensions of a coil and its wires.