Electroslag remelting of variable cross-section electrodes using a two-circuit scheme
The possibility of using electroslag remelting to recycle spent rolls from cold rolling mills and continuous casting machines is investigated. The expediency of remelting rolls without cutting off the necks and welding into a solid consumable electrode is shown. Experimental melts were used to investigate the use of ESR in a two-circuit scheme for remelting ingots of variable cross-section, which imitate rollers with necks. During the experimental melts, the geometry of the electrodes provided a change in the filling factor in a wide range from 0.69 to 0.2. It was experimentally confirmed that it is possible to surfacing an ingot while maintaining a constant cross-sectional profile of the liquid metal bath despite a significant change in the value of the filling factor during remelting. The mathematical modeling of the current distribution in the slag bath at ESR of electrodes of variable cross-section was carried out and the operating parameters of the remelting process were determined to obtain an ingot with a constant profile of the liquid metal bath along its cross-section. It has been established that the optimal conditions for preserving the remelting speed and depth of the two-phase zone are achieved when the electric power supplied to the consumable electrode exceeds the power supplied to the current-carrying mould by a factor of two.