Abstract
In the rolling industry, a type of alloyed scrap is waste generated from used knives for cutting metal, with a significant proportion of failed circular knives. It is proposed to manufacture remelted electrodes for ESR from used knives of the same standard size. To obtain a cylindrical electrode for better thermal and electrical contact, the disks are pressed against each other under a pressure of at least 1 MPa and welded together using argon or plasma arc welding. An electrode made in a similar way from used circular knives has anisotropy of properties. An algorithm is shown for determining the effective coefficient of thermal conductivity and specific electrical resistance in the axial direction of the electrode, taking into account the transfer of heat and electric current through the contact zone of two metal discs. A method is proposed for calculating the non-stationary temperature distribution along the length of the electrode until the beginning of its melting. For the stationary mode of remelting, dependences are given for evaluating the mass and linear melting rates of the electrode for a given geometry and known thermophysical properties. It is shown that for electrodes with the same outer diameter, the composite electrode obtained from the spent disk knives has a higher mass and linear melting rate than a cast electrode.
Keywords
Circular knives for metal, electroslag remelting, alloy steel, remeltable electrode, anisotropy of properties, linear electrode melting rate.