Vacuum arc double electrode remelting furnace
Vacuum arc double electrode remelting (VADER – Vacuum Arc Double Elec – trode Remelting) is a new development of vacuum arc remelting method for preparing fine equiaxed grain ingot. The process is that under the protection of vacuum or inert gas, the two metal consumes the electrode horizontally opposite, as the direct current cathode and the anode, the electricity causes the two poles to produce the arc discharge, two consumes the electrode end under the arc action Melt the film, converging into droplets, droplets in the gravity under the action of rotating non-water cooling mold solidification. Droplets in the process of dropping, leaving the heat source, subject to cooling, the temperature dropped to the liquidus and solidus between the liquid phase in a number of solid-state nuclei, coupled with rotating mechanical crushing effect, re-melting organization is fine Axis crystal.
VADER furnace, including DC power supply, furnace, electrode feed system, mold, spindle rotation system and water cooling system. The rotational speed of the mold is related to the diameter of the ingot and has an inverse relationship. Speed is usually below 60r / min. In order to maintain smooth melting of the two consumable electrodes, the two electrodes rotate in opposite directions around the horizontal axis during the remelting process and periodically switch their polarities. The furnace may be a fixed mold, an ingot mold or a mandrel crystallizer for the production of hollow ingots.
Edited by Jessica Wu
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