An improved vacuum consumable device and vacuum consumable smelting method

Abstract

This invention discloses an improved vacuum consumable electrode device and a vacuum consumable smelting method. The improved equipment includes an electromagnetic induction coil (9) installed inside the vacuum consumable furnace, and a high-temperature resistant sealing ring (6) between the transition electrode (7) and the pull rod (3) to form a helium cooling channel. The process optimization reduces the internal temperature difference of the consumable electrode during the arc initiation stage and subsequent melting stages, decreasing the height of the shrinkage cavity area at the head and the unstable area of ​​the lower molten pool. The arc initiation stage accelerates the melting speed of the consumable electrode, reducing the height of the poorly solidified bottom of the ingot. The helium cooling channel regulates the temperature of the consumable electrode, thereby keeping the voltage, current, melting rate, and number of molten droplets constant, and stabilizing the arc and arc length. The advantages of this invention are: significantly improved top-feeding effect, upward shift or near elimination of the shrinkage cavity area, thereby reducing the amount of cutting and increasing the material yield; reduced cracking of the consumable electrode due to temperature differences, thereby reducing the probability of white spot formation and improving the purity and performance of the material.

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