Vacuum consumable electric arc furnace melting method (referred to as VAR method)
1.1 Advantages of VAR furnace
a. Full coaxial power input, that is to say the complete coaxiality of the entire furnace height, called "coaxial power supply". This method can avoid the magnetic leakage caused by the imbalance of the supply current. Reduce or eliminate the adverse effects of induced magnetic fields on smelted products. And improve the electrical efficiency.
b. With accurate electrode weighing system, the melting rate is automatically controlled to achieve constant speed melting; the advanced electronic control system and weight sensor ensure the constant length of the arc and the melting rate during the melting process, thus controlling the solidification process To effectively prevent segregation.
c. Large-scale, modern VAR furnaces can smelt large ingots with a diameter of 1.5m and a weight of 32t.
1.2 Disadvantages of VAR furnace
a. The preparation of the electrode process is very cumbersome. 2. It is necessary to press the titanium sponge, the intermediate alloy and the return residue into an integral electrode or a single small electrode with an expensive press. The monolithic electrode also needs to be soldered to a consumable electrode. At the same time, in order to ensure the uniformity of the consumable electrode components, it is also necessary to configure corresponding facilities such as cloth, weighing, and mixing.
b. Occasional metallurgical defects such as segregation and inclusion. High-density inclusions and low-density inclusions brought in by raw materials or processes cannot be completely dissolved during the smelting process, resulting in metallurgical