For intermediate frequency induction furnace using parallel induction melting furnace, the following problems should be noted:
(1) At the beginning of melting, the inductance and capacitance on the line could not be matched properly quickly and the current was unstable, so power supply could only be provided at low power in a short time. Once the current is stable, it should be switched to full load. During the melting process, the capacitance should be adjusted continuously to maintain a high power factor of the equipment. The molten steel is overheated to a certain degree after the full melting of the charge, and then the input power is reduced according to the smelting requirements.
(2) Appropriate melting time should be controlled. Too short melting time will cause difficulties in voltage and capacitance selection, and too long will increase the useless heat loss.
(3) Improper cloth or burden with too much rust will occur “bypass” phenomenon, should be dealt with in a timely manner.” Bypass” so that the upper furnace material can not fall into the molten steel so that the melting stagnation and the bottom of the molten steel overheat easily damaged lining, will also make the liquid steel absorb a lot of gas.
(4) Due to the effect of electromagnetic stirring, the middle part of the liquid steel is uplifted, and the slag often flows to the edge of the crucible and bonds on the furnace wall. Therefore, the slag should be continuously added in the melting process according to the furnace condition.