For intermediate frequency induction furnaces using parallel electric furnaces, the following issues should be noted:

(1) At the beginning of melting, because the inductance and capacitance on the line are not quickly matched properly, the current is unstable, so it can only be supplied with low power in a short time. Once the current is stable, it should be transferred to full load power supply. The capacitance should be constantly adjusted during the melting process to maintain a high power factor of the equipment. After full melting of the charge, the molten steel is overheated to a certain extent, and then the input power is reduced according to the smelting requirements.

(2) The proper melting time should be controlled. If the melting time is too short, it will cause difficulties in the selection of voltage and capacitance, and if it is too long, it will increase the unhelpful heat loss.

(3) Improper charge or excessive rust in the charge will occur "bridge" phenomenon, should be dealt with in time. The "bridge" makes the upper part of the non-melting material can not fall into the molten steel, so that the melting stops, and the bottom of the molten steel overheating is easy to damage the lining, but also make the liquid steel absorb a lot of gas.

(4) Due to the effect of electromagnetic stirring, the middle of the liquid steel rises, and the slag often flows to the edge of the crucible and is bonded to the furnace wall, so the slag material should be continuously added according to the furnace condition during the melting process.