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The protection circuit primarily serves to safeguard the intermediate-frequency power supply system. If the protection circuit malfunctions, it can easily cause the intermediate-frequency power supply to fail to operate. Conversely, if a fault occurs but the protection circuit fails to activate, the intermediate-frequency power supply is likely to be damaged.

 

　　1. False operation caused by external interference: When the load changes dramatically and the detection circuit is located close to high-power circuits, interference signals are generated. In a medium-frequency induction furnace made of stainless steel, this can lead to fluctuations in the detected current or voltage values, causing the overcurrent indicator light or overvoltage indicator light to illuminate and triggering the inverter to shut down.

 

　　2. Refusal action: a) The power supply to the detection circuit section is without voltage—for example, due to damage or desoldering of electronic components in the detection circuit. b) Components in the detection circuit are damaged; the wiring of the voltage transformer or current transformer is loose or has come undone.

 

Medium-frequency induction furnace homogenizing annealing (diffusion annealing)

 

Induction Quenching: Homogenizing annealing is a heat treatment process aimed at reducing chemical segregation and microstructural inhomogeneity in metal ingots, castings, or forged billets. It involves heating the material to a high temperature, holding it at that temperature for an extended period, and then allowing it to cool slowly. The schematic diagram illustrates the principle of a medium-frequency induction furnace used for this annealing process, which is specifically designed to achieve uniformity in both chemical composition and microstructure.

 

The heating temperature for homogenizing annealing is typically Ac3 plus (150–200℃), or 1050–1150℃. The holding time in a medium-frequency induction furnace is generally 10–15 hours, ensuring sufficient diffusion to eliminate or reduce compositional and structural inhomogeneities. Since diffusion annealing involves high temperatures and long holding times, which can lead to coarse grain sizes, it is followed by a full annealing or normalizing treatment to refine the microstructure again.

 

During both the initial and subsequent uses of medium-frequency induction furnaces, it is necessary to line the furnace body and then sinter the lining. Furnace linings are classified into acidic and basic types, depending on the raw materials and melting requirements; our plant uses an acidic lining. Lining the furnace involves applying a protective layer—made of materials such as quartz sand—along the inner wall of the furnace to isolate the molten material from the induction coil inside the furnace, thereby protecting the induction coil. When applying the lining, care should be taken to ensure even and firm compaction in one continuous application, forming a single, unified structure. After the lining is completed, it must undergo prolonged low-temperature baking to allow it to solidify into a robust, integral whole with sufficient strength to withstand the impact of molten-metal stirring and charge additions.

 

The Heilongjiang Medium-Frequency Induction Furnace—Weifang Kangda Induction Furnace—Stainless Steel Medium-Frequency Induction Furnace is provided by Weifang Kangda Induction Furnace Co., Ltd. The Heilongjiang Medium-Frequency Induction Furnace—Weifang Kangda Induction Furnace—Stainless Steel Medium-Frequency Induction Furnace is a brand-new, upgraded product launched this year by Weifang Kangda Induction Furnace Co., Ltd. The images above are for reference only. Please call the contact number listed on this page or on the images to reach our contact person: Manager Li.