Frequently Asked Questions

Induction heating is an advanced process that uses electromagnetic energy to heat electrically conductive materials. There is no physical contact between the heat source and the workpiece; heat is generated directly within the material itself.

Compared with conventional methods such as gas furnaces or direct resistance heating, induction provides rapid, energy-efficient, clean and precisely controllable heating. It is therefore particularly well suited to processes requiring high heating rates, accurate temperature control and highly localised heat input.

An induction heating system generally comprises an alternating-current power supply, an induction coil and the workpiece to be heated.

• When alternating current flows through the coil, it generates a rapidly changing magnetic field around it.
• When a conductive metal is exposed to this field, eddy currents are induced within the workpiece.
• The electrical resistance of the material converts these induced currents into heat. In ferromagnetic materials such as iron and steel, magnetic hysteresis can also contribute additional heating.

In induction heating, frequency is one of the principal parameters governing how strongly induced current is concentrated near the workpiece surface. As frequency increases, the skin effect becomes more pronounced and the induced current is concentrated closer to the surface. As frequency decreases, electromagnetic penetration depth increases.

High frequency, ince ve yüzeye yakın bir ısıtma tabakası gerektiğinde avantajlıdır. Küçük çaplı parçalar, dişli dişleri, ince yüzeyler ve lokal sertleştirme uygulamalarında daha hassas bir ısı dağılımı sağlayabilir.

Medium frequency enables electromagnetic energy to penetrate more deeply. It may therefore be preferred for larger-diameter shafts, thicker sections and applications requiring a greater hardening depth.

Hardening depth, however, is not determined by frequency alone. Electrical resistivity and magnetic permeability, workpiece diameter and geometry, coil-to-workpiece coupling distance, power density, heating time and quenching conditions all influence the final result. Moreover, once steel exceeds its Curie temperature, its magnetic properties change, which in turn alters electromagnetic penetration behaviour.

For this reason, it is technically misleading to assign a fixed millimetre value to either high or medium frequency. The appropriate operating frequency must be selected by evaluating the material, workpiece geometry and required hardening depth as an integrated process.

• High energy efficiency. Because heat is generated directly within the workpiece, thermal losses can be substantially lower than with processes that transfer heat from an external source. Induction systems can achieve efficiencies of approximately 87%.
• Speed. High temperatures can be reached within very short cycle times. Heating starts and stops almost instantaneously, making the process particularly suitable for automated production lines.
• Process control. The heated zone can be engineered through coil design, operating frequency and process parameters. Energy is concentrated where it is required, minimising unnecessary thermal exposure of adjacent regions.

Induction technology can be applied to a wide range of processes requiring rapid, contactless, localised and controllable heating of electrically conductive materials. Its industrial use extends far beyond surface hardening.

• Heat treatment and surface hardening: Surface hardening of gears, shafts, crankshafts, bearing components and sprockets, as well as annealing, tempering and stress-relieving operations.
• Metal melting and foundry applications: Controlled melting of steel, cast iron, aluminium, copper, brass and other metals.
• Forging and hot forming: Rapid and uniform heating of billets, bars and other metal components prior to pressing, forging or hot-forming operations.
• Brazing and soldering: Precise and repeatable joining of pipes, electrical connections, heat exchangers, automotive components and HVAC assemblies.
• Pipe and tube welding: Support for high-speed welding processes through controlled localised heating on continuous production lines.
• Shrink fitting: Controlled thermal expansion of one component to facilitate assembly with another, producing a tight mechanical interference fit after cooling.
• Coating, bonding and surface processes: Coating, bonding and related manufacturing processes requiring accurately controlled heating of a defined area.
• Bespoke induction machinery: Sheet-metal forming, can and lacquer curing, portable heating and process-specific automation applications.

These capabilities allow induction technology to be integrated into automated production lines and component-specific processes across the automotive, machinery, forging, foundry, pipe and profile, aerospace and heavy-industry sectors.

The workpiece surface is rapidly heated by induction and immediately quenched. This produces a hardened, wear-resistant surface while the localised nature of the process allows the core to retain much of its original toughness.

Components such as gears, shafts, crankshafts, bearing parts and sprockets can be rapidly heated at the surface and quenched to achieve the required hardened case. Examples of our work can be viewed on the main website.

We provide surface-hardening services using both medium- and high-frequency induction systems. The appropriate system is selected according to the workpiece geometry, material and required case depth.

Yes. Following surface hardening, components are subjected to laboratory verification so that the achieved result can be confirmed against the specified process requirements.

Hardening can leave significant residual stresses in a component. Tempering is used to reduce these stresses and can also be employed to adjust hardness to the required intermediate level. Temperature and holding time are selected according to the material and target mechanical properties.

We design and manufacture medium- and high-frequency induction heating systems. Each heating concept is engineered around the customer’s process requirements, with coil geometry, power delivery and operating parameters developed to preserve the inherent efficiency and controllability of induction heating.

Yes. We design and manufacture copper inductors with magnetic flux concentrators to suit the application. Correctly engineered flux concentration can improve field control and help maintain high system efficiency.

We also develop three-dimensional quench-head geometries engineered for reliable operation in demanding high-temperature environments.

Yes. Our equipment is available for short- and medium-term rental requirements and can, where required, be supplied together with technical consultancy and application-specific inductor design.

We have more than 25 years of experience in induction technology and have manufactured approximately 1,000 bespoke machines developed around customer-specific production requirements.

Simply contact us via WhatsApp. To enable an efficient technical assessment, please include:

• Material grade, if known
• Workpiece dimensions and quantity
• Required hardness and the area to be hardened
• A photograph or technical drawing of the component

We can continue the technical assessment and quotation within the same conversation. You may also call us on +90 533 603 00 37.