About EFD InductionCareersSitemapPrint page • Choose language:
Preheating with induction

Preheating with induction

EFD Induction is present in a series of industries for preheating—primarily the automotive, cable and wire, electrotechnical, and tube and pipe industries. In many cases, our preheating solutions are integrated into production lines.


Using induction rather than gas or a furnace for preheating has several advantages. Heat transfer is direct—minimizing heat loss and energy consumption while increasing the production rate and improving quality.


The heat can also be controlled precisely. This makes it possible to reduce the temperature when welding and then achieve a lower cooling rate. Less risk of cold cracking and excessive hardening are some of the benefits.


And you can forget heat-spreading flames. You get a better working environment, less need for cooling and a lower fire risk.



Mobile heat generators

Minac - Mobile heat generators



Wide range of applications.

Brazing, shrink fitting, hardening, curing, straightening, heat treatment, etc.



Suitable for heating all kinds of electrically conductive materials like copper, aluminum, steel, stainless steel, brass, titanium, etc.


Twin power output.

Many models come in a Twin version featuring two independent power outputs that can operate simultaneously.


Mobile induction.

You can move it around a workshop or factory floor. Can be loaded into a car or van and transported to work sites.


Complete range.

Available with maximum intermittent output power of 10-220 kW (6-140 kW continuous) and a frequency range of 10-280 kHz.




To learn more about Minac please download the brochure or contact your nearest EFD Induction office.
  Minac - Mobile heat generators
Sinac - Universal heat generators


Universal heat generators


Choosing Sinac gives you more than the market's most advanced, most reliable induction heating systems. You also get easy access to EFD Induction’s global service, training and spare parts network. This network—which is made up of manufacturing plants, service centers and local representatives—means you are never far from qualified help and support.  


Opting for Sinac also ensures you get the best possible solution tailored to your specific needs and conditions. Prior to designing your system, our engineers, metallurgists and material experts assess your requirements. Testing and computer simulation at our labs guarantee you receive equipment which is optimized to your applications and which can be painlessly integrated into existing production lines and processes.  





To learn more about Sinac please download the brochure or contact your nearest EFD Induction office. 
  Sinac Universal heat generators


HeatLine Melting and forging equipment


Industrial heat processing systems


HeatLine is EFD Induction’s family of systems for melting and forging applications. A comprehensive range, HeatLine systems feature serial and/or parallel compensated induction power sources for a wide range of output powers and frequencies.


HeatLine’s serial technology is built around robust, high-uptime IGBT transistors. Our parallel technology features thyristor, IGBT and MOSFET components. Each HeatLine converter offers automatic load matching, a single microprocessor-based control board and integrated capacitors.


In addition to systems for melting and forging, HeatLine offers solutions for graphite coating, wire and strip heating, spring wire rolling, glass melting, graphite susceptor heating, galvanizing, food and chemical vessel heating, and other special applications.





To learn more about HeatLine please download the brochure or contact your nearest EFD Induction office. 
  Heatline Induction Melting and Forging Equipment

Induction coils

Having the right coil—and keeping it in the best possible condition—is critical to the efficiency of your induction solution. After all, the coil is the component that actually delivers the heat to the workpiece.


Our induction coil services cover all your coil needs: from coil design through to coil manufacture, installation, maintenance, repair and replacement.


Coil design

Correct coil design is essential to cost-effective induction heating. This service ensures you get design customized to your heating applications and materials. Which, in turn, means that you get the right heating patterns and your induction heating power supply delivers maximum output. You can use the service when introduction induction heating for the first time, or when upgrading existing coils. 


Coil database

Each EFD Induction coil is documented in a database containing all essential information. This makes it quick and easy for us to repair and replace your coils with constant quality. You can use the service when introducing induction heating for the first time, or when upgrading existing coils.


Click to download the brochure:







Induction preheating in the automotive industry

Induction preheating is ideal for reducing the risk of cracking and hardening structures. The reason is that induction generates heat in the material itself, which means that the surrounding temperature is lower than the one generated in the material. This heat is also more accurately controlled than a gas flame. This makes it possible to reduce the temperature difference in the welding zone and achieve a lower cooling rate—particularly important with laser beam welding, where the heat is focused on one single welding point.


What’s more, preheating and welding can occur simultaneously with induction-assisted laser beam welding. You can speed up production without jeopardizing the quality.


Another area of preheating where EFD Induction operates is the shrink fitting of gear wheels. Here again the advantages of induction heating are clear—fast, accurate and controllable heat. The induction equipment is also easy to fit into your existing production line.

Induction preheating the cable and wire industry

EFD Induction supplies numerous preheating solutions for the cable and wire industry. Heating before the extruder is the most common induction application in a cable production line. Using the preheater will decrease the cross-linking time and enable a faster line speed.


Preheating with induction instead of with a conventional method directly transfers the heat to the wire or the cable core. The material is heated to the right temperature in a very short time (exactly how short depends on the line speed and the coil length).  


Induction also means that the actual hardening process begins at the core. The result is better insulation with lower porosity.

Induction preheating in the electrotechnical industry

EFD Induction offers induction equipment, which performs a variety of preheating tasks within the electrotechnical industry. Some examples are induction preheating of axles and frames before welding, and heat softening of bars before bending. 


The purpose of preheating is to reduce the risk of cracking and hardening structures. Induction allows accurate heat control—time and time again. You get exactly the result you require. What’s more, the heat is generated directly in the material, which allows you to speed up the preheating process.

Induction preheating in the tube and pipe industry

Induction produces quick, accurate, controllable and repeatable heat. This makes it an excellent method for preheating tubes and pipes to prevent cracking, reduce hardening structures and increase welding speed.


EFD Induction offers a series of solutions for induction preheating within tube and pipe. Some examples are heating prior to welding, tin remelting, galvanizing, pipe forming and bending, and application of plastic powder or paint to tube.


You can also use induction preheating  to get better adhesion of insulation round heating pipes (compare with the process of adhering insulation round cables and wires).





ArcelorMittal Fontaine chooses EFD Induction

Bolt heating on a steam turbine

Induction heating of wire ends

Preheating of turbine

Induction forging of axel shafts

Induction pre-heating of wire

Welding copper and steel together with induction

Induction preheat the wire ends prior to coating

Pre-heating of pipes before welding

Induction heaters for heating the stubs on anode rods

Induction heating of bearing

Pre-heating of stabilizer bar ends

Induction pre-heating of tube