ENRX induction heating system being lowered for underwater hot‑tap welding in the North Sea

Induction pre-heating

Induction preheating is a process whereby materials or workpieces are heated by induction prior to further processing.

Induction heating explained

NRX induction heater preheating 170 mm anode stubs for smelter operations

What is induction pre-heating?

Induction pre-heating is a process where materials or workpieces are heated by induction prior to further processing. The reasons for pre-heating vary. In the cable and wire industry, cable cores are pre-heated before insulation extrusion. Steels strips are preheated prior to pickling and zinc coating. Induction pre-heating also softens metals before bending, and prepares tubes and pipes for welding. Mobile preheating solutions facilitate onsite repairs of bearing assemblies.

Brochure: Induction heating applications

ENRX medium‑frequency Sinac system preheating seamless offshore pipe before coating

What are the benefits?

Extremely efficient preheating, resulting in major energy savings
Short cycle times and continuous automatic matching means a single coil can handle wide production ranges
Compact and easy to integrate into existing or planned production lines

Helicopter approaching offshore oil platform where ENRX induction heating supports maintenance and repair operations

Where is it used?

Induction pre-heating is employed in the automotive, mechanical, aeronautical, electrotechnical, white goods and shipbuilding industries. A major area of use is pre-heating for welding. Our mobile Minac systems are used in the offshore sector for onsite weld pre-heating. Minac units are also frequently flown to oil platforms and airports to perform repairs and maintenance.

ENRX Sinac induction heating equipment used for preheating components

What equipment is available?

ENRX designs and builds specialized systems for steel strip as well as wire and cable preheating. These systems typically feature our Sinac equipment, and offer horizontal or vertical coil
layout designs. Customized layouts are also available. Mobile and compact ENRX Minac units are used for onsite pre-heating.

Solutions explained

Minac portable induction heating for powerful results

Power meets portability. The ENRX Minac delivers strong, focused induction heat - perfect for heavy-duty repairs, production, and on-site operations. From 6 to 220 kW.
ENRX Ventac: the low weight is a heavy argument

Ventac is our ultra-compact, air-cooled induction heating system—no water, no compromise. It delivers portable, high-precision heating for shrink-fitting, pre-heating and post-heating in demanding industrial environments.
Sinac: built for performance

ENRX Sinac delivers high-frequency, high-precision induction heating for continuous operations. Built to heat, built to last. Even in the most demanding environments.
Smarter service with IoT

ENRX induction systems are IoT-ready—enabling remote diagnostics, fine-tuning, and predictive maintenance. Smarter service, better uptime, and long-term reliability.
Service beyond installation

ENRX provides continuous support through coils, parts, maintenance and flexible service renting - ensuring maximum performance and uptime for your induction systems.
Lab-tested heating performance

From simulation to reality. Our lab engineers test every heating setup to ensure reliable results—tailored to your parts, process and performance goals.

A closer look at how it works

Ventac is ideal for preheating before and during welding
Ventac is a portable air-cooled induction heating system, Here equipped with a quick wrap heating blanket for preheating jobs.
An operator replaces a bearing that has been heated with an ENRX mobile Minac system
ENRX systems have been used for hot tap welding on the bed of the North Sea: Photo: Technip Norge AS.
Specialist coils being tested for the Tampen subsea hot tapping procjet. Photo: Technip Norge AS
An medium-frequency ENRX Sinac pre-heats seamless offshore pipe prior to coating.
No dust, no fumes, no noise. An ENRX heater gets to grips with 170 mm anode stubs.
Induction heating is increasingly used to remove the giant nuts and bolts in power stations’ turbines.
ENRX designs and builds specialised systems for steel strip and wire and cable pre-heating.
Minac units are frequently flown to oil platforms to perform repairs and maintenance.
The “Safe Concordia” accommodation and support platform. A mobile ENRX Minac system was used to pre-heat the weld area during the welding of a patch onto a crane tower.
An example of induction pre-heating: the pipe is being heated prior to receiving an anti-corrosive coating.
An induction coil specially designed and built for offshore industry requirements. Once heated by the coil (in red) the pipe can receive an anti-corrosion covering.
Preheating before welding of baseplate
Preheating before welding of tower rings