ENRX is part of Arendals Fossekompani’s portfolio within the energy transition. The company’s induction heating technology is used in automotive, wind energy, electronics, cable, mechanical engineering and tube and pipe production.
In tube and pipe production, ENRX’s best-known systems are the Weldac family of high-frequency induction welders, which are used to join the seam on tubes as they come through the production line. The newest generation, the Weldac 03, is set to be delivered to new and existing customers from January 2027.
To understand the technology and what it means for production in vehicle structures, furniture, scaffolding, construction, industrial machinery and equipment, Arendals Fossekompani sat down with Morten Lavergren, Section Manager for InLine Heating at ENRX. Morten has a background in electric power technology, has worked at ENRX and its predecessors for 32 years, and has been a key member of the development team behind the Weldac.
Heat and force
So, what exactly does the Weldac do? Morten explains it simply.
“It’s a form of welding that uses both heat and force,” he says. “You start with a flat strip of metal and bend it into a tube, which gives you a weld point. The newly rolled metal is then heated to 1,250 degrees, and the edges are then pressed together.”
The process is continuous, not done piece by piece. “The strip can be several hundred metres long, and you press it together as it runs through,” says Morten.
Within the industry, this is known as high-frequency welding. No single welder can fit the demands of every job, which is why ENRX built a family of products to ensure customers' needs are met.
“It comes down to physics and how much power it can deliver, relative to what you’re producing,” says Morten.
Weldac systems range from 50 kW to 2,200 kW, with frequencies of up to 500 kHz. The systems are built to maximise uptime, ensure consistent weld quality, and reduce operating costs in demanding industrial environments. The Weldac 03 is the smallest member of the family, covering 50–150 kW.
What changes on the factory floor
Tube welding runs continuously and uses a lot of power, so every percentage point of efficiency counts. The Weldac 03 combines energy efficiency, compact design and intelligent operation, helping tube manufacturers produce more efficiently while reducing energy losses. The Weldac 03 was designed for tight tube mill layouts, retrofit projects and line upgrades, helping manufacturers make better use of the space they have.
“The first thing people notice about the Weldac 03 is how small and lightweight it is,” says Morten. “That makes it easier to install and fit into place.”
The numbers back this up
The Weldac 03 delivers:
- Up to 92% overall system efficiency in prototype testing, meaning more of the power drawn from the grid goes into the weld and less is lost along the way.
- Up to 40% smaller footprint than previous solutions, which frees up space on the factory floor and makes installation simpler.
- Automatic frequency adjustment and electronic load matching, so the welder adapts to the tube being produced instead of relying on manual tuning.
According to Morten, the result is fewer faults and consistently high weld quality.
What’s next
Welded tubes and pipes are everywhere. They’re a necessary part of infrastructure that is easy to look past as long as they work.
According to the International Tube Association,[AE2] global tube and pipe production reached an estimated 182 million tonnes in 2025. Around three-quarters of this production consisted of welded tubes and pipes.
When questioned about the market and future uses of the Weldac 03 and the other systems within its family, Morten projects a change in the market, with demand for new materials, new shapes, and higher speeds.
“Boron steel and aluminum are two new areas of focus. These are very present in electric cars, and that is a growing industry,” he says. “It’s a very exciting time for tube production.”
Beyond round tubes, ENRX also expects more demand for profiles: shaped sections used in vehicle frames, for example. “New materials, new shapes and a need to produce faster: that’s what high-frequency welding is built for,” says Morten.
About ENRX:
Leveraging decades of experience, ENRX is a global leader in industrial induction heating solutions, serving industries including automotive, tube and pipe, renewable energy, electrotechnical appliances and HVAC. ENRX’s solutions help customers improve efficiency and precision while reducing energy consumption.
