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Induction heating for the tube and pipe industry

EFD Induction is very well known within the Tube and Pipe industry. Our Weldac family of welders confirms our leading position as a provider of cost-effective, high-uptime systems.

 Some of the areas where we supply solutions are:

  • Seam annealing of longitudinal tube welds
  • Full body annealing of both magnetic and non-magnetic tube products 
  • Preheating and postheating of various workpieces
  • Longitudinal seam welding of tubes and pipes in dimensions from OD 3/8”-26”/10 mm –  660 mm 







Induction welding

Induction welding for the tube and pipe industry

Induction heating is a proven solution for welding stainless steel, aluminum, low-carbon and high-strength steel.


You can handle dimensions all the way from OD 3/8”-26”/10 mm–660 mm. This is possible because EFD Induction is the only induction heating supplier that can deliver power output of up to 2 MW.


Our range of solid-state welders is called Weldac, and you can choose from two basic designs: one-cabinet for low-power welders; two-cabinet for high-power welders. Modular design with independent full-bridge IGBT inverters makes Weldac compact, saving valuable floor space and simplifying in-line integration and retrofitting. Weldac can be fitted with induction coils and/or contact heads.

Wyżarzanie indukcyjne

Tube and Pipe Annealing

EFD Induction has developed a range of full body and seam annealing systems to meet your specific requirements. Common areas are annealing of high-grade steels and pipes produced according to different specifications such as API.


There are many advantages to choosing EFD Induction for tube and pipe annealing. These include: a constant power factor at all power levels, quick lifting of coils to avoid damage, continuous electronic automatic load matching, no need for operator intervention when changing tube size or wall thickness.


Within seam annealing there are two more smart EFD Induction solutions worth looking at in more detail: Traveling seam annealing and orbital seam annealing.


Traveling seam annealing moves the induction coils horizontally across the seam of the pipe seam. This ensures a uniform temperature all the way out to the ends of the pipes, thus minimizing waste.


With orbital seam tracking, an optical camera ensures constant heating of the weld. The camera simply follows the seam along a white tracking line painted on the pipe, and compensates for positional changes by rotating the induction coils (+/- 15°).


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).





Induction postheating in the tube and pipe industry

Induction postheating is used in the tube and pipe industry  to eliminate hardening structures, which may have arisen after welding. New steel quality guidelines, in particular APT, often demand reheating after welding.


Thanks to the accuracy and controllability of heat induction, it is possible to increase precision in postheating. This, in turn, produces pipes that are more durable, more resistant to cracks and less susceptible to corrosion.


High-output solid-state welders

Weldac - High-output solid-state welders


The Weldac is EFD Induction's family of high-output solid-state welders. A complete system, the Weldac consists of a frequency converter, output matching section, busbar, external control system and coil connection.


The Weldac system is available in two basic designs: single-cabinet for welders up to 1000 kW; double-cabinet for welders up to 2200 kW. Weldac is a proven solution for welding stainless steel, aluminum, low-carbon steel and high-strength steel.


Modular design with independent IGBT inverters makes Weldac compact, saving valuable floor space and simplifying in-line integration and retrofitting. The Weldac system can be fitted with induction coils or contact welding heads.










To learn more about HardLine please download the brochure or contact your nearest EFD Induction office. 
  Weldac Solid-State-Welders






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:







Exclusive report - The EFD Induction Weldac

Weld setup, variable frequency and heat affected zones in high-frequency tube and pipe welding

Maximising output in high-frequency tube and pipe welding

Maximizing uptime in high-frequency tube and pipe welding

Consistent quality in high-frequency tube and pipe welding

Introducing a control solution for weld seam normalizing

Optimization of seam annealing process with the help of 2D simulations

Factors influencing heavy wall tube welding

Induction heating of live pipeline for hyberbaric diver welding

New HF converter for induction heating

Temperature Evaluation of Weld Vee Geometry and Performance

Computation and analysis of temperature distribution in the cross-section of the weld Vee

EFD Induction boosts welding frequency up to 500 kHz with IGBT transistors

New additions to the Weldac range

Weldac impresses at Chinese event

On-site upgrade to single-cabinet welder

Replacment of oscillator-type welder

EFD Induction Weldacs supplied to Tubecon

Maximized uptime and throughput from the EFD Induction Weldac

Seam Annealing with Horizontal Tracking

Induction pre-heating of tube

Independence Tube Corporation buys 1,200 kW welder

Induction welders for large mills

Baoshan installs IGBT-based Weldac and two seam annealing machines

Visit us at FABTECH

Record-breaking weekly sales of Induction Welders

Introducing SiC transistors

Largest single-cabinet welder produced by EFD Induction

Welder upgrade improves THDI

EFD Induction acquires Superior Technologies Europe

Giant tube and pipe maker orders a giant induction welder

Roll forming equipment maker orders two solid-state induction welders

Post weld heat treatment delivery

Peter Runeborg new Sales and Service Manager at EFD Induction Norway

New welding Sales Manager at EFD Induction Norway

EFD Induction acquires Electronic Heating Equipment, Inc.

New additions to the Weldac range

EFD Induction to show new low-power welder at Tube Düsseldorf

Calsonic Kansei chooses new welder from EFD Induction

EFD Induction to unveil new Weldac range at Fabtech

Satisfied Weldac customer

Fabulous week at Tube 2018

Industrial evolution at Fabtech 2017

Scarfing systems and welding consumables

Profile welding