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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






Welding with induction heating

All our welders have rugged, independent full-bridge IGBT transistors. These transistors are virtually short-circuit proof, considerably boosting reliability and uptime.


You also get more output thanks to our continuous electronic load matching. This secures full power output across a wide range of tube sizes (OD 3/8”-26”/10mm-600 mm), ensuring maximum welding speed for each size.


Moreover, you can reduce your power consumption. The efficiency from input at the rectifier to output at the coil is, at least 85-87 percent. And the use of diode rectifiers results in a high, constant power factor (0.95) at all power levels—thereby eliminating the need for costly reactive power compensation capacitors.


Click to read the brochure


Weldac Solid-State-Welders







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 







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

New HF converter for induction heating

Factors influencing heavy wall tube welding

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

Temperature Evaluation of Weld Vee Geometry and Performance

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

New additions to the Weldac range

Weldac impresses at Chinese event

Maximized uptime and throughput from the EFD Induction Weldac

Visit us at FABTECH

Baoshan installs IGBT-based Weldac and two seam annealing machines

Induction welders for large mills

Replacment of oscillator-type welder

Independence Tube Corporation buys 1,200 kW welder

EFD Induction Weldacs supplied to Tubecon

On-site upgrade to single-cabinet welder

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

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