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EFD Induction has the most comprehensive range of solutions for the tube and pipe industry. Weldac is a proven solution for welding stainless steel, aluminum, low-carbon steel and high-strength steel and is possibly the world's best induction welder.

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High-output solid-state welders

More output: Continuous electronic load matching secures full power output across a wide range of tube sizes.

More uptime: Short-circuit-proof, safe and reliable operation.

Unrivalled efficiency: Diode rectifier with a constant power factor of 0.95 at all power levels, and an efficiency factor of 85-87%.

Eco and energy friendly: High efficiency saves energy and reduces cooling water consumption.

Easy to operate: An easy-to-use control panel with a minimum of manual settings makes the Weldac extremely easy to operate.

Wide range of power sizes: From 50 kW up to 2200 kW. A frequency range of 60-500 kHz.

Modern modular design: The small, compact footprint saves valuable floor-space and simplifies in-line integration. Up to 1100 kW available in a one-cabinet solution.

Complete system: Consisting of a diode rectifier, inverter modules, output section, busbar and operator control system.

Unmatched warranty: Five-year warranty on Weldac inverter modules and driver cards.

Full range of consumables: Coils, ferrite, impeders and tube scarfing equipment.

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Induction heating for tube and pipe welding

Weldac - High-output, solid-state welders

Weldac is EFD Induction’s family of high-output, solid-state tube and pipe welders. The Weldac family covers a wide range of power sizes; from 50 kW up to 2200 kW. and a frequency range of 60-500 kHz.

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Induction welding

Induction welding is used in the tube and pipe industry for the longitudinal welding of stainless steel (magnetic and non-magnetic), aluminum, low-carbon and high-strength low-alloy (HSLA) steels and many other conductive materials.

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Tube and pipe welding with induction heating

The first welder in the world with 1000 kW in a single cabinet solution. EFD Induction has always been at the forefront in developing equipment with the best power-to-volume ratio.

Double cabinet welder. The Weldac family covers a wide range of power sizes—from 50 kW up to 2200 kW.

Induction heating - tube and pipe welding

Coil changes take only seconds, with the frequency adjusting automatically to each tube dimension.

Weldac’s automatic load matching ensures full output power across a wide range of tube sizes. There are no ‘unsafe’ operating areas. When a different- sized coil is fitted, Weldac automatically matches to the best setting.

Automated induction longitudinal welding is a reliable, high-throughput process

Weldac’s efficiency from input at the rectifier to output at the coil is 85-87%.

Weldac can be fitted with various induction coils or with quick-lifting contact heads.

The low power consumption and high efficiency of EFD Induction welding systems reduce costs.

The high-speed throughput and reliability of induction welding makes it perfect for the tube and pipe industry.

Ferrite for high-frequency tube welding

We offer a full range of consumables including coils, ferrite, impeders and tube scarfing equipment.

Technical Articles

Maximising output in high-frequency tube and pipe welding

The authors evaluate the parameters that influence welder performance and scrap production during changeover in the high-frequency tube and pipe welding process.

Maximizing uptime in high-frequency tube and-pipe welding

This article explains some basic principles of solid-state welder design that are crucial for maintaining operation under various conditions.

New high-frequency converter for induction heating

This paper presents a new high-frequency-converter for induction heating. The converter has a diode rectifier and automatic matching.

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

The article investigates the impact that geometrical changes in the weld zone have on weld frequency and the Heat Affected Zone (HAZ).

News

EFD Induction Weldac chosen for 16 inch mill

For SSAB Europe, the key factors for choosing an EFD Induction tube welder were smaller footprint, new advanced technology with a five-year guarantee on inverter modules and a high-power factor at any welder power level.

Marcegaglia UK Ltd reports excellent performance from EFD Induction WELDAC

In August 2017, Marcegaglia UK installed a new EFD Induction 400kW WELDAC high frequency tube welding system on the largest pipe mill at their UK Dudley plant.

Tata Steel invests in EFD Induction Weldacs across European plants

The excellent reliability, efficiency and robustness of the EFD Induction Weldacs make these solid-state tube welders a solid investment indeed.

Introducing SiC transistors

“After comprehensive testing of a range of different types of transistors, EFD Induction is now ready to introduce Silicon Carbide transistors in some of our high frequency, solid-state welders”, says Global Sales Director for Tube and Pipe, Peter Runeborg.

Welder upgrade improves total harmonic distortion

EFD Induction has announced that its lower-power Weldac welders will feature an option for a 12-pulse diode rectifier.

Major European pipe maker orders 750 kW ‘Weldac’

One of the largest tube and pipe manufacturers in Europe has selected EFD Induction to design, build and install a single-cabinet 750 kW / 200 kHz ‘Weldac’welder.

Weldac impresses at Chinese event

Dozens of high-level representatives from China’s tube and pipe industry recently attended a special technical seminar hosted by EFD Induction in Shanghai.

Declaration of Independence

Independence Tube Corporation (ITC) is one of North America’s leading manufacturers of square and rectangular structural steel tubing.

Big machine, big success

Shanghai-based Baoshan Iron & Steel Company Ltd. is China’s largest iron and steel manufacturer. The recent installation of an IGBT-based Weldac and two seam annealing machines enables them to produce a complete range of tubes.

Weldac: Tube welders