Weldac: Tube welders
High-output induction welding systems for tube and pipe production
Weldac® is ENRX’s family of high-output solid-state induction welders, designed for continuous tube and pipe production. It delivers reliable, high-efficiency longitudinal welding across a wide range of materials, production speeds, and tube dimensions.
With a power range from 50 kW to 2,200 kW and frequencies up to 500 kHz, Weldac systems are built to maximize uptime, ensure consistent weld quality, and reduce operating costs in demanding industrial environments.
Why choose Weldac
- High-output welding up to 2.2 MW
- Consistent weld quality through automatic load matching
- Compact modular design for easy integration or retrofit
- High efficiency up to 92%, reducing energy consumption
- Minimal operator intervention for higher productivity
- Proven reliability with 5-year warranty on key components
Built for modern tube and pipe production
Weldac systems are developed specifically for the tube and pipe industry, where continuous operation, high throughput, and consistent quality are critical.
They are used for:
- Carbon steel tube production
- Stainless steel and high-strength steel tubes
- Aluminium tube applications
- High-speed industrial tube mills
The system automatically adjusts to different tube sizes, ensuring full output power without manual tuning. This enables stable production and maximum welding speed across changing production conditions.
Maximum uptime. Minimum intervention.
Weldac is engineered to keep production running.
- Automatic load matching ensures optimal power output across all tube sizes
- Short-circuit-proof design enables safe and reliable operation
- Quick coil changes reduce downtime to seconds
- Simple operator interface minimizes manual adjustments
This combination reduces operator error while increasing throughput and overall production efficiency.
Compact design. High performance.
Weldac delivers high power density in a compact footprint.
- Single-cabinet solutions up to 1,100 kW
- Multi-cabinet systems up to 2,200 kW
- Modular architecture for flexible configuration
- Easy integration into new or existing tube mills
The compact design saves valuable floor space and simplifies installation or retrofitting into production lines.
Technichal data
|
Model |
Weldac 03 |
|
Supply voltage range |
3 x 480 V / 3 x 550 V |
|
Mains supply frequency |
50/60 Hz |
|
Displacement factor (cosrp) |
>0.95 |
|
Nominal output power (up to) |
150 kW |
|
Frequency range |
100-500kHz |
|
Efficiency |
92% |
|
Cooling water ΔP (in/out), min |
4,5 bar |
|
Cooling water pressure, max |
6 bar |
|
Cooling water inlet temp., max |
+35 °C |
|
Ambient operating temperature |
+5 °C - +50 °C |
|
Enclosure protection category |
IP 54 |
|
Dimension (LxWxH) |
1200 x 475 x 970 mm |
| Cabinets | 1 |
|
Colour |
RAL 7021, Black Grey |
Subject to modification
|
Model |
Weldac 04 |
|
Supply voltage range |
3 x 480 V / 3 x 550 V |
|
Mains supply frequency |
50/60 Hz |
|
Displacement factor (cosrp) |
>0.95 |
|
Nominal output power (up to) |
300 kW |
|
Frequency range |
100-500kHz |
|
Efficiency |
91% |
|
Cooling water ΔP (in/out), min |
4,5 bar |
|
Cooling water pressure, max |
6 bar |
|
Cooling water inlet temp., max |
+35 °C |
|
Ambient operating temperature |
+5 °C - +50 °C |
|
Enclosure protection category |
IP 54 |
|
Dimension (LxWxH) |
1500 x 500 x 1256 mm |
| Cabinets | 1 |
|
Colour |
RAL 7021, Black Grey |
Subject to modification
|
Model |
Weldac 06 |
|
Supply voltage range |
3 x 480 V / 3 x 530 V |
|
Mains supply frequency |
50/60 Hz |
|
Displacement factor (cosrp) |
>0.95 |
|
Nominal output power (up to) |
550 kW |
|
Frequency range |
100-500kHz |
|
Efficiency |
91% |
|
Cooling water ΔP (in/out), min |
4,5 bar |
|
Cooling water pressure, max |
6 bar |
|
Cooling water inlet temp., max |
+35 °C |
|
Ambient operating temperature |
+5 °C - +50 °C |
|
Enclosure protection category |
IP 54 |
|
Dimension (LxWxH) |
2235 x 608 x 2110 mm |
| Cabinets | 1 |
|
Colour |
RAL 7021, Black Grey |
Subject to modification
|
Model |
Weldac 08 |
|
Supply voltage range |
3 x 480 V / 3 x 530 V |
|
Mains supply frequency |
50/60 Hz |
|
Displacement factor (cosrp) |
>0.95 |
|
Nominal output power (up to) |
1100 kW |
|
Frequency range |
100-500kHz |
|
Efficiency |
91% |
|
Cooling water ΔP (in/out), min |
4,5 bar |
|
Cooling water pressure, max |
6 bar |
|
Cooling water inlet temp., max |
+35 °C |
|
Ambient operating temperature |
+5 °C - +50 °C |
|
Enclosure protection category |
IP 54 |
|
Dimension (LxWxH) |
2450 x 700 x 2200 mm |
| Cabinets | 1 |
|
Colour |
RAL 7021, Black Grey |
Subject to modification
|
Model |
Weldac 11 |
|
Supply voltage range |
3 x 480 V / 3 x 530 V |
|
Mains supply frequency |
50/60 Hz |
|
Displacement factor (cosrp) |
>0.95 |
|
Nominal output power (up to) |
1200kW |
|
Frequency range |
90-500kHz |
|
Efficiency |
91% |
|
Cooling water ΔP (in/out), min |
4,5 bar |
|
Cooling water pressure, max |
6 bar |
|
Cooling water inlet temp., max |
+35 °C |
|
Ambient operating temperature |
+5 °C - +50 °C |
|
Enclosure protection category |
IP 54 |
|
Dimension (LxWxH) |
2450 x 700 x 2200 mm |
| Cabinets | 2 |
|
Colour |
RAL 7021, Black Grey |
Subject to modification
|
Model |
Weldac 22 |
|
Supply voltage range |
3 x 480 V / 3 x 530 V |
|
Mains supply frequency |
50/60 Hz |
|
Displacement factor (cosrp) |
>0.95 |
|
Nominal output power (up to) |
2200 kW |
|
Frequency range |
90-500kHz |
|
Efficiency |
91% |
|
Cooling water ΔP (in/out), min |
4,5 bar |
|
Cooling water pressure, max |
6 bar |
|
Cooling water inlet temp., max |
+35 °C |
|
Ambient operating temperature |
+5 °C - +50 °C |
|
Enclosure protection category |
IP 54 |
|
Dimension (LxWxH) |
3533 x 800 x 2544 mm |
| Cabinets | 2 |
|
Colour |
RAL 7021, Black Grey |
Subject to modification
Energy-efficient and cost-effective
Energy efficiency is a key advantage of Weldac systems.
- Efficiency up to 92% from input to coil
- Constant high power factor (~0.95) across all power levels
- Reduced cooling water consumption
- Lower operating and energy costs
This results in a more sustainable production process with reduced total cost of ownership.
Complete system offering
Weldac is delivered as a complete system, including:
- Diode rectifier
- Inverter modules (SiC or IGBT technology)
- Output section and busbar
- Operator control system
A full range of consumables and accessories is available, including coils, ferrite, impeders and tube scarfing equipment.
Complementary solutions such as seam normalising systems are also available for complete tube processing. This ensures full compatibility and optimal performance across the entire welding process.
Designed for long-term performance
Weldac systems are built for durability and future-ready operation:
- Robust design for demanding industrial environments
- Five-year warranty on inverter modules and driver cards
- Ready for Industry 4.0 connectivity and integration
- Supports monitoring, automation, and predictive maintenance
New: Weldac 03
Need Weldac performance in a smaller footprint? Weldac 03 is the compact new member of the Weldac family, designed for tube mills with limited floor space, retrofit projects and line upgrades.
Insights and resources
Download brochures and expert materials on induction heating technologies and their industrial applications.
Weldac® I High-output solid-state welders
Weldac is a complete offering with a diode rectifier, inverter modules, output section, busbar and operator control system. You can also access a full range of consumables including coils, ferrite, impeders and tube scarfing equipment. We also supply seam normalising solutions.
Weldac® 03 | Ultra-Compact Induction Tube & Pipe Welder
Weldac 03 from ENRX is an ultra-compact induction welding system designed for tube and pipe production. With a footprint up to 40% smaller than Weldac 04, high energy efficiency, and reliable performance, it is ideal for line upgrades and space-constrained installations.
Induction heating applications | Processes, equipment and benefits
Discover how ENRX induction heating improves efficiency, precision, and sustainability across industrial applications — from brazing and bonding to forging and annealing. Learn about the processes, equipment, and benefits of modern induction technology.
Tube Welding Consumables
Explore ENRX’s Tube Welding Consumables brochure, offering high-quality induction welding coils, impeder guides, spare parts, and accessories designed to ensure reliability, efficiency, and long service life in tube and pipe production.
Explore the Weldac family in 3D
Customer stories and experience
Real-world projects, proven solutions, and industrial expertise in action
Marcegaglia expands steel production with ENRX Weldac induction welding systems
Marcegaglia strengthens its production capacity with a new order of ENRX Weldac systems, gaining higher efficiency, reliable uptime, and consistent weld quality in demanding steel processing operations.
How Marcegaglia improves energy efficiency with ENRX induction welding technology
Marcegaglia invests in advanced ENRX equipment to reduce energy consumption and improve production efficiency, reinforcing a long-term strategy built on high-performance and low-energy manufacturing.
ENRX Weldac systems deliver energy savings and higher uptime for Marcegaglia
With new ENRX Weldac tube welders, Marcegaglia expects increased uptime and significant energy savings, supporting more efficient and scalable steel production.
Boron steel tube welding: solving challenges with ENRX Weldac technology
Boron steel offers exceptional strength but requires precise welding control. ENRX Weldac systems enable reliable, high-quality welding of advanced materials with consistency, efficiency, and process stability.
Explore Weldac applications
Solutions explained
Image gallery
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Compact Weldac - a small revolution: 1300 mm (h) x 1500 mm (l) x 500 mm (w).
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Automatic frequency adjusting to each tube dimension. Coil changes take only seconds.
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Easy-to-use control panel with intuitive guiding for operators.
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Double cabinet welder.
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Automated induction longitudinal welding is a reliable, high-throughput process.
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Weldac can be fittet with various induction coil or quick-lifting contact heads.
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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.
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The low power consumption and high efficiency of ENRX welding systems reduces costs.
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Ferrite for high-frequency tube welding.
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ENRX offer a full range of consumables, including coils, ferrite, impeders, and tube scarfing equipment.
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The high-speed troughput and reliability of induction welding makes it perfect for the tube and pipe industry
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Weldac's efficiency from input at the rectifier to output at the coil is 85-95%.
