SiC-MOS High Frequency Welder for ERW Pipe Production Lines

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SiC HF Welder for ERW Tube Mill

The SiC HF Welder is a solid-state high-frequency welding power supply designed for ERW tube mills. By using advanced SiC MOSFET technology, it delivers higher electrical efficiency, stable power output, and lower thermal loss compared with conventional Si HF welders. It helps improve weld consistency, reduce energy consumption, and lower long-term maintenance costs in continuous pipe production.

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Specification

What Is a SiC HF Welder?

A SiC HF Welder (Silicon Carbide High Frequency Welder) is a new-generation solid-state high-frequency welding power supply used in ERW tube mill lines. By adopting advanced SiC MOSFET power devices, it provides high-frequency energy to heat strip edges and complete continuous resistance welding.

Compared with conventional Si-based (Si-MOS) HF welders, SiC HF welders represent a clear technological upgrade in terms of energy efficiency, power stability, and long-term reliability, making them ideal for modern tube mills with higher quality and cost-control requirements.

Technical Comparison: Si-MOS HF vs. SiC-MOS HF Welder

💡The comparison below is based on solid-state HF welder configurations, following standard industrial specifications and actual application conditions.

Item	Si-MOS HF Welder	SiC-MOS HF Welder
Rectifier	High-voltage rectifier, rated DC voltage 450V	High-voltage rectifier, rated DC voltage 500–650V
Inverter Power Unit Design	1000V high-voltage Si-MOS, integrated power unit structure	1200V high-voltage SiC-MOS, integrated power unit structure
Resonance Tank Circuit	Series LC resonance	Series LC resonance
Safety Protection	Short-circuit & open-circuit protection; overload and impact resistance: medium	Short-circuit & open-circuit protection; overload and impact resistance: medium
Electrical Isolation	Matching transformer isolation on inverter side	Matching transformer isolation on inverter side
Control Technology	Full digital control	Full digital control
Control Precision	High	High
Maintainability	Medium	Good
Commissioning & Repair	General level of commissioning and repair skills required	Low level of commissioning and repair skills required
Parameter Setting	Digital setting via touch screen	Digital setting via touch screen
Power Stability	Digital double closed-loop PI regulator with power closed-loop regulation	Digital double closed-loop PI regulator with power closed-loop regulation
Load Matching	Matching transformer ratio adjustment + Pulse Shielded Modulation	Matching transformer ratio adjustment + Pulse Shielded Modulation
Full Power Output Capacity	Load-independent, strong power output capacity	Load-independent, strong power output capacity
Power Factor & Harmonic Suppression	≥ 0.90 above 25% rated power; low harmonic current	≥ 0.95 above 25% rated power; minimum harmonic current
Display Instrument	Digital display instrument + color touch screen	Digital display instrument + color touch screen
Integrated Electrical Efficiency	Good	Excellent

SiC high frequency welder

Key Advantages of SiC HF Welder

⚙️Higher Efficiency, Lower Energy Consumption

Thanks to the low switching and conduction losses of SiC devices, the overall power conversion efficiency is significantly improved. This helps reduce energy consumption per ton of pipe, especially in long-term continuous production.

⚙️More Stable Welding Power Output

SiC HF welders deliver more stable high-frequency power, ensuring uniform heat input at the strip edges. This improves weld seam consistency and reduces welding defects such as under-welding or overheating.

⚙️Lower Thermal Stress, Longer Service Life

Lower heat generation means reduced thermal stress on key components. As a result, the system operates more reliably and achieves a longer service life with less dependence on intensive cooling.

⚙️Easier Maintenance and Commissioning

With improved stability and simplified power unit structure, SiC HF welders require lower commissioning and repair skill levels, reducing downtime and maintenance costs.

SiC-MOS High Frequency Welder

High-Speed ERW Tube Production

Application in ERW Tube Mill Line

The SiC HF Welder is typically installed between the forming section and welding section, working together with squeeze rolls to complete high-frequency resistance welding. It is a core component that directly affects weld quality and production efficiency.

Why Choose a SiC HF Welder?

🔹Mature and Proven SiC Technology
SiC HF welding is no longer a new or experimental solution. The technology is fully mature and has been successfully applied in multiple ERW tube mill lines, with many units already delivered and running reliably in continuous production.
🔹Higher Electrical Efficiency and Power Quality
SiC power devices provide a higher power factor and better harmonic suppression, reducing energy loss and improving overall electrical efficiency, especially under long-term, high-load operation.
🔹More Stable Welding Power Output
Stable high-frequency output ensures consistent heat input and uniform weld quality, helping reduce welding defects and improve overall pipe consistency.
🔹Lower Thermal Stress and Maintenance Cost
Reduced switching loss and lower heat generation lead to lower component stress, easier maintenance, and longer service life, minimizing downtime and operating costs.
🔹Ideal Upgrade from Conventional Si HF Systems
For tube manufacturers seeking improved weld quality, energy efficiency, and production stability, the SiC HF Welder is a safe, reliable, and future-ready upgrade from traditional Si-based HF welders.

RELATION EQUIPMENT

We provides all equipment to tube mill entry section:

Coil Car

Single And Double Heads Un-coiler & Hydraulic And Pneumatic Un-coiler

Peeler and hold down roll arm

Flattening Machine

Automatic and Semi Auto Shearer & Butt Welder

Vertical Cage Accumulator & Horizontal Loop Accumulator & Landing Horizontal Spiral Loop Accumulator

disc accumulator to storage strip

erw tube mill feeding section

OUR SERVICE

Why Choose Us?

Leading Technology, Reliable Quality, Excellent Service!

Optimized Design, High quality material select!

Heat treatment process guarantee!

Spiral bevel gear, drum gear coupling and carburization.

Gear teeth quenching.

Driven system stable, efficient and wearable with lower noise.

High precision wear resisting and Long life of rollers.

All the machine Lathes, Key Grooves are positioned and Milled by CNC.

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FAQ – SiC HF Welder

Is SiC HF welding technology mature?

Yes. SiC HF welding technology is fully mature and has been widely applied in industrial ERW tube mills, with many units already operating reliably in continuous production.

What is the main advantage of SiC HF compared with Si HF?

SiC HF offers higher electrical efficiency, better power factor, lower harmonic current, and more stable welding power, resulting in consistent weld quality and lower operating costs.

Can SiC HF replace an existing Si HF welder?

Yes. In most cases, SiC HF welders can be used as a direct upgrade or replacement for conventional Si-based HF systems, with minimal changes to the existing tube mill.

Does SiC HF require special maintenance?

No. SiC HF welders generally require less maintenance due to lower thermal stress and improved system stability.

Is SiC HF suitable for long-term continuous production?

Yes. SiC HF welders are designed for continuous operation and are well suited for high-duty ERW tube mill production lines.

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