SiC High Frequency Welder: A New Standard for High-Speed ERW Tube Production

Jan . 29, 2026 00:00

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Solid-state high frequency (HF) welders are the core power source for ERW tube mills. They are used to heat strip edges by high frequency induction before pressure welding, ensuring stable and consistent weld seams.

With the development of power electronics, SiC-MOS HF welders are increasingly replacing traditional Si-MOS HF welders for high-speed, high-precision and energy-efficient ERW tube production.

SiC high frequency welder


What Is a SiC High Frequency Welder?

A SiC high frequency (HF) welder is the core power source used in ERW tube mills to heat the strip edges before pressure welding. It uses silicon carbide power devices instead of traditional silicon components.🧲

Thanks to the physical properties of silicon carbide, SiC HF welders can switch faster and operate at higher efficiency. This allows more precise control of welding current and heat input, which is critical for producing consistent and high-quality ERW weld seams.🔋


Comparison of Solid-State HF Welder

Si-MOS vs SiC-MOS HF Welder

Item Si-MOS HF Welder SiC-MOS HF Welder
Rectifier Rated DC voltage: 450V Rated DC voltage: 500V–650V
Inverter Power Unit Design 1000V Si-MOS, integrated structure 1200V SiC-MOS, integrated structure
Resonance Tank Circuit Series LC resonance Series LC resonance
Safety Protection Short & open circuit protection, overload resistance: Medium Short & open circuit protection, overload resistance: Medium
Electrical Isolation Matching transformer isolation Matching transformer isolation
Control Technology Full digital control Full digital control
Control Precision High High
Maintainability Medium Good
Commissioning & Repair General skill level required Lower skill level required
Parameter Setting Touch screen digital setting Touch screen digital setting
Power Stability Digital double closed-loop PI regulation Digital double closed-loop PI regulation
Load Matching Transformer ratio + Pulse Shielded Modulation Transformer ratio + Pulse Shielded Modulation
Full Power Output Load-independent, strong output Load-independent, strong output
Power Factor & Harmonics ≥ 0.90 (above 25% load) ≥ 0.95 (above 25% load)
Display Instrument Digital display + color touch screen Digital display + color touch screen
Integrated Electrical Efficiency Good Excellent

silicon carbide power

High-Speed ERW Tube Production


Quick Summary for Buyers

  • ⚡Si-MOS HF Welder: Cost-effective solution for standard ERW tube mills

  • ⚡SiC-MOS HF Welder: Premium solution for high-speed, thin wall and energy-saving ERW tube production

Si-MOS is lower in initial cost, while SiC-MOS delivers better efficiency, stability and lower long-term operating cost.

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