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

Jan . 29, 2026 00:00

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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