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In the modern metal processing and pipe production industry, high frequency welders (HF welders) have become essential equipment for efficient, energy-saving, and precise welding operations.
Used primarily in ERW (Electric Resistance Welding) tube mills, metal pipe manufacturing lines, and steel coil joining applications, a high frequency welder provides consistent, high-quality welds with minimal distortion — ensuring strong, seamless joints at production speeds unmatched by traditional welding methods.
This guide explores how HF welders work, the types available, key specifications, and the top manufacturers and suppliers in China for 2026.
A high frequency welder is a specialized welding power supply system that uses high-frequency electrical current (typically 100–500 kHz) to heat the edges of metal materials — usually steel strips — before forging them together to create a solid, continuous weld.
The technology is central to ERW (Electric Resistance Welding) processes used in manufacturing steel tubes, pipes, and profiles.
The high frequency welding process follows a series of precise, controlled steps:
Edge Preparation: Steel strip edges are shaped using forming rollers in the tube mill.
High-Frequency Induction Heating: A high frequency welder induces electrical current along the edges of the strip, generating heat through electrical resistance.
Pressure Forging: The heated edges are pressed together under pressure, forming a solid-state weld without filler material.
Bead Removal: Internal and external weld beads are trimmed to ensure smooth surfaces.
This process allows for continuous, high-speed production of welded pipes with exceptional strength and appearance.
| Type | Frequency Range | Technology | Applications |
|---|---|---|---|
| Solid-State HF Welder | 100–450 kHz | IGBT/MOSFET inverter | Modern tube mills, energy efficient |
| Vacuum Tube HF Welder | 100–400 kHz | Electron tube oscillation | Traditional ERW systems |
| Contact Type Welder | 100–500 kHz | Direct electrical contact | Small/medium diameter pipes |
| Induction Type Welder | 150–400 kHz | Induction coil coupling | Larger diameter steel pipes |
| Dual Mode HF Welder | Variable | Combined contact + induction | Flexible production environments |
Among these, the solid-state HF welder has become the global standard due to its higher efficiency, reduced energy loss, and improved reliability.
High Speed: Welding speeds up to 120 m/min.
Strong Joints: Consistent metallurgical bonding with no filler metal.
Low Distortion: Minimal heat-affected zone (HAZ).
Energy Efficient: 15–20% lower power consumption than traditional welders.
Clean Operation: No sparks or fumes typical of arc welding.
Reduced Maintenance: Solid-state systems require less frequent servicing.
| Rank | Manufacturer | Location | Core Product | Export Market |
|---|---|---|---|---|
| 1 | Shijiazhuang Faith Machinery Co., Ltd. | Hebei | Solid-state HF welders for ERW tube mills | Global export |
| 2 | Tengdi Machinery Co., Ltd. | Hebei | HF induction welders, ERW pipe lines | Asia, Middle East |
| 3 | Wuxi New Victor Industrial Co., Ltd. | Jiangsu | High frequency solid-state welder systems | Europe, South America |
| 4 | Wuxi Feifu Machinery Co., Ltd. | Jiangsu | Tube mill + HF welder integration | Southeast Asia |
| 5 | Jiangsu Huitong Welding Equipment Co., Ltd. | Jiangsu | HF welders for steel pipe production | Domestic + export |
| 6 | Hebei Tengtian Welding Equipment Co., Ltd. | Hebei | High power vacuum tube HF welders | Middle East |
| 7 | Wuxi Bangzhou Machinery Co., Ltd. | Jiangsu | Energy-saving IGBT solid-state welders | Europe |
| 8 | Zhangjiagang Hengli Machinery Co., Ltd. | Jiangsu | HF welders + pipe forming lines | Global |
| 9 | Wuxi Sunway Machinery Co., Ltd. | Jiangsu | Complete ERW line with HF system | Africa, Latin America |
| 10 | Foshan YXH Tube Mill & Mould Co., Ltd. | Guangdong | Small pipe HF welder systems | Southeast Asia |
Shijiazhuang Faith Machinery Co., Ltd. is a leading manufacturer of high frequency welders and complete steel pipe production lines in China.
The company designs, manufactures, and exports solid-state HF welders, ERW tube mills, and coil processing lines, serving over 40 countries worldwide.
Highlights:
Over 20 years of production experience.
Integration of Siemens PLC and Yaskawa inverter technology.
Custom power range from 100 kW to 1000 kW.
Full on-site installation and training services.
ISO9001 and CE certified.
Contact Details:
Email: crystal@faith-machinery.com
Company: Shijiazhuang Faith Machinery Co., Ltd.
Address: Shijiazhuang City, Hebei Province, China
| Parameter | Specification |
|---|---|
| Output Power | 100 – 1000 kW |
| Frequency Range | 100 – 450 kHz |
| Cooling Method | Water circulation cooling |
| Power Conversion Efficiency | ≥ 90% |
| Welding Speed | Up to 120 m/min |
| Input Voltage | 380V / 50Hz (customized) |
| Control System | PLC + touch screen interface |
| Suitable Pipe Diameter | 8 – 325 mm |
| Material Compatibility | Carbon steel, stainless steel, galvanized steel |
| Power Components | IGBT solid-state inverter |
Faith Machinery’s solid-state HF welders deliver stable, uniform heating with automatic protection systems against overcurrent, overvoltage, and water pressure faults.
DC Power Supply: Provides constant DC input for conversion.
Inverter Unit: Converts DC into high-frequency AC using IGBT modules.
Output Transformer: Adjusts voltage and current for the welding head.
Impedance Matching Circuit: Ensures optimal power transfer.
Induction Coil or Contact Head: Delivers current to the strip edges.
Cooling System: Removes heat generated during operation.
Control Panel: Provides real-time monitoring and data display.
Faith’s HF welders use modular inverter design for easy maintenance and upgrade flexibility.
| Feature | HF Welding | Arc Welding / MIG |
|---|---|---|
| Heating Method | Electrical induction | Electric arc |
| Production Speed | Up to 120 m/min | Manual or semi-auto |
| Energy Efficiency | High (90%) | Moderate (70%) |
| Heat Affected Zone | Small | Large |
| Surface Finish | Clean, smooth | Requires finishing |
| Common Use | Tube mills, pipe welding | Structural fabrication |
HF welding is preferred for continuous, automated production lines, while arc welding is suited for fabrication and repair work.
| Industry | Application | Typical Material |
|---|---|---|
| Pipe & Tube Manufacturing | ERW pipe production | Carbon steel, stainless steel |
| Automotive | Exhaust systems, precision tubing | Alloy steel |
| Furniture | Metal frames, round tubes | Mild steel |
| HVAC | Air conditioning pipes | Galvanized steel |
| Construction | Scaffolding, square tubes | Structural steel |
| Agriculture | Irrigation pipes | Galvanized steel |
Modern HF welders integrate digital control systems and closed-loop feedback technology to optimize performance and reduce energy consumption.
IGBT inverter for low power loss.
Auto-frequency tracking for stable welding.
Touchscreen control for precise parameter adjustment.
Modular design for easy installation and troubleshooting.
Energy-saving circuits reduce power usage by 15–25%.
Cooling System Maintenance: Regularly check water circulation to prevent overheating.
Electrode Inspection: Clean and realign induction coils or contact heads.
Electrical Safety: Always ground the welder properly.
Periodic Calibration: Maintain consistent output power and frequency.
Software Updates: Keep PLC and firmware current for optimal control accuracy.
The global HF welder market is projected to grow steadily, driven by increasing demand for automated tube manufacturing and energy-efficient welding systems.
Asia-Pacific remains the largest producer and exporter, led by China.
Europe and North America adopt HF technology for automotive and precision applications.
Emerging markets in Africa and South America show strong investment in infrastructure, boosting pipe production demand.
Q1: What’s the difference between solid-state and vacuum tube HF welders?
A1: Solid-state uses IGBT or MOSFET transistors for higher efficiency and reliability, while vacuum tube welders are older, less efficient systems.
Q2: What power range should I choose?
A2: It depends on pipe diameter — 100–200 kW for small tubes, 400–1000 kW for large pipes.
Q3: Can the welder handle stainless steel?
A3: Yes, Faith’s HF welders are compatible with carbon, stainless, and galvanized steel materials.
Q4: What cooling system is required?
A4: Closed-loop water cooling with stainless steel or copper heat exchangers.
Q5: How long does installation take?
A5: Typically 7–15 days depending on project size and site readiness.
Q6: What’s the expected service life?
A6: Over 10 years with proper maintenance and regular inspection.
Factory-direct pricing saves up to 40% compared to Western brands.
Global export experience with CE-certified equipment.
Comprehensive after-sales support in English and multiple languages.
Customizable configurations for pipe diameter, material, and line speed.
Reliable components (Siemens, Schneider, Yaskawa) ensure long service life.
| Service | Description |
|---|---|
| Packaging | Anti-rust protection and export wooden crate |
| Delivery | 45–75 days depending on model |
| Installation | On-site engineer assistance available |
| Training | Operator training and technical documentation |
| Warranty | 12 months with lifetime technical support |
| Spare Parts | Long-term global supply guarantee |
A high frequency welder is the core component of every ERW tube mill or steel pipe production line, ensuring speed, precision, and consistency in welding performance.
For businesses seeking factory-direct, CE-certified welding systems, Shijiazhuang Faith Machinery Co., Ltd. offers solid-state HF welders designed for efficiency, reliability, and global adaptability.
Email: crystal@faith-machinery.com
Company: Shijiazhuang Faith Machinery Co., Ltd.
Location: Hebei Province, China
Partner with Faith Machinery — your trusted high frequency welder manufacturer in China, delivering technology that connects steel with precision and strength.
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