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Company: Shijiazhuang FAITH Machinery Co., Ltd.
Email: crystal@faith-machinery.com
In modern manufacturing, high frequency welding (HF welding) has become a cornerstone technology for joining thermoplastic materials with precision, strength, and speed.
Unlike traditional thermal or mechanical joining methods, the High Frequency Welder uses electromagnetic energy to heat the material internally, creating clean, uniform, and durable bonds without adding adhesives or fasteners.
From PVC tarpaulin and conveyor belts to automotive interiors and medical bags, HF welders offer unmatched consistency and control — making them a preferred choice across multiple industries worldwide.
A High Frequency Welder (HF Welder), also known as a Radio Frequency (RF) Welder, is a specialized machine that uses high-frequency electromagnetic fields (usually 27.12 MHz) to generate heat within materials, typically thermoplastics such as PVC, PU, EVA, or PET.
When the plastic molecules are exposed to the HF field, dipole molecules oscillate rapidly, producing internal frictional heat that melts the material locally. Once the pressure is applied, the pieces fuse seamlessly into a strong joint.
Material Placement
The two plastic sheets or components are placed between the upper and lower electrodes of the HF welder.
HF Energy Activation
The machine generates electromagnetic waves at a specific frequency (typically 13.56 MHz, 27.12 MHz, or 40.68 MHz), causing molecular oscillation inside the materials.
Heat Generation
The oscillating molecules create frictional heat internally, melting only the joint area.
Pressure Application
The electrode applies consistent pressure, ensuring the molten surfaces bond tightly.
Cooling Phase
The HF energy stops, the material solidifies under pressure, forming a permanent, homogeneous weld.
| Type | Description | Key Application |
|---|---|---|
| Manual HF Welder | Operated by hand lever, suitable for small workshops | Small PVC bags, stationery |
| Foot Pedal HF Welder | Foot-operated, semi-automatic pressure control | Packaging, banners |
| Automatic HF Welder | PLC-controlled with programmable welding cycles | Conveyor belts, large covers |
| Rotary Table HF Welder | Multi-station system for continuous production | Car mats, medical pouches |
| Traveling Head HF Welder | Mobile electrode head for long weld seams | Tarpaulin, tents, curtain walls |
Shijiazhuang FAITH Machinery Co., Ltd. offers all these configurations with custom power ranges and table sizes to fit client requirements.
The joint is as strong as the base material, with no visible overlap lines or burns.
Cycle times range from 1 to 10 seconds, far faster than hot-air or ultrasonic methods.
No need for adhesives, solvents, or mechanical fasteners — environmentally friendly and odor-free.
HF welding focuses energy only at the joint interface, minimizing surface damage.
Capable of welding rigid and flexible PVC, polyurethane, and other polar thermoplastics.
Welds are smooth, sealed, and water- or air-tight — ideal for visual or functional applications.
| Feature | High Frequency (HF) Welder | Ultrasonic Welder |
|---|---|---|
| Heating Mechanism | Internal molecular friction (radio frequency) | Surface vibration and friction |
| Material Type | Polar thermoplastics (PVC, PU, PET) | Most thermoplastics (limited thickness) |
| Welding Area | Large or continuous seams | Small joints only |
| Joint Appearance | Seamless and aesthetic | Slight marks or ridges |
| Thickness Range | Up to 3 mm or more | Typically under 2 mm |
| Noise Level | Low | High |
| Best Used For | Banners, covers, bladders | Small plastic housings |
Summary:
HF welders are superior for large sheets, waterproof seams, and flexible PVC products, while ultrasonic welders are best for small injection-molded parts.
| Industry | Product | Welding Purpose |
|---|---|---|
| Packaging | PVC blister packs, pouches, vacuum bags | Airtight seals |
| Automotive | Door panels, sun visors, instrument covers | Seam welding and lamination |
| Medical | IV bags, blood collection bags | Sterile sealing |
| Inflatable Products | Tents, boats, air beds | Air-tight seam joints |
| Textiles | Tarpaulins, banners, awnings | Long-length seam joining |
| Conveyor Belts | PU belts, cleats, sidewalls | Durable continuous welding |
Shijiazhuang FAITH Machinery Co., Ltd. supplies custom HF welders tailored to each of these applications, ensuring consistent performance and compliance with international standards.
| Model | Output Power | Frequency | Electrode Size | Working Table | Cooling Type |
|---|---|---|---|---|---|
| FAITH-HF5 | 5 kW | 27.12 MHz | 300×400 mm | Fixed | Air |
| FAITH-HF8 | 8 kW | 27.12 MHz | 500×700 mm | Sliding | Air |
| FAITH-HF12 | 12 kW | 27.12 MHz | 700×1000 mm | Rotary | Water-cooled |
| FAITH-HF25 | 25 kW | 27.12 MHz | 1000×1500 mm | Traveling Head | Water-cooled |
Note: All models can be customized for different electrode sizes, frequencies, and automation levels.
| Model Type | Power Output | Application | Estimated Price (USD) |
|---|---|---|---|
| Small Manual HF Welder | 3–5 kW | Small PVC products | $3,000 – $5,000 |
| Medium Automatic HF Welder | 8–12 kW | Automotive, packaging | $6,000 – $10,000 |
| Industrial Traveling Head HF Welder | 15–25 kW | Tarpaulin, conveyor belts | $12,000 – $18,000 |
| Fully Automated Rotary HF Welder | 20–30 kW | Continuous production | $20,000 – $30,000 |
Pricing depends on power capacity, automation level, and table size.
Contact crystal@faith-machinery.com for detailed quotations and technical drawings.
| Component | Function |
|---|---|
| HF Generator | Produces high-frequency electromagnetic energy |
| Oscillator Tubes (Triode) | Controls power output and frequency stability |
| Pneumatic System | Ensures even pressure during welding |
| Cooling System | Maintains electrode and oscillator temperature |
| PLC Controller | Manages timing, power, and safety interlocks |
| Mold or Electrode | Defines weld shape and seam precision |
Each component directly influences weld strength, cycle time, and durability, which is why FAITH Machinery uses high-quality vacuum tubes and precision pneumatic regulators in every unit.
Ensure both surfaces are clean and free of oil or dust. Even small contamination can cause spark discharge or weak seams.
Pressure must be even across the entire weld area. FAITH’s air-balanced system ensures consistent compression.
Adjust output power based on material thickness and dielectric loss factor.
Allow sufficient cooling under pressure before release to prevent seam distortion.
Keep electrode surfaces smooth and polished; rough surfaces can cause uneven heat distribution.
| Problem | Possible Cause | Solution |
|---|---|---|
| Spark during welding | Contaminated materials or high power | Clean sheets and reduce HF power |
| Weak seam | Low pressure or insufficient time | Increase dwell time and adjust pressure |
| Material sticking to electrode | Overheating | Shorten heating time or use PTFE layer |
| Uneven weld edges | Poor electrode contact | Realign and level the mold |
| Machine won’t start | Generator fault or overload protection triggered | Check fuse, tube, and voltage supply |
Spring offers moderate temperature and humidity — ideal for consistent HF welding output.
During summer, humidity can cause dielectric fluctuations in PVC, while winter’s low temperature affects preheat times.
Stable ambient temperature = uniform weld quality
Reduced static = fewer spark discharges
Perfect season for equipment calibration and mold changeovers
Shijiazhuang FAITH Machinery recommends annual preventive maintenance and tube inspection in spring to prepare for peak production months.
| Interval | Task |
|---|---|
| Daily | Clean electrodes and check pressure valves |
| Weekly | Inspect air filters, hoses, and connections |
| Monthly | Measure HF frequency output and recalibrate |
| Quarterly | Replace oscillator tubes if performance drops |
| Annually | Overhaul pneumatic system and electrical wiring |
Proper maintenance ensures longer tube life, consistent performance, and reduced downtime.
A 15 kW traveling-head HF welder improved seam strength by 20% and reduced labor time by 35%.
Automatic rotary HF welder achieved 12,000 bag seams daily with zero leakage.
25 kW machine completed long-length welds (up to 15 meters) with uniform seam width.
PLC-controlled 8 kW HF welder integrated with robotic loading for precision and repeatability.
As a professional HF welding equipment manufacturer, Shijiazhuang FAITH Machinery Co., Ltd. combines advanced design, precision control, and reliable after-sales service.
Over 20 years of manufacturing experience
Custom-built machines for unique applications
ISO and CE certified quality management
Professional installation and training support
Fast spare parts and remote service capability
Whether you need a manual HF welder for flexible packaging or an industrial traveling-head system for tarpaulin production, FAITH Machinery provides complete welding solutions from design to delivery.
Q1: What materials can be welded using HF welders?
A: Mainly polar thermoplastics like PVC, PU, PET, EVA, and certain coated fabrics.
Q2: What frequency range is used in FAITH HF welders?
A: Typically 27.12 MHz, but 13.56 MHz and 40.68 MHz options are available for special applications.
Q3: Are FAITH HF welders compliant with CE or ISO standards?
A: Yes, all units meet CE, ISO9001, and international safety requirements.
Q4: Can I use custom molds or electrodes?
A: Absolutely. FAITH designs custom electrodes for branding, embossing, or sealing applications.
Q5: Do you offer training?
A: Yes — both online and on-site training are available for operators and maintenance personnel.
The High Frequency Welder (HF Welder) represents the future of efficient, precise, and eco-friendly plastic joining.
With faster cycle times, flawless seam quality, and advanced automation, HF welding continues to redefine industrial manufacturing standards.
Shijiazhuang FAITH Machinery Co., Ltd. delivers custom-engineered HF welding machines backed by proven performance, technical expertise, and lifelong customer support — making it your trusted partner for professional high-frequency welding solutions.
Email: crystal@faith-machinery.com
High Frequency Welder Manufacturer – Shijiazhuang FAITH Machinery Co., Ltd.
Precision, Performance, and Productivity in Every Weld.
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