The Advantages of High Frequency Welded Solid Finned Tubes
Superior Heat Transfer Performance
The solid, continuous fin structure—welded using high-frequency induction—creates a seamless thermal bond between tube and fin, eliminating contact resistance. This results in up to 300% higher heat transfer efficiency compared to extruded or wrapped fin designs.
Zero-Fin-Detachment Guarantee
Unlike mechanically attached fins that loosen under thermal cycling, our HF-welded solid fins are metallurgically fused to the base tube. This ensures long-term reliability in high-vibration, high-pressure, and fluctuating-temperature environments—critical for power plants, petrochemical refineries, and HVAC systems.
Corrosion & Erosion Resistant
Made from premium-grade carbon steel, stainless steel (304/316), or alloy materials, our tubes withstand aggressive fluids, salt spray, and abrasive gases. Optional surface treatments like epoxy coating or galvanization extend service life in offshore, marine, and chemical processing applications.
Precision Engineering for Maximum Density
With fin heights up to 35mm, fin pitches as tight as 3.5mm, and custom profiles (straight, serrated, or louvered), we optimize surface area without compromising airflow or fluid dynamics. This allows for smaller, lighter heat exchangers—reducing footprint, shipping costs, and installation time.
Cost-Effective Manufacturing at Scale
High-frequency welding enables high-speed, automated production with consistent quality and minimal waste. Lower labor costs, reduced material usage, and extended maintenance intervals translate to a lower total cost of ownership over the system’s lifecycle.
Certified to Global Standards
Every batch is tested per international standards, and ISO 9001 standards. Full material traceability, pressure testing, and dimensional inspection reports are provided with every shipment—giving engineers and procurement teams full confidence in compliance and safety.
Technical Data Sheet of Our High Frequency Welded Solid Finned Tubes
| Base Tube Diameter | 16 to 350 mm | 3/8″ to 14″ NPS |
| Base Tube Wall Thickness | 2 to 30 mm | 0.08″ to 1.18″ |
| Base Tube Length | ≤32,000 mm | ≤92 ft |
| Base Tube Material | Carbon Steel (ASTM A106B, EN 10216-2 P235GH, ASTM A179, ASTM A210, ASTM A192, etc.) Alloy Steel (ASTM A335 or ASTM A213 P5, T5, P9, T9, T11, T22, etc.) Stainless Steel (ASTM A213 or ASTM A312 TP304, TP316, TP347, B407 800H/HT, etc.) | |
| Fin Pitch | 39 to 277 FPM | 1 to 7 FPI |
| Fin Height | 8 to 35 mm | 0.31″ to 1.38″ |
| Fin Thickness | 0.5 to 3 mm | 0.02″ to 0.12″ |
| Fin Material | Carbon Steel, 2.25Cr-1Mo, 5Cr-0.5Mo, 11-13Cr (409, 410), 18Cr-8Ni (SS 304), 25Cr-20Ni, aluminum | |
| Fin Type | Solid | |
For other customized requirements for solid fin tubes, please contact us.
Applications of High Frequency Welded Solid Finned Tubes
Where Our HF-Welded Solid Finned Tubes Deliver Maximum Impact:
Air-Cooled Heat Exchangers (ACHE) in Power Plants & Refineries
In environments where water is scarce or cost-prohibitive, our high frequency resistance welded finned tubes form the backbone of air-cooled condensers and radiators. Their high fin density and corrosion-resistant alloys (304/316 stainless, carbon steel with epoxy coating) ensure reliable operation in desert climates, offshore platforms, and remote mining sites — reducing downtime and maintenance costs by up to 40%.
Condensers in Steam & Gas Turbine Systems
For power generation facilities, our high frequency resistance welding spiral finned tubes enable efficient steam condensation under high vacuum and fluctuating loads. The seamless fin-to-tube bond resists thermal fatigue from repeated start-stop cycles, making them ideal for combined-cycle plants and cogeneration systems where uptime equals profitability.
Refrigeration & Cryogenic Cooling Systems
From LNG terminals to pharmaceutical cold chains, our high frequency resistance welding spiral finned tubes handle extreme temperature differentials (-196°C to +150°C) without embrittlement or delamination. Precision fin spacing (as low as 3.5mm) maximizes surface area for rapid heat exchange in compact evaporators and condensers — critical for energy-efficient cold storage and liquefaction plants.
Waste Heat Recovery Units (WHRUs)
Turn exhaust gases from boilers, kilns, and engines into usable thermal energy. Our high frequency welded fin tubes withstand abrasive flue gases and acidic condensates while transferring heat to water, oil, or thermal fluids. This leads up to 20% reduction in fuel consumption and faster ROI on sustainability investments.
Industrial Drying, Evaporation & Distillation Systems
In chemical, food, and pulp & paper processing, our high frequency welded fin tubes provide uniform heat distribution in reboilers and evaporators. Serrated or louvered fin profiles enhance turbulence and prevent fouling — extending cleaning intervals and reducing operational interruptions.
HVAC & Commercial Refrigeration for Large-Scale Facilities
From data center cooling to supermarket refrigeration racks, our high frequency resistance welding spiral finned tubes enable quieter, more compact systems. Their lightweight design reduces structural load, while corrosion resistance ensures longevity in humid or salt-laden environments — a key advantage for coastal installations.
Marine & Offshore Applications
Engineered for salt spray, high humidity, and vibration, our high frequency resistance welding spiral finned tubes are trusted in shipboard condensers, desalination units, and offshore platform cooling systems. Optional galvanized or nickel-plated finishes provide an extra layer of defense against marine corrosion.
Certifications & Quality Control of Our High Frequency Welded Solid Finned Tubes
- ISO 9001:2015 Certified Manufacturing
- EN 10204 3.1/3.2 for tubes
- EN 10204 2.2 for fins
- Material Test Reports (MTR) available per batch
- Non-Destructive Testing (NDT): VT, UT, PT, RT, MT
- Third-party inspection by SGS, Bureau Veritas, TUV
- 12-month warranty on material and weld integrity
The Key Features of High Frequency Welded Solid Finned Tubes
Structure:
- Base Tube: Typically carbon steel tubes, stainless steel tubes, or alloy steel tubes.
- Fins: Solid metal strips (not hollow) welded tightly to the tube.
- Bonding Method: High-frequency welding creates a metallurgical bond between the fin and tube, ensuring minimal thermal resistance.
How It Works:
- High-frequency electrical currents generate localized heat, melting the fin and tube surfaces.
- Pressure is applied to fuse the materials, forming a seamless and durable joint.
One of the key design features of high-frequency welded solid fin tubes is the continuous weld line that runs along the entire length of the fin-to-tube interface. This creates a strong, uniform bond that can withstand thermal cycling and mechanical stresses better than other attachment methods. The fins are usually spaced closely together to maximize surface area while maintaining adequate flow channels for the heat transfer medium.
The Manufacturing Process of High Frequency Welded Solid Finned Tubes
Material Preparation
- Base Tube Selection: Carbon steel pipes, stainless steel pipes (304/316), or seamless steel pipes are selected for their mechanical strength and compatibility with high-frequency welding.
- Fin Strip Material: Aluminum fins or steel strips (0.3–1.2 mm thickness) are precision-cut to match the base tube dimensions.
Pre-Treatment
- Surface Cleaning: Base tubes undergo degreasing and pickling to remove oxides, ensuring optimal welding surface conditions.
- Fin Strip Alignment: Strips are helically wound around the base tube with controlled tension to maintain uniform spacing.
High-Frequency Welding
- Induction Heating: High-frequency current (100–400 kHz) generates localized heat at the fin-tube interface, melting the fin strip edge and bonding it to the base tube.
- Pressure Rolling: Simultaneous mechanical pressure (10–30 MPa) ensures metallurgical bonding without filler materials.
Rapid Cooling
- Water cooling is typically employed, where water at 20–30°C is sprayed (flow velocity of 1.5–2 m/s) to achieve rapid cooling. The cooling time is controlled within 1–3 seconds to ensure the molten metal solidifies quickly.
How to Control the Quality of High Frequency Welded Solid Finned Tubes
Quality Control of Raw Materials
- Before finning, steel tubes and fin strips shall be visually inspected for identification and to check if any defects incompatible with finning operations still remain.
Welding Control of Finned Tubes
- Welding should be carried out in accordance with the WPS and PQR approved by the customer.
- During the welding, finned tubes shall be random controlled in order to check the welding quality and the geometrical characteristics. Spot examination shall be carried out at least on one out of 10 tubes. If anomaly is detected, the 9 previous tubes shall be examined again. Examination shall be extended if anomaly and/or defects are confirmed.
Visual and Dimension Check of Finned Tubes
- the following dimensions shall be checked: straightness of finned tube, total length of finned tube, bare length of finned tube, pitch of finned tube, fin height, fin thickness, fin perpendicularity, etc.
Comparison with Other Finned Tubes
| Type | Bonding Method | Fin Type | Typical Use |
| HFW Solid Spiral Finned Tube | Welded (HF current) | Solid metal | High-stress environments |
| HFW Serrated Spiral Finned Tube | Welded (HF current) | Serrated metal | High-stress environments |
| Laser Welded Finned Tube | Welded (Laser) | Solid metal | High-stress environments |
| Extruded Finned Tube | Mechanically bonded | Hollow fins | Moderate-temperature use |
| Embedded Finned Tube | Rolled into grooves | G/L-shaped fins | Low-pressure systems |
Maintenance and Operational Considerations
To ensure optimal performance and longevity of High Frequency Welded Solid Finned Tubes in service, several maintenance and operational practices should be followed:
Regular Inspection: Periodic visual and non-destructive inspection of finned tubes can help identify issues such as corrosion, fouling, or mechanical damage early.
Cleaning Protocols: Depending on the application, appropriate cleaning methods (mechanical, chemical, or thermal) should be employed to remove deposits that could impair heat transfer.
Operational Parameters: Operating within the designed temperature and pressure limits is crucial to prevent premature failure of the finned tubes.
Corrosion Protection: In corrosive environments, implementing proper corrosion protection measures can significantly extend service life.
Repair Techniques: For damaged finned tubes, specialized repair techniques may be available to restore functionality without full replacement.
Properly maintained high-frequency welded solid finned tubes can provide many years of reliable service, making them a cost-effective solution for industrial heat exchange needs despite their higher initial cost compared to some alternatives.
Why Choose Us
- a 16-year finned tube manufacturer. We are experts.
- solutions for all finned tube prouducts
- the highest product quality
- the low lead times
- excellent customer service
