dtfinnedtube.com
Welded fin tubes are heat exchange elements that firmly connect fins to base tubes through welding technology. They are mainly used to enhance heat transfer efficiency and are widely used in the industrial field.
Structural features of welded fin tubes
It consists of a base tube (usually a steel tube) and fins (sheet or fin-shaped metal structures), which are tightly connected through welding processes (such as high-frequency welding, laser welding, etc.), thereby increasing the heat exchange surface area.
Manufacturing process of welded fin tubes
The main steps include material preparation, cutting and blanking, welding (high-frequency welding or laser welding), surface treatment (such as polishing, painting) and quality inspection. Among them, high-frequency welding generates heat through high-frequency current to achieve welding, while laser welding uses a laser beam to melt the metal to form a molten pool to complete the connection.
Application fields of welded fin tubes
It covers high-temperature and high-pressure scenes such as petrochemicals, electric power, chemicals, and metallurgy. It is used in heat exchangers, condensers and other equipment, and can withstand the impact of high-pressure fluids and maintain efficient heat exchange performance.
🔧 I. Manufacturing Processes & Technical Characteristics
-
High-Frequency (HF) Welding
- Utilizes the skin effect and proximity effect of high-frequency current to instantly melt the contact surface between fin and base tube, forming a metallurgical bond under pressure. Features high weld strength (withstands pressure >10 MPa) and a small heat-affected zone.
- Applicable Materials: Carbon steel, low-carbon steel, stainless steel, etc..
- Advantages: High production efficiency, tight fin-to-tube contact (low contact thermal resistance), excellent heat transfer performance.
-
Laser Welding
- Employs a high-precision laser beam to melt the joint between fin and base tube, achieving micron-level welds. Suitable for complex structures like spiral fins.
- Advantages: Extremely low thermal resistance, resistance to crevice corrosion, long service life, and suitability for secondary processing.
⚙️ II. Structural Features & Performance Advantages
-
Core Structure
- Base Tube: Typically seamless steel pipe, ensuring pressure resistance (>10 MPa) and fluid containment.
- Fin Design: Spiral or straight fins increase heat dissipation area by 3-10 times, promoting air turbulence and enhancing heat exchange efficiency.
-
Performance Advantages
- High-Efficiency Heat Transfer: Fins expand heat exchange area and reduce thermal resistance, improving thermal conductivity by over 50% compared to bare tubes.
- Corrosion Resistance: Surface galvanization or use of stainless steel enables tolerance to acid/alkali vapors in dyeing mills and corrosive petrochemical environments.
- Environmental Adaptability: Operates in -40°C to 300°C conditions, suitable for high-temperature steam, thermal oil, and other media.
🏭 III. Application Scenarios
-
Industrial Sector
- Textile & Dyeing: Rapid heat dissipation in high-humidity workshops with chemical corrosion resistance.
- Petrochemicals/Power: High-temperature & high-pressure heat exchange (e.g., boiler waste heat recovery).
- Agriculture: Greenhouse heating (e.g., DN65 round-wing fin tubes with flanges for easy installation).
-
Civil Sector
- Central heating radiators, air conditioning heat exchange modules.
🔧 IV. Installation & Maintenance Key Points
-
Installation Steps
- Inspect fin tube integrity → Position ventilation/maintenance access → Level and secure brackets → Seal pipe connections (sealant/gaskets) → Pressure test (hold at 0.5x design pressure for 30 mins) → Commissioning.
-
Maintenance Focus
- Regularly remove fin dust accumulation, inspect welds for corrosion/cracks, ensure unobstructed airflow.
🔍 V. Production Process Comparison
| Process | HF Welding | Laser Welding |
|---|---|---|
| Efficiency | High (mass production) | Medium-High (precision focus) |
| Precision | Relatively High | Extremely High (micron-level) |
| Applications | Standard industrial heat exchangers | High-precision, strict anti-corrosion scenarios |
| Cost | Lower | Higher |
| Factory | Cangzhou Datang Tubo d'acciaio Co., Ltd. |
💎 Summary
Welded fin tubes utilize HF welding or laser welding to achieve robust bonds between fins and base tubes. Their core advantages—expanded heat dissipation area and reduced thermal resistance—make them high-efficiency thermal solutions for petrochemicals, greenhouses, dyeing, and other fields. Selection requires comprehensive evaluation of media properties, operating pressure, and corrosive environment, with strict adherence to installation standards ensuring long-term reliability45.
