Laser welded Fin Tube Coils
Laser-welded finned tube coils represent a core process applying laser welding technology to the secondary forming of finned tubes. It achieves a metallurgical bond between fins and the base tube through high-precision laser welding before coil winding into compact, high-efficiency heat exchange units.
- Base Tube Material:
CS (A106, A333, A179, A210, P5, P11, P22)
SS (SS304, SS316, Duplex SS2205, Super Duplex SS32750)
Nickel Alloys (825, Inconel Alloy 625, High chrome high nickle incoloy alloy Monel 400) - Tube OD:15.88mm~273mm or customized
Product Details
Laser-Welded Finned Tube Coils for Heat Exchanger
Laser-welded finned tube coils represent a core process applying laser welding technology to the secondary forming of finned tubes. It achieves a metallurgical bond between fins and the base tube through high-precision laser welding before coil winding into compact, high-efficiency heat exchange units. Key technical features and application advantages are as follows:
I.Laser-Welded Finned Tube Coils Core Process & Technical Advantages
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Laser Welding Precision Bonding
- Utilizes a high-energy laser beam (1–6 kW) to achieve deep fusion welding between fins and the base tube. Weld tensile strength exceeds 95% of the base material.
- Heat Affected Zone (HAZ) width < 0.1 mm, minimizing material lattice deformation and ensuring structural stability during coil bending.
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Material Compatibility & Lightweight Design
- Base tube thickness: 0.8–1.5mm, Fin thickness: 0.3–1.0mm. Achieves 30% weight reduction and lower material costs compared to traditional processes.
- Supports combinations of dissimilar materials like stainless steel (304/316L), carbon steel, copper, and aluminum, adapting to corrosive media environments (e.g., chemical reactors, seawater cooling systems).
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Structural Adaptability for Coil Forming
- Laser welds are uniform and dense, free from localized thermal stress concentration. Allows direct cold or hot bending.
- Achieves minimum bending radius of 1.5 times tube diameter (e.g., Ø25mm tube bendable to R37.5mm), meeting compact space layout requirements.
II.Laser-Welded Finned Tube Coils Performance Advantages & Measured Data
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Enhanced Heat Transfer Efficiency
- Contact thermal resistance approaches zero (over 60% lower than traditional HF-welded tubes). Heat transfer coefficient increases by 18–25%.
- Case Study: Petrochemical catalytic cracking unit retrofit increased flue gas waste heat recovery rate from 62% to 89%, saving 12,000 tons of coal annually.
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Resistance to Operational Fluctuations
- Vibration fatigue life reaches 10⁷ cycles (HF-welded tubes: only 3×10⁶ cycles), withstands thermal stress shock from boiler start-stop cycles with ΔT=300°C.
- Offshore Platform Case: No crevice corrosion observed after 8 years in environments with Cl⁻ >5000mg/L. Service life is 2.6 times that of embedded fin tubes.
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Long-Term Cost Effectiveness
- Initial cost is 15–20% higher. However, low fouling factor (0.0002 m²·K/W) and reduced maintenance enable recovery of the cost difference within 3–5 years. Service life reaches 15–20 years.
III.Laser-Welded Finned Tube Coils Typical Application Scenarios
| Sector | Application Equipment | Performance |
|---|---|---|
| HVAC&R | Fan Coils / Air Cooler Evaporators | Heat transfer area increased by 3–10x; Cooling energy efficiency improved by 15% |
| Energy & Power | Boiler Economizers / Air Pre-heaters | Flue gas temperature reduced below 120°C; Thermal efficiency increased by +3% |
| Chemical & Pharma | Reactor Coils / Condensers | Resists strong acid/alkali corrosion, reduces shutdown frequency for cleaning |
| Shipbuilding | Seawater Cooling Coils | Compact design saves cabin space; Resistant to salt spray corrosion |
IV.Laser-Welded Finned Tube Coils Custom Specification Reference
- Base Tube Size: Ø16–32mm (Expandable to Ø150mm)
- Fin Parameters: Height 8–15mm, Spacing 2.5–15mm, Helix Angle 30°–60°
- Coil Configuration: Single-layer spiral, Multi-layer concentric circles; Compatible with Shell & Tube / Plate Heat Exchangers
V.Laser-Welded Finned Tube Coils Future Development Direction
- Dissimilar Material Welding Innovation: Combinations like Inconel 625 fins + 316L base tube to solve thermal expansion matching issues at 900°C.
- Smart Production Line Integration: Vision positioning systems (±0.05mm accuracy) with adaptive laser parameter control for zero-defect welding.
- Datasheet
- Drawing
- Certificates
| Parameter | Specification |
|---|---|
| Base Tube Material | CS (A106, A333, A179, A210, P5, P11, P22), SS (SS304, SS316, Duplex SS2205, Super Duplex SS32750), Nickel Alloys (825, Inconel Alloy 625, High chrome high nickel incoloy alloy Monel 400) |
| Tube OD | 15.88 mm ~ 273 mm or customized |
| Tube Wall Thick | 2 mm ~ 28.6 mm |
| Length | 1 Meters to 28 Meters (92 feet) |
| Fin Material | CS (08F, SPCC), SS (SS304, SS316, 409, 410, 321, 347) |
| Fin Height | 8 mm ~ 35 mm |
| Fin Thick | 1 mm ~ 1.5 mm |
| Fin Pitch | 3 ~ 333 FPM (1 FPI ~ 7 FPI) |
| Fin Type | Solid, U Type, S Type, Serrated |
| Finned tube welding rate | more than 98% |
| Tube Ends | Plain cut or beveled at any degree |
Laser welded Fin Tube Coils Appearance Dimension Inspection
Finned tube coils appearance dimension inspection is one of the important links to ensure the quality and performance of fin tubes.
The inspection items mainly include fin height, fin spacing, fin thickness, base tube wall thickness and outer diameter, etc.
Datang Laser welded Fin Tube Coils Bending Processing
Bending of fin tubes is an important step in the production process of laser welded fin tube coils. Bending is to bend the finned tube coils material through specific mechanical equipment to form a suitable curvature to meet different usage requirements.
This step requires strict control of the bending angle and curvature to ensure the fit between the fin and the base tube and the heat dissipation effect.
Laser welded Fin Tube Coils Pull Off Test
Laser welded fin tube coils pull-off test is a test used to detect whether the fin tube will fall off when subjected to tension, mainly used to ensure the quality and reliability of the fin tube.
Datang’s this test is very important in the production process because the finned tube coils will be subjected to various stresses during operation, such as temperature changes and pipe expansion, which may cause the fin to fall off, thereby affecting the performance and safety of the heat exchanger .
