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What is HFW solid finned tube?

HFW Solid Finned Tubes short for High Frequency Welded Helical Spiral Solid Finned Tube. HFW Solid Finned Tubes are manufacturer by helically wrapping and continuous weld fin strip on tube.

How to produce high frequency welded spiral finned tube?

High frequency welded spiral finned tube is to use the skin effect and proximity effect of high frequency current to heat the steel strip and the outer surface of the steel tube until the plastic state or melting, while the steel strip is wound around the steel tube. The welding is completed under a certain pressure when the steel strip is wound. This kind of high-frequency welding is a solid phase welding. Compared with inlay, brazing (or overall hot galvanizing) and other methods, it is more advanced in terms of product quality (high welding rate of fins, up to 95%), productivity and automation.

HFW Solid Finned Tube Size and material:

Tube O.D.:

16 to 273 (mm)

3/8” to 10”(NPS)

Tube Wall Thk.:

2 to 28.6 (mm)

0.08” to 1.1”

Tube Length:

≤28,000 (mm)

≤92 ft

Fin Thk.:

0.5 to 3.5 (mm)

0.02” to 0.14”

Fin Height:

8 to 35 (mm)

0.31” to 1.3”

Fin Pitch:

3 to 333 FPM

1 to 8 FPI

Fin Type:

Solid, “U”or“V” Serrated

Fin Material:

C.S. (most common grade: 08F, SPCC)

S.S. (most common grade are AISI 304, 316, 409, 410, 321,347 )

Tube Material:

C.S. (most common grade: A106 Gr.B, A210, A192)

S.S. (most common grade are TP304, 316, 321, 347 )

A.S.(most common grade are T/P5,9,11,22,91 )

Duplex Steel (most common grade are 2205 etc. )

Helical Solid Finned Tubes are manufacturer by helically wrapping continuous fin strip on tube. HF Resistance Welding Usually Employs Frequency Of 400 kHz. The fin wound around the tube And Continuous weld. The fin strip is wounded spirally onto the tube and welded continuously with a high frequency electrical process to the base tube along the spiral root. The fin strip held under tension and confined laterally as it is formed around the tube, thereby ensuring that the strip is in forceful contact with the base tube surface. A continuous weld is applied at the point where the fin strip first begins to bend around the tube diameter, using the gas metal arc welding process.

For a given tube or pipe size, the desired heat transfer surface area per unit length of tube can be obtained by specifying the appropriate fin height, fin thickness and /or number of fins per meter of length.  

Characteristics of High Frequency Welded Solid Finned Tubes

1. Because of fast welding speed and strong self cooling effect of weldments, not only the heat affected zone is small, but also oxidation is not easy to occur, so the microstructure and properties of the weld are very good.

2. Corrosion resistance, abrasion resistance, low contact thermal resistance, high stability, and anti ash ability.

3. Large heat exchange area.

HFW Solid Finned Tube Advantages:

1. The welded steel finned tube configuration can be used for any practically heat exchanger application, and is particularly suited to high temperature and high pressure applications.   The important features of this configuration are efficient, effective bond of fin to tube under all conditions of temperature and pressure, and ability to withstand high fin-side temperatures.

2. A continuous helical fin is attached to the base tube by high frequency electric resistance welding in order to give an efficient and thermally reliable bond.

3. High frequency welded helical spiral solid finned tube provide the designer with high thermal efficiency and compact design solutions for a whole range of heat exchangers where clean flue gases are used. Helical finned Tubes are manufactured in both Solid and Serrated type.

High Frequency Welded Solid Fin Tube Applications: 

1. The High Frequency Welded Solid Fin Tube have been widely used in heat recovery of boiler economizers, air preheaters and waste heat boilers, as well as heat exchangers in various fields such as chemical and pressure vessels.

2. High Frequency Welded Solid Fin Tube is also widely used in waste heat recovery of electric power, metallurgy, cement industry and petrochemical industry.

In order to forward you a promt offer we would be pleased to receive you detailed enquiry including:

• Base tube material

• Base tube size (OD x WT x Length)

• Fin material

• Fin type

• Fin diameter or height

• Fin thickness

• Fins per inch, meter or fin pitch

• Lenght of plain, unfinned ends

• Finned Tube Quantity

(Additional fabrication, such as bend or weld the tubes into tubeplate or assembly)

HFW Solid Finned Tube, High Frequency Welded Solid Fin Tube

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