Fin tube heat exchangers are widely used in power, chemical, petrochemical, air conditioning, and refrigeration engineering.

Finned tube heat exchangers can be classified into two basic types based on their structural types: longitudinal and radial. According to the manufacturing process, finned tubes can be classified into integral finned tubes, welded finned tubes, high-frequency welded finned tubes, and mechanically connected finned tubes.
Integral finned tube, made by casting, machining or rolling, with fins and tubes as a whole.
Welded finned tubes are manufactured using processes such as brazing or inert gas shielded welding.
High frequency welded finned tubes use high-frequency electrical induction generated by a high-frequency generator to generate high temperatures at the contact between the tube surface and the fins. The two are melted within a depth range of about 10 μ m, and then pressurized to connect the fins with the tube as a whole. No flux or solder, simple manufacturing, high productivity, excellent heat transfer and mechanical properties. This is an ideal type of finned tube that is being recognized and adopted by a wide range of users.
There are usually three types of mechanically connected finned tubes: wound, embedded, sleeve, or string. The manufacturing of wound finned tubes is simple. The metal strip is mechanically or welded around one end of the tube, and the metal strip is tightly wrapped around the outer wall of the tube by the rotational torque of the tube. The other end is fixed to form a wound finned tube. The material for winding can be copper strip, steel strip, or aluminum strip.