Laser-welded finned tubes
utilize a high-energy laser beam for continuous fusion welding between the tube and fins, ensuring high joint strength, minimal thermal resistance, and excellent temperature/corrosion resistance – ideally suited for efficient heat exchange under high-temperature, high-pressure, or corrosive conditions.
High-frequency welded finned tubes
utilize the skin effect and proximity effect of high-frequency current to rapidly heat the contact interface between the tube and fins to a plastic state, then apply pressure to achieve a solid-state bond. Featuring high welding speed, a narrow heat-affected zone, and excellent production efficiency, they are widely used in cost-effective heat exchange applications such as boiler economizers, air coolers, and general industrial thermal systems.
Extruded finned tubes
are manufactured via an integral cold-extrusion process that forms spiral fins directly from the outer wall of the base tube, creating a homogeneous structure without any weld joints or interfacial thermal resistance. They offer high heat transfer coefficients, superior mechanical strength, and excellent resistance to thermal shock and vibration fatigue – making them especially suitable for applications with low gas-side heat transfer coefficients, such as air heaters, waste heat recovery systems, and air coolers in the petrochemical industry.
U-bent finned tubes
are produced by bending pre-manufactured finned tubes (typically laser-welded, high-frequency welded, or extruded types) into a U-shaped configuration, enabling fluid turnaround and two-pass heat exchange paths within a compact footprint. They feature a space-saving design, excellent tube-side sealing integrity, and easy end-plate connections – making them especially suitable for space-constrained heat exchange modules, in-vessel coil heaters, and applications with large temperature differentials requiring thermal expansion compensation.