Characteristics: It is a kind of high strength duralumin, which can be strengthened by heat treatment, moderate plasticity in annealing, hardening and hot state, good spot welding welding, gas welding and argon arc welding aluminum tube has the tendency to form intercrystalline cracks; The machinability of aluminum tube is good after quenching and cold work hardening, but poor when annealed. The corrosion resistance is not high. Anodic oxidation treatment and coating method or aluminum coating is often used to improve the corrosion resistance. It can also be used as a mold material.

Advantages of aluminum tube: ① Welding technology: suitable for industrial production of thin-wall copper and aluminum tube welding technology, known as a world-class problem, is the key technology of air conditioner connecting pipe aluminum instead of copper.

② Service life advantage: From the perspective of the inner wall of the aluminum tube, because the refrigerant does not contain moisture, the inner wall of the copper-aluminum connecting tube will not be corroded.

③ Energy saving advantage: the connection pipe between indoor unit and outdoor unit of air conditioner, the lower the heat transfer efficiency, the more energy saving, or the better the insulation effect, the more electricity saving.

④ Excellent bending performance, easy to install, move machine.

Surface treatment:① Chemical treatment: oxidation, electrophoresis coating, fluorine carbon spraying, powder spraying, wood grain transfer printing.②Mechanical treatment: mechanical drawing, mechanical polishing, sand blasting