Aluminum tube is a kind of high-strength hard aluminum, which can be strengthened by heat treatment. It has medium plasticity under annealing, rigid quenching and thermal conditions, and excellent spot welding. When gas welding and argon arc welding are used, aluminum tube tends to form intergranular cracks; The machinability of aluminum tube after quenching and cold work hardening is good, but it is poor in annealing condition. The corrosion resistance is not high. Anodizing and painting methods or aluminum coating on the surface are often used to improve the corrosion resistance. It can also be used as mold material.

　　Advantages of aluminum tube:

　　First, the advantages of welding skills: the welding skills of thin-walled copper aluminum tubes suitable for industrialized production are the hub skills of replacing copper with aluminum for air conditioner connecting tubes.

　　Second, the advantage of service life: from the inner wall of aluminum pipe, because the refrigerant does not contain water, the inner wall of copper aluminum connecting pipe will not produce corrosion.

　　Third, energy-saving advantages: the lower the heat transfer power, the more energy-saving, or the better the thermal insulation effect, the more power-saving.

　　Fourth, it has excellent zigzag function and is easy to install and move.

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