5083H116 aluminum tubes can be divided into the following categories according to shape divided: the tube, pipe, tube pattern, shaped by extrusion points: seamless tubes and ordinary extruded tubes by Accuracy Score: ordinary aluminum tubes and precision tubes, precision tubes which generally require reprocessing after extrusion, such as cold-drawn precision smoke rolling press thicknesses: ordinary aluminum and thin-walled tubes Performance: corrosion resistance, light weight. Characteristic of a high-strength aluminum hard, can be heat strengthened, in the annealed, hardened and thermal state just plasticity medium, spot welding is good, gas welding and aluminum welding time has a tendency to crack formed between crystal; aluminum tube after quenching and work hardening can be cutting is still good, bad in the annealed state. Corrosion resistance is not high, often with anodized and painted or surface plus clad layer method to improve corrosion resistance. It can also be used as a mold material. Aluminum advantages: First, welding technology advantages: suitable for industrial production of thin-walled copper and aluminum pipe welding technique, known as the world-class problems, is the key technology to connect the air conditioner aluminum and copper pipe. Second, the life of advantages: from the inner wall of tubes, due to the refrigerant without water, copper-aluminum connecting tube wall corrosion does not occur. Third, energy-saving advantage: air conditioner indoor unit and outdoor unit connecting pipe, the lower the energy efficiency of heat transfer efficiency, or that the more power the better the insulation. Fourth, good bending performance, easy installation, transfer machines use aluminum is widely used in various industries, such as: cars, ships, aerospace, aviation, electronics, agriculture, electronics, home, etc., aluminum in our lives have become ubiquitous The basic state is divided into five kinds of Code Name Description and Application F free processing state applies in the molding process, hardening and heat treatment conditions for no special requirements for products, the mechanical properties of the state of the product is not specified. O annealed condition applies fully annealed to obtain a minimum strength of processed products. H hardening state applies through hardening to increase the strength of the product, the product may be subjected to after hardening (or not been) reduced the strength of the additional heat treatment. W solid solution heat treatment processing status of an unstable state, only apply to the solution heat treatment, the natural aging of the alloy at room temperature, the state code only that the product is natural aging stage. T heat treatment (unlike F, O, H state) applied to the heat-treated, after (or without) hardening to achieve a stable product. T code must be followed by one or more digits. In the first digit represents the back of the T heat treatment basic types (from 1 to 10), followed by the digits represent change in the heat treatment details. Such as the 6061-T 62; 5083-H 343 and so on. T1- from the molding temperature cooled and naturally aged to a substantially stable condition. T2- annealed condition (only for casting). T3- natural aging after solution treatment. T31- cold solution treated (1%) after natural aging. T36- cold solution treatment (6%) after natural aging. T37- cold solution treatment (7%) after natural aging for 2219 alloy. T4- natural aging after solution treatment. T41- ??boiling water quenched after solution treatment. T411- air-cooled to room temperature after solution treatment, hardness between O and T6, low residual stress. T42- natural aging after solution treatment. By the user process, suitable for 2024 alloy, strength slightly lower than T4. T5- from the molding temperature of the cooling artificial aging. T6- solution treatment after artificial aging. T61-T41 + artificial aging. T611- solution treatment, boiling water quenching. T62- solution treatment after artificial aging. T7- after solution treatment stabilized. Improve the dimensional stability, reduce the residual stress and improve corrosion resistance. T72- overaged after solution treatment. T73- graded aging after solution treatment, T6 low intensity ratio, corrosion resistance was significantly improved. T76- graded aging after solution treatment. T8- cold artificial aging after solution treatment. T81- cold after solution treatment, artificial aging. In order to improve the deformation after solution treatment and improve strength. T86- cold after solution treatment (6%), artificial aging. T87-T37 + artificial aging. T9- artificial aging after solution treatment and then cold. T10- from the molding temperature of the cooling, after artificial aging cold. Tx51- to eliminate the residual stress of stretching after solution treatment process. Sheets of 0.5 to 3% permanent deformation, rods, profiles 1-3% permanent deformation. X represents 3,4,6 or 8, for example T351, T451, T651, T851, suitable for plates, drawn rods, wire, stretch after the elimination of stress and aging without any correction. T3510, T4510, T8510, suitable for extrusion, stretching eliminate stress to make flatness tolerances in line with the correction, and aging. Tx52- to eliminate residual stress after solution treatment of compression deformation, for 2.5% of the plastic deformation and aging after solution treatment, such as T352, T652. Tx53- eliminate thermal stress. Tx54- precision forgings for the elimination of residual stress after solution treatment compression deformation.