The reason why aluminum alloy pipeline is widely used in industry

Aluminum alloy pipe, containing corrosive gases in the atmosphere, water vapor, hydrocarbons and other impurities, per cubic meter of mixed with about 140 million solid particles in the air, the solid particles with compressed air in the oil and water vapor into the compressed air pipe network system, such as using the traditional galvanized pipe or carbon steel pipes, pipe wall will rust, long exposure in the air, surface of iron oxide rust, make the iron becomes soft and loose.

Ordinary carbon steel pipe used for a long time will naturally have corrosion impurities deposited inside the pipe. The result is that the pipeline (including the welding spot) corrodes, penetrates and leaks, and the polluted air brings serious harm to the quality of pneumatic equipment, pneumatic instruments and terminal products, which increases the maintenance cost of system equipment, and wastes a lot of money for the reason of leakage. Aluminium alloy density is low, but intensity is higher, close to or exceed high grade steel, plasticity is good, can be machined into all sorts of profile, have good conductance, conduction of heat and anticorrosive sex, use extensively on industry, use amount is next to steel.

Aluminum alloy pipeline, some aluminum alloy can adopt heat treatment to obtain good mechanical properties, physical properties and corrosion resistance. Durium alloy belongs to AI - Cu - Mg system, generally contains a small amount of Mn, can be strengthened by heat treatment. It is characterized by high hardness but poor plasticity. Connect the pipeline of the integrated mixing and towing pump, usually 2~3 people cooperate with the device with higher power. When installing the pipeline, it should first check whether the pipeline is made of the residual concrete from the previous construction and whether it is cleaned in place. Otherwise, the concrete will simply be blocked when it is transported. It is also important to have an accurate receiving sequence, or the concrete mixer will simply cause the pipe to crack from the joint during pumping.

The main welding pores of aluminum and aluminum alloy are hydrogen pores. Aluminum can absorb and dissolve a large amount of hydrogen in liquid state, with a solubility of 0.0069ml/g in the molten state and 0.00036 ml/g in the high-temperature solidification state, with a difference of nearly 20 times. The thermal conductivity of aluminum is very large. Under the same welding process, the cooling speed of aluminum is 4 ~ 7 times that of steel, which accelerates the crystallization of metal. During the rapid cooling process of welding pool, the solubility of hydrogen drops sharply, and a large amount of susaturated gas is precipitated at this time, and hydrogen is too late to precipitate and form pores in weld metal. Therefore, when welding aluminum, the tendency of porosity is very big.

Aluminum alloy pipeline buried laid pipeline, must pay attention to soil corrosion and seepage problems, through the inconvenient excavation of the road, the use of casing, to ensure the life of the pipeline; Use elbow as little as possible, elbow too much will cause the compressed air flow rate down, increase the air compressor load; The connection of dalian compressed air pipeline can ensure the leakage in the conveying process is small.