Aluminum alloyis a kind of nonferrous metallic building materialwidely used in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipping and chemical industry.With the rapid development of industrial economy, the demand for welding structural parts of aluminum alloy is increasing day by day, which makes the research on weldability of aluminum alloy further.At present, aluminum alloy is the most widely used alloy.

The ALUMINUM ALLOY INGOTdensity is low, but the strength is relatively high, approximates or surpasses the high quality steel, the plasticity is good, may process into each kind of profile, has the fine conductivity, the thermal conductivity and the corrosion resistance, in the industry widely USES, the usage quantity is second only to the steel.Some ADC12 ALUMINUM ALLOY INGOTcan be heat treated to obtain good mechanical properties, physical properties and corrosion resistance.Hard aluminum alloy belongs to AI - Cu - Mg system, generally contains a small amount of Mn, heat treatment can be strengthened.It is characterized by high hardness but poor plasticity.Superdural belongs to Al - Cu - Mg - Zn series, which can be intensified by heat treatment. It is the strongest aluminum alloy at room temperature, but has poor corrosion resistance and fast softening at high temperature.Forging aluminum alloy is mainly Al - Zn - Mg - Si alloy, although adding more kinds of elements, but the content is small, so it has excellent thermoplasticity, suitable for forging, so it is also called forging aluminum alloy.


All kinds of aircraft use aluminum alloy as the main structural material.The skins, beams, ribs, trusses, compartments and landing gear of aircraft can all be made of aluminum.The amount of aluminum used in an aircraft varies, depending on its purpose.The aluminum alloy used in Boeing 767 passenger plane accounts for about 81% of the body structure weight.For example, the f-15 high performance fighter with a maximum flight speed of Mach 2.5 only USES 35.5% aluminum alloy.Some aluminum alloys have good low temperature performance, at -183 ~ -253[2oc] is not cold and brittle, can work in liquid hydrogen and liquid oxygen environment, it does not react with concentrated nitric acid and partial dimethylhydrazine, has good welding performance, therefore it is a good material for making liquid rockets.The fuel tanks, oxidizer tanks, intertank, interstage, tail and instrument compartments of the Saturn 5 launch vehicle that launched the Apollo spacecraft were all made of ALUMINUM ALLOY INGOT.

The crew compartment, forward fuselage, middle fuselage, aft fuselage, vertical tail, flaps, elevons, and horizontal tail are all made of aluminum.The main structural material of various man-made earth satellites and space probes is also aluminum.

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