Aluminum alloy is a general term for aluminum based alloy. The main alloying elements are copper,
silicon, magnesium, zinc, manganese, minor alloying elements are nickel,iron, titanium, chromium,
lithium, etc..Aluminum alloy is one of the most widely used non-ferrous metal structure materials,
which has been widely used in aviation, spaceflight,automobile, machinery manufacturing, shipbuilding
and chemical industry. With the rapid development of science and technology and industry economy in
recent years, the demand for aluminum alloy welding structure is increasing, so the research on the
welding of aluminum alloy will be further developed. The wide application of aluminum alloy promotes
the development of aluminum alloy welding technology, and the development of welding technology has
expanded the application field of aluminum alloy, so the welding technology of aluminum alloy is
becoming one of the hot spots.
The density of the pure aluminum small (P =2.71g/cm3), about one-third of the iron, low melting point
(660 DEG C), aluminum is face centered cubic structure, so it has a high plasticity, easy processing
can be made into various shapes, plates. Good corrosion resistance, but the strength of pure aluminum
is very low, so it is not suitable for structural materials. Through the long-term production practice and
scientific experiments, people gradually added to the alloy elements and the use of heat treatment and
other methods to strengthen the aluminum, which got a series of aluminum alloy. Add some elements to
form the alloy also has high strength while maintaining the advantages of pure aluminum and etc..
So that its "strength" (intensity and the proportion of the ratio of sigma B / P)ratio is better than a lot
of alloy steel, become the ideal structural material, widely used in machinery manufacturing, transport
machinery, power machinery and aviation industry and other aspects, the fuselage of the aircraft, a skin,
a compressor often to aluminum alloy metal manufacturing, in order to reduce weight. Using aluminum
alloy instead of steel plate material, the structure can be reduced by more than 50%.
Aluminum alloy with low density, but the strength is relatively high, close to or more than high quality
steel, plastic, can be processed into a variety of profiles, with good electrical conductivity, thermal
conductivity and corrosion resistance, widely used in industry, the use of only in steel.