Aluminum to aluminum-based alloy general. The main alloying elements are copper, silicon, magnesium, zinc, manganese, minor alloying elements are nickel, iron, titanium, chromium, lithium. Aluminum low density, but the intensity is relatively high, close to or more than high quality steel, plastic, can be processed into a variety of profiles, with excellent electrical conductivity, thermal conductivity and corrosion resistance, widely used in industry, usage after the steel .

　　Aluminum alloy commonly used elements copper, zinc, manganese, silicon, magnesium, etc., in the early 20th century, invented by the German Alfred Wilm, greatly helped the development of the aircraft, after World War I German aluminum components are classified as a state secret. Compared with ordinary carbon steel is lighter and corrosion performance, but not as good corrosion resistance of aluminum. Protective oxide layer in a clean, dry environment aluminum surface will form.

　　Circumstances cause galvanic corrosion (Galvanic corrosion) acceleration are: the case of aluminum and stainless steel contact corrosion potential is lower than other metals aluminum, or in a wet environment. If you want to use with aluminum and stainless steel must have a water-containing systems or outdoor installation between two metal electronic or electrolytic isolation.

　　Aluminum components need to Alcoa Association (Aluminium Association, AA) registration. Many organizations publish more specific aluminum manufacturing standards, including the American Society of Automotive Engineers (Society of Automotive Engineers, SAE) especially aviation standards, as well as ASTM (American Society for Testing and Materials, ASTM).

　　Aluminum is the industry's most widely used non-ferrous structural materials in aviation, aerospace, automotive, machinery manufacturing, shipbuilding aluminum

　　And the chemical industry has a lot of applications.

　　With the recent rapid development of science and technology as well as the industrial economy, the demand for aluminum alloy welded structure is increasing, so that the welding of aluminum along with in-depth research. Aluminum is widely used to promote the development of aluminum welding technology, welding technology development and also expand the applications of aluminum, aluminum welding technology is becoming one of the hot research.

　　Density of pure aluminum (ρ = 2.7g / cm3), about 1/3 of iron, low melting point (660 ℃), aluminum is face-centered cubic structure, it has a high plasticity (δ: 32 ~ 40%, ψ: 70 ~ 90%), ease of processing, can be made into a variety of profiles, sheet metal. Good corrosion resistance; but the low strength of aluminum, annealed σb value of approximately 8kgf / mm2, it is not suitable for structural materials. Through long-term production practice and scientific experiments, gradually adding alloying elements and heat treatment and other methods to strengthen the aluminum, which has been a series of aluminum alloy.

　　Adding some elements to form the alloy while maintaining the advantages of lightweight aluminum while having high strength, σb values of up to 24 ~ 60kgf / mm2. This makes the "specific strength" (strength and weight ratio σb / ρ) is better than a lot of steel, an ideal structural material, widely used in machinery manufacturing, transportation machinery, power machinery and aviation industries, the aircraft fuselage , skin, compressor, etc. often aluminum to reduce weight. Using aluminum instead of steel materials welding, structural weight can reduce more than 50%.

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