Aluminum alloy is the most widely used non-ferrous metal structural material in industry, which has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, chemical industry and other industries. With the rapid development of industrial economy, the demand for aluminum alloy welded structural parts is increasing, which makes the research on aluminum alloy weldability deepen. At present, the most widely used alloy is aluminum alloy.
Aluminum alloy has low density, but its strength is relatively high, close to or higher than that of high-quality steel. Good plasticity, can be processed into various profiles, and has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to steel.
Pure aluminum has a low density (ρ=2.7g/cm3), about 65,438+0/3 of that of iron, and a low melting point (660℃). Aluminum has a face-centered cubic structure, so it has high plasticity (ρ: 32-40%, ψ: 70-90%), is easy to process, and can be made into various profiles.