3004 aluminum sheet belongs to Al-Mn series alloy, is a kind of rust-proof aluminum sheet with a wide range of application. 3004 aluminum sheet has a low intensity(higher than pure aluminum), can not be strength by heat treatment, but its mechanical properties able to improved by cold processing technique. 3004 aluminum sheet has a good corrosion resistance, a good weldability but a poor cutting property, it has a high plasticity in annealed condition, and has a low plasticity in cold-work hardening. 3004 aluminum sheet is usually used in the low-load spare parts that work in liquid or gaseous media, and has the requirements of a high plasticity, good weldability, such as the mailbox, petrol or lube ducts, various liquid containers and other small load parts.
Aluminum alloy is one of the nonferrous materials that has a wide range of application in industry, and is widely used in aerospace, automobile, machinery manufacturing, shipping and chemical industry. As the rapid development of science, technology and industrial economy, the demand for aluminum alloy also increasing, as well as the development of welding technology has expand the application of aluminum alloy.