Aluminum alloy is one of the most widely used non-ferrous metal structural materials in the industry and has been widely used in aviation, aerospace, automotive, machinery manufacturing, marine and chemical industries. With the rapid development of science and technology and industrial economy in recent years, the demand for aluminum alloy welded structural parts is increasing, and the research on the weldability of aluminum alloys is also deepened. 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. Therefore, the welding technology of aluminum alloy is becoming one of the research hotspots.
The main elements of rust-proof aluminum alloys are manganese and magnesium.
(1) 3 series AL-Mn alloy, which is the most widely used rust-proof aluminum. This alloy has high strength, especially fatigue resistance: high plasticity and corrosion resistance, no heat treatment strengthening, semi-cold The plasticity is good when hardened, the plasticity is low during cold work hardening, the corrosion resistance is good, the weldability is good, the machinability is poor, and the polishing is possible. Uses are mainly used for low load parts requiring high plasticity and good weldability in liquid or gaseous media, such as fuel tanks, gasoline or lube oil conduits, various liquid containers and other small load parts made with deep drawing: The wire is used to make rivets.
(2) 5 series Al-Mg alloys, such as 5052 aluminum plates, which are widely used, especially in the construction industry, are the most promising alloys. Good corrosion resistance, excellent weldability, good cold workability and medium strength. The main alloying element of 5052 aluminum alloy is magnesium, which has good shape processing property, corrosion resistance, weldability and medium strength. It is used to manufacture aircraft fuel tanks, oil pipes, and sheet metal parts for transportation vehicles and ships, instruments and street lamp brackets. With rivets, hardware, electrical enclosures, etc.
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