Aluminum alloy is the most widely used type of non-ferrous metal structure material in industry. It has been widely used in aviation, aerospace, automotive, machinery manufacturing, shipbuilding and chemical industries. The rapid development of the industrial economy has increased the demand for aluminum alloy welded structural parts, which has made the research on the weldability of aluminum alloy intensified. Aluminum alloy is the most commonly used alloy.
Aluminum alloy has low density but high strength. It is close to or exceeds high-quality steel. It has good plasticity and can be processed into various profiles. It has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to steel. . Some aluminum alloys can be heat treated to obtain good mechanical properties, physical properties and corrosion resistance. The hard aluminum alloy belongs to the AI-Cu-Mg series and generally contains a small amount of Mn, which can be strengthened by heat treatment. It is characterized by high hardness but poor plasticity. Super-hard aluminum belongs to the Al-Cu-Mg-Zn series, which can be strengthened by heat treatment. It is the strongest aluminum alloy at room temperature, but has poor corrosion resistance and rapid softening at high temperatures. Forged aluminum alloys are mainly Al-Zn-Mg-Si series alloys. Although there are many types of added elements, the content is small, so they have excellent thermoplasticity and are suitable for forging. Therefore, they are also called forged aluminum alloys.