2A12 aluminum alloy is a kind of high-strength hard aluminum, which can be heat-treated and strengthened; 2A12 aluminum alloy has good spot weldability, and there is a tendency to form intergranular cracks when using gas welding and argon arc welding; 2A12 aluminum alloy can be cut after cold work hardening Performance is still good. The corrosion resistance is not high, and the anodizing treatment and painting method or the surface is coated with an aluminum layer to improve the corrosion resistance2A11 aluminum alloy|The earliest kind of hard aluminum, generally called standard hard aluminum, has medium strength, good plasticity in annealing, quenching and hot state, heat treatment strengthening, use in quenching and natural aging conditions, point Good weldability, cracking tendency during gas welding and argon arc welding; cutting is good in quenching and aging, and poor in annealing.