2A12 aluminum alloy is a high-strength hard aluminum that can be heat treated for strengthening; 2A12 aluminum alloy spot welding has good weldability, and there is a tendency to form intergranular cracks when using gas welding and argon arc welding; 2A12 aluminum alloy has good machinability after cold work hardening. The corrosion resistance is not high, and anodizing and painting methods or adding an aluminum coating on the surface are often used to improve the corrosion resistance.