2A12 is a high-strength hard aluminum that can undergo heat treatment and strengthening. It has moderate plasticity in annealing, hard quenching, and hot states, good spot welding weldability, and a tendency to form intergranular cracks when using gas welding and argon arc welding; The alloy has good machinability after quenching and cold work hardening, but is poor in the annealed state. 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.