2A12 aluminum alloy is a kind of high-strength duralumin, can be strengthened by heat treatment; 2A12 aluminum alloy spot welding weldability is good, with gas welding and argon arc welding with the formation of intergranular crack tendency; 2A12 aluminum alloy in the cold hardening of the machinability performance is still good. Corrosion resistance is not high, often using anodic oxidation treatment and painting methods or surface cladding aluminum layer to improve corrosion resistance.