2A12 aluminum alloy is a kind of high-strength hard aluminum, which can be strengthened by heat treatment; 2A12 aluminum alloy has good weldability in spot welding, and has a tendency to form intergranular cracks when gas welding and argon arc welding are used; 2A12 aluminum alloy can be machinable after cold work hardening The performance is still good. The corrosion resistance is not high, and anodic oxidation treatment and painting methods are often used to improve the corrosion resistance.

2A14 is a hard aluminum alloy and a wrought aluminum alloy in terms of composition. Compared with 2A50, because of its higher copper content, it has higher strength and better thermal strength, but its plasticity in a hot state is not as good as 2A50. It has good machinability, good performance in contact welding, spot welding and roll welding, but poor in arc welding and gas welding; it can be strengthened by heat treatment and has extrusion effect; it has low corrosion resistance and tends to corrode between inspections during artificial aging.