Aluminum Alloy is divided into two categories: Cast Aluminum Alloy and wrought aluminum alloy. Deformation aluminum alloy can be divided into non-heat treatment reinforced aluminum alloy and heat treatment reinforced aluminum alloy. Non-heat-treatable strengthening type can not improve mechanical properties by heat treatment, but can only be strengthened by cold deformation, which mainly includes high-purity aluminum, industrial high-purity aluminum, industrial pure aluminum and rust-proof aluminum. Heat-treatable strengthened aluminum alloys can be classified into Duralumin, wrought aluminum, super-duralumin and special aluminum alloys by means of heat treatment such as quenching. At present, aluminum alloy is widely used in construction engineering structure and architectural decoration, such as roof frame, roof panel, curtain wall, door and window frame, movable partition wall, roof, radiator, balcony and staircase handrail and other interior decoration and architectural hardware. At the same time, the products of building aluminum are constantly updated, there are color aluminum plate, composite aluminum plate, composite door and window frame, aluminum alloy formwork and other novel building products are widely used in industrial and civil buildings