Aluminum alloy structures commonly include the following:

1. Aluminum alloy profiles: Aluminum alloy profiles are widely used in industries such as construction, transportation, and machinery. They typically have complex cross-sections and lightweight designs, making them easy to machine into various shapes.
2. Aluminum alloy sheets: Aluminum alloy sheets are commonly used to manufacture thin-walled parts, such as housings, base plates, and enclosed structural components. These sheets can be processed through techniques like laser cutting, stamping, and bending.
3. Aluminum alloy castings: Aluminum alloy castings are produced through casting processes and are suitable for parts requiring complex shapes and good strength, such as engine components, transmission parts, and frame structures.
4. Aluminum alloy welded structures: Aluminum alloy structures connected through welding are widely used in automotive, aerospace, and shipbuilding industries. Welding is used to create frames, hulls, and other load-bearing structures.
5. Aluminum alloy composite materials: These structures combine aluminum alloy with other materials (such as plastics or carbon fiber) to enhance strength, rigidity, and corrosion resistance, and are often used in high-end applications like aerospace and high-performance sports equipment.

The machining processes for aluminum alloys typically include cutting, milling, drilling, and grinding to achieve the required precision and surface quality. It is also crucial to select the appropriate tools, cutting speeds, and feed rates based on the characteristics of the aluminum alloy.