This document discusses aluminum extrusion, including the extrusion process, alloy selection, heat treatment designations, and design considerations. Common aluminum alloys for extrusion include 6063 and 6061 due to their corrosion resistance, weldability, and mechanical properties. The extrusion process is used to create solid, semi-hollow, and hollow aluminum sections for a variety of applications. Proper alloy selection and heat treatments are important to achieve the desired material performance.