Sheet metal fabrication involves various materials, including aluminum, stainless steel, copper, brass, and titanium. Among these, aluminum and stainless steel are most commonly used due to their durability, resistance to corrosion, and ease of fabrication. Copper and brass are favored for their electrical conductivity and aesthetic appeal, while titanium is chosen for its strength-to-weight ratio and corrosion resistance. These materials are selected based on the specific requirements of the project, including strength, weight, conductivity, and resistance to environmental conditions.