Aluminum

From Combat Robot

Aluminum is one of the most common materials used in combat robotics, used primarily in areas where light weight and strength are important factors. Its relatively low cost makes it an excellent choice for replacement parts, or the builder on a budget. There are many different alloys of aluminum, but there are three main choices among the community:

• 6061- A commonly available and relatively inexpensive alloy, 6061 has a mid-range capacity of all strength characteristics. Has a tendency to "gum up" on machining tools, and smear when hit by a kinetic energy weapon. Easiest to weld of these 3 alloys, weldable by MIG/GMAW and TIG.

• 7075- A member of the "aircraft alloys", as it's exceptional strength-to-weight ratio makes it a wise choice. A little more difficult to machine with smaller tools, but it is doable. It is weldable, but it requires more skill than welding 6061 and the end product is not as strong. TIG welding reccomended, not MIG.

• 2024- Another member of the "aircraft alloys". Very similar to 7075, so much infact that they can be interchanged in some instances. Welding is slightly more difficult than 7075, and can be slightly more brittle. Resistance welding and other less common processes are required for welding.

Aluminum may be anodized to give it a harder surface.