6061 aluminum is a precipitation aluminum alloy, containing magnesium, and silicon as its major alloying elements. This is the most versatile of the heat treatable aluminum alloys. It has most of the good qualities of aluminum, and it offers a wide range of mechanical properties and corrosion resistance. It can be fabricated by many of the commonly used techniques. This is more common in homemade aircraft, then in military or commercial aircraft. Some uses for tactical flash light, and bicycle frames. It can be welded by all methods and can be furnace brazed.