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. Sheet metal is less than .249” thick and is useful for manufacturing packages. This is more common in homemade aircraft, then in military or commercial aircraft. It can be welded by all methods and can be furnace brazed.