 It has good mechanical properties, exhibits good weldability, and is very commonly extruded (second in popularity only to 6063).It is one of the most common alloys of aluminum for general-purpose use.It is commonly available in pre-tempered grades such as 6061-O (annealed), tempered grades such as 6061-T6 (solutionized and artificially aged) and 6061-T651 (solutionized, stress-relieved stretched and artificially aged).