Grey relational analysis, Technique for Order of
Preference by Similarity to Ideal Solution and hybrid
Technique combining Order of Preference by Similarity to Ideal
Solution and Grey Relational Analysis are used to optimize
process parameters of friction stir welded Aluminum 6061 pipes
for greater tensile strength and hardness. These statistical
approaches are known for solving multi objective problems
where in this case, multi objective tensile strength and hardness
are optimized with respect to friction stir welding parameters
such as rotational speed, travel speed and tool pin diameter. The
design of experiments were designed using Taguchi- L27
orthogonal array and responses such as tensile strength and
hardness is evaluated for each set of parameters. The results
from three statistical approaches converged to a single
the optimized set of parameters – 1800 rpm rotational speed, 5 mm
pin diameter and 20 mm/min travel speed.