Optimization and Characterization Studies of Dissimilar Friction Stir Welding Parameters of Brass and Aluminum Alloy 6063 Using Taguchi

Table 5

Model significance of hardness using ANOVA.

Sources	DF	Seq SS	Adj SS	Adj MS	F		Percentage contribution
Ntool (rpm)	2	6.3785	6.3785	3.1893	9.74	0.001	28.98
Tpreheat (^oC)	2	2.4096	2.4096	1.2048	3.68	0.046	10.95
Straverse (mm/min)	2	2.4207	2.4207	1.2104	3.70	0.045	11.0
Ppin	2	4.9096	4.9096	2.4548	7.50	0.004	22.30
Error	18	5.8933	5.8933	0.3274			26.77
Total	26	22.0119					100

Note. DF, degrees of freedom; Seq SS, sequential sums of squares; Adj SS, adjusted sum of squares; Adj MS, adjusted mean square; F test of hypothesis, value of hypothesis (significant at 95% confidence level).