Influence of Process Parameters on Tensile Strength of the Friction Welded AA6063-T6 Joints by Box–Behnken Design Approach

Table 5

Statistical data.

Source	Tensile strength (MPa)
Model	Quadratic model
	p value (<0.0005)	F Value (88.89)
F	0.0018	Lack of fit	0.3934
T	0.7574	R^2	0.9938
P	0.0014	Adjustable R^2	0.9826
	0.1796	Predicted R^2	0.9215
	0.0018	Adequate precision	30.34
	0.0953	—	—
f^2	0.0001	—	—
t^2	<0.0001	—	—
p^2	<0.0001	—	—