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

Table 4

Design matrix.

Sl. no.	Parameter range						Tensile strength (MPa)
	Code			Actual			Actual value	Predicted value
	F	t	P	f	t	P
1	−1	−1	0	2	4	2.5	170.15	164.235
2	1	−1	0	4	4	2.5	182.2	181.115
3	−1	1	0	2	8	2.5	152.02	153.145
4	1	1	0	4	8	2.5	183.43	188.345
5	−1	0	−1	2	6	1.5	88.09	90.67
6	1	0	−1	4	6	1.5	156.8	155.55
7	−1	0	1	2	6	3.5	155.6	158.85
8	1	0	1	4	6	3.5	149.64	147.06
9	0	−1	−1	3	4	1.5	109.8	113.145
10	0	1	−1	3	8	1.5	128.1	124.435
11	0	−1	1	3	4	3.5	152.05	155.705
12	0	1	1	3	8	3.5	144.9	141.555
13	0	0	0	3	6	2.5	239	244.2
14	0	0	0	3	6	2.5	245	244.2
15	0	0	0	3	6	2.5	248.6	244.2