[Retracted] Experimental Investigation and Optimization on Friction Stir Welding of Nylon 6A Using Taguchi and ANOVA with Microstructural Analysis

Table 7

Response for ratios of hardness.

Level	TRS	Feed rate	Pitch
1	37.61	38.45	38.59
2	38.81	38.30	38.38
3	39.12	38.80	38.57
Delta	1.51	0.51	0.21
Rank	1	2	3