Mechanical and Formability Evaluation of ST14 Alloys Welded by Friction Stir Welding

Table 2

Optimal values predicted by the response level methodology model and alternative parameters.

	—	Predicted	Alternative and available
Criteria	Rotation speed (rpm)	39/866	800
	Pin diameter (mm)	92/3	9/3
	Linear velocity (mm/min)	74/78	80
	Holder diameter (mm)	26/14	2/14
Results	Tensile strength (MPa)	369/308	305