Bi-objective Optimization of Process Parameters in Electric Discharge Machining of SS630 Using Grey Relation Analysis

Table 3

Input control variables with their corresponding levels.

Parameter	No. of levels
	Level 1	Level 2	Level 3	Level 4
(A)	6	10	14	18
(μs)	15	25	35	45
(μs)	20	50	70	90
(Mpa)	2	4	6	8