Table 2.

Parameters and levels selected through preliminary experiments.

S. No.	Parameters	Units	Range	Levels
				1	2	3	4	5
Coded Values				−2	−1	0	1	2
1.	Pulse-on Time (A)	(µs)	108–124	108	112	116	120	124
2.	Pulse-off Time (B)		42–58	42	46	50	54	58
3.	Spark Gap Voltage (C)	(volts)	24–72	24	36	48	60	72
4.	Wire Feed rate (D)	(m/min)	4–12	4	6	8	10	12