Table 2 Central composite design matrix (CCD)
Std | Weld runs | Block | Current | Voltage | Gas flow rate |
|---|---|---|---|---|---|
12 | 1 | Block 1 | 250.23 | 23.5 | 13.5 |
16 | 2 | Block 1 | 225 | 26 | 14.5 |
10 | 3 | Block 1 | 250.23 | 24.5 | 14.5 |
19 | 4 | Block 1 | 240 | 25 | 16 |
6 | 5 | Block 1 | 225 | 25 | 16 |
13 | 6 | Block 1 | 240 | 20.98 | 13.5 |
9 | 7 | Block 1 | 199.77 | 24.5 | 13.5 |
18 | 8 | Block 1 | 210 | 25 | 16 |
15 | 9 | Block 1 | 199.77 | 26 | 11.98 |
14 | 10 | Block 1 | 250.23 | 20.98 | 13.5 |
3 | 11 | Block 1 | 240 | 22 | 11.98 |
11 | 12 | Block 1 | 225 | 24.5 | 11.98 |
5 | 13 | Block 1 | 210 | 22 | 16 |
7 | 14 | Block 1 | 199.77 | 23.5 | 14.5 |
20 | 15 | Block 1 | 210 | 20.98 | 14.5 |
8 | 16 | Block 1 | 225 | 22 | 13.5 |
2 | 17 | Block 1 | 199.77 | 26 | 11.98 |
17 | 18 | Block 1 | 240 | 20.98 | 13 |
4 | 19 | Block 1 | 210 | 22 | 16 |
1 | 20 | Block 1 | 250.23 | 22 | 11.98 |