Table 7 Results of the surface roughness variance analysis for the first test
Parameter | Degrees of freedom (DF) | Sum of squares (SS) | Mean of squares (MS) | F value | P value | Degree of impact (rank) |
|---|---|---|---|---|---|---|
Voltage | 1 | 4.981 | 4.981 | 6.293 | 0.0405 | 2 |
Current | 2 | 65.833 | 32.916 | 36.268 | 0.0005 | 1 |
Pulse-on time | 2 | 3.107 | 1.554 | 1.627 | 0.2725 | 4 |
Pulse-off time | 2 | 3.825 | 1.913 | 2.029 | 0.2123 | 3 |