Factor

Process

parameters

Sum of squares

Degrees of freedom

Mean sum of squares

F-test

A

Rotational speed

8.821

2

4.41

17.68

B

Welding speed

6.071

2

3.035

12.17

C

Axial load

1.308

2

0.654

2.62

Error

0.498

2

0.249

Total

16.700

8