Source

Sum of Squares

df

Mean Square

F-value

p-value

Model

5836.6

9

648.51

16.1

<0.0001

significant

A-Welding Current

873.47

1

873.47

21.68

0.0009

B-Welding Voltage

909.73

1

909.73

22.58

0.0008

C-Gas Flow Rate

479.55

1

479.55

11.9

0.0062

AB

126.51

1

126.51

3.14

0.1068

AC

340.57

1

340.57

8.45

0.0156

BC

533.04

1

533.04

13.23

0.0046

A²

2399.52

1

2399.52

59.56

<0.0001

B²

107.94

1

107.94

2.68

0.1327

C²

296.85

1

296.85

7.37

0.0218

Residual

402.85

10

40.28

Lack of Fit

159.88

5

31.98

0.658

0.6714

not significant

Pure Error

242.97

5

48.59

Cor Total

6239.45

19