*Levels

S/N ratio

Rotational Speed

(rpm)

Welding Speed

(mm/min)

Axial Load (kN)

1

33.85

32.72

33.03

2

32.23

34.67

33.71

3

34.60

33.28

33.93

Max-min

2.37

1.95

0.89

Rank

1

2

3