*Levels

Mean

Rotational Speed

(rpm)

Welding Speed

(mm/min)

Axial Load (kN)

1

49.68

43.74

45.39

2

41.20

54.31

49.47

3

53.71

46.54

49.73

Max-min

12.50

10.57

4.34

Rank

1

2

3