Doc No. 740123
10
MODEL 8 SERIES WELD HEAD
OPERATION MANUAL
7.0 ELECTRODE GEOMETRY & INSTALLATION
(cont’d.)
Use this chart to determine the Rotor O.D.
Model
Rotor O.D.
8-2000
3.452” (87.68mm)
8-4000
5.310” (134.87mm)
8-6625
8.094” (205.59mm)
Fig. 7
Use this chart to establish an appropriate Arc Gap and Electrode Tip diameter
Tube/Pipe Wall
Thickness
Recommended
Arc Gap
Recommended Tip
Diameter
0.020”–0.035” (.5 –1.0mm)
0.020”-0.030” (0.5-0.8mm)
0.010”-0.20” (.25-.50mm)
0.035”-0.085” (1.0-2.1mm)
0.050”-0.070” (1.3-1.8mm)
0.030” (0.8mm)
0.091”-0.154” (2.3-3.9mm)
0.070”-0.090” (1.8-2.3mm)
0.040” (1.0mm)
Fig. 8
Use the formula below along with your Rotor O.D. and Arc Gap to establish the
electrode length.
Fig. 9
