Arc Machines 307 - Manual (Page 139)

Arc Machines, Inc. Model 307 Orbital Tube Welder Training
Document No. 740096 Chapter 13. Page 6
Rev. A
Tungsten Electrode Installation in Weld Head
Electrodes are machined to a specific length for each weld head/weld O.D.
combination. It is thus very important to install the electrode properly in
order to achieve the correct arc gap. For rotors which have a through hole,
including most Model 9 weld heads, the electrode must be installed flush to
the rotor O.D. Note that some rotors have different diameter holes to accom-
modate the different electrode diameters.
The Model 8 weld heads and Model 9-500 and 9-250 series weld heads have
electrode holes that only go part way through the rotor. Electrodes in these
heads must be installed from the I.D. and be fully seated in the hole.
Electrode in the Model 9-1500 weld head is installed
from the O.D. and must be flush with the rotor O.D..
Electrode is installed from the I.D. on the Model 8
series weld heads and must go all the way in.