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5-4. Lift-Arc TIG Procedure
5-5.
Optional Low Open Circuit Voltage (OCV) Welding Modes
OM-234 199 Page 22
1
1 − 2
"Touch"
Seconds
Do NOT Strike Like A Match!
2
Low OCV Operation
The unit can be optionally configured for low open
circuit voltage (OCV) operation in Stick and
Scratch Start TIG modes. When the unit is config-
ured for low OCV operation only a low sensing
voltage (approximately 15 VDC) is present be-
tween the electrode and the workpiece prior to the
electrode touching the workpiece. Consult a
Factory Authorized Service Agent for information
regarding how to configure the unit for low OCV
welding operation.
With Process Switch in the Lift-Arc
TIG position, start an arc as follows:
1
TIG Electrode
2
Workpiece
Touch tungsten electrode to work-
piece at weld start point, hold
electrode to workpiece for 1-2
seconds, and slowly lift electrode.
An arc will form when electrode is
lifted.
Normal open-circuit voltage is not
present before tungsten electrode
touches workpiece; only a low
sensing voltage is present between
electrode and workpiece. The
solid-state output contactor does
not energize until after electrode is
touching workpiece. This allows
electrode to touch workpiece with-
out overheating, sticking, or getting
contaminated.
Ref. S-156 279
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