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OM-188 422 Page 23
4-4. Lift-Arc TIG Procedure
With Mode 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.
1
1 – 2
Seconds
“Touch”
Do NOT Strike Like A Match!
2
Ref. S-156 279