4-4. Lift-Arc TIG Procedure
1 2
1 – 2
“Touch” Seconds
Do NOT Strike Like A Match!
With Mode switch in the Lift-Arc TIG position, start an arc as follows:
1TIG Electrode
2Workpiece
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
