OM-235 241 Page 22
5-10. Lift-Arc
™
And HF TIG Start Procedures
Lift-Arc Start
When Lift-Arc
t
button light is On, start arc as
follows:
1
TIG Electrode
2
Workpiece
Touch tungsten electrode to workpiece at weld start
point, enable output and shielding gas with torch
trigger, foot control, or hand control. Hold electrode
to workpiece for 1-2 seconds, and slowly lift elec-
trode. Arc is formed 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 work-
piece. This allows electrode to touch workpiece
without overheating, sticking, or getting
contaminated.
Application:
Lift-Arc is used for the DCEN or AC GTAW process
when HF Start method is not permitted, or to replace
the scratch method.
HF Start
When HF Start button light is On, start arc as
follows:
High frequency turns on to help start arc when out-
put is enabled. High frequency turns off when arc is
started, and turns on whenever arc is broken to help
restart arc.
Application:
HF start is used for the DCEN GTAW process when
a non-contact arc starting method is required.
1
1 − 2
Seconds
“Touch”
Do NOT Strike Like A Match!
2
Lift-Arc Start Method
