OM-4430 Page 24
6-5.
Stick Start Procedure
−
Scratch Start Technique
With Stick selected, start arc as
follows:
1
Electrode
2
Workpiece
3
Arc
Drag electrode across workpiece like
striking a match; lift electrode slightly
after touching work. If arc goes out
electrode was lifted to high. If
electrode sticks to workpiece, use a
quick twist to free it.
1
2
3
6-6. TIG Lift-Arc
Start Procedure
Select Lift-Arc
/Scratch Start TIG at
Process switch to achieve great arc
starts with either procedure. Perform
Lift-Arc starting method as follows:
Lift-Arc
TIG
1
TIG Electrode
2
Workpiece
Turn gas on. Touch tungsten
electrode to workpiece at weld start
point.
Hold electrode to workpiece
for 1 second
, and slowly lift electrode.
Arc is started 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
without overheating, sticking, or
getting contaminated.
Application:
Lift-Arc is used for the DCEN GTAW
process when HF Start method is not
permitted.
1
1
Second
“Touch”
2
Lift-Arc Start Method
Do NOT Strike Like A Match!