Miller XMT 304, Owner'S Manual

Page: 28 / 40

OM-2208 Page 24
6-4. Lift-Arc TIG Procedure
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.
1
1 − 2
Seconds
“Touch”
Do NOT Strike Like A Match!
2
Ref. S-156 279
SECTION 7 − MAINTENANCE & TROUBLESHOOTING
7-1. Routine Maintenance
!
Disconnect power
before maintaining.
.
Maintain more often
during severe conditions.
3 Months
Replace
Damaged Or
Unreadable
Labels
Replace Cracked
Torch Body
Repair Or
Replace
Cracked
Cables
Repair Or Replace
Cracked Cables
And Cords
Clean
And
Tighten Weld
Connections
6 Months
Blow Out Inside