Lift-Arc Tig Procedure; Section 7 − Maintenance & Troubleshooting; Routine Maintenance - Miller XMT 304 Owner's Manual

6-4. Lift-Arc TIG Procedure

SECTION 7 − MAINTENANCE & TROUBLESHOOTING

7-1. Routine Maintenance

OM-2208 Page 24
1
1 − 2
"Touch"
Seconds
Do NOT Strike Like A Match!
!
Disconnect power
before maintaining.
Replace
Damaged Or
Unreadable
Labels
2
3 Months
Repair Or
Replace
Cracked
Cables
6 Months
Blow Out Inside
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.
Ref. S-156 279
.
Maintain more often
during severe conditions.
Replace Cracked
Torch Body
Repair Or Replace
Cracked Cables
And Cords
Clean
And
Tighten Weld
Connections