Miller XMT 304 Owner's Manual - Page 28

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6-4. Lift-Arc TIG Procedure

SECTION 7 − MAINTENANCE & TROUBLESHOOTING

7-1. Routine Maintenance

OM-2208 Page 24

1 − 2

"Touch"

Seconds

Do NOT Strike Like A Match!

Disconnect power

before maintaining.

Replace

Damaged Or

Unreadable

Labels

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:

TIG Electrode

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