Miller XMT 456 CC/CV Посібник користувача - Сторінка 24

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4-7. Lift-Arc TIG Procedure For XMT 456 CC/CV

OM-2232 Page 20

1 − 2

"Touch"

Seconds

Do NOT Strike Like A Match!

With Mode 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