Miller 907731001 Manual del usuario - Página 39

Navegue en línea o descargue pdf Manual del usuario para Sistema de soldadura Miller 907731001. Miller 907731001 48 páginas. With auto-line, arcreach, xmt 350 fieldpro and polarity reversing ce

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6-7. Lift-Arc TIG Procedure

6-8.

Stick Start Procedure − Scratch Start Technique

"Touch"

1 Second

Do NOT Strike Like A Match!

With Process Switch in the TIG

position, start an arc as follows:

TIG Electrode

Workpiece

Touch tungsten electrode to work-

piece at weld start point. Arc will not

start while electrode is touching the

workpiece. Slowly lift electrode to

form an arc.

Do not re-touch the electrode to

the workpiece. The arc will go

out and the electrode will stick.

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.

FieldPro

Remote

connected, its display may

temporarily turn off when the

tungsten touches the work-

piece.

Ref. S-156279

With Stick selected, start arc as

follows:

Electrode

Workpiece

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.

OM-282217 Page 31