Miller Electric 280 NT manual Stick Start Procedure − Scratch Start Technique, Lift-Arc t TIG

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6-6. Stick Start Procedure − Scratch Start Technique

1

2

3

With Stick selected, start arc as follows:

1Electrode

2Workpiece

3Arc

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.

6-7. TIG Lift-Arc™Start Procedure

Lift-Arc Start Method

1 2

“Touch”1 Second

Do NOT Strike Like A Match!

Select Lift-Arct/Scratch Start TIG at Process switch to achieve great arc starts with either procedure. Perform Lift-Arc starting method as follows:

Lift-Arc t TIG

1TIG Electrode

2Workpiece

Turn gas on. Touch tungsten electrode to workpiece at weld start point. Hold electrode to workpiece for 1 second, and slowly lift electrode. Arc is started 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 without overheating, sticking, or getting contaminated.

Application:

Lift-Arc is used for the DCEN GTAW process when HF Start method is not permitted.

OM-4430 Page 28