Hobart Welding Products 3025 Lift-Arc TIG Procedure, Touch Seconds Do not Strike Like a Match

5-5. Lift-Arc TIG Procedure

1 2

1 – 2

“Touch” Seconds

Do NOT Strike Like A Match!

With Mode Switch in the Lift-Arc TIG position, start an arc as follows:

1TIG Electrode

2Workpiece

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

Notes

OM-492 Page 21