PRO-POINT 9085986 Mode D'emploi page 28

9085986
4. Hold the electrode slightly above the workpiece to maintain the arc
while travelling at an even speed to create an even weld.
5. Release the trigger (2T) or press and release the trigger (4T) to de-
energize the torch. The power will gradually reduce and the post-flow
gas will protect the electrode and weld.
6. Wait for the weld to cool and carefully chip away the slag to reveal the
weld metal underneath.
TIG WELDING FUNDAMENTALS
HIGH FREQUENCY IGNITION
HF Ignition is a contactless ignition method. Position the electrode tip 2 mm
away from the work surface. Pressing the TIG torch trigger causes a high
voltage surge that ionizes the air between the tip and workpiece material. An
arc forms across the gap and welding can commence. Also if the electrode
moves too far up and the arc is extinguished, moving it back into range will
reignite the arc without touching the workpiece.
LIFT ARC IGNITION FOR TIG WELDING
Lift Arc ignition allows the arc to be started easily in DC TIG by simply touching the
tungsten to the workpiece and lifting it up to start the arc. When the machine
detects that the tungsten has left the surface and a spark is present, it immediately
(within microseconds) increases power, converting the spark to a full arc.
This prevents the tungsten tip sticking to the workpiece and breaking the tip from
the tungsten electrode. It is a simple, safe lower cost
alternative arc ignition process to HF (high frequency) and a
superior arc start process to scratch start. There is a
particular technique called 'rocking the cup' used in the Lift
Arc process that provides easy use of the Lift Arc function.
1. Make sure the front-end parts of the TIG torch are
correctly assembled, use the correct size and type of
tungsten electrode for the job, the tungsten electrode
requires a sharpened point for DC welding.
2. Turn on the Gas Valve located on the TIG torch handle.
3. Lay the outside edge of the Gas Cup on the workpiece
with the Tungsten Electrode 25/64 to 1/16 in. from the
workpiece.
4. With a small movement rotate the Gas Cup forward so
that the Tungsten Electrode touches the workpiece (Fig.
14 and 15).
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AC/DC Inverter TIG/Arc Welder
For technical questions call 1-800-665-8685
V1.0
Fig. 14
Fig. 15