Lincoln Electric INVERTEC 300TPX Operator's Manual page 11

TIG
Before to start a TIG welding, a gas circuit purge is
recommended.
To purge the gas circuit and torch:
Action
At idle, before welding
Press SEL
Press and keep pushed
SEL
Release SEL
Lift TIG (GTAW welding)
To select Lift TIG welding:
Action
Press MODE several times until the LED above lights up
When the mode pusbutton is in the Lift TIG position, the
stick welding functions are disabled and the machine is
ready for Lift TIG welding. Lift TIG is a method of
starting a TIG weld by first pressing the TIG torch
electrode on the work piece in order to create a low
current short circuit. Then, the electrode is lifted from
the work piece to start the TIG arc.
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The purge function is
active; the gas continues to
flow until the SEL
pushbutton is released.
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HF TIG (GTAW welding)
To select HF TIG welding:
Action
Press MODE several times until the LED above lights up
When the mode pushbutton is in HF TIG position, the
stick welding functions are disabled and the machine is
ready for HF TIG welding. During the HF TIG mode, the
TIG arc is started by HF without pressing the electrode
on the work piece. The HF used for starting the TIG arc
will remain on for 3 seconds; if the arc is not started in
this time limit, the trigger sequence must be restarted.
The HF arc start strength can be adjusted in the setup
menu by changing the value of option 40. Six arc start
strengths are available, ranging from 1 (smooth, suitable
for thin electrodes) to 6 (strong, suitable for thick
electrodes). The default value for this option is 3.
Spot TIG (GTAW welding)
The Spot TIG feature is selectable only if the "option 10"
is previously enabled in the Setup Menu.
To select Spot TIG welding:
Action
Press MODE several times until the LED above lights up
This welding mode is especially thought to tack or weld
thin materials. It uses HF start and immediately delivers
the set current without any upslope/downslope. The
welding time can be either linked to the trigger or set
with the spot time control.
If the spot time ("option 11" of the Setup Menu) is
enabled from the setup menu, in order to change the
spot time:
Action
At idle, before welding
Press SEL
At this point the spot time can be adjusted by turning the
Output Current knob. Setting the spot time to 0 will
disable the fixed time function and the welding time will
be linked to the TIG torch trigger.
NOTE: The HF start strength is adjusted by setup option
40, as described in the HF Tig section above.
See "Setup menu" section for options enabling /
disabling.
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