Lincoln Electric Saf-Fro PRESTOTIG 315DC Manuel D'utilisation page 12

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.
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.
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Visualization
Visualization
Visualization
Visualization
Voltage
9
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.
Tig Welding Sequences
At each pressure of the SEL
pusbutton the LEDs lights up in the
following order:
1 S
2 A
3 S
4
4a
4b
4d
5
6
7
1 PREFLOW
In the TIG welding modes, this function controls the
shielding gas Preflow time. In Stick welding mode,
this is not used.
2 START CURRENT
This function controls the initial current when a TIG
welding is started. For an explanation of the Start
operation, refer to the trigger sequences explained
below.
3 UPSLOPE
In the TIG welding modes, this function controls the
linear increase of the current from Start to Set
Current. Refer to the trigger sequence section
below to understand how Upslope is activated. In
Stick welding mode, this is not used.
4 SET CURRENT
This function is used to set the Output Current used
during welding.
4a DUTY CYCLE (PULSING ON-TIME)
When the pulse feature is ON, this function controls
the pulsing on-time. During the on-time the output
current is equal to the Set Current.
4b FREQUENCY
When the pulse feature is ON, this function controls
the pulsing frequency, that is the square wave
represented in the diagram above (Hz).
4d BACKGROUND
When the pulse feature is ON, this function controls
the pulsing Background current. This is the current
during the low portion of the pulse waveform.
5 DOWNSLOPE
In the TIG welding modes, this function controls the
linear decrease of the current from Set to Crater
Current. Refer to the trigger sequence section
below to understand how Downslope is activated.
In Stick welding mode, this is not used.
A
%
Hz
A
S
A
S
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