Lincoln Electric Saf-Fro PRESTOTIG 315DC Manuel D'utilisation page 14

1. Press and hold the TIG torch trigger to start the
sequence as described above.
2. Release the TIG torch trigger to start the
downslope. During this time press and hold the TIG
torch trigger to restart welding. The output current
will increase again at a controlled rate until the
Welding current is reached. This sequence can be
repeated as many times as necessary. When the
welding is complete release the TIG torch trigger.
When the Crater current is reached the output of the
machine is turned OFF.
4-Step Trigger Sequence
To select 4-Step sequence:
Action
Press several times until the LED above lights up
With the 4-step trigger mode and a TIG welding mode
selected, the following welding sequence will occur.
1. Press and hold the TIG torch trigger to start the
sequence. The machine will open the gas valve to
start the flow of the shielding gas. After the preflow
time, to purge air from the torch hose, the output of
the machine is turned ON. At this time the arc is
started according to the selected welding mode.
After the arc is started the output current will be at
the Start current. This condition can be maintained
as long as necessary.
If the Start current is not necessary, do not hold the
TIG torch trigger as described at the beginning of
this step. In this condition, the machine will pass
from Step 1 to Step 2 when the arc is started.
2. Releasing the TIG torch trigger starts the upslope
function. The output current will be increased at a
controlled rate, or upslope time, until the Welding
current is reached. If the torch trigger is pushed
during the upslope time the arc will stop immediately
and the output of the machine is turned OFF.
3. Press and hold the TIG torch trigger when the main
part of the weld is complete. The machine will now
decrease the output current at a controlled rate, or
downslope time, until the Crater current is reached.
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Visualization
11
4. This Crater current can be maintained as long as
necessary. When the TIG torch trigger is released
the output of the machine is turned OFF and the
postflow time will start.
As shown here, after the
TIG torch trigger is quickly
pressed and released from
step 3A, it is possible to
press and hold the TIG
torch trigger another time
to end the downslope time
and maintain the output
current at the Crater
current. When the TIG
torch trigger is released
the output will turn OFF.
This sequence operation, 4-step with restart disabled, is
the default setting from the factory.
4-Step Trigger Sequence with Restart Option
To select 4-Step with restart sequence:
Action
+
See "Setup menu" section below
Press several times until the LED above lights up
If 4-step restart is enabled from the setup menu the
following sequence will occur for steps 3 and 4 (steps 1
and 2 are not altered by the restart option):
3. Press and hold the TIG torch trigger. The machine
will now decrease the output current at a controlled
rate, or downslope time, until the Crater current is
reached.
4. Release the TIG torch trigger. The output current
will again increase to the Welding current, like in
step 2, to continue welding.
If the weld is completely finished, use the following
sequence instead of step 3 described above.
3A. Quickly press and release the TIG torch
trigger. The machine will now decrease the
output current at a controlled rate, or downslope
time, until the Crater current is reached and the
output of the machine is turned OFF. After the
arc is turned OFF the postflow time will start.
Visualization
then:
English