Lincoln Electric ASPECT 300 Operator's Manual page 17

2. Release the TIG torch trigger to stop welding. 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 gas valve will
remain open to continue the flow of the shielding
gas to the hot electrode and work piece.
As shown above, it is possible to press and hold the TIG
torch trigger a second time during downslope to end the
downslope function and maintain the output current at
the Crater current. When the TIG torch trigger is
released the output will turn OFF and the postflow time
will start. This operation sequence, 2-step with restart
disabled, is the default setting from the factory.
2-Step Trigger Sequence with Restart Option
To select 2-Step with restart sequence:
Output
Press several times until the LED above lights up
Enter Menu GTAW and enable 2RST option.
If the 2-step restart option is enabled from the setup
menu the following sequence will occur:
1. Press and hold the TIG torch trigger to start the
sequence as described above.
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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.
current is reached the output of the machine is
turned OFF.
4-Step Trigger Sequence
To select 4-Step sequence:
Output
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. In
LIFT starting the touching current is 25A until the
short circuit is removed.
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.
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.
When the Crater
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