Tig Trigger Sequences - Lincoln Electric Global UI Manual

TIG Trigger Sequences

TIG welding can be done in either the 2-step or 4-step
mode. The specific sequences of operation for the trigger
modes are explained below.
Legend of the symbols used:
Torch Pushbutton
Output Current
Gas Pre-flow
Gas
Gas Post-flow
2-Step Trigger Sequence
With the 2-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
increased at a controlled rate, or upslope time, until
the Welding current is reached.
If the torch trigger is released during the upslope time
the arc will stop immediately and the output of the
machine is turned OFF. 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.
released the output will turn OFF and the post flow 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
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.
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.
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When the TIG torch trigger is