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button. The specific sequences of operation for these
two trigger modes are explained below.
2-Step TIG Sequence
With the 2-step trigger mode and a TIG welding mode
selected, the following welding sequence will occur. To
setup the machine for TIG welding refer to the Output
Connections section.
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 (Lift
TIG or HF TIG). The default setting is HF starting
and can be changed to Lift TIG in the set-up menu.
After the arc is started the output current will be
increased to the welding current. This increase or
upslope time will be dependent on the times you
have selected using the Parameter Selector switch.
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
Start/Crater current is reached and the output of the
machine is turned OFF. The Downslope Control
adjusts the downslope time.
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. The
Postflow Control adjusts the duration of this postflow
shielding gas time.
As shown above, it is possible to press and hold the TIG
torch trigger a second time during downslope to end the
downslope time and maintain the output current at the
Start/Crater current. When the TIG torch trigger is
released the output will turn OFF and the postflow time
will start.
The default setting is restart disabled. Restart enabled
can be selected in the set-up menu.
4-Step Sequence
With the 4-step trigger mode and a TIG welding mode
selected, the following welding sequence will occur. To
setup the machine for TIG welding refer to the Output
Connections section.
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 (Lift
TIG or HF TIG). The default setting is HF starting
and can be changed to Lift TIG in the set-up menu.
After the arc is started the output current will be at
the Start/Crater current. This condition can be
maintained as long or as short as necessary (search
arc facility).
If the Start/Crater current is not necessary, do not
hold the TIG torch trigger as described at the
beginning of this step. Instead, quickly press and
release it. In this condition, the machine will
automatically pass from Step 1 to Step 2 when the
arc is started.
2.
Releasing the TIG torch trigger starts the upslope
function. The time is dependant on the upslope
time you have selected using the Parameter
Selector switch. The output current will be
increased to the set welding current.
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 Start/Crater current is
reached. The Downslope time is dependant on the
time that has been set using Parameter Selection
switch. This finish/Crater current can be maintained
as long or as short as necessary.
This sequence has an automatic restart so welding
will continue after this step. 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
A-5
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