Lincoln Electric INVERTEC V160 Service Manual page 10

After the arc is started the output current will be
increased to the welding current. This increase, or
upslope, of the output current takes 0.5 seconds to
complete.
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 time is
adjusted by the Downslope Control knob.
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.
duration of this postflow shielding gas is adjusted by
the Postflow Control knob.
Possible variations of this standard sequence are shown
below. (If necessary, other variations are also available;
contact your Lincoln Electric sales representative for
more information.)
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.
released the output will turn OFF and the postflow time
will start.
4-Step Sequence
With the Trigger Mode switch in the 4-step position, 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.
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). For more information on the
Lift or HF TIG starting methods, refer to the Mode
switch section above.
After the arc is started the output current will be at
the Start/Crater current.
maintained as long or as short as necessary.
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.
BACK
When the TIG torch trigger is
After a 0.5 second
This condition can be
2. Release the TIG torch trigger to start the main part
of the weld.
The output current will be increased to the welding
current. This increase, or upslope, of the output
current takes 0.5 seconds to complete.
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 adjusted by the Downslope Control knob. This
Start/Crater current can be maintained as long or as
short as necessary.
The
This sequence has an automatic restart so welding
will continue after this step.
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 Start/Crater current is reached and the
output of the machine is turned OFF. After the
arc is turned OFF the postflow time will start.
4. Release the TIG torch trigger.
The output current will again increase to the welding
current, like in step 2, to continue welding. When
the main part of the weld is complete go to step 3.
Possible variations of this standard sequence are shown
below. (If necessary, other variations are also available;
contact your Lincoln Electric sales representative for
more information.)
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
Start/Crater current.
released the output will again increase to the welding
current, like in step 4, to continue welding. When the
main part of the weld is complete go to step 3.
As shown here, again after the TIG torch trigger is
quickly pressed and released from step 3A, it is possible
to quickly press and release the TIG torch trigger a
second time to end the downslope time and stop welding.
If the weld is
When the TIG torch trigger is
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