Lincoln Electric INVERTEC V270 Bedienungsanleitung Seite 9

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. 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.
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
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. When the TIG
torch trigger is 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.
9
(3A) (4)
TORCH
BUTTON
OUTPUT
CURRENT
--- GAS ON ---
GAS
(3A)
TORCH
BUTTON
OUTPUT
CURRENT
POST-FLOW
--- GAS ON ---
GAS