Tweco PAK 44G - Manual (Page 28)

OPERATION 22 Manual 0-2686
1. Wait five minutes before turning off the fan and
pump and opening the main disconnect switch to
shut down.
2. For maximum parts life, do not operate the pilot
arc any longer than necessary.
3. Remember that gouging current can be adjusted at
any time. Adjust the current output to provide a
comfortable working speed for the particular ma-
terial being gouged.
4. Use care in handling torch leads and protect them
from damage.
5. In continuous gouging applications, it is often nec-
essary to manifold four to six cylinders together
to maintain pressure at 40 psi (2.8 BAR) for sec-
ondary gas.
WARNINGS
FREQUENTLY REVIEW THE SAFETY PRE-
CAUTIONS GIVEN AT THE FRONT OF THIS
MANUAL.
It is not enough to simply move the ON/OFF
switch on the unit to its OFF position when goug-
ing operations have been completed. Always open
the power supply disconnect switch five minutes
after the last cut is made.
B. Hand Torch Operation
WARNING
Be sure the operator is equipped with proper gloves,
clothing, eye and ear protection and that all pre-
cautions at the front of this manual have been fol-
lowed.
1. Hold the torch comfortably. One hand should be close
to the torch body and the other hand back so that the
thumb can conveniently operate the control switch.
Position the torch over the workpiece, resting the front
of the cup on the edge of the workpiece at the point
where the gouging is to start. This will positively lo-
cate the line of the gouge.
2. Lower the welding helmet and lift the torch about
1/4" (6.4 mm) from the workpiece. Press and hold
the control switch on the torch. After a two sec-
ond gas purge, the pilot arc will come on and re-
main on until the main gouging arc is established,
at which point the pilot arc circuit switches off
automatically.
3. The gouging arc will remain on as long as the con-
trol switch is held down unless the torch is with-
drawn from the work or the torch motion is too
slow. If the gouging arc is interrupted when the
control switch is held down the pilot arc will come
on again. It will remain on until the gouging arc is
again established or the control switch is released.
4. Gouge with the torch about 1/4" to 1/2" (6.4-12.7
mm) from the workpiece. For best quality of gouge
and longest tip life hold the torch at 25° to the work.