15
SECTION 3
OPERATION
Fig. 3-2 - Assembly of “XT” Consumable Parts
The PT-31XL torch head contains a gas flow
check valve that acts in conjunction with the
flow switch and circuitry within the power source.
This system prevents the torch from being ener-
gized with high voltage if the torch switch is
accidentally closed when the shield is removed.
ALWAYS REPLACE TORCH WITH THE PROPER
TORCH MANUFACTURED BY ESAB SINCE IT
ALONE CONTAINS ESAB’S PATENTED SAFETY
INTERLOCK.
For additional torch information, see booklet (F-14-
246) packed with the PT-31XL torch.
3.4 CUTTING WITH THE PT-31XL
Wear the usual protective gloves, clothing, and
helmet. Helmet with filter lens shade No. 6 or 7
should provide adequate protection for your
eyes.
Never touch any parts forward of the torch handle
(tip, heat shield, electrode, etc.) unless the power
switch is in the OFF position.
CAUTION: Do not depress the torch switch unless
the torch nozzle is touching or within
0.020-in. (less than 1/32-in.) of the
workpiece.
NOTE: Nozzles
Marked By
Amperage
E.
"Over Temperature" LED Yellow light -
will
turn on if the machine becomes overheated.
Will turn off automatically after the machine
cools down if the on/off switch is still on.
"Low Air Flow" LED Green light -
will turn
on during operation when the air flow is cor-
rect. Will switch off below 15psi (1 bar).
On/Off Switch (White light) -
will light when
switched on, even if the machine stopped for
any reason. Will turn off when switch is in OFF
position or the light bulb is defective.
Air Pressure Gauge (Front Panel) -
Shows
air pressure in bars and psi.
3.3 ASSEMBLING PT-31XL
COMSUMABLE PARTS
Make sure power switch on power source is in
OFF position and primary input power is
deenergized.
To assemble “XT” consumables, remove the seat
supplied with the torch. Insert the plunger into the
head. (The plunger is reversible.) Then reassemble
the seat firmly with a wrench. Install the electrode,
baffle, nozzle, and heat shield as shown in Fig. 3-2.
Tighten heat shield snugly but do not overtighten.
BE SURE to install the swirl baffle in the torch.
Failure to do so would allow the nozzle (tip) to
contact the electrode. This contact would permit
high voltage to be applied to the nozzle. Your
contact with the nozzle or workpiece could then
result in serious injury or death by electric
shock.
20862
Plunger
Seat
19679
Electrode
20324
20463
Baffle
Nozzle
Heat Shield
20282
Fig. 3-3 - Effect of Cutting Speed
TOO FAST
TOO SLOW
CORRECT
35/40A
21008
