Inspection and replacement consumable torch parts – Tweco PC250 User Manual
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3. Excessive Dross Formation
a. Cutting speed too slow (bottom dross)
b. Cutting speed too fast (top dross)
c. Torch standoff too high from workpiece
d. Worn torch parts
e. Improper cutting current
f. Non-Genuine Manufacturer's Parts
4. Short Torch Parts Life
a. Oil or moisture in air source
b. Exceeding system capability (material too thick)
c. Excessive pilot arc time
d. Air flow too low (incorrect pressure)
e. Improperly assembled torch
f. Torch tip contacting workpiece
g. Damaged or loose torch head components
h. Non-Genuine Manufacturer's Parts
5. Poor Pilot Starting
a. Non-Genuine Manufacturer's Parts
INSPECTION AND REPLACEMENT CONSUMABLE TORCH PARTS
Disconnect primary power to the system before disassembling the torch or torch leads. DO NOT
touch any internal torch parts while the AC indicator light on the front panel of the Power Supply is ON. Remove the
consumable torch parts per the following procedure: NOTE The tip, gas distributor, and electrode are held in place by
the shield cup. Position the torch with the shield cup facing upward to prevent these parts from falling out when the
cup is removed.
1. Unscrew and remove the shield cup from the torch.
NOTE Slag built up on the shield cup that cannot
be removed may effect the performance of the
system. Figure C Consumable Parts.
2. Inspect the cup for damage. Wipe it clean or
replace if damaged.
3. Remove the tip. Check for excessive wear
(indicated by an elongated or oversized orifice).
Replace the tip if necessary. Figure D Tip Wear.
4. Remove the gas distributor. Check for excessive wear, plugged gas slots, or discoloration. Replace if
necessary.
5. Remove the electrode. Refer to Figure E and
check the face of the electrode for excessive wear.
The face of the electrode should not be recessed
more than 0.10 inch (2.5 mm). If it is worn beyond
this point it must be replaced.
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WARNING
Figure C Consumable Parts
Figure D Tip Wear
A-00780
Electrode
Gas
Distributor
Tip
Standard
Shield Cup
Torch Head Assembly
A-00323
Good Tip
Worn Tip