ESAB PCM-875, Instruction Manual

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SECTION 3 OPERATION
18
WHEN THE ARC BREAKS
THROUGH THE WORK,
BRING THE TORCH TO AN
UPRIGHT POSITION AND
PROCEED TO CUT.
TO START A PIERCE, TILT THE
TORCH TO PREVENT MOLTEN MA-
TERIAL FROM COMING BACK
AGAINST AND DAMAGING THE
TORCH.
1
2
Figure 3-4. Piercing Technique using the PT-27
3.4 COMMON CUTTING PROBLEMS
Listed below are common cutting problems followed by
the probable cause of each. If problems are determined
to be caused by the PCM-875, refer to the maintenance
section of this manual. If the problem is not corrected
after referring to the maintenance section, contact your
ESAB distributor.
A. Insufficient Penetration.
1. Current too low.
2. Cutting speed too fast.
3. Damaged cutting nozzle.
4. Improper air pressure.
5. Low air flow rate.
B. Main Arc Extinguishes.
1. Cutting speed too slow.
2. Worn electrode.
C. Dross Formation. (In some materials and thick-
nesses, it may be impossible to get dross-free cuts.)
1. Current too low.
2. Cutting speed too fast or too slow.
3. Improper air pressure.
4. Faulty nozzle or electrode.
5. Low air flow rate.
D. Double Arcing. (Damaged Nozzle Orifice.)
1. Low air pressure.
2. Damaged cutting nozzle.
3. Loose cutting nozzle.
4. Heavy spatter accumulation on nozzle.
E. Uneven Arc.
1. Damaged cutting nozzle or worn electrode.
F. Unstable Cutting Conditions.
1. Incorrect cutting speed.
2. Loose cable or hose connections.
3. Electrode and/or cutting nozzle in poor condi-
tion.
G. Main Arc Does Not Strike.
1. Worn electrode.
2. Loose connections.
3. Worn cable not attached.
H. Poor Consumable Life.
1. Improper gas pressure.
2. Contaminated air supply.
3. Low air flow rate.