Lincoln Electric IM944 POWERTORCH PLASMA 20 - Manual (Page 15)

B-6 OPERATION B-6
Be sure the operator is equipped with proper gloves,
clothing, eye and ear protection. Make sure no part of
the operatorʼs body comes in contact with the work
piece while the torch is activated.
Sparks from the cutting process can cause dam-
age to coated, painted, and other surfaces such as
glass, plastic and metal.
NOTE: Handle torch cable with care and protect
it from damage.
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TORCH CONSUMABLE PARTS
SELECTION
To change the torch consumable parts use the follow-
ing procedure:
NOTE: The nozzle, 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
Head Assembly. Figure B.2 Consumable Parts.
2. Remove the nozzle, gas distributor, and electrode.
3. Install the electrode, gas distributor and nozzle.
4. Hand tighten the shield cup until it is seated on the
torch head. If resistance is felt when installing the
cup, check the threads before proceeding.
OPERATING FAULTS
During cutting operations performance faults may
arise, such as:
• Insufficient penetration:
too high cutting speed;
torch is tilted;
piece is too thick;
cutting current is too low;
torch parts are worn out;
non-genuine Manufacturerʼs parts.
• Interruption of the cutting arc:
cutting speed too slow;
excessive distance between torch and work
piece;
Input Voltage too low-reduce output current;
torch parts are worn out;
non-genuine Manufacturerʼs parts;
poor work cable connection/disconnected.
• Excessive slag/dross:
too low cutting speed (bottom dross);
too high cutting speed (top dross);
excessive distance between torch and work
piece;
cutting current too low;
torch parts are worn out;
non-genuine Manufacturerʼs parts.
• Tilted cutting (not perpendicular):
torch position not correct;
asymmetric wear of nozzle hole and/or
incorrect assembly of the torch parts.
• Excessive wear of nozzle and electrodes:
air pressure too low;
exceeding system capability (material too
thick);
contaminated air (humidity/oil);
excessive pilot arc ignitions in the air;
improperly assembled torch;
torch nozzle contacting workpiece;
damaged or loose torch head components;
non-genuine Manufacturerʼs parts.
POWERTORCH™ PLASMA 20
ELECTRIC SHOCK CAN KILL.
• Disconnect input power by remov-
ing the plug from the receptacle
before assembling or disassembling
torch parts, or torch and lead
assemblies.
Frequently review the Important Safety
Precautions at the front of this Manual.
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WARNING
CAUTION
SHEILD CUP
NOZZLE
ELECTRODE
TORCH HEAD
ASSEMBLY
GAS DIFFUSER RING
FIGURE B.2