Jasic EVOLVE 200 Operator's Manual page 58

TIG TORCH TROUBLESHOOTING
TIG welding defects and prevention methods
The TIG torch used for lift TIG welding comprises of several items which ensure current flow and arc
shielding from the atmosphere.
Regular maintenance of the welding torch is one of the most important measures to ensure its normal
operation and extend lifespan.
In order to ensure normal maintenance, the wearing parts of the torch should have spares, including the
electrode holder, nozzle, sealing ring, insulating washer, etc.
Common faults of the welding torch include overheating, gas leakage, water leakage, poor gas protection,
electric leakage, nozzle burn out, and cracking.
The causes of these faults and troubleshooting methods are as shown in the following table.
Symptom
The welding torch is
overheating.
Gas leakage.
Operator receiving a
shock from the torch.
Poor gas flow or
porosity in the weld.
Arc started between
the collet/collet
holder or the tungsten
electrode/torch head.
Reasons
The welding torch capacity is too
small.
The collet fails to clamp the tungsten
electrode.
The sealing ring is worn.
The gas connection thread is loose.
The gas inlet pipe joint is damaged or
not fastened.
The gas inlet pipe has been damaged
by heat or aging.
The torch head is wet due to leakage
or other reasons.
The torch head is damaged or the live
metal part is exposed.
The welding torch is leaking.
The nozzle diameter is too small.
The nozzle is damaged or cracked.
The gas circuit in the welding torch is
blocked.
The gas screen has been damaged or
lost during disassembly and assembly.
The argon gas is impure.
The gas flow is too large or small.
The collet and tungsten electrode have
poor contact, or arc is started when
the tungsten electrode contacts the
base metal.
The collet and welding torch have poor
contact.
Troubleshooting
Replace with a welding torch with large
capacity.
Replace the collet or back cap.
Replace the sealing ring.
Tighten the gas connections.
Cut off the damaged joint, reconnect and
tighten the replaced gas inlet pipe or wrap up
the damaged area.
Replace the gas inlet pipe.
Find the cause of water leakage, and fully dry
the torch head.
Replace the torch head or wrap the exposed
electrified metal part with adhesive tape.
Locate the leakage.
Replace with a nozzle of larger diameter.
Replace with a new nozzle.
Blow the circuit with compressed air to clear
the blockage.
Replace with a new gas screen.
Replace with standard argon gas.
Adjust the gas flow properly.
Replace the collet or repair.
Connect the collet and welding torch properly.
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