8.2 Welding torch maintenance
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:
The welding
torch is
overheated
The welding torch capacity is too
small
Replace with a welding torch with
large capacity
The cooling water pipe is blocked,
resulting in blockage or low
cooling water flow
Blow the cooling pipe with
compressed air to clear the blockage
The collet fails to clamp the
tungsten electrode
Replace the collet or back cap
The water pipe joint is damaged
or not fastened
Reconnect the water pipe and
tighten it
The welding bead between the
welding torch and the water inlet
pipe is leaking
Open up to repair the welding
The connecting thread is loose
The gas inlet pipe joint is
damaged or not fastened
Cut off the damaged joint, reconnect
and tighten the replaced gas inlet
pipe or wrap up the damaged area
The gas inlet pipe has been
damaged by heat or aging
Replace the gas inlet pipe
The torch head is wet due to
leakage or other reasons
Find the cause of water leakage, and
fully dry the torch head
The torch head is damaged or the
live metal part is exposed
Replace the torch head or wrap the
exposed electrified metal part with
adhesive tape
The welding torch is leaking
The nozzle diameter is too small
Replace with a nozzle of larger
diameter
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