23OPERATING MANUAL
TIG MAINTENANCE, SERVICE TIPS AND ADVICE
• Periodically remove the nozzle, head insulators, collet and collet body and
inspect for wear and damage. Any worn or damaged parts should be changed
immediately.
• Care should be taken not to let torch leads contact any hot surfaces. When the
torch is not in use for prolonged periods ensure the high frequency switch is o.
• It the torch has not been used for 15 minutes or more purge the gas line.
• Always ensure adequate gas ow prior to welding.
• To prevent electrode oxidisation and aid electrode cooling an adequate post ow
is recommended.
Cleanliness of both the weld joining areas and ller metals are an important
consideration in the TIG process. Oil, grease, dust, paint or marking crayon and
corrosion deposits must be removed from the immediate joint area.
• The chief causes of arc instability and contaminated welds are;
• Contact of electrode tip with molten weld pool
• Contamination of electrode tip by weld pool spatter
• Contact of ller metal with electrode tip
• Exceeding the current carrying capacity of a given electrode size
• The extension of an electrode beyond the recommended distance from the collet
• Inadequate tightening of collets and back caps
• Inadequate shielding ow or excessive drafts
• Electrode arc wander or defect in the electrode surface
• The use of improper shielding gas
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