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1: Tungsten burning away quickly
Possible Reason Suggested Remedy
Incorrect Gas Check that pure Argon is being used
No gas Check the gas cylinder contains gas and is connected
 Check the gas is connected, check hoses, gas valve and torch are not restricted. Set

 
Torch connected to DC + Connect the torch to the DC- output terminal
Incorrect tungsten being used Check and change the tungsten type if necessary
Tungsten being oxidised after weld


amps of weld current.
Tungsten melting back into the
nozzle on AC welding
Check that correct type of tungsten is being used. Check the balance control is not set
too high on the balance - reduce to a lower setting
2: Contaminated tungsten
Possible Reason Suggested Remedy
Touching tungsten into the weld
pool
Keep tungsten from contacting weld puddle. Raise the torch so that the tungsten is off of
the work piece 2 - 5mm
-
sten

leading edge of the weld pool in front of the tungsten
Tungsten melting into the weld pool Check that correct type of tungsten is being used. Too much current for the tungsten
size so reduce the amps or change to a larger tungsten
3: Porosity - poor weld appearance and colour
Possible Reason Suggested Remedy
Incorrect Gas Check that pure Argon is being used
 Check the gas is connected, check hoses, gas valve and torch are not restricted. Set the

Moisture on the base metal Remove all moisture from base metal before welding
Contaminated base metal Remove materials like paint, grease, oil, and dirt, including mill scale from base metal
 
 
4: Yellowish residue / smoke on the alumina nozzle & discoloured tungsten
Possible Reason Suggested Remedy
Incorrect Gas Use pure Argon gas
 
 
Alumina gas nozzle too small for size
of tungsten being used
Increase the size of the alumina gas nozzle
5: Unstable Arc during DC welding
Possible Reason Suggested Remedy
Torch connected to DC + Connect the torch to the DC- output terminal
Contaminated base metal Remove materials like paint, grease, oil, and dirt, including mill scale from base metal.
Tungsten is contaminated Remove 10mm of contaminated tungsten and re grind the tungsten
Arc length too long Lower torch so that the tungsten is off of the work piece 2 - 5mm
Unstable Arc during AC welding
 Check that pure Argon is being used. Check the gas is connected, check hoses, gas

Incorrect tungsten being used Check and change the tungsten type if necessary
Tungsten is contaminated Remove 10mm of contaminated tungsten and re grind the tungsten
Improperly prepared tungsten Use a pointed tungsten with AC Squarewave inverter machines. The point will round off
after welding.

metal

The following chart addresses some of the common problems of TIG welding. In all cases of equipment malfunction,

TIG WELDING TROUBLE SHOOTING
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