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Trouble
Yellowish residue / smoke on the
alumina nozzle & discoloured
tungsten
Unstable Arc during DC welding
Arc wanders during DC welding
Reason
Contaminated base metal
Contaminated ller wire
Incorrect ller wire
Incorrect Gas
Inadequate gas ow
Alumina gas nozzle too
small
Torch connected to DC +
Contaminated base metal
Tungsten is contaminated
Arc length too long
Poor gas ow
Incorrect arc length
Tungsten incorrect or in
poor condition
30
SWEISSWELD.COM
Solutions
Remove moisture and
materials like paint,
grease, oil, and dirt from
base metal
Remove all grease, oil, or
moisture from ller metal
Check the ller wire and
change if necessary
Use pure Argon gas
Set the gas ow between
10 - 15 l/min ow rate
Increase the size of the
alumina gas nozzle
Connect the torch to the
DC- output terminal
Remove materials like
paint, grease, oil, and dirt,
including mill scale from
base metal.
Remove 10mm of
contaminated tungsten
and re grind the tungsten
Lower torch so that the
tungsten is o of the work
piece 2 - 5mm
Check and set the gas ow
between 10 - 15 l/min ow
rate
Lower torch so that the
tungsten is o of the work
piece 2 - 5mm
Check that correct type of
tungsten is being used.
Remove 10mm from the
weld end of the tungsten
and re sharpen the tungs-
ten
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