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Trouble
Contaminated tungsten
Porosity: poor weld appearance
and colour
Reason
Back cap not tted
correctly
Torch connected to DC +
Incorrect tungsten being
used
Tungsten being oxidised after
weld is nished
Touching tungsten into the
weld pool
Touching the ller wire to
the tungsten
Wrong gas / poor gas ow
/gas leak
29
SWEISSWELD.COM
Solutions
Make sure the torch back
cap is tted so that the
o-ring is inside the torch
body
Connect the torch to the
DC- output terminal
Check and change the
tungsten type if
necessary
Keep shielding gas owing
10–15 seconds after arc
stoppage. 1 second for
each 10amps of weld
current
Keep tungsten from
contacting weld puddle.
Raise the torch so that the
tungsten is o of the work
piece 2 - 5mm
Keep the ller wire from
touching the tungsten
during welding, feed the
ller wire into the leading
edge of the weld pool in
front of the tungsten
Use pure argon. Gas is
connected, check hoses,
gas valve and torch are
not restricted. Set the gas
ow between 6-12 l/min.
Check hoses and ttings
for holes, leaks et
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