2
Contaminated
tungsten
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
Touching the filler wire to the
tungsten
Keep the filler wire from touching
the tungsten during welding, feed the
filler wire into the 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
Wrong gas / poor gas flow
/gas leak
Use pure argon. Gas is connected,
check hoses, gas valve and torch are
not restricted. Set the gas flow
between 6-12 l/min. Check hoses
and fittings for holes, leaks et
Contaminated base metal
Remove moisture and materials like
paint, grease, oil, and dirt from base
metal
Contaminated filler wire
Remove all grease, oil, or moisture
from filler metal
Incorrect filler wire
Check the filler wire and change if
necessary
4
Yellowish residue /
smoke on the
alumina nozzle &
discoloured
tungsten
Incorrect Gas
Use pure Argon gas
Inadequate gas flow
Set the gas flow between 10 - 15
l/min flow rate
Inadequate post flow gas
Increase the post flow gas time
Alumina gas nozzle too small Increase the size of the alumina gas
nozzle
5
Unstable Arc
during welding
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
6
HF present but no
welding power
Incomplete welding circuit
Check earth lead is connected.
Check all cable connections. If using
a water cooled torch check that the
power cable is separated.
35
www.strata.co.nz
EZITIG 205DC
