H&S HSM250 - Page 77

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-74-
3
Porosity - poor
weld appearance
and color
Wrong gas / poor gas flow
/gas leak
Gas is connected, valve ON,
check hoses, gas valve and torch
are not restricted. Set the gas
flow between 20-40 CFH (6-12
l/min). Check hoses and fittings
for leaks.
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 &
discolored
tungsten
Incorrect Gas
Use pure Argon gas
Inadequate gas flow
Set the gas flow between 20-40
CFH (10-20 l/min) flow rate
Alumina gas nozzle too
small
Increase the size of the alumina
gas nozzle
5
Unstable Arc
during DC
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
Arc wanders
during DC
welding
Poor gas flow
Check and set the gas flow
between 20-40 CFH flow rate
Incorrect arc length
Lower torch so that the tungsten
is off the work piece 2 - 5mm
Tungsten incorrect or in
poor condition
Check that correct type of
tungsten is being used. Remove
10mm from the weld end of the
tungsten and re sharpen rod.
Poorly prepared tungsten
Grind marks should run
lengthwise with tungsten, not
circular. Use proper grinding
method and wheel.