PRO-POINT MIG-ARC-TIG 145A Manuel De L'utilisateur page 33

V1.0
PROBLEM(S) POSSIBLE CAUSE(S)
Contaminated 1. Touching tungsten into
tungsten.
2. Touching the filler wire to
3. Tungsten melting into the
Porosity - poor 1. Incorrect Gas.
weld
2. Inadequate gas flow / gas
appearance
and colour.
3. Moisture on the base
4. Contaminated base metal.
5. Contaminated filler wire.
6. Incorrect filler wire.
Yellowish 1. Incorrect Gas.
residue /
2. Inadequate gas flow.
smoke on the
3. Gas nozzle too small for
nozzle &
discoloured
tungsten
Unstable Arc 1. Torch connected to DC +.
during DC
2. Contaminated base metal.
welding.
3. Tungsten is contaminated.
4. Arc length too long.
Arc wanders 1. Poor gas flow.
during DC
2. Incorrect arc length.
welding.
3. Tungsten incorrect or in
4. Poorly prepared tungsten.
5. Contaminated base metal.
6. Contaminated filler wire.
7. Incorrect filler wire.
Arc difficult to 1. Incorrect machine set up.
start or will not
2. No gas, incorrect gas flow.
start DC
3. Tungsten is contaminated.
welding.
4. Incorrect tungsten size and
5. Loose connection.
6. Earth clamp not connected
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145A MULTI-PROCESS MIG-ARC-TIG WELDER
the weld pool.
the tungsten.
weld pool.
leaks.
metal.
size of tungsten being
used.
poor condition.
or tungsten being used.
to work.
SUGGESTED SOLUTION(S)
1. Keep tungsten from contacting weld puddle. Raise the
torch so that the tungsten is off the workpiece 0.07 to
0.19 inches.
2. 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.
3. 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.
1. Check that pure Argon is being used.
2. Check the gas is connected, check hoses, gas valve and
torch are not restricted. Set the gas flow between 12 to 21
CFH flow rate. Check hoses and fittings for holes, leaks etc.
3. Remove all moisture from base metal before welding.
4. Remove materials like paint, grease, oil and dirt,
including mill scale from base metal.
5. Remove all grease, oil, or moisture from filler metal.
6. Check the filler wire and change if necessary.
1. Use pure Argon gas.
2. Set the gas flow between 12 to 21 CFH flow rate.
3. Increase the size of the gas nozzle.
1. Connect the torch to the negative DC output terminal.
2. Remove materials like paint, grease, oil and dirt,
including mill scale from base metal.
3. Remove 25/64 in. of contaminated tungsten and
regrind the tungsten.
4. Lower torch so that the tungsten is off of the workpiece
5/64 to 3/16 in.
1. Check and set the gas flow between 12 to 21 CFH flow
rate.
2. Lower torch so that the tungsten is off of the workpiece
5/64 to 3/16 in.
3. Check that correct type of tungsten is being used.
Remove 25/64 in. from the weld end of the tungsten
and resharpen the tungsten.
4. Grind marks should run lengthwise with tungsten, not
circular. Use proper grinding method and wheel.
5. Remove contaminating materials like paint, grease, oil
and dirt, including mill scale from base metal.
6. Remove all grease, oil, or moisture from filler metal.
7. Check the filler wire and change if necessary.
1. Check machine set up is correct.
2. Check the gas is connected and cylinder valve open,
check hoses, gas valve and torch are not restricted. Set the
gas flow between 21 to 32 CFH flow rate.
3. Remove 25/64 inches of contaminated tungsten and
regrind the tungsten.
4. Check and change the size and or the tungsten if required.
5. Check all connectors and tighten.
6. Connect the earth clamp directly to the workpiece
wherever possible.
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