PRO-POINT 9085986 Mode D'emploi page 37

V1.0
TIG WELDING
POSSIBLE CAUSE(S)
Tungsten burning away quickly.
1. Incorrect Gas.
2. No gas.
3. Inadequate gas flow.
4. Back cap not fitted
correctly.
5. Torch connected to DC +.
6. Incorrect tungsten being
used.
7. Tungsten being oxidized
after weld is finished.
Contaminated tungsten.
1. Touching tungsten into
the weld pool.
2. Touching the filler wire to
the tungsten.
3. Tungsten melting into the
weld pool.
Porosity - poor weld appearance and colour.
1. Incorrect Gas.
2. Inadequate gas flow / gas
leaks.
3. Moisture on the base
metal.
4. Contaminated base
metal.
5. Contaminated filler wire.
6. Incorrect filler wire.
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AC/DC Inverter TIG/Arc Welder
SUGGESTED SOLUTION(S)
1. Check that argon gas is being used.
2. Check the gas cylinder contains gas and is connected
and the torch gas valve is open.
3. Check the gas is connected, check hoses, gas valve
and torch are not restricted. Use the table in
Appendix B or C to set the rate of gas flow.
4. Make sure the torch back cap is fitted so that the o-
ring is inside the torch body.
5. Connect the torch to the DC- output terminal.
6. Check and change the tungsten type if necessary.
7. Keep shielding gas flowing 10 to 15 seconds after arc
stoppage. One second for each 10 amps of weld
current.
1. Keep tungsten from contacting weld puddle. Raise
the torch so that the tungsten is off of 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. Use the table in
Appendix B or C to set the rate of gas flow. 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.
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