24 ACDC200LCD
Trouble Shooting Guide for Gas Tungsten Arc Welding
Problem Analysis Solutions
Excessive Electrode
Consumption
1. Inadequate gas ow
2. Operating on reverse
polarity
3. Improper size electrode
for current required
4. Excessive heating in
holder
5. Contaminated electrode
6. Electrode oxidation during
cooling
7. Using gas containing
oxygen or CO²
1. Increase gas glow
2. Use large electrode or
change to straight polarity
3. Use larger electrodes
4. Check for proper collet
contact
5. Remove contaminated
portion. Erratic results
will continue as long as
contamination exists
6. Keep gas owing after
stopping arc for at least
10 – 15 seconds
7. Change to proper gas
Erratic arc
1. Base metal is dirty or greasy
2. Joint too narrow
3. Electrode is contaminated
4. Arc too long
1. Use appropriate chemical
cleaners, wire brush
or abrasives
2. Open joint groove, bring
electrode closer to work,
decrease voltage
3. Remove contaminated
portion of electrode
4. Bring holder closer to work
to shorten arc
Porosity
1. Entrapped gas impurities
(hydrogen, nitrogen, air,
water, vapour)
2. Defective gas hose or
loose hose connections
3. Oil lm on base metal
1. Blow out air from all lines
before striking arc. Use
welding grade (99.99%)
inert gas
2. Check hose and
connections for leaks
3. Bring holder closer to work
to shorten arc
Tungsten
contamination of
work piece
1. Contact starting with
electrode
2. Electrode melting and
alloying with base metal
3. Touching tungsten
metal pool
1. Using high frequency
start or using copper
striker plate
2. Use less current or
larger electrode
3. Keep tungsten out of
molten pool
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