MAINTENANCE AND TROUBLESHOOTING
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
10 - 15 l/min flow rate
Incorrect arc length
Lower torch so that the tungsten is
off of 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 the tungsten
Poorly prepared tungsten
Grind marks should run lengthwise
with tungsten, not circular. Use
proper grinding method and wheel.
Contaminated base metal or
filler wire
Remove contaminating materials
like paint, grease, oil, and dirt,
including mill scale from base metal.
Remove all grease, oil, or moisture
from filler metal
7
Arc difficult to
start or will not
start DC welding
Incorrect machine set up
Check machine set up is correct
No gas, incorrect gas flow
Check the gas is connected and
cylinder valve open, check hoses,
gas valve and torch are not
restricted. Set the gas flow between
10 - 15 l/min flow rate
Incorrect tungsten size or
type
Check and change the size and or the
tungsten if required
Loose connection
Check all connectors and tighten
Earth clamp not connected to
work
Connect the earth clamp directly to
the work piece wherever possible
63
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