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Trouble
Arc di cult to start or will not start
DC welding
Reason
Poorly prepared tungsten
Contaminated base metal or
ller wire
Incorrect machine set up
No gas, incorrect gas ow
Incorrect tungsten size or
type
Loose connection
Earth clamp not connected
to work
31
SWEISSWELD.COM
Solutions
Grind marks should run
lengthwise with tungsten,
not circular. Use proper
grinding method and
wheel
Remove contaminating
materials like paint,
grease, oil, and dirt,
including mill scale from
base metal. Remove all
grease, oil, or moisture
from ller metal
Check machine set up is
correct
Check the gas is
connected and cylinder
valve open, check hoses,
gas valve and torch are
not restricted. Set the gas
ow between 10 - 15 l/min
ow rate
Check and change the size
and or the tungsten if
required
Check all connectors and
tighten
Connect the earth clamp
directly to the work piece
wherever possible
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