28
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
•
3.4. Operation environment
Height above sea level ≤1000 M
Operation temperature range -10
～
+40°C
Air relative humidity is below 90 %( 20°C)
Preferable site the machine some angles above the floor level, the maximum angle does
not exceed 15
℃
.
Protect the machine against heavy rain AND against direct sunshine.
The content of dust, acid, corrosive gas in the surrounding air or substance cannot exceed
normal standard.
Take care that there is sufficient ventilation during welding. There must be at least 30cm
free distance between the machine and wall.
