Fronius TTWO 2000 Manual De Instrucciones página 28

Poor weld properties
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The gas nozzle becomes very hot
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Welding torch becomes very hot
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28
Incorrect welding parameters
Correct settings
Poor grounding (earthing) connection
Ensure good contact to workpiece
Inadequate or no protective gas shield
Check the pressure regulator, gas hose, gas solenoid valve and welding torch
shielding gas connection. On gas-cooled welding torches, inspect the gas
seals, use a suitable inner liner
Welding torch is leaking
Replace welding torch
Contact tip is too large or worn out
Replace the contact tip
Wrong wire alloy or wrong wire diameter
Check wirespool/basket-type spool in use
Wrong wire alloy or wrong wire diameter
Check weldability of the base material
The shielding gas is not suitable for this wire alloy
Use the correct shielding gas
Unfavourable welding conditions: shielding gas is contaminated (by moisture,
air), inadequate gas shield (weld pool "boiling", draughts), contaminants in
the workpiece (rust, paint, grease)
Optimise the welding conditions
Welding spatter in the gas nozzle
Remove welding spatter
Turbulence caused by too high a rate of shielding gas flow
Reduce shielding gas flow rate, recommended:
shielding gas flow rate (l/min) = wire diameter (mm) x 10
(e.g. 16 l/min for 1.6 mm wire electrode)
No thermal dissipation as the gas nozzle is too loose
Screw on the gas nozzle as far as it will go
Welding torch operated above the maximum welding current
Reduce welding power or use a more powerful welding torch
The design dimensions of the welding torch are not sufficient for this task
Observe the duty cycle and loading limits
Only on water-cooled systems: inadequate coolant flow
Check coolant level, coolant flow rate, coolant contamination, the routing of
the hosepack, etc.