Fronius MTG 250i Manual De Instrucciones página 58

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Poor wirefeeding
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The gas nozzle becomes very hot
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58
Wirefeed components do not match the diameter of the wire electro-
de/wire electrode material
Use the correct wirefeed components
Depending on the system, brake force in wirefeeder or power source
set too high
Reduce the brake force
Hole in the contact tip is displaced
Change the contact tip
The inner liner or wire-guide insert is defective
Check the inner liner and wire-guide insert for kinks, dirt, etc.
Change the defective inner liner or wire-guide insert
The feed rollers are not suitable for the wire electrode being used
Use suitable wirefeeder rollers
Wirefeeder rollers have the wrong contact pressure
Optimise contact pressure
The wirefeeder rollers are soiled or damaged
Clean or replace wirefeeder rollers
Inner liner wrongly fitted or kinked
Replace inner liner
The inner liner has been cut too short
Replace the inner liner and cut the new inner liner to the correct
length
Wire electrode worn due to excessive contact pressure on the wire-
feeder rollers
Reduce contact pressure on the wirefeeder rollers
Wire electrode contains impurities or is corroded
Use high-quality wire electrode with no impurities
For steel inner liners: use of uncoated inner liner
Use a coated inner liner
Clamping nipple in wire entry and wire exit area deformed (oval, kno-
cked out), shielding gas escaping at clamping nipple
Replace clamping nipple to ensure a gas-tight seal
No thermal dissipation as the gas nozzle is too loose
Screw on the gas nozzle as far as it will go