Fronius MTG 400i K4 Manual De Instrucciones página 46

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Poor wirefeeding
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Gas nozzle gets very hot
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46
Wirefeed components do not correspond to the diameter of the wire
electrode/the material of the wire electrode
Use correct wirefeed components
Depending on the system, brakes in the wirefeeder or power source
set too tightly
Set the brakes to be looser
Hole in the contact tip displaced
Replace contact tip
Faulty inner liner or wire-guide insert
Check inner liner or wire-guide insert for kinks, soiling, etc.
Defective inner liner, replace defective wire-guide insert
Feed rollers not suitable for wire electrode used
Use suitable feed rollers
Incorrect contact pressure of the feed rollers
Optimize contact pressure
Feed rollers soiled or damaged
Clean or replace feed rollers
Inner liner displaced or kinked
Replace inner liner
Inner liner too short after cutting to length
Replace inner liner and cut new inner liner to correct length
Wear of the wire electrode due to excessive contact pressure at the
feed rollers
Reduce contact pressure at the feed rollers
Wire electrode soiled or rusted
Use high-quality wire electrode without soiling
For steel inner liners: use of uncoated inner liner
Use coated inner liner
Clamping nipple deformed in wire entry and exit area (oval, worn out),
shielding gas escaping at clamping nipple
Replace clamping nipple to ensure gas tightness
No heat dissipation due to gas nozzle being fitted too loosely
Screw the gas nozzle tightly up to the stop