Fronius MTG 250i Bedienungsanleitung Seite 48

Contact tip has a short service life
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Risk when using CrNi wire electrodes
This may result in a higher degree of contact tip wear.
► When using CrNi, the contact tip may be subject to a higher degree of wear due to the
Torch trigger malfunction
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48
Incorrect wirefeeder rollers
Use correct wirefeeder rollers
Wire electrode worn due to excessive contact pressure on the wirefeeder roll-
ers
Reduce contact pressure on the wirefeeder rollers
Wire electrode contains impurities/is corroded
Use high-quality wire electrode with no impurities
Uncoated wire electrode
Use wire electrode with suitable coating
Wrong dimension of contact tip
Use a contact tip of the correct dimension
Duty cycle of welding torch has been exceeded
Shorten the duty cycle or use a more powerful welding torch
Contact tip has overheated. No thermal dissipation as the contact tip is too
loose
Tighten the contact tip
NOTE!
nature of the surface of the CrNi wire electrode.
Defective plug connection between welding torch and power source
Establish proper plug connections / have power source or welding torch ser-
viced
Build up of dirt between torch trigger and torch trigger housing
Clean away the dirt
Control line is faulty
Contact After-Sales Service