Fronius MTG 250i Manual De Instrucciones página 48

The welding torch becomes very hot
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Remedy:
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Contact tip has a short service life
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Remedy:
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NOTE!
When using CrNi, the contact tip may be subject to a higher degree of wear due to
the nature of the surface of the CrNi wire electrode.
48
Only on Multilock welding torches: torch neck union nut is loose
Tighten the union nut
Welding torch operated above the maximum welding current
Reduce welding power or use a more powerful welding torch
The specification of the welding torch is inadequate
Observe the duty cycle and loading limits
Only on water-cooled systems: Inadequate coolant flow
Check coolant level, coolant flow, coolant contamination, the routing of the
hosepack, etc.
The tip of the welding torch is too close to the arc
Increase stick-out
Incorrect wirefeeder rollers
Use correct wirefeeder rollers
Wire electrode worn due to excessive contact pressure on the wirefeeder
rollers
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