Fronius MTG 250i Instructions De Service page 52

The welding torch becomes very hot
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Contact tip has a short service life
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
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.
52
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 wire-
feeder 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