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Fronius Robacta Drive CMT W Manual De Instrucciones página 67

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Contact tube only has a short service life
Cause:
Welding wire worn due to heavy contact pressure at the feed rollers
Remedy:
Reduce contact pressure at the feed rollers
Cause:
Wrong dimension of contact tube
Remedy:
Use a contact tube of the correct dimension
Cause:
Duty cycle of welding torch has been exceeded
Remedy:
Shorten the ON times or use a higher-capacity torch
Cause:
Contact tube has overheated. No thermal dissipation, as the contact
tube is fitted too loosely
Cause:
Tighten the contact tube
NOTE!
When using CrNi, the contact tube may be subject to a higher degree of wear
due to the nature of the surface of CrNi welding wire.
Wirefeed buttons do not work
Cause:
Plug-in connections of „control line/power source" faulty
Remedy:
Check plug connection / Contact After-Sales Service
Cause:
Control line is faulty
Remedy:
Replace control line / Contact After-Sales Service
Weld seam porosity
Cause:
Soiled gas nozzle, causing inadequate gas-shielding of the weld seam
Remedy:
Remove welding spatter
Cause:
Either the shielding gas hose has holes in it, or the hose is not con-
nected properly
Remedy:
Change the shielding gas hose, ensure the hose is connected properly
Cause:
The O-ring seals on the connection points are faulty
Remedy:
Change the O-ring seals
Cause:
Moisture/condensation in the shielding gas hose
Remedy:
Dry the shielding gas hose
Cause:
Shielding gas flow is either too high or too low
Remedy:
Correct the shielding gas flow
Cause:
Insufficient shielding-gas flow at the beginning or end of welding
Remedy:
Increase gas pre-flow or gas post-flow
Cause:
Rusty or poor quality welding wire
Remedy:
Use high-quality welding wire with no impurities
Cause:
Too much parting agent applied
Remedy:
Wipe off excess parting agent / apply less parting agent
67

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