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Poor welding properties
Cause:
Contact tube does not fit or is damaged
Remedy:
Change the contact tube
Cause:
Wrong wire alloy or wrong wire diameter
Remedy:
Check the wirespool that has been inserted, check the weldability of the base metal
Cause:
The shielding gas is not suitable for this wire alloy
Remedy:
Use the correct shielding gas
Cause:
Unfavourable welding conditions: shielding gas is contaminated (by moisture, air), inadequate gas
shielding (weld pool „boiling", draughts), contaminants in the workpiece (rust, paint, grease)
Remedy:
Optimise the welding conditions
Cause:
Gas nozzle soiled
Remedy:
Remove welding spatter
Cause:
Turbulence caused by too high a rate of shielding gas flow
Remedy:
Reduce amount of shielding gas, recommended:
shielding gas quantity (l/min) = wire diameter (mm) x 10
(e.g. 16 l/min for 1.6 mm wire electrode)
Cause:
Too large a distance between the contact tube and the workpiece.
Remedy:
Reduce the distance between the contact tube and the workpiece (approx. 10-15 mm)
Cause:
Tilt angle of the welding torch is too great
Remedy:
Reduce the tilt angle of the welding torch
Cause:
The wirefeed components do not match the wire electrode diameter
Remedy:
Use the correct wirefeed components
Cause:
Loss of gas or extraneous air
Remedy:
Check leak-tightness of blow-through line and blow-through valve. Check closure seal of blow-
through line (push-on nipple)
Poor wirefeed
Cause:
Wire does not fit
Remedy:
Check the position of the wire inlet nozzle relative to the feed rollers, and correct as necessary
Cause:
Brake force on the CMT wirefeeder set too high
Remedy:
Set the brake on the CMT wirefeeder to a looser setting
Cause:
Hole in contact tube constricted due to deposits
Remedy:
Change the contact tube
Cause:
The wire feed inner liner or wire feed insert is defective
Remedy:
Check the wire feed inner liner and wire feed insert for kinks, dirt, etc. ; change the faulty liner or
wire feed insert
Cause:
The wirefeed rollers are not suitable for the wire electrode being used
Remedy:
Use suitable wire feed rollers
Cause:
The wirefeed rollers are exerting the wrong contact pressure
Remedy:
Check the contact pressure, adjust if necessary
Cause:
The wirefeed rollers are soiled or damaged
Remedy:
Clean the wirefeed rollers or exchange them for new ones
Cause:
Inner line was kinked while being inserted
Remedy:
When inserting the inner liner, only handle it around the infeed tube
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