Unstable arc and spattering
- Wire feeding disturbances
- Poor earth connection to the workpiece
- Worn-out contact tip
- (problem in power source)
Porosity
- Spatters in the gas nozzle and contact tip
- Gas flow rate too low or high
- Damaged gas nozzle
- Gas leakages in the gun or its connections
- Faulty gas flow regulator
- Water leakages in the water cooled gun
Disturbances in the wire feeding
- Feed rolls are slipping
- Blocked or worn-out wire conduit
- Wire conduit too long or too short
- Wire reel brake too tight or loose
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