Usually caused by a blockage in the tip or too much tension on the drive rolls.
This potentiometer controls how fast the motor pushes the wire. This must be tuned by ear—you’re looking for a consistent "sizzling bacon" sound. cem dual mig 120 manual
While the original printed manuals for CEM machines are becoming harder to find, the internal circuitry is very similar to many SIP or Clarke welders of the same era. Usually caused by a blockage in the tip
These are consumables. If the wire is "stuttering," replace the copper tip at the end of the torch. cem dual mig 120 manual
Keep the gas shroud clean of spatter to ensure even gas flow.