If you find a manual for a CEM Dual MIG 100 or 150, it is likely very similar to the 120. The internal components and operation principles are usually standardized across the range.
When your welds don’t look right, consult this troubleshooting table derived from the . cem dual mig 120 manual
The LED light will turn on if the duty cycle is exceeded. Stop welding and let the fan cool the machine for 5-10 minutes. Poor Arc Quality: If you find a manual for a CEM
Usually caused by a worn contact tip or a kinked liner. Replace the tip frequently. The LED light will turn on if the duty cycle is exceeded
The MIG 120 usually comes with reversible drive rolls for 0.6mm or 0.8mm wire. Ensure the groove matches your wire size.
Standard industrial units of this class often operate at a 30% duty cycle at peak amperage. Operating Instructions Weldcorp MIG Welder Operating Manual | PDF - Scribd