Keep your CEM Dual MIG 120 operational by addressing common wear-and-tear points. Common Troubleshooting Scenarios:
Controls how fast the wire exits the torch nozzle. This must be balanced proportionally with your voltage setting.
When changing wire spools, blow compressed air through the torch liner from the machine end to remove metal shavings and dust. Comprehensive Troubleshooting Guide Probable Cause Recommended Solution Wire slips or stops feeding
Comprehensive Guide to the CEM Dual MIG 120 Welder The CEM Dual MIG 120 is a classic, versatile compact welding machine prized by DIY enthusiasts, automotive hobbyists, and light fabrication shops. Whether you have recently acquired a second-hand unit or unearthed an old reliable machine from your garage, having a clear understanding of its operation is vital. Because original printed manuals for legacy CEM machines can be exceptionally difficult to find today, this comprehensive guide serves as your functional manual, setup instructor, and troubleshooting assistant. 1. Technical Specifications & Overview
Lack of gas shielding; wind blowing gas away; wrong polarity. cem dual mig 120 manual
Leave machine ON. Allow fan to run for 10-15 minutes until light clears. Blocked contact tip or heavy liner drag Replace the copper contact tip and inspect the liner. Weak arc penetration Ground clamp on dirty surface / Low voltage
The CEM Dual MIG 120 is a classic, compact gas/gasless wire-feed welder highly valued by DIY enthusiasts, automotive restorers, and light-duty fabricators. Manufactured by the Italian company CEM (Costruzioni Elettromeccaniche Ancona), this machine is known for its robust transformer-based build and reliability.
Loosen the tension adjustment screw on the wire drive mechanism and flip down the pressure arm.
The CEM Dual MIG 120 is a dual MIG welding machine featuring: Keep your CEM Dual MIG 120 operational by
Tighten the drive roller tensioner, ensuring the wire feeds smoothly without slipping. B. Setting Up for MIG (Gas) Welding
Slide the wire spool onto the spindle, ensuring it feeds from the bottom.
Check the torch nozzle frequently for spatter accumulation. Clean it out using MIG pliers and apply anti-spatter spray to prevent build-up.
The torch should be Positive (+), and the earth clamp Negative (-). When changing wire spools, blow compressed air through
A: The most common symptom is an inconsistent wire feed that you cannot correct by adjusting the drive roll tension. If you feel unusual resistance when pushing the wire through the torch by hand, or if the wire feed "stutters" while welding, the liner is likely dirty, kinked, or worn out.
Cut the wire protruding from the torch shroud so it extends roughly 6–10mm (Stick-out).
A key point to remember is that CEM is now , an Italian company. While they list the Dual Mig 120 on their website, they no longer provide support for this older model. This lack of official backing is a challenge, but the strong community around this welder often makes troubleshooting and finding parts possible through shared knowledge and generic alternatives.
DCEN (Direct Current Electrode Negative). The torch lead connects to the negative (-) terminal; the ground clamp connects to the positive (+) terminal. Wire Type: Flux-cored gasless wire (E71T-GS).
