Cem Dual Mig 120 Manual __top__ Page

Save the PDF to your smartphone and print a waterproof copy for your workshop wall.

Increase the tension on the wire drive rollers and ensure the spool tension is not too tight.

Once the wire emerges from the neck, slide the correct contact tip size (e.g., 0.6mm or 0.8mm) over the wire and screw it tight. Replace the gas shroud. Setting the Parameters: Voltage and Wire Speed

When welding with , use the push technique (forehand welding) to ensure optimal gas coverage over the weld puddle. cem dual mig 120 manual

Getting Started with the CEM Dual MIG 120 : A Hands-On Guide If you’ve recently acquired a CEM Dual MIG 120

Take a clear photo of the wiring schematic usually glued to the inside of the side panel. If yours is missing, that’s the first thing to ask for on hobbyist forums!

Use wire cutters to snip off any bent or kinked portions, leaving a perfectly straight edge. Save the PDF to your smartphone and print

Maintain a distance of 1/4" to 1/2" between the contact tip and the metal workpiece. An excessive stick-out weakens electrical current and destabilizes the arc. 7. Maintenance and Care

Why? Flux-cored wire requires less heat in the base metal and more penetration; reversing polarity reduces spatter.

Keep the gas shroud clean of spatter to ensure even gas flow. Replace the gas shroud

Adjustable dial to match the 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.

This unit is ideal for automotive repairs, light farm maintenance, and hobbyist fabrication. 2. Key Features and Specifications

| Problem | Likely Cause | Solution (from manual) | | :--- | :--- | :--- | | | Poor ground connection | Clean rust/paint from work clamp contact point. | | Excessive spatter | Wrong polarity for wire type | Switch terminals (gas vs gasless setup). | | Wire birdsnest at roller | Drive roller tension too high | Loosen the tension arm slightly. | | Burn-back (wire fuses to tip) | Wire speed too low | Increase wire speed by 1-2 numbers. | | Porosity (holes in weld) | No shielding gas or draft | Check gas bottle regulator; block outdoor fans. | | Machine shuts off mid-weld | Thermal overload activated | Wait 15 minutes for cooling; reduce amperage. |