Usually supports 0.023" (0.6mm) to 0.035" (0.9mm) wire. 3. Setup Instructions (From the CEM MIG 120 Manual)
What (if any) are you experiencing with the machine?
Check the work clamp connection to the base metal. Ensure the ground clamp is on clean metal.
Connect the MIG torch to the Positive (+) terminal and the ground clamp to the Negative (-) terminal (DCEP - Direct Current Electrode Positive).
Connect your earth clamp to clean, bare metal on your workpiece. Ensure paint, rust, and scale are ground away. cem dual mig 120 manual
Put on your welding PPE (Auto-darkening mask, leather gloves, flame-resistant jacket).
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
Capable of welding mild steel, stainless steel, and occasionally aluminum with the correct wire and gas setup. 2. Operational Highlights
If you have lost your physical copy, do not rely on guesswork. Download the official PDF today, keep it accessible, and always consult the troubleshooting section before assuming your machine is broken. Usually supports 0
Setting 1 + Min: Lowest power output (ideal for thin car bodywork). Setting 1 + Max: Low-medium power. Setting 2 + Min: Medium-high power.
Proper setup is crucial for the performance of your welder. Follow these steps to prepare your CEM Dual MIG 120 A. Installing the Wire Spool Access the wire feed mechanism.
A loud, crisp crackle like frying bacon indicates a perfect balance of voltage and wire speed.
One of the most common mistakes is forgetting to change the polarity. The manual clearly shows: Check the work clamp connection to the base metal
Typically a set of rocker switches (Min/Max and 1/2) providing four distinct voltage positions to control heat and penetration depth.
Clean the groove in the drive roller with a wire brush to prevent wire slippage. ❌ Troubleshooting Common Issues Likely Cause Machine won't turn on No input power or blown fuse Check the wall socket and plug fuse. Wire slips or doesn't feed Too little tension or worn roller Tighten the tension knob or replace the roller. Excessive spatter / Porous welds Lack of gas or wrong polarity Check gas levels or switch polarity layout. Wire sticks to contact tip Wire speed too slow or tip worn Increase wire speed or replace the tip. Machine suddenly stops welding Thermal overload tripped Leave the machine turned ON so the fan can cool it. What thickness of metal are you trying to weld?
The manual warns that a 20% duty cycle at 120A means you can weld for 2 minutes, then must rest for 8 minutes. Exceeding this trips the thermal overload protector (the red light on the front panel).