Cem Dual Mig 120 Manual Verified Jun 2026
Increase voltage switch setting or turn down the wire speed. If using gasless wire, swap polarity to Torch Negative (-). Thermal overload protection has activated.
Close the pressure arm and set the tension knob (do not overtighten). 🎛️ Control Panel and Operation
Clip the end of the welding wire with sharp wire cutters to remove any kinks. Ensure the tip is perfectly straight. cem dual mig 120 manual
The front panel of the CEM Dual Mig 120 keeps controls simple and intuitive. Turns the machine on and off.
Note: 4.0mm steel pushes the absolute limit of a 120-amp machine. Be sure to bevel the edges of thick material to achieve adequate weld penetration. Troubleshooting Guide Probable Cause Corrective Action Too little tension on drive roller Tighten the tension arm knob slightly. Birdnesting (wire tangled at roller) Cut wire, clear tangle, clean liner, and adjust tension. Wrong contact tip size Replace with a tip matching your wire diameter. Excessive spatter and porous welds Incorrect polarity Check interior leads; swap for Gas vs. Gasless mode. Lack of shielding gas Check gas cylinder levels, regulator flow, and hose leaks. Rusty or oily metal Clean workpiece thoroughly with a wire brush or grinder. Machine suddenly stops working Duty cycle exceeded Leave machine turned ON so the fan runs; wait 10 minutes. Weak arc / Poor penetration Voltage setting too low Increase the Min/Max or 1/2 switch combinations. Bad ground connection Increase voltage switch setting or turn down the wire speed
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Provides 4 distinct heat settings. Setting 1 (Min/1): Lowest heat for very thin sheet metals. Setting 2 (Min/2): Medium-low heat. Setting 3 (Max/1): Medium-high heat. Close the pressure arm and set the tension
Slide the correct size contact tip over the wire, thread it tightly into the gas diffuser, and snap the gas nozzle back into place. Maintenance and Consumables
Because the CEM Dual MIG 120 relies on simple electromechanical components rather than complex digital circuit boards, most issues can be diagnosed manually. Common Troubleshooting Scenarios Probable Cause Corrective Action
Yes, but you need a Teflon liner, 100% argon gas, and 0.035” aluminum wire. The manual warns that aluminum requires a push-pull torch for best results; the standard torch may cause birdnesting.
