Cem Dual Mig 120 Manual ((hot)) Guide
Generally rated at 10% to 15% at maximum output (120A), scaling up to 60% or 100% at lower amperage settings (e.g., 40A–50A)
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Spray the inside of the gas shroud with anti-spatter spray to prevent metal droplets from bridging the gap between the live tip and the grounded shroud.
Lay the MIG torch cable out completely straight on the floor to minimize resistance inside the liner. cem dual mig 120 manual
Torch must be Positive (+) , Earth/Ground Clamp must be Negative (-) . Wire: Solid steel wire (0.6mm or 0.8mm ER70S-6).
Argon/CO2 mix (80/20 or 75/25) for mild steel; Pure CO2 can be used for deeper penetration on thicker steel but causes more spatter.
Clip the end of the welding wire with sharp wire cutters to remove any kinks. Ensure the tip is perfectly straight. Generally rated at 10% to 15% at maximum
Check the thermal overload indicator. If illuminated, leave the machine turned on so the internal fan can cool down the transformer. It will auto-reset in 10 to 15 minutes. Safety Precautions
Lock the tensioner arm down. Apply moderate tension; over-tightening will crush the wire or damage the motor gear. 4. Operation: Striking an Arc
Understanding the limits and electrical footprint of the CEM Dual MIG 120 prevents component damage and ensures optimal arc stability. Specification Details 220V – 240V AC, Single-Phase, 50/60 Hz Maximum Output Current 120 Amperes Welding Current Range 30A to 120A (multi-step adjustable) Duty Cycle Capacity Can’t copy the link right now
| Specification | Detail | | :--- | :--- | | | 120V AC, 60Hz, 20A breaker recommended | | Output Current | 30 – 120 Amps (DC) | | Duty Cycle | 15% @ 120A (6 minutes on, 34 minutes cooling) | | Wire Diameter | 0.023” – 0.035” (0.6mm – 0.9mm) | | Spool Capacity | 2 lb (0.9 kg) or 8 lb (3.6 kg) with adapter | | Welding Processes | MIG (GMAW) & Flux-Cored (FCAW) | | Weight | 18.5 lbs (8.4 kg) |
| 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. |
Direct-connection (non-Euro style) MIG torch with a trigger switch, gas diffuser, contact tip, and shroud.