This is the most critical step in the CEM Dual MIG 120 manual.
Why? Flux-cored wire requires less heat in the base metal and more penetration; reversing polarity reduces spatter.
This is the most critical adjustment.
The CEM Dual Mig 120 (often branded as the "Due Mig" or similar to SIP models) is a versatile 120A welder capable of both gas and gasless (flux-cored) operation. While original CEM manuals can be rare, it shares many operational characteristics with standard 120A MIG units like the Weldcorp MIG 120. Key Specifications Input Voltage: Typically 230V single-phase.
Welding Current: 40A to 120A range (often listed up to 170A for peak outputs in some "Due Mig" variants).
Wire Compatibility: 0.6mm and 0.8mm solid wire; 0.9mm to 1.0mm flux-cored wire.
Dual Function: Supports gas shielding (Argon/CO2 mix) or gasless welding (flux-cored). Core Operation Guide cem dual mig 120 manual
Polarity Setup: For gasless (flux-core) welding, the MIG gun should typically be connected to the negative terminal and the work clamp to the positive. For gas-shielded solid wire, this is usually reversed (Gun +, Clamp -).
Wire Loading: Slide the spool onto the holder so it unrolls from the bottom. Feed the wire through the guide and into the drive rolls, ensuring the groove on the roller matches your wire diameter (e.g., 0.8mm).
Tension Adjustment: Tighten the drive roll tension until the wire feeds steadily. A common test is to feed the wire against a piece of wood from 2 inches away; it should curl rather than stop.
Setting the Arc: Adjust wire speed first based on material thickness. Your voltage (heat) should then be dialed in to achieve a "frying bacon" sound. Common Troubleshooting Tips CEM mig welder - Yesterday's Tractors
Getting Started with the CEM Dual MIG 120 : A Hands-On Guide If you’ve recently acquired a CEM Dual MIG 120
(often branded under the Cemont line), you’ve got a versatile, entry-level workhorse designed for hobbyists and light automotive repairs. Whether you found one second-hand or it’s been sitting in your garage, finding a clear manual can be tricky since the brand has evolved over the years. This is the most critical step in the
This post breaks down the essential operations, setup, and troubleshooting tips typically found in the CEM Dual MIG 120 manual to get you up and running. Core Specifications CEM Dual MIG 120
is designed for simplicity and portability. While specific specs can vary by exact sub-model, standard 120A units typically feature: Input Power: 230V Single-phase. Welding Range: Approximately 20A to 120A.
Wire Compatibility: Supports 0.6mm to 0.8mm solid wire (with gas) and up to 1.0mm flux-cored wire (gasless).
Duty Cycle: Generally rated around 10%–35% at max amperage, meaning it’s best suited for shorter bursts of welding rather than continuous industrial use. Step-by-Step Setup Guide
Follow these standard steps found in most MIG 120 manuals to ensure a safe and clean arc: 1. Loading the Wire Spool
Access the Drive: Open the side panel. Remove the spindle lock nut and place your wire spool onto the spindle. The CEM Dual Mig 120 (often branded as
Check the Rollers: Ensure the drive roll groove matches your wire size (e.g., 0.6mm or 0.8mm). The size is usually stamped on the side of the roller.
Tensioning: Feed the wire through the guide tube, across the rollers, and into the torch liner. Tighten the tension arm just enough so the wire feeds smoothly without slipping; over-tightening can cause bird-nesting. 2. Gas vs. Gasless Configuration
Gasless (Flux-Core): If you are using flux-core wire, you do not need a gas cylinder. Ensure your polarity is set correctly—most gasless setups require the torch to be DC Negative.
Gas (Solid Wire): Connect your shielding gas (typically a 75/25 Argon/CO2 mix) to the rear inlet. Set your flow meter between 10 to 15 CFH (cubic feet per hour) for standard indoor conditions. 3. Setting Your Parameters The front panel typically features two main knobs: MIG Welder Settings: MIG Welding Basics for Beginners
Check that the gas solenoid is clicking. If not, the manual advises testing the trigger continuity with a multimeter. Also, ensure the gas regulator is open and the hose isn’t kinked.
The CEM Dual MIG 120 usually features a switch or tapped voltage control (Low, Medium, High) or a numbered dial (1 through 5 or 6).
No. The CEM Dual MIG 120 Standard has a manual with analog dials. The Pro model uses digital readouts. Always download the manual specific to your serial number.
The CEM Dual MIG 120 manual recommends the following routine: