Cem Dual Mig 120 Manual ✦ Full

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

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

CEM Dual MIG 120 Manual

Table of Contents

1. Safety Precautions
2. Introduction
3. Technical Specifications
4. Equipment Description
5. Installation and Setup
6. Operating Instructions
7. Welding Techniques
8. Maintenance and Troubleshooting
9. Accessories and Replacement Parts
10. Warranty and Disclaimer

1. Safety Precautions

• Always follow proper safety procedures when working with electrical and welding equipment.
• Wear protective gear, including gloves, safety glasses, and a welding helmet.
• Ensure proper ventilation and avoid inhaling fumes or gases emitted during welding.
• Keep the work area clean and free from flammable materials.
• Never touch electrical components or welding equipment with wet hands or while standing on a conductive surface.

2. Introduction

Congratulations on purchasing the CEM Dual MIG 120, a high-performance welding machine designed for professional and hobbyist use. This manual provides comprehensive instructions for safe and effective operation, maintenance, and troubleshooting.

3. Technical Specifications

• Input Voltage: 230V, 50Hz
• Power Consumption: 6.5 kW
• Welding Current Range: 30-120A
• Welding Voltage Range: 10-20V
• Wire Feed Speed: 1.5-15m/min
• Duty Cycle: 60% at 100A, 30% at 120A
• Weight: 45kg
• Dimensions: 550x350x450mm

4. Equipment Description

The CEM Dual MIG 120 is a dual MIG welding machine featuring:

• Two separate welding torches for simultaneous welding
• Digital display for easy setting of welding parameters
• Adjustable wire feed speed and welding current
• Thermal overload protection
• Overheating protection

5. Installation and Setup

1. Unpack the machine and inspect for damage.
2. Place the machine on a flat, stable surface.
3. Connect the power cord to a suitable power outlet.
4. Connect the welding torches to the machine.
5. Set the welding parameters using the digital display.

6. Operating Instructions

1. Prepare the workpiece by cleaning and grinding.
2. Set the welding parameters according to the material and thickness.
3. Hold the welding torch at a 10-20° angle.
4. Start the welding process by pressing the torch trigger.
5. Maintain a consistent welding speed and arc length.

7. Welding Techniques

• MIG welding techniques:
  • Short circuiting (GMAW-S)
  • Globular (GMAW-G)
  • Spray (GMAW-S)
• Welding positions:
  • Flat
  • Horizontal
  • Vertical
  • Overhead

8. Maintenance and Troubleshooting

• Regular maintenance:
  • Clean the machine and torches regularly.
  • Check and replace worn or damaged parts.
• Troubleshooting:
  • Machine not turning on: check power cord and circuit breaker.
  • Welding arc unstable: check welding parameters and torch condition.

9. Accessories and Replacement Parts

• Available accessories:
  • Welding torches
  • Welding wires
  • Shielding gases
• Replacement parts:
  • Contact tips
  • Wire feed rollers
  • Torch liners

10. Warranty and Disclaimer

The CEM Dual MIG 120 is covered by a limited warranty. For details, please refer to the warranty document provided with the machine.

By using the CEM Dual MIG 120, you acknowledge that you have read and understood the instructions and safety precautions outlined in this manual.

Revision History

• Revision 1.0: Initial release

Contact Information

For technical support, please contact:

CEM Welding Technologies [insert address] [insert phone number] [insert email]

Appendix

• Welding Parameter Guide
• Material Thickness Guide
• Troubleshooting Chart

Title: The Essential Guide to Finding and Using the CEM Dual MIG 120 Manual

If you’ve just picked up a second-hand CEM Dual MIG 120, or you’re trying to get an old workshop workhorse back in action, you’ve likely run into the same problem as many other welders: the paperwork is missing. CEM (City Engineering Manufacture) machines are known for being robust, British-made welders, but they are older machines, and original printed manuals are becoming collector's items.

In this post, we’ll cover what you need to know about the CEM Dual MIG 120, where to find the manual, and the key settings you need to get welding today.

Usability & Setup

• Wire feed: Direct-drive feeder; smoothness depends on tension adjustment and wire spool size. Occasional birdnesting can occur if tension and liner are not set correctly.
• Gas vs Gasless: Some variants support gas MIG and flux-core (gasless) operation; manual typically explains switching the tip and using a regulator. Gas model requires correct shielding gas and regulator hookup—manual provides basic guidance.
• Polarity & Connections: Manual covers polarity for solid wire (DCEN/DCWP) and flux-cored; ground clamp and torch connections are standard.
• Portability: Lightweight and easy to move; suitable for small jobs on-site or at home.

Pros and Cons

Pros:

• Reliability: These machines are known to last decades.
• Torch Compatibility: The Euro connector is a massive long-term benefit.
• Arc Quality: Excellent for thin metal and automotive bodywork.
• Parts Availability: Being a major European brand, spares (tips, liners, feed rolls, contactors) are readily available through professional welding supply stores.
• No Electronics Headaches: Unlike cheap inverters, if a CEM transformer machine fails, it is usually a simple fix (a capacitor or a relay) rather than a fried circuit board that cannot be replaced.

Cons:

• Weight: It is heavier than modern inverter technology machines.
• Limited Power: At 120 Amps, you cannot weld heavy structural steel (anything over 4mm-5mm will require multiple passes or be impossible to penetrate fully).
• Manual Adjustments: This is an older-school machine. It does not have digital screens or "synergic" automatic settings where you just pick the material thickness. You have to dial in the voltage and wire speed yourself.

5. Operating Instructions

3.2 Electrical Safety

• Connect to a grounded outlet with delayed-action circuit breaker (C-curve).
• Never use on wet surfaces or in rain.
• Input cable must be undamaged; replace immediately if cut or frayed.

7. Maintenance Schedule (As per Manual)

| Interval | Action | |-------------------|-------------------------------------------------------------------------| | Every use | Clean nozzle, remove spatter. Check contact tip for wear. | | Weekly (light use)| Blow out machine interior with compressed air (unplugged). | | Monthly | Inspect ground cable, torch liner, and drive roll for wear. | | Every 6 months | Replace liner if feed issues persist. Lubricate drive mechanism (dry – no oil on wire). |