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Miller Millermatic 212 - User Manual

Miller Millermatic 212
44 pages
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Processes
Description
Arc Welding Power Source
and Wire Feeder
OM-232 384A 2007−03
Visit our website at
www.MillerWelds.com
Millermatic 212
R
Flux Cored (FCAW) Welding
MIG (GMAW) Welding
File: MIG (GMAW)

Table of Contents

Questions and Answers

Summary

SECTION 1 - SAFETY PRECAUTIONS - READ BEFORE USING

1-1. Symbol Usage

Explains hazard warning symbols and special safety messages used in the manual.

1-2. Arc Welding Hazards

Details potential dangers like electric shock, fumes, arc rays, and fire during arc welding.

1-3. Additional Symbols For Installation, Operation, And Maintenance

Covers symbols for fire, falling units, moving parts, static, and wire hazards.

1-4. California Proposition 65 Warnings

Lists chemicals known to cause birth defects or cancer from welding/engines.

1-5. Principal Safety Standards

Lists key safety standards and organizations for welding and cutting.

1-6. EMF Information

Discusses electromagnetic fields from welding and ways to minimize exposure.

SECTION 3 - DEFINITIONS

3-1. Symbols And Definitions

Provides a visual guide to symbols used for wire feed, voltage, duty cycle, and gas.

SECTION 4 - INSTALLATION

4-1. Welding Power Source And MIG Gun Specifications

Outlines power source ratings, duty cycle, and wire specifications.

4-2. Welding Power Source Duty Cycle And Overheating

Explains duty cycle percentages and risks of overheating the welding unit.

4-3. Volt-Ampere Curves

Shows minimum/maximum voltage and amperage output capabilities of the unit.

4-4. Connecting To Weld Output Terminals

Details the correct procedure for connecting weld cables to output terminals.

4-5. Installing Work Cable And Clamp

Guides on routing the work cable and attaching the clamp to the machine.

4-6. Connecting An Optional Spool Gun

Instructions for connecting a spool gun, including plug and terminal connections.

4-7. Setting Gun Polarity For Wire Type

Explains how to change polarity for different wire types like solid steel or flux core.

4-8. Installing Gas Supply

Steps for connecting shielding gas cylinders, regulators, and hoses to the welder.

4-9. Installing MIG Wire Spool and Adjusting Hub Tension

Guides on loading wire spools and setting the correct hub tension for feeding.

4-10. Positioning Jumper Links

Instructions for setting input voltage by positioning jumper links inside the unit.

4-11. Electrical Service Guide

Provides fuse ratings, circuit breaker recommendations, and conductor sizes for electrical service.

4-12. Selecting A Location And Connecting Input Power

Advises on choosing a location and connecting the unit to the correct input power.

4-13. Threading Welding Wire

Step-by-step guide for threading welding wire through the drive rolls and gun.

SECTION 5 - OPERATION

5-1. Controls

Identifies and explains the function of the voltage and wire speed controls.

5-2. Weld Parameter Chart

Offers suggested settings for wire types, shielding gases, and wire sizes for different materials.

SECTION 6 - MAINTENANCE & TROUBLESHOOTING

6-1. Routine Maintenance

Outlines regular maintenance tasks like checking, cleaning, and replacing parts.

6-2. Unit Overload

Explains the function of thermal protection and the Over Temp light.

6-3. Changing Drive Roll and Wire Inlet Guide

Provides instructions for replacing drive rolls and inlet guides for wire feeding.

6-4. Aligning Drive Rolls and Wire Guide

Details how to align drive rolls and wire guides for proper wire feeding.

6-5. Troubleshooting

Lists common welding problems and their remedies for wire feed and output issues.

SECTION 7 - ELECTRICAL DIAGRAM

SECTION 8 - MIG WELDING (GMAW) GUIDELINES

8-1. Typical MIG Process Connections

Illustrates the standard setup for a MIG welding process with gas and workpiece.

8-2. Typical MIG Process Control Settings

Provides guidance on selecting wire size, speed, and voltage based on material thickness.

8-3. Holding And Positioning Welding Gun

Explains correct techniques for holding and positioning the welding gun for various welds.

8-4. Conditions That Affect Weld Bead Shape

Details how gun angles, stickout, travel speed, and voltage influence weld bead appearance.

8-5. Gun Movement During Welding

Describes stringer and weave bead techniques for different joint types.

8-6. Poor Weld Bead Characteristics

Illustrates common weld defects like spatter, rough beads, and poor penetration.

8-7. Good Weld Bead Characteristics

Shows examples of desirable weld beads with fine spatter and good penetration.

8-8. Troubleshooting - Excessive Spatter

Lists causes and corrective actions for excessive spatter during welding.

8-9. Troubleshooting - Porosity

Identifies causes and solutions for porosity (gas pockets) in weld metal.

8-10. Troubleshooting - Excessive Penetration

Explains how to fix excessive weld penetration by adjusting settings.

8-11. Troubleshooting - Lack Of Penetration

Provides remedies for welds with insufficient penetration into the base metal.

8-12. Troubleshooting - Incomplete Fusion

Details how to correct incomplete fusion between weld metal and base metal.

8-13. Troubleshooting - Burn-Through

Offers solutions for burn-through, where weld metal melts through the base metal.

8-14. Troubleshooting - Waviness Of Bead

Addresses causes and fixes for wavy weld beads, often due to wire extension or unsteady hand.

8-15. Troubleshooting - Distortion

Explains how to minimize distortion caused by weld metal contraction during welding.

8-16. Common MIG Shielding Gases

A chart listing common shielding gases and their applications in MIG welding.

8-17. Troubleshooting Guide For Semiautomatic Welding Equipment

A guide to diagnosing and fixing issues with wire feed motor, gas flow, and arc stability.

SECTION 9 - PARTS LIST

9-1. Drive Roll And Wire Guide Kits

Lists drive roll and wire guide kit part numbers and recommended usages.

WARRANTY

Miller Millermatic 212 Specifications

General IconGeneral
BrandMiller
ModelMillermatic 212
CategoryWelding System
LanguageEnglish

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