Lincoln Electric PRO 100 manual Gmaw MIG Welding ARC, Process Selection, For Gmaw MIG Process

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B-8

LEARNING TO WELD

B-8

 

 

 

The “arc stream” is seen in the middle of the picture. This is the electric arc created by the electric current flowing through the space between the end of the wire electrode and the base metal. The temperature of this arc is about 6000°F, which is more than enough to melt metal. The arc is very bright, as well as hot, and cannot be looked at with the naked eye without risking painful injury. The very dark lens, specifically designed for arc welding must be used with the hand or face shield whenever viewing the arc.

The arc melts the base metal and actually digs into it much as water through a nozzle on a garden hose digs into the earth. The molten metal forms a molten pool or crater and tends to flow away from the arc. As it moves away from the arc, it cools and solidifies.

The function of the Innershield cored wire electrode is much more than simply to carry current to the arc. The wire core is composed of fluxes and/or alloying ingre- dients around which a steel sheath has been formed. It is simply a stick electrode turned inside out in a con- tinuous wire form.

The cored wire melts in the arc and tiny droplets of molten metal shoot across the arc into the molten pool. The wire sheath provides additional filler metal for the joint to fill the groove or gap between the two pieces of base metal.

The core materials also melt or burn in the arc and perform several functions. They make the arc stead- ier, provide a shield of smoke-like gas around the arc to keep oxygen and nitrogen in the air away from the molten metal, and provide a flux for the molten pool. The flux picks up impurities and forms the protective slag on top of the weld during cooling.

After running a weld bead, the slag may be removed with a chipping hammer and wire brush. This improves appearance and allows for inspection of the finished weld.

Since machine size and output characteristics limit the size and type of wire electrode which can be used, Lincoln 0.035" and 0.045" (0.9 and 1.2 mm) NR-211- MP Innershield electrode is recommended for Self- Shielded Flux Cored Arc Welding with this machine.

THE GMAW (MIG) WELDING ARC

Figure B.10 illustrates the GMAW (MIG) welding arc. Solid wire does not contain fluxes or ingredients to form its own shielding and no slag forms to protect the molten weld metal. For this reason, a continuous even flow of shielding gas is needed to protect the molten weld metal from atmospheric contaminants such as oxygen and nitrogen. Shielding gas is supplied through the gun and cable assembly, through the gas nozzle and into the welding zone.

 

 

 

 

Gas nozzle

 

 

 

 

Shielding gas

 

Solid wire

 

electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weld metal

Base metal

 

 

 

 

 

 

FIGURE B.10

When comparing the GMAW and FCAW processes, you can see that the principal difference between the two lies in the type of shielding used. GMAW uses gas for shielding, thus we have Gas Metal Arc Welding. FCAW uses the melting or burning of the core ingredi- ents for shielding, and is thus termed Self-Shielded Flux Cored Arc Welding.

The recommended wire for Gas Metal Arc Welding (MIG) is Lincolnweld 0.025” (0.6 mm) L-56 electrode. Lincolnweld” L-56 is capable of welding a wide range of mild steels in all positions, however, more skill is required for out-of-position welding with the GMAW process.

PROCESS SELECTION

By gaining knowledge of the differences between the two processes, you will be able to select the best process for the job you have at hand. In selecting a process, you should consider:

For GMAW (MIG) Process

1.Is most of my welding performed on 16 gauge and lighter materials?

PRO 100

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Contents PRO California Proposition 65 Warnings SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéPlease Examine Carton and Equipment For Damage Immediately Thank YouTable of Contents Technical Specifications PRO InstallationRead entire installation section before starting Safety PrecautionsInstallation Identify and Locate ComponentsSelect Suitable Location Work Clamp InstallationOutput Connections StackingWork Cable Installation GUN InstallationConnecting Gun Cable to the PRO GAS Connection OptionalFigure A.5 Requirements For Rated Output Input ConnectionsCode Requirements for Input Connections Requirements For CSA Rated Output1OPERATIONB-1 Observe all safety information throughout this manualFumes and Gases can be dangerous Welding Sparks can cause fire or explosionOperation Wire Loading Welding OperationsSequence of Operation Wire Threading Friction Brake AdjustmentsCleaning Tip And Nozzle Process GuidelinesMaking a Weld Changing Machine Over to Feed Other Wire Sizes Welding with Gmaw MIGOverload Protection Learning to Weld Learning to WeldARC-WELDING Circuit SELF-SHIELDED Fcaw Welding ARCGmaw MIG Welding ARC Process SelectionFor Gmaw MIG Process Joint Types and Positions Common MetalsFor Fcaw Innershield Process Butt WeldsWelding In The Vertical Position PenetrationFillet Welds Welding Techniques for the SELF- Shielded Fcaw Process Machine SET UP for the SELF-SHIELDED Fcaw ProcessVertical-down Welding Correct Welding PositionCorrect Welding Speed Correct Electrical Stickout ESOPractice Helpful HintsWelding Techniques for the Gmaw MIG Process Machine SET UP for the Gmaw MIG ProcessFor the PRO 100, use the following To Eliminate a Ropy Convex Bead in order of importance Troubleshooting WeldsTo Correct Poor Penetration in order of impor- tance To Eliminate Stubbing* in order of importanceProper Gun Handling Application Chart Optional Accessories AccessoriesMIG Conversion K610-1 MIG Conversion Kit for the PROMaintenance Maintenance Safety PrecautionsRoutine Maintenance Configuration of Components in Wire Feeding System GUN and Cable MaintenanceFor Magnum 100L GUN Contact Tip Cable Liner Drive RollComponent Replacement Procedures Changing the Contact TIPChanging Drive Roll Liner trim length Changing LinerFigure D.3 GUN Handle PartsHOW to USE Troubleshooting Guide 1TROUBLESHOOTINGE-1Troubleshooting Guide TroubleshootingProblems Possible Areas Symptoms Misadjustments Recommended Course of ActionFeeding Problems Welding Problems PRO100 Wiring Diagram DiagramsPRO New Lessons in Arc Welding How To Read Shop DrawingsNeed Welding Training? $700.00Precaucion Warnung

PRO 100 specifications

The Lincoln Electric PRO 100 is a compact and versatile multi-process welder designed to meet the needs of both novice and experienced welders. Known for its robust build quality and advanced features, the PRO 100 is engineered for tasks ranging from light fabrication to heavy-duty welding projects.

One of the standout features of the PRO 100 is its multi-process capability. It can seamlessly switch between MIG, Stick, and TIG welding, allowing users to tackle various materials including aluminum, stainless steel, and mild steel with ease. This versatility makes it an essential tool for welding professionals and hobbyists alike, enhancing productivity and efficiency on the job.

The machine is equipped with Lincoln Electric's unique Auto-Set technology, which simplifies the setup process for users. By automatically adjusting the voltage and wire feed speed based on the selected material and thickness, it enables welders to achieve optimal results without extensive experience or technical knowledge. This feature not only saves time but also reduces the likelihood of mistakes, making it ideal for beginners.

Powering the PRO 100 is a reliable inverter-based technology that ensures smooth and consistent arcs. This technology not only enhances performance but also improves energy efficiency, making the machine more cost-effective in the long run. The compact design allows for portability, making it convenient for job sites where space may be limited.

The PRO 100 also boasts several safety features that protect both the user and the machine. It includes an overload protection system that prevents overheating, ensuring the longevity of the welder. Additionally, the welder features a rugged construction that can withstand demanding work environments, further enhancing its durability.

Furthermore, the PRO 100 is designed for user comfort and control. The intuitive interface and large color display provide clear readability of settings and parameters, allowing for quick adjustments. The adjustable wire feed speed and voltage settings give welders the flexibility to customize their welding experience.

In summary, the Lincoln Electric PRO 100 stands out in the crowd of welding machines for its multi-process capabilities, Auto-Set technology, and inverter-based power system. Its combination of portability, durability, and user-friendly features makes it an excellent choice for a wide range of welding applications, whether at home, in the workshop, or on the field. This well-rounded welder can help elevate the quality of the work for both the novice and the seasoned professional.
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