Lincoln LN-742 manual Operation, Operating Instructions, Safety Precautions, General Description

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OPERATION

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OPERATING INSTRUCTIONS

Read and understand the entire Operation Section prior to operating the machine.

SAFETY PRECAUTIONS

WARNING

ELECTRIC SHOCK can kill.

•Do not touch electrically live parts or electrode with skin or wet clothing.

•Insulate yourself from work or ground.

•Always wear dry insulating gloves.

FUMES AND GASES can be dangerous.

• Keep your head out of fumes.

• Use ventilation or exhaust to remove fumes from breathing zone.

WELDING SPARKS

can cause fire or explosion.

•Keep flammable material away.

•Do not weld on containers that have held combustibles.

ARC RAYS can burn.

• Wear eye, ear, and body protection.

Observe additional Safety Guidelines detailed in the beginning of this manual.

GENERAL DESCRIPTION

The K617 LN-742 semiautomatic constant speed wire feeder is specifically equipped for gas metal arc welding using flux-cored Outershield electrodes and solid wire. The LN-742 is also suitable for self-shielded flux-cored Innershield electrodes, submerged arc welding (if constant voltage is satisfactory), and other open arc welding. It has been factory assembled with the following features:

•Wire feed control [50 to 770 in./min (1.25 to 19.5 m/min) for the LN-742; 80 to 1200 in./min (2.00 to 30.5 m/min) for the LN-742H].

•Factory installed gas solenoid valve and gas fittings.

•Wire drive uses a permanent magnet motor and includes tool-less “quick-release” idle roll pressure arm, outgoing guide tube and gun cable fastening.

•Optional factory installed water solenoid and fittings for use with water cooled welding guns.

The LN-742 4-Roll is designed to provide the additional feeding force required when using gun cables over 15 ft (4.6 m) long or when the wire is pulled long distances (such as when bulk packages are used). Because the four-roll feeder has twice the contact surface, it can also help when feeding softer wires by delivering the same or more feeding force as the two-roll with less overall wire deformation.

RECOMMENDED PROCESSES AND EQUIPMENT

The LN-742 is recommended for use in MIG and Innershield welding applications with constant voltage power sources with 42 VAC auxiliary power and a 14- pin connector receptacle, such as the Invertec V300- PRO, V350-PRO, DC-400, DC-600, DC-655 DC-650- PRO, or Lincoln CV type power sources.

The LN-742 is capable of the following wire feed ranges:

•0.025 to 1/16 in. (0.6 to 1.6 mm) solid wire for gas- metal-arc or CV submerged arc processes.

•0.045 to 3/32 in. (1.2 to 2.4 mm) cored wire for Outershield gas-metal-arc processes.

LN-742 & LN-742H

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Contents LN-742 & LN-742H Wire Feeders California Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéThank You Table of Contents Technical Specifications LN-742 InstallationInput Cable Connections Mounting LocationFigure A.2 Strain Relief Clamp PIN GUN Cable Connections Table A.1 Work Lead SpecificationsWork Cable GUN and Cable AssembliesFigure A.5 Water Connections Water Connections For Water Cooled GunsFigure A.6 Shielding GAS Hookup Gmaw Shielding GAS HookupGeneral Description Safety PrecautionsOperation Operating InstructionsFigure B.1 Wire Feeder Controls Controls and SettingsEnglish or Metric Speed Display Units Acceleration SettingDrive Roll Installation Changing Drive Rolls for TWO- Roll Wire FeedersGuide Tube Detail Changing Drive Rolls for FOUR- Roll Wire Feeders Figure B.3 Installing Drive Rolls on a FOUR-ROLL Feeder Figure B.4 Idle Roll Pressure Setting Idle Roll Pressure SettingFigure B.5a Threaded Locking Collar Wire LoadingInnershield Coils Electrode Feeding and Brake AdjustmentTo Mount a 50 or 60 LB Coil Adjustable Wire Reel BrakeFigure B.7 K1504-1 Coil Reel READI-REELS a K438 READI-REEL Adapter Must be UsedMaking a Weld Wire Reel ChangingAccessories Table C.1 LN-742 AccessoriesGeneral Solenoid KIT K589-1 Remote Control KITK163 Undercarriage K178-1 Mounting PlatformWelding Guns Power Input CablesSPINDLES, STANDS, Adapters Attaching the Wire Reel Stand Table C.2 Drive Roll KIT Numbers Drive Roll KitsMaintenance Routine MaintenancePeriodic Maintenance HOW to USE Troubleshooting Guide TroubleshootingTroubleshooting Troubleshooting Troubleshooting Troubleshooting Troubleshooting Troubleshooting Diagrams LN-742 & LN-742H LN-742 & LN-742H LN-742 & LN-742H LN-742 & LN-742H Precaucion Warnung

LN-742, LN-742H specifications

The Lincoln LN-742H and LN-742 are renowned models in the realm of industrial welding equipment, specifically designed to cater to the needs of professional welders and fabricators. These machines stand out for their robustness, advanced technology, and ease of use, making them popular choices in various industries, including construction, automotive, and manufacturing.

One of the main features of the Lincoln LN-742H and LN-742 is their powerful Arc control capabilities. The machines are equipped with innovative technology that allows for consistent arc stability, which is crucial for achieving high-quality welds. The adjustable arc force enables users to tailor the welding parameters to their specific applications, facilitating optimal penetration and minimal spatter.

The LN-742H model is particularly notable for its enhanced portable design, making it easier for operators to transport the machine to different job sites. This portability does not compromise its power, as it offers a high output suitable for both thin and thicker materials. Moreover, the LN-742 model comes with a highly efficient cooling system that ensures the machine runs smoothly without overheating, even during prolonged use.

Both models feature an intuitive user interface that simplifies the welding process. The digital display offers real-time feedback on the welding parameters, allowing welders to make precise adjustments as needed. This feature is especially beneficial for beginners, who may be unfamiliar with optimal welding settings.

Another impressive characteristic of the Lincoln LN-742H and LN-742 machines is their versatility. They support various welding processes, including MIG, TIG, and stick welding, giving users the flexibility to choose the most suitable method for their projects. This adaptability makes these models an ideal solution for shops that handle a wide range of welding tasks.

Durability is a significant consideration in the design of the LN-742H and LN-742, as they are built with high-quality materials that withstand heavy use and challenging conditions. The rugged construction extends the lifespan of the machines, reducing the need for frequent repairs and servicing.

In summary, the Lincoln LN-742H and LN-742 welding machines exemplify advanced engineering and user-focused design. Their combination of powerful performance, portability, user-friendly features, and versatile applications makes them essential tools for professionals in the welding industry, paving the way for excellence in metal fabrication and repair.
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