Lincoln LN-742H manual Power Input Cables, Welding Guns

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ACCESSORIES

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K320 FLUX TANK

Either turn off the incoming air line or remove the quick disconnect if one has been installed. Slightly loosen the tank cap and let the air in the tank escape in the holes in the side of the cap. After pressure has been released, remove the cap from the tank. Using the funnel provided, put 100 pounds of flux in the tank. It is very important that only new or properly reclaimed flux be put in the tank. Coarse particles and/or magnetic particles will stop the flux feeding process. New Lincoln flux is properly screened at the factory. All reclaimed flux must be separately screened through a vibrating screen with 0.065 in. to 0.075 in. openings and be put through a magnetic separator. The K310 vibrated screen and K58 magnetic separator are available for this purpose. The screen in the funnel supplied with the tank has much larger openings and its only purpose is to keep paper and slag out of the tank.

There will always be a small amount of air and possible drops of water coming out of the end of the tube coiled under the tank. This is an automatic disposal system in case the plant air has water and dirt in it.

POWER INPUT CABLES

A variety of power input cable assemblies are avail- able for various current ratings and power source con- nection types. All provide a polarized control cable plug and a lugged electrode cable for connection to the wire feeder.

WELDING GUNS

Welding guns can be broken down into groups, according to the type of welding that is to be accomplished. Select the appropriate welding gun from the following weld-type groups.

INNERSHIELD GUNS

K122. This submerged arc gun and its cable assem- blies are rated 500 amps, 60% duty cycle.

K115. This Innershield gun and its cable assemblies are rated at 450 amps, 60% duty cycle. Maximum wire size for LN-742 models is 5/64 in. (2.0 mm).

K126. This Innershield gun and its cable assemblies are rated at 350 amps, 60% duty cycle. Maximum wire size for LN-742 models is 5/64 in. (2.0 mm).

NOTE: The K115 and K126 are not recommended for LN-742H models.

NOTE: LinconditionerTM guns are recommended for locations where smoke accumulation is a problem and conventional exhaust systems are ineffective. The available smoke removal type Innershield guns and vacuum units can be used in these locations. Instructions are shipped with the equipment.

K1819-[ ] CONTROL CABLES

These control cables connect the wire feeder to the power source.The wire feeder end is an 8 pin anphe- nol and the power source end is a 14 pin amphenol. The control cable supplies 42VAC from the welding power source to the feeder. It also carries a lead for the work voltage and sends signals for the gun trigger and remote voltage potentiometer. See connection diagram of wire feeder to power source in the “Installation Section”.

K1817-[ ] CONTROL CABLE EXTENSIONS

The control cable extensions are used to lengthen the control cable. The extensions have a 14 pin amphenol on one end that connects to the K1819-[ ] cable and the other end has a 14 pin amphenol that connects to the welding power source. Do not exceed more than

100Ft. (31m) of total control length. See connec- tion diagram of wire feeder to power source in the “Installation Section”.

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 Work Cable Table A.1 Work Lead SpecificationsGUN and Cable Assemblies GUN Cable ConnectionsFigure A.5 Water Connections Water Connections For Water Cooled GunsFigure A.6 Shielding GAS Hookup Gmaw Shielding GAS HookupOperation Safety PrecautionsOperating Instructions General DescriptionFigure B.1 Wire Feeder Controls Controls and SettingsDrive Roll Installation Acceleration SettingChanging Drive Rolls for TWO- Roll Wire Feeders English or Metric Speed Display UnitsGuide 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 ChangingGeneral AccessoriesTable C.1 LN-742 Accessories K163 Undercarriage K589-1 Remote Control KITK178-1 Mounting Platform Solenoid KITWelding Guns Power Input CablesSPINDLES, STANDS, Adapters Attaching the Wire Reel Stand Table C.2 Drive Roll KIT Numbers Drive Roll KitsPeriodic Maintenance MaintenanceRoutine 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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