Lincoln LN-742H manual Making a Weld, Wire Reel Changing

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B-12

OPERATION

B-12

 

 

 

MAKING A WELD

1.Use only constant voltage power type sources. If using a multiple process power source, be sure it is set for constant voltage output per instructions in the manual for the power source.

2.Set the power source polarity switch or properly connect the electrodes and work leads for the correct electrode polarity.

3.Set the voltage using the control on the power source or, if used, the optional K589-1 Remote Kit or K857 Remote Voltage Control. Set the open circuit voltage to approximately 2 volts higher than the desired procedure voltage. The final setting must be made according to the arc voltage while welding.

4.Use the Mode Selection key to set the desired operating mode.

5.Use the Function Selection key and Selection Setting arrow keys to set the desired Inch and Weld Feed speeds.

6.Use the Time Selection key and Selection Setting arrow keys to set the desired timers.

7.Inch the electrode through the gun and cable. For solid wire, cut the electrode within approximately 3/8 in. of the end of the contact tip. If using cored wire, cut the electrode within 3/4 in. of the extension guide.

8.Connect the work cable to the metal to be welded. The work cable must make good electrical contact with the work. The work must also be grounded.

WARNING

When using an open arc process, it is necessary to use correct eye, head, and body protection.

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9.Position the electrode over the joint. The end of the electrode may be lightly touching the work.

10.Lower your welding helmet. Close the gun trigger and begin welding. Hold the gun so the contact tip to work distance gives the correct electrical stickout as required for the procedure being used.

11.To stop welding, release the gun trigger and then pull the gun away from the work after the arc goes out.

WIRE REEL CHANGING

At the end of a coil, remove the last of the old electrode from the conductor cable. Either pull it out at the nozzle, or use the following procedure:

1.Cut off the end of the electrode at the gun end. Do not break it off by hand. Breaking by hand puts a slight bend in the wire, making it difficult to pull it back through the nozzle.

2.Uncouple the gun conductor cable from the conductor block on the wire feeder drive unit and lay the gun cable out straight.

3.Using pliers, grip the wire and pull it out of the cable from the connector end.

4.After the electrode has been removed, connect the gun conductor back to the wire feeder.

5.Load a new reel of electrode per the instructions for the specific reel type given previously in this section.

LN-742 & LN-742H

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Contents LN-742 & LN-742H Wire Feeders Safety California Proposition 65 WarningsElectric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Sûreté Pour Soudage a L’ArcThank You Table of Contents Installation Technical Specifications LN-742Mounting Location Input Cable ConnectionsFigure A.2 Strain Relief Clamp PIN GUN and Cable Assemblies Table A.1 Work Lead SpecificationsWork Cable GUN Cable ConnectionsWater Connections For Water Cooled Guns Figure A.5 Water ConnectionsGmaw Shielding GAS Hookup Figure A.6 Shielding GAS HookupOperating Instructions Safety PrecautionsOperation General DescriptionControls and Settings Figure B.1 Wire Feeder ControlsChanging Drive Rolls for TWO- Roll Wire Feeders Acceleration SettingDrive Roll Installation 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 Idle Roll Pressure Setting Figure B.4 Idle Roll Pressure SettingWire Loading Figure B.5a Threaded Locking CollarElectrode Feeding and Brake Adjustment Innershield CoilsAdjustable Wire Reel Brake To Mount a 50 or 60 LB CoilREADI-REELS a K438 READI-REEL Adapter Must be Used Figure B.7 K1504-1 Coil ReelWire Reel Changing Making a WeldGeneral AccessoriesTable C.1 LN-742 Accessories K178-1 Mounting Platform K589-1 Remote Control KITK163 Undercarriage Solenoid KITPower Input Cables Welding GunsSPINDLES, STANDS, Adapters Attaching the Wire Reel Stand Drive Roll Kits Table C.2 Drive Roll KIT NumbersPeriodic Maintenance MaintenanceRoutine Maintenance Troubleshooting HOW to USE Troubleshooting GuideTroubleshooting 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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