Lincoln Electric IM702-A manual Operation

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B-4

OPERATION

B-4

 

 

 

•When the Polarity Switch is set to DC (- or +), the TIG mode provides high frequency only for starting.

Hi-Freq. turns on after pre-flow time with the arc start switch closure, and turns off when the arc is established*

•Also functions for DC+ polarity to permit "balling" of tungsten for AC TIG welding.

4.AC BALANCE CONTROL – The potentiometer control permits AC wave balance adjustment from Max. Penetration (~85% negative wave) with the control at Max. full CW position, to Max. Cleaning (~65% positive wave) with the control set near min- imum CCW position.

•Full minimum CCW position is the Auto Balance position which is indicated by the Green panel light turning on. This feature automatically provides the proper amount of cleaning and penetration for nor- mal AC TIG welding

•The mid position is the Balanced position (~50% positive and negative waves).

•The Balance control is only functional if the machine is set to AC polarity and TIG mode.

5.LOCAL/REMOTE CURRENT CONTROL SWITCH – A 2-position switch selects how the welding output is controlled for both Stick and TIG Modes:

•LOCAL (Top position) selects output control only by the machine panel Output Control. (See Item 6)

•REMOTE (Bottom position) selects output control to also be by an Amptrol (See Item 6), or other remote (10K pot) control connected to the Remote recepta- cle (See Item 11) This switch selection is indicted by the Green panel light turning on.

In either position the arc start switch functions when connected to the Remote receptacle (See Item 11).

6.MAXIMUM OUTPUT CONTROL – The large knob is used to set the output welding current over the rated output range of the machine.

•With the Current Control switch to LOCAL position, this knob sets the welding output level.

•With the Current Control switch to REMOTE posi- tion, this knob sets the maximum welding level that the Peak output can be set with the remote Amptrol.

•The new MicroStartTM Technology minimum current circuit provides for low end welding (down to 2 amps) previously unobtainable on an SCR platform TIG machine.

7.MINIMUM OUTPUT CONTROL AND DISPLAY SWITCH– A smaller knob is used to preset the minimum cur- rent level only for TIG mode. Pressing the Display (momentary) switch toggle left to Minimum Set posi- tion displays the Minimum control level setting on the Digital meter. (See Item 8)

•This knob sets the Start output level. When the arc lights (using a new built-in TIG start pulse) this level upslopes quickly (0.5 sec.w/ Advanced Panel, zero w/o) and smoothly to the weld output level. The set- ting range for this Start control is the 2 amp mini- mum range of the machine up to about 50 amps, but no more than the level set by the Maximum Output control knob (See Item 6), but otherwise is indepen- dent of the Maximum setting.

•This setting also serves as the Crater-fill level, but with a Precision TIG Advanced Panel it can be selected (see Section B-7) to be either the Minimum Output control setting (same as Start setting) as shipped, or the minimum rating of the machine (2 amps).

•The Remote Amptrol range of control is between this Minimum setting and the Maximum Output con- trol knob setting, so these knobs can set the resolu- tion of the Amptrol. Also, the Minimum setting serves as both the minimum Amptrol start level when the arc start switch is closed, as well as the minimum Amptrol crater-fill level before the arc start switch is opened to help prevent premature arc out and Hi-Freq re-initiation.

.

•In STICK mode the Start control is not functional since Hot Start level is fixed, or internal Advanced Panel adjustable (see Section B-7). Pressing the Display (momentary) switch toggle left to Minimum Output position displays minimum amps rating of the machine.

PRECISION TIG 275

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Contents Precision TIG 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 Rated Input Single Phase only InstallationPrecision TIG Additional Output Capacity Recommended Input Wire and Fuse SizesPhysical Dimensions Temperature RangesSafety Precautions Input and Grounding Connections Stick Electrode Cable Connection Work Cable ConnectionOutput CABLES, Connections and Limitations Figure A.2 TIG Torch ConnectionFigure A.3 Auxiliary Power ConnectionsFigure A.4 Robotic Interface ConnectionWelding Sparks OperationProduct Description Pipe ThawingEquipment Limitations Recommended Processes and EquipmentRecommended Processes Process LimitationsFigure B.1 Control Panel Controls and SettingsOperation Advanced Panel Controls Do not USE 4-STEP if Using AN Amptrol RemoteOperation Stick Welding Features Internal SET UP ControlsTIG Welding Features Figure B.3 Figure B.4 Setup Guidelines for TIG Welding with AN Amptrol TIG Weld Cycle ChartUsing the Start Pedal Foot Amptrol K870-1 Figure B.5 Recommended Electrode Amperage Ranges Precision TIG Making a TIG Weld with AN AmptrolOptional Equipment AccessoriesFactory Installed Options Field Installed OptionsOverload Protection MaintenanceSafety Precautions Routine and Periodic MaintenanceUNDER-COOLER Service Service ProceduresComponent Access Spark GAP AdjustmentHOW to USE Troubleshooting Guide TroubleshootingOutput Problems SymptomsCourse of Action GAS Problems Meter ProblemsHI-FREQ Problems Preset & Output Control Problems TIG Welding Problems Stick Welding ProblemsTIG Problems Precision TIG 275 Wiring Diagram for Code SCR3 Enhanced Diagrams Dimension Print K1826-1 DOMESTIC, K1826-2 Canada and K1827-1 Export Precision TIG Warnung Aviso DE

IM702-A specifications

The Lincoln Electric IM702-A is a versatile and innovative welding machine that has garnered attention for its advanced features and robust performance. Designed for various welding applications, the IM702-A is a go-to choice for professionals in the industry, offering precision, reliability, and ease of use.

One of the standout characteristics of the IM702-A is its advanced inverter technology. This allows for a lightweight and compact design, making it easier to maneuver in tight spaces compared to traditional welding machines. The inverter technology also contributes to energy efficiency, reducing power consumption without compromising on performance.

The IM702-A features a multi-process capability, enabling it to perform MIG, TIG, and Stick welding with ease. This versatility makes it ideal for a wide range of projects, from industrial manufacturing to home repairs. Users can seamlessly switch between different welding processes, enhancing productivity and streamlining workflow.

In terms of user interface, the Lincoln Electric IM702-A is designed with convenience in mind. It boasts a digital display that provides real-time information on welding parameters, making it easier for operators to monitor and adjust settings as needed. The intuitive controls are user-friendly, allowing even novice welders to achieve professional-quality results.

The machine also includes advanced weld control features, such as precise amperage and voltage adjustments. These controls ensure that users can achieve optimal settings for different materials and thicknesses, resulting in clean, strong welds. Additionally, the IM702-A is equipped with an automatic voltage adjustment feature, which helps maintain consistent performance under varying input conditions.

Durability is another key selling point for the IM702-A. Built with high-quality materials and engineering, this welding machine is designed to withstand the rigors of daily use in demanding environments. Its rugged construction provides reliability and longevity, ensuring that it remains a valuable asset in any workshop.

Lastly, safety is a priority in the design of the IM702-A. It includes several built-in safety features, such as thermal overload protection and a stabilized arc performance that reduces the risk of arc blow, protecting both the operator and the equipment.

Overall, the Lincoln Electric IM702-A stands out in the welding market due to its advanced technologies, multi-process capabilities, user-friendly interface, and robust safety features, making it an excellent choice for professional welders seeking high-quality performance and versatility.
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