B-6

OPERATION

B-6

 

 

 

•In 4-Step position allows welding without continu- ously holding the start switch trigger. The arc start switch functions in the following manner:

1.Closing switch starts preflow, then arc starts at Minimum (Start) setting level (See Item 7). If the trigger is maintained closed after preflow time the output remains at the Start level until it is released.

2.Opening switch initiates fixed (0.5 sec.) ramp time from Start setting level to Weld setting.

3.Reclosing switch initiates Downslope ramp time setting (See item 17) from Weld setting down to the Crater-fill level (See Item 7) of the machine.

4.Reopening switch after Downslope time holds Crater-fill level until switch opens, then stops the arc and initiates the Postflow Time (See Item 9). Or, reopening switch during Downslope time immediately stops the arc and initiates the Postflow.

Note: See Section B-7 for 4-Step operation during Downslope with Restart feature selected to be enabled, instead of disabled (as shipped).

13.PULSE MODE SWITCH – Turns on the Pulse Mode as indicated by the Green panel light turning on.

•Pulsing provides a Peak current level set by REMOTE and/or LOCAL control of the output cur- rent (See Item5), for a time determined by the Pulse Frequency Control setting (See Item 14) and the % ON Time (See Item 15). The balance of the cycle time is at the Background Current level (See Item 16).

•Pulsing begins after upslope when the output cur- rent rises above the Background Current level and ends when the output current drops below this level.

14.PULSE FREQUENCY CONTROL – This knob is used to set the Pulse Frequency over the peak pulse range of about 0.1 pps to 20 pps. (One pulse cycle time = 1/pps = 10 to .05 sec. range.)

15.PULSE % ON TIME CONTROL – This knob con- trols the duration of the peak current as a percentage (5% to 95%) of one pulse cycle. The balance of the cycle time will be at the Background Current setting. (See Item 16)

16.PULSE BACKGROUND CURRENT CONTROL – This knob controls the level of the Background Current as a percentage (MIN.-100%) of the Peak (REMOTE and/or LOCAL) output level (See Item 6) down to the Minimum Output setting (See Item 7).

17.DOWNSLOPE TIME– This knob is used to set the time, over the range of zero to about 10 seconds, to ramp down from weld setting to Crater-fill level (See Item 7).

•If the arc goes out after the Downslope time is initi- ated, the Downslope time is interrupted and the Postflow time is initiated. This prevents Hi-Freq re- initiation during ramp down crater fill

•When using an Amptrol remote control, where the downslope is controlled by the operator down to the crater-fill level, the Downslope time should be set to zero so as not to have the Downslope time delay when the arc start switch is opened.

PRECISION TIG 275

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Lincoln Electric IM702-A manual Operation
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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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