Common Welding Abbreviations

B-3	OPERATION	B-3

	PROCESS LIMITATIONS

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WFS

• Wire Feed Speed

•Constant Voltage

GMAW (MIG)

• Gas Metal Arc Welding

FCAW (Cable Innershield or Outershield)

•Flux Core Arc Welding

PRODUCT DESCRIPTION

•Rated for up to 1/16(1.6 mm) solid electrode and 5/64 (2.0 mm) cored electrode.

•The maximum WFS is 800 in/min (20.3 M/min).

•The LF-72 is not recommended for GMAW-Pulse (synergic), GTAW, GTAW-Pulse, SAW, CAG, SMAW.

•Do not use push-pull equipment with the LF-72.

•For K2327-2 Bench model, std. duty: Maximum spool size = 44 lb. (20 kg); 12 inch (300mm) diame- ter; 4 inch (100mm)

•For K2327-3 Bench model, heavy duty: Maximum spool size = 60 lb. (27.2 kg)

REQUIRED EQUIPMENT

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General Physical Description

The LF-72 is optimized for .035 through .045 (0.9mm through 1.2mm) GMAW welding. The powerful 2 roll drive, heavy duty enclosure and wire reel stand com- bine to make an easy to install, easy to use wire feed- er for everyday welding. Powering the wire drive is a high performance motor gearbox. A heavy duty hinged door opens easily, which provides an ample amount of room for assembling precision drive components and the welding gun. Also under the door is a convenient storage tray for contact tips and tools.

Three packages are available. The basic unit consists of the wire drive box housing. The standard duty bench model targets users of 12" (305 mm)diameter spools. The heavy duty bench model satisfies the needs of customers using 60 lb (27.2 kg) spools.

General Functional Description

•The LF-72 is a highly versatile and economical choice of industrial feeders. Easy to use features are a cali- brated WFS knob, cold-feed/ gas purge switch and trigger interlock.

•Several kits are available to expand the LF-72’s weld- ing capability. The timer kit allows adjustment of burn- back and postflow times. The remote voltage control kit includes a 0 to 10 dial for setting the welding volt- age at the wire feeder. The swivel kit mounts to the lift bail of a power source and lets the feeder freely rotate so the gun cable stays straight.

Lincoln’s LF-72 is designed for use with the CV and DC family of power sources. These include:

• CV-305	• DC-400
• CV-400	• DC-600

•CV-655 • Invertec™ V350

•Invertec™ V450

EQUIPMENT LIMITATIONS

•Maximum gun length =25 ft. (7.6m)

•Maximum conduit length = 30 ft. (9.1m)

•Maximum total control cable length = 100ft (31m)

•The LF-72 operates on 42VAC and not 115 VAC

•The K1733-1 wire straightener may not be used with the LF-72

•Gun bushings are required for welding guns that do not have a Magnum (Tweco #2-#4 compatible) back end.

•The LF-72 does not attach to K303 wire reel stands.

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RECOMMENDED PROCESSES

•GMAW .023-1/16 (0.6 - 1.6 mm) steel electrodes.

•FCAW .035 -5/64 (0.9 - 2.0mm) cored electrodes

Lincoln Electric LF-72/74 service manual Common Welding Abbreviations, Product Description

Models: LF-72/74

OPERATION