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LF-72/74
OPERATION
B-3 B-3
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COMMON WELDING ABBREVIATIONS
WFS
• Wire Feed Speed
CV
• Constant Voltage
GMAW (MIG)
• Gas Metal Arc Welding
FCAW (Cable Innershield or Outershield)
• Flux Core Arc Welding
PRODUCT DESCRIPTION
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.
RECOMMENDED PROCESSES
• GMAW .023-1/16 (0.6 - 1.6 mm) steel electrodes.
• FCAW .035 -5/64 (0.9 - 2.0mm) cored electrodes
PROCESS LIMITATIONS
• 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
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.