B-2
OPERATION
B-2
LF-72
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 pe rform ance mo tor gea rbox. A hea vy duty
hinged door opens easily, which provides an ample
amount of room for assembling precision drive com-
ponents 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 calibrated WFS knob, cold-feed/ gas purge switch
and trigger interlock.
• Several kits are available to expand the LF-72’s
welding capability. The timer kit allows adjustment of
burnback and postflow times. The remote voltage
control kit includes a 0 to 10 dial for setting the weld-
ing voltage 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, -5 Bench model, std. duty: Maximum
spool size = 44 lb. (20 kg); 12 inch (300mm) diame-
ter; 4 inch (100mm)
• For K2327-3, -6, -7 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.