Lincoln Electric LN-742, LN-742H User Manual
LN-742 and LN-742H
Semiautomatic Constant Speed Wire Feeders
2
LN-742 and LN-742H
• LN-742 model feeds up to 1/16”
(1.6mm) solid and 3/32” (2.4mm)
flux-cored wires, from 50-770 inches per minute (1.27-19.5 m/min)
wire feed speed.
• LN-742H high speed model feeds
up to .045” (1.2mm) solid or fluxcored wires, from 80-1200 inches
per minute (2.03-30.5 m/min) wire
feed speed.
• 2 or 4 roll wire drive system for
positive wire feeding.
• Unique variable wire run-in speed
and acceleration provide controlled
arc starting. Matches starting performance to power source starting
dynamics, wire type, welding procedures, and operator technique.
• Dynamic braking system stops wire
feed motor quickly to minimize
crater sticking problems.
• Solid state control compensates for
wire drag and input line variations to
maintain accurate wire feed speed.
• Tool-less quick release wire drive
tension system and gun cable
connections for easy wire or gun
changes.
• Presettable wire feed speed, run-in
speed, and cold inch speed.
• Trigger mode selection for standard
2-step, interlocking 4-step and
timed spot welding.
• Gas solenoid and timer controls for
preflow and postflow gas, burnback
and spot times.
• Cold inch and gas purge control.
• Digital voltmeter with auto-polarity
and memory feature to display and
recall the last arc voltage reading.
• Optional remote voltage control kit
provides procedure control at
LN-742.
• Optional wire feeder remote control
kit provides remote voltage and wire
feed speed control up to 16 ft. (5m)
from wire feeder. Ideal for boom
mounted feeders and where the
operator wants control at the arc.
• 3 year warranty on parts and labor.
• Manufactured under a quality
system certified to ISO 9002
requirements.
The LN-742 is a semiautomatic constant speed wire feeder for MIG and
flux-cored arc welding. Powered by a
new 42 volt motor drive system, the
LN-742 is available in standard or high
speed models, with either a 2 or 4 roll
wire drive system.
Designed for welding procedure flexibility and simplicity, the LN-742’s
keypad panel provides finger touch
control for welding procedure parameters. In addition, a unique arc starting
control system allows you to set run-in
wire feed speed and acceleration for
smooth, clean arc starts. This feature
is ideal for critical arc starting on mild
and low alloy steels, stainless steels,
aluminum, and alloy materials where
starting precision is a must.
The LN-742’s digital meter can be set
for English or metric display, allowing
ADVANTAGE
LINCOLN
either inches per minute or meters per
minute procedure setting. This makes
the unit ideal for multinational corporations and contractors who require
procedure flexibility.
3
Wire Speed Wire Size Range
Product Ordering Range in. (mm) Weight Dimensions
Name Information IPM (m/min)
Solid Cored
Input (net) HxWxD
LN-742 K617-1 50-770 .025-1/16” .045-3/32”
2 roll (1.27-19.5) (0.6-1.6) (1.2-2.4) 24 lbs. 10.9 x 9.8 x 9.6 in.
42 VAC (10.9 kg) (277 x 249 x 244mm)
LN-742H K617-2 80-1200 .025-.045” .025-.045”
2 roll (2.03-30.5) (0.6-1.2) (0.6-1.2) 50/60 Hz
LN-742 K618-1 50-770 .025-1/16” .045-3/32” 4 Amps
4 roll (1.27-19.5) (0.6-1.6) (1.2-2.4) 28.7 lbs. 11.1 x 11.6 x 9.7 in.
(13.0 kg) (282 x 295 x 246mm)
LN-742H K618-2 80-1200 .025-.045” .025-.045”
4 roll (2.03-30.5) (0.6-1.2) (0.6-1.2)
Cold Inch Control
Gas Purge Control
Wire feed speed and inch
speed controls
Keys used to increase or
decrease wire feed speed
and inch speed
Trigger Mode Control
Preflow, Postflow, Burnback
and Spot Time Controls
Large digital display for easy
viewing of adjustable welding
parameters
A CLOSER LOOK
TECHNICAL
SPECIFICATIONS
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