NA-3, NA-4 & NA-5
Improve productivity with the NA-3, NA-4, or NA-5 automatic
wire feeders. These systems have been specially designed
to deposit more weld metal at faster travel speeds which
eliminates bottlenecks and cuts costs.
Automatic Welding Systems
• Solid state controls allow for precise control of
welding procedures, striking characteristics, as
well as bead size and shape.
• Easily adjusted for a wide range of processes,
feed speeds, and wire sizes.
• Compact units with excellent flexibility to
fit into simple fixtures or the most complex
automated production lines.
• Rugged construction minimizes downtime
and maintenance costs.
• Three-year warranty on parts and labor.
The LT-7 Tractor is a self-propelled mechanized wire feeder, designed for the submerged
arc process with track system capabilities. It is self-guiding and easy to operate—only
one operator is usually required.
Submerged Arc DC Wire Feeder
Processes
• MIG
• Flux-Cored
• Submerged Arc
Output Input
Required Options
• Nozzle Assembly
• Control Cable
• Weld Power Cable
Key Options
•
More options at end of section
Literature
E9.10 (NA-3, NA-4)
E9.30 (NA-5)
Product Product Wire Feed Speed Range Wire Size Range - in. (mm)
Name Number ipm (m/min) Solid Cored
NA-3 K210-2 25-650 1/16-7/32 .035-5/32
(0.6-16.5) (1.6-5.6) (0.9-4.0)
NA-4 K388-2 subject to arc 1/16-7/32 –
voltage used (1.6-5.6) –
NA-5 K356-2 25-775 .035-7/32 .045-5/32
(0.6-16.5) (0.9-5.6) (1.2-4.0)
Product Product Input Output Capacity Wire Feed Speed Range Wire Size Range H x W x D Net Weight
Name Number Power Current/Duty Cycle ipm (m/min) Solid – in. (mm) in. (mm) lbs. (kg)
LT-7 K227-1 115 VAC 600A/100% 100 - 400 3/32 - 3/16 27.5 x 33 x 14 120
Standard 50/60 Hz 1100A/100% (with (2.5 - 10.2) (2.4 - 4.8) (698 x 838 x 356) (54)
water cooling)
LT-7 K395-1 130
Track Model (59)
115
VAC
• Feeds 3/32"-3/16" (2.4-4.8 mm) solid wires, from 100-400
inches per minute (2.5-10.2 m/min) wire feed speed.
• Calibrated tractor drive adjusts travel speeds from
6"-70" per minute (0.12-1.8 m/min).
• Vertical head lift adjuster for adjusting electrical
stick-out from 1/2"-5" (12.7-127.0 mm).
• Weld angle is up to 50° from vertical on either side;
drag angle is up to 30° from vertical.
• Control box can be mounted either left or right,
eliminating the need to return to the power source
for routine procedure changes.
• Welds butts, horizontal fillet and lap joints to the
left or right side of the tractor frame for convenience.
• Three-year warranty on parts and labor.
Track Model shown
115
VAC
Processes
• Submerged Arc
Output Input
Unit Includes
• Control Cable, 25 ft. (7.6 m)
Required Options
• Nozzle Assembly
• Control Cable
• Weld Power Cable
Key Options
•
More options at end of section
Literature
E9.70
LT-7 Tractor
www.lincolnelectric.com/wire-feeders
Automatic Wire Feeders
78
Shown: NA-5N
