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Description
Output Input
Submerged Arc
LT-7 Tractor
Submerged Arc DC Wire Feeder
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. It is designed to be
used with a variety of Lincoln DC constant voltage and constant current power
sources. The rugged, lightweight unit permits quick movement to the next joint.
Its compact size fits through small openings and confined spaces. Butt and
fillet welds can be made on heavy plate or steel as light as 12 gauge (2.5mm).
The LT-7 Tractor is ideal for the following applications: ship and barge building,
storage tank erection, bridge deck installation, beam, girder or column
fabrication, and long seams on heavy weldments.
Publication E9.70 12/03
www.lincolnelectric.com
Processes
Advantage Lincoln
Order
TECHNICAL SPECIFICATIONS
Recommended General Options
• LT-7 Tractor feeds 3/32 to 3/16” (2.4 to 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 to 70
inches per minute (0.12 to 1.8 m/min).
• Vertical head lift adjuster for adjusting electrical stickout from
1/2 in. to 5 in. (12.7 to 127.0 mm).
• Weld angle is up to 50° from vertical on either side; drag
angle is up to 30° from vertical.
• Control box is conveniently located on the tractor (can be
mounted either left or right), eliminating the need to return to
the power source for routine procedure changes.
• Exceptional tracking control and self-steering in most
applications leave the operator free for quality control, joint
cleaning and flux handling.
• Welds butts, horizontal fillet and lap joints to the left or right
side of the tractor frame for convenience.
• Close mechanical alignment between wire and joint maximizes
weld quality with no fixturing costs.
• Three-year warranty on parts and labor.
Recommended Power Sources
AUTOMATIC WIRE FEEDERS
11 5
VAC
K227-1 LT-7 Standard Model
K395-1 LT-7 Track Model
Wire Feeder Control Cable Extensions, Adapter Cable, Linc-Fill™
Attachments, Horizontal Fillet and Lap Adapter Kit, Flat Fillet Adapter
Kit, Butt Seam Guide Kit, Track Conversion Kit, Tiny Twinarc
®
Adapter Kit, Track Section, Flux Screen, Magnetic Flux Screen
Separator, Concentric Flux Cone Assembly
Required Options
Control Cable, Weld Power Cable, Contact Nozzle Assembly
CV-655, DC-600, DC-655, DC-1000, DC-1500
Wire Feed Wire Size Range Dimensions Net
Product Product Input Rated Output Speed Range Solid H x W x D Weight
Name Number Power Current/Duty Cycle ipm (m/min) 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)
LT-7 K395-1
water cooling)
130
Track (59)
Track Model Shown
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LT-7 Tractor
www.lincolnelectric.com
[2]
A CLOSER LOOK
REQUIRED OPTIONS
PERFORMANCE
• Solid-state control system precisely regulates procedures for
reliable starting and economical welding.
• Automatic compensation for input voltage and tractor loading
variations.
• Function lights built into the solid-state printed circuit boards aid
troubleshooting to minimize down time.
• Cross seam adjuster speeds setup and lets operator track
irregular joints while welding. Adjustment range is 3-1/8 in.
(79 mm) with clamp and 2-1/2 in. (63 mm) with handwheel.
• To perform a curved weld, the minimum diameter can be as small
as 10 ft. (3.0m) for an inside weld and 13 ft. (3.9m) for an outside
weld.
• To perform an inside circumferential weld, the minimum inside
diameter that can be welded is approximately 5 ft. (1.5m).
QUALITY AND RELIABILITY
• Three-year warranty on parts and labor.
• Manufactured under a quality system certified to ISO 9001
requirements.
• Rugged and durable design recognized throughout the industry
for its long life and years of trouble-free wire feeding.
FEATURES
• Quick, easy installation of optional guides for different joints.
• Reel holds 60 lb. (27.2 kg) solid wire coils.
• Flux hopper capacity of 15 lbs. (6.8 kg). Includes a manual flux
flow rate control valve and can be mounted at four locations to
the left or right.
• Continuous Vertical Adjustment: 1-1/2” (38 mm) handweel
variation for ESO (electrical stickout).
• Travel clutch operates from either side of the tractor.
456
WELD POWER CABLES
CONTROL CABLES
Description Order No.
Wire Feeder Control Cable K1822-25 - 25 ft. (7.6m)
Wire Feeder Control Cable Extensions K1797-25 - 25 ft. (7.6m)
K1797-50 - 50 ft. (15.2m)
Adapter Cable for Control Cable K1798
to Terminal Strip Power Sources
Order No. Description
K1842-10 Lug to Lug, 3/0, 600A, 60% duty cycle, 10 ft. (3.0m)
K1842-35 Lug to Lug, 3/0, 600A, 60% duty cycle, 35 ft. (10.6m)
K1842-60 Lug to Lug, 3/0, 600A, 60% duty cycle, 60 ft. (18.2m)
K1842-110 Lug to Lug, 4/0, 600A, 60% duty cycle, 110 ft. (33.5m)
456
CONTACT NOZZLE ASSEMBLIES
Description/Diameter Wire Order No.
Submerged Arc:
3/32” (2.4 mm) K231-3/32
1/8” (3.2 mm) K231-1/8
5/32” (4.0 mm) K231-5/32
3/16” (4.8 mm) K231-3/16
Positive:
3/32 - 1/8” (2.4 - 3.2 mm) K148A
3/32 - 3/16” (2.4 - 4.8 mm) K148B
Linc-Fill™ Attachments for Positive Contact Nozzle Asbly
Extension for K148
3/32” (2.4 mm) K149-3/32
1/8” (3.2 mm) K149-1/8
5/32” (4.0 mm) K149-5/32
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LT-7 T r actor
www.lincolnelectric.com
[3]
RECOMMENDED OPTIONS
GENERAL OPTIONS
Horizontal Fillet and Lap
Adapter Kit
Includes a rear guide wheel, head
tension spring and front guide
wheel assembly on an adjustable
arm which rides in the joint to
maintain alignment and electrode
angle. Kit includes separate front
guide wheel assemblies for fillet
and lap joints. Welds to the left
or right of the tractor’s center line.
Order K232
Flat Fillet Adapter Kit
Includes front and rear guide
wheels for operating the tractor in
30° or 45° flat fillet joints.
Order K229
Butt Seam Guide Kit
Mount in place of the standard
front wheel to ride in a V-groove
or open 1/8 - 3/8” (3.2 - 9.5 mm)
butt joint, keeping the wire in
required alignment.
Order K230
Track Conversion Kit
Converts the LT-7 standard model
for track guidance. Shown with
K396 track section.
Order K400
GENERAL OPTIONS
Tiny Twinarc Adapter Kit
Converts the LT-7 standard model
to Tiny Twinarc using 5/64” (2.0
mm) electrode. These kits may
also be used for horizontal fillets
with the addition of the K232
Adapter Kit.
Order K277-1 for Butt Seams
Order K277-2 for Flat Fillets
Track Section
Each provides 70 in. (1.8m) of
travel. To be used with the
K395-1, LT-7 Track Model.
Order K396
Flux Screen
For submerged arc welding.
Removes large particles from
reused flux. Includes air-driven
vibrator.
Order K310
Magnetic Flux Screen Separator
For submerged arc welding.
Removes foreign magnetic
particles from reused flux.
Order K58
Concentric Flux Cone Assembly
For use with the K148B, Positive
Contact Nozzle Assembly. Gives
concentric flux coverage around
the electrode.
Order K285
K396
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LT-7 STANDARD MODEL K227-1
LT-7 TRACK MODEL K395-1
REQUIRED OPTIONS
Control Cable See Page 2
Weld Power Cable See Page 2
Contact Nozzle Assembly See Page 2
RECOMMENDED GENERAL OPTIONS
Wire Feeder Control Cable Extensions See Page 2
Adapter Cable See Page 2
Linc-Fill™ Attachments See Page 2
Horizontal Fillet and Lap Adapter Kit K232
Flat Fillet Adapter Kit K229
Butt Seam Guide Kit K230
Track Conversion Kit K400
Tiny Twinarc Adapter Kit, for Butt Seams K277-1
Tiny Twinarc Adapter Kit, for Flat Fillets K277-2
Track Section K396
Flux Screen K310
Magnetic Flux Screen Separator K58
Concentric Flux Cone Assembly K285
RECOMMENDED POWER SOURCES
CV-655 see publication E4.40
DC-600 see publication E5.40
DC-655 see publication E5.46
DC-1000 see publication E5.50
DC-1500 see publication E5.60
TOTAL:
THE LINCOLN ELECTRIC COMPANY
22801 St. Clair Ave., Cleveland, OH 44117-1199 • 216.481.8100 • www.lincolnelectric.com
LT-7 TRACTOR ORDER FORM
PRODUCT DESCRIPTION ORDER NUMBER QUANTITY PRICE
CUSTOMER ASSISTANCE POLICY
The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment, consumables, and cutting equipment. Our challenge is to meet the
needs of our customers and to exceed their expectations. On occasion, purchasers may ask Lincoln Electric for advice or information about their use of our products. We respond
to our customers based on the best information in our possession at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability,
with respect to such information or advice. We expressly disclaim any warranty of any kind, including any warranty of fitness for any customer’s particular purpose, with respect to
such information or advice. As a matter of practical consideration, we also cannot assume any responsibility for updating or correcting any such information or advice once it has
been given, nor does the provision of information or advice create, expand or alter any warranty with respect to the sale of our products.
Lincoln Electric is a responsive manufacturer, but the selection and use of specific products sold by Lincoln Electric is solely within the control of, and remains the sole responsibility
of the customer. Many variables beyond the control of Lincoln Electric affect the results obtained in applying these types of fabrication methods and service requirements.
Subject to Change – This information is accurate to the best of our knowledge at the time of printing. Please refer to www.lincolnelectric.com for any updated information.
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