AUTOMATIC WIRE FEEDERS
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.
Track Model Shown
Processes
Submerged Arc
Advantage Lincoln
•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.
Description
Output |
Input 115VAC |
Required Options
Control Cable, Weld Power Cable, Contact Nozzle Assembly
Recommended General Options
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
Recommended Power Sources
CV-655, DC-600, DC-655, DC-1000, DC-1500
Order
K227-1 LT-7 Standard Model
K395-1 LT-7 Track Model
TECHNICAL SPECIFICATIONS
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Wire Feed |
Wire Size Range |
Dimensions |
Net |
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Product |
Product |
Input |
Rated Output |
Speed Range |
Solid |
H x W x D |
Weight |
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Name |
Number |
Power |
Current/Duty Cycle |
ipm (m/min) |
in. (mm) |
in. (mm) |
lbs. (kg) |
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LT-7 |
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K227-1 |
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115 VAC |
600A/100% |
100 - 400 |
3/32 - 3/16” |
27.5 x 33 x 14 |
120 |
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Standard |
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50/60 Hz |
1100A/100% (with |
(2.5 - 10.2) |
(2.4 - 4.8) |
(698 x 838 x 356) |
(54) |
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LT-7 |
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K395-1 |
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water cooling) |
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130 |
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Track |
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(59) |
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Publication E9.70 12/03
www.lincolnelectric.com
A CLOSER LOOK
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).
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.
QUALITY AND RELIABILITY
•Three-year warranty on parts and labor.
•Manufactured under a quality system certified to ISO 9001 requirements.
REQUIRED OPTIONS
CONTROL CABLES
Description |
Order No. |
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Wire Feeder Control Cable |
K1822-25 |
- 25 ft. (7.6m) |
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Wire Feeder Control Cable Extensions |
K1797-25 |
- 25 ft. (7.6m) |
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K1797-50 |
- 50 ft. (15.2m) |
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Adapter Cable for Control Cable |
K1798 |
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to Terminal Strip Power Sources |
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WELD POWER CABLES
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5 |
6 |
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)
•Continuous Vertical Adjustment: 1-1/2” (38 mm) handweel variation for ESO (electrical stickout).
•Travel clutch operates from either side of the tractor.
•Rugged and durable design recognized throughout the industry for its long life and years of trouble-free wire feeding.
CONTACT NOZZLE ASSEMBLIES
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Description/Diameter Wire |
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Order No. |
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Submerged Arc: |
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3/32” |
(2.4 mm) |
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K231-3/32 |
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1/8” |
(3.2 mm) |
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K231-1/8 |
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5/32” (4.0 mm) |
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K231-5/32 |
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3/16” (4.8 mm) |
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K231-3/16 |
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Positive: |
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3/32 - 1/8” |
(2.4 - 3.2 mm) |
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K148A |
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3/32 - 3/16” |
(2.4 - 4.8 mm) |
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K148B |
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Linc-Fill™ Attachments for Positive Contact Nozzle Asbly |
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Extension for K148 |
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3/32” |
(2.4 mm) |
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K149-3/32 |
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1/8” |
(3.2 mm) |
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K149-1/8 |
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5/32” |
(4.0 mm) |
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K149-5/32 |
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LT-7 Tractor
[2] |
www.lincolnelectric.com |
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