What the Attachment Does
The LT7 weld tracking system replaces the standard front wheel on your Lincoln LT7 tractor with a precision tracking wheel that rides directly inside the weld seam. As the tractor travels, the wheel mechanically guides the LT7 along the joint, maintaining consistent arc placement across long, uninterrupted runs without continuous operator correction. On large-diameter tanks, that consistency directly affects weld quality and code compliance.
Where It Performs
This attachment is engineered for field use on API 650 flat-bottom storage tanks, LNG tanks, where outside corner and horizontal seam welds run long distances. It is most effective on continuous lap and butt weld configurations, the same applications where an automatic tank welding machine setup demands repeatable, hands-off travel along the joint.
Installation and Field Setup
The LT7 tractor seam tracking device mounts to the existing LT7 front wheel carriage with no additional machined parts or specialized tooling. It is a bolt-on replacement that experienced LT7 operators can complete in the field without extended downtime. A full step-by-step guide is available in the downloadable installation PDF above.
Parts and Availability
Replacement tracking wheels and LT7 accessory components are stocked and available factory- direct through Tank Welding LLC. No third-party distributor lead times between you and the source. Contact Tank Welding LLC. by phone or email for pricing and parts availability.
The LT7 lap and butt weld seam tracking attachment replaces the original LT7 front wheel to enable the LT7 to track long distances of welding seam without as much guidance as some of the other front wheels.
LT7 Weld Seam Tracking Attachment Instal Guide – REV1
Tank Welding LLC.
Is your complete source for Automatic Storage Tank Welding Machines. We specialize in custom built to order automatic tank welding machines for LNG & flat bottom tanks. We have multiple standard site proven Automatic Girth Welder designs (AGW) / 3 O’clock Welder designs. Single pass gas shielded EGW (Electrogas Welder), single pass self shielded VUP / vertical UP Welders & AVW / multiple pass Automatic Vert Welders, Automatic Vert Buggy, Shell Buggy, Tank Jacking Equipment and complete Tank Jacking systems, automatic curved plate welders for pressure vessel / sphere / digester welding. This line of equipment is built with your choice of USA made Lincoln or Miller welding systems. The AGW travel is powered by top of the line twin German engineered inverter controlled drive motors.
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Frequently Asked Questions
What weld joints is this attachment compatible with?
It is designed for lap and butt weld seam configurations on tank shell courses. For fillet or irregular seam profiles, the standard LT7 front wheel options are the appropriate choice.
Does it work with all LT7 setups?
It replaces the front wheel assembly on standard Lincoln LT7 tractor configurations.
How does it reduce operator intervention?
The wheel rides inside the seam joint rather than on the plate surface, so the tractor self-corrects its travel path along the weld. On long shell course runs, this removes the repeated manual steering adjustments that accumulate into arc deviation and inconsistent bead placement.
Can this attachment be used on shop welds as well as field applications?
It is built for long, continuous production runs typical of field tank construction. It can be used in a shop setting, but its advantages are most apparent on the extended seam lengths that are common in large tank construction.
