LT7 Magnetic Device Attachment
The Problem With Outside Corner Welds
On flat-bottom and LNG storage tanks, the annular plate overhangs the shell plate by a minimum of 2″ / 50mm. That overhang leaves the LT7 without enough surface to run on using its standard configuration. The result without the right attachment is a manual weld at the tank base, slower, less consistent, and harder to inspect against code requirements.
What the Attachment Does
The LT7 magnetic device bolts to the LT7’s existing lifting point. No machining. No additional hardware. The magnetic assembly holds the machine against the annular plate overhang and keeps it tracking along the outside flange through the full corner weld sequence. A downloadable installation guide is linked at the top of this page.
Where It Fits in the Workflow
This attachment is designed for use at the tank base, after shell plate fit-up, when the outside corner weld needs to be completed with automated passes. It works within the same workflow where Tank Welding LLC.’s automatic girth welder handles horizontal shell seam welding higher up the tank, keeping the full construction sequence automated from bottom to top.
Flat-bottom storage tanks with the standard minimum of 2″ / 50mm annular plate overhang
LNG tank construction requiring consistent outside corner weld profiles
Sites where the LT7 is already in use for girth or seam welding
To discuss ordering the LT7 welding accessory as a standalone unit or as part of a broader LT7 package, contact Tank Welding LLC. directly for factory-direct pricing.
The LT7 magnetic device bolts onto the LT7 lifting point so the LT7 can travel on 2″ (50mm) of plate that extends past the shell plate and welding the outside tank corner weld.
LT7 Magnetic Attachment kit installation guide 09.30.2021
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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