LT-MZ1222 Automatic Column & Boom Welding Manipulator for Longitudinal Seam Welding, Boom Travels Full Length of Seam for Shell Courses & Straight Seams

The LT-MZ1222 is a heavy-duty automatic column and boom welding manipulator engineered for full-length longitudinal seam welding of tank shell courses, pressure vessel barrel sections, and large-diameter cylindrical workpieces. When paired with welding turning rolls, it forms a complete automated welding workstation. The boom travels steadily along the entire length of the straight seam while the workpiece remains fixed, delivering continuous, repeatable straight welds for shell courses, rolled cylinder plates, and barrel segments.

The machine supports submerged arc welding (SAW) and gas shielded welding processes, compatible with carbon steel, stainless steel, and low alloy steel. It is widely used in tank fabrication, pressure vessel workshops, pipe manufacturing, and heavy steel structure factories. The same machine can also switch to circumferential girth seam welding, offering multi-scene flexibility for fabricators.

The cylindrical shell course or rolled plate is secured and supported on welding turning rolls, keeping the workpiece stationary during longitudinal welding. The horizontal boom carries the welding torch and travels along a precise horizontal track, moving the torch across the full length of the straight seam at a constant, pre-set speed. The system maintains stable arc length and consistent heat input from start to finish, producing neat, uniform, full-length longitudinal welds.

For ring joints on pipes or vessel shells, the workpiece rotates on turning rolls while the boom and torch remain fixed. The relative rotation creates continuous circumferential welds, enabling one machine to handle both straight and ring seams. All motion parameters are digitally controlled, removing human inconsistency and delivering stable weld quality in batch production.

Constructed from thick industrial steel plates with full welding and vibration stress relief treatment. The rigid column resists deflection and vibration during full-stroke boom travel, providing a solid foundation for precise torch positioning during long-seam welding.

Closed rectangular beam design with excellent anti-torsion and anti-bending performance. The horizontal travelling mechanism is driven by frequency conversion stepless speed regulation. The boom moves smoothly across the entire seam length, eliminating speed fluctuations that would cause uneven weld beads.

Motor-driven gear rack transmission enables stable, jitter-free vertical adjustment of the boom height. Operators can adjust torch height to match different shell diameters, plate thicknesses, and multi-layer welding procedures.

The torch holder supports three-direction micro-adjustment. Operators can finely align the torch center to the weld line, compensating for minor plate misalignment, weld gap variation, and multi-pass layered welding requirements.

Industrial PLC with color touch screen HMI. Operators can set travel speed, welding time, and save multiple welding recipes. Saved parameters for different shell thicknesses and seam lengths can be recalled with one click, reducing setup time between batches.

All power cables, signal lines, and gas hoses are routed inside heavy-duty drag chains. This protects cables from stretching, friction, and fatigue damage during repeated boom movement, extending machine service life and reducing downtime.

Equipped with upper/lower lifting limit switches, front/rear travel limit sensors, emergency stop button, and mechanical anti-collision devices. It prevents overtravel and collision risks for safe operation in heavy manufacturing workshops.

The boom maintains a constant travel speed across the entire seam length. Weld bead shape, fusion width, and penetration stay uniform from start to end. Welds meet NDT requirements for tanks and pressure vessels, free from undercut, porosity, and slag inclusion.

Optimized for long straight seams on tank and vessel shell courses. Stable linear travel eliminates the common defects of manual long-seam welding, improving the qualification rate of barrel sections.

One machine works for both longitudinal straight seams and circumferential girth seams. It covers the two primary welding processes for cylindrical product fabrication, maximizing equipment utilization and lowering factory investment.

Save parameter sets for common plate thicknesses and seam lengths. Switching between different shell course specifications takes minimal time, improving workshop throughput.

Works with most standard welding power sources and turning roll models. It can run as a standalone workstation or integrate into automated tank and vessel production lines.

Automated welding reduces dependence on highly skilled welders. Stable weld quality cuts repair, grinding, and rework expenses, lowering total manufacturing cost.

Stress-relieved heavy steel frame resists deformation under long hours of continuous operation. Simple routine maintenance and low failure rate make it suitable for 24-hour heavy workshop use.

This welding manipulator is widely adopted across heavy manufacturing sectors:

• Storage tank and silo shell fabrication
• Pressure vessel and boiler barrel manufacturing
• Large diameter steel pipe production
• Pipe spool prefabrication
• Heavy cylindrical steel structure processing

It resolves the limitations of manual long-seam welding, improves product qualification rates, increases production output, and shortens project lead times. It also mitigates the shortage of experienced welders, bringing reliable long-term return on investment for fabrication workshops.