Heavy Duty Longitudinal Seam Welding Manipulator, Column Boom Welding Machine for Tank Shell Course Straight Seam Fabrication

The LT-MZ1222 is a heavy-duty longitudinal seam welding manipulator engineered for precision straight seam welding of tank shell courses, pressure vessel barrels, rolled cylinder plates, and large tubular segments. This automatic column and boom welding machine delivers consistent, full-length weld quality for cylindrical fabrication in storage tank, boiler, and pressure vessel manufacturing.

Longitudinal straight seam welding is the most critical process in manufacturing tank shell courses, pressure vessel barrels, rolled cylinder plates, and large tubular segments. The structural strength, pressure resistance, and safety performance of cylindrical equipment depend entirely on the quality of long straight welds.

Traditional manual longitudinal welding presents significant technical drawbacks: unstable travelling speed, inconsistent arc distance, fluctuating heat input, and difficult full-length control. These issues commonly cause incomplete penetration, staggered weld beads, undercut, porosity, and slag inclusion — resulting in low qualification rates, extensive rework, and slow production progress.

The LT-MZ1222 automatic column & boom welding manipulator is purpose-built for standardized long-seam welding of cylindrical shell plates. Unlike circumferential welding mode, this equipment uses a fixed workpiece with a moving welding torch working principle for longitudinal seams. The welding boom travels stably through the full length of the straight seam, achieving uniform speed, fixed track, and consistent heat input throughout the entire welding process. Matched with welding turning rolls to secure the shell plate position, it forms a professional automatic longitudinal seam welding workstation for tank and pressure vessel factories.

This manipulator supports multiple welding processes including submerged arc welding (SAW) and gas shielded welding. It adapts to carbon steel, stainless steel, and alloy steel plate welding, and is widely used in storage tank manufacturing, boiler production, pressure vessel processing, and large-diameter pipe rolling workshops. The machine can also switch freely to circumferential welding mode, providing dual-purpose functionality.

1. Fix the rolled shell course or flat cylinder plate on the turning rolls to ensure zero displacement and zero vibration during welding.
2. Adjust the column height and boom extension position, calibrate the welding torch through the three-dimensional fine-tuning mechanism, and accurately align the long weld centerline.
3. Set welding speed, arc length, and travelling parameters via the touch screen system.
4. The horizontal boom drives the welding torch to move linearly and steadily at a constant speed, travelling the full length of the straight seam.
5. Complete one-time continuous forming of long longitudinal welds with uniform penetration, flat surface, and consistent fusion width.

When producing pipe fittings and vessel ring seams, the workpiece rotates at a constant speed while the welding head remains stationary, realizing high-precision girth seam welding. One machine meets all welding needs of cylindrical workpieces.

This automatic welding manipulator is widely used in high-standard heavy manufacturing industries:

• Large storage tank and silo shell fabrication
• Pressure vessel and boiler barrel manufacturing
• Steel plate rolling and cylindrical segment processing
• Large-diameter straight pipe and pipe spool production
• Environmental protection and chemical equipment cylindrical workpiece welding

It effectively solves the problems of unstable manual welding quality, insufficient welder manpower, and low production efficiency, helping manufacturing enterprises improve product competitiveness, shorten delivery cycles, and obtain long-term stable economic benefits.