Automatic Column Boom Welding Manipulator for Circumferential Seam Welding, Weld Girth Seams & Ring Seams on Tanks and Pressure Vessels

The LT-MZ1222 column and boom welding manipulator is engineered for automated circumferential (girth and ring) seam welding on pressure vessels, storage tanks, boiler shells and large-diameter cylindrical workpieces. Paired with welding turning rolls, it delivers uniform, repeatable welds around the full circumference while the welding head remains fixed in a precise position.

Circumferential (girth / ring) seam welding is one of the most critical processes in manufacturing pressure vessels, storage tanks, boiler shells and large-diameter pipes. Traditional manual ring seam welding suffers from well-known drawbacks: inconsistent torch position, uneven weld penetration, irregular bead appearance, high defect rates and heavy reliance on highly skilled welders. These issues lead to frequent rework, failed non-destructive testing and low production throughput.

The LT-MZ1222 column and boom welding manipulator is specially engineered for automated circumferential seam welding. Working in coordination with pipe turning rolls, the turning rollers slowly and steadily rotate the tank shell or cylindrical workpiece while the welding head remains fixed in a precise position. This setup delivers uniform, repeatable ring and girth welds all around the cylinder. The system can also be configured for longitudinal seam welding, offering flexible multi-scene use for heavy fabrication workshops.

This welding manipulator is widely adopted by pressure vessel factories, chemical tank manufacturers, boiler plants, oil & gas equipment workshops and steel structure companies. It can pair with submerged arc welding, MIG and MAG welding power sources to meet different material and thickness requirements for carbon steel, stainless steel and alloy steel cylindrical workpieces.

The complete system consists of a heavy vertical column, horizontal telescopic boom, vertical lifting drive unit, horizontal travel mechanism, multi-axis welding torch fine adjustment assembly, electrical control cabinet, cable drag chain assembly and multi-level safety protection devices. It is normally used together with welding turning rolls to form a complete circumferential seam welding workstation.

The vertical column uses thickened welded steel construction, delivering exceptional rigidity and resisting deflection during long-hour continuous operation. The horizontal boom carries the welding torch assembly and can extend forward to cover large workpieces. The gear-rack lifting system smoothly raises or lowers the boom to adjust torch height according to shell diameter.

The workpiece is placed on turning rolls. The turning rolls rotate the shell at a constant, adjustable speed. The manipulator locks the welding head in the correct position above the joint. The welding torch stays stable while the cylinder rotates, producing continuous, uniform ring seams.

The torch holder supports X/Y/Z micro-adjustment, allowing operators to fine-tune the torch position to align perfectly with the weld gap. All cables and hoses are routed inside drag chains to prevent abrasion, pulling damage and premature aging during repeated movement. Built-in limit switches and emergency stop buttons protect the machine and operators from collision and over-travel accidents.

This automatic welding manipulator is widely used across heavy manufacturing sectors:

• Pressure vessel and boiler manufacturing
• Oil, water and chemical storage tank fabrication
• Large diameter steel pipe and pipeline component production
• Environmental protection and new energy cylindrical equipment
• Heavy steel structure and cylindrical mechanical part processing

It is the preferred equipment for ring seam, girth seam and longitudinal seam welding of cylindrical shells.

Investing in this LT-MZ1222 column and boom welding manipulator upgrades your tank and vessel welding process. It stabilizes weld quality, improves product pass rate and increases daily output. Automated circumferential welding solves the shortage of skilled welders and reduces production costs.

Built for heavy industrial use with robust construction and low maintenance demand, this welding manipulator delivers reliable long-term operation and strong return on investment for tank and pressure vessel fabricators.