Heavy Duty Circumferential Seam Welding System, Welding Manipulator Matched with Turning Rolls for Tank Girth & Ring Seam Fabrication

Circumferential seam welding, also known as girth seam or ring seam welding, is the most critical core process in the production of all cylindrical pressure-bearing equipment, including storage tanks, pressure vessels, boiler shells, large-diameter steel pipes and chemical barrels. The quality of circular welds directly determines the airtightness, pressure resistance and safety performance of finished industrial containers, and must pass strict non-destructive testing (NDT).

Traditional manual circumferential welding faces unavoidable industry bottlenecks. Manual torch shaking, unstable walking speed and inconsistent arc distance easily cause uneven penetration, undercut, porosity, slag inclusion, wavy weld beads and local incomplete welding. Manual circular welding requires highly experienced welders, resulting in high labor costs, low daily output, uncontrollable batch quality and extremely high rework rates.

Our Automatic Column & Boom Welding Manipulator is professionally optimized and upgraded for industrial circumferential girth seam welding. Cooperating precisely with welding turning rolls, it adopts the mature and most reliable industrial working mode: the turning rolls drive the cylindrical shell to rotate stably at a constant speed, while the welding manipulator fixes the welding torch at a precise constant position. The relative motion forms continuous, uniform, full-circumference high-quality ring welds.

This equipment completely replaces manual circular welding. It standardizes welding speed, arc length, swing range and penetration effect, ensuring 100% consistent weld quality for each tank and pressure vessel. It also supports longitudinal straight seam welding, realizing dual-purpose operation with one machine, greatly improving workshop equipment utilization and production efficiency.

The full set of automatic welding manipulator adopts a heavy-duty integrated thick steel plate welding structure, with ultra-high overall rigidity, strong shock resistance and permanent deformation resistance, fully adapted to long-term 24-hour heavy-load industrial welding.

1. Place the welded cylindrical workpiece (tank shell, pressure vessel barrel, pipe section) stably on the welding turning rolls.
2. The turning rolls provide stepless constant-speed rotary driving force, ensuring uniform rotation of the shell without slipping or shaking.
3. The column boom manipulator precisely adjusts the welding torch's height, horizontal distance and left-right swing position to accurately align the circumferential weld gap.
4. During welding, the workpiece rotates continuously, while the welding torch remains mechanically fixed. The relative uniform motion forms smooth, dense, uniform and full-penetration circular girth seams.

This fixed-torch rotary-workpiece welding method is internationally recognized as the most stable and highest-quality solution for large cylindrical circumferential seam welding.

• Vertical Heavy-duty Column: Made of thickened national standard steel plate through secondary stress-relief welding. It features high vertical straightness, strong bearing capacity and no shaking during lifting and welding, providing ultra-stable overall support for the whole machine.
• Precision Telescopic Welding Boom: High-rigidity rectangular boom structure, with smooth horizontal telescopic movement and uniform feeding speed. Effectively avoids welding jitter and trajectory deviation, ensuring a straight and stable welding track.
• Gear-Rack Lifting System: Motor-driven precision gear-rack transmission, with stable lifting, accurate positioning and no jitter. It can precisely adjust the torch height according to different workpiece diameters and welding layers.
• Frequency Conversion Horizontal Travelling Mechanism: Stepless speed regulation, adjustable welding speed in real time, adapting to different steel materials, wall thicknesses and welding process requirements.
• Multi-Directional Torch Fine-Tuning Device: Supports X, Y, Z three-dimensional micro-adjustment and swing fine-tuning. Operators can accurately calibrate the torch aiming position for irregular weld gaps and multi-layer multi-pass welding.
• Intelligent PLC Touch Control System: Visualized full-touch operation, supports welding parameter storage, recipe saving, one-key recall and multi-group parameter preset. It realizes one-click switching of different tank specifications without repeated debugging.
• Full-Coverage Cable Drag Chain Protection: All power cables, control lines and gas circuits are fully protected by industrial drag chains, preventing pulling, abrasion, bending damage and aging during long-term reciprocating movement.
• Multi-Level Industrial Safety Protection System: Equipped with upper and lower lifting limit switches, front and rear travel limiters, emergency stop buttons and anti-collision devices to completely avoid equipment overtravel, collision and safety accidents.

Model: LT-MZ1222 Standard Welding Manipulator

This automatic welding manipulator is widely used in heavy industrial manufacturing fields requiring high-standard circular welds:

• Pressure vessel and boiler manufacturing industry
• Petroleum, chemical and environmental protection storage tank production
• Large-diameter steel pipe and pipeline engineering fabrication
• New energy pressure cylinder and container processing
• Heavy steel structure cylindrical workpiece welding

It is the standard essential equipment for standardized production of all cylindrical pressure-bearing containers.

For tank and pressure vessel manufacturing enterprises, circumferential weld quality determines product qualification rate and market reputation. This automatic column boom welding manipulator completely solves the pain points of unstable manual ring seam welding, high defect rate and difficult worker recruitment.

It achieves standardized, automated and high-efficiency circular welding production, stabilizes product quality, increases daily output, shortens delivery cycles and reduces comprehensive production costs. With rugged industrial structure, low maintenance rate and long service life, it provides stable and long-term high return on investment for heavy welding workshops.