Circumferential Seam Welding System, Stable Rotation Speed for Uniform Weld Seams, for Tank & Pressure Vessel Fabrication

This circumferential seam welding system is an integrated automated solution designed for cylindrical workpieces including storage tanks, pressure vessels, boiler shells, and large-diameter steel pipes. Combining a heavy-duty welding roller rack and a welding manipulator, the system completes the full workflow of rotating, welding, and inspecting circumferential seams in one workstation.

The system consists of two major modules: a heavy-duty welding roller rack and an automatic welding manipulator.

Welding Roller Rack: The roller rack supports the cylindrical workpiece and delivers steady rotary motion. The roller assembly bears the full weight of the shell and keeps the workpiece rotating concentrically without axial drift or vibration. The variable-frequency drive enables precise adjustment of rotation speed to match different welding processes.

Welding Manipulator: The manipulator is mounted above the workpiece, holding the welding torch. It can move horizontally and vertically to align the torch precisely on the circumferential seam. The manipulator synchronizes with the rotating roller rack to maintain a fixed torch gap and welding angle during the full circle of welding. After welding, the workstation can also be used for visual inspection and surface finishing of the weld seam without re-clamping the workpiece.

The base of the roller rack is fabricated from thick steel plates and profiles, processed with stress relief annealing to eliminate internal stress. It maintains stable geometry under long-term heavy load. The rollers are wrapped with high-performance polyurethane material to prevent scratches on the workpiece surface. The electrical control cabinet integrates a frequency converter, operation panel, and safety protection circuits. Operators can set rotation speed, forward/reverse motion, and emergency stop locally or via optional remote control.

This circumferential seam welding system is widely used for pressure vessel manufacturing, chemical storage tank production, boiler fabrication, oil & gas equipment, water treatment tanks, wind power tower barrels, and large steel pipe fabrication. It serves pressure vessel plants, chemical machinery factories, boiler workshops, and heavy steel structure manufacturers.

By adopting this circumferential seam welding system, manufacturers can standardize the quality of circular welds for tanks and pressure vessels. Stable and uniform seams greatly improve the qualification rate and pass rate of non-destructive testing. The integrated rotate-weld-inspect workflow cuts auxiliary time and improves overall workshop throughput. The flexible design supports multi-specification production and optimizes factory floor space utilization. It helps enterprises upgrade their automation level, win more high-end and export orders, and gain stronger competitiveness in the heavy fabrication industry.