A turntable welding fixture rotates the workpiece at a constant speed during welding and positions it precisely in front of the torch. This eliminates the need for the operator to manually reposition or rotate the component. Schnelldorfer Maschinenbau supplies welding rotary tables that are tailored to the workpiece, weld position, and existing machine—ranging from simple manual rotary tables to automated positioners for mass production.
Consistent Welding: How a Rotary Table Welding Jig Works
A rotary table welding fixture first securely clamps the workpiece onto a rotating clamping plate. The rotary table then positions the component at the desired angle and guides it past the welding torch at a constant speed. While the workpiece rotates, the torch remains in a fixed position. This produces a uniform circumferential weld without unnecessary weld joints.
The biggest difference from manual work lies in the constant motion. When a component is rotated by hand, the rotational speed inevitably varies. As a result, penetration depth, bead width, and surface finish can fluctuate. A motorized welding turntable, on the other hand, maintains the set speed consistently throughout the entire rotation. As a result, the welds are reproducible, with uniform width and penetration depth.
This consistency has a significant impact on quality, especially in multi-layer joints. Each layer is applied under comparable conditions, ensuring that the individual weld beads build neatly upon one another. If the table is also tiltable, a second axis of motion is added. This allows hard-to-reach areas to be positioned so that the torch can reach the seam under more favorable conditions.
Rotary Table Variants: From Manual to Robot-Compatible
Not every rotary table is designed for the same task: The main differences among the various models lie primarily in their drive systems, tilting capabilities, control options, and load capacity. Depending on the model, the load capacity ranges from about 170 kg for compact units to around 1,200 kg for heavy-duty positioners.
Typical designs include:
- Manual turntable: Rotation and locking are performed manually; suitable for individual parts and small batch sizes
- Motorized Positioner: The rotational speed can be adjusted and programmed, enabling the production of uniform circular seams in batch production
- Tilting rotary table: An additional axis positions the workpiece at various angles and improves accessibility
- Robot-compatible rotary table: The movement is synchronized with the welding robot and is suitable for automated processes and higher production volumes
In addition to the drive mechanism, the clamping plate also determines the subsequent application. Steel plates approximately 20 mm thick, for example, can withstand high point loads. For stainless steel components, however, separate clamping devices and tools are recommended to prevent cross-contamination from rust. Which design is ultimately the best fit therefore depends less on the catalog specifications than on the workpiece, its center of gravity, and the desired weld.
Welding Circumferential Seams with a Rotary Table: Manufacturing Benefits
A rotary table improves three key aspects when welding circular seams: seam quality, cycle time, and ergonomics. Positioning and rotation are performed in a single operation, so the workpiece does not need to be repeatedly released and realigned during the welding process. This reduces downtime while ensuring consistent, reproducible conditions.
Workplace safety also benefits from the stable mounting: The component does not need to be held or moved by hand during welding. At the same time, the height can be adjusted so that the operator can work as upright as possible and without having to maintain an awkward posture for extended periods. This significantly reduces the strain on the workplace, especially when working with heavy workpieces and during longer welding sessions.
The increase in productivity does not necessarily result from the actual welding process running faster. Rather, the key factor is the time saved between individual welds: less clamping, less realignment, and fewer manual steps. As soon as the same product is manufactured on a regular basis, it is precisely these non-productive times that make a noticeable difference in productivity.
Where is a welding rotary table used?
Welding rotary tables are used wherever circumferential welds are required on rotationally symmetric components. Typical workpieces for this application include pipes, flanges, vessels, and other round components.
For pipes, the rotary table handles the rotation while the torch remains in a fixed position. Our machines use the same principle for circumferential seams: When welding flanges to pipe ends, the constant rotational motion ensures that the circumferential joint is formed evenly and tightly.
In vessel construction, bottoms or nozzles can also be positioned so that the weld is made in a trough position whenever possible. This ensures that the molten pool is particularly stable and easier to control. The importance of securely holding the workpiece is also demonstrated by the way the workpiece is clamped during gas-shielded welding.
Whether such a welding system is economically viable ultimately depends on how often a comparable component passes through the production line. The rule is: The more frequently the same movement is repeated, the greater the impact of consistent positioning and reduced non-productive time.
Selecting the Right Clamping Plate, Tools, and Clamping Devices
Even the best welding rotary table is of little use if the workpiece is not clamped securely and consistently. That is why the right tools, clamping devices, and fixtures are always part of the overall design. Only they hold the component in the intended position and ensure that its center of gravity is truly aligned with the axis of rotation.
This is especially important when dealing with asymmetrical workpieces. Although a component may be light enough to be within the rotary table’s rated load capacity, it can still generate a high tilting moment if its center of gravity is far from the axis of rotation. Therefore, when designing the setup, the component’s weight, the clamping device, the distance from the axis of rotation, and the desired angle of inclination must all be considered together.
Interchangeable fixtures can sometimes be useful for different products. This allows the same table to be used for multiple component variants without having to rebuild the entire fixture each time. This significantly increases flexibility and also reduces setup times.
Combining a Rotary Table and a Welding Robot Effectively
In automated applications, the rotary table serves as an active positioner. Its movement can be synchronized with the robot controller while the welding robot guides the torch. Both axis systems then work together to ensure that the workpiece remains in an optimal position throughout the welding process.
This combination improves the quality of the welds and enables high-volume production. The robot does not even have to reach every contour through its own movement alone: instead, the positioner rotates or tilts the workpiece to align it with the weld. This allows for a smoother and more reproducible process, especially when working with more complex circular seams.
Proven Rotary Table Welding System from Schnelldorfer Maschinenbau
Schnelldorfer Maschinenbau develops and manufactures welding machines and custom solutions for demanding tasks in industrial manufacturing. This includes rotary table welding fixtures that securely hold workpieces, position them precisely, and enable smooth movement during welding. Depending on the component, weight, weld geometry, and desired level of automation, the appropriate rotary table is specifically tailored to the respective application—from a simple positioner to integration into a robot-assisted welding system.
Would you like to optimize your welding processes with a suitable rotary table welding fixture? Then talk to Schnelldorfer Maschinenbau about your application and get expert advice. We look forward to hearing from you!
Frequently asked questions (FAQ)
How does a rotary table differ from a welding table?
A conventional welding table is a fixed clamping surface, often with a grid of holes, on which workpieces are aligned and clamped. A turntable, on the other hand, moves the component during welding.
Is a turntable suitable for welding robots?
Yes. Welding rotary tables designed for use with robots can be synchronized with the robot controller. The rotary table then handles the positioning and rotation of the workpiece, while the robot guides the torch. This combination is particularly well-suited for higher production volumes and consistent quality.
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