Casting L-Type 200-400kg Two Axis Welding Positioner ±0.06mm for Robot Cells

Casting L-Type Two Axis Welding Positioner for 200-400kg Workpieces

The GBS-02-L series is a casting L-type two axis positioner built on a cast iron frame that keeps vibration low while a robot welds. The L-shaped layout puts the workpiece on a Φ500mm T-slot table that tilts ±135° on the first axis and rotates ±360° on the second, so a seam can be presented to the torch in the flat or horizontal position instead of overhead. Two load classes cover 200kg and 400kg, and the table repeats to ±0.06mm measured at the Φ500mm circle, which is close enough for robot programs to run without touch sensing on every part. The positioner is driven as a robot external axis from the robot controller and runs on 380V three-phase power, with a 500A welding current path through a 95mm² cable. For fabricators moving from manual benches to a robot cell, this 200-400kg welding turntable is the usual first step because it removes the flip-by-crane bottleneck without changing the welding process.

Technical Specifications

Advantages of the Cast Body Design

• Damping: the cast frame absorbs welding vibration better than a light welded frame, protecting the ±0.06mm repeatability over years of production.
• Two axis in one fixture: tilt and rotation combine to reach both sides of a part without unclamping it.
• Robot-native motion: both axes are external axes of the robot, so positioner moves and torch moves are programmed in one coordinate system.
• Stable welding circuit: a 95mm² cable and 500A capacity keep current steady through the rotating joint.
• Simple fixture changes: the T-slot table accepts quick-change plates for different workpiece families.

Typical Applications

• Welding of brackets, arms and small frames in job shops
• Automotive sub-assemblies such as seat frames and suspension parts
• Pump and valve bodies requiring weld access from two sides
• Sheet metal cabinets and chassis parts with mixed batch sizes
• Repair welding cells where parts arrive in small lots

Frequently Asked Questions

Q: Why choose a casting L-type two axis positioner rather than a standard turning table?
A turning table only rotates. The L-type adds a tilt axis, so gravity keeps the weld pool in the flat position and the robot can reach the second side of a part without a manual flip.

Q: Can the 200-400kg welding turntable be added to an existing robot cell?
Yes, provided the robot controller has free external axis channels and the safety circuit can include the positioner. We supply the drive parameters and integration notes for KUKA, FANUC, ABB and YASKAWA controllers.

Q: What keeps ±0.06mm repeatability after years of welding heat?
The cast body is machined after stress relief, the rotary joints use preloaded bearings and the drive is protected from spatter. Periodic backlash checks are part of normal maintenance, and the accuracy figure is measured at the Φ500mm table edge.

Q: What floor space and power are required?
Allow clearance for the ±135° tilt envelope plus the workpiece, and anchor the base to a level concrete floor. Power is 380V three-phase, with the welding return routed through the positioner earth brush.

Production and Support

Gongboshi Robot Technology has supplied welding positioners and robot external axes since 2016, working with aerospace, automotive, chemical and new-energy customers from a Shanghai base with more than 100 engineers. Cast bodies are inspected before machining, assemblies are run in under load, and each unit ships with a test record, wiring diagram and fixture interface drawing. Standard models leave the factory in 20-35 working days, and every 0.06mm repeatability robot positioner carries a 12-month warranty with remote commissioning support.