A positioner is the cheapest quality improvement a shop can buy: every weld in the flat position, every time.
All positioners spin the part so the weld goes downhand. The difference is capacity, axes, and how the part is held.
250–2,000 lb class tables for small parts and TIG work. Tilt from horizontal to 90° and rotate continuously.
The classic: a table that tilts on one axis and rotates on another. Handles circular seams and multi-position joints.
A driven head and a free-spinning tailstock grip a part at both ends — built for long, heavy pieces and robotic cells.
Adds a third axis so the part can be flipped, tilted, and rotated — robot-synced for complex geometry.
Capacity is not one number. It drops as the table tilts, and it drops again as the load moves away from the center of the table.
| Tilt Angle | Centered Load | 4" Off-Center | 8" Off-Center |
|---|---|---|---|
| 0° (flat) | 100% of rating | ~85% | ~70% |
| 45° | ~70% | ~60% | ~50% |
| 90° (vertical) | ~50% | ~42% | ~35% |
The rating chart in the manual is the law. Off-center loads multiply torque: weight × distance from the rotation center. A 100 lb part hung 12" out is a different machine than a 100 lb part sitting centered.
Guess the weight wrong by 30% and you are off the chart. Add fixture weight — the plate and clamps count.
Spec sheets quote torque at the table face. Big diameter parts put moment on the gearbox — not just vertical weight.
A positioner run near its limit welds poorly and wears its drive fast. Buy the next class up when you are close to the chart.
Two motions do the work: rotation spins the part for circular seams, tilt angles the table so the weld face points up. Speed control decides the bead.
| Motion | Typical Range | Process Use |
|---|---|---|
| Rotation (Z axis) | 0.05–5 rpm | TIG needs slow and smooth; MIG production runs faster |
| Tilt (X axis) | 0° to 90° (some 135°) | Bring any weld face to flat or horizontal |
| Speed control | Variable, digital readout | Consistent surface speed = consistent bead pitch |
| Positioning accuracy | ±0.1° typical | Matters for repeat multi-pass welds and robot sync |
Match rotation speed to the weld: bead pitch (wire advance per revolution) sets the rotation. A 1/4" fillet on a 12" part runs roughly 0.2–0.5 rpm — dial in on scrap.
Any part that can be spun into the flat position welds faster, cleaner, and with less rework. These are the jobs positioners own.
Flanges, pulleys, and rings — rotate the part, hold the torch still, and lay a continuous bead in one setup.
Domes, nozzles, and shell seams on tanks up to a few tons — TIG root with smooth rotation, fill passes at speed.
Heavy cast and machined parts that are miserable to weld overhead become flat-position jobs on a tilt-turn table.
The positioner and robot weld as one program — the robot keeps the torch downhand while the table rotates the part.
Flanges onto pipe, elbows, and branch connections — spin the assembly and the root pass never changes angle.
Shafts, rollers, and worn housings rebuilt with build-up welds — rotation gives even heat and uniform overlay.
A positioner turns tons of steel on command — and does not stop for a hand. Treat the load chart and the motion envelope like the safety equipment they are.
The rating chart is a safety document. Never exceed it — especially off-center or at high tilt.
Tilt mechanisms and rotating tables crush fingers. Keep hands clear during motion and load parts at a stop.
Ground through the table with a dedicated lug — never through the bearings. Arc current through the drive destroys it.
Maintenance on a positioner means locked-out power. A rotating table with someone inside its arc is a fatality waiting.
Any part that can be spun into the flat position welds faster, cleaner, and with less rework. Start with the part's weight and size, then the orientation and speed the weld needs.
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