Ultrasonic Rotary Spin Welding Machine
A rotary spin welding machine joins two halves of a round thermoplastic part by friction: one half is clamped in the spinning head, the other sits in the fixture below, and the head presses them together and rotates them against each other until the joint face melts. The joint sets under pressure as the plastic cools — strong, clean and hermetically sealed.
Friction makes the joint, pressure sets it
The joint is made round the whole circumference in a single pass
The lower half of the part is located in the fixture on the station and the upper half is held in the spinning head, both on the same axis. The head comes down, presses the two halves together and spins them against each other. Friction melts the plastic at the joint face in a ring around the part.
When the rotation stops, the melt is held under pressure until it sets. There is no welding path to track and no seam to travel along, so the cycle time does not change with the size of the part — which is why the process is the standard choice for round parts: filters, floats, canisters, cups and closures.
One welded frame: the base, the table and the head
Rigid enough for the weld to repeat at volume
The machine is built as a single unit. A heavy-duty, stable machine base carries the turntable and the welding head, and the turntable sits on a thickened base mould, so the head and the table stay true under load. That rigidity, more than any setting on the panel, is what makes one weld like the next.
The electronic control part is placed inside the chassis rather than in a separate cabinet, which gives an integrated structure, a tidy machine and flexible installation on the line.
The machine uses a complete set of high-quality components imported from Japan, Taiwan and Korea, for stable performance and reduced labour per part.
Pneumatic drive, PLC timing, air held steady
Two systems run the machine. A pneumatic system controls the rotation of the turntable, so every station arrives in exactly the same place, and it holds the head at a controlled pressure for the whole cycle. A PLC programmable time control runs the welding time, the index and the sequence, and is straightforward both to set up and to change.
The air preparation unit sets and holds the working pressure, so each cycle starts from the same point and the weld depth does not drift with the shop air supply. Welding parameters are set digitally — intuitive and accurate — and current and time are controlled through the welding process, which raises weld quality and keeps one part like the next.
Four steps from loading to a finished part
Load the part
The lower half goes into the fixture on the station and the upper half into the spinning head, so both are held on the same axis.
Index the table
A PLC drives the pneumatic index and brings the station under the head, so every part arrives in the same place.
Press and spin
The head clamps the part and rotates it against the lower half. Friction melts the joint face while current and time are held through the weld.
Hold, then unload
Rotation stops and the part stays under pressure while the joint sets. The table indexes on, and the next part is loaded while the finished one is taken off.
Round, rigid and sealed — where the process fits
The joint is made by rotation, so the part has to be a body of revolution: two mouldings that share one axis and meet on a face square to it. Within that limit the process is quick and clean, and needs no adhesive, no gasket and no O-ring.
Both halves have to be the same family of plastic and rigid enough to carry the friction load — a soft or foamed part absorbs the rotation instead of melting at the joint face. Shrinkage of the mouldings matters more here than in most assembly methods, because it decides how well the two faces meet.
Two mouldings on one axis, meeting on a common face — filters, floats, canisters, cups, closures, small tanks.
The melt runs right round in one pass, so the result is a hermetic joint without adhesive, gasket or O-ring.
Nylon, ABS, SAN, PP, PE and PS all weld. The two halves should be the same plastic family so they melt at the same point.
Three to twenty-four stations on one table
The machine is built around a multi-station automatic turntable. Because loading, welding and unloading happen at the same time on different stations, the table keeps turning and the machine suits volume production rather than one-off parts.
Chosen from the cycle time and the output the line needs, so welding and loading overlap instead of taking turns.
Machined to the part, so the weld position and the press depth are set by the tooling rather than by the operator.
The PLC sets the welding time and the index; the pneumatic system brings every station to the same position.
What decides the station count and the power
Welding diameter
The joint circumference sets the power the head has to deliver. Welding areas from Ø150 to 350 mm are covered by the range; larger parts are quoted from the drawing.
Cycle time
Welding time runs from 0.01 to 9.99 s, plus the hold time while the joint sets. That figure, not the machine, decides how many parts one station produces in an hour.
Output and operators
Stations are added until welding and loading overlap without waiting. More stations let one operator keep several parts in progress at once.
Material and wall section
Nylon, ABS, SAN, PP, PE and PS weld, but the wall section and the joint design decide the power and the press depth that give a sound joint.
Eight things that make the weld repeat
Stable, precise operation
A heavy-duty machine base and a thickened turntable base mould keep the head and the table rigid, which is what makes the weld repeat.
PLC programmable control
A PLC time control system runs the welding time, the index and the sequence, and is straightforward both to set up and to change.
Pneumatic turntable indexing
The pneumatic system controls the rotation of the turntable accurately, so parts arrive in position time after time and the welding result stays even.
Automatic control
Welding is largely automatic, with intuitive and accurate digital setting of the welding parameters.
Current and time controlled
Current and time are held through the welding process, which raises weld quality and keeps one part like the next.
Integrated structure
The electronic control part sits inside the chassis, giving a tidy machine and flexible installation on the line.
3 to 24 station turntable
A multi-station automatic turntable, from 3 to 24 stations, makes the machine simple, efficient and suitable for large-scale production.
High-quality components
A complete set of components imported from Japan, Taiwan and Korea is used, for stable performance, reduced labour and higher production efficiency.
Machine data and what comes with it
Ultrasonic Rotary Spin Welding Machine Specification
| Specification | Data |
|---|---|
| Working frequency | 20 kHz, 15 kHz |
| Power | 2000 W, 2600 W, 3200 W, 4200 W |
| Welding time | 0.01 to 9.99 s |
| Welding area | Ø150–350 mm |
| Voltage | 220 V |
| Warranty | 2 years |
| Welding material | Nylon, plastic, ABS, SAN, PP, PE, PS, etc. |
| Application industry | Toys, electronic products, automotive products, medical products, household appliance industry, etc. |
What is supplied with a machine
| Turntable | Built with the number of stations the cycle time calls for |
| Fixtures | Machined to your part, one per station |
| Control | PLC with the welding parameters saved for the next run |
| Air set | Air preparation unit, regulator and gauge fitted |
| Testing | The machine is run on your part before it ships |
| Warranty | Two years on the machine |
Toys, electronics, automotive, medical and appliances
The process is used wherever a round moulding has to be closed and sealed without adhesive. Send us the part and the plastic and we will confirm the station count, the fixtures and the cycle time.
Automotive
Filters, reservoirs, floats, canisters and round under-bonnet parts that have to be sealed as well as strong.
Medical products
Round housings and single-use assemblies where the joint has to be hermetic and the same on every part.
Electronic products
Round enclosures, sensors and fittings joined without adhesive, so nothing inside the product is affected.
Toys and consumer goods
Balls, wheels, containers and closures, welded round the full circumference in a single cycle.
Household appliances
Round parts for small appliances and fittings that must not leak in service.
Fixtures cut for your part, parameters kept for the next run
Fixtures are machined for the component being welded and the machine is then run on it, so what arrives is a machine that already fits your part rather than one you have to tool up yourself.
The turntable is built with the station count the cycle time calls for, and the welding parameters are saved on the PLC so the same settings can be recalled for the next production run. Replacement fixtures and wear parts are available for the life of the machine, and the two-year warranty covers the machine itself.
Other plastic welding equipment
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Questions buyers ask before ordering
How many stations do I need?
Station count depends on cycle time and output; we size it from your target parts per hour.
Can different products share one machine?
Yes — with quick-change tooling, one rotary cell can run several part families.
What's the typical cycle time?
Cycle time is set by part geometry and melt; we confirm it after a trial weld.
Is a rotary cell hard to maintain?
It is a standard rotary indexer with servos; routine lubrication and checks keep it running.
Send us the round part and we will size the machine
Tell us the part, the plastic and the output you need. We will come back with the model, the number of stations, the fixture design and the cycle time.
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