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Ultrasonic welding · Spin welding

Spin welding

For circular joints and for the polyolefins ultrasonics fight — 100 to 4000 rpm, 2500 N, parts to ø300 mm, stopping within ±0.1°.

A different friction

For round parts, spin beats ultrasonics

Spin welding rotates one part against a fixed one under pressure. The friction melts the interface; rotation stops; the melt solidifies under load. Where the joint is circular it produces a stronger, more reliably hermetic weld than ultrasonics, on materials ultrasonics struggle with — polypropylene and polyethylene in particular.

Motor power1 kW · 2.5 kW · 4 kW · 5 kW
Spindle speed100 to 4000 rpm (servo drive to 2500 rpm)
Maximum force2500 N pneumatic
Maximum part diameterø300 mm
Vertical stroke100 mm
Spin time0.01 to 9.99 seconds, adjustable
ControlPLC with HMI panel · revolution mode or time mode
Angular accuracy±0.1° — parts stop in a defined orientation
Weight120 kg
Choosing between them

Spin or ultrasonic?

Choose spin welding when
  • The joint is circular
  • The material is polypropylene or polyethylene
  • You need a large-diameter hermetic seal
  • The part contains something ultrasonics would damage
  • The weld area is larger than one horn can drive
Choose ultrasonic when
  • The joint is any shape other than round
  • Cycle time must be under a second
  • The resin is amorphous — ABS, PC, PS, acrylic
  • Parts cannot rotate relative to each other
  • You also need staking, insertion or cutting from the same machine
The orientation question. Spin welding rotates one half. If your part has features that must line up — a spout, a bracket, printing — you need the ±0.1° stop control, and the joint has to be designed for it. Raise it early; it changes the tooling.
What gets spin welded

Typical parts

Filter housings & bowls

Fuel, oil, air and water filters — the classic spin weld application.

Reservoirs & tanks

Expansion tanks, washer bottles, coolant reservoirs.

Caps, closures & spouts

Where the seal has to hold pressure or vacuum.

Float chambers & sensors

Sealed assemblies containing a mechanism that ultrasonics would disturb.

Aerosol & pressure vessels

Where a genuinely gas-tight plastic joint is required.

Horticultural & irrigation

Polypropylene fittings and bodies that ultrasonics handle poorly.

Send us the part, not just the enquiry

Ultrasonic welding is decided by the parts — the resin, the wall, the joint and what the weld has to do. Send photos and drawings through the enquiry form and you get an engineered answer, not a price range.

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