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Ultrasonic welding

Join plastic in a fifth
of a second.

Presses, hand welders, spin and metal welding systems — with the joint design, materials and troubleshooting knowledge that decides whether any of it works.

An ultrasonic welding horn descending onto a moulded thermoplastic component held in a fixture
Horn, fixture, part. Everything else is amplitude, pressure and time.Illustration generated by Misonics.
What it is

Joining plastic without glue, screws or heat

Ultrasonic welding converts mains electricity into high-frequency mechanical vibration, drives it through one part into the joint, and uses the friction at that interface to melt and fuse the material. The weld takes a fraction of a second, adds no consumable, and leaves a joint as strong as the parent material when the joint is designed properly.

1GeneratorConverts 50 Hz mains to 20, 35 or 36 kHz electrical energy
2ConverterPiezoelectric stack turns that into mechanical vibration
3BoosterScales the amplitude up or down to suit the material
4SonotrodeCustom horn that couples the energy into your part
5FixtureHolds and supports the part so the energy goes to the joint

Four of those five are catalogue items. The fifth — the sonotrode — is made for your part, and it is the one that decides whether the process works. That is why a welding enquiry starts with the part, not the machine.

Why people move to it

Six reasons it replaces what you do now

No consumable

No adhesive, no solvent, no screws, no inserts. The cost per joint after the tooling is electricity.

Fractions of a second

Typical weld times are 0.2 to 1.0 seconds. Cycle time is usually set by handling, not by the weld.

Hermetic when you need it

The right joint design gives a genuine airtight, watertight seal — which adhesive rarely does repeatably.

Repeatable and measurable

Weld by time, energy, distance or absolute distance, with the result recorded per cycle. That is a process you can validate.

Clean

No fumes, no VOCs, no cure time, no shelf life. Matters in medical, food and electronics.

Scales

The same process runs on a bench press for prototypes and in a fully automated line at millions of parts a year.

The range

Machines, components and the process behind them

Before you buy anything

Three guides worth reading first

Most failed ultrasonic welding projects fail in the part design, not the machine. These three cover what decides success before a purchase order exists.

Watch it work

Welding on video

ProcessA weld cycle in slow motion — trigger, weld, hold
DesignEnergy director melting: what actually happens at the joint
ComparisonUltrasonic against adhesive and screws on the same part

Video placeholders — footage to be produced with our welding partner.

How we work on welding. Misonics is your Australian point of contact. Machines, tooling and application engineering come from our welding partner, who has run thousands of standard and custom applications — so your parts are assessed by people who weld for a living, and the quotation comes back engineered rather than estimated. You deal with us; the application work happens behind that.

Practically, that means the enquiry form asks for more than most. Resin and grade, wall thickness, joint type, what the weld has to achieve, volumes — and photos or drawings of both halves. Send that and the first reply is useful. Send “how much is a welder” and it will not be.

Start a welding enquiry Read the FAQ

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.

Start a welding enquiryBack to welding