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Ultrasonic spot welding


Ultrasonic multiple welding automation

Ultrasonic spot welding plastic automation


Ultrasonic spot welder for Textile

Manual spot ultrasonic welding for synthetic fabrics.


Viale de Gasperi, 76
20017 RHO (MI) Italia




Ultrasonic spot welding: a process where plastics can be spot welded without needing a specific joint design. Spot welding is popularly used when strong structural welding points are desired in large workpieces, sheets of extruded or cast plastics, and parts with complex shapes where accessibility is difficult.


It is also used to weld vacumn formed blister packs to provide tamper evident sealing.
Most thermoplastics can be ultrasonically spot welded.

In ultrasonic spot welding, a specially designed spot welding tip penentrates the top layer (the thinner of the two parts), and part way through the second layer, melting the plastic on its way.
The displaced melt is trapped into an aesthetic head on the top layer, and the weld occurs at the interface. The diameter of this head averages three times the top layer thickness -- i.e. a 1mm thick upper part will have a raised ring, approx dia 3mm, and height upto 1mm. The bottom side shows no indentations or markings.


Tapped Catenoidal Horns with replaceable tips are available as standard for spot welding applications. Tip selection and use (in accordance with top layer thickness of part to be welded) is thus easy and simple. Parts up to thickness of 3 mm (top layer) can be ultrasonic spot welded in this way. The bottom layer may be any thickness greater than the top layer. The Ultrasonic Spot Welding process is versatile, fast and easy to use - the ultrasonic stack is often hand-held, and aligned manually.

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Basic Guidelines for Ultrasonic Spot Welding


  • Lowpressure
  • Medium to high amplitude
  • Rigid support directly under the weld are


More information about ultrasonic spot welding and Sonic Italia


If you have additional questions about the spot welder, please contact us. We will be more than happy to answer any questions you may have. You can also learn more by browsing our site, where you will find a presentation of our product range and research. Fill out the contact form .




Nonwovens ultrasonic welding
Ultrasonic welding solutions for welding non-woven fabrics. Materials can be 100% acrylics or blends.

Plastic assembly systems
Ultrasonic plastic assembly is used when  high aesthetic quality and high production speed are required.

Ultrasonic bonding
Customized ultrasonic bonding solutions for synthetic fabrics and non-wovens.

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Ultrasonic sealing
Ultrasonic technology generates the heat for a friction process and for sealing process from within the plastic film.

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Ultrasonic slicer
Ultrasonic cutting systems integrated in automatic or semi automatic slicers.

Ultrasonic slitting
Ultrasonic slitting is the most efficient solution for a clean cut which prevents unraveling.

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Ultrasonic welding
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Manual ultrasonic cutting and welding solution for manual cutting and spot welding.

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Ultrasonic blades
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Ultrasonic Punching
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The rotary bonding system designed for pleated filters is "green" because it does not require the use of solvents or adhesives.

Ultrasonic Sonotrode
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Ultrasonic Spot Welding
Ultrasonic spot welding is possible both in automations and manually.

Ultrasonic Stud Welding
Ultrasonic Stud Welding is the suggested option when similar plastics parts need to be welded at single or multiple localised points.


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