Ultrasonic Spot Welding

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Ultrasonic spot welding

Process by which the plastic can be spot-welded, without a specific joint designed on the welding interface.

SONIC ITALIA SRL
Viale de Gasperi, 76
20017 RHO (MI) Italia

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Ultrasonic spot welding is when plastics are subjected to binding at certain points without the need of a specific joint design.

It is commonly used to apply sturdy structural welding points in multiple parts, such as extruded sheets or plastic parts of complex shapes.


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Ultrasonic spot welding is widely employed to manufacture vacuum sealed blister packs in order to get an airtight closure to avoid tampering. Most thermoplastics can be spot welded using ultrasonics. 


A custom-made sonotrode penetrates the top layer (the thinner of two parts) and fuses them together. The displaced molten part is then entrapped into a custom-shaped heading on a spot of the top layer, welding at an interface level. This heading's diameter is on average three times as thick as the first stratum — i.e. a 1mm thick upper part will have approximately a 3 mm raised ring, and a height up to 1mm. The bottom side will show no signs of indentations or markings.


Composite sonotrodes with interchangeable tips are available as standard spot welding components. Tip shape selection and use is quick and simple, allowing for items with a 3 mm thickness to be soldered this way. The bottom layer can be thicker than the top one. The spot binding process is versatile, fast and easy to use, with a manual handgrip that facilitates maneuverability.


Visit our Youtube channel and see Sonic Italia's multiple applications.


Basic Guidelines for Ultrasonic Spot Welding


  • Low pressures
  • Medium to high amplitudes
  • Rigid support placed directly under the contact spot

More information about Sonic Italia's ultrasonic spot welding solutions


If you further questions about spot welders, do not hesitate in contacting us. We will gladly answer any question you may have. Find out more by browsing our website. You will find a presentation of our product and research range there.


Do you want free advice from our experts? Then fill out the contact form above.



Nonwovens seaming
Solutions for welding non-woven fabrics. Materials can be either 100% acrylics or blends.


Plastic assembly systems
It is used when both high aesthetic quality and production speeds are required.


Synthetic fabrics weaving
Customized bonding solutions for non-wovens and synthetic fabrics.


Ultrasonic cutting
Sonic Italia manufactures state of the art machinery for incising thermoplastic materials.


Ultrasonic food cutting
Ultrasonic blades suitable for almost all kind of food cutting with different frequencies.


Hemetic sealing
Friction generates heat from the molecular movement of two plastic films at a contact spot with a vibrant horn.


Ultrasonic sewing machine
This process is versatile – you can seam, cut, slit, trim, tack, emboss, or cut and seal simultaneously.


Ultrasonic food slicer
Solutions that can be integrated in semi or fully automated food portioning machines.


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


Ultrasonic tools
Instruments for customised cutting and welding solutions.


Ultrasonic welding 
Discover more about energy directors' developement.


Hand-held Ultrasonic Welder 
A maneuverable ultrasonic tool for spot soldering.


Manure Belt Welder 
Discover more about our manual welder, designed for repairing manure and egg conveying belts.


Film and fabrics sealing 
Applications for the apparel, non-woven, packaging and textile industries.


Ultrasonic riveting
Insertion of a threaded brass rivet within a plastic component.


Ultrasonic blades 
Sonic Italia's mechanical department develops blades of all shapes and sizes.


Ultrasonic Linear Circular Weaving Cutter
Suitable for for manufacturing raffia products.


Ultrasonic Punching
Solutions for plastics, acrylics and synthetic filters.


Bonding Systems For Pleated Filters 
This environmentally friendly system does not require the use of solvents or adhesives.


Ultrasonic Sonotrode
Thirty years’ experience in manufacturing customized sonotrodes.


Ultrasonic Spot Welding
Available in manual and automatic versions.


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

Applications

automotivetessileplasticafiltrazionealimentarepackaging

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