Vibration welding

The assembly of thermoplastic materials using vibration welding occurs when two surfaces that come into contact are melted. The increase in temperature needed for the melting process is obtained by rubbing the two pieces to be welded. Pressure is applied to the moving piece in order to keep the parts to be assembled in contact during the welding process. This technology is suitable for welding thermoplastic materials with complex shapes or containing particular materials, offering a valid alternative. In some cases, it is a better option than ultrasound welding.

The electric motor, is controlled by a special device and provides the main rotary motion. Using the keyboard it is possible to program the welding cycle.
The rotation shaft is supported by bearings and features a particular geometric layout to make it possible to transform the rotary motion into vibration motion. This shaft has a groove where an insert is fastened with a screw. The dimensions of the groove are fixed, while those of the insert are variable and determine the vibration amplitude.
We make use of this technology in the production of our plastic material assembly machines,
The production of the vibration welders is undertaken entirely at the Sirius Electric factory in Vigevano.
The sales of our vibration welders are managed directly by our sales department. Our technical support is important and we collaborate with the client in the definition of the weld joint.

In relation to this technology, as for all the other solutions that we are offer, the sales procedures require close collaboration with the client, aimed at carefully  studying all the technological aspects in relation to thermoplastic materials and the geometrical shapes of the parts to be assembled using vibration welding.

Esempi di pezzi saldati a vibrazione.

Examples of vibration welded items.

There are various types of vibration welders, and they differ in terms of the movement generated:

  • Linear vibration welders, where the moving part is connected to the base by means of springs that are similar to bars. The movement is generated by two electromagnets.
  • Orbital vibration welders, the concept is similar to that of linear movement, but with three electromagnets, therefore with a false motor.
  • Circular vibration welders, where the movement is generated by an electric motor and the rotation of a shaft, with the possibility of generating eccentricity, and therefore a vibration.


As can be seen, as the result of the movement, the performance levels are totally different. In the case of linear vibration welding, there are zones of no velocity corresponding to the inversion of the linear motion direction.  The energy generated is at its maximum when the velocity in null, and null when the velocity is at its maximum.
In orbital vibration welding, the performance of the system is greater. Tangential velocity has a more constant progress which means that the sinusoidal progress of the system is less marked.
In circular vibration welding, the progress is constant.
Movement without any changes in direction, makes it possible to transmit the melt energy in a constant manner.
The energy is not subject to any fluctuation so that the material melting is rapid and uniform on the contact surfaces between the parts.

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Sirius Electric S.r.l.
Via Mastronardi 6/b
27029 Vigevano (PV) Italy
Tel. +39 0381 32.56.10 - 31.25.22
Fax +39 0381 23.987
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