Theoretical Knowledge Of Ultrasonic Plastic Welding Machine

Theoretical Knowledge Of Ultrasonic Plastic Welding Machine

Date:Oct 26, 2020

Theoretical knowledge of ultrasonic plastic welding machine

How does ultrasonic welding work?

    The principle of ultrasonic welding is to convert 50/60 Hz current into 15, 20, 30 or 40 kHz electrical energy through an ultrasonic generator. The converted high-frequency electric energy is again converted into mechanical motion of the same frequency through the transducer, and then the mechanical motion is transmitted to the welding head through a set of amplitude modulator devices that can change the amplitude. The welding head transmits the received vibration energy to the joint of the workpiece to be welded. In this area, vibration energy is converted into heat energy through friction, thereby melting the plastic. Ultrasound can be used not only to weld rigid thermoplastics, but also to process fabrics and films.

    The main components of the ultrasonic welding system include ultrasonic generator, transducer/amplifier/triple welding head, mold and frame


How does linear vibration friction work?

    Linear vibration friction welding uses frictional heat generated on the contact surface of two workpieces to melt plastic. The thermal energy comes from the reciprocating movement of the workpiece on another surface with a certain displacement or amplitude under a certain pressure. Once the desired degree of welding is reached, the vibration will stop while still applying a certain amount of pressure to the two workpieces to cool and solidify the newly welded parts, thereby forming a tight bond.


How does rail vibration friction work?

    Orbital vibration friction welding is a method of welding using frictional heat energy. When performing orbital vibration friction welding, the upper workpiece performs orbital motion in all directions at a fixed speed-circular motion. Movement generates heat, which causes the welded part of the two plastic parts to reach a melting point. Once the plastic starts to melt, the movement will stop, and the welded parts of the two workpieces will solidify and be firmly joined together. The smaller clamping force will cause the workpiece to produce minimal deformation, and the workpiece with a diameter of less than 10 inches can be welded by orbital vibration friction.



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