Several Principles Of Ultrasonic Welding
1. Principle of ultrasonic welding
Ultrasonic welding is to transmit high-frequency vibration waves to the surfaces of two objects to be welded, so that the surfaces of the two objects rub against each other to form fusion between the molecular layers.
The main components of the ultrasonic welding system include: ultrasonic generator / transducer / horn / welding head triplet / mold and frame.
Ultrasonic welding is to convert 50/60Hz current into 15.20.30 or 40KHz electric energy through an ultrasonic generator, and the converted high-frequency electric energy is converted into mechanical motion of the same frequency again by the transducer, and then the mechanical motion is passed through a set of adjustable amplitude. The horn device is transmitted to the welding head, and the welding head transmits the received vibration energy to the joint part of the workpiece to be welded. In this area, the vibration energy is converted into heat energy by friction and melts the area of the part to be welded.
Ultrasonic can be used not only to weld metals, hard thermoplastics, but also to process fabrics and films.
2. Principle of ultrasonic plastic welding
When ultrasonic waves act on the thermoplastic contact surface, tens of thousands of high-frequency vibrations are generated per second. This high-frequency vibration that reaches a certain amplitude transmits ultrasonic energy to the welding area through the upper weldment. Since the weld area is the interface of two welds, localized high temperatures are generated. Due to the poor thermal conductivity of the plastic, it cannot be dissipated in time, and it gathers in the welding area, causing the contact surface of the two plastics to melt rapidly. With a certain pressure, ultrasonic welding can make it fused into one. When the ultrasonic wave stops working, let the pressure continue for a few seconds to make it solidify and form a strong molecular chain to achieve the purpose of welding, and the welding strength can be close to the strength of the raw materials.
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