What is the principal of ultrasonic spot welder work?

April 22, 2022
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With the rapid development of the material industry, people are paying more and more attention to the application of lightweight, low-friction, corrosion-resistant, and easy-to-process plastic and metal composite materials. Various plastic products have penetrated into various fields of people's daily life, and also widely It is used in aviation industry, shipping, automobile, electrical appliances, packaging, toys, electronics, textile and other industries. However, due to the limitation of injection molding process and other factors, a considerable number of plastic products with complex shapes cannot be injection molded at one time, which requires adhesive use. Years of plastic bonding and heat sealing processes are quite backward, not only inefficient, but also toxic to a certain extent, causing problems such as environmental pollution and labor protection. Traditional processes can no longer meet the needs of the development of the modern plastics industry.

Therefore, ultrasonic plastic welding is a new type of plastic processing technology. When welding plastic products, ultrasonic welding does not add any adhesives, fillers or solvents. It has the advantages of high efficiency, high quality, beautiful appearance and energy saving. Due to the advantages of high speed, high welding strength and high production efficiency, ultrasonic welding technology is more and more widely used. Not all plastics can be ultrasonically welded. Most materials suitable for ultrasonic welding are thermoplastic. It is a high molecular polymer that softens and flows when heated, solidifies when cold, and does not repeatedly change its chemical structure. Thermosets cannot be ultrasonically welded.


The principle of ultrasonic plastic welding is to convert the high-voltage and high-frequency signals generated by the generator into high-frequency mechanical vibrations through the energy conversion system, and add them to the workpiece of plastic products, and increase the temperature transmitted to the interface through the friction between the workpieces. The surface of the workpiece When the temperature reaches the melting point of the workpiece itself, the interface of the workpiece will melt rapidly. When the vibration stops and the workpiece is cooled and formed under a certain pressure, the gap between the interfaces can be filled to achieve a perfect welding effect.