In our daily life, we use a large amount of plastic products, including bottles, bags, stationary, home appliances, etc. I am always wondering how all these plastic items are produced, by what kinds of technique and procedures. Among those complicate manufacturing process, welding separate parts together is a crucial steps. Of course, you can joint parts by glue or fasteners. You can even use flame to welding the parts. However, they are old ways. Ultrasonic bonding arises as a new and effective way for binding dissimilar materials. It is an industrial technique whereby high-frequency ultrasonic acoustic vibrations are locally applied to workpieces being held together under pressure to create a solid-state weld. It is commonly used for plastics. In ultrasonic welding, there are no connective bolts, nails, soldering materials, or adhesives necessary to bind the materials together.
The applications of ultrasonic welding are extensive and are found in many industries including electrical and computer, automotive and aerospace, medical, and packaging. Whether two items can be ultrasonically welded is determined by their thickness. If they are too thick this process will not join them. This is the main obstacle in the welding of metals. However, wires, microcircuit connections, sheet metal, foils, ribbons and meshes are often joined using ultrasonic welder. Ultrasonic welding technique is a very popular technique for bonding thermoplastics. It is fast and easily automated with weld times often below one second and there is no ventilation system required to remove heat or exhaust. This type of welding is often used to build assemblies that are too small, too complex, or too delicate for more common welding techniques.
