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Benzer kategorideki diğer ilanlar listelenmektedir.High-frequency ultrasonic acoustic vibrations is an industrial technique where it is locally applied to workpieces held together under pressure to create solid-state bonds. It is commonly used in joining plastics and metals, especially in joining different materials. In ultrasonic welding, there are no fasteners, nails, solder materials, or adhesives required to bond the materials together. When applied to metals, a notable feature of this method is that the temperature remains below the melting point of the respective materials. These machines are used for a wide range of applications. For joining complex injection-molded thermoplastic parts, ultrasonic welding equipment can be easily customized to match the exact properties of the parts being welded. When welding plastics, the joint surface of two pieces is specially designed to concentrate the melting process. One of the materials often has a knurled or rounded energy director that makes contact with the second plastic piece. The ultrasonic energy melts the point of contact between the parts, creating a bond.
Ultrasonics can also be used to weld metals, but typically limited to thin, malleable metals such as aluminum, copper, and nickel with small welds. Ultrasonics are not used to weld an automobile's chassis or bicycle parts together due to the necessary force levels. Ultrasonic welding of thermoplastics causes the local melting of the plastic due to the absorption of vibration energy along the weld joint. Welding in metals occurs due to the dispersion of surface oxides under high pressure and the local movements of materials. Despite the heating, it is not enough to melt the base materials. Ultrasonic welding can be used for both rigid and soft plastics, such as semi-crystalline plastics and metals. Understanding of ultrasonic welding has increased with research and testing. The availability of more sophisticated and cost-effective equipment and the increasing demand for plastics and electronic components have led to a growing knowledge of basic operations. However, various aspects of ultrasonic welding still require further research, such as correlating weld quality with process parameters. Ultrasonic welding continues to be a rapidly developing field.
The benefits of ultrasonic welding are that it is much faster than traditional adhesives or solvents. The curing time is very rapid, and there is no need for parts to remain in a fixture for long periods waiting for joints to dry or cure. Welding can be easily automated, providing clean and precise connections; the weld location is very clean and rarely requires any rework. The low thermal impact on the materials allows a greater number of materials to be welded together. Ultrasonic welding applications are wide-ranging and can be found in many sectors such as electronics and computing, automotive and aviation, medical and packaging. Whether two components can be ultrasonically welded or not is determined by their thickness. If they are too thick, this process will not join them. This is a major hindrance in welding metals. However, wires, microcircuit connections, metal sheets, foils, strips, and grids are often joined using ultrasonic welding. Ultrasonic welding is a very popular technique for bonding thermoplastics. Welding times are typically very fast, less than a second, and easily automated, without the need for ventilation systems to remove heat or exhaust. This type of welding is often used to create very small, very complex, or very sensitive assemblies compared to more common welding techniques.
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