Thermoplastic welding methods are reviewed

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source：time：2019-05-06 18:03:48ctr：

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Plastics not only play an important role in People's Daily necessities, but also are widely used in various sectors of national economy, military industry and cutting-edge science and technology sectors. Plastics can replace traditional materials such as glass, ceramics, wood, metal and natural fibers. With the development of science and technology, high performance materials such as super vinyl LLDPE resin and vinyl styrene copolymer have been widely used in industrial production. Engineering plastics and their composites have broad application prospects.
Plastics can be divided into two categories: thermosetting plastics and thermoplastics. Compared with thermosetting plastics, thermoplastics have a series of advantages, such as good toughness, easy processing, high temperature performance, long life and reusable. In addition, resin matrix composites are widely used in many industries because of their excellent comprehensive characteristics, designability and easy processing.
With the increasing application of thermoplastics and composites, the processing of plastic profiles or components, namely secondary processing, has become an increasingly concerned problem, rapid and reliable connection method has become the pursuit of people. The common bonding methods of thermoplastics and their composites in engineering mainly include mechanical bonding, bonding and heating bonding, etc., among which the methods of plastic welding mainly include thermal gas welding, hot plate welding, friction welding, vibration welding and ultrasonic welding. Some new welding methods are also developing rapidly, such as microwave welding, infrared welding, laser welding and welding using focused solar energy. Among them, ultrasonic welding with its high welding efficiency, heat output can be accurately controlled, usually do not need to fill solder, easy to realize automation and good welding quality and other advantages, become one of the ideal connection methods of thermoplastics and composite materials.

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