Plastic Welding Technology - Axess Ultrasonics

Plastic Welding Technology

Welding Techniques

Ultrasonic Assembly

Ultrasonic welding is an assembly process for the mass production of a very wide range of quality products. It is mainly used for the welding of thermoplastic resins of all types and shapes in a great range of industries. Ultrasonic Plastic Welding System converts 50Hz electric input to 15/20/30/KHz electric energy, which transforms this electrical energy into mechanical vibratory energy. This vibratory energy is delivered to the work piece through an acoustic tool/horn to generate localized heat under pressure. Frictional heat cause part interface to melt and fuse, creating a strong molecular bond.

Near field welding

Far field welding

Staking/Riveting

Embedding

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Hot-Plate Welding

Hot plate is a welding procedure, in which the joining faces of the moulded parts to be welded are adequately heated using an electrically heated hot plate through contact (heat conduction) or radiation and subsequently welded under pressure. It is a welding procedure used very often in industrial series production. Apart from the welding of three dimensional joining geometries, it is particularly the flexible automation levels and the large product range of plastics that are processed with this procedure. Hot plate welding is designated as a multi-stage procedure, as the heating and the joining procedure run separately at different times.

Hot plate welding utilizes a temperature controlled heat platen assembly, which is introduced between the two parts to be assembled. All items are brought together, and the melting cycle is started. The parts are melted for a pre-set time to displace enough plastic for surface preparation and to properly heat the subsurface of the joint area. The parts are then separated, and the heat platen is withdrawn. Both halves of the holding fixtures are brought together against stops for the proper amount of seal time and seal depth.

Spin Welding

Spin welding is a process that joins circular thermoplastic parts by bringing the part interfaces together, under pressure, with a circular, spinning motion. One part is held stationary in a fixture, while the other is rotated against it under pressure. The frictional heat that is generated causes the part interfaces to melt and fuse together, creating a strong, hermetic seal.

Spin welding is a process that joins circular thermoplastic parts by bringing the part interfaces together, under pressure, with a circular, spinning motion. One part is held stationary in a fixture, while the other is rotated against it under pressure. The frictional heat that is generated causes the part interfaces to melt and fuse together, creating a strong, hermetic seal.

Vibration Welding

In vibration welding, two plastic parts are in frictional contact with each other with a certain frequency, amplitude and pressure. As a result of the friction between both parts heat is generated which causes the polymer to melt at the interface. Due to pressure, the molten polymer flows out of the weld-zone giving rise to flash, see. After the vibration has stopped the layer of polymer melt solidifies and a joint is generated.

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