Welding Radio frequency

RF (radio frequency) welding Utilizes specific bands of radio frequency waves which are directed through specially constructed tooling to form localized melting/joining of certain dielectric thermoplastic materials. Can be used to form hermetic seals. Also known as high frequency or dielectric welding. 

Radio-frequency welding (dielectric welding, high-frequency welding) n. 

Other radiations occxu as electromagnetic radiations where the transmitter emits electromagnetic waves that act directly on the molecules of a solid or liquid increasing their energy and hence raising the temperature of the material. Microwave ovens and radio frequency welding equipment emit radiations of this sort. 

In radio-frequency welding, thermoplastic parts to be welded are placed underpressure between two electrodes. Energy, usually 27 MHz, is applied to the electrodes, and the resulting alternating current induces a rapidly reversing (several million times per second) electric field around the parts. Polar molecules in an electric field tend to orient in the field direction, so that... 

Table 8.1 shows that PE is difficult to bond, paint, and plate high-density PE (HOPE) is easy to machine while low-density PE (LDPE) is not. Suitable welding techniques for both types of PE are friction, vibration, hot gas, and hot plate welding. Ultrasonic welding is difficult, especially for LDPE, while radio frequency welding is impossible for both types. 

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