RF welding (also known as High Frequency (HF) welding or Dielectric welding) is a method of joining thin sheets of polar thermoplastic material together. It uses high frequency (13 to 100 MHz) electromagnetic energy to fuse the materials. A rapidly alternating electric field is set up between two metal welding bars. The electric field causes the polar molecules found in some thermoplastics to oscillate and orient themselves with respect to the field. The energy generated by this process causes a temperature increase which results in melting of the materials. Combined with applied pressure from clamping the welding bars, this causes a weld to form.
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