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On the basis of an analysis of the temperature field in a thermoplastic placed in the corresponding processing equipment, an examination is made of the problem of determining the optimum regime parameters for the highfrequency welding of plastics. It is shown that the optimum process parameters are those ensuring a comparatively narrow depth of the heat-affected zone. The optimum depth of the heat-affected zone is determined for cases of the high-frequency welding of specimens of polyamide and polyvinyl chloride.