Ultrasonic Welding of Caprolon B Centrifugal Pump Impellers

Based on the research of physico-mechanical characteristics of caprolon B, a thermoplastic polymeric material, a justification of the choice of the ultrasonic welding method for the production of centrifugal pump impellers is presented. An analysis of the existing methods of manufacturing centrifugal pump impellers is performed. The research of physico-mechanical properties of caprolon B under various operating conditions established the possibility of using it to manufacture centrifugal pump impellers. A weld joint can be obtained by shifting the high-temperature area to the interface realized through the V-shaped edge preparation. The application of the V-shaped preparation of welded edges leads to the primary heat generation at the interface caused by an increase in the level of dynamic stresses, and produces a high-quality welded joint. The results of mechanical and operational tests of the impellers manufactured using ultrasonic welding are given. A method of manufacturing impellers using rivet joints made by ultrasonic welding is proposed and investigated. The operational tests have shown that the centrifugal pump impellers produced using the proposed method meet the specified requirements. Acoustic parameters (amplitude, frequency) in the investigated range do not influence the joint strength but have an impact on increasing the process productivity. The increase in the welding static pressure also contributes to increased productivity due to the reduction in time required to warm up the welded rivet and, as a result, the whole product.

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