This guide details the ultrasonic equipment and the processes for welding thermoplastic parts. It also describes staking@ swaging@ insertion@ forming@ degating@ cutting@ and trimming. Included are discussions on joint and part design@ testing@ and process optimization. The information provided should be sufficient to enable the reader to understand the processes and select a suitable method. Safety and health issues and concerns are beyond the scope of this standard and therefore are not fully addressed herein (see 1.8). Safety and health information is available from other sources@ including@ but not limited to@ ANSI Z49.1@ Safety in Welding@ Cutting@ and Allied Processes and applicable federal and state regulations. Information on welding procedure and performance qualification for thermoplastics is available in AWS B2.4@ Specification for Welding Procedure and Performance Qualification for Thermoplastics.