Ultrasonic Welding Process for Medical Devices

This technical report investigates the ultrasonic welding of thermoplastics, focusing on the capabilities of servo-driven welders to enhance weld strength and reliability for medical device applications. The study builds on previous research, detailing experiments that varied weld velocity to optimize the joining process while minimizing weld flash and ensuring compliance with stringent medical industry standards. The report outlines the methodology, including the use of Dukane's servo ultrasonic welder and the parameters set for experimentation. Results indicate that a linearly increasing weld velocity profile correlates with stronger welds, as evidenced by tensile strength tests and microscopic analysis of the weld zones. The findings reveal that a controlled weld process can achieve robust joints without excessive collapse, highlighting the importance of precise melt control in achieving desired weld characteristics. This research contributes to the understanding of ultrasonic welding processes and their application in critical medical device manufacturing.