Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2019 - September 11, 2019
This study aims to development the ultrasonic spot welding process of CFRTP using flat energy director and carbon fiber reinforced energy director. The materials used for spot welding are woven-CF/PPS laminates and energy director consisting of PPS polymer and spread carbon fiber. It is expected to improve the ultrasonic heating efficiency and the joining strength by using continuous carbon fiber reinforced energy director. The ultrasonic oscillator for ultrasonic spot welding has an oscillation frequency of 40 kHz and a maximum output of 600 W. The welding load and displacement of ultrasonic horn during the ultrasonic spot welding were precisely controlled using a servo press unit. The effects of ultrasonic power, pressing force, welding time and types of energy director on ultrasonic welding behavior and joining strength were investigated to obtain the proper welding conditions. The temperature of the joining part during ultrasonic welding was measured by a ultrafine thermocouples. From the experimental results, it was revealed that the volume fraction of carbon fiber in the energy director was significantly affects the ultrasonic welding behavior. From the result of single lap shear strength test, it was found that there was proper fiber volume fraction in energy director to increase the joining strength.
