Effect of Surface Treatment on Strength Properties of Aluminum/CFRTP Spot Joining

Abstract

In order to realize multi-material body, we are conducting researches on joining of aluminum and carbon fiber reinforced thermoplastic resin by using friction stir spot welding. In this report, the effects of aluminum surface treatment on strength properties were investigated by conducting shear tensile strength tests, fatigue tests, constant temperature and humidity tests, and thermal shock tests. As a result of comparative evaluation of two types of aluminum surface treatment for the purpose of improving chemical bond strength and giving anchor effect, both types showed a tendency to improve strength properties and reliability, and reduce variation, compared to the non-treatment material. Although the adhesiveness derived from the resin matrix components varies depending on the material, it is possible to improve robustness by using it in combination with aluminum surface treatment when using this joining process.