Investigation of the Ultrasound Welded Aluminium Joint Microstructure

The ultrasound welding is a special welding process. Usually use in case of cold rolled sheets. The car industry electrical parts cases made by ultrasound welding. Requirement in case of these parts the electrical connectivity and this shield needs to be a Faraday cage. This technology use ultrasound and pressure to establish a welded joint. During the joining it can detect some heat from the high frequency sound affected friction. This is a very complex process. This technology combines the affects what it can detect during the friction welding, the diffusion welding and the cold pressure welding. This heat isn’t enough to melt the materials, but it can affect recrystallization of the used cold rolled metal [1, 2]. The grain size and geometry depend on the used parameters and the level of the used sheet shaping estate. The goal of this work to find the relationship between the welded joint grain size and the used parameters of the ultrasound welding.