![]() ![]() Corrosion investigations show an influence of the ultrasound power on the corrosion properties of EN AC-48000/AZ91 joints which is attributed to a changed aluminum content in the nugget region. Regarding the tensile strength of the joints the power ultrasound leads to increased joint strengths for EN AC-48000/AZ91 joints compared to a decrease for EN AW-6061/DP600 joints. Scanning electron microcopy proves differences in the thickness of continuous intermetallic layers for the aluminum/steel joints realized with and without power ultrasound. Light microscopic analysis and nondestructive testing of the joints using x-ray and high frequency ultrasound show different morphologies of the nugget for the aluminum/magnesium joints as well as differences in the amount and size of steel particles in the nugget of aluminum/steel joints. ![]() ![]() Therefore, conventional friction stir welding was continuously compared to ultrasound enhanced friction stir welding. ![]() The present work investigates the influence of additionally transmitted power ultrasound during the friction stir welding on the joint properties of EN AC-48000/AZ91 and EN AW-6061/DP600. Such hybrid joints are of great interest regarding lightweight efforts in different industrial fields like the transportation area. Friction stir welding as a solid-state joining method with its comparatively low process temperatures is suitable for joining dissimilar materials like aluminum/magnesium or aluminum/steel. ![]()
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