Mechanical Properties and Corrosion Rate of Friction Stir Mg-Alloys AZ31B-H24 Welded Joints Produced by a Triangle Pin at Different Tool Rotation Speeds

In the present work, mechanical properties and corrosion resistance of friction stir AZ31B-H24 magnesium alloy welded joints with variation in tool rotation speeds of 910, 1500 and 2280 rpm have been investigated. Friction stir welding (FSW) processes were performed using a tool having a triangular pin which moved along a joining line at a speed of 60 mm/min. After welding, various number of tests were carried out including macro- and microstructure observation, Vickers microhardness measurements, tensile tests and corrosion measurement in 3.5 solution using Tafel technique. Results showed that high strength of the FSW welded joint, typically 212.2 MPa was obtained at a tool rotation speed of 2280 rpm resulting in a welding efficiency of 86.3. Similar to the results of tensile tests, it was found that the FSW joint with excellent corrosion resistance was produced at the tool rotation speed of 2280 rpm with the corrosion rate of 0.015 mm/year. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.