The Influence of Tool Shape on Plastic Metal Flow, Microstructure and Properties of Friction Stir Welded 2024 Aluminum Alloy Joints

In this paper, the effect of different shapes tool pin on plastic flow 2024-T6 aluminum alloy during friction stir welding was studied. order to observe materials more clearly, we chose method dissimilar materials, considering corrosive characteristics alloys made when exposed same liquid. By studying and comparing temperature field, macro microstructure, microhardness tensile properties welded joints, results indicated that metal in weld nugget zone (WNZ) mainly came from base advancing side, thread being driving force downward movement FSW metal. The deep groove had strongest ability drive downward. conical cam stirring best fluidity. macroscopic morphology, mechanical fracture morphology joints were analyzed, showed all could form an excellent union, with onion ring pattern appearing cross-section. minimum grain size WNZ formed by head 7~12 μm; hardness least at junction heat affected (HAZ) thermo-mechanically (TMAZ). However, point higher than other heads; strength 80% BM, maximum joint 364.27 MPa, accounting for 86.73% (BM). elongation after break 14.95%. Tensile analysis fractured fracture.