Journal of Welding Science

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Zotero  

Taheri M, Azimiroeen G. A novel approach to enhance the joints performance of AA1100 joints fabricated by friction stir welding (FSW). JWSTI 2026; 12 (1) :79-88
URL: http://jwsti.iut.ac.ir/article-1-536-en.html

In this study, the effect of an additional pass using a pinless tool on the microstructure and mechanical properties of friction stir welding (FSW) AA1100 butt joints was investigated. The microstructure was characterized using optical microscopy and scanning electron microscopy (SEM), while the mechanical properties were evaluated by tensile and Vickers microhardness tests. The results indicated that applying additional passes led to grain refinement of the microstructure and a reduction in grain size to approximately 1 µm in the stir zone. Moreover, the microhardness in the upper stir zone increased from about 30 HV in the initial joint to nearly 55 HV in the processed sample. Tensile test results also revealed an improvement in mechanical properties, with the ultimate tensile strength (UTS) increasing from 86 MPa to 101 MPa, corresponding to an enhancement of approximately 17%. This improvement was mainly attributed to grain refinement and the increased grain boundary density.