A new friction stir welding based technique for corner fillet joints: Experimental and numerical study
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2010-04
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Friction stir welding (FSW) is an energy efficient and environmentally friendly (no fumes, noise, or sparks) welding process, during which the sheets are welded together in a solid-state joining process. FSW is mature for simple configurations but a significant lack of knowledge is found when dealing with different designs such as T-sections, corner welds and box sections. The present work explores the feasibility of producing corner fillet geometries using FSW. Although such a kind of geometry has traditionally been considered unfeasible for the process, it seems to have a great potential to be used for T-joint configurations, a recurrent design pattern in transport applications. A specific tool has been developed and a set of welds has been produced with it. The process has been analysed by both micro and macro observations and a dedicated numerical model tuned by comparison of the thermal histories experimentally measured by embedded thermocouples. According to the obtained results, the proposed model is able to represent a useful design tool for the process. Main problem pending to be solved is how to avoid the formation of a tunnel defect in the weld centre line due to a suck effect of the tool on the stirred material.
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Buffa , G , Fratini , L , Arregi , B & Penalva , M 2010 , ' A new friction stir welding based technique for corner fillet joints : Experimental and numerical study ' , International Journal of Material Forming , vol. 3 , no. SUPPL. 1 , pp. 1039-1042 . https://doi.org/10.1007/s12289-010-0948-0