In this paper, the authors present the results of a wide experimental campaign on aeronautical T-shaped parts of industrial interest characterized by dissimilar materials for the skin and stringer. The friction stir welding process engineering was developed with the aim to determine the specific process parameters determining the soundness on the obtained T-parts both from the metallurgical and mechanical point of view. Furthermore, the performance of the obtained T-joints was investigated. On the basis of the obtained results, the following conclusions can be drawn: The FSW (friction stir welding) of T-joints requires a large amount of heat input due to the necessary forging action aimed to fulfill the joint fillets. In this way, tools characterized by large shoulder diameters are required. Such conclusion is supported by several results in the literature assessing that, in FSW, the largest amount of heat is due to the frictional forces at work which decays into heat at the tool shoulder-workpiece interface. Furthermore, even if in the aeronautical and aerospace industries coated blanks are often required in order to improve corrosion resistance, coating layers negatively interact with the material flow during FSW giving rise to macro and micro defects and resulting as a consequence in poor mechanical performances. In the design of the processes, once an effective geometry of the tool is found out, in order to improve the industrial productivity of FSW, a slight increase of the tool shoulder diameter permits to obtain sound results even with larger values of the tool feed rate. Further assessments of the present work will include investigations on the effects of the tool plunge on the skin thickness and, what is more, on the fatigue resistance of the joints.
On the FSW of AA2024-T4 and AA7075-T6 T-joints: an industrial case study
International Journal of Advanced Manufacturing Technology ; 48 , 9-12 ; 1149-1157
2010
9 Seiten, 3 Bilder, 15 Tabellen, 20 Quellen
Article (Journal)
English
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