Abstract
In the present work, Aluminium alloy sheets graded as Al6061 having 6 mm thickness were TIG welded as a butt joint. In order to modify the microstructure, the joint of welded samples were subjected to friction stir processing (FSP). The effect of FSP on the microstructure in the welded and heat affected region (HAZ) was characterized by optical microscopy. Further, the mechanical strength, hardness and fatigue life was determined through mechanical test, hardness test and fatigue test. The fatigue life tests were performed at constant amplitude loading by taking stress ratio equals to zero. It has been found that the FSP increases the tensile strength approximately 5–13% whereas hardness 5–10%. Similarly, there has been found approximately 30–60% improvement in fatigue strength. It is attributed that such kind of changes were found due to grain refinement in the welded region and its vicinity. Other reasons might be due to the modification in geometry of weld toe. It has been observed that the weld defects like porosity, hot cracking and lack of wetting have been also reduced.
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Bharti, A., Tripathi, H. (2019). Enhancement of Fatigue Life of TIG-Welded Joint by Friction Stir Processing. In: Chattopadhyay, J., Singh, R., Prakash, O. (eds) Renewable Energy and its Innovative Technologies. Springer, Singapore. https://doi.org/10.1007/978-981-13-2116-0_5
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DOI: https://doi.org/10.1007/978-981-13-2116-0_5
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