Abstract
The strength of the welded joint obtained by solid state stir welding process was found to be improved as compared to fusion welding process. The deposition of reinforcements during friction stir welding process can further enhance the strength of the welded joint by locking the movement of grain boundaries. In the present study, the aluminium alloys AA2024 and AA7075 were welded effectively by depositing the multi-walled carbon nanotubes in to the stir zone. The mechanical properties and microstructures were studied by varying the traverse speed at constant rotational speed. The results show that rotating tool pin stirring action and heat input play an important role in controlling the grain size. The carbon nanotubes were found to be distributed uniformly at a welding speed (traverse speed) of 80mm/min. This enhanced the mechanical properties of the welded joint. The microstructure and Electron dispersive X-ray analysis (EDX) studies indicate that the deposition of carbon nanotubes in the stir zone was influenced by the traverse speed.
Highlights
IntroductionLim et al.[12] reported the synthesis of multi-walled CNT reinforced aluminium alloy composite with a groove of 0.3depth and 2.3mm width by friction stir processing, in which the hardness of the joint was improved
Friction Stir Welding (FSW) is an efficient method for joining nonferrous metals which was invented by The Welding Institute (TWI), in the year 1991 [1]
The weld quality and weld pool geometry are observed to be effected by process parameters during friction stir welding process
Summary
Lim et al.[12] reported the synthesis of multi-walled CNT reinforced aluminium alloy composite with a groove of 0.3depth and 2.3mm width by friction stir processing, in which the hardness of the joint was improved. Abnar et al [17] investigated the friction stir welding of AA3003-H18 aluminium alloy by depositing the reinforcements in the stir zone He reported that Cu and premixed Al-Cu powder were inserted between the two metals without making groove. The present study focuses on the effect of traverse speed on microstructure and mechanical properties due to the deposition of multi-walled carbon nanotubes on fricton stir welded dissimilar aluminium alloys AA2024-T3 and AA7075-T6
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