Abstract
Heat produced due to friction and plastic deformation is considered to be the sources of energy for friction stir spot welding process. This paper propounds that plastic deformation plays a prominent role in heat generation and subsequent joining as compared to friction, contrary to what the name friction stir spot welding (FSSW) suggests. The effect of lubrication between the tool shoulder and the workpiece on the energy required for the welding process has been studied. It is found that due to lubrication the coefficient of friction decreased, resulting in a significantly lower torque and a decrease in plunge force. This resulted in successful welding using lower energy without reduction in joint strength as confirmed by peel and lap shear tests. Finite element (FE) simulation for the lubricated and unlubricated FSSW conditions using DEFORM-3D showed a good agreement with the experimental torque and plunge force after adjusting the friction factor. Temperature distribution from FE simulations, with and without lubricant, is compared which revealed the more important role of plastic deformation as compared to friction in governing peak temperature produced at the pin vicinity.
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Bhardwaj, N., Ganesh Narayanan, R., Dixit, U.S. (2020). Effect of Lubrication on Energy Requirement and Joint Properties During FSSW of AA5052-H32 Aluminium Alloy. In: Sharma, V., Dixit, U., Sørby, K., Bhardwaj, A., Trehan, R. (eds) Manufacturing Engineering . Lecture Notes on Multidisciplinary Industrial Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-4619-8_24
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