1. N.T. Kumbhar and G.K. Dev, “Friction stir welding of aluminium alloy”, barc newsletter, issue no. 321, july-august 2011.
2. Joon Tae Yoo, Jong Hoon Yoon, Kyung Ju Min and Ho sung Lee, “Effect of friction stir welding process parameter on mechanical properties and Micro structure of Al-Li alloy”, 2nd int. materials, industrial and manufacturing egg. conference, 2015.
3. Dong woo kim, Myeong-Woo Cho, Tae-Il Seo and Eung-Sug Lee, “Application of Design of Experiment Method for Thrust Force Minimization in Step-feed Micro Drilling”, published in january 2008. ugur esme (2009), “application of taguchi methods for optimization of resistance spot welding process,” mersin university, tarsus technical education, the arabian journal for science and engineering, vol. 34, 2009.
4. N A Husain, H H Khodaparast, A Snaylam, S James, G Dearden, and H Ouyang, department of engineering, university of liverpool, liverpoo L, uk the manuscript was received on 16 june 2009 and was accepted after revision for publication on 2 october 2009.
5. M. Mehta, G.M. Reddy and A.V. Rao, “Numerical modeling of friction stir welding using the tools with polygonal pins”, defense technology, 2015.