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2021. Effect of Pre-hole Diameter on Bushing Dimensions for Friction Drilling Process of A6063-T6 Aluminum Alloy. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 39, 1 (Oct. 2021), 373–387. DOI:https://doi.org/10.55562/jrucs.v39i1.218.