Effect of tool pin profiles on surface roughness of friction stir welded 2050-T84 Al-Cu-Li alloys. - KUMAR, SANJEEV; SETHI, DURJYODHAN; CHOUDHURY, SMRITY; DAS, RAHUL; SAHA, SUBHASH CHANDRA; ROY, BARNIK SAHA (Journal of Mines, Metals & Fuels, 2022)