Application of Taguchi approach to optimize friction stir welding parameters of polyethylene M.A. Rezgui, M. Ayadi, A. Cherouat, K. Hamrouni, A. Zghal and S. Bejaoui EPJ Web of Conferences, 6 (2010) 07003 Published online: 10 June 2010 DOI: 10.1051/epjconf/20100607003