%0 conference paper %@ %A de Oliveira, P.H.F.,Amancio, S.,dos Santos, J.F.,Hage, E. Jr. %D 2011 %J Proceedings of Annual Conference of the Society of Plastics Engineers, ANTEC 2011 %N %P 1821-1825 %T Influence of the Tool Material on the Microstructure and Mechanical Properties of PMMA Lap Joints Welded by Friction Spot %U %X