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