This and the next image are from:
Rui Miguel Ferreira Paulo, “Modelling of friction stir welding processes and their influence on the structural behaviour of aluminium stiffened panels”, Ph.D dissertation, Dept. of Mechanical Engineering, University of Aveiro, 2015
Citation Nos. 1 and 2 are:
 Epicos site, <http://www.epicos.com/>, (June, 2015).
 Technology page on Englishrussia site, <http://englishrussia.com/>, (June, 2015).
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