Three mm thick plates of commercial pure copper were welded via friction stir welding method using a floating bobbin tool. The effect of different process variables such as the tool transverse speed and the tool rotation speed were examined in order to create a weld with the desired properties. A defect-free weld was obtained at a rotation speed of 1400 rpm and a transverse speed of 18 mm/min w...

The technically pure copper is being replaced by aluminium as conductive material in electrical transformers for power systems. This evolution brings new manufacturing challenges. One major difficulty is the limited weld ability and non-acceptable residual deformations of the aluminium, when welded by fusion arc welding processes. The Friction Stir Welding (FSW) was selected for evaluation cons...

Abstract The main indicator of the quality cotton harvesting machine is completeness collecting grown crop into bin, which usually 3-4% lower than spindles. This because remover vertical-spindle machines does not fully remove bobbins from Part wound on spindle carried away working zone without being removed. phenomenon called “cotton carry-over”. According to previous authors, “Carry-over” reac...