Soldabilidad y análisis comparativo del comportamiento de la soldadura por fricción (FRW) y la soldadura por fricción-agitación (FSW) en los polímeros poliamida PA-66 y polietileno

Abstract

In the present work, the behavior of the welds made by friction welding and friction stir welding processes in high density polyethylene and PA-66 polyamide was studied and analyzed. The selection of parameters and tools was performed according to experimental tests, which helped to define under what conditions the welding can be carried out in these polymers. The welding process by friction stirring was the one that presented the greatest inconvenience, due to the difficulty of correctly defining the geometry of the tool and the revolutions of rotation of the milling machine, since in the case of the two polymers weld at revolutions lower than 1200 rpm does not reach a melting point, and if it exceeds 1800 rpm in the case of PA-66 polyamide it starts to become brittle in its weld seam. Polyethylene instead needs a longer contact time between the surfaces to increase its temperature and the temperature of tool, so it was chosen to weld the polyamide and high density polyethylene by making manual advances with the milling machine. In order determine the mechanical properties of the specimens, tensile tests, visual inspection, penetrating inks and Differential Scanning Calorimetry (DSC) were performed. When the results, were obtained, the best samples were chosen to make the comparison between these two processes.