Process optimization in the self-reacting friction stir welding of aluminum 6061-T6 |
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| Authors: | Jr" target="_blank">Luis TruebaJr Monica A Torres Lucie B Johannes Daniel Rybicki |
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| Affiliation: | 1.Mechanical Engineering,University of Texas of the Permian Basin,Odessa,USA;2.Department of Metallurgical and Materials Engineering,The University of Texas at El Paso,El Paso,USA;3.Materials and Processes Branch,NASA Johnson Space Center,Houston,USA |
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| Abstract: | Self-reacting friction stir welding (SR-FSW), also called bobbin-tool friction stir welding (BT-FSW), is a solid state welding process similar to friction stir welding (FSW) except that the tool has two opposing shoulders instead of the shoulder and a backing plate found in FSW. The tool configuration results in greater heat input and a symmetrical weld macrostructure. A significant amount of information has been published in the literature concerning traditional FSW while little has been published about SR-FSW. An optimization experiment was performed using a factorial design to evaluate the effect of process parameters on the weld temperature, surface and internal quality, and mechanical properties of self-reacting friction stir welded aluminum alloy 6061-T6 butt joints. The parameters evaluated were tool rotational speed, traverse speed, and tool plunge force. A correlation between weld temperature, defect formation (specifically galling and void formation), and mechanical properties was found. Optimum parameters were determined for the welding of 8-mm-thick 6061-T6 plate. |
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