Abstract
Friction Stir Welding (FSW) is a feasible welding process to join dissimilar materials due to its solid-state nature. In this study the FSW of 6061-T6 aluminum with pure Cu plates was performed with the objective of evaluating the effects of the FSW parameters on the microstructure and electrical properties. The processing parameters (rotational and traverse speeds) were established to reduce the common defects in the friction-stir welding process. Therefore, the obtained results validated the better mechanical properties and a smaller increase of the electrical resistivity. The rotational speeds used were of 1000, 1150, and 1300 rpm, and the traverse speeds of 20, 40, and 60 mm/min, with the purpose of varying the heat input of the process. The microstructural characterization revealed the presence of a mixture of aluminum and copper into the weld zone, along with copper particles and the formation of intermetallic compounds. It was found that the electrical resistivity of the joints ranged from 0.029 to 0.036 μΩ. The highest electrical resistivity values were obtained at the lowest traverse speed (20 mm/min) and the lowest resistivity values were obtained at highest traverse speed (60 mm/min).
Highlights
The dissimilar joint is of great interest due to the economic and technological advantages that it represents
Stir Welding (FSW) is a solid-state welding process, where similar and dissimilar materials can be joined through a mixture of heat created by friction and mechanical stirring of the materials in the joint line, using only a non-consumable rotatory tool between the plates
A heat input change was performed in Friction Stir Welding (FSW) using different parameters, tool rotational speed and traverse speed, which ranged from 1000 to 1300 rpm and from 20 to
Summary
The dissimilar joint is of great interest due to the economic and technological advantages that it represents. A high rotational speed forms a large quantity of IMCs, due to the increased heat input that is generated, and produces great stirring, which is responsible for separating the particles of the different base materials. With a high heat input, the material is greatly softened, resulting in turbulent flow of the plasticized material Taking this into account, it is important to study the combination between the rotational and traverse speeds, controlled by heat input, and IMCs formation in FSW of dissimilar materials. The FSW of 6061-T6 Al plates with pure Cu plates was carried out effect on the microstructure and the formation and growth of IMCs that ying the parameters of the process to analyze the heat input ratio during the process and impact on the electrical propertiesand of the their effect on the microstructure thejoint. Formation and growth of IMCs that impact on the electrical properties of the joint
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