Microhardness, Tensile and Microstructural Characteristics of Friction Stir Welding of Distinct Materials: AA2024-T351/7075-T651

Abstract

Solid-state friction stir welding is utilized to combine two materials in many critical applications in industrial sectors. The heat-treatable aluminium alloys AA2024-T351/7075-T651 are extensively applied in the automotive, aerospace and transportation sectors. Aluminium alloys are more robust with less density, more impact resistant, harder and have better corrosion and fatigue resistance. The current study is to weld the dissimilar materials of Al alloy by utilizing various welding conditions. The tool rotation at low, medium and high levels (800, 1000 and 1200) rpm; the welding speed varies 20, 40 and 60 mm/min and the plunge depth vary 0.2, 03 and 0.4 mm, respectively. Tensile testing and microhardness were used to assess the mechanical qualities, while optical microscopy was used to examine the microstructure. As a result of increased heat input and dynamic recrystallization in the deformed zone, the microstructure investigation result shows the appearance of coarsening grains. Moreover, the tensile strength increases with the increasing rotational, welding speed and plunge depth of the FSW process.