Abstract
This paper presents the analysis of the friction stir-processed aluminium alloy 5083-H111 gas tungsten arc-welded and friction stir-welded joints. The comparative analysis was performed on the processed and unprocessed gas tungsten arc-welded and friction stir-welded joints of similar aluminium alloy 5083-H111. The results showed a clear distinction between the friction stir processed joints and unprocessed joints. There is a good correlation observed between the microstructural results and the tensile results. Ultrafine grain sizes of 4.62 μm and 7.177 μm were observed on the microstructure of the friction stir-processed friction stir-welded and gas tungsten arc-welded joints. The ultimate tensile strength for friction stir-welded and gas tungsten arc-welded before friction stir processing was 153.75 and 262.083 MPa, respectively. The ultimate tensile strength for friction stir processed friction stir-welded joint was 303.153 MPa and gas tungsten arc-welded joints one was 249.917 MPa. The microhardness values for the unprocessed friction stir-welded and gas tungsten arc-welded joints were both approximately 87 HV, while those of the friction stir-processed ones were 86.5 and 86 HV, respectively. The application of friction stir processing transformed the gas tungsten arc morphology from brittle to ductile dimples and reduced the ductile dimple size of the unprocessed friction stir-welded joints from the range of 4.90–38.33 μm to 3.35–15.59 μm.
Highlights
Aluminium is known to be light in weight and a good corrosion-resistant material. ese features have brought attention towards this material such that it became the best material suitable for building the aircraft structures, ship structures, and automotive components. e other benefit of using aluminium is that its weight lightness contributes to the reduction of power consumption [3]. e 5083-H111 aluminium alloy (AA) from the wrought alloy 5xxx series was selected to be utilized in this paper
Welding is divided into different types, i.e., gas metal arc welding (GMAW), gas tungsten arc welding (GTAW), friction welding (FW), friction stir welding (FSW), and laser welding
Advances in Materials Science and Engineering e GTAW method has been the preferred method for welding aluminium alloys due to its cleanliness, but recently, the preference has shifted towards FSW. is shift is due to the fact that FSW is clean and does not produce any gas to the atmosphere, considered as green technology as well as fusion welding techniques such as arc welding result in several problems, namely, porosity formation, loss of strength, and cracking in high strength Al-alloys [5,6,7,8,9]
Summary
Cape Peninsula University of Technology, Mechanical Engineering Department, 7535 Cape Town, South Africa. Is paper presents the analysis of the friction stir-processed aluminium alloy 5083-H111 gas tungsten arc-welded and friction stir-welded joints. E comparative analysis was performed on the processed and unprocessed gas tungsten arc-welded and friction stir-welded joints of similar aluminium alloy 5083-H111. Ultrafine grain sizes of 4.62 μm and 7.177 μm were observed on the microstructure of the friction stir-processed friction stir-welded and gas tungsten arc-welded joints. SSM 356 aluminium alloy was used to study the impact of welding and rotational speeds towards the mechanical properties of this material [31]. Is paper reports the analysis of the mechanical properties of the processed friction stir-welded (FSWed) and gas tungsten arc-welded (GTAWed) AA5083-H111 joints. All the welds produced by GTAW and FSW techniques were later friction stir processed. (e) Figure 1: (a, b) Tool dimensions (in mm), (c) FSW/P Tool, (d) FSW joint, and (e) GTAWed plate
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