A Study on Microstructure of AA2219 Friction Stir Welded Joint (original) (raw)
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Journal of Mines, Metals and Fuels
A high strength of aluminium alloy is entitled AA2219. It has been majorly used in aircraft and the construction of cryogenic fuel tanks in missiles. A novel solid-state joining technique named as friction stir welding (FSW) has been proven to be capable of joining advanced materials like AA2219 alloy with better quality of joints. Various researchers are studied the joint properties of FSW and reported better corrosion resistance, natural heat protection, microstructural and mechanical properties. This review study emphasizes various joint characteristics of AA2219 alloy, such as tensile, microhardness, and microstructural characteristics of joints are obtained by FSW.
A Study on Friction Stir Welding Process for AA2219/AA2195 Joints
2018
The object of this work was to study mechanical properties of friction stir welded joints of AA2219 and AA2195. AA2219 has been used as an aerospace material for many years primarily due to its high weldability and high specific strength in addition to the excellent cryogenic properties so to be successfully used for manufacturing of cryogenic fuel tanks for space launchers. Relatively new Aluminum-Lithium alloy, AA2195 provides significant saving on weight and manufacturing costs with application of a friction stir welding. Friction stir welding is a solid-state joining process, which use a spinning tool to produce frictional heat in the work piece. To investigate the effect of the rotation direction of the tool, the joining was performed by switching positions of the two dissimilar alloys. The welding parameters include travelling speed, rotation speed and rotation direction of the tool, and the experiment was conducted under the conditions that the travelling speed of the tool was 120-300 mm/min and the rotation speed of the tool was 400-800 rpm. Tensile tests were conducted to study the strength of friction stir welded joints and microhardness were measured with microstructural analysis. The results indicate the failure occurred in the relatively weaker TMAZ/HAZ interface of AA2219. The optimum process condition was obtained at the rotation speed of 600-800 rpm and the travelling speed of 180-240 mm/min.
Aerospace Mechanics Journal, 2015
Friction Stir Welding (FSW) is a solid-state welding process used for welding similar and dissimilar materials. FSW is especially suitable to join sheet Al alloys, and this technique allows different material couples to be welded continuously. In this study, 1050 Al alloys and commercially pure Cu were produced at three different tool rotation speeds (630, 1330, 2440 rpm) and three different tool traverse speeds (20, 30, 50 mm/min) with four different tool position (0, 1, 1.5, 2 mm) by friction stir welding. The influence of the welding parameters on the microstructure and mechanical properties of the joints was investigated. Tensile and bending tests and microhardness measurements were used to determine the mechanical properties. The microstructures of the weld zone were investigated by optical microscope and scanning electron microscope (SEM) and were analyzed in an energy dispersed spectrometer (EDS). Intermetallic phases were detected based on the X-ray diffraction (XRD) analysis results that evaluated the formation of phases in the weld zone. When the welding performance of the friction stir welded butt joints was evaluated, the maximum value obtained was 89.55% with a 1330 rpm tool rotational speed, 20 mm/min traverse speed and a 1 mm tool position configuration. The higher tensile strength is attributed to the dispersion strengthening of the fine Cu particles distributed over the Al material in the stir zone region.
Interfacial Microstructure Analysis of AA2024 Welded Joints by Friction Stir Welding
Journal of New Materials for Electrochemical Systems, 2020
Process of joining different components by the application of external heat has resulted in induced stress on metals. Friction stir welding has been developed in order to avoid such residual stress development while joining. In this present work, aluminium alloy AA2024 plates were welded by using Friction stir welding process. The experiments were conducted for different combinations of parameters such as rotational speed, transverse speed and axial load. Welded joints developed were tested for mechanical and microstructure analysis. Mechanical joints developed have a maximum hardness of 147.6 hv in nugget zone and maximum tensile strength of 368.76 N/mm 2. Response surface analysis carried out has revealed that transverse speed and rotational speed has high impact on the hardness and tensile strength respectively. The grains at the nugget zone were very fine and uni-axed improving their tensile strength.
Mechanical and microstructure characterization of al 2029 by friction stir welding
Friction stir welding developed and established by the welding institute (TWI) among the all new welding technologies in 1991, and it is used commonly for welding of high strength aluminium alloy such as Al2029, which are difficult to weld by conventional fusion welding technique. Friction welding (FW) is a collection of a series of Friction-based solid state joining processes which can produce high quality of weld of different component with either similar or dissimilar material and has been attracting increasing attention. This work aim is to weld two plates of Al-2029 and to optimize the different mechanical properties of welded material and base material.
International Journal of Research in Engineering and Innovation , 2021
In this work, the analysis of friction stir welding on dissimilar aluminum alloys of AA2024 and AA5052 have been successfully fabricated. The mechanical characterization of FSW welded joints were investigated using experimental methodology by adjusting processing parameters. The confidence interval has shown that tensile strength and hardness increased with increasing tool rotation. The maximum tensile strength, and micro-hardness at nugget zone are 235 MPa, and 109 HV at tool rotation 1200 rpm, traverse speed 40 mm/min and tilt angle 20. The effect of tool rotation on FSW welded joint also improve the ductility of the welded joints, FSW welded joint with tool rotation 1200 rpm were more ductile than the FSW welded joint due to fine grain structure. When the tool rotational speed increases from 1200 rpm may produce an excessive release of stirred welded material on the top surfaces of the base plate, obtained micro void into the stirred zone. The grains size in the nugget zone at higher tool rotation (1200 rpm)was observed much finer (5.4 µm) than the lower tool rotation (800 rpm). The FSW welded portion at 800 rpm shows the large and deep dimples whereas welded portion at tool rotational speed of 1200 rpm shows fine and shallow dimples.
Friction Stir Welding of Aluminum Alloys: A Review and Prospective for the Future
2016
Friction stir welding, a solid state joining process, provides higher joints strength than that of fusion welding and minimize the problems associated with fusion welding processes. In friction stir welding process of aluminum alloys, welding parameters have influence on the welded joint strength involving similar or dissimilar aluminum alloys and composites. Using the inappropriate process parameters results in lower welded joint quality and affects the welded joint performance. This article has collected all useful factors affecting the welded joint qualities of aluminum alloys, welded joint characterization, microstructural characterization as well as the joining strengthening mechanism to provide valuable information for further improving the welded joint efficiency.
Al-Nahrain Journal for Engineering Sciences, 2019
This paper presents a comparison of using different techniques for stir spot welding of Aluminum 2024-T3, which are refill friction stir spot welding (RFSSW), edited (RFSSW-pin) and conventional friction stir spot welding (FSSW), depending on the obtained tensile shear strength property. Specimens were prepared from AA2024-T3 sheet for chemical analysis and mechanical tests. Workpieces were stir spot welded utilizing the above mentioned techniques at four rotational speeds (2000, 2500, 3000 and 4000 rpm) using tool pin diameters (5 and 7 mm) for conducting the tensile shear tests. The microhardness along the cross section of the welded specimens was conducted at the best conditions as well as the microstructure examination. The comparison results revealed that at the rotational speeds (2000 and 4000 rpm) in both cases of tool pin (5 and 7 mm), the ultimate tensile shear force was slightly higher than that for other speeds. However, the ultimate tensile shear force was found higher a...