Investigation of microstructure and mechanical properties of friction stir welded joint of AA2024 and AA (original) (raw)
Related papers
International Journal of Research in Engineering and Innovation (IJREI), 2021
Friction stir welding (FSW) process has gained attention in recent years because of its advantages over the conventional fusion welding process. These advantages include the absence of heat formation in the affected zone and the absence of large distortion, porosity, oxidation, and cracking. Experimental investigations are necessary to understand the physical behavior that causes the high tensile strength of welded joints of different metals and alloys. This paper focuses on the effect of welding parameters on microstructure and mechanical properties of welded joint by friction stir welding. In this work, the fabrication of AA6061 and AA7050 was successfully done by friction stir welding, the confidence interval has shown that tensile strength and hardness increased with increasing tool rotation. The maximum tensile strength and % strain at SZ was observed 269 MPa, and 21.5 HV at TRS of 1000 rpm, and TS of 60 mm/min, and the maximum hardness at SZ was observed 135 HV at TRS of 750 rpm, and TS of 80 mm/min. The grains size in the SZ at higher tool rotation (1000 rpm) was much finer than the lower tool rotation (800 rpm). The FSWed portion at 500 rpm shows the big and deep dimples, while equiaxed fine dimples were observed at TRS of 1000 rpm.
Microstructure and Mechanical Properties of Friction Stir Welded AA2024-T3 Aluminum Alloy
Materials transactions, 2006
AA2024-T3 Aluminum alloy plates of 3 mm thickness were friction stir butt welded at a constant welding speed of 50 mm/min and rotation speeds of 400, 600, 800, 1000, 1250, and 1500 min À1. Effects of rotation speed on microstructures, hardness distributions, and tensile properties of the joints were investigated. Equiaxed grain size increased with increasing rotation speed till 1000 min À1 of rotation speed. Increase of rotation speed more than 1000 min À1 brought about no significant increase of grain size in the stir zone. Also, increasing rotation speed resulted in finer and more homogenous distributions of second phase particles in the stir zone. Hardness increased both in the stir zone and thermo mechanically affected zone as the rotation speed increased and reached to that of base metal. Kissing bond-free joints were fractured at the heat affected zone on the retreating side and a maximum tensile strength of the joints was 402 MPa which was achieved at 1250 min À1 of rotation speed. The joint efficiency was 88%.
A Study on Microstructure of AA2219 Friction Stir Welded Joint
2017
Friction Stir Welding (FSW) is an environment friendly solid-state joining technology that uses a rotating tool to generate frictional heat and plastic deformation with mixing of the soft material by the pin along the welding line. The advantages are low distortion, lack of traditional defects commonly found in fusion welds and high joint efficiency. The paper focuses on microstructure evolved after welding and the effect of welding process is discussed for aluminum alloy 2219. This alloy is selected because of high strength and good resistance to stress corrosion cracking at cryogenic temperature. The optimum process condition for FSW is determined with microstructural and mechanical properties. It is shown that the FSW provides higher performance for this alloy than the conventional welding technology.
2018
In this work, the effects of rotational and traverse speeds on the 1.5 mm butt joint performance of friction stir welded 2024-T4 aluminum alloy sheets have been investigated. Five rotational speeds ranging from 560 to 1800 rpm and five traverse speeds ranging from 11 to 45 mm/min have been employed. The characterization of microstructure and the mechanical properties (tensile, microhardness, and bending) of the welded sheets have been studied. The results reveal that by varying the welding parameters, almost sound joints and high performance welded joints can be successfully produced at the rotational speeds of 900 rpm and 700 rpm and the traverse speed of 35 mm/min. The maximum welding performance of joints is found to be 86.3% with 900 rpm rotational speed and 35 mm/min traverse speed. The microhardness values along the cross-section of the joints show a dramatic drop in the stir zone where the lowest value reached is about 63% of the base metal due to the softening of the welded ...
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...
Materials Transactions, 2007
Dissimilar aluminum alloys such as 2024-T3 and 7075-T6 plates 3 mm thickness were friction stir butt welded. The welding was carried out at a constant welding speed of 100 mm/min and rotation speeds of 400, 800, 1200, 1600 and 2000 min -1 . Effects of rotation speeds and fixed location of two alloys on microstructures especially the homogeneity of elemental distribution in the stir zone (SZ), hardness distributions, and tensile properties of the joints were investigated. The homogeneity of constituents of the two alloys in the SZ was analyzed by a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectroscopy (EDS). At the lowest rotation speed of 400 min -1 there was no mixing of two alloys in the SZ and a border between them was observed regardless of the fixed location. Increase of rotation speed more than 400 min -1 brought about a mixed structure likewise onion ring with periodic change of equiaxed grain size and heterogeneous distribution of alloying ...
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.
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.
The objective of this study is to apply the concept of Friction Stir welding technique to dissimilar aluminium alloys in order to evaluate the mechanical properties of the weld at the selected process parameters such as tool rotational speed, welding speed and tool pin profile. In this AA2024 T351 and AA7075T6 aluminium alloys were selected for the experimentation. The welding is carried out under different feeds at 80, 90 and 100 mm/min and tool rotation speeds at 1000, 1100 and 1200 rpm using two different tool profiles (threaded cylindrical and triangular). It is found based on the experimentation that the joints produced using triangular tool profile at feed rate of 100mm/min and tool rotation speeds of 1200 rpm produced as high tensile strength when compared with others.