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Friction Stir Welding Of High Strength Precipitation Strengthened Aluminum Alloys
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Book Synopsis Friction Stir Welding of High Strength 7XXX Aluminum Alloys by : Rajiv S. Mishra
Download or read book Friction Stir Welding of High Strength 7XXX Aluminum Alloys written by Rajiv S. Mishra and published by Butterworth-Heinemann. This book was released on 2016-06-08 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction Stir Welding of High Strength 7XXX Aluminum Alloys is the latest edition in the Friction Stir series and summarizes the research and application of friction stir welding to high strength 7XXX series alloys, exploring the past and current developments in the field. Friction stir welding has demonstrated significant benefits in terms of its potential to reduce cost and increase manufacturing efficiency of industrial products in transportation, particularly the aerospace sector. The 7XXX series aluminum alloys are the premium aluminum alloys used in aerospace. These alloys are typically not weldable by fusion techniques and considerable effort has been expended to develop friction stir welding parameters. Research in this area has shown significant benefit in terms of joint efficiency and fatigue performance as a result of friction stir welding. The book summarizes those results and includes discussion of the potential future directions for further optimization. Offers comprehensive coverage of friction stir welding of 7XXX series alloys Discusses the physical metallurgy of the alloys Includes physical metallurgy based guidelines for obtaining high joint efficiency Summarizes the research and application of friction stir welding to high strength 7XXX series alloys, exploring the past and current developments in the field
Book Synopsis Friction Stir Welding of High Strength Precipitation Strengthened Aluminum Alloys by : Harpreet Sidhar
Download or read book Friction Stir Welding of High Strength Precipitation Strengthened Aluminum Alloys written by Harpreet Sidhar and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rising demand for improved fuel economy and structural efficiency are the key factors for use of aluminum alloys for light weighting in aerospace industries. Precipitation strengthened 2XXX and 7XXX aluminum alloys are the key aluminum alloys used extensively in aerospace industry. Welding and joining is the critical step in manufacturing of integrated structures. Joining of precipitation strengthened aluminum alloys using conventional fusion welding techniques is difficult and rather undesirable in as it produces dendritic microstructure and porosities which can undermine the structural integrity of weldments. Friction stir welding, invented in 1991, is a solid state joining technique inherently benefitted to reduces the possibility of common defects associated with fusion based welding techniques. Weldability of various 2XXX and 7XXX aluminum alloys via friction stir welding was investigated. Microstructural and mechanical property evolution during welding and after post weld heat treatment was studied using experimental techniques such as transmission electron microscopy, differential scanning calorimetry, hardness testing, and tensile testing. Various factors such as peak welding temperature, cooling rate, external cooling methods (thermal management) which affects the strength of the weldment were studied. Post weld heat treatment of AL-Mg-Li alloy produced joint as strong as the parent material. Modified post weld heat treatment in case of welding of Al-Zn-Mg alloy also resulted in near 100% joint efficiency whereas the maximum weld strength achieved in case of welds of Al-Cu-Li alloys was around 80-85% of parent material strength. Low dislocation density and high nucleation barrier for the precipitates was observed to be responsible for relatively low strength recovery in Al-Cu-Li alloys as compared to Al-Mg-Li and Al-Zn-Mg alloys.
Book Synopsis Friction Stir Welding of 2XXX Aluminum Alloys including Al-Li Alloys by : Rajiv S. Mishra
Download or read book Friction Stir Welding of 2XXX Aluminum Alloys including Al-Li Alloys written by Rajiv S. Mishra and published by Butterworth-Heinemann. This book was released on 2016-10-01 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction Stir Processing of 2XXX Aluminum Alloys including Al-Li Alloys is the latest edition in the Friction Stir Welding and Processing series and examines the application of friction stir welding to high strength 2XXX series alloys, exploring the past and current developments in the field. The book features recent research showing significant benefit in terms of joint efficiency and fatigue performance as a result of friction stir welding. Friction stir welding has demonstrated significant benefits in terms of its potential to reduce cost and increase manufacturing efficiency of industrial products including transportation, particularly the aerospace sector. The 2XXX series aluminum alloys are the premium aluminum alloys used in aerospace. The book includes discussion of the potential future directions for further optimization, and is designed for both practicing engineers and materials scientists, as well as researchers in the field. Provides comprehensive coverage of friction stir welding of 2XXX series alloys Discusses the physical metallurgy of the alloys Includes physical metallurgy-based guidelines for obtaining high joint efficiency Features illustrated examples of the application of FSW in the aerospace industry
Book Synopsis Friction Stir Welding and Processing by : Rajiv S. Mishra
Download or read book Friction Stir Welding and Processing written by Rajiv S. Mishra and published by ASM International. This book was released on 2007-01-01 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the rapidly growing area of friction stir welding. It also addresses the use of the technology for other types of materials processing, including superplastic forming, casting modification, and surface treatments. The book has been prepared to serve as the first general reference on friction stir technology,. Information is provided on tools, machines, process modeling, material flow, microstructural development and properties. Materials addressed include aluminum alloys, titanium alloys, steels, nickel-base alloys, and copper alloys. The chapters have been written by the leading experts in this field, representing leading industrial companies and university and government research insititutions.
Book Synopsis Process-Structure-Property Relationships in Friction Stir Welded Precipitation Strengthened Aluminum Alloys by : Barnali Mondal
Download or read book Process-Structure-Property Relationships in Friction Stir Welded Precipitation Strengthened Aluminum Alloys written by Barnali Mondal and published by . This book was released on 2019 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through a series of carefully designed experiments, characterization and some modeling tools, this work is aimed at studying the role of thermal profiles on different microstructural zones and associated properties like strength and corrosion through a variation of weld parameters, thermal boundary conditions and material temper. Two different alloys belonging to the Al-Cu and Al-Cu-Li system in different temper conditions- peak aged (T8) and annealed (O) were used. A 3D-thermal pseudo mechanical (TPM) model is developed for the FSW process using heat transfer module in COMSOL Multiphysics and is based on a heat source wherein the temperature dependent yield shear stress is used for the heat generation. The precipitation and coarsening model is based on the Kampmann and Wagner theoretical framework and accounts for the competition between the various nucleation sites for both metastable and equilibrium precipitates. The model predicts different precipitate mean radius and volume fraction for the various zones in the friction stir welded material. A model for the yield strength is developed which considers contributions from different strengthening mechanisms. The predictions of the each models have been verified against experimental data and literature. At constant advance per rotation, the peak temperature decreases with a decrease in traverse speed and increases with an increase in tool rotation. Weld properties were significantly affected by choice of thermal boundary conditions in terms of backing plate diffusivity. Weld conditions with a higher peak temperature and high strain rate results in more dissolution of precipitates and fragmentation of constituent particles resulting in a better corrosion behavior for the weld nugget. For a peak aged temper of 2XXX alloys, the weld nugget experiences dissolution of strengthening precipitates resulting in a lower strength and the Heat affected zone (HAZ) experiences coarsening of precipitates. For an annealed material, both the weld nugget and HAZ experiences dissolution of precipitates with an increase in strength in the weld nugget.
Book Synopsis Friction Stir Welding of Aluminium Alloys by : Moataz Attallah
Download or read book Friction Stir Welding of Aluminium Alloys written by Moataz Attallah and published by LAP Lambert Academic Publishing. This book was released on 2011-02 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction Stir Welding (FSW) is known to result in a complex microstructural development, with features that remain unexplained, such as: the formation of the onion rings structure. Moreover, various microstructural factors have been suggested to control the strength in Al-Mg AA5xxx welds, without identifying their relative contribution. Furthermore, the influence of the basemetal microstructural parameters (e.g. grains, intermetallic particles, stored energy) on the microstructure-property development has not been previously investigated. These issues are addressed in the present study.
Book Synopsis Friction Stir Welding by : Noor Zaman Khan
Download or read book Friction Stir Welding written by Noor Zaman Khan and published by CRC Press. This book was released on 2017-07-28 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution of mechanical properties and its characterization is important to the weld quality whose further analysis requires mechanical property and microstructure correlation. Present book addresses the basic understanding of the Friction Stir Welding (FSW) process that includes effect of various process parameters on the quality of welded joints. It discusses about various problems related to the welding of dissimilar aluminium alloys including influence of FSW process parameters on the microstructure and mechanical properties of such alloys. As a case study, effect of important process parameters on joint quality of dissimilar aluminium alloys is included.
Book Synopsis Friction Stir Welding and Processing by : Rajiv Sharan Mishra
Download or read book Friction Stir Welding and Processing written by Rajiv Sharan Mishra and published by Springer. This book was released on 2014-08-04 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book lays out the fundamentals of friction stir welding and processing and builds toward practical perspectives. The authors describe the links between the thermo-mechanical aspects and the microstructural evolution and use of these for the development of the friction stir process as a broader metallurgical tool for microstructural modification and manufacturing. The fundamentals behind the practical aspects of tool design, process parameter selection and weld related defects are discussed. Local microstructural refinement has enabled new concepts of superplastic forming and enhanced low temperature forming. The collection of friction stir based technologies is a versatile set of solid state manufacturing tools.
Book Synopsis Corrosion Behavior of Friction Stir Welded High Strength Aluminum Alloys by : J. B. Lumsden
Download or read book Corrosion Behavior of Friction Stir Welded High Strength Aluminum Alloys written by J. B. Lumsden and published by . This book was released on 2002 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction stir welding (FSW), a relatively new solid state joining process, is used to join aluminum alloys of all compositions including alloys essentially considered unweldable. During FSW, a rotating tool provides a continual hot working action, plasticizing metal within a narrow zone at the join line, while transporting metal from the leading face of the probe to the trailing edge as the tool moves along the interface. Although melting does not occur during FSW, temperatures are sufficiently high and times at temperature sufficiently long to cause dissolution, nucleation, and/or coarsening of strengthening precipitates. The temperature-time profile changes with distance from the nugget causing a gradient in micro structure and precipitate morphology. The altered micro structure in the weld zone becomes sensitized in some high strength aluminum alloys. Results presented assess the pitting, intergranular, and SCC corrosion behavior of FSW 7XXX and 2XXX alloys. Progress in understanding the changes in microstructure responsible for the sensitization will be discussed. The presentation also will include evaluations of approaches for corrective measures.
Book Synopsis Friction Stir Welding of Dissimilar Alloys and Materials by : Nilesh Kulkarni
Download or read book Friction Stir Welding of Dissimilar Alloys and Materials written by Nilesh Kulkarni and published by Butterworth-Heinemann. This book was released on 2015-03-05 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will summarize research work carried out so far on dissimilar metallic material welding using friction stir welding (FSW). Joining of dissimilar alloys and materials are needed in many engineering systems and is considered quite challenging. Research in this area has shown significant benefit in terms of ease of processing, material mixing, and superior mechanical properties such as joint efficiencies. A summary of these results will be discussed along with potential guidelines for designers. Explains solid phase process and distortion of work piece Addresses dimensional stability and repeatability Addresses joint strength Covers metallurgical properties in the joint area Covers fine microstructure Introduces improved materials use (e.g., joining different thicknesses) Covers decreased fuel consumption in light weight aircraft Addresses automotive and ship applications
Book Synopsis Friction Stir Welding by : Daniela Lohwasser
Download or read book Friction Stir Welding written by Daniela Lohwasser and published by Elsevier. This book was released on 2009-12-18 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction stir welding (FSW) is a highly important and recently developed joining technology that produces a solid phase bond. It uses a rotating tool to generate frictional heat that causes material of the components to be welded to soften without reaching the melting point and allows the tool to move along the weld line. Plasticized material is transferred from the leading edge to trailing edge of the tool probe, leaving a solid phase bond between the two parts. Friction stir welding: from basics to applications reviews the fundamentals of the process and how it is used in industrial applications.Part one discusses general issues with chapters on topics such as basic process overview, material deformation and joint formation in friction stir welding, inspection and quality control and friction stir welding equipment requirements and machinery descriptions as well as industrial applications of friction stir welding. A chapter giving an outlook on the future of friction stir welding is included in Part one. Part two reviews the variables in friction stir welding including residual stresses in friction stir welding, effects and defects of friction stir welds, modelling thermal properties in friction stir welding and metallurgy and weld performance.With its distinguished editors and international team of contributors, Friction stir welding: from basics to applications is a standard reference for mechanical, welding and materials engineers in the aerospace, automotive, railway, shipbuilding, nuclear and other metal fabrication industries, particularly those that use aluminium alloys. Provides essential information on topics such as basic process overview, materials deformation and joint formation in friction stir welding Inspection and quality control and friction stir welding equipment requirements are discussed as well as industrial applications of friction stir welding Reviews the variables involved in friction stir welding including residual stresses, effects and defects of friction stir welds, modelling thermal properties, metallurgy and weld performance
Book Synopsis Joining Technologies by : Mahadzir Ishak
Download or read book Joining Technologies written by Mahadzir Ishak and published by BoD – Books on Demand. This book was released on 2016-09-21 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Joining and welding are two of the most important processes in manufacturing. These technologies have vastly improved and are now extensively used in numerous industries. This book covers a wide range of topics, from arc welding (GMAW and GTAW), FSW, laser and hybrid welding, and magnetic pulse welding on metal joining to the application of joining technologies for textile products. The analysis of temperature and phase transformation is also incorporated. This book also discusses the issue of dissimilar joint between metal and ceramic, as well as the technology of diffusion bonding.
Book Synopsis Friction Stir Welding and Processing in Alloy Manufacturing by : Carlos Agelet de Saracibar
Download or read book Friction Stir Welding and Processing in Alloy Manufacturing written by Carlos Agelet de Saracibar and published by MDPI. This book was released on 2019-08-02 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue Friction Stir Welding and Processing in Alloy Manufacturingthat was published in Metals
Book Synopsis Friction Stir Welding and Processing VIII by : Rajiv Mishra
Download or read book Friction Stir Welding and Processing VIII written by Rajiv Mishra and published by Springer. This book was released on 2016-12-01 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection focuses on all aspects of science and technology related to friction stir welding and processing.
Book Synopsis Residual Stresses in Friction Stir Welding by : Nilesh Kulkarni
Download or read book Residual Stresses in Friction Stir Welding written by Nilesh Kulkarni and published by Butterworth-Heinemann. This book was released on 2013-11-20 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the fundamentals of residual stresses in friction stir welding and reviews the data reported for various materials. Residual stresses produced during manufacturing processes lead to distortion of structures. It is critical to understand and mitigate residual stresses. From the onset of friction stir welding, claims have been made about the lower magnitude of residual stresses. The lower residual stresses are partly due to lower peak temperature and shorter time at temperature during friction stir welding. A review of residual stresses that result from the friction stir process and strategies to mitigate it have been presented. Friction stir welding can be combined with additional in-situ and ex-situ manufacturing steps to lower the final residual stresses. Modeling of residual stresses highlights the relationship between clamping constraint and development of distortion. For many applications, management of residual stresses can be critical for qualification of component/structure. Reviews magnitude of residual stresses in various metals and alloys Discusses mitigation strategies for residual stresses during friction stir welding Covers fundamental origin of residual stresses and distortion
Book Synopsis The Effects of Friction Stir Welding on the Microstructure and Mechanical Behavior of Aluminum Alloy Aa2139-t8 by : Uchechi Chinaka Okeke
Download or read book The Effects of Friction Stir Welding on the Microstructure and Mechanical Behavior of Aluminum Alloy Aa2139-t8 written by Uchechi Chinaka Okeke and published by . This book was released on 2021 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: The demand for both high-strength and lightweight metals for structural applications to increase vehicle mobility has driven an increase in the research and development of lightweight alloys, including those based on aluminum (Al), to replace commonly-used steel. When alloyed copper (Cu), Al alloys can exhibit high tensile strengths. However, Al-Cu alloys are difficult to join using fusion welding processes due to solidification cracking. To circumvent the issues that arise with fusion welding, friction stir welding (FSW) can be employed. FSW is a solid state joining method that utilizes friction generated heat between a rotating tool and two metal plates to create a joint without the use of additional material. FSW temperatures are lower than the melting point and are historically achieved by controlling the welding speed. The welding temperature has largely been both an uncontrolled and unmonitored variable, which presents an issue when trying to predict or explain the weld microstructures. In addition, most FSW investigations are performed on parts that are less than 12 mm thick. This limits the understanding of processing-microstructure-property relationships of thicker FSW plates. This dissertation studied the effect of FSW on the microstructure and mechanical behavior of 25 mm thick AA2139-T8, a precipitation strengthened Al-Cu-Mg-Ag alloy. Processing-microstructure-property relationships were studied using both constant-speed (150 RPM and 50 mm/min) and constant-temperature FSW (performed at 490 ℗ʻC, 500 ℗ʻC, and 510 ℗ʻC). The microstructural evolution throughout the thickness of the weld was analyzed via optical microscopy, SEM, TEM, and XRD. The mechanical behavior was analyzed using tensile and Vickers hardness experiments. The distribution of the different precipitates was plotted throughout the welded area for the constant-temperature FSW materials. The average matrix grain size decreased from the weld top to bottom, while the precipitate volume percent increased from the weld top to bottom. The stir zone (SZ) exhibited lower strengths and hardness than the base metal. In addition, the larger grains in the upper weld nugget (UWN) of the SZ had a higher hardness than the smaller grains in the lower weld nugget (LWN) of the SZ and this was explained by the dissolution of the precipitates during welding and the associated solid solution strengthening. This study was the first to perform constant-temperature FSW on both an Al-Cu-Mg-Ag alloy and a 25 mm thick plate. Compared with the 500 ℗ʻ and 510 ℗ʻC constant-temperature FSW, the 490 ℗ʻC constant-temperature FSW yielded the smallest average grain size and the highest precipitate volume percent through the SZ. The average grain size increased with welding temperature. The 510 ℗ʻC FSW exhibited the lowest room-temperature (RT) tensile YS, UTS, Îæf, and joint efficiency due to the void formation during the welding. The 490 ℗ʻC and 500 ℗ʻC FSWs failed at the interface between the SZ and the thermomechanically affected zone (TMAZ) and in the HAZ, respectively, which were the weakest links of the weld and dictated the tensile properties. The work in this dissertation provided new insights into the effects of constant temperature FSW on the microstructural evolution and the mechanical properties through the weld thickness. The knowledge gained from this work will not only assist in determining optimal welding parameters for this alloy for targeted applications, but will also serve as a framework for future research targeted at understanding processing-microstructure-property relationships of a variety of metallic systems undergoing not only FSW under controlled conditions but also undergoing different controlled thermomechanical processing treatments.
Book Synopsis Friction-Stir Welding: Principles and Applications by : Max McWilliams
Download or read book Friction-Stir Welding: Principles and Applications written by Max McWilliams and published by Nova Science Publishers. This book was released on 2020-09-14 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principles and applications of friction-stir welding, a solid-state metal joining widely used to weld aluminum and its composites, are assessed. Friction stir processing, a novel process developed for microstructural modification of metallic materials, is also discussed.Academic studies and current sectoral applications of friction stir welding in shipbuilding are examined in detail. In addition, general literature reviews related to the joining of aluminum and steel with friction stir welding are explored.The authors examine past research comparing the friction stir welding and submerged friction stir welding, use of different medium under which the welding is performed, design and process parameters, applications and possibility of future research.In the closing study, a microstructural and statistical approach is performed to obtain a high strength welded joint in the dissimilar friction stir welding of AA 7075 and AA 6013 aluminum alloys.