The Experts below are selected from a list of 17154 Experts worldwide ranked by ideXlab platform
Achilles Vairis - One of the best experts on this subject based on the ideXlab platform.
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A comparison between Friction stir Welding, linear Friction Welding and rotary Friction Welding
Advances in Manufacturing, 2016Co-Authors: Achilles Vairis, George Papazafeiropoulos, Andreas-marios TsainisAbstract:Three Friction Welding processes are compared for temperature, stresses and strains, as well as strain rates developed in the early phases of the processes, which are essential in their successful development. These are Friction stir Welding (FSW), linear Friction Welding (LFW) and rotary Friction Welding (RFW). Their common characteristic is the use of Friction to generate adequate energy and raise temperature locally in order to create favorable conditions for Welding at the interface between two parts. Although the mode of movement is different for each one of them, welds are produced through plastic deformation. The Lagrangian and coupled Eulerian-Lagrangian numerical models developed have produced results which are in qualitative agreement with experiments and have shed a light on the commonalities of these Friction Welding processes.
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linear and rotary Friction Welding review
International Materials Reviews, 2016Co-Authors: Achilles Vairis, M PreussAbstract:Friction Welding (FW) is a high quality, nominally solid-state joining process, which produces welds of high structural integrity. Rotary Friction Welding (RFW) is the most commonly used form of FW, while linear Friction Welding (LFW) is a relatively new method being used mainly for the production of integrally bladed disc (blisk) assemblies in the aircraft engine industry. Numerous similar and dissimilar joints of structural metallic materials have been welded with RFW and LFW. In this review, the current state of understanding and development of RFW and LFW is presented. Particular emphasis is placed on the process parameters, joint microstructure, residual stresses, mechanical properties and their relationships. Finally, opportunities for further research and development of the RFW and LFW processes are identified.
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Advances in Friction Welding
Advances in Materials Science and Engineering, 2014Co-Authors: Achilles Vairis, R. Mark WardAbstract:There is a continual requirement to make things perform better, be more predictably reliable, cost less, and use less energy.This often leads to requirements tomake components for them that are complex shapes or that have properties that vary from one location to another. These requirements are often difficult or expensive to satisfy by conventional machining and mechanical processing, but joining allows us to make complex shapes, potentially of materials with different properties. The disadvantage is that, often, joints require mass to be added to a design to carry the locally increased forces surrounding the joint. Alternatively the joint must be prepared and produced very carefully and may still have properties below those of the parent material. Extra mass or reduced properties (again requiring extra mass) increase the raw material costs and typically reduce the energy efficiency of the final product. Friction Welding offers an extremely promising way to make joints with minimal requirements for extra mass and with extremely good final product properties showing very low distortion. Particularly for metals appealing advantages are the self-cleaning nature of the process as it expels surface contamination that might ultimately lead to, for example, fatigue damage in service and the avoidance of melting at the joining interface which reduces metallurgical problems. All processes, to varying degree of course, are very reliable and repeatable, with few requirements in terms of nondestructive testing usually. Considerable work on Friction Welding has been undertaken at the Universities of Birmingham, Manchester, and Cranfield, TWI (UK),Northwestern Polytechnical University (China), Wroclaw University of Technology (Poland), University of Johannesburg (South Africa), University of Ulsan (South Korea), and Universiti Malaysia Perlis (Malaysia), among others. Inertia and rotary Friction Welding have been used since World War II in a wide range of applications such as shafts and valves, while linear Friction welds are already being used in high performance parts in aircraft engines. The Friction stir Welding family of applications (Friction stir Welding, Friction stir spot Welding, Friction stir processing, etc.) is used in the manufacture of structures utilising aluminium alloy plates of every grade. The seven papers in this special edition cover awide range of applications of the Friction Welding family ranging from rotary/inertia and linear to stir and stir spot Welding, as well as Friction stir processing.The topics of these papers are about dissimilar material joints, joint microstructure, mechanical properties, and various modelling techniques. We hope that you will find them useful in deciding how Friction joining can be used in your applications.
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Design and commissioning of a Friction Welding machine
Materials and Manufacturing Processes, 2006Co-Authors: Achilles Vairis, M. FrostAbstract:An experimental lightweight linear Friction Welding machine was designed and commissioned. The machine was designed to explore higher frequencies of oscillation (up to 1 kHz) than those commercially available, for a number of different amplitudes of oscillation. During the commissioning stage problems related to rig stiffening were recognized and the operating envelope of the machine was identified. Important Friction Welding process parameters like stress and temperature are monitored to evaluate process development and weld integrity.
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modelling the linear Friction Welding of titanium blocks
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2000Co-Authors: Achilles Vairis, M FrosAbstract:Abstract Analytical and numerical models of linear Friction Welding of Ti6Al4V (numbers indicate wt.%) are established to predict temperature rises during the initial phase of the process, which is of importance in forming sound welds. Both model predictions are compared with experimental data. The numerical model is used to explain the physical conditions that control the ability to weld under certain process conditions. The effects of the exothermic reaction of titanium with oxygen during the extrusion phase are also discussed.
M Preuss - One of the best experts on this subject based on the ideXlab platform.
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linear and rotary Friction Welding review
International Materials Reviews, 2016Co-Authors: Achilles Vairis, M PreussAbstract:Friction Welding (FW) is a high quality, nominally solid-state joining process, which produces welds of high structural integrity. Rotary Friction Welding (RFW) is the most commonly used form of FW, while linear Friction Welding (LFW) is a relatively new method being used mainly for the production of integrally bladed disc (blisk) assemblies in the aircraft engine industry. Numerous similar and dissimilar joints of structural metallic materials have been welded with RFW and LFW. In this review, the current state of understanding and development of RFW and LFW is presented. Particular emphasis is placed on the process parameters, joint microstructure, residual stresses, mechanical properties and their relationships. Finally, opportunities for further research and development of the RFW and LFW processes are identified.
S. Vinodh - One of the best experts on this subject based on the ideXlab platform.
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Optimization of Friction Welding of tube to tube plate using an external tool
Structural and Multidisciplinary Optimization, 2010Co-Authors: S. Senthil Kumaran, S. Muthukumaran, S. VinodhAbstract:The field of materials technology has been witnessing tremendous developments. Friction Welding is an important solid state joining technique. In this research study, Friction Welding of tube to tube plate using an external tool has been performed and the process parameters are optimized by Taguchi L_8 orthogonal array. The prioritization of the process parameters has been obtained and ANOVA has been conducted to predict the statistical significance of the process parameters. This is followed by the optimization of Welding process parameters using genetic algorithm. The practical feasibility of applying Genetic Algorithm to Friction Welding process has been ensured by means of studying the deviation between predicted and experimentally obtained Welding process parameters.
Tomoki Tomita - One of the best experts on this subject based on the ideXlab platform.
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Friction Welding process of 5052 aluminium alloy to 304 stainless steel
Materials Science and Technology, 1999Co-Authors: Shinji Fukumoto, Harushige Tsubakino, Kozo Okita, Masatoshi Aritoshi, Tomoki TomitaAbstract:AbstractType 5052 aluminium alloy was joined to type 304 austenitic stainless steel via a continuous drive Friction Welding process. The joint strength increased, and then decreased after reaching a maximum value, with increasing Friction time. Joint strength depended on the size and shape of the tensile testpiece. Friction weldability could be estimated by electrical resistmetry. The process of Friction Welding between the aluminium alloy and the stainless steel is proposed to evolve as follows: Welding progresses from the outer to the inner region; an unbonded region is retained at the centre of the weld interface with shorter Friction time; longer Friction time causes the formation of an intermetallic reaction layer at the weld interface; and the reaction layer grows as the Friction time increases. When the thickness of the reaction layer increased above a critical value, the joint was brittle and fractured at the weld interface. The joint was sound when there was no unbonded region and a thin reaction...
Mehran Maalekian - One of the best experts on this subject based on the ideXlab platform.
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Thermal-Phase Transformation Modelling and Neural Network Analysis of Friction Welding of Non-Circular Eutectoid Steel Components
Welding in the World, 2009Co-Authors: Mehran Maalekian, Horst CerjakAbstract:A thermal phase transformation finite element model is presented to study the orbital Friction Welding of eutectoid steel components. The experimental microstructure observations and the hardness profile in the weld and heat-affected zone verify the predictive capability of the proposed model. Moreover, based on the experimental Friction Welding data, a neural network analysis is presented which relates the weld integrity in terms of the size of the flash (upset) to the Friction Welding parameters.
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Friction Welding – critical assessment of literature
Science and Technology of Welding and Joining, 2007Co-Authors: Mehran MaalekianAbstract:AbstractFriction Welding is now well established as a means of joining many different types of materials, because it has proved itself to be a reliable and economical way of producing high quality welds. The present paper introduces different Friction Welding processes, their advantages and shortcomings. The history of Friction Welding and typical applications are also reviewed. In the context of Friction Welding, a number of subjects, such as Frictional behaviour, joining mechanism, interface temperature and heat generation, still exist, where different concepts for explanation of the physical mechanisms have been proposed by different investigators. To clarify some inconsistencies in the interpretation of the Friction Welding process, a thorough review and critical assessment of the literature associated with this process is attempted.
