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Author: Rémi Bertrand
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
L'industrie des transports cherche constamment à rendre ses structures plus résistantes tout en réduisant leur poids pour minimiser leur empreinte environnementale ou bien dans un but économique. Dans ce contexte, associer les alliages d'aluminium, possédant un excellent ratio poids-résistance mécanique, à des procédés d'assemblage innovants présente un très fort intérêt. Le soudage par friction malaxage (Friction Stir Welding - FSW) est un de ces procédés d'assemblage innovants. Il permet notamment de souder des tôles d'alliage d'aluminium de nuances réputées à faible indice de soudabilité et dans des configurations similaires ou dissimilaires. Plusieurs configurations de soudage FSW ont été investiguées dans la littérature, mais la configuration FSW 2024-T3/2198-T8, très attrayante pour l'industrie aéronautique, n'a jamais été étudiée. Dans cette étude, une analyse expérimentale de cette configuration de soudage est proposée pour la première fois. L'influence de l'évolution des vitesses d'avance Va et de rotation Vr de l'outil sur l'évolution des caractéristiques des soudures est quantifiée. Dans la fenêtre process choisie, l'évolution de la thermique est principalement influencée par celle de la vitesse d'avance Va tandis que le ratio de vitesses R = Va/Vr est un bon indicateur de la physionomie des soudures, de la formation des défauts et des performances en traction. Le champ de dureté, les contraintes résiduelles, les distorsions et la tenue en corrosion des assemblages soudés sont quant à eux peu influencés par l'évolution des vitesses de soudage. Ces travaux ont permis de documenter la formation de défauts internes au sein des soudures, mais aussi de mettre en évidence la relation entre vitesses de soudage et performances en traction et enfin de proposer une hypothèse : la présence d'un phénomène de protection cathodique au sein des soudures.
Author: Rémi Bertrand
Publisher:
ISBN:
Category :
Languages : fr
Pages :
Get Book Here
Book Description
L'industrie des transports cherche constamment à rendre ses structures plus résistantes tout en réduisant leur poids pour minimiser leur empreinte environnementale ou bien dans un but économique. Dans ce contexte, associer les alliages d'aluminium, possédant un excellent ratio poids-résistance mécanique, à des procédés d'assemblage innovants présente un très fort intérêt. Le soudage par friction malaxage (Friction Stir Welding - FSW) est un de ces procédés d'assemblage innovants. Il permet notamment de souder des tôles d'alliage d'aluminium de nuances réputées à faible indice de soudabilité et dans des configurations similaires ou dissimilaires. Plusieurs configurations de soudage FSW ont été investiguées dans la littérature, mais la configuration FSW 2024-T3/2198-T8, très attrayante pour l'industrie aéronautique, n'a jamais été étudiée. Dans cette étude, une analyse expérimentale de cette configuration de soudage est proposée pour la première fois. L'influence de l'évolution des vitesses d'avance Va et de rotation Vr de l'outil sur l'évolution des caractéristiques des soudures est quantifiée. Dans la fenêtre process choisie, l'évolution de la thermique est principalement influencée par celle de la vitesse d'avance Va tandis que le ratio de vitesses R = Va/Vr est un bon indicateur de la physionomie des soudures, de la formation des défauts et des performances en traction. Le champ de dureté, les contraintes résiduelles, les distorsions et la tenue en corrosion des assemblages soudés sont quant à eux peu influencés par l'évolution des vitesses de soudage. Ces travaux ont permis de documenter la formation de défauts internes au sein des soudures, mais aussi de mettre en évidence la relation entre vitesses de soudage et performances en traction et enfin de proposer une hypothèse : la présence d'un phénomène de protection cathodique au sein des soudures.
Author: Daniela Lohwasser
Publisher: Elsevier
ISBN: 1845697715
Category : Technology & Engineering
Languages : en
Pages : 437
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Book Description
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
Author: Pan Michaleris
Publisher: Elsevier
ISBN: 0857092901
Category : Technology & Engineering
Languages : en
Pages : 319
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Book Description
Welding is a cost-effective and flexible method of fabricating large structures, but drawbacks such as residual stress, distortion and buckling must be overcome in order to optimize structural performance. Minimization of welding distortion and buckling provides a systematic overview of the methods of minimizing distortion and buckling in welded structures.Following an introductory chapter, part one focuses on understanding welding stress and distortion, with chapters on such topics as computational welding mechanics, modelling the effect of phase transformations on welding stress and distortion and using computationally efficient reduced-solution methods to understand welding distortion. Part two covers different methods of minimizing welding distortion. Chapters discuss methods such as differential heating for minimizing distortion in welded stiffeners, dynamic thermal tensioning, reverse-side heating and ways of minimizing buckling such as weld cooling and hybrid laser arc welding.With its distinguished editor and international team of contributors, Minimization of welding distortion and buckling is an essential reference for all welders and engineers involved in fabrication of metal end-products, as well as those in industry and academia with a research interest in the area. - Provides a systematic overview of the methods of minimizing distortion and buckling in welded structures - Focuses on understanding welding stress and distortion featuring computational welding mechanics and modelling the effect of phase transformations - Explores different methods of minimizing welding distortion discussing differential heating and dynamic thermal tensioning
Author: Zhili Feng
Publisher: CRC Press
ISBN: 9780849334672
Category : Technology & Engineering
Languages : en
Pages : 372
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Book Description
As a fabrication technology, welding presents a number of technical challenges to the designer, manufacturer, and end-user of the welded structures. Both weld residual stress and distortion can significantly impair the performance and reliability of the welded structures. They must be properly dealt with during design, fabrication, and in-service use of the welded structures. There have been many significant and exciting developments on the subject in the past ten to fifteen years. Measurement techniques have been improved significantly. More importantly, the development of computational welding mechanics methods has been phenomenal. The progresses in the last decade or so have not only greatly expanded our fundamental understanding of the processes and mechanisms of residual stress and distortion during welding, but also have provided powerful tools to quantitatively determine the detailed residual stress and distortion information for a given welded structure. New techniques for effective residual stress and distortion mitigations and controls have also been applied in different industry sectors. Processes and Mechanisms of Welding Residual Stress and Distortion provides a comprehensive summary on the developments in the subject. It outlines theoretical treatments on heat transfer, solid mechanics and materials behavior that are essential for understanding and determining the welding residual stress and distortion. The approaches for computational methods and analysis methodology are described so that non specialists can follow them. There are chapters devoted to the discussion of various techniques for control and mitigation of residual stress and distortion, and residual stress and distortion results for various typical welded structures are provided. The second half of the book looks at case studies and practical solutions and provides insights into the techniques, challenges, limitations and future trends of each application. This book will not only be useful for advanced analysis of the subject, but also provide sufficient examples and practical solutions for welding engineers. With a panel of leading experts this authoritative book will be a valuable resource for welding engineers and designers as well as academics working in the fields of structural and mechanical engineering.
Author: Timothy Russell Gurney
Publisher: CUP Archive
ISBN: 9780521225588
Category : Technology & Engineering
Languages : en
Pages : 480
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Book Description
Author: Nilesh Kulkarni
Publisher: Butterworth-Heinemann
ISBN: 012800732X
Category : Technology & Engineering
Languages : en
Pages : 59
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Book Description
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
Author: Regis Blondeau
Publisher: John Wiley & Sons
ISBN: 1118623746
Category : Technology & Engineering
Languages : en
Pages : 384
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Book Description
This book offers a comprehensive overview on the subject of welding. Written by a group of expert contributors, the book covers all welding methods, from traditional to high-energy plasmas and lasers. The reference presents joint welding, stainless steel welding, aluminum welding, welding in the nuclear industry, and all aspects of welding quality control.
Author: Nilesh Kumar
Publisher: Butterworth-Heinemann
ISBN: 9780128024188
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
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.
Author: Zhe Jin
Publisher: TMS Publishing Company
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 576
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Book Description
"This is the proceedings of the third symposium on Hot Deformation in Aluminum Alloys, held in San Diego, CA, March 3-6, 2003."--p. xi.
Author: Noor Zaman Khan
Publisher: CRC Press
ISBN: 113819686X
Category : Technology & Engineering
Languages : en
Pages : 181
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Book Description
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.
