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Failure Mechanisms Of Advanced Welding Processes

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Failure Mechanisms of Advanced Welding Processes

Failure Mechanisms of Advanced Welding Processes Book
Author : X Sun
Publisher : Elsevier
Release : 2010-07-15
ISBN : 1845699769
Language : En, Es, Fr & De

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Book Description :

Many new, or relatively new, welding processes such as friction stir welding, resistance spot welding and laser welding are being increasingly adopted to replace or improve on traditional welding techniques. Before advanced welding techniques are employed, their potential failure mechanisms should be well understood and their suitability for welding particular metals and alloys in different situations should be assessed. Failure mechanisms of advanced welding processes provides a critical analysis of advanced welding techniques and their potential failure mechanisms. The book contains chapters on the following topics: Mechanics modelling of spot welds under general loading conditions and applications to fatigue life predictions, Resistance spot weld failure mode and weld performance for aluminium alloys, dual phase steels and TRIP steels, Fatigue behaviour of spot welded joints in steel sheets, Non-destructive evaluation of spot weld quality, Solid state joining - fundamentals of friction stir welding, Failure mechanisms in friction stir welds, Microstructure characteristics and mechanical properties of laser weld bonding of magnesium alloy to aluminium alloy, Fatigue in laser welds, Weld metal ductility and its influence on formability of tailor welded blanks, Joining of lightweight materials using reactive nanofoils, and Fatigue life prediction and improvements for MIG welded advanced high strength steel weldments. With its distinguished editor and international team of contributors, Failure mechanisms of advanced welding processes is a standard reference text for anyone working in welding and the automotive, shipbuilding, oil and gas and other metal fabrication industries who use modern and advanced welding processes. Provides a critical analysis of advanced welding techniques and their potential failure mechanisms Experts in the field survey a range of welding processes and examine reactions under various types of loading conditions Examines the current state of fatigue life prediction of welded materials and structures in the context of spot welded joints and non-destructive evaluation of quality

Minimization of Welding Distortion and Buckling

Minimization of Welding Distortion and Buckling Book
Author : Pan Michaleris
Publisher : Elsevier
Release : 2011-05-25
ISBN : 0857092901
Language : En, Es, Fr & De

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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

Computational Modeling of the Friction Stir Welding Process FSW and of the Performance of FSW Joints

Computational Modeling of the Friction Stir Welding Process  FSW  and of the Performance of FSW Joints Book
Author : Ajay Prasad Arakere
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Abstract: Friction Stir Welding (FSW) is a solid-state metal-joining process. Within FSW, a (typically) cylindrical tool-pin (threaded at the bottom and terminated with a circular-plate shape shoulder, at the top) is driven between two firmly-clamped plates (placed on a rigid backing support). Due to a high normal downward pressure applied to the shoulder and due to frictional sliding and plastic-deformation, substantial amount of heat is generated at the tool/work-piece interface and in the region underneath the tool shoulder. Thermally plasticized work-piece material is then extruded around the traveling tool and forged into a welding-joint behind the tool. Due to its solid-state character and lower process temperatures, FSW possesses a number of advantages in comparison to the conventional fusion welding processes. In the present work, advanced computational methods and tools are used to investigate three specific aspects of the FSW process: (a) material flow and stirring/mixing: Within the numerical model of the FSW process, the FSW tool is treated as a Lagrangian component while the workpiece material is treated as a Eulerian component. The employed coupled Eulerian/Lagrangian computational analysis of the welding process was of a two-way thermo-mechanical character (i.e. frictional-sliding/plastic-work dissipation is taken to act as a heat source in the thermal-energy balance equation) while temperature is allowed to affect mechanical aspects of the model through temperature-dependent material properties. The workpiece material (AA5059, solid-solution strengthened and strain-hardened aluminum alloy) is represented using a modified version of the classical Johnson-Cook model (within which the strain-hardening term is augmented in order to take into account for the effect of dynamic recrystallization) while the FSW tool material (AISI H13 tool steel) is modeled as an isotropic linear-elastic material. Within the analysis, the effects of some of the FSW key process parameters are investigated (e.g. weld pitch, tool tilt-angle and the tool pin-size). The results pertaining to the material flow during FSW are compared with their experimental counterparts. It is found that, for the most part, experimentally observed material-flow characteristics are reproduced within the current FSW-process model; (b) modifications of the existing workpiece material models for use in FSW simulations: Johnson-Cook strength material model is frequently used in finite element analyses of various manufacturing processes involving plastic deformation of metallic materials. The main attraction to this model arises from its mathematical simplicity and its ability to capture the first order metal-working effects (e.g. those associated with the influence of the extent of plastic deformation, rate of deformation and the attendant temperature). However, this model displays serious shortcomings when used in the engineering analyses of various hot-working processes (i.e. those utilizing temperatures higher than the material recrystallization temperature). These shortcomings are related to the fact that microstructural changes involving: (i) irreversible decrease in the dislocation density due to the operation of annealing/recrystallization processes; (ii) increase in grain size due to high-temperature exposure; and (iii) dynamic recrystallization-induced grain refinement, are not accounted for by the model. In the present work, an attempt is made to combine the basic physical-metallurgy principles with the associated kinetics relations in order to properly modify the Johnson-Cook material model, so that the model can be used in the analyses of metal hot-working and joining processes. The model is next used to help establish relationships between process parameters, material microstructure and properties in FSW welds of AA5083 (a non-age-hardenable, solid-solution strengthened, strain-hardened/stabilized Al-Mg-Mn alloy); and (c) FSW-joint failure mechanisms under ballistic impact loading conditions: A critical assessment is carried out of the microstructural changes, of the associated reductions in material mechanical properties and of the attendant ballistic-impact failure mechanisms in prototypical Friction Stir Welding (FSW) joints found in armor structures made of high-performance aluminum alloys (including solution-strengthened and age-hardenable aluminum alloy grades). It is argued that due to the large width of FSW joints found in thick aluminum-armor weldments, the overall ballistic performance of the armor is controlled by the ballistic limits of its weld zones (e.g. heat affected zone, the thermo-mechanically affected zone, the nugget, etc.). Thus, in order to assess the overall ballistic survivability of an armor weldment, one must predict/identify welding-induced changes in the material microstructure and properties and the operative failure mechanisms in different regions of the weld. Towards that end, a procedure is proposed in the present work which combines the results of the FSW process modeling, basic physical-metallurgy principles concerning microstructure/property relations and the fracture mechanics concepts related to the key blast/ballistic-impact failure modes. The utility of this procedure is demonstrated using the case of a solid-solution strengthened and cold-worked aluminum alloy armor FSW-weld test structure.

Materials World

Materials World Book
Author : Anonim
Publisher : Unknown
Release : 2006
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Welding Journal

Welding Journal Book
Author : Anonim
Publisher : Unknown
Release : 2008
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Metals Abstracts

Metals Abstracts Book
Author : Anonim
Publisher : Unknown
Release : 1999
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Advanced Materials Processes

Advanced Materials   Processes Book
Author : Anonim
Publisher : Unknown
Release : 2000
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Research and Technology Program Digest

Research and Technology Program Digest Book
Author : United States. National Aeronautics and Space Administration. Office of Advanced Research and Technology
Publisher : Unknown
Release : 1967
ISBN : 0987650XXX
Language : En, Es, Fr & De

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International Aerospace Abstracts

International Aerospace Abstracts Book
Author : Anonim
Publisher : Unknown
Release : 1999
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Reliability Physics 1974

Reliability Physics 1974 Book
Author : Anonim
Publisher : Unknown
Release : 1974
ISBN : 0987650XXX
Language : En, Es, Fr & De

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U S Government Research Development Reports

U S  Government Research   Development Reports Book
Author : Anonim
Publisher : Unknown
Release : 1967
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Welding

Welding Book
Author : Anonim
Publisher : Unknown
Release : 1980
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Welding and Metal Fabrication

Welding and Metal Fabrication Book
Author : Anonim
Publisher : Unknown
Release : 1978
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Iron and Steel International

Iron and Steel International Book
Author : Anonim
Publisher : Unknown
Release : 1976
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Resistance Spot Welding

Resistance Spot Welding Book
Author : Menachem Kimchi,David H. Phillips
Publisher : Morgan & Claypool Publishers
Release : 2017-09-08
ISBN : 1681731711
Language : En, Es, Fr & De

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Book Description :

The early chapters of this book provide thorough coverage of resistance spot welding fundamentals and principles. Topics covered include lobe and current range curves, contact resistance vs. electrode force, dynamic resistance, heat balance, nugget growth, etc. Equipment issues such as machine types, power supplies, and electrodes are addressed. Subsequent chapters focus on specific spot welding challenges to modern automotive manufacturing. Approaches to welding modern materials including advanced high strength steels, coated steels, and aluminum alloys are covered in much detail. The final chapters focus on many common production and quality control issues, such as electrode wear, monitoring and testing, computational modeling, and welding codes. The overall goal of the book is to provide a comprehensive resource for automotive engineers and technicians who work with modern spot welding equipment and automotive materials.

Welding Research Council Bulletin Series

Welding Research Council Bulletin Series Book
Author : Welding Research Council (U.S.)
Publisher : Unknown
Release : 1998
ISBN : 0987650XXX
Language : En, Es, Fr & De

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CIM Bulletin

CIM Bulletin Book
Author : Canadian Institute of Mining and Metallurgy
Publisher : Unknown
Release : 1987
ISBN : 0987650XXX
Language : En, Es, Fr & De

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British Journal of Non destructive Testing

British Journal of Non destructive Testing Book
Author : Anonim
Publisher : Unknown
Release : 1972
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Ceramic Abstracts

Ceramic Abstracts Book
Author : American Ceramic Society
Publisher : Unknown
Release : 1995
ISBN : 0987650XXX
Language : En, Es, Fr & De

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