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- Friction Stir Welding: Processes and Recent Developments
- FRICTION STIR WELDING -TECHNOLOGY AND FUTURE POTENTIAL
- Friction Stir Welding And Processing
- Advances in Friction-Stir Welding and Processing
Friction Stir Welding: Processes and Recent Developments
Friction stir welding FSW is now extensively employed in the aluminium using industries for joining and material processing applications. The technology has gained increasing interest and importance since its invention at TWIalmost 16 years ago. The paper will introduce a number of variants of FSW and describes some of the feasibility work that has been carried out to develop 'bobbin stir' welding for welding 25mm thick aluminium alloy material. The basic principle of conventional rotary friction stir welding FSW is shown in Figure 1. Basic principle of conventional rotary friction stir welding. The systematic development of Friction stir welding FSW has led to a number of variants of the technology.
FRICTION STIR WELDING -TECHNOLOGY AND FUTURE POTENTIAL
Friction stir processing FSP is a method of changing the properties of a metal through intense, localized plastic deformation. When ideally implemented, this process mixes the material without changing the phase by melting or otherwise and creates a microstructure with fine, equiaxed grains. In friction stir processing FSP , a rotating tool is used with a pin and a shoulder to a single piece of material to make specific property enhancement, such as improving the material's toughness or flexibility, in a specific area in the micro-structure of the material via fine grain of a second material with properties that improve the first. Ma  Friction between the tool and workpieces results in localized heating that softens and plasticizes the workpiece. A volume of processed material is produced by movement of materials from the front of the pin to the back of the pin. During this process, the material undergoes intense plastic deformation and this results in significant grain refinement. The grain refinement occurs on the base material improving properties of the first material, while mixing with the second material.
Friction-stir welding FSW is a solid-state joining process primarily used on aluminum, and is also widely used for joining dissimilar metals such as aluminum, magnesium, copper and ferrous alloys. Recently, a friction-stir processing FSP technique based on FSW has been used for microstructural modifications, the homogenized and refined microstructure along with the reduced porosity resulting in improved mechanical properties. Advances in friction-stir welding and processing deals with the processes involved in different metals and polymers, including their microstructural and mechanical properties, wear and corrosion behavior, heat flow, and simulation. The book is structured into ten chapters, covering applications of the technology; tool and welding design; material and heat flow; microstructural evolution; mechanical properties; corrosion behavior and wear properties. Later chapters cover mechanical alloying and FSP as a welding and casting repair technique; optimization and simulation of artificial neural networks; and FSW and FSP of polymers. Researchers in manufacturing engineering, metallurgy and materials science, advanced materials, and welding technologies. He received his PhD degree from the University of Leeds in
Friction Stir Welding And Processing
Rajiv S. Friction stir welding FSW is a relatively new solid-state joining process. This joining technique is energy efficient, environment friendly, and versatile. In particular, it can be used to join high-strength aerospace aluminum alloys and other metallic alloys that are hard to weld by conventional fusion welding. FSW is considered to be the most significant development in metal joining in a decade.
Advances in Friction-Stir Welding and Processing
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. Skip to main content Skip to table of contents. Advertisement Hide.
The welding process is promoted by the rotation and translation of an axis-symmetric non-consumable tool along the weld centerline. Thus, the FSW process is performed at much lower temperatures than conventional fusion welding, nevertheless it has some disadvantages. LAFSW is studied firstly to demonstrate the weldability of aluminum alloy using that technique. Secondly, process parameters, such as laser power and temperature gradient are investigated in order to evaluate changes in microstructure, micro-hardness, residual stress, and tensile properties. Once the possibility to achieve sound weld using LAFSW is demonstrated, it will be possible to explore the benefits for tool wear, higher welding speeds, and lower clamping force.
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