Fsw Research Papers - Academia.edu (original) (raw)

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- by
- •
- Finite Element Analysis (FEA), Abaqus, Fsw

Friction-stir welding (FSW)is a novel green solid state joining process particularly used to join high strength aerospace aluminum alloys which are otherwise difficult to weld by conventional fusion welding. Unlike other solid state joining technique, in Friction stir welding a third body contact by tool will generate the additional interface surfaces and finally all the surfaces are coalesced with each other by applied pressure and temperature and form solid state weld. This work shows overview of Friction stir welding which includes the basic concept of the process, microstructure formation, influencing process parameters, typical defects in FSW process and some recent applications. In this project, FEA analysis is performed for friction stir welding of different aluminum alloys. The welds are produced by varying the process parameters; the rotational speed was varied between 900 to 1800 rpm and the welding speed varied between 40 and 300mm/min. A parametric model with the weld plates and cutting tool is done in ProE. The effects of different (square and round) tool pin profiles on the friction stir welding are also considered for analysis. Different tool pin profiles are square, circular square with thread. We are using Vertical milling machine for doing welds. And also we are doing Tensile testing, Hardness and Microscopy for Structure at welding spots. Modeling is done in proe software and analysis is done in Ansys. The best parameters found from the experiments are 1800 rpm square is better for welding using HSS tool.

- by Ravindrasai A
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- Friction Welding, Aluminium Alloys, Friction Stir Welding, Fsw

The main objective of this paper work is to optimize the welding parameters such that the maximum temperature in the work piece material reaches up to 80-90% of melting point of base material in friction stir welding of aluminum plates. Friction stir welding (FSW), invented and established by The Welding Institute (TWI) in 1991 amongst the emerging new welding technologies, is used frequently for welding of high strength aluminum alloys which are difficult to weld by conventional fusion welding techniques. Friction stir welding (FSW) is a relatively new welding process that may have significant advantages compared to the fusion processes as follow: joining of conventionally non-fusion weldable alloys, reduced distortion and improved mechanical properties of weldable alloys joints due to the pure solid-state joining of metals. The study of microstructure and flow of material around the welding tool during friction stir welding (FSW) is closely linked to many of the key issues related to the process. The heat source in this model is the friction between the material and the probe and the shoulder. For understanding the FSW thermo mechanical process, the thermal history in the friction stirred weld is simulated numerically. It is necessary that the model can be further to optimize the FSW process in order to minimize peak temperature within process window. The welding process was simulated using COMSOL MULTIPHYSICS software and developed thermal profile. Modeling and simulation of FSW has been a great challenge due to the complexity of the process. The results clears that an increase in the rotational speed and coefficient of friction causes increase in the peak temperature in workpeice. The simulation result is compared to available experimental results. According to results in steady state model, when tool is at center in process the temperature is not maximum at center but slightly front of the tool, this is due to preheating in the workpeice.

- by Taher Azdast
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- Materials Engineering, Mechanical Engineering, Materials Design, Fsw

Friction Stir Welding (FSW) was carried out on commercially available Aluminum Alloy 6063T-6 and AA 6061 plates, with dimensions of 150×75×6 mm. in my project we have selected dissimilar materials, especially on aluminum alloy 6061 and 6063-T6, Design of experiment (DOE) was applied to determine the most important factors which influence Ultimate Tensile Strength (UTS) of AA 6063 T-6 and AA 6061 joints produced by Friction Stir Welding (FSW). Effect of two factors which include tool rotational speed, welding speed. By Taguchi method using L9 orthogonal array, the optimum of process parameters was determined. GRA analysis was carried out to determine the percentage contribution of each factor on Tensile Strength. Particular emphasis has been given to the Effect of welding speed and tool rotation speed on welded work piece and study on mechanical properties.

- by vinayak malik
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- Engineering, Multidisciplinary, Finite Element Analysis (FEA), Abaqus
- by Editor IJTEMT
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- Mechanical Engineering, Tool, Material, Fsw

No society or community can escape the threat of HIV/AIDS. Manipur is one of the highest leading states of HIV/AIDS prevalence in India. The Tangkhul Naga society living in the hilly terrain of Ukhrul district Manipur, has the record of being the highest HIV/AIDS prevalence rate among the districts in the state. Many factors attribute to the increasing rate of HIV among this tribal society. The paper seeks to throw light on the current scenario of HIV prevalence in the district and draw relevance from the estimated data presented by the concern agencies with the prevailing scenario among the TangkhulNagas. The present study suggest mass screening as vital necessity along with intervention in a large scale among the general mass in order to bring out accurate data about HIV/AIDS prevalence in the district .

- by JASH MATHEW
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- HIV/AIDS, Prevalence, Fsw
- by Editor IJRET
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- Mechanical Engineering, Abaqus, Fsw
- by vinayak malik
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- Mechanical Engineering, Finite Element Analysis (FEA), Key words, Abaqus

Over the last twenty years Friction Stir Welding (FSW) has proven to be a very promising new joining technique. Especially high strength aluminium alloys can be welded with large advantages as compared to conventional fusion welding processes. Friction stir welding (FSW) of aluminium components using both fixed and variable gap bobbin tools has been demonstrated by several researchers, and reportedly these procedures were relatively easy to develop. Bobbin welds do not have an initial phase where the welding tool probe is plunged axially into the work piece as is done in conventional FSW. Bobbin welds are typically started by driving onto the edge of the plate or from a pre-drilled hole with an initially slow travel speed until plastic deformation starts, followed by acceleration of the travel speed to the final steady state value. The objective of current paper is to examine and summarize information for change in mechanical properties for bobbin tool friction stir welding (FSW) for joining materials. The findings presented, friction stir welding (FSW) with bobbin tool and parameter involved in it understand.

- by Kaushal Bhavsar
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- Fsw

This study examined pre-exposure prophylaxis (PrEP) acceptability among female sex workers, male-to-female transgendered persons and men who have sex with men in Lima, Peru. Focus groups explored social issues associated with PrEP acceptability and conjoint analysis assessed preferences among eight hypothetical PrEP scenarios with varying attribute profiles and their relative impact on acceptability. Conjoint analysis revealed that PrEP acceptability ranged from 19.8 to 82.5 out of a possible score of 100 across the eight hypothetical PrEP scenarios. Out-of-pocket cost had the greatest impact on PrEP acceptability (25.2, P < 0.001), followed by efficacy (21.4, P < 0.001) and potential side-effects (14.7, P < 0.001). Focus group data supported these findings, and also revealed that potential sexual risk disinhibition, stigma and discrimination associated with PrEP use, and mistrust of healthcare professionals were also concerns. These issues will require careful attention wh...

- by Jerome Galea
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- Medical Anthropology, Focus Groups, Gender and Sexuality, Medical Microbiology

The present paper discusses the modeling of tool geometry effects on the friction stir aluminum
welds using response surface methodology. The friction stir welding tools were designed with different
shoulder and tool probe geometries based on a design matrix. The matrix for the tool designing was made for
three types of tools, based on three types of probes, with three levels each for defining the shoulder surface
type and probe profile geometries. Then, the effects of tool shoulder and probe geometries on friction stirred
aluminum welds were experimentally investigated with respect to weld strength, weld cross section area, grain
size of weld and grain size of thermo-mechanically affected zone. These effects were modeled using multiple
and response surface regression analysis. The response surface regression modeling were found to be
appropriate for defining the friction stir weldment characteristics.
Keywords: friction stir welding (FSW); tool geometries; mechanical properties; microstructures; response
surface; regression modeling

- by Hrusikesh Mohanty
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- Fsw

Friction Stir Welding (FSW) is a solid state joining process which is gaining significance in many joining applications. The development in Finite element (FE) modeling is also aiding in widening the applicability of FSW by simulating the process for better understanding. The success of modeling of FSW depends on selection of suitable techniques and models/laws irrespective of any FE packages. The principal equations that govern modeling of FSW are the material model and the friction model. This paper aims at discussing the effect of variation in material and friction models on simulation output. It also highlights the modification required in friction model to get the realistic results from FSW simulations using ABAQUS.

- by Sanjeev N K and +1
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- Finite Element Analysis (FEA), Abaqus, Fsw

Resumo. O objetivo deste trabalho foi qualificar utilizando ensaios mecânicos de tração e dobramento o processo FSW (Friction Stir Welding) em juntas de topo nas uniões de chapas de alumínio AA 5083-O com 2 mm de espessura para posterior aplicação em carros de combate a incêndio. Foi utilizado o metal base alumínio, a liga AA 5083-O, braço robótico modelo YS165G3 e uma ferramenta de soldagem com ombro de 10 mm de diâmetro, contendo estrias em espiral com passe 3 mm e pino cônico com ponta de 2,9 mm, base 4 mm e comprimento de 1,6 mm com rosca M3 cônica. Os resultados mostraram que faltou penetração na raiz da soldagem, o que pode ser modificado aumentando a profundidade de penetração de ferramenta e aumento do comprimento do pino. Os testes de tração apresentaram uma média de tensão de escoamento de 127,3 MPa e média da tensão máxima de tração de 163,4 MPa. Foi possível obter uma solda contínua, sem rebarbas e com aparência superficial adequada por meio do processo FSW. Entretanto, devido a não penetração completa do pino da ferramenta na região soldada, houve a ruptura da solda, não podendo ser qualificada por este ensaio mecânico de tração.

- by Bruno Eduardo Bz
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- Fsw
- by Wilkister Ombidi
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- Biotechnology, Cancer, Infectious Diseases, Kenya

Abstract: Friction Stir Welding (FSW) is a relatively new joining process which is gaining significance in many joining applications. The development in Finite element (FE) modeling is also aiding in widening the applicability of FSW by simulating the process for better understanding. The success of modeling of FSW depends on selection of suitable techniques and models/laws irrespective of FE package used for simulation. The principal equations that govern modeling of FSW are the material model and the friction model. This paper aims at discussing the effect of variation in Coefficient of Friction (COF) on simulation outputs. It also highlights the modification required in friction model to get the realistic results from FSW simulations using ABAQUS.

- by vinayak malik
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- Key words, Abaqus, Fsw, Coefficient of Friction

The naval propeller is subjected to high cycling fatigue loadings and shocks. Besides, working in corrosive medium, cracks and, finally, fractures could be developed in different regions of the propeller. Because the zones of the propeller don’t work in similar conditions, the damage is not the same in all regions. The paper presents considerations about alloys for naval propellers, working conditions, wear and failure, reconditioning and testing of the naval propellers.

- by Elena Scutelnicu
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- Engineering, Fsw

Friction stir welding (FSW) is a solid state joining process which uses a rotating tool consisting of a shoulder and a pin/probe. The shoulder applies a downward pressure to the work piece surface, generates heat through the friction and leads to plasticization of materials in the vicinity of pin. During traverse the rotating tool mixes the adjacent material in the stir zone, creating a joint without fusion. The welding tool pin profile plays a major role in obtaining desirable weld. At present, research efforts are being made to gain a better understanding of the process, to explore different tool configurations, to optimize the set of process parameters and to widen the applicability of FSW and it variants. In this regard, having reliable finite element model that is capable of simulating FSW with minimal possible simulation time can turn out handy to reduce the number of physical experiments required in such studies and applications. The current work investigates a model based approach in knowing the effect of various tool pin profiles on temperature, stir zone and power consumed for welding. A three-dimensional (3-D) model is developed in finite element (FE) commercial code ABAQUS/Explicit using the Coupled Eulerian-Lagrangian (CEL) formulation, the Johnson-Cook material law and Coulomb's law of friction.The obtained results help in arriving at better tool designs.

- by Sanjeev N K and +1
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- Finite Element Analysis (FEA), Abaqus, Fsw
- by li lei
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- Mechanical Engineering, FEM, Temperature, FSW, vehicle detection
- by Ximena Salazar
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- Medical Anthropology, Sexuality, Gender and Sexuality, Gender
- by Suresh Hebbar
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- Engineering, Multidisciplinary, Finite Element Analysis (FEA), Abaqus
- by L. Langlois
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- Computer Science, Complex Geometry, Key words, Fsw

Friction stir welding (FSW) allows the joining of aluminum alloys in ways previously unattainable offering new manufacturing technology. Friction stir processing (FSP) of cast alloys such as Ni-Al bronze eliminates casting voids and improves the properties to that of wrought material. However, the local heating produced by both FSW and FSP can leave a fusion zone with reduced mechanical properties and a heat-affected zone with tensile residual stresses that can be deleterious to fatigue performance. Controlled plasticity burnishing (CPB) is an established surface treatment technology that has been investigated and described extensively for the improvement of damage tolerance, corrosion fatigue, and stress corrosion cracking performance in a variety of alloys. Mechanical CPB processing in conventional CNC machine tools or with robotic tool positioning is readily adapted to industrial FSW and FSP fabrication of components, either simultaneously or as a post process. CPB was applied to...

- by Paul Prevey
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- Materials Science, Stress corrosion cracking, Aluminum, Bronze

En agosto del 2007, PASMO realizo una encuesta TRaC relacionada a la prevencion del VIH/SIDA entre trabajadores sexuales femeninas (TSF) en cinco ciudades de Guatemala. La encuesta fue un seguimiento a una anterior sobre VIH/SIDA realizada en 2004 con TSF solamente en la ciudad de Guatemala. Los objetivos del estudio actual fueron: (1) monitorear las tendencias en el comportamiento y otros determinantes claves de Oportunidad, Habilidad y Motivacion (OHM) entre TSF en Guatemala desde el 2004, (2) identificar los factores que caracterizan a las trabajadoras sexuales femeninas que usan condones con sus clientes de forma consistente, y (3) evaluar el impacto del programa de PASMO en cuanto a comportamiento y los determinantes OHM

- by Occ Qoi
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- Quantitative, TRAC, USAID, Condom use
- by Samrand Rash-Ahmadi
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- Materials Engineering, Mechanical Engineering, Materials Design, Fsw
- by Jerome Galea
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- Medical Anthropology, Focus Groups, Sexuality, Gender and Sexuality