Search results for "FRICTION STIR WELDING"

showing 10 items of 138 documents

Experimental and numerical analysis on FSWed magnesium alloy thin sheets obtained using “pin” and “pinless” tool

2012

Magnesium alloy thin sheets Friction Stir Welding pinless tool configuration FEMSettore ING-IND/16 - Tecnologie E Sistemi Di Lavorazione
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ELECTROCHEMICAL ANALYSIS ON FRICTION STIR WELDED AND LASER WELDED 6XXX ALUMINIUM ALLOYS T-JOINTS

2007

Friction Stir Welding (FSW) and Laser Welding (LW) can be successfully employed to weld aluminium alloys, in many cases overcoming the difficulties encountered with more conventional welding processes like MIG or TIG. The corrosion resistance of the welded joint remains, however, an important issue, especially in applications (like in aircrafts), where corrosion can induce structural failure: the weld region has often lower mechanical resistance in comparison with the parent material and a decrease in its corrosion resistance, especially when the corrosion damage can represent a potential crack initiation site, can be unacceptable in components design. In this work the corrosion resistance …

Materials processingMaterials scienceGeneral Chemical EngineeringMetallurgychemistry.chemical_elementGeneral ChemistryWeldingElectrochemistryLaserlaw.inventionCorrosionlaser beam weldingchemistryAluminiumlawaluminium alloysGeneral Materials Sciencefriction stir weldingCorrosion resistanceElectrochemistryJoints (structural components)Laser beam weldingSettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneCorrosion Reviews
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Using a neural network for predicting the average grain size in friction stir welding processes

2009

In the paper the microstructural phenomena in terms of average grain size occurring in friction stir welding (FSW) processes are focused. A neural network was linked to a finite element model (FEM) of the process to predict the average grain size values. The utilized net was trained starting from experimental data and numerical results of butt joints and then tested on further butt, lap and T-joints. The obtained results show the capability of the AI technique in conjunction with the FE tool to predict the final microstructure in the FSW joints.

Materials scienceArtificial neural networkFSW metallurgy neural networksMechanical EngineeringMetallurgyMicrostructureGrain sizeFinite element methodComputer Science ApplicationsLap jointModeling and SimulationButt jointFriction stir weldingGeneral Materials ScienceFriction weldingComposite materialSettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneCivil and Structural Engineering
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Continuous dynamic recrystallization phenomena modelling in friction stir welding of aluminium alloys: A neural-network-based approach

2007

The current paper focuses on the continuous dynamic recrystallization phenomena (CDRX) occurring in friction stir welding processes of AA6082 T6 aluminium alloys. In particular, in order to predict the average grain size, a properly trained neural network is linked to the finite element method (FEM) model of the process. The utilized net, which takes as inputs the local values of strain, strain rate, and temperature, was trained starting from experimental data and numerical results. The obtained results show the capability of the artificial intelligence (AI) technique in conjunction with the FE tool to predict the final microstructure in the joint section.

Materials scienceArtificial neural networkMechanical EngineeringMetallurgyMechanical engineeringRecrystallization (metallurgy)chemistry.chemical_elementStrain rateIndustrial and Manufacturing EngineeringFinite element methodchemistryAluminiumvisual_artAluminium alloyvisual_art.visual_art_mediumFriction stir weldingFriction weldingProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
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Mechanical and microstructural properties prediction by artificial neural networks in FSW processes of dual phase titanium alloys

2012

Abstract Friction Stir Welding (FSW), as a solid state welding process, seems to be one of the most promising techniques for joining titanium alloys avoiding a large number of difficulties arising from the use of traditional fusion welding processes. In order to pursue cost savings and a time efficient design, the development of numerical simulations of the process can represent a valid choice for engineers. In the paper an artificial neural network was properly trained and linked to an existing 3D FEM model for the FSW of Ti–6Al–4V titanium alloy, with the aim to predict both the microhardness values and the microstructure of the welded butt joints at the varying of the main process parame…

Materials scienceArtificial neural networkbusiness.industryStrategy and ManagementTitanium alloyWeldingStructural engineeringManagement Science and Operations ResearchMicrostructureIndustrial and Manufacturing EngineeringFinite element methodlaw.inventionFusion weldingFriction Stir Welding Titanium alloy Neural Networks FEMlawButt jointFriction stir weldingFriction Stir Welding Titanium alloys Neural networks FEMbusinessSettore ING-IND/16 - Tecnologie E Sistemi Di Lavorazione
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Experimental Comparison of the MIG and Friction Stir Welding Processes for AA 6005 Aluminium Alloy

2015

In this study, the mechanical properties of welded joints of AA 6005 aluminum alloy obtained with friction stir welding (FSW) and conventional metal inert gas welding (MIG) are studied. FSW welds were carried out on a semi-automatic milling machine. The performance of FSW and MIG welded joints were identified using tensile and bending impact tests, as far as the environmental aspects are also included in the discussion. The joints obtained with FSW and MIG processes were also investigated in their microstructure. The results indicate that, the microstructure of the friction stir weld is different from that of MIG welded joint. The weld nugget consists of small grains in FSW than those found…

Materials scienceBending (metalworking)Mechanical EngineeringMetallurgy6005 aluminium alloyWeldingMicrostructurelaw.inventionFlexural strengthMechanics of Materialslawvisual_artUltimate tensile strengthAluminium alloyvisual_art.visual_art_mediumFriction stir weldingGeneral Materials ScienceComposite materialKey Engineering Materials
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Comparative analysis of bonding mechanism in solid state metal working processes

2016

The Piwnik and Plata pressure-time bonding criterion was applied to Friction Stir Welding, Linear Friction Welding, Porthole Extrusion and Roll Bonding. A neural network was set up, trained and used to predict the bonding occurrence starting from the main field variable distributions calculated through specific numerical models developed for each process. The analysis of the results permitted to predict the occurrence of solid bonding and to highlight differences and analogies between the processes in order to obtain sound solid welds.

Materials scienceChemistry (all)Solid-stateProcess (computing)Mechanical engineeringRoll bondingMechanism (engineering)Engineering (all)lcsh:TA1-2040Friction stir weldingExtrusionFriction weldingMaterials Science (all)lcsh:Engineering (General). Civil engineering (General)Metal working
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Solid state bonding in extrusion and FSW: process mechanics and analogies

2006

Abstract The solid state bonding occurring in extrusion and in friction stir welding (FSW) processes is investigated through FEM models previously developed and validated. In particular, for the AA6082-T6 aluminum alloys, the most relevant field variables have been monitored and compared, such as strain, strain rate, effective stress and pressure. The aim of the research is the development of an effective FSW bonding criterion.

Materials scienceEffective stressMetallurgyMetals and AlloysSolid-statechemistry.chemical_elementSolid State BondingStrain rateIndustrial and Manufacturing EngineeringFinite element methodComputer Science ApplicationschemistryAluminiumModeling and SimulationScientific methodCeramics and CompositesFriction stir weldingExtrusionComposite material
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Friction stir welding of lap joints: Influence of process parameters on the metallurgical and mechanical properties

2009

Abstract Aluminum alloys are widely used in the aircraft industries even if such materials present lower ductility with respect to steels, anisotropy phenomena and, more important, they are often “difficult” to be welded or even “non-weldable”. In the last years the friction stir welding process (FSW) was proposed and applied in order to get good mechanical and technological performances of the joints. In this paper, an experimental and numerical investigation on the lap joining of AA2198-T4 aluminum alloy blanks by FSW is presented. In particular the joints strength and metallurgical properties are investigated by varying the joint configuration and the tool geometry and rotational speed. …

Materials scienceFSW FEM Lap-jointMechanical EngineeringAlloyMetallurgyRotational speedWeldingengineering.materialCondensed Matter Physicslaw.inventionLap jointMechanics of MaterialslawengineeringFriction stir weldingGeneral Materials ScienceDirect shear testDuctilitySettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneJoint (geology)Materials Science and Engineering: A
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Dissimilar material lap joints by Friction Stir Welding of Steel and Titanium Sheets: Process Modeling

2013

In the paper a continuum based FEM model for Friction Stir Welding of different material lap joint made out of thin stainless steel and titanium sheets is proposed. The simulation campaign was made out using the 3D Lagrangian implicit code DEFORM{trade mark, serif} by means of a rigid-visco-plastic approach. The model, already set up and tuned for FSW process of similar materials and geometrical configurations takes into account the different mechanical and thermal behavior of the two materials and the microstructural evolution of the considered titanium alloy in the same joint. Additionally, it is able to predict temperature, phase, strain and strain rate distributions and evolution at the…

Materials scienceFSW Titanium alloys Stainless steel FEM Lap jointsTitanium alloychemistry.chemical_elementWeldingStrain rateFinite element methodlaw.inventionLap jointchemistrylawFriction stir weldingComposite materialJoint (geology)Titanium
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