Search results for "Butt joint"

showing 10 items of 29 documents

AA6082-T6 Friction Stir Welded Joints Fatigue Resistance: Influence of Process Parameters

2006

In the paper the results of a wide range of experiments on friction stir welding (FSW) of aluminium alloys are reported. In particular, the AA6082-T6 butt joints fatigue resistance was investigated by varying the most relevant process parameters. In addition, a revolutionary pitch was utilized in order to investigate the effects of the tool rotating speed and the tool feed rate. Observations of the fracture insurgence were developed for different levels of applied load.

Materials scienceMechanical EngineeringProcess (computing)chemistry.chemical_elementWeldingfriction stir weldedIndustrial and Manufacturing Engineeringlaw.inventionFatigue resistancechemistryAluminiumlawButt jointFracture (geology)Friction stir weldingComposite materialSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria IndustrialeSettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
researchProduct

FSW of AA2139-T8 Butt joints for aeronautical applications

2011

The effect of process parameters on mechanical and microstructural properties of AA 2139 T8 joints produced by friction stir welding (FSW) was analysed by means of statistical tools. Three different parameters were taken into account: angular speed ( ω), welding speed ( va), and plunging depth ( p); each of them was varied on three levels. Forces and temperatures achieved during the welding were monitored and analysed for all joints. An accurate microstructural analysis was performed: the occurrence of some remarkable defects, typical of FSW, such as tunnel or lack of penetration, was related to actual process parameters adopted. The extension of each FSW characteristic zone was measured a…

Materials scienceMechanical Engineeringmicrostructuredesign of experimentAngular velocityWeldingmechanical propertiesMicrostructureIndentation hardnessfriction stirweldinglaw.inventionanalysis of the variancelawvisual_artUltimate tensile strengthFSW butt joints microstructureAluminium alloyvisual_art.visual_art_mediumButt jointaluminium alloyFriction stir weldingGeneral Materials ScienceComposite materialSettore ING-IND/16 - Tecnologie E Sistemi Di Lavorazione
researchProduct

Microstructural Changes Determining Joint Strength in Friction Stir Welding of Aluminium Alloys

2005

In the paper the results of a wide experimental activity on friction stir welding (FSW) of aluminum alloys are reported. In particular the butt joints of two different materials, namely AA1050-O and AA6082-T6 were considered. Grains dimensions and precipitates density were investigated both in the parent materials and after the welding processes. Furthermore post-welding heat treatments effects on the joint strength were studied.

Materials scienceMetallurgyGeneral Engineeringchemistry.chemical_elementWeldingMicrostructurelaw.inventionchemistryAluminiumlawButt jointFriction stir weldingComposite materialJoint (geology)Advanced Materials Research
researchProduct

Thermal Characterization of Friction Stir Welded Butt Joints

2005

In the paper the thermal characterization of friction stir welding processes (FSW) of aluminium alloys is presented. In particular both embedded thermocouples and a thermography analysis were utilized in order to acquire the temperature vs. time curves in point of interests of the joints and the temperature distributions, respectively. Such kind of results are very important in order to investigate the material conditions during the FSW process.

Materials scienceMetallurgyGeneral Engineeringchemistry.chemical_elementWeldinglaw.inventionCharacterization (materials science)chemistryAluminiumThermocouplelawThermographyButt jointFriction stir weldingFriction weldingComposite materialAdvanced Materials Research
researchProduct

On microstructural phenomena occurring in friction stir welding of aluminium alloys

2006

Abstract The results of experimental activity on friction stir welding (FSW) of aluminum alloys are reported. Butt joints of two different materials, namely AA2024-T4 and AA7075-T6, were investigated from a metallurgical point of view. Grain dimensions and insoluble particle densities were investigated both in the parent materials and in the joints. Furthermore, the effect of post-welding heat treatments on the joint strength was studied.

Materials scienceMetallurgyMetals and Alloyschemistry.chemical_elementWeldingMicrostructureIndustrial and Manufacturing EngineeringComputer Science Applicationslaw.inventionchemistrylawAluminiumModeling and SimulationCeramics and CompositesButt jointFriction stir weldingParticle6063 aluminium alloyComposite materialfriction stir weldingJoint (geology)Journal of Materials Processing Technology
researchProduct

Mechanical and metallurgical effects of in process cooling during friction stir welding of AA7075-T6 butt joints

2010

This paper presents the results of a combined experimental and numerical investigation focused on the effects of an in process water cooling treatment aimed at improving the final quality of friction stir welded butt joints in terms of mechanical resistance and metallurgy of the processed material. Micro and macro observations, together with the evolution of an already developed finite element tool, have been used to analyze specimens obtained under different process conditions. Water cooling was found to enhance joint strength, reducing the material softening usually observed in the thermo-mechanically affected zone area, with no detrimental effect on nugget integrity.

Materials sciencePolymers and PlasticsFriction stir weldingMetallurgyMetals and AlloysWeldingFinite element methodElectronic Optical and Magnetic Materialslaw.inventionIn process cooling treatmentslawCeramics and CompositesButt jointWater coolingFriction stir weldingFriction weldingFinite element modelingJoint (geology)SofteningSettore ING-IND/16 - Tecnologie E Sistemi Di Lavorazione
researchProduct

Residual stresses and FCP prediction in FSW through a continuous FE model

2009

Abstract Residual stresses prediction is definitively a relevant and open issue in welding processes. In the last years, different numerical models are proposed by many researchers to predict the residual stress field in FSW butt joint. However, most of these works are based on properly tuned analytical models and neglect the effect of the mechanical action due to the presence of the tool pin. In the present paper, a continuous 3D FE model, which was previously developed by some of the authors, was used to simulate the FSW process of butt joints with a single block approach, and predict the residual stress field by considering both thermal and mechanical actions. Then, the residual stress e…

Materials scienceTension (physics)business.industryFSW Residual stresses FEMMetals and AlloysNumerical modelsWeldingStructural engineeringIndustrial and Manufacturing EngineeringFinite element methodComputer Science Applicationslaw.inventionSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineResidual stresslawModeling and SimulationCeramics and CompositesButt jointFriction stir weldingFe modelbusinessSettore ING-IND/16 - Tecnologie E Sistemi Di Lavorazione
researchProduct

Material Flow in FSW of AA7075 - T6 butt joint: numerical simulations and experimental verifications

2006

Friction stir welding (FSW) has reached a large interest in the scientific community and in the recent years also in the industrial environment, owing to the advantages of such solid state welding process with respect to the classic ones. Advanced finite element method tools are needed in order to develop an effective engineering of the processes; quantitative results can be acquired from numerical simulations once the basic information such as the material flow is certain. A 3D Lagrangian implicit coupled rigid viscoplastic model has already been developed by the authors to simulate FSW of butt joints. In the present paper the material flow in the FSW of AA7075–T6 butt joints is investigat…

Materials scienceViscoplasticitybusiness.industrySolid-stateStructural engineeringCondensed Matter PhysicsFSW FEM MATERIAL FLOW TOOL GEOMETRYFinite element methodMaterial flowMetal flowWelding processButt jointFriction stir weldingGeneral Materials SciencebusinessSettore ING-IND/16 - Tecnologie E Sistemi Di Lavorazione
researchProduct

Experimental Characterization of FSW T-Joints of Light Alloys

2007

Welding is playing a growing role in transport industry due to relevant advantages it allows. Friction Stir Welding is considered one of the most promising joining technologies, especially when it is applied to light alloys. Focusing attention on FSW of T-joints, several parameters have to be considered, and due to thermo-mechanical features of process, T joints need a dedicated approach. A set of previously developed experiments has shown that the tilt angle plays a relevant role in the joint strength. Furthermore it should be observed that T-joints are very often utilized in aerospace industries since the produced structures are composed of joined skins and stingers. Numerous data are rep…

Materials sciencebusiness.industryFriction Stir Welding (FSW) Mechanical Property Microstructure T-JointMechanical EngineeringMetallurgyMechanical engineeringWeldinglaw.inventionCharacterization (materials science)Mechanics of MaterialslawT jointPerpendicularButt jointFriction stir weldingGeneral Materials ScienceFriction weldingfriction stir weldingAerospacebusinessSettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneJoint (geology)light alloysKey Engineering Materials
researchProduct

Numerical Procedure For Residual Stresses Prediction In Friction Stir Welding

2011

The prediction of residual stresses is a relevant and, under many points of view, still open issue for a proper welding process design. In the present paper a 3D FE model, with general validity for different joint configurations, was used to simulate the Friction Stir Welding (FSW) process of butt joints through a single block approach. The model is able to predict the residual stresses by considering thermal actions only, thanks to a new time efficient approach. A good agreement between calculated and experimentally measured data was found; the effectiveness of the presented numerical procedure was evaluated by comparing the calculation times of the proposed method with the ones of already…

Materials sciencebusiness.industryFriction stirweldingresidual stressesFEMApplied MathematicsMetallurgyGeneral EngineeringProcess (computing)Structural engineeringComputer Graphics and Computer-Aided DesignFinite element methodResidual stressThermalButt jointFriction stir weldingbusinessJoint (geology)Settore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneAnalysisBlock (data storage)
researchProduct