Effect of friction stir welding (FSW) parameters on strain hardening behavior of pure copper joints

Khodaverdizadeh, H.; Mahmoudi, A.H.; Heidarzadeh, Akbar; Nazari, E.

doi:10.1016/j.matdes.2011.09.058

Cited by 101 publications

(62 citation statements)

References 18 publications

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“…Due to the intense plastic deformation and high-temperature exposure within this zone during FSP, recrystallized fine grains appear in the stir zone of FSPed samples. In this region, fine equiaxed grains with a large fraction of high angle grain boundaries are formed as a result of dynamic recrystallization during FSP of copper which contains relatively low stacking fault energy (SFE) [28,29]. This phenomenon leads to the formation of the new nucleus within the processed zone which causes hindrance to grain growth.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

On the role of applying groove pressing technique before friction stir processing of copper: microstructure and mechanical evaluation

et al. 2018

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The effect of prior constrained groove pressing on friction stir processing (FSP) of pure copper was investigated. The results illustrate the development of high strain and strength of FSP samples along with an increased strength base metal as a result of applying for a prior constrained groove pressing (CGP) pass. The influences of further FSP passes on the microstructures, and mechanical properties were also shown. The microstructural evaluation of the specimens indicated up to 10 times grain size reduction in FSP specimens as well as equiaxed microstructural morphology. Mechanical properties of the specimens were carried out through tensile and microhardness tests. It was demonstrated that the FSP could improve the strength and ductility of the specimens simultaneously through improved mechanical properties of the base metal resulting from prior CGP. The performed calculations show that values of dislocation density of the CGPed specimens experienced significant change after applying for FSP passes.

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Section: Microstructural Evolutionmentioning

confidence: 99%

On the role of applying groove pressing technique before friction stir processing of copper: microstructure and mechanical evaluation

et al. 2018

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“…1) has gained attention in recent years; this method works by using a third body tool to join two facing surfaces (metals/alloys) [1][2][3]. Unlike conventional welding processes, FSW does not cause welding defects, such as distortion, heat-affected zone, cracking, porosity, and other defects [4][5][6][7][8]. Given these advantages, FSW has become a popular solid-state welding process with high tensile properties when joining two welded elements that comprise metals/alloys [9,10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the tensile properties of friction stir welded aluminum alloy joints based on axial force, traverse speed, and rotational speed

et al. 2016

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Friction stir welding (FSW) process has gained attention in recent years because of its advantages over the conventional fusion welding process. These advantages include the absence of heat formation in the affected zone and the absence of large distortion, porosity, oxidation, and cracking. Experimental investigations are necessary to understand the physical behavior that causes the high tensile strength of welded joints of different metals and alloys. Existing literature indicates that tensile properties exhibit strong dependence on the rotational speed, traverse speed, and axial force of the tool that was used. Therefore, this study introduces the experimental procedure for measuring tensile properties, namely, ultimate tensile strength (UTS) and tensile elongation of the welded AA 7020 Al alloy. Experimental findings suggest that a welded part with high UTS can be achieved at a lower heat input compared with the high heat input condition. A numerical approach based on genetic programming is employed to produce the functional relationships between tensile properties and the three inputs (rotational speed, traverse speed, and axial force) of the FSW process. The formulated models were validated based on the experimental data, using the statistical metrics. The effect of the three inputs on the tensile properties was investigated using 2D and 3D analyses. A high UTS was achieved, including a rotational speed of 1050 r/min and traverse speed of 95 mm/min. The results also indicate that 8 kN axial force should be set prior to the FSW process.

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“…porosity, cracking, blow holes which appear during conventional fusion welding process are avoided (Cavaliere, 2013;Kevorkijan, 2002;Khodaverdizadeh, Mahmoudi, Heidarzadeh, & Nazari, 2012;Kundu & Singh, 2016;Taban & Kaluc, 2006). In friction stir welding, high temperature below the melting point is attained through friction between tool shoulder and joining sheets as well as frictional heat produced by tool pin and the semi-solid material through the plastic flow of materials under the tool shoulder.…”

Section: Introductionmentioning

confidence: 99%

Friction stir welding: multi-response optimisation using Taguchi-based GRA

Kundu

Singh

2016

Production & Manufacturing Research

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In present experimental work, friction stir welding of aluminium alloy 5083-H321 is performed for optimisation of process parameters for maximum tensile strength. Taguchi's L 9 orthogonal array has been used for three parameters -tool rotational speed (TRS), traverse speed (TS), and tool tilt angle (TTA) with three levels. Multi-response optimisation has been carried out through Taguchi-based grey relational analysis. The grey relational grade has been calculated for all three responsesultimate tensile strength, percentage elongation, and micro-hardness. Analysis of variance is the tool used for obtaining grey relational grade to find out the significant process parameters. TRS and TS are the two most significant parameters which influence most of the quality characteristics of friction stir welded joint. Validation of predicted values done through confirmation experiments at optimum setting shows a good agreement with experimental values.

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Effect of friction stir welding (FSW) parameters on strain hardening behavior of pure copper joints

Cited by 101 publications

References 18 publications

On the role of applying groove pressing technique before friction stir processing of copper: microstructure and mechanical evaluation

On the role of applying groove pressing technique before friction stir processing of copper: microstructure and mechanical evaluation

Characterization of the tensile properties of friction stir welded aluminum alloy joints based on axial force, traverse speed, and rotational speed

Friction stir welding: multi-response optimisation using Taguchi-based GRA

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