Journal ArticleDOI
Visualization of the material flow in AA2195 friction-stir welds using a marker insert technique
T. U. Seidel,Anthony P. Reynolds +1 more
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In this article, the material flow in solid-state, friction-stir, butt-welded AA2195-T8 was investigated using a marker insert technique (MIT).Abstract:
The material flow in solid-state, friction-stir, butt-welded AA2195-T8 was investigated using a marker insert technique (MIT). Markers made of AA5454-H32 were embedded in the path of the rotating friction stir welding (FSW) tool and their final position after welding was detected by metallographic means. Changes in material flow due to welding parameter and tool geometry variations were examined. The method provides a semiquantitative, three-dimensional view of the material transport in the welded zone. Because of the placement of markers at different positions at the weld centerline, the material transport in the longitudinal, transverse, and the vertical directions could be studied. Markers embedded in the path of the tool remain continuous after welding. The material transport, which is not symmetrical about the weld centerline, was such that the bulk of the material was transported to a position behind its original position. Superimposed on the primary motion of material in the horizontal plane of the weld is a circulation about the longitudinal axis of the weld. This circulation is found to increase with increasing weld energy.read more
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Friction Stir Welding and Processing
Rajiv S. Mishra,Zongyi Ma +1 more
TL;DR: Friction stir welding (FSW) is a relatively new solid-state joining process that is used to join high-strength aerospace aluminum alloys and other metallic alloys that are hard to weld by conventional fusion welding as discussed by the authors.
Journal ArticleDOI
Recent advances in friction-stir welding : Process, weldment structure and properties
TL;DR: In this article, the authors deal with the fundamental understanding of the process and its metallurgical consequences, focusing on heat generation, heat transfer and plastic flow during welding, elements of tool design, understanding defect formation and the structure and properties of the welded materials.
Journal ArticleDOI
Friction stir welding of aluminium alloys
TL;DR: A comprehensive body of knowledge has built up with respect to the friction stir welding (FSW) of aluminium alloys since the technique was invented in 1991 is reviewed in this article, including thermal history and metal flow, before discussing how process parameters affect the weld microstructure and the likelihood of entraining defects.
Journal ArticleDOI
Tensile properties and fracture locations of friction-stir-welded joints of 2017-T351 aluminum alloy
TL;DR: In this article, the relationship between welding parameters and tensile properties of the joints has been investigated and it was shown that the tensile property and fracture locations of the joint are significantly affected by the welding process parameters.
Journal ArticleDOI
Grain structure formation during friction stir welding observed by the ‘stop action technique’
TL;DR: In this article, the authors show that the grain refinement process is driven by grain subdivision at the colder periphery of the tools deformation zone, and the geometric effects of strain, which together reduce the overall high angle boundary spacing with increasing deformation.
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Journal ArticleDOI
Properties of friction-stir-welded 7075 T651 aluminum
TL;DR: Friction stir welding (FSW) was used to weld 7075 T651 aluminum, an alloy considered essentially unweldable by fusion processes as discussed by the authors, which exposed the alloy to a short time, high-temperature spike, while introducing extensive localized deformation.
Journal ArticleDOI
Visualisation of material flow in autogenous friction stir welds
TL;DR: In this article, material flow in friction stir welds has been visualised using embedded marker materials and the fidelity of the visualisation technique has also been demonstrated, showing that the friction stir welding process can be roughly described as an in situ extrusion process wherein the tool shoulder, the weld backing plate, and the cold base metal outside the weld zone form an extrusion chamber which moves relative to the workpiece.
Journal ArticleDOI
Solid-state flow visualization in the friction-stir welding of 2024 Al to 6061 Al
Journal ArticleDOI
Mikrostrukturelle, mechanische und korrosive Eigenschaften reibrührgeschweißter Stumpfnähte in Aluminiumlegierungen
TL;DR: In this paper, the microstructure of the weld seam and heat affected zone is characterised metallographically and by hardness measurements, and the corrosion properties reveal a certain sensitivity of the 2024-T3 joints to intergranular and exfoliation corrosion.