Natural Aging Behavior Of Friction Stir Welded Al-Zn-Mg-Cu Aluminum Alloys

Kalemba, I.; Kopyściański, Mateusz; Hamilton, C.; Dymek, S.

doi:10.1515/amm-2015-0222

Cited by 7 publications

(6 citation statements)

References 14 publications

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“…Kalemba et al (2015) supportFuller et al (2010) results by showing the effect of natural ageing on AA7136 and AA7042. Here it was shown that natural ageing increases the tensile and hardness properties of the material, although the 'W' shape commonly found in 7xxx series alloy hardness plots was not altered Threadgill et al (2009).…”

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confidence: 80%

Investigation into the friction stir welding of thick section aluminium alloys

Brooks¹

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Friction stir welding (FSW) is a solid-state joining technology with a growing range of applications, many of them in safety critical service. These include aircraft wing spars and fusion reactor components, where the heat input associated with thick section components and long-term service performance are becoming increasingly important. However, there is a limited pool of published knowledge relating to FSW of thick section materials due to the previous industrial demand surrounding thin section welding. The primary aim of this research project was to investigate the influence of FSW using three different techniques joining 50 mm thick aluminium alloys AA5083-H111, AA6082-T651 and AA7050-T6451. These techniques, namely Weld-Flip-Weld (WFW), Simultaneous Double Sided (SDS) and Supported Stationary Shoulder (SSS) each have a different thermo-mechanical weld input and effect on the weld zone which have yet to be extensively investigated and quantified. The stir zone experienced large deformation and recrystallization resulting in an equiaxed and refined grain structure. Grain size was influenced by energy input with a greater input resulting in a larger grain structure. In each weld, constituent particles were identified with common elements of iron and aluminium being observed in all cases. Further particles of Mg2Si were found in AA5083 and AA6082 welds while Silica was recorded welds of AA7050. Simultaneous Double Sided FSW was shown to be an effective process and arguably the most appropriate for a wide range of industrial uses. In non-heat treatable AA5083 the process not only used less energy but also retained higher strength (298 MPa) than Weld-Flip-Weld (277 MPa). The retention of strength in the SDS weld in heat-treatable alloy AA7050 (352 MPa) and was not as high as that in the WFW weld (419 MPa), x however, coupled with the other benefits, such as faster production time and lower energy input, can be considered the most industrially suitable variant for AA7050- T7451.

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confidence: 80%

Investigation into the friction stir welding of thick section aluminium alloys

Brooks¹

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“…The friction stir welding (FSW) method, which was invented at The Welding Institute, Cambridge, UK, is a modern technology, enabling the welding and processing of various metallic materials [ 1 , 2 , 3 , 4 ]. FSW works by using a non-consumable tool to rotate and plunge into the interface of two workpieces.…”

Section: Introductionmentioning

confidence: 99%

The Object Segmentation from the Microstructure of a FSW Dissimilar Weld

et al. 2022

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Friction stir welding (FSW) is an environmentally friendly, solid-state welding technique. In this research work, we analyze the microstructure of a new type of FSW weld applying a two- stage framework based on image processing algorithms containing a segmentation step and microstructure analysis of objects occurring in different layers. A dual-speed tool as used to prepare the tested weld. In this paper, we present the segmentation method for recognizing areas containing particles forming bands in the microstructure of a dissimilar weld of aluminum alloys made by FSW technology. A digital analysis was performed on the images obtained using an Olympus GX51 light microscope. The image analysis process consisted of basic segmentation methods in conjunction with domain knowledge and object detection located in different layers of a weld using morphological operations and point transformations. These methods proved to be effective in the analysis of the microstructure images corrupted by noise. The segmentation parts as well as single objects were separated enough to analyze the distribution on different layers of the specimen and the variability of shape and size of the underlying microstructures, which was not possible without computer vision support.

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“…It is influenced by the welding parameters, type of tool, position of the materials in the joint (in the case of dissimilar weld seams), etc. [1,2]. One of the difficulties with the FSW process is that each of these factors has a major impact on the quality of a joint.…”

Section: Introductionmentioning

confidence: 99%

NON-INVASIVE ANALYSIS AND VISUALIZATION OF OBJECTS FROM FSW AlSi9Mg/2017A ALUMINUM ALLOY JOINTS

Wójcicka¹,

Mroczka²,

Kowalski³

2018

mafe

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Friction stir welding (FSW) technology allows for the welding of materials that differ in their chemical compositions, microstructures, and properties. When selecting the parameters, it is necessary to analyze the structure of a weld and eliminate the defects. The use of X-ray microtomography creates the possibility of precise imaging of a joint structure-especially when it contains defects (voids). The tests were carried out on an FSW joint made with both 2017A and AlSi9Mg aluminum alloys. The macrostructure was cross-sectional, and a defect was found in the middle part of the joint and on the advancing side. We used a conventional method of observation light microscopy. Then, an analysis was performed using X-ray microtomography, which revealed the shape of the defect in 3D. Individual cross-sections were extracted, which enabled us to measure the geometric quantities. A dependence was found for the shape of the defect on the welding parameters and the variability of its construction. The usefulness of this advanced material imaging technology for the analysis of FSW welds has been confirmed.

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Natural Aging Behavior Of Friction Stir Welded Al-Zn-Mg-Cu Aluminum Alloys

Cited by 7 publications

References 14 publications

Investigation into the friction stir welding of thick section aluminium alloys

Investigation into the friction stir welding of thick section aluminium alloys

The Object Segmentation from the Microstructure of a FSW Dissimilar Weld

NON-INVASIVE ANALYSIS AND VISUALIZATION OF OBJECTS FROM FSW AlSi9Mg/2017A ALUMINUM ALLOY JOINTS

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