The influence of process parameters on mechanical properties and corrosion behavior of friction stir welded aluminum joints

Bocchi, Sara; Cabrini, Marina; D’Urso, Gianluca Danilo; Giardini, Claudio; Lorenzi, Sergio; Pastore, Tommaso

doi:10.1016/j.jmapro.2018.07.012

Cited by 62 publications

(35 citation statements)

References 33 publications

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“…Due to the considerable forces generated during an FSW welding, it was necessary to fix the sheets to be welded on a support plate through 6 grips, as reported in Figure 2. The welding parameters have been defined through a detailed bibliographic analysis, to obtain the best combination of rotational speed and feed rate for each alloy maximizing the mechanical characteristics of the welded joints [6,11,13,[29][30][31][32][33]. Table 3 shows the parameters used in the experimental campaign.…”

Section: Methodsmentioning

confidence: 99%

“…In the last decade, several research studies have been carried out to analyze the correlation between the friction stir welding process and the joint microstructure; this affects both the mechanical and metallurgical properties of the welded products [13][14][15][16]. With the aim of limiting these microstructural distortions inside the joint, other researchers have investigated the possibility of performing some post-welding heat treatments [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Cooling Conditions on Microstructure and Mechanical Properties of Friction Stir Welded Butt Joints of Different Aluminum Alloys

et al. 2019

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The aim of this work is to evaluate the difference between the properties of several aluminum alloy joints welded with the traditional air-cooled friction stir welding process and others obtained by the combination of the traditional friction stir welding setup with a water-cooling system. In particular, precipitation-hardening alloys AA2024-T3, AA6082-T6 and AA7075-T6, and a work-hardening alloy, AA5754-H111, were taken into account. From Rockwell and Vickers hardness maps, it was possible to observe a clear dependence of the hardness distribution on the cooling systems; joints obtained using a water-cooling system showed higher values of hardness, reached in the central zone and a narrow area interested by the hardness reduction for all the tested alloys. From tensile tests executed orthogonally to the welding direction, it was possible to observe that the alloys have responded differently in terms of ultimate tensile strength and final elongation when the water-cooling system was used. The microstructural analysis of the three precipitation-hardening alloys showed a larger average grain size in the nugget zones for the water-cooled condition. Moreover, in the thermo-mechanically altered zones of the water-cooled AA6082 and AA7075 joints, the grains were characterized by a smaller average size than the grains of the same air-cooled welds.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Cooling Conditions on Microstructure and Mechanical Properties of Friction Stir Welded Butt Joints of Different Aluminum Alloys

et al. 2019

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“…The protective properties of the welded joint of aluminium alloys inspire a great interest because of the intensive localized corrosion on its surface [ 6 , 7 , 8 , 9 , 10 , 11 ]. According to our earlier results [ 12 , 13 , 14 , 15 , 16 ] and works [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], the localized scanning electrochemical methods of the surface study, such as SVET and the scanning ion-selective electrode technique (SIET) are prospective methods for study of the kinetics and mechanism of the corrosion processes.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 1: Specificity of Development

et al. 2018

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This work consists of two parts. In the first part, the kinetics and mechanism of corrosion on the surface of the welded joint area of the aircraft 1579 aluminium alloy have been studied using SVET (scanning vibrating electrode technique) and SIET (scanning ion-selective electrode technique) in 0.5 M NaCl. The results have revealed the corrosion process development within the weld interface due to the presence of microdefects in the morphological structure. Features of the 1579 Al alloy corrosion have also been investigated through immersion experiments, quantitative analysis of dissolved alloying elements by means of atomic absorption spectroscopy, and corrosion products characterization using XRD (X-ray diffraction) analysis. The presence of Mg as an alloying element in the 1579 Al alloy sufficiently increases the bulk pH values as a result of the intensive dissolution of Mg. These factors accelerate the corrosion activity of the studied material in the 0.5 M NaCl solution. Corrosion evolution analysis of the 1579 Al alloy sample showed the importance of the coating formation to protect this alloy against corrosion and to increase the stability of this system in the corrosive media.

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“…This happened for the plastic deformation due to the stirring process of the tool pin and temperature generated during the friction. The coarser grains of BM became fine equiaxed at the NZ by recrystallization [31]. Through Heyn line intercept method [7] the average diameters of grain at various weld zones were measured and realized that the grains in NZ obtained by the severe stirring of the tool pin are finer than the grains in the other zones.…”

Section: Weld Bead Analysismentioning

confidence: 99%

Assessment of parameters windows and tool pin profile on mechanical property and microstructural morphology of FSWed AA2014 joints

2019

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The role of optimized parameters in deciding the qualities of the friction stir welded joint of 2014 aluminium alloy in terms of the mechanical properties and microstructural features was investigated in this research. A wide range of process parameters viz: tool shoulder diameter, tool pin profile, plunge depth, tool rotation speed and welding speed were selected and their individual effects on the tensile as well as microstructural properties variations were studied in detail. Out of four various selected tool pin profiles the excellent mechanical as well as microstructural properties of the square pin (SQ) tool are due to the unique stirring effect by the pulsating action of the sharp edge of the pin and metal propagation process at the stir area with incorporation with the tool rotation as well as welding speed during the friction stir welding. The SQ pin tool of 24 mm shoulder diameter with a plunge depth of 0.06 mm and tool rotating at 815 rev/mm with welding performed at a speed of 63 mm/min yielded the best quality joint. The ultimate tensile strength is around 86% of the base metal (BM) with excellent metallurgical characteristics contributed by the 84% finer grains than the BM ensured from the detail microstructural analysis of the weld bead. The metallurgical study includes the variations in the grain size at the nugget zone with respect to the selected process parameters as well. Fractography of the welded specimen reveals a ductile and transgranular mode with cup and cone structures on the counterpart.

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The influence of process parameters on mechanical properties and corrosion behavior of friction stir welded aluminum joints

Cited by 62 publications

References 33 publications

Effects of Cooling Conditions on Microstructure and Mechanical Properties of Friction Stir Welded Butt Joints of Different Aluminum Alloys

Effects of Cooling Conditions on Microstructure and Mechanical Properties of Friction Stir Welded Butt Joints of Different Aluminum Alloys

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 1: Specificity of Development

Assessment of parameters windows and tool pin profile on mechanical property and microstructural morphology of FSWed AA2014 joints

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