Microstructure evolution in dissimilar AA6060/copper friction stir welded joints

2017 ◽  
Author(s):  
T. A. Kalashnikova ◽  
M. A. Shvedov ◽  
P. A. Vasilyev
Keyword(s):  
Microstructure Evolution ◽  
Welded Joints ◽  
Friction Stir

Effects of tool shoulder geometry on mechanical properties and microstructure of friction-stir welded joints of AA5083-0 aluminium alloys

2020 ◽  
Vol 14 (4) ◽  
pp. 7507-7519
Author(s):  
Francisco Ortega ◽  
William Fernandez ◽  
Juan Felipe Santa ◽  
Jimy Unfried-Silgado
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Welding Speed ◽  
Welded Joints ◽  
Thermal History ◽  
Factors Affecting ◽  
Friction Stir ◽  
Tool Shoulder ◽  
History Of ◽  
Shoulder Geometry

Shoulder geometry is an important geometrical feature of tool design in friction stir welding since it has a strong effect on heat generation and material flow. In this paper the effect of shoulder geometry of tool on mechanical properties, microstructure evolution, and thermal history of friction stir welded joints of AA5083-O aluminium alloy. Two different shoulder geometries of tool named concave and featured (concentric circles) were used, both with cylindrical threaded pin. A set of samples were fabricated using a milling machine and a factorial experimental design to estimate the effects of process parameters (rotational and welding speed) and shoulder geometry on welded joints. Tensile strength, hardness, and microstructure evolution were experimentally measured. These observations were complemented with results obtained from a finite element modelling to calculate thermal history in welded joints. The results showed that the combination of revolution pitch R-value and shoulder geometry of tool were the most significant factors, affecting to mechanical properties, thermal behaviour, and microstructure evolution. The best tensile properties were obtained with a featured shoulder tool using 1400 rpm and 16 mm.min-1, and 1085 rpm and 11 mm.min-1 for rotational and welding speed. The same parameter combination resulted in a joint efficiency of 70% and 65%, respectively. In addition, the results of evaluation using an ANOVA analysis with fixed factors showed that increasing R-values produces statistically significant differences in ultimate strength (Sut) values.

scholarly journals Microstructure and Corrosion Behavior of the Friction Stir Welded Joints Made from Ultrafine Grained Aluminum

2017 ◽  
Vol 19 (7) ◽  
pp. 1600807 ◽  
Author(s):  
Marta Lipińska ◽  
Ewa Ura-Bińczyk ◽  
Lech Olejnik ◽  
Andrzej Rosochowski ◽  
Małgorzata Lewandowska
Keyword(s):  
Corrosion Behavior ◽  
Welded Joints ◽  
Friction Stir ◽  
Ultrafine Grained

Texture and Microstructure Evolution in Friction Stir Welded Cu-Al Sheets Characterized by EBSD

2011 ◽  
Vol 702-703 ◽  
pp. 574-577 ◽  
Author(s):  
Daniel Goran ◽  
G. Ji ◽  
M. N. Avettand-Fènoël ◽  
R. Taillard
Keyword(s):  
Microstructure Evolution ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Weld Interface ◽  
Friction Stir ◽  
Electron Backscatter ◽  
Ebsd Technique ◽  
Backscatter Diffraction

Texture and microstructure of FSW joined Al and Cu sheets were investigated by means of electron backscatter diffraction (EBSD) technique. The analysis has revealed a strong texture evolution on both sides of the weld interface as well as a very complex microstructure. Grains were found to be fully recrystallized on both sides of the weld and with different average diameters at different specific zones of the weld.

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