Effect of heat treatment on tensile properties of friction stir welded joints of 2219-T6 aluminium alloy

2006 ◽  
Vol 22 (2) ◽  
pp. 237-241 ◽  
Author(s):  
H. J. Liu ◽  
Y. C. Chen ◽  
J. C. Feng
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
Tensile Properties ◽  
Welded Joints ◽  
Friction Stir

Effects of Tool Pin Profile and Tool Shoulder Diameter on the Tensile Behaviour of Friction Stir Welded Joints of Aluminium Alloys

2014 ◽  
Vol 984-985 ◽  
pp. 586-591 ◽  
Author(s):  
R. Ashok Kumar ◽  
M.R. Thansekhar
Keyword(s):  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Tensile Properties ◽  
Welded Joints ◽  
Tensile Behaviour ◽  
Light Weight ◽  
Friction Stir ◽  
Tool Shoulder ◽  
Shoulder Diameter ◽  
Weight Structures

— For fabricating light weight structures, it requires high strength-to weight ratio. AA6061 aluminium alloy is widely used in the fabrication of light weight structures. A356 aluminium alloy has wide spread application in aerospace industries. Friction stir welding is solid state joining process which is conducting for joining similar and dissimilar materials. The friction stir welding parameters play an important role for deciding the strength of welded joints. In this investigation, A356 and AA6061 alloys were friction stir welded by varying triangular, square, hexagonal pin profiles of tool keeping the remaining parameters same and AA6061 alloys were friction stir welded by varying tool shoulder diameter as 12mm,15mm,18mm without changing other parameters. Tensile properties of each joint have been analyzed microscopically. From the experimental results, it is observed that hexagonal pin profiled tool and 15mm shoulder diameter tool provides higher tensile properties when compared to other tools.

Influences of post weld heat treatment on tensile properties of friction stir welded AA2519-T87 aluminium alloy joints

2015 ◽  
Vol 24 (5-6) ◽  
pp. 195-205 ◽  
Author(s):  
S. Sree Sabari ◽  
V. Balasubramanian ◽  
S. Malarvizhi ◽  
G. Madusudhan Reddy
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Aluminium Alloy ◽  
Tensile Properties ◽  
Post Weld Heat Treatment ◽  
Precipitate Size ◽  
Potential Candidate ◽  
Friction Stir ◽  
Weld Heat

AbstractAA 2519-T87 is an aluminium alloy that principally contains Cu as an alloying element and is a new grade of Al-Cu alloy system. This material is a potential candidate for light combat military vehicles. Fusion welding of this alloy leads to hot cracking, porosity and alloy segregation in the weld metal region. Friction stir welding (FSW) is a solid state joining process which can overcome the above mentioned problems. However, the FSW of age hardenable aluminium alloys results in poor tensile properties in the as-welded condition (AW). Hence, post weld heat treatment (PWHT) is used to enhance deteriorated tensile properties of FSW joints. In this work, the effect of PWHT, namely artificial ageing (AA) and solution treatment (ST) followed by ageing (STA) on the microstructure, tensile properties and microhardness were systematically investigated. The microstructural features of the weld joints were characterised using an optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The tensile strength and microhardness of the joints were correlated with the grain size, precipitate size, shape and its distribution. From the investigation, it was found that STA treatment is beneficial in enhancing the tensile strength of the FSW joints of AA2519-T87 alloy and this is mainly due to the presence of fine and densely distributed precipitates in the stir zone.

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