Micro- and Macro- Mechanical Properties of Pinless Friction Stir Welded Joints in AA5754 Aluminium Thin Sheets

Certain age hardenable alloys such as AA7475 cannot be joined with perfection using fusion welding techniques. This requires non-conventional welding technique such as friction stir welding process to join these ‘difficult to weld’ alloys. In this study, three different cooling conditions i.e. cryogenic, sub-zero, and zero-degree Celsius temperature conditions have been analyzed to understand its impact on the welding process. In-process cooling was found to behave effectively and also enhanced the mechanical properties of the welded joints. A stable microstructure was clearly seen in the images observed under the metallurgical microscope. The weld efficiencies were found to be good in each of the samples which are indicative of a strong metallic joint. The effective cooling conditions employed had an overall positive impact on the joint.

Download Full-text

Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of AA7039 aluminum alloy

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2011.10.054 ◽

2012 ◽

Vol 36 ◽

pp. 379-390 ◽

Cited By ~ 83

Author(s):

Chaitanya Sharma ◽

Dheerendra Kumar Dwivedi ◽

Pradeep Kumar

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Welded Joints ◽

Welding Parameters ◽

Friction Stir ◽

Microstructure And Mechanical Properties

Download Full-text

Effect of welding parameters on the microstructure and mechanical properties of the friction stir welded joints of a Mg-12Li-1Al alloy

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2017.07.071 ◽

2017 ◽

Vol 724 ◽

pp. 859-868 ◽

Cited By ~ 10

Author(s):

Seyed Alireza Askariani ◽

Hassan Pishbin ◽

Mahdi Moshref-Javadi

Keyword(s):

Mechanical Properties ◽

Welded Joints ◽

Welding Parameters ◽

Friction Stir ◽

Microstructure And Mechanical Properties

Download Full-text

Microstructure and Mechanical Properties of Friction Stir Welded Joints Between Commercially Pure Copper and Al 6351 Alloy

Archives of Metallurgy and Materials ◽

10.1515/amm-2017-0275 ◽

2017 ◽

Vol 62 (3) ◽

pp. 1819-1825

Author(s):

V.C. Sinha ◽

S. Kundu ◽

S. Chatterjee

Keyword(s):

Mechanical Properties ◽

Welded Joints ◽

Rotational Speed ◽

Pure Copper ◽

Stir Zone ◽

Tool Rotational Speed ◽

Friction Stir ◽

Commercially Pure ◽

Microstructure And Mechanical Properties ◽

Commercially Pure Copper

AbstractIn the present study, the effect of tool rotational speed on microstructure and mechanical properties of friction stir welded joints between commercially pure copper and 6351 Al alloy was carried out in the range of tool rotational speeds of 300-900 rpm in steps of 150 rpm at 30 mm/minutes travel speed. Up to 450 rpm, the interface of the joints is free from intermetallics and Al4Cu9intermetallic has been observed at the stir zone. However, Al4Cu9intermetallic was observed both at the interface and the stir zone at 600 rpm. At 750 and 900 rpm tool rotational speed, the layers of AlCu, Al2Cu3and Al4Cu9intermetallics were observed at the interface and only Al4Cu9intermetallics has been observed in the stir zone. The maximum ultimate tensile strength of ~207 MPa and yield strength of ~168 MPa along with ~6.2% elongation at fracture of the joint have been obtained when processed at 450 rpm tool rotational speed.

Download Full-text