Comparative Analysis of the Mechanical Properties of Aluminum Alloys Welded Joints Obtained by Friction Stir Welding

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.

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Improving the Mechanical Properties of Aluminum Alloys 6061-T6 Friction Stir Welding Joints Using Ultrasonic Peening

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/881/1/012093 ◽

2020 ◽

Vol 881 ◽

pp. 012093

Author(s):

Abdul Mohsin Naji Almohaisen ◽

Kharia Salman Hassan

Keyword(s):

Mechanical Properties ◽

Friction Stir Welding ◽

Aluminum Alloys ◽

Friction Stir ◽

Ultrasonic Peening ◽

Welding Joints

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Evaluation of dissimilar joints properties of 5083-H12 and 6061-T6 aluminum alloys produced by tungsten inert gas and friction stir welding

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/1464420715595652 ◽

2015 ◽

Vol 231 (3) ◽

pp. 297-308 ◽

Cited By ~ 3

Author(s):

Morteza Ghaffarpour ◽

Mohammad Kazemi ◽

Mohammad Javad Mohammadi Sefat ◽

Ahmad Aziz ◽

Kamran Dehghani

Keyword(s):

Mechanical Properties ◽

Friction Stir Welding ◽

Aluminum Alloys ◽

Traverse Speed ◽

Inert Gas ◽

Dissimilar Joints ◽

Friction Stir ◽

Dissimilar Aluminum Alloys ◽

The Difference ◽

Welding Processes

In the present study, friction stir welding (FSW) and tungsten inert gas (TIG) techniques were used to join the dissimilar aluminum alloys of 5083-H12 and 6061-T6. The laboratory tests were designed using design of experiment (DOE) method. Variables for the FSW process were the rotational speed, traverse speed, shoulder diameter, and pin diameter. They changed in ranges of 700–2500 r/min, 25–400 mm/min, 10–14 mm, and 2–4 mm, respectively. In the case of TIG process, the variables were current intensity, traverse speed, and tilt angle. These parameters varied from 80 to 90 A, 200 to 400 mm/min, and 3° to 12°, respectively. The optimum amounts of parameters were obtained using response surface methodology (RSM). The RSM-based model was developed to predict ultimate tensile strength (UTS) of the welds produced. In FSW, the difference between predicted and measured UTS was about 1.28% and in TIG it was 1.78%. The good agreement between experimental and predicted results indicates the high accuracy of the developed model. Mechanical properties and also the microstructure of the welds were compared after optimizing both welding processes using RSM. The results showed that the welds produced by FSW indicated a considerably higher quality and also improved mechanical properties compared to TIG. Properties of the joints obtained by FSW in single-sided joints were more desirable. In the double-sided welds obtained by FSW these differences were of an even higher significance.

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