scholarly journals Investigation of Single-Pass/Double-Pass Techniques on Friction Stir Welding of Aluminium

2014 ◽  
Vol 7 ◽  
pp. 1053-1061 ◽  
Author(s):  
N.A.A. Sathari ◽  
◽  
L.H. Shah ◽  
A.R. Razali
Keyword(s):  
Friction Stir Welding ◽  
Double Pass ◽  
Friction Stir ◽  
Single Pass

Comparative Research on Damping Effects of Shock Absorders Relatively Made in Russian and China on the Fuel-Lubricating Oil Heat Exchanger of Aeroengine

2013 ◽  
Vol 791-793 ◽  
pp. 699-703 ◽  
Author(s):  
Kun Yu Yang ◽  
Hui Gan ◽  
Hong Yi Qu
Keyword(s):  
Aluminum Alloy ◽  
Comparative Research ◽  
Peel Strength ◽  
Lubricating Oil ◽  
Double Pass ◽  
Comparative Tests ◽  
Friction Stir ◽  
Single Pass ◽  
Aircraft Skin ◽  
Made In

To enhance the strength of the skin-stringer structures for aircraft, comparative tests between single-pass and double-pass welding by friction stir welding (FSW) were implemented. 1.8mm 2524-T3 aluminum alloy was used as the skin and 2.4mm 7150-T77511 aluminum alloy was used as the stringer with equilateral right-angle structure, and perfect joints without internal defects were obtained. Moreover, the tensile, peel and metallographic tests were implemented, and the results show that the average peel strength of double-pass FSW is 2 times or more than single-pass FSW. Therefore double-pass FSW can effectively improve the connection strength of aircraft skin and stringers structure.

scholarly journals Evaluation of the gap area between two sided friction stir welding of AA 2024-T351

2018 ◽  
Vol 7 (2) ◽  
pp. 296
Author(s):  
Hassan Mahdi ◽  
Moneer Tolephih ◽  
Nasri Namer
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Travel Speed ◽  
Joint Line ◽  
Double Pass ◽  
Friction Stir ◽  
Hardness Tests ◽  
Aa 2024 ◽  
Length Width ◽  
Aluminum Plates

The joints fabricated by two sided friction stir welding has shown higher ultimate tensile strength as compared to the joints fabricated by single pass and this trend is common for all the tool profiles.The joining of AA 2024-T351 aluminum plates with dimensions 200 mm ´ 200 mm ´ 5 mm (Length ´ width ´ thickness) was carried out by double pass friction stir welding (FSW) technique. Three friction stir welding tools with different pin height (1, 1.5 and 2) mm were used with different stirring rotation speeds and travel speed, (560, 710 and 900) RPM and (16, 20 and 25) mm/min respectively.The welded specimens were analyzed and evaluated using microstructure, macrostructure, tensile and hardness tests. The results indicated that the yield strength and tensile strength increases as the distance between the two passes (double pass) decrease, the rotational speed of 900 RPM and 560 RPM with travel speed of 16 mm/min and 25 mm/min, respectively is considered to be the most efficient and the width of the gap of the joint line decrease as the distance between the two welding pass decreases.

scholarly journals The Evolution of the Nugget Zone for Dissimilar AA6061/AA7075 Joints Fabricated via Multiple-Pass Friction Stir Welding

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1506
Author(s):  
Yu Chen ◽  
Zhihui Cai ◽  
Hua Ding ◽  
Fenghe Zhang
Keyword(s):  
Friction Stir Welding ◽  
Grain Refinement ◽  
Dissimilar Materials ◽  
Vertical Flow ◽  
Nugget Zone ◽  
Friction Stir ◽  
Single Pass ◽  
Multiple Pass ◽  
Welding Direction ◽  
Welding Technique

AA6061 and AA7075 aluminum alloys were successfully joined by using single-pass and multiple-pass friction stir welding techniques after which the effects on the nugget zone evolution from a second overlapping pass and its welding direction, were investigated. In comparison to single-pass friction stir welding, the application of a second overlapping pass prolonged the dynamic recrystallization time, and the grains of the nugget zone became finer with increased high angle grain boundaries. Moreover, reversing the welding direction of the second overlapping pass enhanced the vertical flow of materials, increasing the strain of the friction stir welding in the nugget zone. As a result, the efficiency of the grain refinement and mixture of dissimilar materials during the second overlapping pass were significantly elevated. The tensile strength of the nugget zone was improved after the second overlapping pass due to both the grain refinement and mechanical interlocking of the AA6061/AA7075 alloys. The nugget zone, which was fabricated via the multiple-pass friction stir welding technique using an opposite welding direction, exhibited a 23% increase in yield strength as compared to the sample using the single-pass friction stir welding technique.

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

2020 ◽  
Vol 17 (3) ◽  
pp. 8150-8159
Author(s):  
Kulwant Singh ◽  
Gurbhinder Singh ◽  
Harmeet Singh
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Mechanical Performance ◽  
Fuel Efficiency ◽  
Research Work ◽  
Grain Structure ◽  
Tensile Fracture ◽  
Friction Stir ◽  
The Impact

The weight reduction concept is most effective to reduce the emissions of greenhouse gases from vehicles, which also improves fuel efficiency. Amongst lightweight materials, magnesium alloys are attractive to the automotive sector as a structural material. Welding feasibility of magnesium alloys acts as an influential role in its usage for lightweight prospects. Friction stir welding (FSW) is an appropriate technique as compared to other welding techniques to join magnesium alloys. Field of friction stir welding is emerging in the current scenario. The friction stir welding technique has been selected to weld AZ91 magnesium alloys in the current research work. The microstructure and mechanical characteristics of the produced FSW butt joints have been investigated. Further, the influence of post welding heat treatment (at 260 °C for 1 h) on these properties has also been examined. Post welding heat treatment (PWHT) resulted in the improvement of the grain structure of weld zones which affected the mechanical performance of the joints. After heat treatment, the tensile strength and elongation of the joint increased by 12.6 % and 31.9 % respectively. It is proven that after PWHT, the microhardness of the stir zone reduced and a comparatively smoothened microhardness profile of the FSW joint obtained. No considerable variation in the location of the tensile fracture was witnessed after PWHT. The results show that the impact toughness of the weld joints further decreases after post welding heat treatment.

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