The Use of Bobbin Tools for Friction Stir Welding of Aluminium Alloys

2010 ◽  
Vol 638-642 ◽  
pp. 1179-1184 ◽  
Author(s):  
Philip L. Threadgill ◽  
M.M.Z. Ahmed ◽  
Jonathan P. Martin ◽  
Jonathan G. Perrett ◽  
Bradley P. Wynne
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Friction Stir Welding ◽  
Cross Section ◽  
Axial Force ◽  
Aluminium Alloys ◽  
Processing Parameters ◽  
Machine Design ◽  
Friction Stir ◽  
Triangular Zone

The use of a double sided friction stir welding tool (known as a bobbin tool) has the advantage of giving a processed zone in the workpiece which is more or less rectangular in cross section, as opposed the triangular zone which is more typically found when conventional friction stir welding tool designs are used. In addition, the net axial force on the workpiece is almost zero, which has significant beneficial implications in machine design and cost. However, the response of these tools in generating fine microstructures in the nugget area has not been established. The paper presents detailed metallographic analyses of microstructures produced in 25mm AA6082-T6 aluminium wrought alloy, and examines grain size, texture and mechanical properties as a function of processing parameters and tool design, and offers comparison with data from welds made with conventional tools.

Influence of Friction Stir Welding Variants on Crashworthiness of Friction Stir Welded Aluminium Top Hat Sections

2020 ◽  
Vol 979 ◽  
pp. 97-101
Author(s):  
A.K. Lakshminarayanan ◽  
Cyril Joseph Daniel
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Friction Stir Welding ◽  
Cross Section ◽  
Aluminium Alloys ◽  
Static Loading ◽  
Welding Process ◽  
Frontal Crash ◽  
Friction Stir ◽  
Related Defect

The motivation for this research is the desire to design a cross-section of frontal crash absorbing member that deforms in a regular controlled manner, but also the desire for cost-to-weight effectiveness. Nowadays, Friction Stir Welding (FSW) is a popular process for welding of difficult to weld aluminium alloys due to its advantages of solidification related defect free microstructure, low residual stress and comparable mechanical properties with the base metal. In order to better understand the crashworthiness of aluminium alloy joints produced by FSW, this investigation was carried out to fabricate a frontal member top hat section with base member welded by three different friction stir welding process variants. The crashworthiness was investigated by subjecting the fabricated joints to quasi static loading and the results are reported. The experimental results are compared with the results of numerical simulation.

scholarly journals Structural evaluation and mechanical properties of AZ31/SiC nano-composite produced by friction stir welding process at various welding speeds

2017 ◽  
Vol 233 (5) ◽  
pp. 831-841 ◽  
Author(s):  
A Abdollahzadeh ◽  
A Shokuhfar ◽  
H Omidvar ◽  
JM Cabrera ◽  
A Solonin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Friction Stir Welding ◽  
Grain Growth ◽  
Welding Process ◽  
Processing Parameters ◽  
Nano Particles ◽  
Homogeneous Distribution ◽  
Friction Stir ◽  
The Matrix

A metal matrix composite made of AZ31 containing SiC nano-particles was successfully produced by friction stir welding (FSW), and the effect of processing parameters such as rotational and transversal speeds on the microstructure (grain size) and mechanical properties (tensile and hardness tests) were investigated. Prior to friction stir welding, nano-sized SiC particles were incorporated into the joint line and then different rotational (600, 800 and 1000 r/min) and transversal speeds (25, 75, 125 and 175 mm/min) were tested. The results indicated that the grain size of the matrix and SiC nano-particles are two key parameters controlling different characteristics of the developed composite. Both parameters, in turns, are dependent on the heat generated during the FSW process. The increase of rotational speed and decrease of transversal speed result in high amount of heat and homogeneous distribution of SiC nano-particles. The former leads to grain growth and decrease of strength and hardness, while the latter causes grain refinement and increases of strength and hardness. Accordingly, the heat input has opposite effects on matrix grain growth and homogeneous distribution of particles. Therefore, optimum values of rotational and transversal speeds were found (800 r/min and 75 mm/min) to produce the best microstructure and mechanical properties.

scholarly journals Friction Stir Processing Of TIG And Friction Stir Welded Dissimilar Alloy Joints: A Review

2019 ◽  
Author(s):  
Sipokazi Mabuwa ◽  
Velaphi Msomi
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Friction Stir Processing ◽  
Aluminium Alloys ◽  
Food Packaging ◽  
Processing Technique ◽  
Tig Welding ◽  
Automotive Electronics ◽  
Friction Stir ◽  
Dissimilar Alloys

The use of aluminium alloys continues to grow in many applications to mention a few aerospace, automotive, electronics, electricity, construction and food packaging. With so much demand there is a new interest in welding of dissimilar aluminium alloys. Some of the welding techniques used to join dissimilar aluminium alloys include friction stir welding and TIG welding. The welding of dissimilar alloys affects the mechanical properties negatively due to porosity and cracking during the welding. This then suggests that there should be a process which can be used to improve the dissimilar alloys mechanical properties post its production. Friction stir processing was found to be one of the mechanical techniques that could be used to improve the mechanical properties of the material. This paper reports on the literature on the friction stir welding, TIG welding and friction stir processing techniques published so far, with the aim to identify the gap in the use of friction stir process as a post processing technique of the weld joints.

Effect of Tool pin Profile and Axial Force on Tensile Behavior in Friction Stir Welding of Dissimilar Aluminum Alloys

2011 ◽  
Vol 415-417 ◽  
pp. 1140-1146 ◽  
Author(s):  
R. Palanivel ◽  
P. Koshy Mathews ◽  
M. Balakrishnan ◽  
I. Dinaharan ◽  
N. Murugan
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Axial Force ◽  
Aluminium Alloys ◽  
Welding Process ◽  
Fusion Welding ◽  
Friction Stir ◽  
Tool Pin Profile ◽  
Dissimilar Aluminum Alloys ◽  
Tool Pin

Aluminium alloys generally has low weldability by traditional fusion welding process. The development of the Friction Stir Welding (FSW) has provided an alternative improved way of producing aluminium joints, in a faster and reliable manner. FSW process has several advantages, in particular the possibility to weld dissimilar aluminium alloys. This study focuses on the behavior of tensile strength of dissimilar joints of AA6351-T6 alloy to AA5083-H111 alloy produced by friction stir welding was analysed. Five different tool pin profile such as Straight Square (SS), Tapered Square (TS), Straight Hexagon (SH), Straight Octagon (SO) and Tapered Octagon (TO) with three different axial force (1tonne, 1.5tonne, 2 tonne) have been used to weld the joints. The effect of pin profiles and axial force on tensile properties and material flow behaviour of the joint was analyzed and it was found that the straight square pin profile with 1.5 tonne produced better tensile strength then other tool pin profile and axial force.

Investigation of Microstructure and Mechanical Properties of Friction Stir Lap Jointed Ni Base Superalloy

2012 ◽  
Vol 724 ◽  
pp. 481-485
Author(s):  
Kuk Hyun Song ◽  
Kazuhiro Nakata
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Friction Stir Welding ◽  
Base Material ◽  
Lap Joints ◽  
Stir Zone ◽  
Inconel 600 ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties ◽  
Average Grain Size

This study evaluated the microstructure and mechanical properties of friction stir welded lap joints. Inconel 600 and SS 400 as experimental materials were selected, and friction stir welding was carried out at tool rotation speed of 200 rpm and welding speed of 100 mm/min. Applying the friction stir welding was notably effective to reduce the grain size of the stir zone, as a result, the average grain size of Inconel 600 was reduced from 20 μm in the base material to 8.5 μm in the stir zone. Joint interface between Inconel 600 and SS 400 showed a sound weld without voids and cracks. Also, the hook, along the Inconel 600 alloy from SS 400, was formed at advancing side, which directly affected an increase in peel strength. In this study, we systematically discussed the evolution on microstructure and mechanical properties of friction stir lap jointed Inconel 600 and SS 400.

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