Friction stir spot welding of AA6082-T6: Influence of the most relevant process parameters and comparison with classic mechanical fastening techniques

2007 ◽  
Vol 221 (7) ◽  
pp. 1111-1118 ◽  
Author(s):  
L Fratini ◽  
A Barcellona ◽  
G Buffa ◽  
D Palmeri
Keyword(s):  
Experimental Study ◽  
Process Parameters ◽  
Spot Welding ◽  
Joint Strength ◽  
Friction Stir Spot Welding ◽  
Friction Stir ◽  
Mechanical Fastening ◽  
Process Mechanics

The results of an experimental study on friction stir spot welding (FSSW) of AA6082-T6 are reported. In particular, process mechanics is highlighted and joint strength is considered in relation to varying the most relevant process parameters. Furthermore, the results obtained are compared with those derived from the application of traditional mechanical fastening techniques such as clinching and riveting. In this way the effectiveness of FSSW is highlighted.

Tool Path Design in Friction Stir Spot Welding of AA6082-T6 Aluminum Alloys

2007 ◽  
Vol 344 ◽  
pp. 767-774 ◽  
Author(s):  
Gianluca Buffa ◽  
Livan Fratini ◽  
Mario Piacentini
Keyword(s):  
Spot Welding ◽  
Joint Strength ◽  
Tool Path ◽  
Friction Stir Spot Welding ◽  
Material Microstructure ◽  
Friction Stir ◽  
Path Design ◽  
Local Material ◽  
Initial Penetration ◽  
Process Mechanics

In the paper, a variation of the Friction Stir Spot Welding (FSSW) process has been considered. In particular, a particular tool path is given after the sinking phase nearby the initial penetration site. The process mechanics was highlighted and the joint strength was considered at the varying of the most relevant process parameters. Furthermore macro and micro analyses were developed in order to highlight the process mechanics and the local material microstructure evolution. The investigated technology appears a promising joining technique in order to develop effective spot joints.

Simulative Model for the Evaluation of Thermo-Mechanical Effects in Friction Stir Spot Welding (FSSW) of Aluminum Sheets

2014 ◽  
Vol 622-623 ◽  
pp. 557-566
Author(s):  
G. D’Urso ◽  
Claudio Giardini
Keyword(s):  
Process Parameters ◽  
Spot Welding ◽  
Welding Process ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Local Pressure ◽  
Friction Stir ◽  
Welding Forces ◽  
Set Up ◽  
Simulative Model

A study was performed to evaluate how the Friction Stir Spot Welding process parameters affect both the thermal distribution in the welding region and the welding forces. An experimental campaign was performed by means of a CNC machine tool and FSSW lap joints on AA6060-T6 aluminum alloy plates having a thickness of 2+2 mm were executed. Five thermocouples were inserted into the samples at a specific distance from the specimen center. A set of tests was carried out by varying the process parameters, namely rotational speed, axial feed rate, plunging depth and dwell time. Axial welding forces were also measured during the execution of the experiments by means of a piezoelectric load cell. The experimental data collected were used to set up and to validate a simulative model of the process. In particular, a 2D FEM model was set up using the commercial code Deform 2D. A 2-dimensional FEM code was preferred in order to guarantee a very simple and practical model able to achieve results in a very short time. Since it is not possible to simulate the rotation of the tool in a 2D configuration, a specific external routine for the calculation of the developed thermal energy due to the friction between tool and workpiece was set up and implemented into the code starting from the local pressure distribution along the contact area.

Effects of process parameters on the lap joint strength and morphology in friction stir spot welding of ABS sheets

2020 ◽  
pp. 009524432096152
Author(s):  
Asil Ayaz ◽  
Aydin Ülker
Keyword(s):  
Spot Welding ◽  
Dwell Time ◽  
Joint Strength ◽  
Friction Stir Spot Welding ◽  
Welding Parameters ◽  
Shear Load ◽  
Lap Joint ◽  
Friction Stir ◽  
Joint Shear ◽  
Tool Rotation

In this study, a new method was proposed to reduce the keyhole volume with friction stir spot welding process and improve the lap joint shear load-carrying capacity of the weld by analyzing the effects of tool rotation speed, plunge depth and dwell time on the weld. Single lap shear tests were carried out to determine the influences of the welding parameters on the mechanical behavior of the welds. The quality of the joint was evaluated by examining the characteristics of the joint as a result of the lap joint shear load. For friction stir spot welding of the acrylonitrile butadiene styrene samples, the experiments were designed according to Taguchi’s L9 orthogonal array in a randomized way. From the analysis of variance and the signal-to-noise ratio, the significant parameters and the optimum combination level of the parameters were obtained. It was found that using a tool rotation of 1000 rpm, plunge depth 11.5 mm and dwell time of 40 s, an improved joint strength can be obtained. The results showed that joint strength was improved by an amount of 20% as compared with the optimum welding parameters to the initial welding parameters. Macrostructure examination plays an important role to determine the joint strength and evaluate the influences of each welding parameters. So, weld morphology was investigated by morphological analysis and visual comparisons. It was also observed failure modes for fractured samples having the highest, moderate and lowest lap joint shear load.

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