Effect of tool geometry on mechanical behavior of friction stir spot welds of polycarbonate sheets

2016 ◽  
Vol 88 (9-12) ◽  
pp. 3005-3016 ◽  
Author(s):  
F. Lambiase ◽  
A. Paoletti ◽  
A. Di Ilio
Keyword(s):  
Mechanical Behavior ◽  
Tool Geometry ◽  
Spot Welds ◽  
Friction Stir

Study on the new friction stir spot weld joint reinforcement technique on 5754 aluminum alloy

2017 ◽  
Vol 232 (17) ◽  
pp. 2976-2986 ◽  
Author(s):  
Hossein Andalib ◽  
Mohammadreza Farahani ◽  
Moeen Enami
Keyword(s):  
Process Parameters ◽  
Weld Joint ◽  
Spot Welding ◽  
Failure Load ◽  
Friction Stir Spot Welding ◽  
Spot Weld ◽  
Superior Performance ◽  
Tool Geometry ◽  
Spot Welds ◽  
Friction Stir

In this study, new friction stir spot welding method was developed using two different tools in order to create a spot weld without keyhole. The effects of process parameters and tool geometry were considered to improve the weld joint properties. The shear-tensile tests and microstructure study showed that the new method could offer superior performance in comparison to conventional friction stir spot welding. By controlling the process parameters, spot welds with strength about 37% higher than the conventional friction stir spot welds were obtained. The stir zone grain size of the prepared samples in the optimum welding conditions was decreased about four times than the base metal. It was observed that the tool plunge depth in both welding and refilling steps play a key role in creating a sound high strength welded joint. The failure load of the spot welds manufactured by concave shoulder was found to be about 7% higher than the failure load of the prepared spot welds by the flat shoulder.

scholarly journals Influence of Tool Geometry and Process Parameters on the Properties of Friction Stir Spot Welded Multiple (AA 5754 H111) Aluminium Sheets

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1157
Author(s):  
Danka Labus Zlatanovic ◽  
Sebastian Balos ◽  
Jean Pierre Bergmann ◽  
Stefan Rasche ◽  
Milan Pecanac ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Spot Welding ◽  
Minimum Energy ◽  
Tool Geometry ◽  
Friction Stir ◽  
Minimum Energy Consumption ◽  
Punch Test ◽  
Wide Range ◽  
Lap Welding

Friction stir spot welding is an emerging spot-welding technology that offers opportunities for joining a wide range of materials with minimum energy consumption. To increase productivity, the present work addresses production challenges and aims to find solutions for the lap-welding of multiple ultrathin sheets with maximum productivity. Two convex tools with different edge radii were used to weld four ultrathin sheets of AA5754-H111 alloy each with 0.3 mm thickness. To understand the influence of tool geometries and process parameters, coefficient of friction (CoF), microstructure and mechanical properties obtained with the Vickers microhardness test and the small punch test were analysed. A scanning acoustic microscope was used to assess weld quality. It was found that the increase of tool radius from 15 to 22.5 mm reduced the dwell time by a factor of three. Samples welded with a specific tool were seen to have no delamination and improved mechanical properties due to longer stirring time. The rotational speed was found to be the most influential parameter in governing the weld shape, CoF, microstructure, microhardness and weld efficiency. Low rotational speeds caused a 14.4% and 12.8% improvement in joint efficiency compared to high rotational speeds for both tools used in this investigation.

Microstructure and Mechanical Behavior of Friction-Stir-Welded 2017A-T451 Aluminum Alloy

2019 ◽  
Vol 72 (7) ◽  
pp. 1853-1868 ◽  
Author(s):  
O. Mimouni ◽  
R. Badji ◽  
A. Kouadri-David ◽  
R. Gassaa ◽  
N. Chekroun ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Mechanical Behavior ◽  
Friction Stir

scholarly journals Mechanical properties of friction stir welded butt joint of steel/aluminium alloys: effect of tool geometry

2017 ◽  
Vol 908 ◽  
pp. 012061 ◽  
Author(s):  
W. M. Syafiq ◽  
M. Afendi ◽  
R. Daud ◽  
M. N. Mazlee ◽  
M. S. Abdul Majid ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloys ◽  
Butt Joint ◽  
Tool Geometry ◽  
Friction Stir

Influence of Tool Geometry and Contact Condition on Friction Stir Welding of Al-Cu Laminated Composites

2013 ◽  
Vol 856 ◽  
pp. 16-21
Author(s):  
R. Beygi ◽  
Mohsen Kazeminezhad ◽  
A.H. Kokabi ◽  
S. Mohammad Javad Alvani ◽  
D. Verdera ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Material Flow ◽  
Laminated Composites ◽  
Flow Behavior ◽  
Tool Geometry ◽  
Contact Conditions ◽  
Friction Stir ◽  
Tool Geometries ◽  
Welding Procedure ◽  
Sem Analyses

In this study friction stir welding of Al-Cu laminated composites were carried out by two different tool geometries. Welding procedure was carried out from both sides of Al and Cu. Analyzing cross section of welds showed that different contact conditions between shoulder and material, offers different material flow behavior which is dependent on the tool geometry. SEM analyses showed that mixing of materials in nugget region is more pronounced in the advancing side. Also XRD results indicated that welding from Cu side, leads to intermetallic formation in mixed regions.

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