Structure-property characteristics of Al-Cu joint formed by high-rotation-speed friction stir lap welding without tool penetration into lower Cu sheet

2020 ◽  
Vol 57 ◽  
pp. 363-369
Author(s):  
Qilong Guan ◽  
Huijie Zhang ◽  
Huijie Liu ◽  
Qiuzhi Gao ◽  
Minglong Gong ◽  
...  
Keyword(s):  
Rotation Speed ◽  
Structure Property ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Lap Welding ◽  
High Rotation Speed

Effect of Tool Speeds during Friction Stir Lap Welding on Mode of Fracture and Fracture Strength of Al 6060-T5 Joints

2011 ◽  
Vol 275 ◽  
pp. 77-80 ◽  
Author(s):  
Shamzin Yazdanian ◽  
Zhan W. Chen ◽  
Guy Littlefair
Keyword(s):  
Fracture Strength ◽  
Welding Speed ◽  
Rotation Speed ◽  
Al Alloy ◽  
Zone Size ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
A Value ◽  
Maximum Value ◽  
Lap Welding

Friction stir lap welding (FSLW) of an age hardened Al alloy and evaluations of how FS speeds affected hooking and how hooking and softening due to FS affected fracture strength of the lap welds have been conducted. It was found that increasing rotation speed () and reducing welding speed (v) increased the stir zone size (AB-SZ) and also hook size (h), although a maximum value of h (hMax) reached. The features of hooks for the observed (,v)- AB-SZ-h relationships are presented and explained. It was found that when h increased to a value of ~ 0.9 mm (for the 3 mm alloy sheets), it started to invoke a significant effect on reducing fracture strength. Factors such as FS softening and insufficient joining, limited the fracture strength of the lap welds for small h values and these are presented and discussed.

Fracture Strengths of Mg Alloy AZ31B-H24 Friction Stir Lap Welds

2011 ◽  
Vol 275 ◽  
pp. 73-76 ◽  
Author(s):  
Zhan W. Chen ◽  
Shamzin Yazdanian ◽  
Guy Littlefair
Keyword(s):  
Stress Distribution ◽  
Fracture Strength ◽  
Rotation Speed ◽  
Mg Alloy ◽  
Welding Parameters ◽  
Friction Stir Lap Welding ◽  
Nugget Zone ◽  
Friction Stir ◽  
Lap Welding ◽  
Simulation Results

The effects of selected friction stir lap welding parameters on fracture strength of Mg alloy AZ31B-H24 welds have been studied. Rotation speed has been found to affect significantly the flow related hook size formation. Furthermore, fracture strength decreased almost linearly with hook size. A small amount of softening was detected in fracture location that was outside the nugget zone and thus this softening may only adversely affect the fracture strength slightly. Finally, simulation results are presented to show the uneven stress distribution in a lap geometry which together with the relative brittleness of the stir material must be the cause to have significantly reduced the fracture strength.

Equal-load-bearing joining of alclad AA2024-T4 alloy stringers and skins in aviation via friction stir lap welding

2021 ◽  
Vol 68 ◽  
pp. 1295-1302
Author(s):  
Xiangchen Meng ◽  
Bingqi Cao ◽  
Yang Qiu ◽  
Huizi Chen ◽  
Yuming Xie ◽  
...  
Keyword(s):  
Friction Stir Lap Welding ◽  
Load Bearing ◽  
Friction Stir ◽  
Lap Welding

Dissimilar Friction Stir Lap Welding of AA2198 and AA7075 Sheets: Forces, Microstructure and Mechanical Properties

2021 ◽  
Author(s):  
Antonello Astarita ◽  
Fausto Tucci ◽  
Alessia Teresa Silvestri ◽  
Michele Perrella ◽  
Luca Boccarusso ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welding Process ◽  
Processing Parameters ◽  
Processing Parameter ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Lap Shear ◽  
Microstructure And Mechanical Properties ◽  
Lap Welding ◽  
Factorial Design Of Experiments

Abstract This paper deals with the dissimilar friction stir lap welding of AA2198 and AA7075 sheets. The influence of processing parameters, namely welding speed and tool rotational speed on joint features, microstructure, and mechanical properties were investigated implementing a full factorial design of experiments. During the welding process, axial and transversal forces were continuously measured using a dedicated sensed fixture aiming at the correlation of this processing parameter with the quality of the achieved joints. The reported outcomes showed a very narrow processing window in which it was possible to avoid the formation of defects while the formation of an hook was observed for all the joints welded. The influence of the weld bead morphology on the lap shear strength was elucidated proving that the strength is ruled by the hook morphology. A correlation between the process parameters and the forces arising was also attempted. The final microstructure of the joints was studied and explained and also compared with the microhardness results.

Dissimilar friction stir lap welding of AA2198-AA6082: Process analysis and joint characterization

2021 ◽  
Vol 35 ◽  
pp. 753-764
Author(s):  
Fausto Tucci ◽  
Pierpaolo Carlone ◽  
Alessia Teresa Silvestri ◽  
Hetal Parmar ◽  
Antonello Astarita
Keyword(s):  
Process Analysis ◽  
Friction Stir Lap Welding ◽  
Friction Stir ◽  
Lap Welding

Friction Stir Lap Welding of Thin AA6061-T6 and AISI304 Sheets at Different Values of Pin Penetrations

2018 ◽  
Author(s):  
Raju Prasad Mahto ◽  
Surjya K. Pal
Keyword(s):  
Intermetallic Compound ◽  
Joint Strength ◽  
Detrimental Effect ◽  
Steel Substrate ◽  
Weld Strength ◽  
Steel Matrix ◽  
Friction Stir Lap Welding ◽  
Depth Of Penetration ◽  
Friction Stir ◽  
Lap Welding

The present paper focuses on the influence of pin penetration on joint strength achieved in friction stir lap welding between AA6061-T6 and AISI304. Penetration of pin into the steel substrate, which is placed below the aluminium, has an influencing role in achieving a good weld. Beyond a certain depth of penetration of pin into the steel, non-uniform thicker intermetallic compound and the weld defects have been found. Defects were found to be located in the stir zone. Thus, an excessive penetrations of the pin into the steel matrix has been produced a detrimental effect to the weld strength. An optimum penetration of pin has been experimentally found out.

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