Fabrication of large-bulk ultrafine grained 6061 aluminum alloy by rolling and low-heat-input friction stir welding

2018 ◽  
Vol 34 (1) ◽  
pp. 112-118 ◽  
Author(s):  
C.Y. Liu ◽  
B. Qu ◽  
P. Xue ◽  
Z.Y. Ma ◽  
K. Luo ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Heat Input ◽  
6061 Aluminum Alloy ◽  
Friction Stir ◽  
Large Bulk ◽  
Ultrafine Grained

Characterization o Solid-State Vortices Associated with the Friction-Stir Welding of Copper to Aluminum

1998 ◽  
Vol 4 (S2) ◽  
pp. 530-531
Author(s):  
R. D. Flores ◽  
L. E. Murr ◽  
E. A. Trillo
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Solid State ◽  
Weld Zone ◽  
Thick Plates ◽  
6061 Aluminum Alloy ◽  
Friction Stir ◽  
The Past ◽  
Joining Process

Although friction-stir welding has been developing as a viable industrial joining process over the past decade, only little attention has been given to the elucidation of associated microstructures. We have recently produced welds of copper to 6061 aluminum alloy using the technique illustrated in Fig. 1. In this process, a steel tool rod (0.6 cm diameter) or head-pin (HP) traverses the seam of 0.64 cm thick plates of copper butted against 6061-T6 aluminum at a rate (T in Fig. 1) of 1 mm/s; and rotating at a speed (R in Fig. 1) of 650 rpm (Fig. 1). A rather remarkable welding of these two materials results at temperatures measured to be around 400°C for 6061-T6 aluminum welded to itself. Consequently, the metals are stirred into one another by extreme plastic deformation which universally seems to involve dynamic recrystallization in the actual weld zone. There is no melting.

scholarly journals Flow Stress of 6061 Aluminum Alloy at Typical Temperatures during Friction Stir Welding based on Hot Compression Tests

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 804
Author(s):  
Sansan Ding ◽  
Qingyu Shi ◽  
Gaoqiang Chen
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Flow Stress ◽  
Hot Compression ◽  
Compression Tests ◽  
6061 Aluminum Alloy ◽  
Friction Stir ◽  
Artificial Neural

The purpose of this paper is to report quantitative data and models for the flow stress for the computer simulation of friction stir welding (FSW). In this paper, the flow stresses of the commercial 6061 aluminum alloy at the typical temperatures in FSW are investigated quantitatively by using hot compression tests. The typical temperatures during FSW are determined by reviewing the literature data. The measured data of flow stress, strain rate and temperature during hot compression tests are fitted to a Sellars–Tegart equation. An artificial neural network is trained to implement an accurate model for predicting the flow stress as a function of temperature and strain rate. Two models, i.e., the Sellars–Tegart equation and artificial neural network, for predicting the flow stress are compared. It is found that the root-mean-squared error (RMSE) between the measured and the predicted values are found to be 3.43 MPa for the model based on the Sellars–Tegart equation and 1.68 MPa for the model based on an artificial neural network. It is indicated that the artificial neural network has better flexibility than the Sellars–Tegart equation in predicting the flow stress at typical temperatures during FSW.

scholarly journals An integrated multiphysics model for friction stir welding of 6061 Aluminum alloy

2014 ◽  
Vol 8 (1) ◽  
pp. 29-48 ◽  
Author(s):  
M. Nourani ◽  
A. Milani ◽  
S. Yannacopoulos ◽  
C. Yan
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
6061 Aluminum Alloy ◽  
Friction Stir

Underwater friction stir welding of ultrafine grained 2017 aluminum alloy

2012 ◽  
Vol 19 (8) ◽  
pp. 2081-2085 ◽  
Author(s):  
Kuai-she Wang ◽  
Jia-lei Wu ◽  
Wen Wang ◽  
Long-hai Zhou ◽  
Zhao-xia Lin ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Friction Stir ◽  
Ultrafine Grained ◽  
Underwater Friction Stir Welding

Intergranular corrosion susceptibility of 6061 aluminum alloy welded joints

2021 ◽  
Vol 112 (8) ◽  
pp. 610-616
Author(s):  
Lihua Gong ◽  
Weimin Guo ◽  
Yang Li
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Welded Joints ◽  
Intergranular Corrosion ◽  
Inert Gas ◽  
6061 Aluminum Alloy ◽  
Friction Stir ◽  
Melted Zone ◽  
Metal Inert Gas Welding ◽  
Welding Joints

Abstract The intergranular corrosion behavior of 6061 aluminum alloy welded joints produced by metal inert gas welding and friction stir welding was studied. The microstructure of the welded joints and the intergranular corrosion morphology of the cross-section were analyzed by optical microscopy. The results show that the most sensitive area of intergranular corrosion is the partially melted zone of the metal inert gas welding, and the maximum corrosion depth is about seven times that of the base metal, followed by the unmixed zone. The heat affected zone has the lowest sensitivity. Although the welding seam corroded seriously, general corrosion played a leading role. With the high heat input of metal inert gas welding, the sensitivity to intergranular corrosion in the partially melted zone increased significantly, while other zones had little change. For friction stir welding joints, the heat affected zone suffered from the most severe corrosion, and the nugget zone the least. However, the difference is not apparent. The susceptibility to intergranular corrosion of friction stir welding joints is weaker than that of metal inert gas welding joints but more severe than the base metal.

Dissimilar friction-stir welding of 430 stainless steel and 6061 aluminum alloy: Microstructure and mechanical properties of the joints

2018 ◽  
Vol 233 (9) ◽  
pp. 1791-1801 ◽  
Author(s):  
Sirvan Zandsalimi ◽  
Akbar Heidarzadeh ◽  
Tohid Saeid
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Tensile Fracture ◽  
Welding Parameters ◽  
6061 Aluminum Alloy ◽  
Friction Stir ◽  
Tool Offset ◽  
430 Stainless Steel

The effect of friction-stir welding parameters on the microstructure and the mechanical properties of the dissimilar 430 stainless steel and 6061 aluminum alloy joints were investigated. Optical and scanning electron microscopes in conjunction with energy dispersive X-ray analysis were employed to study the microstructure of the joints. Tensile and microhardness tests were used to evaluate the mechanical properties. The results showed that the best appearance quality was achieved at a rotational speed of 900 r/min, a traverse speed of 120 mm/min, and a tool offset of zero. The tool offset was the most effective parameter affecting the weld quality. The stir zone of the joints had a composite structure in which the dispatched steel particles were distributed in aluminum. The best interface quality belonged to the joints welded at an offset of zero, which had a serrated nature with mechanical locking of the dissimilar parts. However, at negative and positive values of offsets, formation of voids and microcracks reduced the tensile properties of the joints. The tensile fracture of the joints occurred in the heat affected zone of the aluminum part, which had the lowest hardness amount between the microstructural zones. The fracture surfaces of the tensile specimens showed bimodal behavior.

Sign in / Sign up

Export Citation Format

Share Document