Microstructure and properties of electrically assisted stationary shoulder friction stir welded Ti6Al4V

2021 ◽  
pp. 1-12
Author(s):  
Yafeng Bai ◽  
Xiaoqing Jiang ◽  
Shujun Chen ◽  
Wang Jiang ◽  
Yang Han ◽  
...  
Keyword(s):  
Friction Stir ◽  
Microstructure And Properties ◽  
Stationary Shoulder ◽  
Electrically Assisted

scholarly journals Effect of Stirring Pin Rotation Speed on Microstructure and Mechanical Properties of 2A14-T4 Alloy T-Joints Produced by Stationary Shoulder Friction Stir Welding

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1938
Author(s):  
Haifeng Yang ◽  
Hongyun Zhao ◽  
Xinxin Xu ◽  
Li Zhou ◽  
Huihui Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Rotation Speed ◽  
Weld Nugget ◽  
Al Alloy ◽  
Nugget Zone ◽  
T Joints ◽  
Friction Stir ◽  
Stationary Shoulder ◽  
Microstructure And Mechanical Properties

In this study, 2A14-T4 Al-alloy T-joints were prepared via stationary shoulder friction stir welding (SSFSW) technology where the stirring pin’s rotation speed was set as different values. In combination with the numerical simulation results, the macro-forming, microstructure, and mechanical properties of the joints under different welding conditions were analyzed. The results show that the thermal cycle curves in the SSFSW process are featured by a steep climb and slow decreasing variation trends. As the stirring pin’s rotation speed increased, the grooves on the weld surface became more obvious. The base and rib plates exhibit W- or N-shaped hardness distribution patterns. The hardness of the weld nugget zone (WNZ) was high but was lower than that of the base material. The second weld’s annealing effect contributed to the precipitation and coarsening of the precipitated phase in the first weld nugget zone (WNZ1). The hardness of the heat affect zone (HAZ) in the vicinity of the thermo-mechanically affected zone (TMAZ) dropped to the minimum. As the stirring pin's rotation speed increased, the tensile strengths of the base and rib plates first increased and then dropped. The base and rib plates exhibited ductile and brittle/ductile fracture patterns, respectively.

Experimental Study of Stationary Shoulder Friction Stir Welded 7N01-T4 Aluminum Alloy

2016 ◽  
Vol 25 (3) ◽  
pp. 1228-1236 ◽  
Author(s):  
S. D. Ji ◽  
X. C. Meng ◽  
Z. W. Li ◽  
L. Ma ◽  
S. S. Gao
Keyword(s):  
Experimental Study ◽  
Aluminum Alloy ◽  
Friction Stir ◽  
Stationary Shoulder

Microstructure and Properties of Friction Stir Processed HY80 Steel

2013 ◽  
pp. 71-79 ◽  
Author(s):  
Garth W Young ◽  
William C Stewart ◽  
Murray W Mahoney ◽  
Russell Steel ◽  
Jon Babb ◽  
...  
Keyword(s):  
Friction Stir ◽  
Microstructure And Properties

scholarly journals A Comparative Investigation on Conventional and Stationary Shoulder Friction Stir Welding of Al-7075 Butt-Lap Structure

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1264 ◽  
Author(s):  
Yu Chen ◽  
Huaying Li ◽  
Xiaoyu Wang ◽  
Hua Ding ◽  
Fenghe Zhang
Keyword(s):  
Friction Stir Welding ◽  
Material Flow ◽  
Comparative Investigation ◽  
Flow Mode ◽  
Nugget Zone ◽  
Friction Stir ◽  
Stationary Shoulder ◽  
Average Grain Size ◽  
Al 7075

Both conventional friction stir welding (C-FSW) and stationary shoulder friction stir welding (S-FSW) were employed to join the Al-7075 butt-lap structure, then the microstructural evolution and mechanical characterization of all FSW joints were systematically studied. The C-FSW joint exhibited a rough surface with flashes and arc corrugations, while the surface of the S-FSW joint became smooth. Moreover, for the S-FSW joint, the shoulder-affected zone got eliminated and the material flow mode during FSW was changed owning to the application of stationary shoulder. Furthermore, in comparison to C-FSW, the lower welding heat input of S-FSW decreased the average grain size in the nugget zone and inhibited the coarsening of strengthening precipitates in the heat-affected zone, elevating the overall hardness for the S-FSW joint. In addition, the tensile strength of the S-FSW joint became higher compared to the C-FSW joint, and all the FSW joints failed inside the nugget zone attributing to the existence of hook defect. The sharp-angled hook defect deteriorated the plasticity of the C-FSW joint further, which was only 70% that of the S-FSW joint.

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