Effect of rotation speed on nugget structure and property of high rotation speed friction stir welded Al-Mn aluminum alloy

Abstract Aluminum alloy and steel composite structures are increasingly and widely used in the automotive industry and other fields owing to their advantages of light weight and high comprehensive performance. The high-quality joining of aluminum alloy and steel has become the research focus in China and overseas. The current study proposes a probeless friction stir extrusion joining (P-FSEJ) process to avoid intermetallic compounds, reduce wear of tools, and obtain a spot joint without keyhole defects. Strong mechanical interlock is formed after that the plasticized aluminum alloy (AA) 6061-T6 is extruded into the prefabricated threaded hole of a Q235 steel plate in the P-FSEJ process. Three distinct zones in the typical symmetrical “basin-shaped” P-FSEJed joint are observed. In addition to the rotation speed, the diameter of the threaded hole is also specifically used to study the influence on the mechanical properties of the joint. When the rotation speed is 1200 rpm, the maximum tensile-shear loads of the M6 and M7 threaded hole joints are 2882.93 N and 3344.74 N, respectively, while the M8 threaded hole joint is 4139.58 N at rotation speed of 1000 rpm. Two typical fracture failure modes of the P-FSEJed joints, namely, rivet shear and rivet pullout-shear fractures, are obtained under tensile-shear loading. Lastly, the P-FSEJed joints with mode “P” fracture failure generally have high strength and energy absorption capability.

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Influence of Friction Stir Processing Parameters on Anisotropic Behavior Property of 5086-O Aluminum Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.702-703.348 ◽

2011 ◽

Vol 702-703 ◽

pp. 348-351

Author(s):

Shivanna Pradeep ◽

Sumit Kumar Sharma ◽

Vivek Pancholi

Keyword(s):

Aluminum Alloy ◽

Friction Stir Processing ◽

Rotation Speed ◽

Base Material ◽

Processing Parameters ◽

Mechanical Anisotropy ◽

Al Alloy ◽

Anisotropic Behavior ◽

Planar Anisotropy ◽

Friction Stir

In the present work, 5086 Al alloy is subjected to single and multi pass friction stir processing (FSP) to modify microstructure and mechanical anisotropy. The processing is carried out at constant rotation speed of 1025 rpm and different traverse speeds of 30 mm/min and 50 mm/min with and without cooling. Mechanical anisotropy is evaluated in terms of normal and planar anisotropy by performing tensile test in 0, 45 and 90o direction to processing direction. Material processed using multi pass FSP at 30 mm/min is showing lower planar anisotropy as compared to base material. The mechanical anisotropy property is correlated with the development of micro texture.

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Effects of rotation speed of assisted shoulder on microstructure and mechanical properties of 6061-T6 aluminum alloy by dual-rotation friction stir welding

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-018-2570-0 ◽

2018 ◽

Vol 100 (1-4) ◽

pp. 199-208 ◽

Cited By ~ 9

Author(s):

L. Zhou ◽

R. X. Zhang ◽

X. Y. Hu ◽

N. Guo ◽

H. H. Zhao ◽

...

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Friction Stir Welding ◽

Rotation Speed ◽

Friction Stir ◽

Microstructure And Mechanical Properties ◽

Effects Of Rotation ◽

Dual Rotation

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Influences of Pin Shape on a High Rotation Speed Friction Stir Welding Joint of a 6061-T6 Aluminum Alloy Sheet

Metals ◽

10.3390/met8120987 ◽

2018 ◽

Vol 8 (12) ◽

pp. 987 ◽

Cited By ~ 5

Author(s):

Yang Zhou ◽

Shujin Chen ◽

Jiayou Wang ◽

Penghao Wang ◽

Jingyu Xia

Keyword(s):

Friction Stir Welding ◽

Aluminium Alloy ◽

Rotation Speed ◽

Alloy Sheet ◽

Aluminum Alloy Sheet ◽

Welding Quality ◽

Nugget Zone ◽

Friction Stir ◽

High Rotation Speed ◽

S Curve

In order to explore the influences of different pins on the weld based on the specialty of the aluminium alloy sheet welding, three kinds of pins were chosen to perform high rotation speed friction stir welding on a 1 mm thick 6061-T6 aluminium alloy in this study. The microstructure and mechanical properties of the joints were analysed at the same time. When the rotation speed was 11,000 rpm and the welding speed was 300 mm/min, more sufficient stirring and a better joint (the tensile strength reaches 87.2% of the base metal) can be obtained with the pin design of a quadrangular frustum pyramid. The pattern of the weld cross section was a “flat T” and no obvious “S curve” was found in nugget zone (NZ). Heat affected zone (HAZ) and thermo-mechanically affected zone (TMAZ) were also narrow. The results demonstrate that the proportion of low angle boundaries in each area of the weld is lower than that of traditional Friction Stir Welding (FSW). The grain size of NZ is significantly refined and the proportion of low angle boundaries is only 20.1%, which have improved the welding quality.

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