Partitioning evaluation of mechanical properties and the interfacial microstructure in a friction stir welded aluminum alloy/stainless steel lap joint

The mechanical properties and interfacial microstructure of slices of friction stir welded aluminum alloy/stainless steel dissimilar lap joints were characterized. In an FSWed A3003 aluminum alloy/SUS304 steel lap joint, the strength on the advancing side was larger than that at the retreating side. TEM observation indicated that a sound joint that fractured at the base metal can be obtained from the stage of the formation of the amorphous layer owing to the mechanical alloying effects before the formation of intermetallic compounds. This lap joining technique was also successfully applied to A6061/T6 aluminum alloy-grooved SUS304 plates. Equiaxed aluminum grains were observed at the interface of the specimen after it was fractured, indicating that the interface deformed only slightly during the microtensile test. It was found that tensile strength of the joint was increased by aging at 433K, considering that precipitation occurred at this temperature. In addition, it was confirmed that the joint heated at 723K for 1.8ks still fractured at the aluminum matrix, assuming that intermetallic layers at the interface would slightly grow in this heating condition.

Download Full-text

Interfacial Reaction during Dissimilar Friction Stir Lap Welding of Aluminum Alloy to Stainless Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.794-796.389 ◽

2014 ◽

Vol 794-796 ◽

pp. 389-394

Author(s):

Tomo Ogura ◽

Taichi Nishida ◽

Makoto Takahashi ◽

Hidehito Nishida ◽

Mitsuo Fujimoto ◽

...

Keyword(s):

Stainless Steel ◽

Aluminum Alloy ◽

Intermetallic Compounds ◽

Lap Joint ◽

Friction Stir Lap Welding ◽

Friction Stir ◽

Transmission Electron ◽

Lap Welding ◽

Mixed Layers ◽

Joining Process

A friction stir welded A3003 aluminum alloy /SUS304 stainless steel dissimilar lap joint was successfully produced. A sound joint that fractured at the base metal was obtained in the center region of the joint through the reaction layer of aluminum-rich intermetallic compounds with nanoorder thickness. The microstructural changes at the interface of the joint was examined by studying the hole left by the extracted welding tool produced at the end of the friction stir welding (FSW) bead using transmission electron microscopy (TEM). Mixed layers consisted of ultra-fined intermetallic compounds and stainless steel were observed. The stirred aluminum alloy flows onto the mixed layer after the tool transit and the joining was achieved. Based on the TEM observations, the joining process of the lap joint was also discussed.

Download Full-text

Microscale evaluation of mechanical properties of friction stir welded A6061 aluminium alloy/304 stainless steel dissimilar lap joint

Science and Technology of Welding & Joining ◽

10.1179/1362171812y.0000000098 ◽

2013 ◽

Vol 18 (2) ◽

pp. 108-113 ◽

Cited By ~ 34

Author(s):

T Ogura ◽

T Nishida ◽

Y Tanaka ◽

H Nishida ◽

S Yoshikawa ◽

...

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Aluminium Alloy ◽

304 Stainless Steel ◽

Lap Joint ◽

Friction Stir

Download Full-text

Investigation on Different Type of Defects, Temperature Variation and Mechanical Properties of Friction Stir Welded Lap joint of Aluminum Alloy 6101-T6

Materials Today Proceedings ◽

10.1016/j.matpr.2018.10.233 ◽

2018 ◽

Vol 5 (11) ◽

pp. 24378-24386 ◽

Cited By ~ 1

Author(s):

Sachindra Shankar ◽

Kanhaiya Saw ◽

Somnath Chattopadhyaya ◽

Sergej Hloch

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Temperature Variation ◽

Lap Joint ◽

Friction Stir

Download Full-text

Microstructure and Mechanical Properties of Friction Stir Welded Aluminum Alloy/Stainless Steel Lap Joints

ICAA13: 13th International Conference on Aluminum Alloys ◽

10.1002/9781118495292.ch94 ◽

2012 ◽

pp. 647-652

Author(s):

Tomo Ogura ◽

Taichi Nishida ◽

Hidehito Nishida ◽

Syuhei Yoshikawa ◽

Takumi Yoshida ◽

...

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Aluminum Alloy ◽

Lap Joints ◽

Friction Stir ◽

Microstructure And Mechanical Properties

Download Full-text

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

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/1464420718789447 ◽

2018 ◽

Vol 233 (9) ◽

pp. 1791-1801 ◽

Cited By ~ 5

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.

Download Full-text