Behavior of Oxide during Friction Stir Welding of Aluminum Alloy and Its Influence on Mechanical Properties.

Okamura, Hisanori; Aota, Kinya; Sakamoto, Masahiko; Ezumi, Makoto; Ikeuchi, Kenji

doi:10.2207/qjjws.19.446

Cited by 54 publications

(13 citation statements)

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“…The tensile properties and fracture locations of the joints are, to a large extent, dependent on the welding defects and hardness distributions of the joints, and which, in turn, on the welding parameters [6,11,14]. Figs.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the FSW process can be used to weld heat-treatable aluminum alloys in order to obtain high-quality joints [1][2][3][4]. However, many studies on the microstructural characteristics and mechanical properties of the friction-stir-welded joints have indicated that FSW gives rise to softening in the joints of the heat-treatable aluminum alloys such as 2014-T651 [5], 2024-T3 [6,7], 2024-T351 [8,9], 2024-T6 [10,11], 2195-T8 [12,13], 6061-T5 [14,15], 6061-T6 [8,[16][17][18], 6063-T5 [19][20][21], 6082-T5 [22], 7075-T651 [23] and 7475-T76 [7] because of the dissolution or growth of strengthening pre-cipitates during the welding thermal cycle, thus resulting in the degradation of the mechanical properties of the joints. Hence, it is important to study the effects of welding process parameters on the mechanical properties of the joints and determine the optimum welding parameters so as to obtain high-quality friction-stir-welded joints.…”

Section: Introductionmentioning

confidence: 99%

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Tensile properties and fracture locations of friction-stir-welded joints of 2017-T351 aluminum alloy

Liu

Fujii

Maeda

et al. 2003

Journal of Materials Processing Technology

442

187

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Friction stir welding (FSW) is a new and promising welding process that can produce low-cost and high-quality joints of heat-treatable aluminum alloys because it does not need consumable filler materials and can eliminate some welding defects such as crack and porosity. In order to demonstrate the friction stir weldability of the 2017-T351 aluminum alloy and determine optimum welding parameters, the relations between welding parameters and tensile properties of the joints have been studied in this paper. The experimental results showed that the tensile properties and fracture locations of the joints are significantly affected by the welding process parameters. When the optimum revolutionary pitch is 0.07 mm/rev corresponding to the rotation speed of 1500 rpm and the welding speed of 100 mm/min, the maximum ultimate strength of the joints is equivalent to 82% that of the base material. Though the voids-free joints are fractured near or at the interface between the weld nugget and the thermo-mechanically affected zone (TMAZ) on the advancing side, the fracture occurs at the weld center when the void defects exist in the joints.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tensile properties and fracture locations of friction-stir-welded joints of 2017-T351 aluminum alloy

Liu

Fujii

Maeda

et al. 2003

Journal of Materials Processing Technology

442

187

View full text Add to dashboard Cite

show abstract

“…When tool head turn to the A-side, tool traveling direction is mismatch tool rotational direction. This mismatch makes negative effect on material flow and fracturing Lazy-S. [11][12][13] It is encouraged to turn to same direction as tool rotational direction when welding direction change. The strength deteriorates at the specimen with continuous Lazy-S as Fig.…”

Section: Nonlinear Fsw Butt Joints (L-shape Butt Joints)mentioning

confidence: 99%

Optimization of Welding Condition for Nonlinear Friction Stir Welding

Takahara

Tsujikawa

Chung³

et al. 2008

Mater. Trans.

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The influence of nonlinear friction stir welding (FSW) tool control on joint properties was investigated. Although FSW is widely applied to linear joints, it is impossible for five-axis FSW machines to maintain all FSW parameters in optimum conditions during nonlinear welding. Nonlinear FSW joints should be produced according to an order of priority for FSW parameters. Tensile test results of butt joints with rectangular change in the welding direction on the plate plane (L-shape butt joints) change with various welding parameters. Results show that a turn to the retreating side is encouraged when the welding direction changes. The method of zero inclination tool angles is effective for nonlinear and plane welding.

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“…[3][4][5] Solid-state welding such as friction stir welding which utilizes frictional heat and plastic ow is an excellent joining method to join various aluminum alloy series such as the 5000, 6000 series and also the high strength aluminum alloys such as the 2000 and 7000 series. [6][7][8][9] Since the invention of TWI in 1991, continuous research and development have been done and the technology have been applied to various transportation equipment like aircraft and railway vehicles. Currently, research on structure formation resulted from frictional heat and plastic ow caused by the rotation of the tool, along with the mechanism are being conducted progressively.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of 2000 Series Aluminum Alloy Lap Joint Sheets by Magnetic Pulse Welding and Their Interfacial Microstructure Observations

2017

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Lap joint sheets of 2017-T3/2017-T3 and 2024-T3/2024-T3 were fabricated by magnetic pulse welding (MPW). Tensile shear tests were performed on the welded sheet, and a good lap joint was achieved at a discharge energy more than 3.0 kJ for both lap joint sheets. Weld interface showed wavy morphology when bonding at an adequate amount of discharge energy. Weld width of the lap joint sheets tend to increase with increasing of discharge energy. Collision speed calculated based on collision time was 211 m/s and estimated 1.5 GPa of the collision pressure at discharge energy of 3.5 kJ. SEM and EDS results showed that the weld interface exhibited no signi cant contrast of intermediate layer and oxides. A Metal jet was observed as aggregates of ne particles with size of less than 100 nm at the outside of bonded area. From TEM observation at the bonding interface, Al phases between yer and parent sheets had direct contact without the intervention of the oxide, and localized melting was not recognized. From these obtained results, good lap joint is attributed to true-contact of Al phases, an increasing of weld width, the anchor effect, and work hardening at weld interface.

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Behavior of Oxide during Friction Stir Welding of Aluminum Alloy and Its Influence on Mechanical Properties.

Cited by 54 publications

References 0 publications

Tensile properties and fracture locations of friction-stir-welded joints of 2017-T351 aluminum alloy

Tensile properties and fracture locations of friction-stir-welded joints of 2017-T351 aluminum alloy

Optimization of Welding Condition for Nonlinear Friction Stir Welding

Fabrication of 2000 Series Aluminum Alloy Lap Joint Sheets by Magnetic Pulse Welding and Their Interfacial Microstructure Observations

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