The friction stir welding process: an overview

Colligan, Kevin J.

doi:10.1533/9781845697716.1.15

Cited by 39 publications

(24 citation statements)

References 8 publications

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“…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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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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“…It is important that the workpieces should not spread or be lifted during the process; therefore, welding fixtures must be designed with features that are enable to achieve this objective. The quality of welding is dependent on the manufacturing precision of the clamping system and the welding table [4]. Moreover, the impact of clamping process on the joint performance should be recognized so that the required constant quality could be ensured.…”

Section: Introductionmentioning

confidence: 99%

A simplified design of clamping system and fixtures for friction stir welding of aluminium alloys

Hasan¹,

Ishak²,

Rejab³

2015

J. Mech. Eng. Sci.

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Sound friction stir welds could be attained by using an active design of backing/clamping system with a proper selection of the welding parameters. This work presented a simplified design of fixtures and backing plates to be used for friction stir welding of aluminum alloys. The test-rig was constructed to prevent dispersal or lifting of the specimens throughout the joining process and to ensure uniform distribution of temperature along the plates. The workpieces were subjected to uniform lateral and vertical pressures by means of bolts and nuts. Compound backing plates and pressure bars with additional side plates were included to increase the heat sink. Several coupons of dissimilar aluminum alloys AA7075 and AA6061 were joined to inspect the validity of this design. The tests showed promising results with defects-free welds, good strength and smooth surface finish without geometric imperfection and gap creation between the welded specimens. Efficiency of the joint reached its maximum value of about 82% with respect to the ultimate strength of the AA6061 alloy at 1100 rpm rotation speed and 300 mm/min feed. These results encourage using and improving the present design for future studies of friction stir welding.

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“…Friction stir welding (FSW), developed at The Welding Institute (TWI) in UK in 1991 [1,2], produces the required heat input for joining components by the friction occurring between a rotating tool and the workpiece. The tool consists of a conical steel pin, which dips into the material, and a cylindrical shoulder which only scratches the surface with a depth of less than 0.5 mm.…”

Section: Introductionmentioning

confidence: 99%

“…As the materials are only plasticized below the melting point, the weld is formed by mixing the materials due to the rotational movement of the pin, whereas almost all other established welding techniques produce a fusion zone. In this way, FSW has the advantage that problems like pore formation or hot cracking can be avoided, as no high temperature gradients or a liquid phase with the subsequent solidification process occur [1,3,4]. In addition, FSW is very flexible concerning the materials to be welded.…”

Section: Introductionmentioning

confidence: 99%

Spatially resolved positron annihilation spectroscopy on friction stir weld induced defects

Hain

Hugenschmidt

Pikart

et al. 2010

Science and Technology of Advanced Materials

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A friction stir welded (FSW) Al alloy sample was investigated by Doppler broadening spectroscopy (DBS) of the positron annihilation line. The spatially resolved defect distribution showed that the material in the joint zone becomes completely annealed during the welding process at the shoulder of the FSW tool, whereas at the tip, annealing is prevailed by the deterioration of the material due to the tool movement. This might be responsible for the increased probability of cracking in the heat affected zone of friction stir welds. Examination of a material pairing of steel S235 and the Al alloy Silafont36 by coincident Doppler broadening spectroscopy (CDBS) indicates the formation of annealed steel clusters in the Al alloy component of the sample. The clear visibility of Fe in the CDB spectra is explained by the very efficient trapping at the interface between steel cluster and bulk.

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The friction stir welding process: an overview

Cited by 39 publications

References 8 publications

Optimization of Welding Condition for Nonlinear Friction Stir Welding

Optimization of Welding Condition for Nonlinear Friction Stir Welding

A simplified design of clamping system and fixtures for friction stir welding of aluminium alloys

Spatially resolved positron annihilation spectroscopy on friction stir weld induced defects

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