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| Articles
by
Mokhtar Awang |
Total Records (
2 ) for
Mokhtar Awang |
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Umar Patthi
,
Mokhtar Awang
,
Faiz Ahmad
,
Ahmad Majdi Abdul Rani
,
Norbert Ezinger
and
Andreas Hutter
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Friction Stir Welding (FSW) is a relatively new joining technique and the application
of the technique is still limited. Among the advantages of this method compared
to the conventional welding techniques is that it reduces problem associated
to metal re-solidification as the technique involves no melting stages. Such
advantages are especially applicable for joining high strength aerospace material
such as aluminium Metal Matrix Composite (MMC). In this study, the physical
and mechanical properties of Friction Stir Welding (FSW) on aluminium 6092/SiC25p/T6
was discussed and established. Weld characteristic was analyzed using SEM, EDX
and XRD, while mechanical properties were analyzed using Vickers hardness and
tensile test. Weld microstructure observation shows distribution of fine and
coarse particle cross the weld area. Microstructure analysis reveals difference
in redistribution of particles between the zones in the weld area, which consist
of the weld centre, advancing and retreating side of the tool. XRD results depict
insignificant difference of post weld stresses as well as maintained material
phases. The weld centre shows increase in hardness and an adequate retainment
of the material strength. In conclusion FSW causes changes in the material microstructure
due to the onset of plastic deformation and the post weld result shows it does
retain or even improve some of the material properties. |
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Firouz Fadaeifard
,
Farhad Gharavi
,
Khamirul Amin Matori
,
Abdul Razak Daud
,
Mohd Khairol Anuar Mohd Ariffin
and
Mokhtar Awang
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Friction stir welding of Aluminum alloys has been increasingly
used in the industry on the ground of higher welding quality in comparison with
conventional methods. However, not enough studies have been done on a lap joint
of AA 6061-T6 which widely been used in aerospace industries. In this article,
friction stir lap welding of 6061-T6 aluminium alloy with 5 mm thickness was
carried out by using various welding speeds. The effect of welding speed on
microstructure, lap shear performance, micro hardness, failure mode and effective
plate thickness was investigated. Results showed that tensile shear strength
of weld increased by the rising welding speed. Rising welding speed caused hooking
and thinning approaches to two plate interfaces which in turn concluding in
higher tensile shear strength. The fracture surface of welds was analyzed by
field emission scanning electron microscopy (FE-SEM). Study of the fracture
surface of the nugget zone by EDX indicated the Fe compounds in that region. |
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