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Articles by Mokhtar Awang
Total Records ( 2 ) for Mokhtar Awang
  Umar Patthi , Mokhtar Awang , Faiz Ahmad , Ahmad Majdi Abdul Rani , Norbert Ezinger and Andreas Hutter
  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.
  Firouz Fadaeifard , Farhad Gharavi , Khamirul Amin Matori , Abdul Razak Daud , Mohd Khairol Anuar Mohd Ariffin and Mokhtar Awang
  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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