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논문 기본 정보

자료유형
학술저널
저자정보
Mohammed Ubaid (Jamia Millia Islamia) Dhruv Bajaj (Jamia Millia Islamia) A. K. Mukhopadhyay (Defence Metallurgical Research Laboratory) Arshad Noor Siddiquee (Jamia Millia Islamia)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.12
발행연도
2020.1
수록면
1,841 - 1,860 (20page)

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초록· 키워드

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Friction stir welding (FSW) of thick aluminium sections will pave way for remarkable new defence applications, providedthe accompanying challenges are successfully addressed. These challenges include elimination of tunnel defects, loss ofstrength in heat-treatable aluminium alloys, tool design and excessive process forces. Accounts of defect elimination, detailedmicro-structural and mechanical characterization for thick section FSW are scarce in the published literature. Further, specialstrategies such as bobbin tool, pre-drilled hole for plunging and inverted double pass are generally deployed to overcomethese challenges. This makes the process less productive and complex. In the present work, armor grade aluminum alloyAA2519-T87 plates having a thickness of 15.4 mm have been successfully joined with a joint efficiency of greater than 75%without supplementary strategies. The disparity in the effects of tool rotational speed and welding speed in the formation ofa sound weld has been addressed in detail to enhance the understanding of FSW of thick sections. Micro-hardness measurementshave been carried out throughout the transverse cross-section of the welds and correlated with different zones andtheir corresponding microstructures. Scanning electron microscopy and X-ray energy dispersive spectroscopy have beenused to characterize the coarse phase particles present in the weld zones.

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