• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2015, Volume: 8, Issue: 31, Pages: 1-4

Original Article

Defect Analysis on Al 7020 FSW Joints with Mg Interlayering


The use of light weight materials for industrial application is a driving force for the development of joining techniques. Especially in maintenance of cryogenic tanks, space craft body etc. Friction Stir Welding (FSW) inspired joints of materials because it does not involve bulk melting of the basic components so this can be employed in such of light metal structures manufacturing or maintenance. Here, two Aluminium 7020 plates were welded with Mg as interlayer, using friction stir welding method. The joints were produced using same welding parameters only the variation is done in the traveling speed of the tool. Tensile strength of the joint is determined using a universal testing machine. Hardness of the joint is found out by Rockwell hardness test. To validate the results Scanning Electron Microscope (SEM) and Energy Dispersive X-ray spectroscopy (EDX) testing where done. By analyzing the test result we found that joints with 10mm/ min travel speed have comparatively high strength than other joints. Analysis found that even in the 10mm/min travel speed weld contain small defects and it is found that defect plays a vital role in the strength of the material.
Keywords: Defects, Energy Dispersive X-ray spectroscope (EDX), Friction Stir Welding of Al7020, Light Metal Joining, Mg interlayer, Scanning Electrode Microscope (SEM)


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