Volume 42, Issue 3 (May 2014)

    Influence of Shoulder Diameter, Plunge Depth, Welding Speed, Rotational Speed on the Tensile Behavior of Friction Stir Welded AA 6061-T6 Sheets

    (Received 18 July 2012; accepted 24 September 2013)

    Published Online: 2014

    CODEN: JTEOAD

      Format Pages Price  
    PDF Version 14 $25   ADD TO CART


    Abstract

    In the present work, the effect of a few important process parameters like shoulder diameter, plunge depth, welding speed, rotational speed on the tensile behavior, namely flow strength, elongation, and hardness are studied. The relation between the thickness gradient of friction stir welded (FSW) sheets developed during the forming and strain hardening exponent of weld zone and elongation improvement has been explored. Micro-hardness showed a decreasing trend, from the base material to the centre of the nugget zone, except near the transition zone. With increase in shoulder diameter and welding speed, hardness has increased. However, with increase in plunge depth and rotational speed, hardness has decreased. The plunge depth effect on hardness distribution is negligible. The FSW sheets showed a decreased flow stress and improved elongation when compared to base material. The overall elongation of FSW sheets and weld zone has improved with increase in plunge depth, shoulder diameter, and rotational speed in most of the cases, while welding speed has shown insignificant effect. The thickness gradient is found to be severe in un-welded blanks as compared to FSW blanks. With increase in shoulder diameter, plunge depth, and rotation speed, the thickness gradient is found to decrease, while welding speed showed negligible effect. With improvement in strain hardening exponent of FSW sheets and weld zone with respect to changing welding conditions, the thinning gradient has reduced improving the overall elongation of welded sheets in most of the cases.


    Author Information:

    Janaki Ramulu, Perumalla
    Department of Mechanical Engineering, Vardhaman College of Engineering, Kacharam, Shamshabad, Hyderabad,

    Ganesh Narayanan, R.
    Department of Mechanical Engineering, IIT Guwahati, Guwahati,


    Stock #: JTE20120236

    ISSN: 0090-3973

    DOI: 10.1520/JTE20120236

    ASTM International is a member of CrossRef.

    Author
    Title Influence of Shoulder Diameter, Plunge Depth, Welding Speed, Rotational Speed on the Tensile Behavior of Friction Stir Welded AA 6061-T6 Sheets
    Symposium , 0000-00-00
    Committee E28