PSI - Issue 14

K. Vijayan et al. / Procedia Structural Integrity 14 (2019) 642–648 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

648

7

5. Conclusion

A study was carried out on FSW plate using different pin configurations. For each pin configuration the carriage speed and the rotation speed of the tool which produced maximum tensile strength was found to be different. Depending on the tool rotation and carriage speed the temperature distribution across the weld varied. The micro structural properties were revealed using microscopic images. The variation in grain size across the base metal, TMAZ, HAZ and weld zone was evident. For the specimen with low tensile strength the presence of micro void was visible. After understanding the micro structuraldetails, the influence on the damping was understood on the built-up system. The built-up system showed that the presence of a local welded element on the welded plate significantly influence the global dynamics. For the badly welded specimen the damping was found to be significantly higher than good sample. This can influence the local failure of the welded member. Hence a proper deign of local member with proper weld is important for structural integrity. Acknowledgements The first author gratefully acknowledge the support and funding received for the presented work from SERB under Project no. ECR/2016/001531. References Colegrove, P. & Shercliff, H. (2004), ‘Two -dimensional CFD modelling of flow round profiled FSW tooling’, Science and technology of welding and joining 9(6), 483 – 492. Kumar, D. A., Biswas, P., Tikader, S., Mahapatra, M. & Mandal, N. (2013), ‘A study on friction stir welding of 12mm thick aluminum alloy plates’, Journal of Marine Science and Application 12(4), 493 – 499. Mishra, R. S. & Ma, Z. (2005), ‘Friction stir welding and processing’, Materials Science and Engineering: R: Reports 50(1 -2), 1 – 78. Nandan, R., DebRoy, T. & Bhadeshia, H. (2008), ‘Recent advances in friction -stir welding –process, weldment structure and properties’, Progress in Materials Science 53(6), 980 – 1023. Reynolds, A. P. (2008), ‘Flow visualization and simulation in fsw’, Scripta materialia 58(5), 338 – 342. Thomas, W., Nicholas, E., Needham, J. C., Murch, M., Templesmith, P. & Dawes, C. (1991), ‘Friction stir welding’, International patent application no. PCT/GB92102203 and Great Britain patent application (9125978.8). Threadgill, P., Leonard, A., She rcliff, H. & Withers, P. (2009), ‘Friction stir welding of aluminium alloys’, International Materials Reviews 54(2), 49 – 93. Vijayan, K. & Woodhouse, J. (2013), ‘Shock transmission in a coupled beam system’, Journal of Sound and Vibration 332(16), 3681 – 3695. Vijayan, K. & Woodhouse, J. (2014), ‘Shock amplification, curve veering and the role of damping’, Journal of Sound and Vibrat ion 333(5), 1379 – 1389.