**Author details**

*Aluminium Alloys and Composites*

**10. Conclusions**

is being viewed clearly across the FSP zone.

AA6061 aluminum alloy.

**11. Limitations of the present work**

solidification.

**Acknowledgements**

in **Figure 13**. The SEM analysis has been conducted at three different levels of magnification to analyse the weld defects. It is observed that no micro or microscopic voids and cracks observed in the FSP region. The thermal flow of material

• The attempt made in the present work for joining of age hardenable aluminum alloy AA6061 (medium strength) by FSW using Vertimach V-350 Vertical Machining Centre and the attempt was effective and proved to be consistent with the expected values with their mechanical properties of the joints.

• The tool with triangulated pin profiles produced mechanically sound and nonmetallurgically deficient joints for both AA6061 aluminum alloys, regardless of

welding parameters, among the three tool pin profiles for this study.

• The macrostructure, tensile strengths, hardness, microstructure and SEM analysis have been evaluated in detail for the effect of rotational speed, welding speed and axial force on the formation of a defeat free FSP zone. The welding conditions for producing defect-free joints have been established for

• An ANN modelling is developed to obtain the theoretical results and compared with the experimental results among all three different pin profiles, the triangular pin profile found to be closer value to the experimental strength of

• The SEM images clearly show the metal flow across the joints for three different pin profiles. It is also evident from SEM analysis that the triangular pin profile exhibits better stirring action than compared to a threaded pin profile.

• The FSW joints are susceptible to defects such as pinhole, defects in the tunnel, piping failures, kissing attachment, cracks and so on due to poor metal flow and lack of metal build-up in the FSP area, although they are free from cracks of

The author is grateful to M/s. Bindu Tools India Pvt. Ltd. for supplying necessary tools and also to the department of mechanical engineering, S.V. University College of Engineering, Tirupati, for providing necessary facilities to carry out the work.

the weld joint at 30 neurons and validated at 95% confidence level.

**148**

Pothur Hema Department of Mechanical Engineering, SVU College of Engineering, Tirupati, Andhra Pradesh, India

\*Address all correspondence to: hemasvumech@gmail.com

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
