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Effect of Tool Shoulder Diameter on Stir Zone Characteristics of Friction Stir Welded HSLA Steel Joints

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Abstract

In this study, the effect of tool shoulder diameter (primary heat generating source) to the plate thickness ratio on tensile and impact toughness properties of friction stir welded high strength low alloy (HSLA) steel was investigated. A naval grade HSLA steel of 5 mm thick plates were welded with tool rotational speed of 600 rpm and welding speed of 30 mm/min using five tungsten based alloy tools having shoulder diameter varying from 20 to 30 mm. Microstructural characteristics of the weld joints were analyzed using optical microscopy along with the evaluation of tensile properties. From this investigation, it was found that the joint fabricated using a tool shoulder diameter of 25 mm (5 times the plate thickness) exhibited superior mechanical properties compared to other joints.

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Acknowledgments

The authors are grateful to The Director, Naval Material Research Laboratory (NMRL), Ambernath for financial support through CARS project No: G8/15250/2011 dated 29.02.2012 and providing base material for this investigation. Also the authors are grateful to Dr. A. K. Lakshminarayanan, Associate Professor, SSN College of Engineering, Chennai, India for his valuable suggestions, guidance and discussion to carry out this investigation.

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Authors and Affiliations

  1. Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, 608 002, India

    S. Ragu Nathan

  2. Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, 608 002, India

    V. Balasubramanian & S. Malarvizhi

  3. Marine Materials Division, Naval Materials Research Laboratory (NMRL), Ambernath, Mumbai, Maharastra, 421 506, India

    A. G. Rao

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  1. S. Ragu Nathan
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  2. V. Balasubramanian
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  3. S. Malarvizhi
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  4. A. G. Rao
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Correspondence to S. Ragu Nathan.

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Ragu Nathan, S., Balasubramanian, V., Malarvizhi, S. et al. Effect of Tool Shoulder Diameter on Stir Zone Characteristics of Friction Stir Welded HSLA Steel Joints. Trans Indian Inst Met 69, 1861–1869 (2016). https://doi.org/10.1007/s12666-016-0846-3

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  • DOI: https://doi.org/10.1007/s12666-016-0846-3

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