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Effect of Tool Shoulder Diameter to Plate Thickness Ratio on Mechanical Properties and Nugget Zone Characteristics During FSW of Dissimilar Mg Alloys

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Abstract

During friction stir welding (FSW), frictional heat is produced in the region between the tool shoulder and base materials due to the movement of the rotating tool along the line of joint. In this paper, an experimental investigation was made to understand the influence of the tool shoulder diameter (primary source of heat generation) on the microstructural characteristics and mechanical properties of dissimilar Mg alloys namely AZ80A and AZ91C. From the experimental results, it was observed that the use of FSW tool having 17.5 mm shoulder diameter (3.5 times the plate thickness) produced defect free sound joints with superior mechanical properties compared to its counterparts. Moreover, the uniformly distributed fine sized grains of nugget zone also contributed to the sound quality joints. From this investigation, it was understood that higher heat input is essential for enabling the required mixing of materials during FSW of dissimilar Mg alloys.

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Acknowledgments

The authors gratefully thank the Management and Mechanical Engg Dept., S.A Engineering College, Chennai, India for providing the welding equipment facilities. The authors wish to express thanks to All India Council for Technical Education (AICTE) Govt. of INDIA, funded project (Grant No. 8023/RID/RPS/037/2011-12) for sponsoring FSW machine.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Magna College of Engineering, Magaral, Chennai, 600 055, India

    P. Sevvel

  2. Department of Mechanical Engineering, S.A. Engineering College, Thiruverkadu, Chennai, 600 077, India

    V. Jaiganesh

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  1. P. Sevvel
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  2. V. Jaiganesh
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Correspondence to P. Sevvel.

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Sevvel, P., Jaiganesh, V. Effect of Tool Shoulder Diameter to Plate Thickness Ratio on Mechanical Properties and Nugget Zone Characteristics During FSW of Dissimilar Mg Alloys. Trans Indian Inst Met 68 (Suppl 1), 41–46 (2015). https://doi.org/10.1007/s12666-015-0602-0

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  • DOI: https://doi.org/10.1007/s12666-015-0602-0

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