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Effect of Pulse Frequency on Tensile Properties and Microstructural Characteristics of Gas Tungsten Arc Welded AZ31B Magnesium Alloy

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Abstract

Magnesium alloys have recently received considerable attention due to their excellent properties such as light weight, high specific strength and stiffness, machinability and recyclability. These advantages make magnesium alloys very attractive materials in a wide variety of applications, where weight reduction is extremely important. However, magnesium alloys are currently still not as popular as aluminium alloys in structural applications and a major technical challenge is the development of reliable and inexpensive joining methods to produce high quality welds. Hence in this investigation an attempt has been made to study the effect of pulse frequency on tensile and microstructural characteristics of pulsed current gas tungsten arc welded AZ31B magnesium alloy joints. Five joints were fabricated using different levels of pulse frequencies (2–6 Hz). From this investigation, it is found out that the joints fabricated using a pulse frequency of 5 Hz yielded superior tensile properties compared to other joints. The formation of fine grains and uniformly distributed precipitates in the fusion zone are the main reasons for the superior tensile properties of these joints.

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Acknowledgments

The authors wish to place their sincere thanks to University Grant commission (UGC), New Delhi for financial support rendered through Major Research Project No: 39-864/2010.

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Authors and Affiliations

  1. Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, 608002, Tamil Nadu, India

    V. Subravel, G. Padmanaban & V. Balasubramanian

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  1. V. Subravel
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  2. G. Padmanaban
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  3. V. Balasubramanian
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Correspondence to V. Subravel.

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Subravel, V., Padmanaban, G. & Balasubramanian, V. Effect of Pulse Frequency on Tensile Properties and Microstructural Characteristics of Gas Tungsten Arc Welded AZ31B Magnesium Alloy. Trans Indian Inst Met 68, 353–362 (2015). https://doi.org/10.1007/s12666-014-0469-5

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  • DOI: https://doi.org/10.1007/s12666-014-0469-5

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