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Effect of Flux Gap and Particle Size on the Depth of Penetration in FBTIG Welding of Aluminium

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Abstract

Flux Bounded TIG welding is a variation of Activated TIG welding wherein a narrow strip of base metal is coated with activating flux and is exposed to the arc during welding. Bead on plate welds by FBTIG process on commercially pure aluminium plates were performed using silica as flux. This paper investigated the effect of flux gap and flux powder particle size on the weld penetration and depth to width ratio. Microstructural analysis was carried out to understand the changes in grain structure in the weld pool and adjacent zones. It was observed that the weld penetration and depth to width ratio increased with the decreasing flux gap. Also, results showed better penetration for activating flux with finer flux powder size. The mechanisms that supported these observations have been explained.

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Acknowledgments

The authors acknowledge Shri. Santhana Babu, Scientist, SHAR, ISRO for providing the necessary materials for the experiment and Shri. Thomas Varghese for providing assistance for carrying out the experiments.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Thiruvananthapuram, 695547, India

    S. Jayakrishnan, P. Chakravarthy & A. Muhammed Rijas

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  1. S. Jayakrishnan
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  2. P. Chakravarthy
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  3. A. Muhammed Rijas
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Correspondence to S. Jayakrishnan.

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Jayakrishnan, S., Chakravarthy, P. & Muhammed Rijas, A. Effect of Flux Gap and Particle Size on the Depth of Penetration in FBTIG Welding of Aluminium. Trans Indian Inst Met 70, 1329–1335 (2017). https://doi.org/10.1007/s12666-016-0929-1

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