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Influence of M-TIG and A-TIG Welding Process on Microstructure and Mechanical Behavior of 409 Ferritic Stainless Steel

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Abstract

The current study investigates the effects of activating flux tungsten inert gas welding (A-TIG) and multipass tungsten inert gas welding (M-TIG) on the weld morphology, angular distortion, microstructures and mechanical properties when welding 8-mm-thick 409 ferritic stainless steel (FSS). SiO2 was used as activating flux for A-TIG welding, while SUPERTIG ER309L was used as filler for M-TIG welding. Bead-on-plate weld trials were carried out to obtain the full penetration by using different combinations of flux coating density, welding speed and welding current. An optical microscope, field emission scanning microscope (FESEM), and x-ray diffractometer were used for the metallurgical characterizations. Vickers hardness, tensile test, Charpy toughness test, and creep behavior test were carried out to evaluate the mechanical properties of the base and weld metals. Experimental results indicate that the A-TIG process can increase the joint penetration and tends to reduce the angular distortion of the 409 FSS weldment. The A-TIG welded joint also exhibited greater mechanical strength. However, a critically low Charpy toughness was measured for the A-TIG weld fusion zone, which was later sufficiently improved after post weld heat treatment (PWHT). It was concluded that PWHT is mandatory for A-TIG welded 409 FSS.

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Acknowledgments

The authors gratefully acknowledge the financial support provided to this study by the Board of Research in Nuclear Sciences (BRNS) under the Grant No. 36(2)/14/70/2014-BRNS/10416, India.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttrakhand, 247667, India

    R. S. Vidyarthy & D. K. Dwivedi

  2. AWPM Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India

    M. Vasudevan

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  1. R. S. Vidyarthy
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  2. D. K. Dwivedi
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  3. M. Vasudevan
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Correspondence to R. S. Vidyarthy.

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Vidyarthy, R.S., Dwivedi, D.K. & Vasudevan, M. Influence of M-TIG and A-TIG Welding Process on Microstructure and Mechanical Behavior of 409 Ferritic Stainless Steel. J. of Materi Eng and Perform 26, 1391–1403 (2017). https://doi.org/10.1007/s11665-017-2538-5

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  • DOI: https://doi.org/10.1007/s11665-017-2538-5

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