Comprehensive Analysis of TIG Welded Inconel–718 Alloy for Different Heat Input Conditions

 
 
 
  • Abstract
  • Keywords
  • References
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  • Abstract


    In this research, the effects of heat input on tensile properties and microstructure were investigated for super alloy Inconel-718 sheets weld by Tungsten Inert Gas (TIG) welding process. The tensile properties and microstructure of weld joints were evaluated. The experiment was conducted with six different combinations of welding parameters like welding current, voltage and welding speed, which were give in six different welding heat input combinations of welding parameters. The experimental results shows that the welding joints weld with low welding heat input was yield higher tensile properties. From the experimentation it was understand that the tensile properties increases when the welding heat input decrease. Drastic grain coarsening was evidenced when the heat input was increases. For the weld joints experimented in this research it was also observed that amount of laves phase was increased with increase in the welding heat input which is the major fact for noticeable variation in the ultimate tensile strength of the weld joints welded by TIG welding process with different welding heat input.

     


  • Keywords


    Tungsten inert gas welding, tensile properties, welding parameters, laves phase

  • References


      [1] Agilan M, Venkateswara T, Sivakumar T & Pant B, “Effect of Heat Input on Microstructure and Mechanical Properties of Inconel –718 ED Welds”, Procedia Material Science, Vol.5, (2014), pp.656-662.

      [2] Hong JK, Park JH, Eom IS, Kim MB & Kang CY, “Microstructure and Mechanical Properties of Inconel 718 Welds by CO2 laser Welding”, Journal of Material Processing Technology, Vol.201, (2008), pp.515-520.

      [3] Lin HL & Wu TM, “Effects of activating flux on weld bead geometry of Inconel 718 alloy TIG welds”, Materials and Manufacturing Processes, Vol.27, No.12,(2012), pp.1457-1461.

      [4] Lingenfelter A, “Welding of Inconel 718 – A Historical Review, in: E. A. Loria (Ed.)”, Conference Proceedings on Superalloy 718 – Metallurgy and Applications, (1989).

      [5] Thompson RG, “Micro-Fissuring of Inconel 718 in the Weld HAZ”, Journal of Materials, Vol. 40, No.7, (1988).

      [6] Cam G & Kocak M, “Progress in Joining of Advanced Materials”, International Material Review, Vol.43, (1988).

      [7] Janaki Ram GD, Prasad Rao K, Reddy GM & Sarin Sundar JK, “Microstructure and Tensile Properties of Inconel 718 Pulsed Nd- YAG Laser Welds”, Journal of Materials Processing Technology, Vol.167, (2005), pp.73-82.

      [8] Gordin J, “Some problems in welding Inconel 718”, Welding Journal, Vol.11, (1971).

      [9] James LA, “Fatigue Crack Growth in Inconel 718 Weldments at Elevated Temperatures”, Welding Journal, Vol.1, (1978).

      [10] Mills WJ, “Effect of Heat Treatment on the Tensile and Fracture Toughness Behaviour of Inconel 718 Weldments”, Welding Journal, Vol.8, (1984).

      [11] Schirra JJ, Caless RH & Hatala RW, “The Effect of Laves Phase on the Mechanical Properties of Wrought and Cast + HIP Inconel 718, E.A. Loria (Ed.)”, Conference Proceedings on Super alloys 718,625 and Various Derivatives, Vol. 375, (1991).

      [12] Radhakrishna CH & Prasad Rao K, “Studies on Creep Stress Rupture Behaviour of Superalloy 718 Weldments Used in Gas Turbine Applications”, Materials at High Temperature, Vol.12, No.4, (1994).

      [13] Radhakrishna CH & Prasad Rao K, “The Formation and Control of Laves Phase in Superalloy 718 Welds”, Journal of Material Science, Vol.32, (1997).

      [14] Manikandan SGK, Sivakumar D, Prasad Rao K & Kamaraj M, “Microstructural Characterization of Liquid Nitrogen Cooled Alloy 718 Fusion Zone”, Journal of Materials Processing Technology, Vol.214, (2014), pp.3141-3149.

      [15] Lu S, Fujii H & Nogi K, “Arc ignitability, bead protection and weld shape variations for He–Ar–O2 shielded GTA welding on SUS304 stainless steel”, Journal of materials processing technology, Vol. 209, (2009), pp.1231-1239.

      [16] Manikandan SGK, Sivaumar D, Kamaraj M & Prasad Rao K, “Laves Phase Control in Inconel 718 Weldments”, Material Science Forum, Vol.710, (2012), pp.614-619.

      [17] Yang D, Li X, He D, Nie Z & Huang H, “Microstructural and mechanical property characterization of Er modified Al–Mg–Mn alloy Tungsten Inert Gas welds”, Materials & Design, Vol.34, (2012), pp.655-659.

      [18] Durgutlu A, “Experimental Investigation of the Effect of Hydrogen in Argon as a Shielding Gas on TIG Welding of Austenitic Stainless Steel”, Journal of Materials and Design, Vol.25, (2004), pp.19-23.

      [19] Nowacki J & Rybicki P, “The influence of welding heat input on submerged arc welded duplex steel joints imperfections”, Journal of Materials Processing Technology, Vol.164, (2005), pp.1082-1088.


 

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Article ID: 14971
 
DOI: 10.14419/ijet.v7i3.6.14971




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