Open Access Open Access  Restricted Access Subscription Access
Open Access Open Access Open Access  Restricted Access Restricted Access Subscription Access

Experimental Investigation of TIG Welding Ti-6Al-4V by using different supply mixture ratio of Ar-He Shielding Gas


Affiliations
1 GTRE, Defence Research and Development Organisation, Bangalore - 560 093, India
2 Production Engineering Department, NITT, Tiruchirappalli - 620 015, India
     

   Subscribe/Renew Journal


Ti-6Al-4V is a material that is extensively used in the gas turbine application. The fabrication of the assemblies of the gas turbine made up of Ti-6Al-4V involves Tungsten Inert Gas (TIG) welding. It is preferred to have a minimal bead width for minimal distortion with full penetration welds meeting the required weld quality as per aerospace weld standards. The primary purging gas which is usually employed during TIG welding is inert argon gas. In this present study argon and helium gas mixture was adopted as shielding gas. Taguchi design of experiment has been employed involving L9 orthogonal array with 3 parameters and 3 levels. The aim of the study was to understand the effect of the weld parameters and Ar-He gas mix ratio on the bead width of the welds. The obtained results were analyzed using ANOVA and found the welding current having significant effect on bead width followed by welding speed and Ar-He gas mix. A linear regression mathematical model is generated of the response variable. In order to ascertain the optimized parameters confirmation tests are conducted and obtained results are correlated. Macroscopic images do not show any crack or porosity and thereby confirm that defect free welds can be produced within the range of process parameters.

Keywords

TIG welding; Ti-6Al-4V; Ar-He gas mix; Weld bead; Taguchi; orthogonal array.
User
Subscription Login to verify subscription
Notifications
Font Size

  • Veiga C, Davim JP and Loureiro AJR (2012); Properties and Applications of Titanium Alloys: A Brief Properties and Applications of Titanium Alloys, Advanced Material Science, 32, pp. 133-148.
  • Yung WKC, Ralph B, Lee WB and Fenn R (1997); An investigation into welding parameters affecting the tensile properties of titanium welds, Journal of Materials Processing Technology, 63(1-3), pp. 759-764.
  • Caiazzo F, Alfieri V, Astarita A, Squillace A and Barbieri G (2017); Investigation on laser welding of Ti-6Al-4V plates in corner joint, Advances in Mechanical Engineering, 9(1), pp. 1-9.
  • Mishra D (2017); Response Surface Optimization of Interpulse TIG welding for the Optimum Weld bead of Ti-6Al-4V, International Journal for research in Applied Science & Engineering Technology, 5(IX).
  • Devendranath R K, Varma V, Prasad M, Rajan ND and Shanmugam NS (2018); Effect of activated flux on penetration depth, microstructure and mechanical properties of Ti-6Al-4V TIG welds, Journal of Materials Processing Tech, 261, pp. 233-241.

Abstract Views: 62

PDF Views: 1




  • Experimental Investigation of TIG Welding Ti-6Al-4V by using different supply mixture ratio of Ar-He Shielding Gas

Abstract Views: 62  |  PDF Views: 1

Authors

A. Manjunath
GTRE, Defence Research and Development Organisation, Bangalore - 560 093, India
E. V. Abhinav
Production Engineering Department, NITT, Tiruchirappalli - 620 015, India
K. Parthiba
GTRE, Defence Research and Development Organisation, Bangalore - 560 093, India

Abstract


Ti-6Al-4V is a material that is extensively used in the gas turbine application. The fabrication of the assemblies of the gas turbine made up of Ti-6Al-4V involves Tungsten Inert Gas (TIG) welding. It is preferred to have a minimal bead width for minimal distortion with full penetration welds meeting the required weld quality as per aerospace weld standards. The primary purging gas which is usually employed during TIG welding is inert argon gas. In this present study argon and helium gas mixture was adopted as shielding gas. Taguchi design of experiment has been employed involving L9 orthogonal array with 3 parameters and 3 levels. The aim of the study was to understand the effect of the weld parameters and Ar-He gas mix ratio on the bead width of the welds. The obtained results were analyzed using ANOVA and found the welding current having significant effect on bead width followed by welding speed and Ar-He gas mix. A linear regression mathematical model is generated of the response variable. In order to ascertain the optimized parameters confirmation tests are conducted and obtained results are correlated. Macroscopic images do not show any crack or porosity and thereby confirm that defect free welds can be produced within the range of process parameters.

Keywords


TIG welding; Ti-6Al-4V; Ar-He gas mix; Weld bead; Taguchi; orthogonal array.

References





DOI: https://doi.org/10.22486/iwj.v55i1.211207