Influence of Plasma Gas Flow Rate on the Mechanical and Microstructural Aspects of Plasma Arc Welded Titanium Alloy Joints

Authors

  • Pragatheswaran T Research Scholar,Annamalai University, Annamalai Nagar, Tamil Nadu- 608002, India
  • Rajakumar S Annamalai University, Annamalai Nagar, Tamil Nadu- 608002, India
  • Balasubramanian V Annamalai University, Annamalai Nagar, Tamil Nadu- 608002, India

Keywords:

Plasma Arc welding, Ti6Al4V alloy, Microstructure, Welding Defects, Tensile Strength

Abstract

In the present investigation, the effect and role of plasma gas flow rate on the formation of microstructure during plasma arc welding of Ti6Al4V titanium alloy were studied using microscopic observation, energy dispersive spectroscopic analysis, tensile tests and microhardness measurements. Plasma gas flow rate influences the arc pressure, arc constriction, and stability. The transformation of plasma arc from conduction mode to keyhole mode causes severe changes to the microstructural characteristics of the titanium welds. This transformation takes place with slight variations of PGFR. Weld geometries increase with an increase in the PGFR. The microstructural examination shows that there are various phases formed during the variation in PGFR. Fusion zone had acicular α and widmanstätten α. Mechanical properties (i.e) strength and hardness of the joints increase with an increase in plasma gas flow rate. In the joint welded with 1 L/min, there is the formation of α-case which is an oxygen rich brittle subsurface structure and found detrimental to the ductility of the joints.

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References

A.B. Short, Gas Tungsten Arc Welding of α + β Titanium Alloys: A Review, Mater. Sci. Technol., Taylor & Francis, 2009, 25(3), p 309–324.

A. V Lukoyanov, Formation of Pores in the Weld Metal in Automatic Argon-Shielded Arc Welding of Titanium Alloys, Weld. Int., Taylor & Francis, 2014, 28(4), p 301–303.

M. Peters, J. Hemptenmacher, J. Kumpfert, and C. Leyens, Structure and Properties of Titanium and Titanium Alloys, Titanium and Titanium Alloys, John Wiley & Sons, Ltd, 2003, p 1–36.

C. Leyens, “Oxidation and Protection of Titanium Alloys and Titanium Aluminides,” Titanium and Titanium Alloys, 2003, p 187–230.

H. Sibum, “Titanium and Titanium Alloys – From Raw Material to Semi-Finished Products,” Titanium and Titanium Alloys, 2003, p 231–244.

M. Peters, J. Kumpfert, C.H. Ward, and C. Leyens, Titanium Alloys for Aerospace Applications, Adv. Eng. Mater., 2003, 5(6), p 419–427.

D.I. Pantelis, M. Kazasidis, and P.N. Karakizis, Titanium Alloys Thin Sheet Welding with the Use of Concentrated Solar Energy, J. Mater. Eng. Perform., 2017, 26(12), p 5760–5768.

I. Balasundar, T. Raghu, and B.P. Kashyap, Correlation between Microstructural Features and Tensile Properties in Near-α Titanium Alloy IMI 834 Processed in the α + β Regime, Mater. Perform. Charact., G.E. Totten, Ed., (West Conshohocken, PA), ASTM International, 2019, 8(5), p 932–945.

M. Peters, J. Kumpfert, C.H. Ward, and C. Leyens, Titanium Alloys for Aerospace Applications, Adv. Eng. Mater., 2003, 5(6), p 419–427.

M.A. Vasechkin, O.Y. Davydov, A.B. Kolomenskii, and S. V Egorov, Effect of Welding and Heat Treatment Regimes on the Mechanical Properties of Various Titanium Alloy Welded Joints, Chem. Pet. Eng., 2018, 54(7), p 525–530.

M. Baruah and S. Bag, Microstructural Influence on Mechanical Properties in Plasma Microwelding of Ti6Al4V Alloy, J. Mater. Eng. Perform., 2016, 25(11), p 4718–4728.

M. Vyskoč, M. Sahul, and M. Sahul, Effect of Shielding Gas on the Properties of AW 5083 Aluminum Alloy Laser Weld Joints, J. Mater. Eng. Perform., 2018, 27(6), p 2993–3006.

P. Kumar and A.N. Sinha, Effect of Heat Input in Pulsed Nd:YAG Laser Welding of Titanium Alloy (Ti6Al4V) on Microstructure and Mechanical Properties, Weld. World, 2019, 63(3), p 673–689.

J. CHEN and C. PAN, Welding of Ti-6Al-4V Alloy Using Dynamically Controlled Plasma Arc Welding Process, Trans. Nonferrous Met. Soc. China, 2011, 21(7), p 1506–1512.

W. Sun, M. Mohammed, L. Xu, T. Hyde, D. Mccartney, and S. Leen, Process Modelling and Optimization of Keyhole Plasma Arc Welding of Thin Ti-6Al-4V, J. Strain Anal. Eng. Des., 2014, 49, p 410–420.

A. Deshpande, A. Short, W. Sun, D. Mccartney, L. Xu, and T. Hyde, Finite Element-Based Analysis of Experimentally Identified Parametric Envelopes for Stable Keyhole Plasma Arc Welding of a Titanium Alloy, J. Strain Anal. Eng. Des., 2012, 47, p 266–275.

S. Sundaresan and G.D.J. Ram, Use of Magnetic Arc Oscillation for Grain Refinement of Gas Tungsten Arc Welds in α–β Titanium Alloys, Sci. Technol. Weld. Join., Taylor & Francis, 1999, 4(3), p 151–160.

T.R. Muth, Y. Yamamoto, D.A. Frederick, C.I. Contescu, W. Chen, Y.C. Lim, W.H. Peter, and Z. Feng, Causal Factors of Weld Porosity in Gas Tungsten Arc Welding of Powder-Metallurgy-Produced Titanium Alloys, JOM, 2013, 65(5), p 643–651.

V.I. Murav’ev, R.F. Krupskii, R.A. Fizulakov, and P.G. Demyshev, Effect of the Quality of Filler Wire on the Formation of Pores in Welding of Titanium Alloys, Weld. Int., Taylor & Francis, 2008, 22(12), p 853–858.

T.S. Balasubramanian, M. Balakrishnan, V. Balasubramanian, and M.A. Muthu Manickam, Effect of Welding Processes on Joint Characteristics of Ti-6Al-4v Alloy, Sci. Technol. Weld. Join., 2011, 16(8), p 702–708.

V.P. Leonov, V.I. Mikhailov, I.Y. Sakharov, and S. V Kuznetsov, Welding of High-Strength Titanium Alloys of Large Thicknesses for Use in Marine Environments, Inorg. Mater. Appl. Res., 2016, 7(6), p 877–883.

W.D. Brewer, R.K. Bird, and T.A. Wallace, Titanium Alloys and Processing for High Speed Aircraft, Mater. Sci. Eng. A, 1998, 243(1), p 299–304.

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Published

2022-09-01

How to Cite

[1]
. P. T, R. S, and B. V, “Influence of Plasma Gas Flow Rate on the Mechanical and Microstructural Aspects of Plasma Arc Welded Titanium Alloy Joints”, JME, vol. 17, no. 3, pp. 080–086, Sep. 2022.