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Research Papers

Vertical-Up Gas Tungsten Arc Welding of Ti6Al4V Alloy and Characterization

[+] Author and Article Information
R. K. Gupta

Materials and Mechanical Entity,
Vikram Sarabhai Space Centre,
Trivandrum 695022, India
e-mail: rohitkumar_gupta@vssc.gov.in

Paul G. Panicker, Vinu Paul, G. Radhakrishnan, L. Rajesh, V. Rajesh, P. Ramkumar, Shibu Gopinath

Materials and Mechanical Entity,
Vikram Sarabhai Space Centre,
Trivandrum 695022, India

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 26, 2015; final manuscript received December 30, 2015; published online February 3, 2016. Assoc. Editor: Vikas Tomar.

J. Eng. Mater. Technol 138(2), 021007 (Feb 03, 2016) (5 pages) Paper No: MATS-15-1146; doi: 10.1115/1.4032485 History: Received June 26, 2015; Revised December 30, 2015

Gas tungsten arc (GTA) welding of Ti alloy Ti6Al4V is carried out in vertical-up direction. Weld parameters for the Ti6Al4V alloy were developed using Ti6Al4V (ELI) alloy filler wire and following two pass welding process. X-ray radiography was carried out to ensure the soundness of the weld. Tensile strength of the weldment was evaluated and microstructure characterization was carried out. It is observed that specimens mostly failed in heat affected zone (HAZ) area toward parent material with occasional failure at the weld. Microhardness mapping and microstructural analysis revealed HAZ as the weaker zone, where dissolution of α and formation of β have initiated. Due to moderate cooling rate at this zone, microstructure remained α–β, whereas weld microstructure is found to have martensitic α′ resulting in an increase in the microhardness. Yield strength (YS) of weldment is found to be more than 90% of parent metal (PM) and also reduction in elongation is noted. Fractography observations of failed specimen away from the weld show mainly ductile failure. Weldment failure fractography shows the presence of dendrite indicating failure near the fusion line.

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Figures

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Fig. 1

Schematic diagram of PM (a) forged block, (b) coupon from block, (c) PM testing in X–X direction, and (d) PM testing in the Z–Z direction (all dimensions are in mm)

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Fig. 2

Schematic diagram of GTA weld configuration (a) weld coupon and test specimen in X–X direction and (b) weld coupon and test specimen in Z–Z direction (all dimensions are in mm)

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Fig. 3

Representative optical photomicrographs of GTAW (a1)–(c1) XX, (a2)–(c2) ZZ, (a1) and (a2) PM, (b1) and (b2) near weld (HAZ), and (c1) and (c2) weldment

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Fig. 4

Photomicrograph showing the presence of micropores in the XX3 weld failure (low % El sample)

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Fig. 5

Microhardness variation in GTA welded coupon

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Fig. 6

Representative fractured surface of GTAW tested specimens (a1) and (a2) XX-1, (b1) and (b2) XX-3, and (c1) and (c2) ZZ-1

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