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Technical Briefs

Effect of Pulsed Current Gas Tungsten Arc Welding Parameters on Microstructure of Titanium Alloy Welds

[+] Author and Article Information
M. Balasubramanian1

Department of Mechanical Engineering, Velammal Engineering College, Surapet, Chennai-66, Tamilnadu, Indiamanianmb@rediffmail.com

V. Jayabalan

Department of Manufacturing Engineering, Anna University, Guindy, Chennai 600 025, Indiajbalan@annauniv.edu

V. Balasubramanian

Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar 608 002, Indiavisvabalu@yahoo.com

1

Corresponding author.

J. Manuf. Sci. Eng 131(6), 064502 (Nov 05, 2009) (4 pages) doi:10.1115/1.4000373 History: Received January 17, 2007; Revised August 15, 2009; Published November 05, 2009; Online November 05, 2009

Titanium is one of the most important nonferrous metals, which finds extensive application in aerospace and chemical industries, because of its light weight, excellent corrosion resistance and high strength to weight ratio. Single pass gas tungsten arc (GTA) welding of thin sections of Ti–6Al–4V was accomplished with pulsing current technique and was found to be superior to conventional continuous current process in terms of grain refinement in the fusion zone. In this investigation, an attempt was made to study the effect of pulsed current GTA welding parameters on titanium alloy weld characteristics such as grain size and hardness. It was revealed that at an optimum value of 6 Hz pulse frequency and 80A peak current, the hardness was maximum and the grain size was minimum. Pulsing current in inert gas welding was found to be beneficial in titanium welding.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Optical micrographs of fusion zone

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Figure 2

Effect of pulse current parameters on fusion zone hardness

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Figure 3

Effect of pulse current parameters on fusion zone grain size

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Figure 4

Effect of (peak current x pulse frequency) on fusion zone hardness

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Figure 5

Effect of (peak current x pulse frequency) fusion zone grain size

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