Issue 48

H. S. Patil et alii, Frattura ed Integrità Strutturale, 48 (2019) 377-384; DOI: 10.3221/IGF-ESIS.48.36 377 Characterizations of TIG welded joints of unalloyed commercially pure Titanium Gr-2 for weld process parameters H. S. Patil, D. C. Patel Mechanical Department, GIDC Degree Engineering College, Abrama, Gujarat, India hspatil28@gmail.com, pateldcp@gmail.com C. S. Patil Mechanical Department, S. S. Agrawal Institute of Engineering & Technology, Navsari, Gujarat, India chetan27051985@gmail.com A BSTRACT . Titanium and titanium alloys can be welded by gas tungsten arc, gas metal arc, plasma arc and electron beam welding processes. Titanium material is a reactive metal and is sensitive to embrittlement by oxygen, nitrogen, and hydrogen gas at elevated temperatures. Consequently, the metal must be protected from atmospheric contamination. This can be provided by shielding the metal with welding grade inert gas. The present work describes the application of TIG arc welding to titanium and investigated the effect of welding parameters like weld current, weld gap and gas flow rate on mechanical properties of welded joints of unalloyed commercially pure titanium Gr-2 materials. Taguchi optimization method has been used to find out optimal setting of parameters for weld joints characterization. The welded joints showed maximum ultimate tensile strength of about 429MPa with percentage elongation of 23.33%. A significant grain coarsening has noticed in the fusion zone consisting of α-phase in different direction bounded by β- phase. The hardness value at fusion zone and base metal are typically observed to be 235HV and 145HV respectively. K EYWORDS . TIG welding; Titanium Gr-2; Weld parameters; Weld characterization. Citation: Patil, H. S., Patel, D. C., Patil, C. S., Characterizations of TIG welded joints of unalloyed commercially pure titanium Gr-2 for weld process parameters, Frattura ed Integrità Strutturale, 48 (2019) 377-384. Received: 18.12.2018 Accepted: 23.02.2019 Published: 01.04.2019 Copyright: © 2019 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION he high strength, low weight ratio and outstanding corrosion resistance inherent to titanium and its alloys has led to a wide and diversified range of successful applications which demand high levels of reliable performance in surgery and medicine as well as in aerospace, automotive, chemical plant, power generation, oil and gas extraction, sports, and other major industries. T