Experimental investigations and numerical prediction on the effect of shielding area and post flow time in the GTAW of CP Ti sheets

  • A. KarpagarajEmail author
  • N. Siva Shanmugam
  • K. Sankaranarayanasamy


In this study, bead on plate (BoP) trials are conducted on 2-mm thick commercially pure titanium (CP Ti) sheets by gas tungsten arc welding (GTAW) process. Welding current (75–105 A) and joining speed (250–300 mm/min) are taken as the variables. In the weld samples’ appearance of the surface, colorizations are noticed for understanding the role of shielding gas. BoP trials are subjected to metallographic examination to measure weld profiles. These measured values are fed as input for the Goldak double ellipsoidal model to performing the GTAW process. For BoP trials, temperature profile and Iso-surface contours along the moving heat source direction are taken at various time intervals. From the temperature history, shielding area and post flow time are identified. A shielding arrangement is fabricated and implemented based on these bead profile and temperature profile history. After the successful fabrication of shielding arrangement, experimental butt joints are made by GTAW process to verify the efficiency of shielding arrangement. Bead profile of experimentally fabricated 1.6-mm and 2-mm butt joints are compared and verified against the finite element model results. Moreover, cupping test is conducted to analyze the ductility of the joints. The maximum elongation of 96.10% is measured for 1.6-mm face out joints from cupping test.


GTAW process Weld profile Welding simulation Shielding arrangements Erichsen cupping test 


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© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  • A. Karpagaraj
    • 1
    Email author
  • N. Siva Shanmugam
    • 2
  • K. Sankaranarayanasamy
    • 3
  1. 1.Department of Mechanical EngineeringNational Institute of TechnologyPatnaIndia
  2. 2.Department of Mechanical EngineeringNational Institute of TechnologyTiruchirappalliIndia
  3. 3.Department of Mechanical EngineeringNational Institute of TechnologyPuducherryIndia

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