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Utilization of Process Monitoring in Ti Alloy Welding

[+] Author Affiliations
Z. Sun, D. Pan

Singapore Institute of Manufacturing Technology, Singapore

Paper No. IMECE2007-41376, pp. 643-647; 5 pages
doi:10.1115/IMECE2007-41376
From:
  • ASME 2007 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design and Manufacturing
  • Seattle, Washington, USA, November 11–15, 2007
  • Conference Sponsors: ASME
  • ISBN: 0-7918-4297-5 | eISBN: 0-7918-3812-9
  • Copyright © 2007 by ASME

abstract

Titanium alloys have found increased applications in various industrial sectors. One of the critical issues in quality control is the weld penetration during welding. In the present paper, tungsten inert gas (TIG) welding was used to weld 8.0-mm thick Ti-6Al-4V alloy plates with and without an activating flux. The effect of the activating flux on Ti alloy welding was investigated. A data acquisition system was used to monitor the welding current and voltage signals during welding. These signals were then correlated to the weld penetration information. Results show that by applying the activating flux on the Ti-6Al-4V alloy surface, weld penetration depth increases, while the corresponding weld bead width is reduced. It was also found that various welding conditions, particularly flux thickness, influence the effectiveness of the activating flux. Results from monitoring of the welding current and voltage signals reveal that there is a clear correlation between the signals and the weld penetration. By analyzing the acquired signals, inconsistency in weld penetration can be identified. This demonstrates that process monitoring can provide an effective way to assess the consistency of the weld penetration and thus the quality of the welds.

Copyright © 2007 by ASME

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