Arc pressure and weld metal fluid flow whilst using alternating shielding gases Part 1: arc pressure measurement

Stuart Campbell, Alexander Galloway, Norman McPherson

Research output: Contribution to journalArticle

10 Citations (Scopus)
153 Downloads (Pure)

Abstract

As part of an ongoing process to fully evaluate the effects of an alternating shielding gas supply on gas shielded welding processes, a comparison between the arc pressures generated using argon, helium, alternating shielding gases and pulsed GTAW has been conducted. Arc pressure variation and peaking are two of the fundamental phenomena produced during the alternating shielding gas process and are said to help create a stirring action within the liquid weld metal. However, there is no published data on arc pressure measurements during an alternating shielding gas supply and, consequently, these phenomena are based solely on theoretical assumptions. The experimental measurements made have shown that alternating shielding gases produces considerably higher arc pressures than argon, helium and pulsed GTAW due to a surge at weld initiation. The transient arc pressure measurements made when using alternating shielding gases are also considerably different from the theoretical assumptions previously reported.
Original languageEnglish
Pages (from-to)591-596
JournalScience and Technology of Welding and Joining
Volume18
Issue number7
Early online date24 May 2013
DOIs
Publication statusPublished - Oct 2013

Keywords

  • GTAW
  • alternating shielding gases
  • GTAW-P
  • arc pressure measurement
  • Pressure impulse
  • current density

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