Gas tungsten arc welding using an arcing wire

J. S. Chen, Y. Lu, X. R. Li, Y. M. Zhang

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Gas tungsten arc welding (GTAW) is a widely used process. It often requires adding filler metals to produce desired welds. Unfortunately, both conventional cold wire and hot-wire GTAW require heat be transferred from the weld pool to the wire in order to finally finish the melting of the wire. The achievable deposition rate of the filler metal is coupled with the arc energy and mass of the molten metal in the weld pool. When the total mass of the weld pool is restricted as at the overhead position during pipe welding, the achievable deposition rate of each pass is directly reduced by this coupling. In this research, the authors proposed to completely melt the wire at high speeds without heat transferred from the weld pool. In particular, a side arc is added into the gas tungsten arc (GTA) between the wire and the same tungsten that establishes the GTA with the workpiece. While its anode provides a gas metal arc welding (GMAW) melting mechanism to completely melt the wire at high speeds, the undesirable dependence of deposition rate on the weld pool mass is also eliminated. As a result, the deposition rate is increased and the ability to provide a desirable deposition rate and base metal melting/penetration freely without coupling is established for GTAW. Through the establishment of an experimental setup and the performance of a series of carefully designed experiments, this proposed arcing-wire GTAW process and its anticipated merits as aforementioned were experimentally demonstrated.

Original languageEnglish
Pages (from-to)261s-269s
JournalWelding Journal
Volume91
Issue number10
StatePublished - Oct 2012

Keywords

  • Cold Wire GTAW
  • Deposition Rate
  • Filler Wire
  • GTAW
  • Gas Tungsten Arc Welding
  • Hot Wire GTAW
  • Productivity

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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