Welding aluminum alloy 6061 with the opposing dual-torch GTAW process

Y. M. Zhang, S. B. Zhang

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


Cracking is a major concern in welding aluminum alloys. Although weld solidification cracks can be eliminated through the addition of filler metal, the additives modify the alloy or base metal constituents and may not always be desirable. High-energy beam processes, such as electron beam welding, that result in minimal heat input reduce crack sensitivity, but their high cost limits their applications. In this study, the conventional gas tungsten arc welding process is modified by disconnecting the workpiece from the power supply and placing a second torch on the opposite side of the workpiece. Such a modification changes the direction of the current flow, improves the weld penetration and reduces the heat input. Using this modified process, 6061-T651 alloy was welded without filler metals. Analysis suggested the reduced heat input, the changed direction of the current flow and the symmetric heating were responsible for the observed reduction of the cracking sensitivity.

Original languageEnglish
Pages (from-to)202-S-206-S
JournalWelding Journal (Miami, Fla)
Issue number6
StatePublished - 1999


  • Gas Tungsten Arc GTAW Aluminum Solidification Cracking Dual Torch HAZ Heat Input 6061-T651

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys


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