Arc pressure and weld metal fluid flow whilst using alternating shielding gases Part 2 : arc force determination
Campbell, Stuart and Galloway, Alexander and McPherson, Norman (2013) Arc pressure and weld metal fluid flow whilst using alternating shielding gases Part 2 : arc force determination. Science and Technology of Welding and Joining, 18 (7). pp. 597-602. ISSN 1362-1718 (https://doi.org/10.1179/1362171813Y.0000000141)
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Abstract
The transient variation of the shielding gas present in the alternating shielding gas process produces a dynamic action within the liquid weld metal. Flow vectors opposite in direction have been reported due to the various forces acting on the weld metal when argon and helium are present, however no data has been provided to substantiate this claim. This part of the study evaluates the various forces acting on the liquid weld metal when using argon and helium and their effects discussed. It was determined that argon produces a greater vertically downward force in the central region than helium for both the arc force and Lorentz force. While helium produces a greater radially outwards force at the pool surface than argon due to plasma shear stress and Marangoni convection. In addition, the buoyancy force, i.e. the vertically upward force in the central portion of the weld metal, was greater for helium.
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Item type: Article ID code: 43494 Dates: DateEventOctober 2013Published24 May 2013Published OnlineSubjects: Technology > Mechanical engineering and machinery Department: Faculty of Engineering > Mechanical and Aerospace Engineering Depositing user: Pure Administrator Date deposited: 15 Apr 2013 13:25 Last modified: 23 Jul 2024 00:58 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/43494