NDLI: Metal Vapour Behaviour in Gas Tungsten Arc Thermal Plasma during Welding

Content Provider	Springer Nature Link
Author	Ushio, M. Murphy, A. B. Yamamoto, E. Yamazaki, K. Suzuki, K. Yamamoto, K. Nakata, K. Tanaka, M. Tashiro, S. Lowke, J. J.
Copyright Year	2008
Abstract	The present modelling of a gas tungsten arc in helium or argon accounts for metal vapour contamination from the weld pool as an anode. The whole region of gas tungsten arc welding, namely, tungsten cathode, arc plasma and weld pool is treated in a unified numerical model. A viscosity approximation is used to express the diffusion coefficient in terms of the viscosities of shielding gas and iron vapour. The time dependent two-dimensional distributions of temperature, velocity and iron vapour concentration are predicted, together with the weld penetration as function of time for a 150 A arc at atmospheric pressure. It is shown that the thermal plasma in a gas tungsten arc is markedly influenced by iron vapour from the weld pool surface and the concentration of iron vapour in the plasma is dependent on the temperature of the weld pool surface.
Starting Page	82
Ending Page	88
Page Count	7
File Format	PDF
ISSN	00432288
Journal	Welding in the World
Volume Number	52
Issue Number	11-12
e-ISSN	18786669
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-02-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Theoretical and Applied Mechanics Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Mechanical Engineering

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