NDLI: Effect of plasma heat source characteristics on nitrogen absorption in gas tungsten arc weld metal

Content Provider	Springer Nature Link
Author	Sugiura, K. Murphy, A. B. Nakanishi, S. Kodama, S. Tanaka, M. Tsujimur, Y.
Copyright Year	2013
Abstract	Effects of plasma heat source characteristics on nitrogen absorption in gas tungsten arc (GTA) weld metal was investigated using two-dimensional spectroscopic measurements and numerical analyses. In the condition of 1 % nitrogen-mixed shielding gas, nitrogen content of weld metal in a helium arc or an argon-hydrogen arc decreased compared to that of an argon arc. These changes in nitrogen content had a strong correlation with arc voltages for the respective shielding gases, so it was considered that nitrogen absorption in weld metal was affected by arc plasma heat source characteristics. The spectroscopic measurements of these arcs showed that the plasma temperature near the molten pool surface in the helium arc or the argon-hydrogen arc indicated around 6,500 K, while the plasma temperature in the argon arc achieved more than 10,000 K. Additionally, from numerical analyses of GTA dealing with metal vapor, it was found that the plasma temperature in the helium arc was reduced by the metal vapor generated from the molten pool. As a result, the reduction of nitrogen disassociation caused by decreasing plasma temperature was considered as the significant factor in lowering nitrogen absorption in the helium arc.
Starting Page	925
Ending Page	932
Page Count	8
File Format	PDF
ISSN	00432288
Journal	Welding in the World
Volume Number	57
Issue Number	6
e-ISSN	18786669
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-07-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Spectroscopy Simulating Absorption Shielding gases Metallic Materials GTA welding Arc welding Nitrogen 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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