Temperature measurements for high-current free-burning arcs in nitrogen

Haidar, J; Farmer, A. J. D.

doi:10.1088/0022-3727/26/8/011

Cited by 47 publications

(51 citation statements)

References 10 publications

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“…In LTE plasmas at constant pressure, this maximum (norm) intensity is reached for only one temperature value-the norm temperature, and should be identical for all plasma layers. Similar results were reported by Pellerin et al (1992) for arcs operated in argon and by Haidar and Farmer (1993) and Megy et al (1995) for arcs operated in nitrogen. Furthermore, Pellerin et al (1992) and Zhou and Heberlein (1998) found discrepancies between the temperatures determined in the cathode region using separately Ar I and Ar II lines.…”

Section: Introductionsupporting

confidence: 88%

Detection of the clock transition (1.14 μm) in ultra-cold thulium atoms

et al. 2015

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Degenerate four-wave mixing (DFWM) laser spectroscopy was used in local studies of atmospheric pressure argon plasma generated in a free-burning arc. The results of plasma diagnostics using the DFWM method were compared to the results obtained with optical emission measurements. In the cathode region of the arc the maxima of both the DFWM signal and the emission coefficient for the 696.5 nm Ar I line depend on the distance from the cathode tip. This effect proves the departure of the plasma state from local thermal equilibrium (LTE) as it has been reported by many authors. On the other hand the Stark shifts of the 696.5 nm Ar I line determined by the DFWM method in relation to plasma diagnostic results show no deviations from LTE on the arc axis down to 1.0 mm from the cathode tip.

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Section: Introductionsupporting

confidence: 88%

Detection of the clock transition (1.14 μm) in ultra-cold thulium atoms

et al. 2015

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“…The radial temperature distribution at ab was set according to Ref. 13 (with the peak in the center) as explained later. As regards the carrier gas, boundary conditions on the gas velocity in the axial and radial directions were set at the inlet and outlet.…”

Section: Modeling Of Arc Plasmamentioning

confidence: 99%

Selection of injection conditions for aluminum particles as a raw material by numerical analysis in the synthesis of ultrafine particles with transferred type arc plasma

Furukawa

Iwata

Adachi

et al. 2009

Electrical Engineering Japan

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“…The arc temperature is higher [16, 17 and 23] and concentrated in a narrower range [17] . This means that energy input per volume unit is higher and, in turn, permits higher welding speeds, the same as with helium and hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Automatic TIG welding of austenitic stainless steels in nitrogen and nitrogen-based gas mixtures

Zorc

2011

REVMETAL

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The paper treats studies of TIG gas-shielded arc welding using pure nitrogen, N 2 + 5-20 % Ar gas mixtures and N 2 + 2-10 % H 2 gas mixtures. A weld root shielding was provided by nitrogen gas. Welding in N 2 requires by 40 % lower welding current than welding in argon. The study showed that porosity was an issue due to overalloying of N 2 in the weld pool; it can, however, be avoided with adequate welding parameters, particularly sufficiently high welding speed and controlled low heat input. The microstructure of all-weld metal is fully austenitic (γ). Hydrogen reduces nitrogen solubility in the weld pool and produces an austenitic-ferritic (γ+δ) microstructure. Titanium increases nitrogen solubility in the weld pool and strongly reacts with nitrogen. Consequently, there is a high fraction of TiN inclusions in the weld metal. KeywordsTIG welding; Austenitic stainless steels; Nitrogen; Hydrogen. Soldadura TIG automática de acero inoxidable austenita en una atmósfera de protección de nitrógeno y mezclas de gas a base de nitrógeno ResumenHemos efectuado las investigaciones de la soldadura TIG en nitrógeno puro, las mezclas de gas N 2 + 5 hasta un 20 % Ar, así como también N 2 + 2 hasta un 10 % H 2 . Para la protección se utilizó nitrógeno. Para la soldadura se necesitan aproximadamente un 40 % menos de corriente de soldadura, comparado con la soldadura de argón. La investigación ha mostrado que la porosidad es un problema de absorción excesiva de la fundición con nitrógeno y que es posible suprimir la porosidad mediante parámetros adecuados de soldadura, sobre todo con una suficiente velocidad de soldadura y, con ella, una pequeña emisión controlada de calor. El hidrógeno reduce la solubilidad del nitrógeno en la fundición y acciona la segregación de ferrita. El titanio aumenta la solubilidad del nitrógeno en la fundición y reacciona fuertemente con el nitrógeno, de tal modo que en la soldadura hay una gran parte de inclusiones TiN. Palabras claveSoldadura TIG; Acero inoxidable austenita; Nitrógeno; Hidrógeno.

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Temperature measurements for high-current free-burning arcs in nitrogen

Cited by 47 publications

References 10 publications

Detection of the clock transition (1.14 μm) in ultra-cold thulium atoms

Detection of the clock transition (1.14 μm) in ultra-cold thulium atoms

Selection of injection conditions for aluminum particles as a raw material by numerical analysis in the synthesis of ultrafine particles with transferred type arc plasma

Automatic TIG welding of austenitic stainless steels in nitrogen and nitrogen-based gas mixtures

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