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Effect of cathode m...
Effect of cathode model on arc attachment for short high-intensity arc on a refractory cathode
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- Javidi Shirvan, Alireza (author)
- Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW,Chalmers tekniska högskola,Chalmers University of Technology
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- Choquet, Isabelle, 1965- (author)
- Högskolan Väst,Avd för tillverkningsprocesser,PTW,University West
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- Nilsson, Håkan, 1971 (author)
- Chalmers University of Technology,Chalmers tekniska högskola
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(creator_code:org_t)
- 2016-11-03
- 2016
- English.
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In: Journal of Physics D. - : IOP Publishing. - 0022-3727 .- 1361-6463. ; 49:3 November 2016, s. 1-17
- Related links:
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Various models coupling the refractory cathode, the cathode sheath and the arc at atmospheric pressure exist. They assume a homogeneous cathode with a uniform physical state, and differ by the cathode layer and the plasma arc model. However even the most advanced of these models still fail in predicting the extent of the arc attachment when applied to short high-intensity arcs such as gas tungsten arcs. Cathodes operating in these conditions present a non-uniform physical state. A model taking into account the first level of this non-homogeneity is proposed based on physical criteria. Calculations are done for 5 mm argon arcs with a thoriated tungsten cathode. The results obtained show that radiative heating and cooling of the cathode surface are of the same order. They also show that cathode inhomogeneity has a significant effect on the arc attachment, the arc temperature and pressure. When changing the arc current (100 A, 200 A) the proposed model allows predicting trends observed experimentally that cannot be captured by the homogeneous cathode model unless restricting a priori the size of the arc attachment. The cathode physics is thus an important element to include to obtain a comprehensive and predictive arc model
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- activated tungsten cathode
- arc attachment
- electron emission
- gas tungsten arc
- modelling
- thermal plasma
- Production Technology
- Produktionsteknik
- Manufacturing and materials engineering
- Produktions- och materialteknik
Publication and Content Type
- vet (subject category)
- art (subject category)
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