Measurement and simulation of plasma and shielding gas flows in welding arcs

• Autorzy: Dorner K. , Fussel U. , Schnick M. , Zschetzsche J. , Guth U. , Zosel J.
• Języki publikacji: EN

Abstrakty

EN

Gas flows in welding processes were investigated by Particle Image Velocimetry (PIV) as a non intrusive optical method, which enables flow investigations with relatively high spatial and temporal resolution by photographing a two-dimensional flow field twice within a short time interval. The main problem of overexposure of the pictures by the arc radiation can be circumvented by reducing the exposure time below 100 ns and filtering the light at all wavelengths differing from the wavelength of the flashing laser beam more than 3 nm. Magnesium oxide powder with particle size of d < 1 um was used as tracer. The measuring system can be used for optimising the flows of arc- and plasma processes. In combination with a trigger actuation signal the PIV system is able to visualise transient processes like MAG welding or pulsed arc welding. The experimental results are compared with that of numerical analysis based on a newly developed model.

Słowa kluczowe

EN

plasma; welding arc; arc process; numerical analysis

PL

plazma; łuk spawalniczy; spawanie; przepływ; analiza numeryczna; metoda łukowa

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Systems : journal of transdisciplinary systems science
• Rocznik: 2006
• Tom: Vol. 11, nr 1
• Strony: 16--21
• Opis fizyczny: bibliogr. 10 poz.

Twórcy

autor

Dorner K.

autor

Fussel U.

autor

Schnick M.

autor

Zschetzsche J.

autor

Guth U.

autor

Zosel J.

• Danetc Dynamics, Neu-Ulm, Germany.

Bibliografia

• [1] Schellhase, M.: Der SchweiGlichtbogen ein technologisches Werkzeug, VEB Verlag Technik Berlin, 1985.
• [2J Killing, R.: Handbuch der Schweifiverfahren (Teil 1), DVS Verlag, 1991.
• [3] Niemeyer, M.: Beschreibung der physikalischen Vorgange beim atmospharischen Plasmaschneiden, Fortschritt Berichte VDI Nr. 494, VDI Verlag 1998.
• [4] Rieder, W.: Plasma und Lichtbogen, Verlag Vieweg und Sohn, 1967.
• [5] Bohme, D.: Gezielte Beeinflussung des Lichtbogenprozesses in der Fertigung. In: DVS 127, S. 78-91.
• [6] Spille-Kohoff, A.: Implementation of Magnetohydrodynamics into CFX-5. Berlin: CFX Software GmbH, 2002.
• [7] Murphy, A.B., Arundell, C.J.: Transport coefficients of Argon, Nitrogen, Oxygen, Argon-Nitrogen and Argon- Oxygen Plasmas, Plasma Chemistry and Plasma Processing, Vol. 14 No. 4 1994.
• [8] Murphy, A.B.: Transport coefficients of Air, Argon-Air, Nitrogen-Air Oxygen-Air Plasmas, Plasma Chemistry and Plasma Processing, Vol. 15 No. 2 1995.'
• [9] Murphy, A.B.: Transport coefficients of Helium and Argon-Helium Plasmas, Transaction of Plasma Science, Vol. 25 No. 5 1997.
• [10] Murphy, A.B.: Transport coefficients of Hydrogen and Argon- Hydrogen Plasma Chemistry and Plasma Processing, Vol. 20, No. 3, 2000.