The Paton Welding Journal, 2011, #5, 8-12 pages
ON THE SUBJECT OF ELECTRIC SUBMERGED-ARC WELDING
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
Results of investigation of the nature of flux melting in electric submerged-arc welding with slag bubble formation are described. It is established that the flux melts without formation of a slag bubble by the gas-plasma flows of the arc in the convective heat exchange mode. These conclusions are confirmed by visual observations of electric arc running under flux, using a procedure specially developed for this purpose. Moreover, an extended plume of liquid slag forms in the post-arc zone, which is separated from the weld metal by a wedge-like layer of solid slag. The process of slag crust formation is also due to high heat-insulating properties of welding fluxes.
electric submerged-arc welding, slag bubble, thermophysics, flux heat conductivity, hydrodynamics, visual observation of arcing, process diagram
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