By B I Medovar, V Ya Saenko, G M Grigorenko, Yu M Pomarin, V I Kumysh
The ebook describes the tactic of remelting consumable electrodes with an electrical are burning among the skin of a liquid slag tub and a consumable electrode in a water-cooled copper mildew. the tactic combines the chances of therapy of liquid steel with the electrical arc within the gasoline surroundings and the liquid slag and the benefits of plasma-arc and electro slag remelting. The technological probabilities, layout positive factors of melting structures and result of experimental and business melting trials of steels and alloys are defined. as well as remelting structural steels, certain realization is given to the opportunity of alloying the steel with nitrogen from the fuel part, with no utilizing pricey nitrogen-bearing nonmetallic compounds, e.g. silicon nitride. it's proven that arc slag remelting can be used successfully in generating ingots of titanium and its alloys. the implications received during this process are in comparison with electro slag remelting and plasma arc remelting. info on strength intake and steel caliber also are awarded.
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Extra info for ARC-Slag Remelting of Steel and Alloys
The E O Paton Electric Welding Institute have developed and applied widely electroslag remelting (ESR), in which the metal is melted as a result of the heat generated during passage of current through a slag pool. This was followed by the development of electron beam (EBR) and plasma arc (PAR) remelting processes, in which the electron beam and low-temperature plasma respectively are used as heat sources. Figures 1-5 show the diagrams of VAR, ESR, EBR and PAR processes in the main variants and, for comparison, the diagram of consumable plasma torch remelting (CPTR) - a variety of plasma arc remelting which combines several features of PAR and VAR.
8, forming a ring-shaped slag bath. Remelting can be carried out using consumable solid-section electrodes as well as hollow electrodes. The use of hollow electrode makes it possible to exert a more efficient effect by gases on the metal, by supplying the gas through the cavity directly into the arcing zone. Remelting with the metal bath incompletely covered with the slag (ring-shaped slag bath) can be carried out using hollow electrodes or solid-section electrodes. In ASR with a continuous bath, Fig.
Recorded at the electrode tip in the arcing zone (Sa). These processes take place at a lower rate in peripheral regions (So, Ss), where the liquid film is not in contact with the arc. In this case, the metal bath is in contact only with the slag (Fo) and gas-exchange reactions take place between the metal and the slag, as in electroslag remelting. 18b, the depth of the slag bath decreases so that the arc pressure exposes part of the surface of the metal bath directly below the electrode, Fa. This greatly intensifies the processes of gas absorption directly by the surface of the liquid bath.