By B I Medovar, V Ya Saenko, G M Grigorenko, Yu M Pomarin, V I Kumysh
The publication describes the strategy of remelting consumable electrodes with an electrical are burning among the outside of a liquid slag bathtub and a consumable electrode in a water-cooled copper mold. the strategy combines the chances of remedy of liquid steel with the electrical arc within the fuel surroundings and the liquid slag and some great benefits of plasma-arc and electro slag remelting. The technological probabilities, layout positive factors of melting platforms and result of experimental and business melting trials of steels and alloys are defined. as well as remelting structural steels, specific cognizance is given to the potential of alloying the steel with nitrogen from the gasoline section, with out utilizing dear 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 got during this technique are in comparison with electro slag remelting and plasma arc remelting. facts on power intake and steel caliber also are offered.
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Extra resources for ARC-Slag Remelting of Steel and Alloys
This is one of the main advantages of ASR in comparison with VAR. 8 Arc slag remelting a hollow-section electrode. 1) ingot; 2) metal bath; 3) slag bath; 4) electric arc; 5) consumable electrode; 6) liquid metal film; 7) droplets; 8) water-cooled stool. The depth of the metal bath in melting ingots by the ASR method is smaller than in ESR and the bath is flatter. This is explained by the fact that due the generation of a large part of heat in the arc column in the ASR method, the bath surface is heated more uniformly.
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. In addition, the use of a hollow electrode makes it possible to improve greatly the gas exchange in the reaction zone and slightly increase the active surface (Sa) of the remelted electrode. A mathematical model of gas absorption in ASR. The interaction of gases in arc-slag remelting can be classified as a typical heterogeneous reaction taking place at the gas-slag-metal boundary.
When the weight of the liquid metal becomes equal to the surface tension force, the droplet stretches and a neck forms. In this case, the surface tension force has a compressing effect on the resultant droplet neck thus supporting droplet separation. e. 12. 1) slag; 2) electrode. 1) slag; 2) electrode. through the droplet. Therefore, in addition to the gravitational and surface tension forces, the liquid droplet metal is also strongly affected by the electrodynamic force (pinch effect) which compresses the droplet neck and leads to droplet separation.
ARC-Slag Remelting of Steel and Alloys by B I Medovar, V Ya Saenko, G M Grigorenko, Yu M Pomarin, V I Kumysh