A kind of vacuum arc furnace auxiliary electrode external welding device and welding method

Abstract

The invention provides an outside-furnace welding device and method for auxiliary electrodes of a vacuum arc furnace. The outside-furnace welding device and method are used for welding between the auxiliary electrodes of the vacuum arc furnace and consumable electrodes. A consumable electrode positioning device comprises a first center frame regulation device, a second center frame regulation device and a third center frame regulation device, wherein the first center frame regulation device, the second center frame regulation device and the third center frame regulation device are arranged in a manner of spacing a certain interval and are of the same structure. An auxiliary electrode positioning device comprises a fixed shear type regulation device, a movable shear type regulation device, a guide rail, a sighting device positioning mechanism and a scale mechanism. An electrode lifting and rotating drive device comprises a first lifting type rotation device, a second lifting type rotation device and a third lifting type rotation device. The second lifting type rotation device actively rotates (is provided with a drive mechanism), and the first lifting type rotation device and the third lifting type rotation device passively rotate (are not provided with drive mechanisms except a drive roller). By means of the outside-furnace welding device and method, the cylindrical auxiliary electrodes of different specifications and cylindrical consumable electrodes of different specifications can be welded outside the vacuum arc furnace according to a certain coaxiality requirement so that the original manner for conducting welding inside the vacuum arc furnace can be replaced.

Description

technical field [0001] The present invention relates to the technical field of special metallurgy, in particular, the present invention relates to a vacuum electric arc furnace auxiliary electrode welding device outside the furnace and a welding method thereof. The vacuum electric arc furnace auxiliary electrode welding device outside the furnace and its welding method are used for welding between the vacuum electric arc furnace auxiliary electrode and the consumable electrode, and can realize cylindrical auxiliary electrodes of different specifications (diameter, length) and different specifications (diameter, length) cylindrical consumable electrodes are welded outside the vacuum electric arc furnace according to a certain coaxiality requirement (using semi-automatic melting electrode argon arc welding and carried out by the welder's hand-held welding torch) to replace the original vacuum electric arc furnace In the way of welding. Background technique [0002] Vacuum (co...

AI Technical Summary

Problems solved by technology

[0011] 1) The alignment accuracy is poor, and there are hidden dangers in product quality

[0012] First of all, the centering of the consumable electrode on the base of the crystallizer outside the furnace, the base of the mold as the centering reference usually has serious deformation due to high-temperature smelting, and due to the corrosion of molten steel during smelting, the removal of the mold The collision and polishing during assembly make the boundary line on the base of the crystallizer as the measurement reference blurred, thus seriously affecting the centering accuracy

[0013] 2) Secondly, the centering of the consumable electrode in the mold of the smelting station. Similarly, the mold used as the centering reference is usually deformed due to high-temperature smelting, and the shape of the mold port used as the measurement reference is usually arc chamfered , the boundary line is blurred, which also seriously affects the alignment accuracy

[0014] In summary, due to the difficulty in controlling the centering accuracy of the consumable electrode, it will be difficult to ensure the coaxiality between the auxiliary electrode and the consumable electrode, which will affect the stability of the smelting process and bring hidden dangers to product quality; ensure A certain welding quality is more difficult

[0015] Because the welding of the auxiliary electrode is carried out in a closed furnace, the operator cannot clearly observe the welding process, and abnormal situations (such as the liquid metal flowing too long, etc.) will inevitably occur. In order to determine whether the welding quality meets the requirements, the vacuum must be broken. Open the furnace to check the welding quality and deal with abnormal situations. Therefore, it is difficult to ensure a certain welding quality

[0016] 3) High energy consumption

After the auxiliary electrode is welded in the furnace, in order to take out the self-consumable electrode to locate the wooden wedge, check the welding quality and deal with abnormal conditions, the furnace must be broken and opened. , this process consumes a lot of energy

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