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Method for welding auxiliary electrode in VAR smelting furnace

An auxiliary electrode and melting furnace technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of long investment cycle and shorten VAR melting preparation time, and achieve the effect of improving production efficiency and reducing preparation waiting time.

Inactive Publication Date: 2020-03-31
PANGANG GRP PANZHIHUA TITANIUM MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long investment cycle of titanium and titanium alloy smelting equipment, the demand for increasing production capacity is increasing at this stage, so how to shorten the preparation time for VAR smelting has become a concern of manufacturers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Welding an auxiliary electrode with a diameter of Φ400mm in a VAR melting furnace, the process is as follows:

[0021] 1) Install the auxiliary electrode in the furnace, seal the furnace and vacuum; control the cold vacuum degree in the VAR melting furnace below 0.9Pa, and control the cold gas leakage rate of the VAR melting furnace below 4Pa·L / s;

[0022] 2) Power transmission and arcing, so that the auxiliary electrode and the main electrode to be connected to each other are heated and melted and quickly butted together, and the maximum temperature of the welding connection is controlled above 1300 ℃;

[0023] 3) Pour argon gas into the VAR smelting furnace. When the pressure in the furnace reaches 4800~4900Pa, stop the gas flow;

[0024] 4) After cooling for 35 minutes, turn on the VAR melting furnace to inspect the weld.

[0025] Compared with the existing welding process, the above-mentioned welding process increases the cooling rate to 29°C / min, reduces the preparation wait...

Embodiment 2

[0027] Welding an auxiliary electrode with a diameter of Φ600mm in a VAR melting furnace, the process is as follows:

[0028] 1) Install the auxiliary electrode in the furnace, seal the furnace and vacuum; control the cold vacuum degree in the VAR melting furnace below 0.9Pa, and control the cold gas leakage rate of the VAR melting furnace below 4Pa·L / s;

[0029] 2) Power transmission and arcing, so that the auxiliary electrode and the main electrode to be connected to each other are heated and melted and quickly butted together, and the maximum temperature of the welding connection is controlled above 1500℃;

[0030] 3) Pour argon gas into the VAR smelting furnace, and stop the gas flow when the pressure in the furnace is detected to reach 5500-5600Pa;

[0031] 4) After cooling for 55 minutes, turn on the VAR melting furnace to inspect the weld.

[0032] Compared with the existing welding process, the above-mentioned welding process increases the cooling rate to 27°C / min, reduces the p...

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Abstract

The invention belongs to the field of metallurgical smelting equipment, and particularly discloses a method for welding an auxiliary electrode in a VAR smelting furnace. The method can be used for rapidly cooling the welded auxiliary electrode. The method for welding the auxiliary electrode in the VAR smelting furnace comprises the steps that the cold state vacuum degree in the VAR smelting furnace is controlled to be 1.0Pa or below before the auxiliary electrode is welded, and the cold state air leakage rate of the VAR smelting furnace is controlled to be 5Pa.L / s or below; then argon is introduced for cooling after the auxiliary electrode is welded; and finally, the pressure in the VAR smelting furnace is controlled to be 4500-6000 Pa, and cooling is conducted for 30-60 min. The welded auxiliary electrode can be rapidly cooled, the cooling speed is increased to 25 DEG C / min or above from 15 DEG C / min, the waiting time for VAR smelting preparation can be shortened by 30min or above, the power consumption can be reduced by at least 100 degrees per furnace, and the production efficiency is improved by 5% or above.

Description

Technical field [0001] The invention belongs to the field of metallurgical melting equipment, and specifically relates to a method for welding auxiliary electrodes in a VAR melting furnace. Background technique [0002] VAR melting furnace is the abbreviation of vacuum consumable arc melting furnace, which is widely used in the melting of titanium and titanium alloys. As the price of sponge titanium drops, the cost-effectiveness of the product increases, and the initial investment decreases, the market demand for titanium and titanium alloys is gradually increasing. Due to the long investment cycle of smelting equipment for titanium and titanium alloys, there is an increasing demand for increased production capacity at this stage. Therefore, how to shorten the preparation time for VAR smelting has become a concern for manufacturers. The preparation for VAR smelting includes welding the auxiliary electrode in the VAR smelting furnace. The auxiliary electrode is also called the du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235
CPCB23K9/0026B23K9/16B23K9/235
Inventor 王怀柳李露翟信杰陈鑫
Owner PANGANG GRP PANZHIHUA TITANIUM MATERIAL CO LTD
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