CN110935985A - Method for welding auxiliary electrode in VAR smelting furnace - Google Patents
Method for welding auxiliary electrode in VAR smelting furnace Download PDFInfo
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- CN110935985A CN110935985A CN201911260217.5A CN201911260217A CN110935985A CN 110935985 A CN110935985 A CN 110935985A CN 201911260217 A CN201911260217 A CN 201911260217A CN 110935985 A CN110935985 A CN 110935985A
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- auxiliary electrode
- smelting furnace
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- welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
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, which can quickly cool the welded auxiliary electrode. The method for welding the auxiliary electrode in the VAR smelting furnace comprises the steps of controlling the cold state vacuum degree in the VAR smelting furnace to be below 1.0Pa before welding the auxiliary electrode, controlling the cold state air leakage rate of the VAR smelting furnace to be below 5 Pa.L/s, introducing argon gas after welding the auxiliary electrode for cooling, controlling the pressure in the VAR smelting furnace to be 4500-6000 Pa, cooling for 30-60 min, rapidly completing cooling of the welded auxiliary electrode, increasing the cooling speed to be above 25 ℃/min from the original 15 ℃/min, reducing the waiting time of VAR smelting preparation for more than 30min, reducing the power consumption by at least 100 ℃ per furnace, and improving the production efficiency by more than 5%.
Description
Technical Field
The invention belongs to the field of metallurgical smelting equipment, and particularly relates to a method for welding an auxiliary electrode in a VAR smelting furnace.
Background
The VAR smelting furnace is a vacuum consumable arc smelting furnace for short, and is widely applied to smelting titanium and titanium alloy. With the reduction of the price of the titanium sponge, the cost performance of the product is improved, the initial investment is reduced, and the market demand for titanium and titanium alloy is gradually increased. Because the investment period of titanium and titanium alloy smelting equipment is long, the demand for improving the productivity is more and more increased at the present stage, and therefore, how to shorten the preparation time of VAR smelting becomes a concern of manufacturers. The preparation of VAR smelting comprises welding an auxiliary electrode in a VAR smelting furnace, wherein the auxiliary electrode is also called a false electrode, only plays a role of connecting a consumable electrode and a power supply loop in smelting and does not really participate in smelting; how to rapidly cool the auxiliary electrode in the process of welding the auxiliary electrode is the key for shortening the equipment thermal downtime and improving the work efficiency of VAR smelting preparation.
Disclosure of Invention
The invention aims to provide a method for welding an auxiliary electrode in a VAR smelting furnace, which can quickly cool the welded auxiliary electrode.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for welding the auxiliary electrode in the VAR smelting furnace comprises the following steps:
step one, charging the auxiliary electrode, sealing the furnace and vacuumizing; controlling the cold vacuum degree in the VAR smelting furnace to be below 1.0Pa, and controlling the cold air leakage rate of the VAR smelting furnace to be below 5 Pa.L/s;
step two, transmitting power for arcing, enabling the sections to be connected between the auxiliary electrode and the main electrode to be quickly butted together after being heated and melted, and controlling the highest temperature of the welding connection part to be more than 1300 ℃;
step three, introducing argon into the VAR smelting furnace, and stopping introducing the argon when the pressure in the furnace is detected to reach 4500-6000 Pa;
and step four, after cooling for 30-60 min, opening the VAR smelting furnace, and detecting the welding seam.
And further, in the third step, argon is introduced into the VAR smelting furnace through a sealing pipeline externally connected to the VAR smelting furnace.
Furthermore, the purity of the introduced argon is more than or equal to 99.9 percent.
The invention has the beneficial effects that: the method can rapidly finish cooling the welding auxiliary electrode by effectively controlling the cold vacuum degree and the cold gas leakage rate in the VAR smelting furnace before welding the auxiliary electrode, then introducing argon for cooling after welding the auxiliary electrode, and effectively controlling the pressure and the total cooling time in the VAR smelting furnace, so that the cooling speed is increased to more than 25 ℃/min from the original 15 ℃/min, the waiting time of VAR smelting preparation can be reduced by more than 30min, the power consumption can be reduced by at least 100 ℃ per furnace, and the production efficiency is increased by more than 5%.
Detailed Description
The present invention will be further described with reference to the following examples.
The method for welding the auxiliary electrode in the VAR smelting furnace comprises the following steps:
step one, charging the auxiliary electrode, sealing the furnace and vacuumizing; controlling the cold vacuum degree in the VAR smelting furnace to be below 1.0Pa, and controlling the cold air leakage rate of the VAR smelting furnace to be below 5 Pa.L/s;
step two, transmitting power for arcing, enabling the sections to be connected between the auxiliary electrode and the main electrode to be quickly butted together after being heated and melted, and controlling the highest temperature of the welding connection part to be more than 1300 ℃; the welding connection part is the part of the auxiliary electrode and the main electrode after the end faces to be connected are butted;
step three, introducing argon into the VAR smelting furnace, and stopping introducing the argon when the pressure in the furnace is detected to reach 4500-6000 Pa; in the step, argon is generally introduced into the VAR smelting furnace through a sealing pipeline which is externally connected to the VAR smelting furnace, a valve is generally arranged on the sealing pipeline, and the VAR smelting furnace is closed by closing the valve after the introduction of the argon is finished; the purity of the introduced argon is usually more than or equal to 99.9 percent; the pressure in the VAR smelting furnace is detected by a vacuum gauge;
and step four, after cooling for 30-60 min, opening the VAR smelting furnace, and detecting the welding seam.
According to the method for welding the auxiliary electrode in the VAR smelting furnace, after the auxiliary electrode is welded, the argon gas filling pipeline and the sealing valve are introduced into the VAR smelting furnace, the auxiliary electrode welded in the VAR smelting furnace can be effectively prevented from being oxidized, the pressure intensity and the cooling time of the argon gas filling are controlled, and the cooling time of the auxiliary electrode is finally shortened on the premise of ensuring the air tightness of the VAR smelting furnace.
Example 1
An auxiliary electrode with the diameter of phi 400mm is welded in a certain VAR smelting furnace, and the process is as follows:
1) charging the auxiliary electrode into a furnace, sealing the furnace and vacuumizing; controlling the cold vacuum degree in the VAR smelting furnace to be below 0.9Pa, and controlling the cold air leakage rate of the VAR smelting furnace to be below 4 Pa.L/s;
2) feeding power to start arc, so that the sections to be connected of the auxiliary electrode and the main electrode are quickly butted together after being heated and melted, and the highest temperature of the welding connection part is controlled to be more than 1300 ℃;
3) introducing argon into the VAR smelting furnace, and stopping introducing the argon when the pressure in the furnace is detected to reach 4800-4900 Pa;
4) and after cooling for 35min, opening the VAR smelting furnace and detecting the welding line.
Compared with the existing welding process, the welding process has the advantages that the cooling speed is increased to 29 ℃/min, the waiting time for preparation is reduced by 50min, the power consumption is reduced by 130 degrees/furnace, and the production efficiency is increased by 7%.
Example 2
An auxiliary electrode with the diameter of phi 600mm is welded in a certain VAR smelting furnace, and the process is as follows:
1) charging the auxiliary electrode into a furnace, sealing the furnace and vacuumizing; controlling the cold vacuum degree in the VAR smelting furnace to be below 0.9Pa, and controlling the cold air leakage rate of the VAR smelting furnace to be below 4 Pa.L/s;
2) feeding power to start arc, so that the sections to be connected of the auxiliary electrode and the main electrode are quickly butted together after being heated and melted, and the highest temperature of the welding connection part is controlled to be more than 1500 ℃;
3) introducing argon into the VAR smelting furnace, and stopping introducing the argon when the pressure in the furnace reaches 5500-5600 Pa;
4) and after cooling for 55min, opening the VAR smelting furnace and detecting the welding seam.
Compared with the existing welding process, the welding process has the advantages that the cooling speed is increased to 27 ℃/min, the waiting time for preparation is reduced by 45min, the power consumption is reduced by 105 degrees/furnace, and the production efficiency is increased by 6%.
Claims (3)
- A method for welding an auxiliary electrode in a VAR smelting furnace, comprising the steps of:step one, charging the auxiliary electrode, sealing the furnace and vacuumizing; controlling the cold vacuum degree in the VAR smelting furnace to be below 1.0Pa, and controlling the cold air leakage rate of the VAR smelting furnace to be below 5 Pa.L/s;step two, transmitting power for arcing, enabling the sections to be connected between the auxiliary electrode and the main electrode to be quickly butted together after being heated and melted, and controlling the highest temperature of the welding connection part to be more than 1300 ℃;step three, introducing argon into the VAR smelting furnace, and stopping introducing the argon when the pressure in the furnace is detected to reach 4500-6000 Pa;and step four, after cooling for 30-60 min, opening the VAR smelting furnace, and detecting the welding seam.
- 2. The method for welding an auxiliary electrode in a VAR melting furnace according to claim 1, wherein: and in the third step, introducing argon into the VAR smelting furnace through a sealing pipeline externally connected to the VAR smelting furnace.
- 3. The method for welding the auxiliary electrode in the VAR melting furnace according to claim 1 or 2, wherein: the purity of the introduced argon is more than or equal to 99.9 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911260217.5A CN110935985A (en) | 2019-12-10 | 2019-12-10 | Method for welding auxiliary electrode in VAR smelting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911260217.5A CN110935985A (en) | 2019-12-10 | 2019-12-10 | Method for welding auxiliary electrode in VAR smelting furnace |
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| Publication Number | Publication Date |
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| CN110935985A true CN110935985A (en) | 2020-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911260217.5A Pending CN110935985A (en) | 2019-12-10 | 2019-12-10 | Method for welding auxiliary electrode in VAR smelting furnace |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55106679A (en) * | 1979-02-13 | 1980-08-15 | Hitachi Ltd | Arc welding method |
| CN101214571A (en) * | 2007-12-27 | 2008-07-09 | 西北有色金属研究院 | A welding method for electrodes used in vacuum consumable arc melting |
| CN102586648A (en) * | 2012-03-09 | 2012-07-18 | 华北电力大学 | Zirconium alloy material for cathode of direct current arc air plasma torch and preparation method thereof |
| CN102806426A (en) * | 2012-08-06 | 2012-12-05 | 攀钢集团江油长城特殊钢有限公司 | Welding process of auxiliary electrode for vacuum arc remelting furnace |
| CN102912152A (en) * | 2012-09-19 | 2013-02-06 | 攀钢集团江油长城特殊钢有限公司 | Vacuum arc remelting method for inhibiting macrosegregation of high-temperature alloy with high content of Nb |
| CN107584183A (en) * | 2017-08-19 | 2018-01-16 | 江苏标新工业有限公司 | A kind of welding procedure of electroslag furnace dummy electrode |
| CN109702292A (en) * | 2018-12-30 | 2019-05-03 | 西部超导材料科技股份有限公司 | A kind of welding procedure of VAR titan alloy casting ingot |
-
2019
- 2019-12-10 CN CN201911260217.5A patent/CN110935985A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55106679A (en) * | 1979-02-13 | 1980-08-15 | Hitachi Ltd | Arc welding method |
| CN101214571A (en) * | 2007-12-27 | 2008-07-09 | 西北有色金属研究院 | A welding method for electrodes used in vacuum consumable arc melting |
| CN102586648A (en) * | 2012-03-09 | 2012-07-18 | 华北电力大学 | Zirconium alloy material for cathode of direct current arc air plasma torch and preparation method thereof |
| CN102806426A (en) * | 2012-08-06 | 2012-12-05 | 攀钢集团江油长城特殊钢有限公司 | Welding process of auxiliary electrode for vacuum arc remelting furnace |
| CN102912152A (en) * | 2012-09-19 | 2013-02-06 | 攀钢集团江油长城特殊钢有限公司 | Vacuum arc remelting method for inhibiting macrosegregation of high-temperature alloy with high content of Nb |
| CN107584183A (en) * | 2017-08-19 | 2018-01-16 | 江苏标新工业有限公司 | A kind of welding procedure of electroslag furnace dummy electrode |
| CN109702292A (en) * | 2018-12-30 | 2019-05-03 | 西部超导材料科技股份有限公司 | A kind of welding procedure of VAR titan alloy casting ingot |
Non-Patent Citations (1)
| Title |
|---|
| 稀有金属手册编委会: "《稀有金属手册 下册》", 31 December 1995 * |
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Application publication date: 20200331 |