CN111496357A - Transverse welding method for BB41-BF hot blast furnace shell - Google Patents
Transverse welding method for BB41-BF hot blast furnace shell Download PDFInfo
- Publication number
- CN111496357A CN111496357A CN201910090911.0A CN201910090911A CN111496357A CN 111496357 A CN111496357 A CN 111496357A CN 201910090911 A CN201910090911 A CN 201910090911A CN 111496357 A CN111496357 A CN 111496357A
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- welding
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- groove
- hot blast
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Classifications
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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
- B23K9/235—Preliminary treatment
-
- 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
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
-
- 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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- 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
- B23K9/32—Accessories
Abstract
The invention particularly relates to a transverse welding method of a shell of a BB41-BF hot blast furnace, which is characterized by comprising the following steps: the method comprises the steps of performing groove processing on the upper section and the lower section of parts to be welded of a furnace shell of the hot blast furnace, adjusting, assembling and fixing, and clamping a welding gun of carbon dioxide gas shielded welding equipment on an automatic welding trolley; arranging an alumina ceramic electric heating sheet along the groove; welding; and (3) performing postweld heat treatment, immediately arranging an alumina ceramic electric heating sheet along a weld joint after welding, covering asbestos, keeping the temperature for 2.5-5 hours, cooling to room temperature, and performing nondestructive testing on the weld joint. According to the invention, through the automatic welding trolley and the carbon dioxide gas shielded welding equipment, a new welding process of the BB41-BF thick plate is developed, the welding efficiency is greatly improved, the appearance of the welding seam is attractive, and the one-time qualification rate of the welding seam is greatly improved compared with that of manual welding and common automatic welding.
Description
Technical Field
The invention relates to the field of industrial furnace construction, in particular to a transverse welding method for a shell of a BB41-BF hot blast furnace.
Background
The hot blast stove is core equipment matched with a blast furnace of an iron and steel plant and is used for continuously providing high-temperature hot air with the temperature of more than 1000 ℃ for the blast furnace. The hot blast stove comprises a regenerative chamber, a combustion chamber and a wind mixing chamber, and is composed of an outer furnace shell and an inner refractory material. With the requirement of green development of the steel industry, dismantling and new building of an extra-large hot blast stove are imperative. Among them, the furnace shell, which is used as a fixed refractory, a sealed furnace body, and bears thermal stress and internal gas pressure, must be replaced, and the welding quality of the furnace shell has an important influence on the operation life and safety of the hot blast stove. The BB41-BF material thick plate is a novel material thick plate with performance superior to that of Q345C, and is widely applied to multiple blast furnace and hot blast furnace shells in China. The BB41-BF furnace shell is welded by manual arc welding or carbon dioxide gas shielded welding, so that the welding quality control difficulty is high, the welding efficiency is low, and the implementation of energy-saving and environment-friendly transformation of the hot blast stove is seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects of the existing BB41-BF furnace shell welding operation and provides a novel method for welding a furnace shell made of BB41-BF materials.
In order to achieve the above object, the present invention is realized by:
a transverse welding method for the shell of BB41-BF hot-blast stove includes
Step 1, preparing welding, namely performing groove machining on the upper section and the lower section to-be-welded parts of a shell of a hot blast stove made of BB41-BF material, and adjusting, assembling and fixing; removing rust, water and oil stains within the range of 20mm on the surface and two sides of the groove and checking and confirming the rust, water and oil stains; the support rod for clamping the welding gun by the automatic welding machine is modified, lengthened and thickened, and the welding gun of the carbon dioxide gas shielded welding equipment is clamped on the automatic welding trolley;
preheating before welding, arranging 600mm by 180mm alumina ceramic electric heating sheets along the groove, and preheating the welding line at 80-130 ℃;
step 3, welding:
step 3.1, erecting a welding trolley track about 500mm above the welding seam to ensure that the welding gun can swing downwards to the welding seam;
3.2, carrying out clockwise backing welding by adopting gas metal arc welding along the direction of time setting of the upper furnace shell group and the lower furnace shell group at 0 DEG;
3.3, continuously filling the multilayer welding seams and covering by using an erected automatic welding gun;
3.4, firstly welding a side welding seam with a small groove angle, performing inner back gouging after welding, then welding a side welding seam with a large groove angle, integrally polishing along the bottom by using an angle grinder, and then continuously performing welding seam bottoming, continuous filling and capping according to the methods of the steps 3.3) and 3.4);
and 4, performing postweld heat treatment, immediately arranging 600mm × 180mm alumina ceramic electric heating sheets along the welding seams after welding, covering asbestos with the thickness of 30-50mm, preserving heat at the temperature of 645 ℃ for 2.5-5h at 605-.
In the transverse welding process of the BB41-BF hot blast furnace shell, in the step 1, when the thickness of the furnace shell is less than or equal to 30mm, the gap of the groove group pair is less than or equal to 2mm, and when the thickness of the furnace shell is more than 30mm, the gap of the groove group pair is less than or equal to 3 mm.
According to the transverse welding process of the shell of the BB41-BF hot blast stove, in the step 1, a welding seam groove is a K-shaped groove, the angle of the inner groove of the shell is 40-50 degrees, and the angle of the outer groove of the shell is 35-45 degrees and is smaller than the angle of the inner groove of the shell.
In the transverse welding process of the shell of the BB41-BF hot blast stove, the automatic welding trolley in the step 1 is a Huawei HK-100S type automatic welding trolley.
In the transverse welding process of the shell of the BB41-BF hot blast stove, in the step 3, joints among a plurality of layers of continuously filled welding meat layers are required to be staggered by more than 50 mm.
In the transverse welding process of the shell of the BB41-BF hot blast stove, in the step 4, the heating rate of postweld heat treatment is not more than 200 ℃/h, and the cooling rate is not more than 200 ℃/h.
In the transverse welding process of the shell of the BB41-BF hot blast stove, in the step 4, the unqualified weld joint nondestructive test and the repair are required, the cleaning surface of the defect is determined according to the embedding depth of the detected defect, the cleaning length is not less than 50mm, and the cleaning depth is not more than 2/3 of the plate thickness.
According to the transverse welding process of the shell of the BB41-BF hot blast stove, the welding seam is cleaned by adopting a carbon arc air gouging, the gouging groove is ground after the welding seam is cleaned, and then the metallic luster is ground by using an angle grinder so as to carry out welding repair.
According to the invention, through the automatic welding trolley and the carbon dioxide gas shielded welding equipment, a new welding process of the BB41-BF thick plate is developed, the welding efficiency is greatly improved, the appearance of the welding seam is attractive, the one-time qualified rate of the welding seam is greatly improved compared with that of manual welding and common automatic welding, the welding process is safe, reliable, economic and efficient, and reference is provided for welding the thick plate made of the same material.
Detailed Description
The present invention is further illustrated by the following specific examples.
A transverse welding method for the shell of BB41-BF hot-blast stove includes
Step 1, preparing welding, namely performing groove machining on the upper section and the lower section to-be-welded parts of a shell of a hot blast stove made of BB41-BF material, and adjusting, assembling and fixing; removing rust, water and oil stains within the range of 20mm on the surface and two sides of the groove and checking and confirming the rust, water and oil stains; the support rod for clamping the welding gun by the automatic welding machine is modified, lengthened and thickened, and the welding gun of the carbon dioxide gas shielded welding equipment is clamped on the automatic welding trolley;
preheating before welding, arranging 600mm by 180mm alumina ceramic electric heating sheets along the groove, and preheating the welding line at 80-130 ℃;
step 3, welding:
step 3.1, erecting a welding trolley track about 500mm above the welding seam to ensure that the welding gun can swing downwards to the welding seam;
3.2, carrying out clockwise backing welding by adopting gas metal arc welding along the direction of time setting of the upper furnace shell group and the lower furnace shell group at 0 DEG;
3.3, continuously filling the multilayer welding seams and covering by using an erected automatic welding gun;
3.4, firstly welding a side welding seam with a small groove angle, performing inner back gouging after welding, then welding a side welding seam with a large groove angle, integrally polishing along the bottom by using an angle grinder, and then continuously performing welding seam bottoming, continuous filling and capping according to the methods of the steps 3.3) and 3.4);
and 4, performing postweld heat treatment, immediately arranging 600mm × 180mm alumina ceramic electric heating sheets along the welding seams after welding, covering asbestos with the thickness of 30-50mm, preserving heat at the temperature of 645 ℃ for 2.5-5h at 605-.
In the transverse welding process of the BB41-BF hot blast furnace shell, in the step 1, when the thickness of the furnace shell is less than or equal to 30mm, the gap of the groove group pair is less than or equal to 2mm, and when the thickness of the furnace shell is more than 30mm, the gap of the groove group pair is less than or equal to 3 mm.
According to the transverse welding process of the shell of the BB41-BF hot blast stove, in the step 1, a welding seam groove is a K-shaped groove, the angle of the inner groove of the shell is 40-50 degrees, and the angle of the outer groove of the shell is 35-45 degrees and is smaller than the angle of the inner groove of the shell.
In the transverse welding process of the shell of the BB41-BF hot blast stove, the automatic welding trolley in the step 1 is a Huawei HK-100S type automatic welding trolley.
In the transverse welding process of the shell of the BB41-BF hot blast stove, in the step 3, joints among a plurality of layers of continuously filled welding meat layers are required to be staggered by more than 50 mm.
In the transverse welding process of the shell of the BB41-BF hot blast stove, in the step 4, the heating rate of postweld heat treatment is not more than 200 ℃/h, and the cooling rate is not more than 200 ℃/h.
In the transverse welding process of the shell of the BB41-BF hot blast stove, in the step 4, the unqualified weld joint nondestructive test and the repair are required, the cleaning surface of the defect is determined according to the embedding depth of the detected defect, the cleaning length is not less than 50mm, and the cleaning depth is not more than 2/3 of the plate thickness.
According to the transverse welding process of the shell of the BB41-BF hot blast stove, the welding seam is cleaned by adopting a carbon arc air gouging, the gouging groove is ground after the welding seam is cleaned, and then the metallic luster is ground by using an angle grinder so as to carry out welding repair.
The parameters in this embodiment are as follows:
according to the invention, through the automatic welding trolley and the carbon dioxide gas shielded welding equipment, a new welding process of the BB41-BF thick plate is developed, the welding efficiency is greatly improved, the appearance of the welding seam is attractive, the one-time qualified rate of the welding seam is greatly improved compared with that of manual welding and common automatic welding, the welding process is safe, reliable, economic and efficient, and reference is provided for welding the thick plate made of the same material.
Claims (8)
1. A transverse welding method for a shell of a BB41-BF hot blast furnace is characterized by comprising the following steps: comprises that
Step 1, preparing welding, namely performing groove machining on the upper section and the lower section to-be-welded parts of a shell of a hot blast stove made of BB41-BF material, and adjusting, assembling and fixing; removing rust, water and oil stains within the range of 20mm on the surface and two sides of the groove and checking and confirming the rust, water and oil stains; the support rod for clamping the welding gun by the automatic welding machine is modified, lengthened and thickened, and the welding gun of the carbon dioxide gas shielded welding equipment is clamped on the automatic welding trolley;
preheating before welding, arranging 600mm by 180mm alumina ceramic electric heating sheets along the groove, and preheating the welding line at 80-130 ℃;
step 3, welding:
step 3.1, erecting a welding trolley track about 500mm above the welding seam to ensure that the welding gun can swing downwards to the welding seam;
3.2, carrying out clockwise backing welding by adopting gas metal arc welding along the direction of time setting of the upper furnace shell group and the lower furnace shell group at 0 DEG;
3.3, continuously filling the multilayer welding seams and covering by using an erected automatic welding gun;
3.4, firstly welding a side welding seam with a small groove angle, performing inner back gouging after welding, then welding a side welding seam with a large groove angle, integrally polishing along the bottom by using an angle grinder, and then continuously performing welding seam bottoming, continuous filling and capping according to the methods of the steps 3.3) and 3.4);
and 4, performing postweld heat treatment, immediately arranging 600mm × 180mm alumina ceramic electric heating sheets along the welding seams after welding, covering asbestos with the thickness of 30-50mm, preserving heat at the temperature of 645 ℃ for 2.5-5h at 605-.
2. The process of claim 1 for transverse welding of the shell of a BB41-BF hot blast stove, characterized in that: in the step 1, when the thickness of the furnace shell is less than or equal to 30mm, the gap of the groove group is less than or equal to 2mm, and when the thickness of the furnace shell is more than 30mm, the gap of the groove group is less than or equal to 3 mm.
3. The process of claim 1 for transverse welding of the shell of a BB41-BF hot blast stove, characterized in that: in the step 1, the welding seam groove is a K-shaped groove, the angle of the inner groove of the furnace shell is 40-50 degrees, and the angle of the outer groove of the furnace shell is 35-45 degrees and is smaller than the angle of the inner groove of the furnace shell.
4. The process of claim 1 for transverse welding of the shell of a BB41-BF hot blast stove, characterized in that: the automatic welding trolley in the step 1 is a Huawei HK-100S type automatic welding trolley.
5. The process of claim 1 for transverse welding of the shell of a BB41-BF hot blast stove, characterized in that: in step 3, joints among the plurality of continuously filled meat welding layers are required to be staggered by more than 50 mm.
6. The process of claim 1 for transverse welding of the shell of a BB41-BF hot blast stove, characterized in that: in the step 4, the heating rate of the postweld heat treatment is not more than 200 ℃/h, and the cooling rate is not more than 200 ℃/h.
7. The process of claim 1 for transverse welding of the shell of a BB41-BF hot blast stove, characterized in that: in step 4, if the weld joint is unqualified and needs to be repaired, the cleaning surface of the defect is determined according to the embedding depth of the detected defect, the cleaning length is not less than 50mm, and the cleaning depth is not more than 2/3 of the plate thickness.
8. The process of claim 7 for transverse welding of the shell of a BB41-BF hot blast stove, wherein: the cleaning of the welding seam adopts a carbon arc air gouging, the gouging groove is polished after the cleaning, and then the metallic luster is polished by an angle grinder, so that the welding repair can be carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910090911.0A CN111496357A (en) | 2019-01-30 | 2019-01-30 | Transverse welding method for BB41-BF hot blast furnace shell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910090911.0A CN111496357A (en) | 2019-01-30 | 2019-01-30 | Transverse welding method for BB41-BF hot blast furnace shell |
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| CN111496357A true CN111496357A (en) | 2020-08-07 |
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| CN201910090911.0A Pending CN111496357A (en) | 2019-01-30 | 2019-01-30 | Transverse welding method for BB41-BF hot blast furnace shell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112296493A (en) * | 2020-09-21 | 2021-02-02 | 上海宝冶冶金工程有限公司 | Full-automatic blast furnace shell transverse welding process |
| CN113369732A (en) * | 2021-05-27 | 2021-09-10 | 河钢股份有限公司承德分公司 | Heat treatment welding method for converter shell |
Citations (3)
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|---|---|---|---|---|
| JPH01249269A (en) * | 1988-03-29 | 1989-10-04 | Sumitomo Metal Ind Ltd | Method and equipment for welding peripheral directional joint for cylindrical steel structure |
| CN106513948A (en) * | 2017-01-10 | 2017-03-22 | 中通钢构股份有限公司 | Adsorption type tubular column field welding robot |
| CN108115247A (en) * | 2017-12-28 | 2018-06-05 | 安徽马钢设备检修有限公司 | A kind of welding procedure of last furnace shell cross weld |
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2019
- 2019-01-30 CN CN201910090911.0A patent/CN111496357A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01249269A (en) * | 1988-03-29 | 1989-10-04 | Sumitomo Metal Ind Ltd | Method and equipment for welding peripheral directional joint for cylindrical steel structure |
| CN106513948A (en) * | 2017-01-10 | 2017-03-22 | 中通钢构股份有限公司 | Adsorption type tubular column field welding robot |
| CN108115247A (en) * | 2017-12-28 | 2018-06-05 | 安徽马钢设备检修有限公司 | A kind of welding procedure of last furnace shell cross weld |
Non-Patent Citations (3)
| Title |
|---|
| 但泽义 等: "内燃式热风炉炉顶焊后热处理", 《中国金属学会2003中国钢铁年会论文集（2）中国金属学会会议论文集》 * |
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| 章锐等: "马钢2500m~3高炉炉壳焊接工艺 ", 《江苏冶金》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112296493A (en) * | 2020-09-21 | 2021-02-02 | 上海宝冶冶金工程有限公司 | Full-automatic blast furnace shell transverse welding process |
| CN113369732A (en) * | 2021-05-27 | 2021-09-10 | 河钢股份有限公司承德分公司 | Heat treatment welding method for converter shell |
| CN113369732B (en) * | 2021-05-27 | 2024-02-09 | 河钢股份有限公司承德分公司 | Heat treatment welding method for converter shell |
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Application publication date: 20200807 |
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