CN109079358B - Online strengthening method for welding seam of steel shell at vault of blast furnace hot blast stove - Google Patents
Online strengthening method for welding seam of steel shell at vault of blast furnace hot blast stove Download PDFInfo
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- CN109079358B CN109079358B CN201810860639.5A CN201810860639A CN109079358B CN 109079358 B CN109079358 B CN 109079358B CN 201810860639 A CN201810860639 A CN 201810860639A CN 109079358 B CN109079358 B CN 109079358B
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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Abstract
The invention belongs to the technical field of blast furnace smelting, and discloses an online strengthening method for a welding seam of a steel shell at an arch top of a blast furnace hot blast stove, which comprises the following steps: under the condition of combustion operation of the hot blast stove, performing open-slope mouth welding on a welding seam at the cracking part of the arch-top steel shell to ensure that the welding seam does not leak air; covering and welding a plurality of reinforcing plates on the welding seam of the crack part of the vault steel shell; and welding gaps are arranged among the reinforcing plates to form stress release points of the welding structure. The method provided by the invention can realize online efficient weld maintenance.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to an online strengthening method for a welding seam of a steel shell at an arch top of a blast furnace hot blast stove.
Background
The air supply temperature and pressure of the hot blast stove are correspondingly and greatly improved along with the increase of the smelting intensity of the blast furnace, under the condition, the weld joint of the steel dome of the hot blast stove is easy to lose efficacy and crack under the action of NOX, CL-and S-substances and the stress change caused by the burning operation of the hot blast stove, the burning of the steel dome can seriously affect the production operation of the blast furnace, and the unplanned throwing and overhauling of the hot blast stove can also affect the production efficiency of the blast furnace.
According to the invention, two treatment processes are adopted, namely, reinforcing plates are added at intervals on the vault steel shell at the cracking part, or the vault steel shell at the cracking part is continuously added with reinforcing plates by a method, the welding seam of a circle is reserved for 300-500 mm and is not coated as a stress release point, so that the vault steel shell is reinforced on line, and the sealing performance of the welding seam of the vault steel shell is ensured by continuous welding operation of the reinforcing plates and the vault steel shell, so that the online reinforcing effect of the vault steel shell is achieved. The problem that the normal production operation of the hot blast stove is influenced by the crack of the welding seam of the arch top steel shell in the online production operation of the hot blast stove is solved.
Disclosure of Invention
The invention provides an online strengthening method for a welding seam of a steel shell at the vault of a blast furnace, which solves the technical problem that the welding seam of the steel shell at the vault of the blast furnace cannot be reliably processed in an online manner with high time efficiency in the prior art.
In order to solve the technical problem, the invention provides an online strengthening method for a welding seam of a steel shell at the vault of a blast furnace hot blast stove, which comprises the following steps:
under the condition of combustion operation of the hot blast stove, performing open-slope mouth welding on a welding seam at the cracking part of the arch-top steel shell to ensure that the welding seam does not leak air;
covering and welding a plurality of reinforcing plates on the welding seam of the crack part of the vault steel shell;
and welding gaps are arranged among the reinforcing plates to form stress release points of the welding structure.
Further, the step of covering and welding a plurality of reinforcing plates on the welding seam of the crack position of the dome steel shell comprises the following steps:
and arranging matched reinforcing plates according to the form of the cracking part, and covering the reinforcing plates on the welding line of the cracking part of the vault steel shell, wherein a stress release gap is reserved between any adjacent reinforcing plates.
Further, the welding edge of the reinforcing plate and the vault steel shell is an edge which is not staggered with the welding line.
Further, the step of covering and welding a plurality of reinforcing plates on the welding seam of the crack position of the dome steel shell comprises the following steps:
arranging a plurality of continuous mutually abutted reinforcing plates which are matched according to the form of the cracking part, and covering the reinforcing plates on the welding line of the cracking part of the dome steel shell;
wherein a stress relief gap is reserved in the continuous mutually abutted reinforcing plates.
Further, the width of the stress relief gap ranges from 300mm to 500 mm.
Further, the welding edge of the reinforcing plate and the vault steel shell is an edge which is not staggered with the welding line;
and a plurality of totally-enclosed reinforcing plates which are distributed at equal intervals are selected from the continuous mutually abutted reinforcing plates, and all edges of the totally-enclosed reinforcing plates are welded with the vault steel shell.
Furthermore, the range of the equal spacing is 800-1000 mm.
Further, the material of reinforcing plate is the same as or similar to the material of vault steel shell.
Further, the thickness of the reinforcing plate is the same as that of the dome steel shell.
Further, the electrode used in the welding operation is a low-hydrogen type electrode.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the online strengthening method for the welding seam of the steel shell at the vault of the blast furnace, the welding seam at the cracking part of the steel shell at the vault is subjected to open-slope mouth welding under the condition of combustion operation of the hot blast furnace, so that air leakage of the welding seam is avoided; namely, under the condition of maintaining normal operation on line, the crack is firstly sealed in a welding mode; then, covering and welding a plurality of reinforcing plates on the welding seam of the crack part of the vault steel shell, thereby forming a reinforced structure crossing the welding seam, serving as a main bearing structure, avoiding the re-cracking of the welding seam and improving the reinforcing effect; welding gaps are formed among the reinforcing plates to form welding structure stress release points, namely, through the structural form of stress release, the additional structure in the strengthening process is prevented from influencing the structural stress distribution of the arch crown steel shell.
Drawings
FIG. 1 is a schematic diagram illustrating a method for online strengthening of a weld of a steel shell at an arch top of a blast furnace hot blast stove according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a method for online strengthening of a weld of a steel shell at an arch top of a blast furnace hot blast stove according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a reinforcing plate according to an embodiment of the present invention.
Detailed Description
The embodiment of the application provides an online strengthening method for the welding seam of the steel shell at the vault of the blast furnace, and solves the technical problem that the high-aging online reliable treatment cannot be carried out on the welding seam of the steel shell at the vault of the blast furnace in the prior art.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features of the embodiments and examples of the present application may be combined with each other without conflict.
An online strengthening method for a welding seam of a steel shell of a vault of a blast furnace hot blast stove comprises the following steps:
under the condition of combustion operation of the hot blast stove, performing open-slope mouth welding on a welding seam 2 at a cracking part of the vault steel shell 1, ensuring that the welding seam 2 does not leak air, namely plugging the welding seam 2, and ensuring the sealing performance of the vault steel shell 1;
then, covering and welding a plurality of reinforcing plates 3 on the welding seam 2 at the cracking part of the vault steel shell 1, so that a reinforced structure is formed across the welding seam 2 and is used as a force bearing structure to replace the stress of the welding seam area and avoid the stress cracking of the welding seam 2 again;
wherein, set up welding clearance between the polylith reinforcing plate 3, form welded structure stress release point, on the one hand, guarantee to weld additional structure's stability, on the other hand also avoids its stress distribution condition to arch crown steel-shell 1 self.
Referring to fig. 1 and 3, in the first embodiment, the covering and welding of a plurality of reinforcing plates 3 on a weld 2 at a crack position of a dome steel shell 1 comprises:
and arranging matched reinforcing plates 3 according to the form of the cracking part, and covering the reinforcing plates on the welding line 2 of the cracking part of the dome steel shell 1, wherein stress release gaps 7 are reserved between any adjacent reinforcing plates 3, namely a plurality of stress release areas are formed, so that the stability of a welding structure and the stability of stress distribution of the dome steel shell are ensured.
Generally, the covered area of the reinforcing plate 3 can radiate a complete welding seam ring, so that the overall structural strength is ensured, and concentrated stress on the area which is not covered and reinforced is avoided.
Generally, the welding edge of the reinforcing plate 3 and the vault steel shell 1 is an edge which is not staggered with the welding seam 2; namely, the upper edge 4 and the lower edge 5 of the reinforcing plate 3 are respectively welded with the arch crown steel shells 1 at two sides of the welding seam 2, so that stable fixation is realized, and the influence on the stability of the welding seam 2 due to the stress distribution of the reinforcing plate 3 is avoided.
Referring to fig. 3, generally, the reinforcing plate 3 is welded by two portions forming an included angle, respectively corresponding to the areas on both sides of the welding seam 2.
Referring to fig. 2, in the second embodiment, on the basis of the first embodiment, the covering and welding modes of the reinforcing plate 3 are changed.
Specifically, the step of covering and welding a plurality of reinforcing plates 3 on the welding seam 2 of the crack part of the dome steel shell 1 comprises the following steps:
a plurality of continuous mutually abutted reinforcing plates 2 which are matched with each other are arranged according to the form of the cracking part and cover the welding seam 2 of the cracking part of the vault steel shell 1; the coverage area of the reinforcing plate 3 radiates to a complete welding seam ring, so that the whole welding seam area can be reinforced, and the problem of local stress concentration is avoided.
Wherein a stress relief gap 7 is reserved in the successive mutually abutting stiffening webs 3.
Generally, the width of the stress relief gap is in the range of 300mm to 500mm, so that the stability of the reinforcing structure can be maintained while stress relief is ensured.
Further, the welding edge of the reinforcing plate 3 and the vault steel shell 1 is an edge which is not staggered with the welding line; that is, the upper edges 4 and the lower edges 5 of all the reinforcing plates 3 are respectively welded with the arch crown steel shells 1 on the two sides of the welding seam 2, so that stable fixation is realized, and the influence on the stability of the welding seam 2 due to the stress distribution of the reinforcing plates 3 is avoided. Wherein, in the consecutive polylith reinforcing plate 3 that leans on each other, select a plurality of totally closed reinforcing plates of equidistant distribution, all limits of totally closed reinforcing plate all with vault steel-shell 1 welding.
That is, a plurality of reinforcing plates 3 are selected at a certain interval, and all sides of the plurality of reinforcing plates 3 are welded to the dome steel shell 1, that is, the side edges 6 thereof are welded to the dome steel shell 1 in addition to the upper side 4 and the lower side 5 as described above.
Generally, the equal spacing ranges from 800 mm to 1000 mm; usually, the setting distance is rounded according to the length of the reinforcing plate 3.
In general, in order to avoid welding from affecting the physicochemical properties of the dome steel shell 1, the material of the reinforcing plate 3 is the same as or similar to that of the dome steel shell 1. The thickness of the reinforcing plate 3 is the same as that of the dome steel shell 1. The welding rod used in the welding operation is a low-hydrogen type welding rod.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the online strengthening method for the welding seam of the steel shell at the vault of the blast furnace, the welding seam at the cracking part of the steel shell at the vault is subjected to open-slope mouth welding under the condition of combustion operation of the hot blast furnace, so that air leakage of the welding seam is avoided; namely, under the condition of maintaining normal operation on line, the crack is firstly sealed in a welding mode; then, covering and welding a plurality of reinforcing plates on the welding seam of the crack part of the vault steel shell, thereby forming a reinforced structure crossing the welding seam, serving as a main bearing structure, avoiding the re-cracking of the welding seam and improving the reinforcing effect; welding gaps are formed among the reinforcing plates to form welding structure stress release points, namely, through the structural form of stress release, the additional structure in the strengthening process is prevented from influencing the structural stress distribution of the arch crown steel shell.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. An online strengthening method for a welding seam of a steel shell of a vault of a blast furnace hot blast stove is characterized by comprising the following steps:
under the condition of combustion operation of the hot blast stove, performing open-slope mouth welding on a welding seam at the cracking part of the arch-top steel shell to ensure that the welding seam does not leak air;
covering and welding a plurality of reinforcing plates on the welding seam of the crack part of the vault steel shell;
welding gaps are arranged among the reinforcing plates to form stress release points of the welding structure;
the reinforcing plate adopts two parts forming an included angle and is welded corresponding to the areas on two sides of the welding line respectively.
2. The method for strengthening the welding seam of the arch top steel shell of the blast furnace hot blast stove in an online manner as claimed in claim 1, wherein the step of covering and welding a plurality of reinforcing plates on the welding seam of the crack part of the arch top steel shell comprises the following steps:
and arranging matched reinforcing plates according to the form of the cracking part, and covering the reinforcing plates on the welding line of the cracking part of the vault steel shell, wherein a stress release gap is reserved between any adjacent reinforcing plates.
3. The online strengthening method for the welding seam of the steel shell of the arch of the blast furnace hot blast stove as claimed in claim 2, characterized in that: the welding edge of the reinforcing plate and the vault steel shell is an edge which is not staggered with the welding line.
4. The method for strengthening the welding seam of the arch top steel shell of the blast furnace hot blast stove in an online manner as claimed in claim 1, wherein the step of covering and welding a plurality of reinforcing plates on the welding seam of the crack part of the arch top steel shell comprises the following steps:
arranging a plurality of continuous mutually abutted reinforcing plates which are matched according to the form of the cracking part, and covering the reinforcing plates on the welding line of the cracking part of the dome steel shell;
wherein a stress relief gap is reserved in the continuous mutually abutted reinforcing plates.
5. The online strengthening method for the welding seam of the steel shell of the arch of the blast furnace hot blast stove as claimed in claim 4, characterized in that: the width of the stress relief gap is in the range of 300mm to 500 mm.
6. The online strengthening method for the welding seam of the steel shell of the arch of the blast furnace hot blast stove as claimed in claim 5, characterized in that: the welding edge of the reinforcing plate and the vault steel shell is an edge which is not staggered with the welding line;
and a plurality of totally-enclosed reinforcing plates which are distributed at equal intervals are selected from the continuous mutually abutted reinforcing plates, and all edges of the totally-enclosed reinforcing plates are welded with the vault steel shell.
7. The online strengthening method for the welding seam of the steel shell of the arch of the blast furnace hot blast stove as claimed in claim 6, characterized in that: the equal spacing range is 800-1000 mm.
8. The online strengthening method for the welding seam of the steel shell of the vault of the blast furnace hot blast stove as claimed in any one of claims 1 to 7, characterized in that: the material of reinforcing plate is the same as or similar to the material of vault steel shell.
9. The online strengthening method for the welding seam of the steel shell of the arch of the blast furnace hot blast stove as claimed in claim 8, characterized in that: the thickness of the reinforcing plate is the same as that of the vault steel shell.
10. The online strengthening method for the welding seam of the steel shell of the arch of the blast furnace hot blast stove as claimed in claim 8, characterized in that: the welding rod used in the welding operation is a low-hydrogen type welding rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810860639.5A CN109079358B (en) | 2018-08-01 | 2018-08-01 | Online strengthening method for welding seam of steel shell at vault of blast furnace hot blast stove |
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| CN201810860639.5A CN109079358B (en) | 2018-08-01 | 2018-08-01 | Online strengthening method for welding seam of steel shell at vault of blast furnace hot blast stove |
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| CN109079358A CN109079358A (en) | 2018-12-25 |
| CN109079358B true CN109079358B (en) | 2021-03-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5514855A (en) * | 1978-07-17 | 1980-02-01 | Kawasaki Steel Corp | Repairing method for crack in shell of shaft furnace body |
| JP3835304B2 (en) * | 2002-02-20 | 2006-10-18 | Ｊｆｅスチール株式会社 | Iron skin repair method for molten metal smelting furnace |
| CN103292599B (en) * | 2013-05-30 | 2015-03-25 | 山西太钢不锈钢股份有限公司 | Method for repairing housing of hot blast heater in late service period |
| CN103801805B (en) * | 2014-01-21 | 2016-01-20 | 马鞍山马钢设备安装工程有限公司 | A kind of tuyere medium jacket of blast furnace welding repair method |
| CN104551525B (en) * | 2014-12-25 | 2017-01-25 | 安阳钢铁股份有限公司 | Processing method used after cracking of furnace shell of blast furnace |
| CN105057844A (en) * | 2015-08-18 | 2015-11-18 | 无锡乐华自动化科技有限公司 | Welding repair method for cracks on furnace shell of blast furnace |
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