CN111618461A - Targeted welding method for iron-smelting blast furnace equipment - Google Patents
Targeted welding method for iron-smelting blast furnace equipment Download PDFInfo
- Publication number
- CN111618461A CN111618461A CN202010495973.2A CN202010495973A CN111618461A CN 111618461 A CN111618461 A CN 111618461A CN 202010495973 A CN202010495973 A CN 202010495973A CN 111618461 A CN111618461 A CN 111618461A
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- Prior art keywords
- welding
- crack
- blast furnace
- iron
- furnace equipment
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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
- 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
-
- 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
-
- 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
- B23K31/12—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 investigating the properties, e.g. the weldability, of materials
Abstract
The invention relates to the technical field of welding of iron-making blast furnaces, in particular to a targeted welding method of iron-making blast furnace equipment. The method comprises the following steps: look over the crack of parent metal body or the fried seam of original welding seam, know the crack surrounding environment, judge according to the condition: after long-term high temperature, the material is rapidly cooled when meeting heat occasionally, so that the material is changed; repeatedly forming fatigue cracks through long-term stamping expansion and pressure relief shrinkage; mechanically drilling holes at the position of 20mm-50mm around the crack, and taking a base material powder or scrap iron sample; submitting the powder or scrap iron sample to a professional qualified test unit for testing so as to obtain an accurate material report; and selecting materials with the same or higher performance than the same material to weld according to the content of the material report and the requirements of the weld performance. Compared with the prior art, the invention meets the strength requirement of the original welding line by confirming the material of the welding line edge of the parent metal and selecting the material with the same or higher performance for welding.
Description
Technical Field
The invention relates to the technical field of welding of iron-making blast furnaces, in particular to a targeted welding method of iron-making blast furnace equipment.
Background
The welding technology is one of key technologies in the smelting industry and other industries, and aims at the problems that in the production and manufacturing processes of other equipment such as an iron-making blast furnace shell, a hot blast pipeline and the like, the material of a parent metal is changed due to factors such as fatigue caused by long-term high-temperature heating, occasional rapid cooling, stamping and pressure relief, so that a steel body is cracked or an original welding seam is exploded, and due to the change of the material, the original welding process and welding materials cannot meet the original strength and performance requirements, and repeated cracking, welding, re-cracking and re-welding bring great influence to production.
Disclosure of Invention
The invention aims to provide a targeted welding method of iron-making blast furnace equipment.
The invention adopts the following technical scheme:
a targeted welding method of iron-making blast furnace equipment comprises the following steps:
1) look over the crack of parent metal body or the fried seam of original welding seam, know the crack surrounding environment, judge according to following two kinds of circumstances: a. after long-term high temperature, the material is rapidly cooled when meeting heat occasionally, so that the material is changed; b. repeatedly forming fatigue cracks through long-term stamping expansion and pressure relief shrinkage;
2) knowing the material of the raw material according to a design drawing or detailed description;
3) mechanically drilling holes at the position of 20mm-50mm around the crack, and taking a base material powder or scrap iron sample;
4) submitting the powder or scrap iron sample to a professional qualified test unit for testing so as to obtain an accurate material report;
5) and selecting materials with the same or higher performance than the same material to weld according to the content of the material report and the requirements of the weld performance.
Compared with the prior art, the welding method adopting the technical scheme has the advantages that the strength requirement of the original welding line is met by confirming the material of the welding line edge of the parent metal and selecting the material with the same or higher performance for welding.
The preferred scheme of the invention is as follows:
the welding mode adopts gas shielded welding.
The specific welding steps of the gas shielded welding are as follows: back chipping, polishing, preheating, welding, heat preservation and cooling.
Detailed Description
The invention is described in detail below with reference to examples:
example 1:
a targeted welding method of iron-making blast furnace equipment comprises the following steps:
1. looking over the cracks of the parent metal body of the ironmaking blast furnace shell or the explosive cracks of the original welding seams, knowing the surrounding environment of the cracks and judging according to the following two conditions: a. after long-term high temperature, the material is rapidly cooled when meeting heat occasionally, so that the material is changed; b. repeatedly forming fatigue cracks through long-term stamping expansion and pressure relief shrinkage;
2. and according to the judged condition a or condition b, determining the design drawing of the original manufacturer or the detailed description of the original manufacturer, and knowing the material of the raw material.
3. And mechanically drilling holes at the position of 20mm-50mm around the crack, and taking a base material powder or scrap iron sample.
4. And submitting the powder or scrap iron samples to a professional qualified test unit for testing so as to obtain an accurate material report. The material of the furnace shell of each blast furnace is different in design, for example, the material of one blast furnace is Q345, and the material of the other blast furnace is Q235, so the deterioration results are different, and the quality needs to be determined according to the test results.
5. And selecting welding materials with the same or higher performance than the same material for welding according to the content of the material report sheet and the requirements of the performance of the welding seam and the like.
For example, Q345 steel, yield strength: less than or equal to 16 mm: not more than 345 Mpa; 16-40 mm: less than or equal to 335Mpa,40-63mm, less than or equal to 325Mpa,63-80 mm: 315MPa or less, tensile strength: 450 MPa and 630 MPa.
Performing back gouging treatment before welding, wherein the back gouging range is a V-shaped groove of a welding line, and the groove is 45 degrees; the grinding degree requirement is as follows: exposing the natural color of the metal, and having no oil stain on the surface near the welding seam; the preheating mode adopts flame baking and thermometer monitoring, the preheating time is 2-3h, after the welding is finished, the heat preservation time is covered with heat preservation quilt or powder lime, and the mixture is naturally cooled to the normal temperature; the cooling time was about 3 hours.
Example 2:
a targeted welding method of iron-making blast furnace equipment comprises the following steps:
1. look over the crack of hot-blast furnace skin parent metal body or the fried seam of original welding seam, know crack surrounding environment, judge according to following two kinds of circumstances: a. after long-term high temperature, the material is rapidly cooled when meeting heat occasionally, so that the material is changed; b. repeatedly forming fatigue cracks through long-term stamping expansion and pressure relief shrinkage;
2. and according to the judged condition a or condition b, determining the design drawing of the original manufacturer or the detailed description of the original manufacturer, and knowing the material of the raw material.
3. And mechanically drilling holes at the position of 20mm-50mm around the crack, and taking a base material powder or scrap iron sample.
4. And submitting the powder or scrap iron sample to a professional qualified test unit for testing, so as to obtain an accurate material report: the material is exemplified by Q235.
5. And selecting welding materials with the same or higher performance to weld according to the requirements of the content of the material report sheet, the performance of the welding seam and the like. Gas shielded welding is preferentially adopted in welding
Q235 elongation (5/%):
≥26（a≤16mm） ≥25（a>16-40mm） ≥24（a>40-60mm） ≥23（a>60-100mm） ≥22（a>100-150mm） ≥21（a>150mm）
wherein a is the thickness of the steel material, and the elongation is expressed as follows: = (L1-L0)/L0X 100% (wherein: the original nominal length of L0-form mm; the length of gauge length portion after L1-form stretch-breaking mm. when the ratio of the original length of the form to its diameter is 5 or 10, the elongation is represented by 5 and 10, respectively).
Performing back gouging treatment before welding, wherein the back gouging range is as follows: a V-shaped groove of the welding line is 45 degrees; the polishing degree needs to expose the natural color of the metal, and the surface near the welding line has no oil stain; when Q235 is adopted for welding, preheating is generally not needed due to good weldability; heat preservation time-after welding, covering a heat preservation quilt or powder lime, and naturally cooling to normal temperature; the cooling time is-3 h.
Example 3:
1. look over the crack of hot-blast pipeline parent metal body or the fried seam of original welding seam, know crack surrounding environment, judge according to following two kinds of circumstances: a. after long-term high temperature, the material is rapidly cooled when meeting heat occasionally, so that the material is changed; b. repeatedly forming fatigue cracks through long-term stamping expansion and pressure relief shrinkage;
2. and according to the judged condition a or condition b, determining the design drawing of the original manufacturer or the detailed description of the original manufacturer, and knowing the material of the raw material.
3. And mechanically drilling holes at the position of 20mm-50mm around the crack, and taking a base material powder or scrap iron sample.
4. And submitting the powder or scrap iron sample to a professional qualified test unit for testing, so as to obtain an accurate material report: the material is exemplified by Q235.
5. And selecting welding materials with the same or higher performance to weld according to the requirements of the content of the material report sheet, the performance of the welding seam and the like.
Q235 elongation (5/%): not less than 26 (a not more than 16 mm) not less than 25 (a more than 16-40 mm) not less than 24 (a more than 40-60 mm) not less than 23 (a more than 60-100 mm) not less than 22 (a more than 100-150 mm) not less than 21 (a more than 150 mm)
Wherein a is the thickness of the steel material, and the elongation is expressed as follows: = (L1-L0)/L0X 100% (wherein: the original nominal length of L0-form mm; the length of gauge length portion after L1-form stretch-breaking mm. when the ratio of the original length of the form to its diameter is 5 or 10, the elongation is represented by 5 and 10, respectively).
Performing back gouging treatment before welding, wherein the back gouging range is as follows: a V-shaped groove of the welding line is 45 degrees; grinding degree: exposing the natural color of the metal, and having no oil stain on the surface near the welding seam; because the material has good weldability, the material is not preheated generally; and (3) heat preservation time: after welding, covering a heat preservation quilt or powdery lime, and naturally cooling to normal temperature; cooling time-3 h
The above-mentioned embodiments are based on the basic knowledge of welding, welding equipment, welding materials, welding methods of common metals, welding stress and welding deformation, welding defects and inspection of welding quality, and with the rapid development of new technologies, new equipment and new materials, a one-to-one welding process (i.e. target welding) has been developed, that is to say: only aiming at the characteristics of the material at the edge of the welding seam of the parent metal, the welding material with the same or higher performance is selected for welding so as to meet the strength requirement of the original welding seam.
The present invention is not limited to the above-mentioned embodiments, and any embodiments that can be obtained by the above-mentioned steps and methods are considered to be within the scope of the present invention.
Claims (3)
1. A targeted welding method of iron-making blast furnace equipment comprises the following steps:
1) look over the crack of parent metal body or the fried seam of original welding seam, know the crack surrounding environment, judge according to following two kinds of circumstances: a. after long-term high temperature, the material is rapidly cooled when meeting heat occasionally, so that the material is changed; b. repeatedly forming fatigue cracks through long-term stamping expansion and pressure relief shrinkage;
2) knowing the material of the raw material according to a design drawing or detailed description;
3) mechanically drilling holes at the position of 20mm-50mm around the crack, and taking a base material powder or scrap iron sample;
4) submitting the powder or scrap iron sample to a professional qualified test unit for testing so as to obtain an accurate material report;
5) and selecting materials with the same or higher performance than the same material to weld according to the content of the material report and the requirements of the weld performance.
2. The targeted welding method of ironmaking blast furnace equipment according to claim 1, characterized in that: the welding mode adopts gas shielded welding.
3. The targeted welding method of ironmaking blast furnace equipment according to claim 2, characterized in that: the specific welding steps of the gas shielded welding are as follows: back chipping, polishing, preheating, welding, heat preservation and cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495973.2A CN111618461A (en) | 2020-06-03 | 2020-06-03 | Targeted welding method for iron-smelting blast furnace equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495973.2A CN111618461A (en) | 2020-06-03 | 2020-06-03 | Targeted welding method for iron-smelting blast furnace equipment |
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| CN111618461A true CN111618461A (en) | 2020-09-04 |
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| CN202010495973.2A Pending CN111618461A (en) | 2020-06-03 | 2020-06-03 | Targeted welding method for iron-smelting blast furnace equipment |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1867418A (en) * | 2003-10-08 | 2006-11-22 | 新日本制铁株式会社 | Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure |
| CN101612698A (en) * | 2009-07-11 | 2009-12-30 | 刘列 | The method of repairing and welding tuyere sleeve of copper blast furnace |
| CN103994302A (en) * | 2014-05-30 | 2014-08-20 | 山西太钢不锈钢股份有限公司 | Gas pipeline blank repairing, welding and strengthening method |
| CN104551525A (en) * | 2014-12-25 | 2015-04-29 | 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 |
| CN107813051A (en) * | 2017-09-18 | 2018-03-20 | 河北瑞兆激光再制造技术股份有限公司 | Laser melting coating and manual electric arc welding combination restorative procedure after the abrasion of TRT wheel hubs |
-
2020
- 2020-06-03 CN CN202010495973.2A patent/CN111618461A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1867418A (en) * | 2003-10-08 | 2006-11-22 | 新日本制铁株式会社 | Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure |
| CN101612698A (en) * | 2009-07-11 | 2009-12-30 | 刘列 | The method of repairing and welding tuyere sleeve of copper blast furnace |
| CN103994302A (en) * | 2014-05-30 | 2014-08-20 | 山西太钢不锈钢股份有限公司 | Gas pipeline blank repairing, welding and strengthening method |
| CN104551525A (en) * | 2014-12-25 | 2015-04-29 | 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 |
| CN107813051A (en) * | 2017-09-18 | 2018-03-20 | 河北瑞兆激光再制造技术股份有限公司 | Laser melting coating and manual electric arc welding combination restorative procedure after the abrasion of TRT wheel hubs |
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Application publication date: 20200904 |
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