CN111331276A - Welding structure of spherical end socket of boiler barrel and reinforcing plate and manufacturing method - Google Patents
Welding structure of spherical end socket of boiler barrel and reinforcing plate and manufacturing method Download PDFInfo
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- CN111331276A CN111331276A CN202010212638.7A CN202010212638A CN111331276A CN 111331276 A CN111331276 A CN 111331276A CN 202010212638 A CN202010212638 A CN 202010212638A CN 111331276 A CN111331276 A CN 111331276A
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- reinforcing plate
- welding
- end socket
- spherical end
- manhole
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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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a welding structure and a manufacturing method of a spherical end socket and a reinforcing plate of a drum, belonging to the technical field of open pore reinforcement of end sockets of pressure-bearing equipment such as boilers, pressure vessels and the like, and the welding structure and the manufacturing method of the spherical end socket and the reinforcing plate of the drum comprise the following steps: the method is characterized in that the optimization and improvement of the ' center line of a welding seam of the spherical end socket and the reinforcing plate vertical to the axis of the spherical end socket and the axis of the reinforcing plate assembly ' is that the center line of the welding seam is inclined to the axis of the spherical end socket and the reinforcing plate assembly ', and the optimization and improvement of the ' manufacture of the reinforcing plate material of the spherical end socket from a steel plate ' is that the reinforcing plate material of the spherical end socket. So as to reduce the welding workload, reduce the welding deformation and improve the economic benefit and the production efficiency.
Description
Technical Field
The invention relates to a welding structure of a spherical end socket of a boiler barrel and a reinforcing plate, in particular to a welding structure of the spherical end socket of the boiler barrel and the reinforcing plate and a manufacturing method thereof, belonging to the technical field of opening reinforcement of end sockets of pressure-bearing equipment such as boilers, pressure vessels and the like.
Background
For a long time, a U-shaped automatic groove welding structure outside a placed reinforcing plate is adopted for reinforcing a manhole of a spherical end socket of a small-capacity boiler drum, the central line of a groove is always perpendicular to the axis of the spherical end socket and the axis of a reinforcing plate assembly, and the problems of poor local forming of the groove at the side of the spherical end socket, large groove width, more reinforcing plates to be machined and removed, low rigidity, large welding deformation, more welding metal consumption of welding seams and the like exist, and the figure 1 shows.
Disclosure of Invention
The invention aims to provide a welding structure and a manufacturing method of a spherical drum end socket and a reinforcing plate, which aim to solve the problems of large groove processing amount, large wall thickness reduction and poor rigidity of a side welding seam of the reinforcing plate. The width of the groove at the upper part of the welding seam is large and the consumption of welding materials is large for a long time; the reinforcing plate has large welding deformation and low material utilization rate; the assembly welding production efficiency is low, and the economic benefit is poor.
The welding structure of the spherical end socket of the boiler barrel and the reinforcing plate comprises the spherical end socket, a manhole and the reinforcing plate;
a manhole is arranged on one side of the spherical seal head, a reinforcing plate is welded on the outer edge of the manhole, and the center line of a welding seam of a circumferential welding seam between the outer edge of the manhole and the reinforcing plate inclines towards the spherical seal head.
Preferably: the reinforcing plate is a steel plate or a large-caliber thick-wall seamless steel pipe.
Preferably: the vertical center line y1 of the circumferential weld between the outer edge of the manhole and the reinforcing plate is inclined 7.5 degrees to the spherical head.
Preferably: the outer edge weld groove y2 of the manhole is inclined 13.5 degrees to the spherical head.
Preferably: the weld groove y3 on the inner side of the reinforcing plate inclines to the spherical end socket by-1.5 degrees.
The manufacturing method of the welding structure of the spherical end socket of the boiler barrel and the reinforcing plate comprises the following steps:
step one, carrying out hot press forming on a spherical end socket, and marking a groove on the outer edge of a gas cutting manhole and a manhole cover;
step two, performing gas cutting blanking on the reinforcing plate, and turning a groove on the inner side of the reinforcing plate;
and step three, installing welding joints of the welding ball-shaped end sockets and the reinforcing plate on the welding positioner.
And step four, finishing welding and carrying out secondary turning.
Compared with the existing product, the invention has the following effects:
the technical problems of single, old and laggard structure and manufacturing method of the traditional welding seam groove structure of the spherical end socket of the boiler barrel and the reinforcing plate are thoroughly solved. Novel, practical, advanced and reliable.
The method is characterized in that the optimization and improvement of the ' center line of a welding seam of the spherical end socket and the reinforcing plate vertical to the axis of the spherical end socket and the axis of the reinforcing plate assembly ' is that the center line of the welding seam is inclined to the axis of the spherical end socket and the reinforcing plate assembly ', and the optimization and improvement of the ' manufacture of the reinforcing plate material of the spherical end socket from a steel plate ' is that the reinforcing plate material of the spherical end socket. So as to reduce the welding workload, reduce the welding deformation and improve the economic benefit and the production efficiency.
By the welding structure and the manufacturing method of the drum spherical end socket and the reinforcing plate, the welding seam structure and the manufacturing technology of the drum spherical end socket and the reinforcing pipe are innovatively optimized, and the production efficiency and the economic benefit are improved.
Drawings
FIG. 1 is a schematic structural view of a welding structure of a traditional drum spherical head and a reinforcing plate;
FIG. 2 is a schematic structural view of a welding structure of a spherical drum head and a reinforcing plate according to the present invention;
FIG. 3 is a schematic view of a welded structure of a spherical head and a reinforcing plate of a conventional drum;
FIG. 4 is a schematic diagram showing the comparison between the old and new of the welding seam of the spherical drum end socket and the reinforced pipe and plate.
In the figure: 1-spherical end socket, 2-manhole, 3-reinforcing plate, 4-welding seam central line and 5-circumferential welding seam.
Detailed Description
Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings.
In embodiment 1, as shown in fig. 2 and 4, the welding structure of the spherical end enclosure and the reinforcing plate of the drum of the invention comprises a spherical end enclosure 1, a manhole 2 and a reinforcing plate 3;
a manhole 2 is arranged on one side of the spherical seal head 1, a reinforcing plate 3 is welded on the outer edge of the manhole 2, and a weld center line 4 of a circumferential weld 5 between the outer edge of the manhole 2 and the reinforcing plate 3 inclines towards the spherical seal head.
Further: the reinforcing plate 3 is a steel plate or a large-caliber thick-wall seamless steel pipe.
Further: the vertical centre line y1 of the circumferential weld between the outer edge of the manhole 2 and the reinforcement plate 3 is inclined 7.5 deg. to the spherical head 1.
Further: the outer edge weld groove y2 of the manhole 2 is inclined 13.5 degrees to the spherical head 1.
Further: the weld groove y3 on the inner side of the reinforcing plate 3 inclines to the spherical seal head 1 by-1.5 degrees.
A manufacturing method of a welding structure of a spherical end socket and a reinforcing plate of a boiler barrel comprises the following steps:
step one, carrying out hot press forming on a spherical end socket 1, scribing a gas cutting manhole 2, and welding a groove on the outer edge of a manhole 2;
step two, performing gas cutting blanking on the reinforcing plate 3, and turning a groove on the inner side of the reinforcing plate 3;
and step three, installing and welding a welding seam between the spherical seal head 1 and the reinforcing plate 3 on the welding positioner.
And step four, finishing welding and carrying out secondary turning.
The welding structure of the spherical end socket of the boiler barrel and the reinforcing plate and the manufacturing method are shown in figure 2. In fig. 2, 1 is a spherical end socket, 2 is a manhole, 3 is a reinforcing plate, and 4 is a welding seam center line. The reinforcing plate 3 is made of steel plates or large-caliber thick-wall seamless steel pipes, and the central line 4 of the welding seam is determined by linear plane grooves at two sides of the welding seam; because the spherical end socket side is in a curved surface shape, the welding seam groove central line 4 inclines towards the spherical end socket side.
The welding structure of the spherical end socket and the reinforcing plate of a certain boiler barrel is shown in figure 3:
in fig. 3, the inner diameter D1/D of the reinforcing plate for reinforcing the spherical head manhole of a certain boiler barrel SR800 is 695/456mm, the groove bottom of the outer automatic welding seam is a fillet, the groove angle y is 6 degrees, the central line of the reinforcing plate is perpendicular to the central line of the welding seam (groove), and the outer surface of the welding seam is a fillet and the manhole sealing surface is on the inner side of the spherical head.
Therefore, the lower part of the welding groove at the side of the spherical seal head is processed, and the upper part of the welding groove is the surface of the steel plate which is bent outwards, so that the consumption of welding metal is increased. The main manufacturing process flow of the welding assembly of the spherical end socket and the reinforcing plate is as follows: hot press forming of a spherical end enclosure, marking of a gas cutting manhole, welding of a slope opening on the outer side of a vehicle → gas cutting and blanking of a reinforcing plate, turning of a welding groove → loading of a welded spherical end enclosure and a welding seam of the reinforcing plate on a roller frame → secondary turning of an assembly. Because the center line of the automatic welding seam at the outer side of the spherical end socket and the reinforcing plate assembly is perpendicular to the center line of the assembly, the curved surface at the outer side of the spherical end socket can only partially (about 50%) process a 6-degree plane groove; the groove processing amount of the weld on the side of the reinforcing plate is large, the wall thickness is reduced greatly, and the rigidity is poor. The width of the groove at the upper part of the welding seam is large and the consumption of welding materials is large for a long time; the reinforcing plate has large welding deformation and low material utilization rate; the welding production efficiency of the components is low, and the economic benefit is poor.
According to the welding structure of the drum spherical end socket and the reinforcing plate and the manufacturing method thereof, the following technical improvement innovation can be performed, the production efficiency can be improved by 10-15%, the production efficiency and the economic benefit are obviously improved, and the welding structure is shown in fig. 4:
⑴, the vertical center line of the welding seam is properly inclined to the spherical seal head side by y1 which is 7.5 degrees, and the problems of inconsistent and overlarge slope angle of the spherical seal head side are solved;
⑵, properly inclining a groove of a side weld of the spherical seal head to the side of the spherical seal head until y2 is 13.5 degrees, and solving the problems of overlarge processing amount of the reinforcing plate, large weakening rigidity and large welding deformation;
⑶, properly inclining a groove of a welding line on the side of the reinforcing plate to the side of the spherical seal head until y3 is equal to-1.5 degrees, and solving the problems of overlarge processing amount, large rigidity weakening and large welding deformation of the reinforcing plate;
⑷ the reinforcing plate is made of steel plate material and is improved to be made of overstocked large-diameter thick-wall seamless steel pipe to improve the material utilization rate and reduce the capital occupation, and the thick-wall overstocked steel pipe with phi 697 × 125 is selected.
⑸ the welding of the assembly welding seam is changed from the welding on the roller carrier to the welding on the welding positioner, thereby effectively ensuring the welding quality.
The welding structure of a certain spherical end socket and a reinforcing plate and the manufacturing method mainly comprise the following manufacturing process flows: hot press forming of a spherical end enclosure, marking of a gas cutting manhole, welding of a slope opening at the outer side of a vehicle → gas cutting and blanking of a reinforcing pipe, turning of a welding groove → loading of a welding spherical end enclosure and a welding seam of the reinforcing pipe on a welding positioner → secondary turning of an assembly.
After the center line of the weld joint of the assembly in FIG. 4 is changed from the perpendicular line A1 to the oblique line A2, the area of the fusion-welded metal to be welded is changed from B1 to B2, and the area and the revolution volume of B1 are larger than those of B2, so that the welding material is obviously saved.
This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.
Claims (6)
1. Spherical head of a boiler section of thick bamboo and reinforcing plate welded structure, its characterized in that: comprises a spherical end socket (1), a manhole (2) and a reinforcing plate (3);
a manhole (2) is arranged on one side of the spherical seal head (1), a reinforcing plate (3) is welded to the outer edge of the manhole (2), and a weld center line (4) of a circumferential weld (5) between the outer edge of the manhole (2) and the reinforcing plate (3) inclines towards the spherical seal head.
2. The welding structure of the spherical end socket of the boiler barrel and the reinforcing plate as claimed in claim 1, wherein: the reinforcing plate (3) is a steel plate or a large-caliber thick-wall seamless steel pipe.
3. The welding structure of the spherical end socket of the boiler barrel and the reinforcing plate as claimed in claim 1, wherein: the vertical center line y1 of the circumferential welding seam between the outer edge of the manhole (2) and the reinforcing plate (3) inclines to the spherical end socket (1) by 5-10 degrees.
4. The welding structure of the spherical end socket of the boiler barrel and the reinforcing plate as claimed in claim 1, wherein: the outer edge weld groove y2 of the manhole (2) inclines to the spherical seal head (1) by 10-15 degrees.
5. The welding structure of the spherical end socket of the boiler barrel and the reinforcing plate as claimed in claim 1, wherein: the weld groove y3 on the inner side of the reinforcing plate (3) inclines to the spherical end enclosure (1) by 0 to-5 degrees.
6. The manufacturing method of the welding structure of the spherical end socket of the boiler barrel and the reinforcing plate based on any one of claims 1 to 5 is characterized by comprising the following steps of:
step one, carrying out hot press forming on a spherical end socket (1), and marking a gas cutting manhole (2) and welding grooves on the outer edges of a manhole (2) and a manhole cover;
step two, performing gas cutting blanking on the reinforcing plate (3), and turning a groove on the inner side of the reinforcing plate (3);
thirdly, welding joints of the welding ball-shaped seal head (1) and the reinforcing plate (3) are arranged on the welding positioner;
and step four, finishing welding and carrying out secondary turning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010212638.7A CN111331276A (en) | 2020-03-24 | 2020-03-24 | Welding structure of spherical end socket of boiler barrel and reinforcing plate and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010212638.7A CN111331276A (en) | 2020-03-24 | 2020-03-24 | Welding structure of spherical end socket of boiler barrel and reinforcing plate and manufacturing method |
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| CN111331276A true CN111331276A (en) | 2020-06-26 |
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| CN202010212638.7A Pending CN111331276A (en) | 2020-03-24 | 2020-03-24 | Welding structure of spherical end socket of boiler barrel and reinforcing plate and manufacturing method |
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Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2940029A1 (en) * | 1979-10-03 | 1981-04-16 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | CENTRIFUGAL PUMP HOUSING |
| JPH11267858A (en) * | 1998-03-17 | 1999-10-05 | Sumitomo Light Metal Ind Ltd | Friction jointing member and its jointing method, and jointing panel |
| JP2008044003A (en) * | 2006-08-21 | 2008-02-28 | Yoshitaka Aoyama | Projection bolt for circular section member, and welding method for the projection bolt |
| CN102059436A (en) * | 2010-12-16 | 2011-05-18 | 上海森松制药设备工程有限公司 | Protection device for gas-protective welding |
| CN204108532U (en) * | 2014-08-26 | 2015-01-21 | 甘肃蓝科石化高新装备股份有限公司 | A kind of spherical storage tank adapter bevel for welding |
| CN204584518U (en) * | 2015-02-06 | 2015-08-26 | 中国运载火箭技术研究院 | A kind of 5M level store-vessel bottom ring flange automatic welding equipment |
| CN204735816U (en) * | 2015-05-14 | 2015-11-04 | 浙江精工钢结构集团有限公司 | Large -scale spheroid space curved surface groove preparation auxiliary device |
| CN105215519A (en) * | 2015-11-04 | 2016-01-06 | 唐山轨道客车有限责任公司 | The welding method of DHV type weld seam |
| CN106002008A (en) * | 2016-06-07 | 2016-10-12 | 中国水电四局(酒泉)新能源装备有限公司 | Method for welding door frame of ultra-low-temperature high-power wind turbine tower |
| CN205852093U (en) * | 2016-07-14 | 2017-01-04 | 中国核工业第五建设有限公司 | Nuclear power steel containment vessel circumferential weld automatic submerged arc horizontal welding groove |
| CN106735999A (en) * | 2017-01-21 | 2017-05-31 | 中国东方电气集团有限公司 | A kind of variable cross-section groove header base automatic soldering method |
| CN207757111U (en) * | 2017-12-26 | 2018-08-24 | 哈尔滨锅炉厂有限责任公司 | Cross-section welding groove for header saddle-shaped pipe joint |
| CN109175898A (en) * | 2018-09-14 | 2019-01-11 | 哈尔滨锅炉厂有限责任公司 | Bearing device heavy caliber adapter tube hydraulic pressure surplus manufacturing method |
| CN109869706A (en) * | 2018-09-18 | 2019-06-11 | 哈尔滨锅炉厂有限责任公司 | Large capacity rolls drum DIWA353 dome head and its manufacturing method |
| CN209206687U (en) * | 2018-10-17 | 2019-08-06 | 东方电气集团东方锅炉股份有限公司 | A kind of matching tooling for realizing straddling type adapter tube circumferential weld automatic welding |
| CN110142525A (en) * | 2019-05-16 | 2019-08-20 | 东方电气集团东方锅炉股份有限公司 | A kind of big tube socket welding method of straddling type |
| CN209439635U (en) * | 2018-11-22 | 2019-09-27 | 天津市振津石油天然气工程有限公司 | A kind of welding structure of thick-walled pipe and thick wall head |
| CN209532458U (en) * | 2018-12-27 | 2019-10-25 | 哈电集团（秦皇岛）重型装备有限公司 | A kind of pre-processing system with non-centripetal canals |
-
2020
- 2020-03-24 CN CN202010212638.7A patent/CN111331276A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2940029A1 (en) * | 1979-10-03 | 1981-04-16 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | CENTRIFUGAL PUMP HOUSING |
| JPH11267858A (en) * | 1998-03-17 | 1999-10-05 | Sumitomo Light Metal Ind Ltd | Friction jointing member and its jointing method, and jointing panel |
| JP2008044003A (en) * | 2006-08-21 | 2008-02-28 | Yoshitaka Aoyama | Projection bolt for circular section member, and welding method for the projection bolt |
| CN102059436A (en) * | 2010-12-16 | 2011-05-18 | 上海森松制药设备工程有限公司 | Protection device for gas-protective welding |
| CN204108532U (en) * | 2014-08-26 | 2015-01-21 | 甘肃蓝科石化高新装备股份有限公司 | A kind of spherical storage tank adapter bevel for welding |
| CN204584518U (en) * | 2015-02-06 | 2015-08-26 | 中国运载火箭技术研究院 | A kind of 5M level store-vessel bottom ring flange automatic welding equipment |
| CN204735816U (en) * | 2015-05-14 | 2015-11-04 | 浙江精工钢结构集团有限公司 | Large -scale spheroid space curved surface groove preparation auxiliary device |
| CN105215519A (en) * | 2015-11-04 | 2016-01-06 | 唐山轨道客车有限责任公司 | The welding method of DHV type weld seam |
| CN106002008A (en) * | 2016-06-07 | 2016-10-12 | 中国水电四局(酒泉)新能源装备有限公司 | Method for welding door frame of ultra-low-temperature high-power wind turbine tower |
| CN205852093U (en) * | 2016-07-14 | 2017-01-04 | 中国核工业第五建设有限公司 | Nuclear power steel containment vessel circumferential weld automatic submerged arc horizontal welding groove |
| CN106735999A (en) * | 2017-01-21 | 2017-05-31 | 中国东方电气集团有限公司 | A kind of variable cross-section groove header base automatic soldering method |
| CN207757111U (en) * | 2017-12-26 | 2018-08-24 | 哈尔滨锅炉厂有限责任公司 | Cross-section welding groove for header saddle-shaped pipe joint |
| CN109175898A (en) * | 2018-09-14 | 2019-01-11 | 哈尔滨锅炉厂有限责任公司 | Bearing device heavy caliber adapter tube hydraulic pressure surplus manufacturing method |
| CN109869706A (en) * | 2018-09-18 | 2019-06-11 | 哈尔滨锅炉厂有限责任公司 | Large capacity rolls drum DIWA353 dome head and its manufacturing method |
| CN209206687U (en) * | 2018-10-17 | 2019-08-06 | 东方电气集团东方锅炉股份有限公司 | A kind of matching tooling for realizing straddling type adapter tube circumferential weld automatic welding |
| CN209439635U (en) * | 2018-11-22 | 2019-09-27 | 天津市振津石油天然气工程有限公司 | A kind of welding structure of thick-walled pipe and thick wall head |
| CN209532458U (en) * | 2018-12-27 | 2019-10-25 | 哈电集团（秦皇岛）重型装备有限公司 | A kind of pre-processing system with non-centripetal canals |
| CN110142525A (en) * | 2019-05-16 | 2019-08-20 | 东方电气集团东方锅炉股份有限公司 | A kind of big tube socket welding method of straddling type |
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Application publication date: 20200626 |
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