CN113909804B - Construction method for manufacturing stiffening ring of pressure steel pipe - Google Patents
Construction method for manufacturing stiffening ring of pressure steel pipe Download PDFInfo
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- CN113909804B CN113909804B CN202111078153.4A CN202111078153A CN113909804B CN 113909804 B CN113909804 B CN 113909804B CN 202111078153 A CN202111078153 A CN 202111078153A CN 113909804 B CN113909804 B CN 113909804B
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- 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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- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses a method for manufacturing and constructing a stiffening ring of a pressure steel pipe, which comprises the following steps: 1) Taking a pressure steel pipe, cutting the pressure steel pipe along the longitudinal axis direction of the pressure steel pipe in a straight strip mode by using a numerical control cutting machine to form stiffening ring straight strips, wherein the length of each stiffening ring can be split according to the pipe diameter expansion requirement; 2) And rolling the stiffening ring straight strip by adopting a forming machine, so that the stiffening ring radian is formed in the rolling process. The invention greatly reduces the loss rate of the steel plate, reduces the number of splicing welding seams and saves a great amount of construction cost.
Description
Technical Field
The invention belongs to the technical field of manufacturing of steel structures such as pressure steel pipes and the like, and relates to a manufacturing and construction method of a stiffening ring of a pressure steel pipe.
Background
The pressure steel pipe is an important component of a water delivery building in the development and construction of domestic and foreign hydropower stations, and mainly appears in a mode that a main pipe of the pressure steel pipe is matched with a stiffening ring. The pressure steel pipe has higher strength and sealing performance, can effectively bear internal water pressure, and is properly provided with a stiffening ring outside the pipe under the condition of not increasing the wall thickness of the main pipe, and the stiffening ring is used as an annular reinforcing structure welded on the outer wall of the steel pipe. The external pressure resistance stability of the pressure steel pipe can be effectively improved, and the economy is high.
Along with the wide application of the pressure steel pipe, the production and installation engineering quantity is also larger and larger, and in the traditional mode, production and production are carried out by a flame cutting stiffening ring construction method, so that the pressure steel pipe cannot be suitable for the current construction situation with high cost and short construction period, and therefore, how to efficiently produce and install the pressure steel pipe is a subject of research and study in all construction units. Moreover, the construction in the link still cannot get rid of the large loss rate and high cost of the steel plate, and the construction period and economic benefit are seriously influenced.
As shown in fig. 1, the stiffening ring construction adopts a conventional process flow, the blanking is carried out according to the outer arc of the steel pipe, the large-diameter pressure steel pipe is divided into 6-12 segments by cutting in blocks, the vertical postures of the axis of the steel pipe are adopted for assembly, and after the assembly is completed, the number of segments of the stiffening ring is more, so that butt welding seams are increased.
Disclosure of Invention
It is an object of the present invention to address at least the above problems and/or disadvantages and to provide at least the advantages described below.
In order to solve the defects of the existing construction method, the invention provides a construction method for a stiffening ring of a pressure steel pipe, which can replace the traditional construction method for flame cutting the stiffening ring, adopts a numerical control cutting machine to cut and discharge in a straight strip mode, and adopts a forming machine to roll, and can greatly reduce the loss rate of steel plates, reduce the number of spliced welding seams and save the construction cost.
For this purpose, the technical scheme provided by the invention is as follows:
the manufacturing and construction method of the stiffening ring of the pressure steel pipe comprises the following steps:
1) Taking a pressure steel pipe, cutting the pressure steel pipe along the longitudinal axis direction of the pressure steel pipe in a straight strip mode by utilizing a numerical control cutting machine to form stiffening ring straight strips, wherein the length of each stiffening ring can be split according to the pipe diameter expansion requirement;
2) And rolling the stiffening ring straight strip by adopting a forming machine, so that the stiffening ring radian is formed in the rolling process.
Preferably, in the method for manufacturing and constructing the stiffening ring of the pressure steel pipe, in the step 1), the length of each stiffening ring straight bar is 1/2 of the total length of the required stiffening ring, and the stiffening ring straight bars of 2 petals are assembled into a stiffening ring.
Preferably, the method for manufacturing and constructing the stiffening ring of the pressure steel pipe further comprises the following steps:
and assembling the 2 stiffening ring straight strips into a stiffening ring.
Preferably, in the method for manufacturing and constructing the stiffening ring of the pressure steel pipe, the method further comprises the following steps:
the welding auxiliary groove is semicircular, the arc length of the welding auxiliary groove is shorter than that of the stiffening ring straight bar, fixing frames are radially outwards extended at two ends of the welding auxiliary groove, the two welding auxiliary grooves and the bolts fixing the two fixing frames are connected into a closed circular ring shape, a certain gap is reserved between the fixing frames and the stiffening ring butt welding seam, and the certain gap is a space for allowing welding operation of a welding device.
Preferably, in the method for manufacturing and constructing the stiffening ring of the pressure steel pipe, in the step 1), the pressure steel plate is purchased in a fixed size according to the unfolding length of the stiffening ring, and the cutting compensation and the pre-bending amount are calculated in a combined mode.
Preferably, in the construction method for manufacturing the stiffening ring of the pressure steel pipe, before the rolling in the step 2), whether the mechanical property of the parent metal of the stiffening ring is influenced in the rolling process is considered, a process test is carried out according to the curvature radius of the pipe diameter before the construction, the mechanical property and a metallographic sample are carried out, and the process feasibility is determined according to the test result.
In the method for manufacturing and constructing the stiffening ring of the pressure steel pipe, in the step 1), in the blanking process of the stiffening ring straight strip, the length required by straight edge quantity of the end part is directly cut out at the two end parts of the stiffening ring straight strip which is preformed, namely the length Lo of the end part with radian of blanking is more than or equal to 500mm, and the radian of the cutting arc is determined by the curvature radius of the steel pipe.
Preferably, in the construction method for manufacturing the stiffening ring of the pressure steel pipe, the numerical control cutting machine adopts a numerical control rotary three-cutting torch cutting machine.
Preferably, the method for manufacturing and constructing the stiffening ring of the pressure steel pipe further comprises the following steps:
respectively punching two sides of the stiffening ring straight strip to form fixing holes, wherein after rolling, the fixing holes are positioned at two ends of the stiffening ring;
when the stiffening rings are assembled, a reinforcing rib is arranged between two adjacent stiffening rings, and two ends of the reinforcing rib are fixed in fixing holes at one ends of the two adjacent stiffening rings.
The invention at least comprises the following beneficial effects:
1. the invention has high automation level and high efficiency, fully utilizes automatic and intelligent equipment to construct, can greatly reduce the labor investment, reduce the labor intensity and the production cost and improve the manufacturing quality and the production efficiency of the pressure steel pipe.
2. The invention has wide application range and can be suitable for manufacturing stiffening rings at different positions of pressure steel pipes with various pipe diameters.
3. The invention has strong expansibility, and the construction method is not only suitable for manufacturing the stiffening ring of the pressure steel pipe, but also suitable for constructing the annular parts with metal structures such as the thrust ring, the water-stop ring, the flange and the like of the pressure steel pipe.
4. The invention greatly reduces the loss rate of the steel plate, reduces the number of splicing welding seams and saves a great amount of construction cost.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic diagram of a construction method for manufacturing a stiffening ring of a pressure steel pipe before improvement, wherein a is a split assembly schematic diagram of the stiffening ring of the pressure steel pipe, and B is a discharge schematic diagram of the stiffening ring of the pressure steel pipe.
Fig. 2 is a schematic structural diagram of an improved construction method for manufacturing a stiffening ring of a pressure steel pipe according to one embodiment of the present invention, wherein a is a split assembly schematic diagram of the stiffening ring of the pressure steel pipe, and B is a discharge schematic diagram of the stiffening ring of the pressure steel pipe.
Fig. 3 is a schematic diagram illustrating stiffener ring discharging according to one embodiment of the present invention.
Fig. 4 is a schematic diagram of a stiffening ring bar winding according to one embodiment of the present invention.
Fig. 5 is a schematic structural view of a welding auxiliary groove according to one embodiment of the present invention, wherein a is a schematic structural view of a vertical surface of the welding auxiliary groove, and B is a schematic structural view of a use state of the welding auxiliary groove.
FIG. 6 is a graph showing the mechanical test results of stiffening rings according to one embodiment of the present invention.
Fig. 7 is a diagram of a metallographic test result of a stiffening ring according to one embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The invention provides a method for manufacturing and constructing a stiffening ring of a pressure steel pipe, which comprises the following steps:
1) Taking a pressure steel pipe 1 (the pressure steel pipe 1 and the pressure steel pipe 1 to which a stiffening ring is welded are completely made of the same material, so that the pressure steel pipe 1 is convenient to weld outside to play roles of compression resistance, stability and the like, and the material of the pressure steel pipe 1 welded to the pressure steel pipe is consistent), cutting the pressure steel pipe 1 along the longitudinal axis direction of the pressure steel pipe 1 in a straight strip mode by using a numerical control cutting machine to form stiffening ring straight strips, wherein the length of each stiffening ring can be split according to pipe diameter expansion requirements;
2) And rolling the stiffening ring straight strip by adopting a forming machine, so that the stiffening ring radian is formed in the rolling process.
According to the invention, the numerical control cutting machine is used for cutting and blanking in a straight strip mode, and the forming machine is used for rolling, so that the loss rate of the steel plate can be greatly reduced, the number of spliced welding seams is reduced, and the construction cost is saved.
In one of the technical schemes of the invention, in the method for manufacturing and constructing the stiffening ring of the pressure steel pipe 1, in the step 1), the length of each stiffening ring straight bar is 1/2 of the total length of the required stiffening ring, and the stiffening ring straight bars are divided into 2 sections after being assembled. In fig. 1, the outer wall of the pressure steel pipe 1 is welded with stiffening rings with split number of 8, and the number of the stiffening rings is excessive, so that the butt welding seam 2 of the stiffening rings is increased and the welding amount is increased. In fig. 2, the number of the stiffening ring split is 2, and 2 stiffening ring butt welds are formed outside the wall of the pressure steel pipe 1, so that the splitting method greatly reduces the loss rate of the steel plate, reduces the number of the butt welds and obviously reduces the welding amount.
In one of the technical schemes of the present invention, preferably, in step 1), each stiffening ring straight bar has a length of 1/2 of the total length of the required stiffening ring, and the 2-valve stiffening ring straight bars are assembled into a stiffening ring.
In one of the technical schemes of the invention, the method preferably further comprises the following steps:
and assembling the 2 stiffening ring straight strips into a stiffening ring.
In one embodiment of the present invention, preferably, the method further comprises:
the welding auxiliary groove 3 is provided, the inner wall of the welding auxiliary groove 3 is provided with a placing groove 4 along the circumferential direction thereof for accommodating stiffening ring straight bars, the welding auxiliary groove 3 is semicircular, the arc length of the welding auxiliary groove is shorter than that of the stiffening ring straight bars, two ends of the welding auxiliary groove 3 extend outwards along the radial direction thereof to form a fixing frame 5, two the welding auxiliary groove 3 and a bolt 6 for fixing the two fixing frames 5 are connected into a closed circular ring shape, wherein a certain gap is formed between the fixing frame 5 and the stiffening ring butt welding seam 2, and the certain gap is a space for allowing a welding device to perform welding operation.
In one of the technical schemes of the invention, preferably, in the step 1), the adopted pressure steel plates are purchased in a fixed-length manner according to the unfolding length of the stiffening ring, and the cutting compensation and the pre-bending amount are calculated in a combined manner. Ensure that stiffening ring straight bars of proper length are obtained.
In one of the technical schemes of the invention, as a preferable mode, before the rolling of the step 2), whether the mechanical property of the stiffening ring base metal is influenced in the rolling process is considered, a process test is carried out according to the curvature radius of the pipe diameter before construction, the mechanical property and a metallographic sample are carried out, and the process feasibility is determined according to the test result.
In one of the technical schemes of the invention, in the step 1), in the blanking process of the stiffening ring straight strip, the length required by straight edge quantity of the end part is directly cut out at the two end parts of the stiffening ring straight strip which is preformed, namely the length Lo of the end part with radian of blanking is more than or equal to 500mm, and the radian of the cutting arc is determined by the curvature radius of the steel pipe.
In one of the technical schemes of the invention, preferably, the numerical control cutting machine adopts a numerical control rotary three-cutting torch cutting machine. The cutting is quicker and more accurate.
In one of the technical schemes of the invention, the method preferably further comprises the following steps:
respectively punching two sides of the stiffening ring straight strip to form fixing holes, wherein after rolling, the fixing holes are positioned at two ends of the stiffening ring;
when the stiffening rings are assembled, a reinforcing rib is arranged between two adjacent stiffening rings, and two ends of the reinforcing rib are fixed in fixing holes at one ends of the two adjacent stiffening rings. Further enhancing the external pressure resistance stability of the penstock 1 and reducing the cost.
In one of the technical schemes of the invention, preferably, two ends of the reinforcing rib can form an approximately circular expansion part, the fixing hole is matched with the expansion part, a hole is reserved along the edge of the stiffening ring to allow the small-diameter part of the reinforcing rib to pass through, the reinforcing rib is welded in the fixing hole of the stiffening ring through welding, and the compressive force resistance of the pressure steel pipe in the longitudinal axis direction is enhanced.
For a better understanding of the technical solution of the present invention, the following examples are now provided for illustration:
the manufacturing and construction method of the stiffening ring of the pressure steel pipe comprises the following steps:
1) Taking a pressure steel pipe 1, cutting the pressure steel pipe 1 along the longitudinal axis direction of the pressure steel pipe 1 in a straight strip mode by utilizing a numerical control rotary three-cutting torch cutting machine to form stiffening ring straight strips, dividing the length of each stiffening ring according to pipe diameter unfolding requirements, directly cutting the length required by straight edge quantity at the ends of the preformed stiffening ring straight strips in the blanking process of the stiffening ring straight strips, namely, cutting the end length Lo with radian equal to or more than 500mm, wherein the radian of a cutting arc is determined by the curvature radius of the steel pipe. The length of each stiffening ring straight strip is 1/2 of the total length of the required stiffening ring, and the stiffening ring straight strips are split into 2 sections; the adopted pressure steel plate 1 is purchased according to the fixed length of the expansion length of the stiffening ring, and the cutting compensation and the pre-bending amount are calculated in a combined mode.
2) And rolling the stiffening ring straight strip by adopting a forming machine, so that the stiffening ring radian is formed in the rolling process. Before the rolling of the step 2), considering whether the mechanical property of the stiffening ring base metal is influenced in the rolling process, carrying out a process test according to the radius of curvature of the pipe diameter before construction, carrying out mechanical properties and metallographic samples, and determining the process feasibility according to test results.
3) And assembling the 2 stiffening ring straight strips into a stiffening ring. As shown in fig. 5, a welding auxiliary groove is provided, a placement groove 4 is formed on the inner wall of the welding auxiliary groove 3 along the circumferential direction thereof for accommodating stiffening ring straight bars, the welding auxiliary groove 3 is semicircular, the arc length thereof is shorter than that of the stiffening ring straight bars, two ends of the welding auxiliary groove 3 extend radially outwards along the welding auxiliary groove to form a fixing frame 5, two welding auxiliary grooves 3 and bolts 6 for fixing the two fixing frames 5 are connected into a closed circular ring shape, wherein a certain gap is formed between the fixing frame 5 and the stiffening ring butt welding seam 2, and the certain gap is a space for allowing a welding device to perform welding operation. The stiffening ring straight strip can be placed at the position in the placing groove 4 of the welding auxiliary groove 3 according to the required interval, so that when the welding auxiliary groove is fixed outside the pressure steel pipe through the bolt 6, the welding efficiency can be improved rapidly, and the stability of the stiffening ring is improved.
As shown in fig. 2, 3 and 4, the technical scheme adopted by the invention for solving the technical problems is as follows:
(1) Firstly, the stiffening ring blanking is completed by adopting a numerical control cutting machine, but the blanking is not conventionally carried out according to the outer camber lofting. The stiffening ring straight strip is formed by adopting a straight strip form and utilizing a numerical control rotary three-cutting torch numerical control cutting machine, the length of each stiffening ring can be split after being unfolded according to the pipe diameter, and the steel plate after split is purchased in a fixed-length mode according to the unfolding length of the stiffening ring, and the cutting compensation and the pre-bending quantity are considered during split.
(2) And (3) after blanking in the form of stiffening ring straight strips, rolling by adopting a forming machine, so that the radian of the stiffening ring is formed in the rolling process.
(3) According to the curvature radius of the stiffening ring, whether the mechanical property of the stiffening ring base material is influenced in the rolling process is considered before rolling, a process test is required before construction, and the process feasibility is determined according to the process test result.
The specific implementation process is as follows:
(1) Firstly, the stiffening ring blanking is completed by adopting a numerical control cutting machine, but the blanking is not conventionally carried out according to the outer camber lofting. The stiffening ring straight strip is formed by cutting the gun head of the numerical control rotary three-cutting torch numerical control cutting machine for 3 times in a straight strip mode, the length of each stiffening ring is 1/2 of the total length of the stiffening ring, namely, the stiffening rings are split into 2 segments after being assembled. The steel plates are purchased according to the fixed length of the unfolding length of the stiffening ring, and cutting compensation and pre-bending quantity are considered. As shown in fig. 3.
(2) And (3) after blanking in the form of stiffening ring straight strips, rolling by adopting a forming machine, so that the radian of the stiffening ring is formed in the rolling process. Considering that when the stiffening ring is rolled by the forming machine, the end has a straight edge, and the straight edge length is about l=500 mm. Therefore, in the blanking process of the stiffening ring, the two ends of the stiffening ring are directly cut into the required radian, namely, the length Lo of the end part with the radian of the blanking is more than or equal to 500mm, and the radian of the cutting arc is determined by the curvature radius of the steel pipe. As shown in fig. 4.
(3) Before rolling, considering whether the mechanical properties of the stiffening ring base metal are affected or not in the rolling process, carrying out a process test according to the curvature radius of the pipe diameter before construction, carrying out mechanical properties and metallographic samples, and determining the process feasibility according to test results.
The stiffening ring manufactured by the method is sent to a quality supervision and detection center of important casting products of mechanical industrial molding materials for detection, a mechanical detection base [2017]16 is provided, and the obtained mechanical property detection report is shown in the following table, fig. 6 and fig. 7:
mechanical property detection report
The number of modules and the scale of processing described herein are intended to simplify the description of the present invention. The application, modification and variation of the pressure steel tube stiffener ring of the present invention will be apparent to those skilled in the art.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (1)
1. The manufacturing and construction method of the stiffening ring of the pressure steel pipe is characterized by comprising the following steps of:
1) Taking a pressure steel plate, cutting the pressure steel plate along the longitudinal axis direction of the pressure steel plate in a straight strip mode by using a numerical control rotary three-cutting torch cutting machine to form stiffening ring straight strips, dividing the length of each stiffening ring according to the pipe diameter unfolding requirement, wherein the length of each stiffening ring straight strip is 1/2 of the total length of the required stiffening ring, and sizing and purchasing the pressure steel plate according to the stiffening ring unfolding length by combining with calculating the cutting compensation and the pre-bending quantity; in the blanking process of the stiffening ring straight strip, the two end parts of the stiffening ring straight strip are directly cut to obtain the length required by straight edge quantity at the end parts, namely the length Lo of the end part with radian of blanking is more than or equal to 500mm, and the radian of the cutting arc is determined by the curvature radius of the steel pipe; the pressure steel plate, the stiffening ring and the pressure steel pipe to be welded are made of the same material;
2) Rolling the stiffening ring straight strip by adopting a forming machine to form the stiffening ring radian in a rolling process; respectively punching two sides of the stiffening ring straight strip to form fixing holes, wherein after rolling, the fixing holes are positioned at two ends of the stiffening ring;
assembling the straight strips of the 2-valve stiffening ring into a stiffening ring; when the stiffening rings are assembled, a reinforcing rib is arranged between two adjacent stiffening rings, and two ends of the reinforcing rib are fixed in fixing holes at one end of each of the two adjacent stiffening rings;
before the rolling of the step 2), considering whether the mechanical property of the stiffening ring base metal is influenced in the rolling process, carrying out a process test according to the radius of curvature of the pipe diameter before construction, carrying out mechanical properties and metallographic samples, and determining the process feasibility according to test results;
providing a welding auxiliary groove, wherein a placing groove is formed in the inner wall of the welding auxiliary groove along the circumferential direction of the welding auxiliary groove and is used for accommodating stiffening ring straight bars, the welding auxiliary groove is semicircular, the arc length of the welding auxiliary groove is shorter than that of the stiffening ring straight bars, fixing frames are outwards extended along the radial direction of the welding auxiliary groove at two ends of the welding auxiliary groove, the two welding auxiliary grooves and bolts for fixing the two fixing frames are connected into a closed circular ring shape, a certain gap is formed between the fixing frames and stiffening ring butt welding seams, and the certain gap is a space for allowing a welding device to perform welding operation;
the two ends of the reinforcing rib form an approximately circular expansion part, the fixing hole is matched with the expansion part, a hole is reserved along the edge of the stiffening ring to allow the small-diameter part of the reinforcing rib to pass through, the reinforcing rib is welded in the fixing hole of the stiffening ring through welding, and the compressive resistance of the pressure steel pipe on the longitudinal axis is enhanced.
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| JP3226091B2 (en) * | 1997-02-14 | 2001-11-05 | 日立プラント建設株式会社 | Automatic pipe welding equipment |
| KR20090000024U (en) * | 2007-06-28 | 2009-01-07 | 고동일 | pipe welding supporter pipe welding supporter |
| CN102166590A (en) * | 2010-02-26 | 2011-08-31 | 彭智祥 | Annular steel plate and manufacturing process thereof |
| CN207681834U (en) * | 2017-12-23 | 2018-08-03 | 沈阳黎发热能燃机设备配件有限公司 | Gas turbine turbine stator blade sealing ring tooling |
| CN211661443U (en) * | 2020-01-20 | 2020-10-13 | 国泰瑞安股份有限公司 | External butt joint device for welding fire-fighting pipeline |
| CN111136137A (en) * | 2020-02-21 | 2020-05-12 | 泰州康祥机械制造有限公司 | Pressure steel pipe stiffening ring rolling equipment and rolling process |
| CN112570976B (en) * | 2020-12-22 | 2022-09-02 | 中电建路桥集团有限公司 | Semicircle steel pipe fixed-position welding device for steel structure building |
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