CN115365469A - Rectangular-section thin-wall air duct with stable structure and manufacturing method thereof - Google Patents
Rectangular-section thin-wall air duct with stable structure and manufacturing method thereof Download PDFInfo
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- CN115365469A CN115365469A CN202210927412.4A CN202210927412A CN115365469A CN 115365469 A CN115365469 A CN 115365469A CN 202210927412 A CN202210927412 A CN 202210927412A CN 115365469 A CN115365469 A CN 115365469A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 216
- 239000010959 steel Substances 0.000 claims abstract description 216
- 238000003466 welding Methods 0.000 claims abstract description 73
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 12
- 230000002787 reinforcement Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000010009 beating Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 229910000746 Structural steel Inorganic materials 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005336 cracking Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/14—Plants for continuous casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D45/00—Equipment for casting, not otherwise provided for
- B22D45/005—Evacuation of fumes, dust or waste gases during manipulations in the foundry
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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Abstract
The application provides a rectangular-section thin-wall air duct with a stable structure and a manufacturing method thereof, which relate to the technical field of air ducts and comprise long-side steel plates, short-side steel plates, attaching buckles and equal-side angle steel and reinforcing equal-side angle steel, wherein the short-side steel plates are connected with the long-side steel plates to form a rectangular shape and form four right angles; four attaching button equilateral angle steels are arranged and are connected to four right angles formed by the connection of the short edge steel plates and the long edge steel plates; the reinforced equilateral angle steel is connected to the side surfaces of the long-edge steel plate and the short-edge steel plate. According to the invention, the air duct is welded by attaching the buckle equilateral angle steel and the reinforcing equilateral angle steel, so that the integral strength is greatly improved, the stability of the air duct is improved, and the service life is prolonged; the air duct of the invention is shared by the attaching and buckling equilateral angle steel, thus solving the cracking problem caused by alternating stress; according to the air duct, the two welding seams of the outside attaching buckles and the equilateral angle steel are positioned on the outer sides of the long-edge steel plate and the short-edge steel plate, so that the air duct is not influenced by steam corrosion on the inner sides, leakage can be avoided, and the leakage problem caused by corrosion is solved.
Description
Technical Field
The application relates to the technical field of air ducts, in particular to a rectangular-section thin-wall air duct with a stable structure and a manufacturing method thereof.
Background
A continuous casting machine of a steel plant is provided with a steam discharge system, and a steam discharge fan in the steam discharge system discharges steam generated in the process of casting molten steel out of the roof of the plant through an air duct. The cross section of the air duct is generally rectangular, a steel plate continuous fillet welding structure is adopted, the thickness of the steel plate is generally not more than 5mm (shown in attached figures 1 and 2), the size of the rectangular cross section of the air duct can reach more than 2 m x 1 m, the large-size thin-wall air duct is small in overall strength and easy to deform, and particularly, the four steel plates bear continuously-changed pressure due to the fluctuation of the exhaust steam wind pressure in the steam exhaust process, so that an internal fillet weld bears alternating stress, and fatigue cracks are easy to generate; in addition, the fluorine content in the steam is high, the steam temperature is high, the corrosion and other factors occur in the air duct, and the air duct can crack, leak steam and leak water when the service life exceeds a certain limit. The air leakage problem can occur after the common air duct is used for 3 to 5 years. Because the upward height of the air duct is up to more than 30 meters, once water leakage is not easy to treat, the difficulty in replacing the air duct is higher. For the above reasons, there is a need to improve the stability of the duct in use.
Disclosure of Invention
The invention aims to provide a rectangular-section thin-wall air duct with a stable structure and a manufacturing method thereof, which have the advantages of greatly improving the integral strength, improving the stability of the air duct, prolonging the service life, solving the cracking problem caused by alternating stress and the leakage problem caused by corrosion, and solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a structurally stable rectangular-section thin-walled air duct comprising:
a long-side steel plate; two long-edge steel plates are arranged oppositely;
the two short-edge steel plates are oppositely arranged, the short-edge steel plates are arranged on one sides of the long-edge steel plates and connected with the long-edge steel plates, and the short-edge steel plates are rectangular after being connected with the long-edge steel plates and form four right angles;
four attaching buckle equal-side angle steels are connected to four right-angle positions formed by the short-side steel plates and the long-side steel plates;
consolidate equilateral angle steel, consolidate equilateral angle steel and be equipped with a plurality of to separate the setting, form the interval, consolidate equilateral angle steel connect in long limit steel sheet and minor face steel sheet side.
As a still further scheme of the invention: the interval formed by the reinforced equilateral angle steel is 1.0-1.5 m; the reinforced equal-side angle steel is integrally welded with the long-side steel plate and the short-side steel plate, the length of the reinforced equal-side angle steel is greater than or equal to 40mm, and the thickness of the reinforced equal-side angle steel is greater than or equal to 4mm.
As a still further scheme of the invention: the long edge steel plate is provided with two steel plates which are parallel and oppositely arranged, the short edge steel plate is provided with two steel plates which are parallel and oppositely arranged, the long edge steel plate is rectangular after being connected with the short edge steel plate, four right angles are formed, and inner right-angle welding seams are welded on the inner sides of the four right angles.
As a still further scheme of the invention: the thickness of the long-side steel plate is less than or equal to 5mm, and the thickness of the short-side steel plate is less than or equal to 5mm.
As a still further scheme of the invention: the height of the inner right-angle welding seam is not less than the thickness of the minimum long-side steel plate or the minimum short-side steel plate.
As a still further scheme of the invention: the attaching buckle equal-side angle steel is L-shaped and is connected to the four right-angle outer sides formed by the short-side steel plates and the long-side steel plates after being connected; the length of the attaching button equal-edge angle steel is more than or equal to 50mm, and the thickness of the attaching button equal-edge angle steel is more than or equal to 6mm.
As a still further scheme of the invention: the inner side of each button-attaching equilateral angle steel is provided with a chamfer angle which is 45 degrees.
Based on the same inventive concept, the application also provides a manufacturing method of the rectangular-section thin-wall air duct with the stable structure, and the manufacturing method of the rectangular-section thin-wall air duct with the stable structure comprises the following steps:
the first step is as follows: according to actual requirements, determining the length of a long-side steel plate, the length of a short-side steel plate and the length of a rectangular section, blanking by using a 5mm stainless steel plate, and cutting by using plasma to ensure correct size and tidy trimming; wherein the long-side steel plate and the short-side steel plate are blanked in pairs;
the second step is that: aligning two end parts of each long-edge steel plate and two end parts of each short-edge steel plate to form a rectangular shape, performing spot welding and fixing at 90 degrees at four corners of the rectangle to ensure that four right-angle parts are smooth, cutting lengths of the attaching equal-edge angles, respectively attaching and buckling the four attaching equal-edge angles to the outer sides of the four right-angle parts of the rectangle, performing spot welding and fixing at the outer sides of the right-angle parts to ensure that the attaching surfaces and sides of the right-angle parts and the attaching equal-edge angles are straight and have no deformation;
the third step: backing welding is firstly carried out on four right-angle parts in the rectangle to form inner right-angle welding seams, after the welding is finished, backing welding is carried out on the outer sides of the attaching button equilateral angle steel to form welding seams, and after the welding is finished, the stress is removed by integral beating;
the fourth step: carrying out reinforcement welding on each welding seam according to the sequence of backing welding, and removing stress in the welding process until the height of the welding seam is not less than the thickness of the long-side steel plate or the short-side steel plate;
the fifth step: according to the size after the shaping, the length of intercepting reinforcement equilateral angle steel, the quantity and the interval of reinforcement equilateral angle steel can be arranged according to the actual wind channel, and reinforcement equilateral angle steel and the welding of attaching the button equilateral angle steel become an organic whole, and reinforcement equilateral angle steel length direction carries out intermittent welding with long limit steel sheet and minor face steel sheet, and the weld forms the welding seam to weld with long limit steel sheet and minor face steel sheet become an organic whole.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the air duct, the uniform-side angle steel is adhered and buckled and the uniform-side angle steel is reinforced and welded, so that the overall strength is greatly improved, the stability of the air duct is improved, and the service life is prolonged;
2. the angle welding seam of the air duct is not the only position for bearing the alternating stress any more, and is shared by the attaching button equilateral angle steel, so that the problem of cracking caused by the alternating stress is solved;
3. even if the inner side welding seam of the air duct is corroded to generate a leakage point, two welding seams of the side angle steel of which the outer side is pasted with the button and the like are positioned at the outer sides of the long-side steel plate and the short-side steel plate, so that the air duct is not influenced by the corrosion of the inner side steam, the leakage can be avoided, and the leakage problem caused by corrosion is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.
For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.
Fig. 1 is a schematic structural diagram of a duct in the prior art.
Fig. 2 is a schematic cross-sectional view taken along E-E in fig. 1.
FIG. 3 is a schematic view of a structurally stable thin-walled air duct with a rectangular cross-section according to an embodiment of the present disclosure.
Fig. 4 isbase:Sub>A schematic cross-sectional view taken alongbase:Sub>A-base:Sub>A in fig. 3.
Fig. 5 is a partially enlarged view of B in fig. 4.
The labels in the figure are:
1. a long-side steel plate; 2. short-side steel plates; 3. attaching and buckling equilateral angle steel; 4. reinforcing equal-edge angle steel; 5. an inner fillet weld; 6. and (6) welding.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 3 to 5, an embodiment of the present application provides a structurally stable thin-walled air duct with a rectangular cross section, including:
a long-side steel plate 1; two long-side steel plates 1 are arranged oppositely;
the two short-edge steel plates 2 are arranged oppositely, the short-edge steel plate 2 is arranged on one side of the long-edge steel plate 1 and welded with the long-edge steel plate 1, and the short-edge steel plate 2 and the long-edge steel plate 1 are welded to be rectangular and form four right angles;
the four attaching equal-side angle steels 3 are welded to the four right-angle outer sides formed by welding the short-side steel plates 2 and the long-side steel plates 1, namely the attaching equal-side angle steel 3 is welded to the outer side of each right angle, so that the strength of the air duct is enhanced, and the leakage problem caused by corrosion is solved;
consolidate equilateral angle steel 4, consolidate equilateral angle steel 4 and be equipped with a plurality of to separate the setting, form the interval, consolidate equilateral angle steel 4 and weld in long edge steel sheet 1 and 2 sides of minor face steel sheet, with reinforcing wind channel intensity.
According to the invention, the air duct is welded with the buckling equal-edge angle steel 3 and the reinforcing equal-edge angle steel 4, so that the overall strength is greatly improved, the stability of the air duct is improved, and the service life is prolonged; the corner welding seam 6 of the air duct is not the only position for bearing the alternating stress any more, and is shared by the attaching and buckling equilateral angle steel 3, so that the problem of cracking caused by the alternating stress is greatly improved; even if the welding seams 6 on the inner side of the air duct are corroded to generate leakage points, the two welding seams 6 of the side angle steel 3 adhered and buckled on the outer side are positioned on the outer sides of the long-side steel plate 1 and the short-side steel plate 2, so that the air duct is not influenced by the corrosion of inner side steam, the leakage can be avoided, and the leakage problem caused by corrosion is solved.
In a preferred embodiment of the invention, the space formed by the reinforcing equal angle steel 4 is 1.0-1.5 m, and the space is determined according to actual conditions, for example, when the rectangular section is larger, the space is small, and when the rectangular section is smaller, the space is large; the reinforced equilateral angle steel 4 is welded with the long-edge steel plate 1 and the short-edge steel plate 2 into a whole, specifically, the length of the reinforced equilateral angle steel 4 is more than or equal to 40mm, the thickness of the reinforced equilateral angle steel is more than or equal to 4mm, and the reinforced equilateral angle steel is welded with the long-edge steel plate 1 and the short-edge steel plate 2 together.
According to a preferred embodiment of the invention, two long-side steel plates 1 are arranged in parallel and oppositely, two short-side steel plates 2 are arranged in parallel and oppositely, the long-side steel plates 1 and the short-side steel plates 2 are rectangular after being connected and form four right angles, and inner right-angle welding seams 65 are welded on the inner sides of the four right angles so as to reinforce the connecting strength of the long-side steel plates 1 and the short-side steel plates 2 and prevent air leakage and water leakage; further, the thickness of the long-side steel plate 1 is less than or equal to 5mm, and the thickness of the short-side steel plate 2 is less than or equal to 5mm; further, the height of the inner right-angle weld 65 is not less than the thickness of the minimum long-side steel plate 1 or short-side steel plate 2.
Further, in order to reduce deformation in the welding process, ensure the overall dimension of the air duct and reduce the occurrence of welding stress, after the lap joint positions of the right angle at the inner side and the side angle steel 3 at the outer side of the air duct are fixed by spot welding at the same time, continuous angle welding is started; firstly, backing welding is carried out on lap joint parts in the length direction, the long-side steel plate 1, the short-side steel plate 2 and the reinforced equal-side angle steel 4 are ensured to be closely attached in the welding process, stress is timely removed through beating after welding, the welding seam 6 is reinforced and welded after the four corners are backing welded, and finally the height of the welding seam 6 is not less than the thickness of the minimum steel plate.
In a preferred embodiment of the invention, the attaching and buckling equilateral angle steel 3 is L-shaped and is welded on the four right-angle outer sides formed after the short-side steel plate 2 is connected with the long-side steel plate 1; the length of the attaching button equilateral angle steel 3 is more than or equal to 50mm, and the thickness is more than or equal to 6mm; furthermore, a chamfer angle is arranged on the inner side of the attaching button equilateral angle steel 3, and the chamfer angle is 45 degrees.
Based on the same inventive concept, the application also provides a manufacturing method of the rectangular-section thin-wall air duct with the stable structure, and the manufacturing method of the rectangular-section thin-wall air duct with the stable structure comprises the following steps:
the first step is as follows: according to actual requirements, the length of a long-side steel plate 1, the length of a short-side steel plate 2 and the length of a rectangular section are determined, a stainless steel plate with the thickness of 5mm is used for blanking, plasma cutting is adopted for blanking, the correct size is ensured, and the trimming is tidy; wherein the long-side steel plate 1 and the short-side steel plate 2 are blanked in pairs;
the second step: aligning two end parts of a long-edge steel plate 1 and a short-edge steel plate 2 to form a rectangular shape, performing spot welding and fixing at 90 degrees at four corners of the rectangular shape to ensure that four right-angle parts are smooth, cutting the length of a button-attaching equilateral angle steel 3, wherein four button-attaching equilateral angle steels 3 are required, respectively attaching and fastening the four button-attaching equilateral angle steels 3 to the outer sides of the four right-angle parts of the rectangular shape, performing spot welding and fixing at the outer sides of the right-angle parts to ensure that each attaching surface and side of the right-angle parts and the button-attaching equilateral angle steels 3 are straight and have no deformation;
the third step: backing welding is firstly carried out on four right-angle parts in the rectangle to form an inner right-angle welding seam 65, after the welding is finished, backing welding is carried out on the outer side edge of the attaching equilateral angle steel 3 to form a welding seam 6, and after the welding is finished, the stress is removed by overall beating;
the fourth step: carrying out reinforcement welding on each welding seam 6 according to the sequence of backing welding, and removing stress in the welding process until the height of each welding seam 6 is not less than the thickness of the long-side steel plate 1 or the short-side steel plate 2;
the fifth step: according to the formed size, the length of a reinforcing equal-edge angle 4 is cut, the number and the space of the reinforcing equal-edge angles 4 can be arranged according to an actual air duct, the reinforcing equal-edge angle 4 and a sticking buckle equal-edge angle 3 are welded into a whole, the reinforcing equal-edge angle 4 is intermittently welded with a long-edge steel plate 1 and a short-edge steel plate 2 in the length direction, and a welding seam 6 is formed at the welding position and is welded with the long-edge steel plate 1 and the short-edge steel plate 2 into a whole;
the air duct can be manufactured in sections according to the installation position on site, and butt-welded on site.
According to the invention, the air duct is welded with the buckling equal-edge angle steel 3 and the reinforcing equal-edge angle steel 4, so that the overall strength is greatly improved, the stability of the air duct is improved, and the service life is prolonged; the corner welding seam 6 of the air duct is not the only position for bearing the alternating stress any more, and is shared by the attaching and buckling equilateral angle steel 3, so that the problem of cracking caused by the alternating stress is greatly improved; even if the welding seam 6 on the inner side of the air duct is corroded to generate a leakage point, two welding seams 6 of the angle iron 3 with the same side attached to the outer side are positioned on the outer sides of the long-side steel plate 1 and the short-side steel plate 2, so that the air duct is not influenced by the corrosion of steam on the inner side, the leakage can be avoided, and the leakage problem caused by corrosion is solved.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.
The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (8)
1. The utility model provides a stable in structure's rectangular cross section thin wall wind channel which characterized in that includes:
a long-side steel plate; two long-edge steel plates are arranged oppositely;
the two short-edge steel plates are oppositely arranged, the short-edge steel plates are arranged on one sides of the long-edge steel plates and connected with the long-edge steel plates, and the short-edge steel plates are rectangular after being connected with the long-edge steel plates and form four right angles;
four attaching buckle equal-side angle steels are connected to four right-angle positions formed by the short-side steel plates and the long-side steel plates;
consolidate equilateral angle steel, consolidate equilateral angle steel and be equipped with a plurality of to separate the setting, form the interval, consolidate equilateral angle steel connect in long limit steel sheet and minor face steel sheet side.
2. The structurally stable thin-walled air duct with the rectangular cross section according to claim 1, characterized in that the pitch size formed by the reinforcing equal-sided angle iron is 1.0 to 1.5m; the reinforced equal-side angle steel is integrally welded with the long-side steel plate and the short-side steel plate, the length of the reinforced equal-side angle steel is greater than or equal to 40mm, and the thickness of the reinforced equal-side angle steel is greater than or equal to 4mm.
3. The structurally stable rectangular-section thin-wall air duct according to claim 1, wherein two long-side steel plates are arranged in parallel and oppositely, two short-side steel plates are arranged in parallel and oppositely, the long-side steel plates and the short-side steel plates are rectangular after being connected and form four right angles, and inner right-angle welding seams are welded on the inner sides of the four right angles.
4. A structurally stable, rectangular-section, thin-walled air duct according to claim 3, wherein the thickness of the long-side steel sheet is less than or equal to 5mm and the thickness of the short-side steel sheet is less than or equal to 5mm.
5. A structurally stable rectangular-section thin-walled air duct according to claim 4, wherein the height of the inner fillet weld is not less than the minimum long-side steel plate or short-side steel plate thickness.
6. The structurally stable rectangular-section thin-wall air duct according to claim 1, characterized in that the attachment equilateral angle steel is L-shaped and is connected to four right-angle outer sides formed by the connection of the short-side steel plates and the long-side steel plates; the length of the attaching button equal-edge angle steel is more than or equal to 50mm, and the thickness of the attaching button equal-edge angle steel is more than or equal to 6mm.
7. The structurally stable thin-walled air duct with rectangular cross section as claimed in claim 1, wherein the inside of the equilateral angle steel of the sticking button is provided with a chamfer angle of 45 °.
8. A method for manufacturing a rectangular-section thin-wall air duct with a stable structure, which is based on any one of claims 1 to 7, and comprises the following steps:
the first step is as follows: according to actual requirements, determining the length of a long-side steel plate, the length of a short-side steel plate and the length of a rectangular section, blanking by using a 5mm stainless steel plate, and cutting by using plasma to ensure correct size and tidy trimming; wherein the long-side steel plate and the short-side steel plate are blanked in pairs;
the second step is that: aligning two end parts of each long-edge steel plate and two end parts of each short-edge steel plate to form a rectangular shape, performing spot welding and fixing at 90 degrees at four corners of the rectangle to ensure that four right-angle parts are smooth, cutting lengths of the attaching equal-edge angles, respectively attaching and buckling the four attaching equal-edge angles to the outer sides of the four right-angle parts of the rectangle, performing spot welding and fixing at the outer sides of the right-angle parts to ensure that the attaching surfaces and sides of the right-angle parts and the attaching equal-edge angles are straight and have no deformation;
the third step: backing welding is firstly carried out on four right-angle parts in the rectangle to form inner right-angle welding seams, after the welding is finished, backing welding is carried out on the outer sides of the attaching button equilateral angle steel to form welding seams, and after the welding is finished, the stress is removed by integral beating;
the fourth step: carrying out reinforcement welding on each welding seam according to the sequence of backing welding, and removing stress in the welding process until the height of the welding seam is not less than the thickness of the long-side steel plate or the short-side steel plate;
the fifth step: according to the size after the shaping, the length of intercepting reinforcement equilateral angle steel, the quantity and the interval of reinforcement equilateral angle steel can be arranged according to the actual wind channel, and reinforcement equilateral angle steel and the welding of attaching the button equilateral angle steel become an organic whole, and reinforcement equilateral angle steel length direction carries out intermittent welding with long limit steel sheet and minor face steel sheet, and the weld forms the welding seam to weld with long limit steel sheet and minor face steel sheet become an organic whole.
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