Special-shaped coating profile

Abstract

A special-shaped cladding section bar comprises a bottom plate and a main body portion, the bottom plate is a first composite material (1), the main body portion comprises at least one second composite material (2), the second composite material (2) is welded on the first composite material (1) to form a second welding seam (4), the first composite material (1) and the second composite material (2) both comprise core materials (101, 103) and cladding materials (102, 104), the cladding materials (102, 104) are made of stainless steel materials and wrap the core materials (101, 103), and the cladding materials (102, 104) are made of stainless steel materials and wrap the core materials (101, 103). The core materials (101, 103) are made of materials different from those of the coating materials (102, 104), and the depth of the second welding seam (4) is smaller than the thickness of the coating materials (102, 104); the special-shaped coating profile is high in structural strength, low in cost, capable of preventing rust and suitable for outdoor application.

Description

Technical Field

[0001] The invention relates to a special-shaped cladding profile, belonging to the technical field of metal manufacturing. Background Art

[0002] Stainless steel composite materials are usually made of stainless steel as the cladding material and ordinary carbon steel or ordinary low-alloy steel as the base material, and are made into composite materials through metallurgical bonding. This composite material has the advantages of stainless steel's corrosion resistance and rust prevention and ordinary steel's high plasticity and low cost. It has a price advantage that pure stainless steel of the same specification cannot match. Therefore, it is increasingly valued by people. Stainless steel composite plates and stainless steel composite pipes are two typical products of stainless steel composite materials. At present, these two products have been widely used in engineering. Since stainless steel composite materials have a cost-effectiveness that ordinary steel and all-stainless steel cannot match, some other types of stainless steel composite materials have also emerged in recent years.

[0003] There are two main methods for industrial production of stainless steel composite plates: explosive composite and hot-rolled composite. Explosive composite is to overlap the stainless steel plate on the carbon steel substrate, and use a pad to separate the stainless steel plate and the carbon steel substrate to form a certain distance. Explosives are laid flat on the stainless steel plate. The energy of the explosive explosion causes the stainless steel plate to hit the carbon steel substrate at high speed, generating high temperature and high pressure to achieve solid phase welding at the interface of the two materials. Hot-rolled composite is made by rolling the carbon steel substrate and the stainless steel plate in a physically pure state under high vacuum conditions. During the rolling process, the two metals diffuse to achieve complete metallurgical bonding.

[0004] At present, in the Chinese invention patent with patent number CN201910485098.7 of the applicant, a manufacturing method of hot-rolled composite steel and hot-rolled composite steel are disclosed. The manufacturing method designs the dimensions of the cladding tube and the core material so that the inner diameter of the cladding tube is smaller than the outer diameter of the core material, and then heats the cladding tube and combines it with the core material to achieve pressing of the cladding tube and the core material. The operation is convenient, and the cladding tube and the core material are always tightly combined during the rolling process of the composite steel billet after heating, thereby avoiding cracks at the interface between the cladding tube and the core material, thereby obtaining qualified hot-rolled composite steel.

[0005] However, the above manufacturing method is only suitable for manufacturing hot-rolled bars or hot-rolled profiles of various shapes, and cannot directly manufacture composite steel profiles of irregular shapes. Summary of the invention

[0006] The primary technical problem to be solved by the present invention is to provide a special-shaped cladding profile.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] A special-shaped cladding profile, comprising:

[0009] A first composite material, comprising a first core material and a first cladding material, wherein the first cladding material covers the first core material and has different materials;

[0010] A second composite material, comprising a second core material and a second cladding material, wherein the second cladding material covers the second core material and is made of different materials, and the second cladding material is made of the same material as the first cladding material;

[0011] The second composite material is welded to the first composite material to form a weld located in the first cladding material and the second cladding material;

[0012] The depth of the weld is less than the thickness of the first cladding material or the second cladding material.

[0013] Preferably, the weld is a material for welding the cladding material.

[0014] Preferably, the tensile strength of the deposited metal of the solder of the weld is higher than the tensile strength of the deposited metal of the solder required for welding the cladding material.

[0015] Preferably, the first composite material forms the bottom of the special-shaped covering profile, and a plurality of pieces of the second composite material together form the main body of the special-shaped covering profile;

[0016] The weld includes a first weld and a second weld. The first weld is formed by welding the joint of two adjacent second composite materials, and the welding depth of the first weld is less than the thickness of the second cladding material; the second weld is formed by welding the joint of the first composite material and the second composite material, and the welding depth of the second weld is less than the thickness of both the first cladding material and the second cladding material.

[0017] Preferably, the first core material and the first cladding material are formed into one piece through a hot rolling process; and the second core material and the second cladding material are formed into one piece through a hot rolling process.

[0018] Preferably, the main body includes two wing panels and a web, both of which are the second composite material, the two wing panels are parallel to each other, and the two ends of the web are respectively vertically connected to the center lines of the two wing panels to be spliced ​​together into an H-shaped main body.

[0019] Preferably, the misalignment between the wing plate and the web does not exceed 1 mm.

[0020] Preferably, both the first composite material and the second composite material are stainless steel composite plates.

[0021] The present invention has the following technical effects:

[0022] The special-shaped clad profile provided by the technical solution of the present invention solves the technical contradiction that carbon steel is low in cost but not rust-proof, while stainless steel is too expensive. Therefore, the stainless steel composite profile of the present invention is both rust-proof and low in cost, and has high structural strength, which solves the technical problem that the clad profile obtained by the hot rolling process cannot be a special-shaped profile, and is suitable for a wide range of applications, especially for outdoor applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1A A schematic structural diagram of a special-shaped cladding profile provided by an embodiment of the present invention;

[0024] Figure 1B for Figure 1A A partial cross-section of section B;

[0025] Figure 2 A manufacturing flow chart of a special-shaped cladding profile provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The technical content of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Usually, a metal material (located on the surface, the coating material) is coated on another metal material (core material) by using processes such as hot rolling and compression molding. The obtained coated profile can only be a plate, a pipe, etc. due to process limitations and cannot be a special-shaped profile (for example, the contour line is an irregular shape). The present invention utilizes coated plates or pipes to obtain special-shaped coated profiles through welding, and ensures that the coating material on the outer surface is not penetrated during the welding process, so it is possible to break through the process limitations and obtain a variety of special-shaped profiles. It not only utilizes the material advantages of the coated profile, but also reduces the processing cost of the special-shaped profile. The following uses an I-shaped profile of stainless steel coated with carbon steel as an example for explanation.

[0028] Please refer to Figure 1A As shown, a special-shaped clad profile provided by an embodiment of the present invention includes: a first composite material 1 and a second composite material 2, wherein the first composite material 1 constitutes the bottom plate of the special-shaped clad profile, and a plurality of second composite materials 2 together constitute the main body of the special-shaped clad profile. The first composite material 1 and the second composite material 2 both use various carbon steels as core materials to reduce the proportion of stainless steel cladding materials, effectively reduce the overall cost of the product, and use various grades of stainless steel and bidirectional stainless steel as cladding materials, which have a good anti-corrosion effect. It should be noted here that the present invention is not limited to composite plates of carbon steel and stainless steel, as long as the bottom plate and the main body are both composite profiles, and the composite profiles have the same cladding material, which is located on the outer surface of the entire composite profile and is suitable for welding processing. The present invention is not limited to composite plates, and can also be other shapes, such as composite pipes (the cladding material covers the entire tubular core material). Just to describe it more clearly and facilitate understanding, the following only introduces the case of composite plates.

[0029] The composite blank is formed by heating the cladding material and pressing it with the core material, and finally, the composite blank is heated to a certain temperature and then rolled to form the stainless steel composite sheet. Due to the special shape of this product, it is impossible to use carbon steel core material for prefabrication and then roll the stainless steel cladding material, so the present invention splits the stainless steel composite profile into several components, rolls the stainless steel cladding material, and then adopts a special welding method to weld each component into shape.

[0030] Reference Figure 1B As shown, in this embodiment, the first composite material 1 includes a first core material 101 and a first cladding material 102, and the second composite material 2 includes a second core material 103 and a second cladding material 104. In this embodiment, the first core material 101 and the second core material 103 are both made of metal carbon steel, and the first cladding material 102 and the second cladding material 104 are both made of stainless steel pipes. At the same time, referring to FIG. 1 , during specific welding, the joints of multiple pieces of the second composite material 2 are welded to each other to form a first weld 3, and the joints of the first composite material 1 and the second composite material 2 are welded to each other to form a second weld 4.

[0031] It should be understood that stainless steel has good corrosion resistance and is not easy to rust, but its cost is relatively high; metal carbon steel is easy to oxidize and rust, but its cost is relatively low. In this embodiment, a structural form of a cladding material that is not easy to rust is provided on the outside of a cheap and easy to rust core material. At the same time, during welding, the weld does not penetrate the cladding material, so that the core material is not exposed to oxygen, thereby saving the production cost of the stainless steel composite profile while ensuring corrosion resistance.

[0032] In this embodiment, specifically, the bottom plate is a first composite material 1. In this embodiment, the first composite material 1 is a stainless steel composite plate. The bottom plate 1 is rectangular in shape, and four connection holes 11 are opened at four corners of the bottom plate 1, preferably bolt holes. The bolt holes 11 are used to install bolt connectors 12, so as to be connected with other components. In other embodiments, the number and position of the connection holes 11 can be selected according to needs.

[0033] The main body includes a plurality of second composite materials 2. In this embodiment, the second composite material 2 is a stainless steel composite plate. The sizes and specifications of the plurality of second stainless steel composite plates may be the same or different. The plurality of second stainless steel composite plates are spliced ​​together into a set shape, and then the splicing of any two adjacent second stainless steel composite plates is fixed by welding with a set flux to form a first weld 3, so that the plurality of second stainless steel composite plates are welded into a main body of a set shape. Specifically, in this embodiment, the plurality of second stainless steel composite plates include two wing plates 21 and a web plate 22. The two wing plates 21 are rectangular and parallel to each other. The web plate 22 is rectangular and the two ends of the web plate 22 are respectively connected vertically to the midline positions of the two wing plates 21, and the misalignment size between the wing plates 21 and the web plate 22 does not exceed 1 mm, so as to be spliced ​​together into an H-shaped main body. Considering that stainless steel composite components not only need to meet the mechanical properties of the components, but also need to ensure the corrosion resistance of the cladding materials in contact with the corrosive medium, therefore, when assembling welded parts, it is required to align with the cladding materials as the reference, and the misalignment of the cladding surface should not exceed 1mm, especially when assembling stainless composite steel plates of different thicknesses. If the misalignment between the cladding materials is too large, the weld at the root of the base layer may melt part of the stainless steel, increase the alloy elements of the weld metal at the root of the base layer, and make the weld hard and brittle. At the same time, the thickness of the stainless steel at the misaligned joint is reduced, which will reduce the service life, affect the weld quality on the surface of the cladding material, and make it difficult to ensure the corrosion resistance of the welded structure.

[0034] In the above embodiment, the H-shaped main body is a new profile that not only has all the properties of H-shaped steel, but also has very good surface anti-corrosion performance, effectively solving the anti-corrosion problem in a harsh corrosive environment. In this embodiment, the wing plate 21 and the web plate 22 of the H-shaped main body are formed by hot rolling the stainless steel cladding material on the surface and the carbon steel or low-alloy structural steel in the core. That is, the core material is carbon steel or low-alloy structural steel, and the cladding material is stainless steel, and the two are hot-rolled into one.

[0035] The cladding material can be selected from various grades of stainless steel and duplex stainless steel; the core material can be selected from ordinary carbon structural steel and low alloy structural steel (for example: Q235, Q275, Q355, etc.).

[0036] As we all know, the weldability of dissimilar materials mainly depends on the metallurgical compatibility, physical properties, surface state, etc. of the two materials. The greater the difference in these properties between the two or more welded materials, the worse the weldability. In addition, the weldability of dissimilar materials is also related to the welding process, including the size of the welded joint, the groove form, the welding orientation, the welding process parameters, and the operation level of the welding process. The carbon content of carbon steel is higher than that of stainless steel. Welding stainless steel with carbon steel electrodes is prone to intergranular corrosion. Therefore, for welding stainless steel, low-carbon or even ultra-low-carbon stainless steel electrodes should be selected; for welding carbon steel, carbon steel electrodes should be selected. Usually, stainless steel electrodes are not used to weld carbon steel, because long-term contact between stainless steel and carbon steel will produce a "carburizing reaction", which will affect the characteristics of stainless steel.

[0037] In this embodiment, the grade of the welding wire is selected to be a stainless steel welding wire one grade higher than the cladding material (stainless steel as the cladding material 102). That is, the tensile strength of the deposited metal of the solder of the weld is higher than the tensile strength of the deposited metal of the solder required for welding the stainless steel cladding material.

[0038] Thus, the weld is formed by the stainless steel wire welding process, but two pieces of stainless steel composite plates with carbon steel as the core material are welded together. And, as mentioned above, the welding does not penetrate the stainless steel ( Figure 1B As shown in h1 and h2 in the figure, “carburizing reaction” will not occur.

[0039] In this embodiment, the specifications of the H-shaped main body are: 1. Part specifications within the YB3001-2005 standard; 2. Part specifications within the GB / T11263-2005 standard. Part performance meets or exceeds the above two standards. The length, size and tolerance of the product can be equivalent to the standard requirements, part technical requirements, and quality requirements meet or exceed the above two standards.

[0040] In this embodiment, the H-shaped main body has the following advantages:

[0041] 1. The anti-corrosion performance is much higher than the current surface galvanizing, chrome plating and weathering steel;

[0042] Second, in terms of mechanical properties, the internal core material is combined with the external stainless steel cladding material to effectively solve the problem of low strength of all stainless steel by adjusting the type of the internal core material (for example, adjusting the internal core material from Q235 to Q275 or Q355);

[0043] Third, the technical problem that the coated profiles obtained by the hot rolling process can only be plates, pipes, etc. and cannot be special-shaped profiles has been solved.

[0044] When the H-shaped main body is assembled, the contact position of the wing plate 21 and the web plate 22 can be welded and fixed by using a set flux. It can be understood that the H-shaped main body in the above embodiment is only one embodiment. In other embodiments, the shape of the main body can be adaptively changed as needed.

[0045] After the H-shaped main body is welded, the H-shaped main body is placed on the base plate 1 so that the two wing plates 21 and the web plate 22 are in contact with the surface of the base plate 1. At this time, the set flux can be used to weld and fix the positions where the two wing plates 21 and the web plate 22 are in contact with the base plate 1. At this time, the H-shaped main body and the base plate 1 are relatively fixed to form the stainless steel composite profile together.

[0046] In one embodiment, the flux is set to be A132 or A137, and at the same time, the welding depth of the first weld 3 is not greater than the thickness of the cladding material of the second composite material 2, and the welding depth of the second weld 4 is not greater than the thickness of the cladding material of the first composite material 1 and the second composite material 2. Specifically, since the first weld 3 and the second weld 4 in the present application are formed in the cladding material of the stainless steel composite plate, carbon increase should be avoided for welding of the cladding material, because carbon increase of the weld will greatly reduce the corrosion resistance of the stainless composite steel component, so the welding of the cladding material and the cladding material should choose welding rods corresponding to the cladding material, such as A132 or A137. At the same time, during the welding process, the weld depths of the first weld 3 and the second weld 4 are both less than the thickness of the cladding material, and welding to the core substrate should be avoided to prevent damage to the core substrate. Therefore, the welding depths (weld depths) of the first weld 3 and the second weld 4 need to be determined according to the thickness of the cladding material of the first stainless steel composite plate and the thickness of the cladding material of the second stainless steel composite plate. It should be understood that since the coating material will wrap the base layer, if the stainless steel composite plate is placed on a horizontal plane, from a longitudinal cross-section, the stainless steel composite plate includes a three-layer structure of a top coating material, an intermediate base layer and a bottom coating material. The coating material thickness in this embodiment refers to the thickness of the top coating material or the thickness of the bottom coating material.

[0047] In one embodiment, the stainless steel composite profile further includes a plurality of reinforcing ribs 5, the reinforcing ribs 5 are third stainless steel composite plates, and the adjacent two sides of the third stainless steel composite plates are respectively welded and fixed to the wing plate 21 and the bottom plate 1 to form a third weld 6. Specifically, in this embodiment, the reinforcing ribs 5 are in the shape of a right triangle, one right-angled side of the reinforcing ribs 5 is welded and fixed to the wing plate 21, and the other right-angled side of the reinforcing ribs is welded and fixed to the bottom plate 1, wherein the number of the reinforcing ribs 5 can be determined as required, and can be four, eight or more, and at the same time, the position of the reinforcing ribs 5 can also be determined as required. It is easy to understand that in other embodiments, the reinforcing ribs 5 can also be stainless steel composite plates of other shapes.

[0048] In summary, in the embodiment of the present invention, the cladding material can be 36Ti and various other grades, the stainless steel core material is Q295 or Q355 and other grades of low-alloy structural steel, the cross section of the stainless steel composite profile can be sealed with 0.5-1mm thick stainless steel, or welded with welding wire. The inner side of the hole of the stainless steel composite profile can be anti-corrosion by inserting a 1.5-2mm stainless steel sleeve, and both sides are sealed with self-melting welding or stainless steel welding wire.

[0049] The upper part 121 of the bolt connector 12 is made of duplex stainless steel to ensure its tensile strength and corrosion resistance. Because of its short length and low steel consumption, it has the three advantages of ensuring performance, saving precious metals and solving corrosion problems.

[0050] The lower part 123 of the bolt connector 12 is threadedly connected through the intermediate connecting part 122, wherein the upper part 121, the intermediate connecting part 122 and the lower part 123 all have high-strength connecting threads, thereby, through the threaded connection, the lower part 123 of the bolt connector 12 is mechanically connected to the upper part 121. Since the lower part 123 is longer, it can be better buried in the ground, so that the duplex stainless steel material can be reasonably saved to save costs. Among them, the intermediate connecting part 122 is a stainless steel nut, and its force strength reaches the same level of carbon steel nuts, and the stainless steel nut is a double nut.

[0051] In the specific construction process, the use of the stainless steel composite profile can effectively solve the anti-corrosion problem. At the same time, it can save about 8% of precious high-end stainless steel metal materials and effectively reduce production costs.

[0052] Reference Figure 2 As shown, a method for manufacturing a special-shaped cladding profile provided by an embodiment of the present invention specifically comprises the following steps:

[0053] S10, using the first stainless steel composite plate 1 as a bottom plate, and opening connection holes 11 on the bottom plate 1 for connection with other components.

[0054] Specifically, a rectangular first stainless steel composite plate of appropriate thickness is selected as the bottom plate 1, and then connecting holes 11 are respectively opened at the four corners of the rectangular bottom plate 1, and the size of the connecting hole is determined according to the size of the connecting piece.

[0055] S20, splicing a plurality of second stainless steel composite plates 2 to form a main body of a set shape.

[0056] Specifically, two second stainless steel composite plates of the same size are selected as the wing plates 21, and another second stainless steel composite plate of the same size as the wing plates 21 is selected as the web plate 22, wherein the length of the web plate 22 is equal to the length of the wing plates 21. When splicing, the two wing plates 21 are placed parallel to each other in advance, and then the web plate 22 is inserted between the two wing plates 21, so that the two ends of the web plate 22 are respectively vertically connected to the midline positions of the two wing plates 21, so as to be spliced ​​together into an H-shaped main body.

[0057] S30, using a set flux to weld and fix the joints of any two adjacent second stainless steel composite plates to form a first weld 3.

[0058] Specifically, after the H-shaped main body is spliced, the joints where the two wing plates 21 and the web plate 22 are in contact are welded and fixed by using A132 or A137, thereby forming a first weld 3.

[0059] S40, placing the welded main body 2 on the first stainless steel composite plate 1.

[0060] Specifically, after the main body 2 is welded, the H-shaped main body is placed on the first stainless steel composite plate 1 , so that the two wing plates 21 and the web plate 22 are in contact with the first stainless steel composite plate 1 .

[0061] S50 , using the set flux to continue welding and fixing any second stainless steel composite plate at the contact position with the first stainless steel composite plate to form a second weld 4 .

[0062] Specifically, after the main body 2 is placed on the first stainless steel composite plate 1 , two wing plates 21 and one web plate 22 are welded and fixed at positions where they contact the first stainless steel composite plate 1 using A132 or A137, thereby forming a second weld 4 .

[0063] S60, using the third stainless steel composite plate as a reinforcing rib 5, and respectively welding two adjacent sides of the reinforcing rib 5 to the main body 1 and the bottom plate 2 by flux to form a third weld 6.

[0064] Specifically, a third stainless steel composite plate in the shape of a right-angled triangle is selected as the reinforcing rib 5, and one right-angled side of the reinforcing rib 5 is welded to the wing plate 21, and at the same time, the other right-angled side of the reinforcing rib 5 is welded to the bottom plate 1, wherein a third weld 6 is formed at the position where the two right-angled sides of the reinforcing rib 5 contact the wing plate 21 and the bottom plate 1.

[0065] S70, using a stainless steel wire brush to clean the first weld 3, the second weld 4 and the third weld 6 to prevent impurities from remaining on the surface of the stainless steel composite profile.

[0066] The present invention is described in detail above. For those skilled in the art, any obvious changes made to the present invention without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and the corresponding legal liability will be borne.

Claims

1. A special-shaped coating profile, characterized in that: include: A first composite material, comprising a first core material and a first cladding material, wherein the first cladding material covers the first core material and has different materials; A second composite material, comprising a second core material and a second cladding material, wherein the second cladding material covers the second core material and is made of different materials, and the second cladding material is made of the same material as the first cladding material; The second composite material is welded to the first composite material to form a weld located in the first cladding material and the second cladding material; The depth of the weld is no greater than the thickness of the first cladding material and the second cladding material, The tensile strength of the deposited metal of the solder of the weld is higher than the tensile strength of the deposited metal of the solder required for welding the cladding material.

2. The special-shaped cladding profile according to claim 1, characterized in that: The weld is a material for welding the cladding material.

3. The special-shaped cladding profile according to claim 1, characterized in that: The first composite material constitutes the bottom of the special-shaped cladding profile, and multiple pieces of the second composite materials together constitute the main body of the special-shaped cladding profile; the weld includes a first weld and a second weld, and the joint of two adjacent second composite materials is welded to form the first weld, and the welding depth of the first weld is less than the thickness of the second cladding material; the joint of the first composite material and the second composite material is welded to form the second weld, and the welding depth of the second weld is less than the thickness of the first cladding material and the second cladding material at the same time.

4. The special-shaped cladding profile according to claim 1, characterized in that: The first core material and the first cladding material are formed into one piece through a hot rolling process; the second core material and the second cladding material are formed into one piece through a hot rolling process.

5. The special-shaped cladding profile according to claim 4, characterized in that: The main body includes two wing plates and a web, both of which are the second composite material. The two wing plates are parallel to each other, and the two ends of the web are vertically connected to the center line of the two wing plates to be spliced ​​together into an H-shaped main body.

6. The special-shaped cladding profile according to claim 5, characterized in that: The misalignment between the wing plate and the web plate does not exceed 1 mm.

7. The special-shaped cladding profile according to claim 1, characterized in that: The first composite material and the second composite material are both stainless steel composite plates.

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