Clad sheet and manufacturing method thereof

Abstract

The clad plate according to the present invention is characterized by comprising: a carbon steel plate; a metal plate; a metal pattern layer including one or more metal patterns located between the carbon steel plate and the metal plate; and a welded portion connecting the metal pattern layer and the metal plate.

Description

Technology Field

[0001] The present invention relates to a clad plate and a method for manufacturing the same. Background Technology

[0002] Titanium has excellent corrosion resistance and is used in marine equipment, heat exchangers, and chemical equipment where corrosion resistance is required. However, because it is a very expensive material, titanium is often used in combination with other materials that are relatively cheaper rather than being used alone.

[0003] Generally, clad plates or clad materials are made by joining plates of different materials surface-wise. Depending on the application, they are manufactured in various combinations of materials and multiple layers, such as double-layer stacking of Cu-Al, STS-Al, STS-Cu, Ti-Al, Mg-Al, etc., and triple-layer stacking of STS / Al / STS, Ti / Al / STS, etc.

[0004] To manufacture such clad plates, it is essential to perform surface joining between plates, or to perform multiple line joining or multiple surface joining.

[0005] Currently, the most widely used technology for manufacturing clad plates is the roll cladding method, in which bonding materials are layered between upper and lower rolls and clad by applying a load at a certain temperature; other methods such as explosive welding and resistance seam welding are also used.

[0006] Roll cladding is a method suitable for mass production, but it has the disadvantage of very high equipment costs because it requires equipment capable of precisely controlling load or position under high load conditions in the planar direction of the two materials.

[0007] Explosive welding has the advantage of not requiring large-scale equipment, but it has the disadvantage of generating significant noise during joining and posing some risk due to the energy source of the explosives.

[0008] Resistance seam welding has the advantage of allowing structures to be manufactured by welding only the necessary parts rather than the entire surface; however, because it is a form of fusion welding, intermetallic compounds are formed from the combination of the two materials being joined, resulting in a disadvantage where mechanical properties deteriorate at the joint after cladding.

[0009] Therefore, there is a need to develop a method for manufacturing clad plates that is relatively simple and low-cost. The problem to be solved

[0010] The present invention aims to provide a clad plate with excellent bonding strength and suppressed formation of intermetallic compounds between a carbon steel plate and a metal plate.

[0011] In addition, the present invention aims to provide a method for manufacturing a clad plate that can suppress the formation of intermetallic compounds between a carbon steel plate and a metal plate, and can manufacture a clad plate with excellent bonding strength in a relatively simple manner while reducing process costs. means of solving the problem

[0012] The present invention provides a clad plate comprising: a carbon steel plate; a metal plate; a metal pattern layer having one or more metal patterns located between the carbon steel plate and the metal plate; and a welded portion connecting the metal pattern layer and the metal plate.

[0013] In addition, the present invention provides a method for manufacturing a clad plate, comprising the steps of: forming a metal pattern layer including one or more metal patterns by low-temperature spraying metal powder onto at least one surface of a carbon steel plate; placing a metal plate on top of the carbon steel plate on which the metal pattern layer is formed; and overlapping welding the metal pattern layer and the metal plate. Effects of the invention

[0014] The clad plate according to the present invention has the advantage of suppressing the formation of intermetallic compounds between the carbon steel plate and the metal plate, and having excellent bonding strength.

[0015] In addition, the method for manufacturing a clad plate according to the present invention has the advantage of being able to suppress the formation of intermetallic compounds between a carbon steel plate and a metal plate, and to manufacture a clad plate with excellent bonding strength in a relatively simple manner while reducing process costs. Brief explanation of the drawing

[0016] FIGS. 1 and 2 are images illustrating a method for manufacturing a clad plate according to some embodiments of the present invention. Figure 3 is an optical microscope (OM) image of titanium clad plates manufactured according to the examples and comparative examples. FIG. 4 is a diagram illustrating a method for manufacturing a clad plate according to some embodiments of the present invention. FIG. 5 is an image illustrating a case in which a cylindrical pipe is manufactured using a clad plate according to some embodiments of the present invention. Specific details for implementing the invention

[0017] Hereinafter, embodiments of the present invention will be described in detail. However, these are presented as examples and are not intended to limit the present invention, and the present invention is defined only by the scope of the claims set forth below.

[0018] In the present invention, when it is stated that a certain member is located "on" another member, this includes not only cases where a certain member is in direct contact with another member, but also cases where another member is interposed between the two members.

[0019] In the present invention, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0021] Clad board

[0022] One aspect of the present invention relates to a clad plate (100) comprising: a carbon steel plate (10); a metal plate (20); a metal pattern layer (30) having one or more metal patterns (31) located between the carbon steel plate (10) and the metal plate (20); and a weld (40) connecting the metal pattern layer (30) and the metal plate (20).

[0023] The clad plate (100) according to the present invention includes a metal pattern layer (30) comprising one or more metal patterns (31) located between a carbon steel plate (10) and a metal plate (20), and includes a welded portion (40) connecting the metal pattern layer (30) and the metal plate (20), thereby having excellent bonding quality and the advantage that no intermetallic compounds are included between the carbon steel plate (10) and the metal plate (20).

[0025] Carbon steel sheet

[0026] The clad plate (100) according to the present invention includes a carbon steel plate (10).

[0027] The carbon steel plate (10) may have a carbon content of 0.02 to 2.11 weight%, specifically 0.2 to 0.5 weight%. More specifically, S45C (carbon content: 0.40 to 0.50 weight%) or SS400 (carbon content: 0.2 to 0.3 weight%) may be used, but is not limited thereto.

[0028] However, if the carbon content of the carbon steel plate (10) satisfies the above range, it is desirable because the mechanical strength of the carbon steel plate (10) is excellent and the corrosion resistance is excellent.

[0030] The carbon steel plate (10) may further include one or more selected from the group consisting of silicon, manganese, phosphorus and sulfur, but is not limited thereto.

[0031] The above silicon may be included in an amount of 0.5 weight% or less, but is not limited thereto.

[0032] The above manganese may be included in an amount of 0.6 weight% or less, but is not limited thereto.

[0033] The above phosphorus may be included in an amount of 0.1 weight% or less, but is not limited thereto.

[0034] The above sulfur may be included in an amount of 0.045 weight% or less, but is not limited thereto.

[0036] The carbon steel plate (10) may have a tensile strength of 200 to 600 MPa.

[0037] It is desirable that the tensile strength of the carbon steel plate (10) satisfies the above range, thereby suppressing deformation caused by external force and improving the stability of the titanium cladding plate.

[0039] The carbon steel plate (10) may have a fracture elongation of 15 to 38%.

[0040] It is desirable that when the fracture elongation rate of the carbon steel plate (10) satisfies the above range, it has a certain degree of deformability, thereby suppressing the phenomenon of fracture after slight deformation occurs, which can improve the stability of the titanium cladding plate.

[0042] The carbon steel plate (10) may have a thickness of 0.1 to 20 mm, preferably 0.5 to 15 mm, and more preferably 1 to 10 mm.

[0043] If the thickness of the carbon steel plate (10) satisfies the above range, the clad plate (100) including the carbon steel plate (10) can have high strength and impact toughness, which is desirable.

[0045] metal sheet

[0046] The clad plate (100) according to the present invention includes a metal plate (20).

[0047] In another embodiment of the present invention, the metal plate (20) may comprise one or more selected from the group consisting of titanium, titanium alloy, zirconium, zirconium alloy, tantalum and tantalum alloy.

[0048] In another embodiment of the present invention, the metal plate (20) may be a titanium plate.

[0049] In short, the clad plate (100) according to the present invention may be a titanium clad plate.

[0050] The above titanium plate (20) may contain 99.5 weight percent or more of titanium.

[0051] Specifically, the titanium plate (20) may be hot-rolled or cold-rolled to grades 1, 2, 3, and 4 of commercially sold pure titanium (CP-Ti), and may be annealed after rolling, but is not limited thereto.

[0052] The above titanium plate (20) may be composed of 0 to 0.5 weight% iron, 0 to 0.4 weight% oxygen, 0 to 0.08 weight% carbon, 0 to 0.015 weight% hydrogen, 0 to 0.05 weight% nitrogen, and the remainder being titanium and other impurities.

[0053] When the composition of the titanium plate (20) satisfies the above range, it is desirable because the clad plate (100) including the titanium plate (20) has excellent formability and excellent mechanical properties.

[0055] The metal plate (20) may have a thickness of 0.05 to 5 mm, preferably 0.1 to 3 mm.

[0056] It is desirable that if the thickness of the metal plate (20) satisfies the above range, an economical and corrosion-resistant clad plate (100) can be obtained.

[0058] metal pattern layer

[0059] The clad plate (100) according to the present invention includes a metal pattern layer (30) comprising one or more metal patterns (31) located between the carbon steel plate (10) and the metal plate (20).

[0060] In one embodiment of the present invention, the metal pattern layer (30) may include one or more metals selected from the group consisting of titanium, titanium alloy, zirconium, zirconium alloy, tantalum, tantalum alloy, copper, nickel, and silver.

[0061] Specifically, the metal pattern layer (30) may include titanium.

[0062] When the metal pattern layer (30) includes titanium, it is desirable that the bonding strength between the metal pattern layer (30) including titanium and the carbon steel plate (10) is excellent.

[0063] More specifically, the metal pattern layer (30) can be formed in the form of powder of the aforementioned metal.

[0064] The metal pattern layer (30) is distinguished from a metal strip, and the metal pattern layer (30) according to the present invention has the advantage of being able to easily adjust the width and thickness of the pattern layer by manufacturing the pattern layer by laminating it using powder, particularly by a low-temperature spraying method.

[0066] The metal pattern layer (30) may include one or more of the metal patterns (31), specifically a plurality of the metal patterns (31).

[0067] The metal patterns (31) may have the same size as each other, but are not limited thereto.

[0068] The metal pattern (31) may include one or more shapes selected from the group in which the horizontal cross-section is circular and polygonal, but is not limited thereto.

[0069] Specifically, the metal pattern (31) may have a horizontal cross-section that is square.

[0070] More specifically, the metal pattern (31) can be formed to have a constant width in a straight line.

[0071] A plurality of the metal patterns (31) can be formed such that adjacent metal patterns (31) have a constant spacing from each other.

[0073] The metal pattern layer (30) may include the shape of one or more patterns selected from a group consisting of straight lines, zigzag patterns, sine curves, and closed curves arranged in a continuous sequence.

[0074] When the above pattern is connected by a single straight line, the connected line may be a straight line or a curve, may have a regular or irregular shape, and the interior of the connected lines (closed curve portions) may take the form of an island, but is not limited thereto.

[0076] In another embodiment of the present invention, the metal pattern layer (30) may include a stripe pattern.

[0077] In short, the metal pattern layer (30) according to the present invention may include a stripe pattern formed to have a constant width in a straight line and a constant spacing.

[0079] The metal pattern (31) may have a width of 0.5 mm to 30 mm, preferably 1 mm to 10 mm, more preferably 2 mm to 5 mm.

[0080] If the width of the metal pattern satisfies the above range, it is desirable to be able to provide a high bonding force between the metal pattern layer (30) and the metal plate (20).

[0082] The distance between the metal pattern (31) and the adjacent metal pattern (31) may be 5 mm to 100 mm, preferably 10 mm to 50 mm, more preferably 20 mm to 30 mm.

[0083] If the distance between adjacent metal patterns satisfies the above range, it is desirable to have the advantage of excellent mechanical properties of the clad plate (100) while minimizing the number of metal patterns included in the metal pattern layer (30).

[0084] In addition, it is desirable that it is excellent in terms of price and has excellent bonding strength of the clad plate (100).

[0086] In another embodiment of the present invention, the metal pattern layer (30) may have a thickness of 0.1 mm to 5.0 mm, preferably 0.3 mm to 3.0 mm, and more preferably 0.5 mm to 2.0 mm.

[0087] If the thickness of the metal pattern layer (30) satisfies the above range, it is desirable to obtain a clad plate (100) with excellent bonding strength while minimizing the thickness of the metal pattern layer (30).

[0089] The metal pattern layer (30) may have a portion of it diffused into the surface of the carbon steel plate (10) as in FIG. 1, but is not limited thereto.

[0091] weld

[0092] The clad plate (100) according to the present invention includes a weld (40) connecting the metal pattern layer (30) and the metal plate (20). Specifically, the weld (40) can connect the side of the metal pattern layer (30) and the side of the metal plate (20). FIG. 2 illustrates a weld (40) connecting the side of the metal pattern layer (30) and the side of the metal plate (20).

[0093] The above welded portion (40) can be formed by overlapping welding the metal pattern layer (30) and the metal plate (20).

[0094] The above weldment (40) may be formed using a filler material, but is not limited thereto. However, if the above weldment is formed using a filler material, it is preferable that it be formed using a filler material containing titanium.

[0095] It is preferable that the above filler material contains titanium, as this results in better bonding strength with the metal plate (20).

[0097] In another embodiment of the present invention, the weld (40) may not come into contact with the carbon steel plate (10). Specifically, the weld (40) may not come into contact with the side of the carbon steel plate (10).

[0098] Since the weld (40) does not come into contact with the carbon steel plate (10), the metal pattern layer (30) and the carbon steel plate (10) are melted, and the formation of an intermetallic compound layer between the carbon steel plate (10) and the metal pattern layer (30) is minimized, which has the advantage of creating a sound weld (40).

[0100] The clad plate (100) according to the present invention has the advantage of minimizing the formation of an intermetallic compound layer at the interface between the metal pattern layer (30) and the carbon steel plate (10), thereby minimizing the formation of holes that act as defects.

[0102] In another embodiment of the present invention, the metal pattern layer (30) may have a relative density of 90% or more, specifically 93% or more, and more specifically 95% or more.

[0103] "Relative density" can be calculated from the formula: Relative density = Measured density / Theoretical density × 100 (%). Here, the measured density is the value obtained by dividing weight by volume, and the volume can be measured by the Archimedes method. The theoretical density of a metal is calculated using the number of atoms per unit cell (n), atomic weight (A), and Avogadro's number (N). A ), unit cell volume (V C Equation using ) ρ = nA / (N A × V C It is calculated as ). In the case of alloys, the average atomic weight calculated using the composition ratio of each element as a weight is applied.

[0104] If the relative density of the metal pattern layer (30) satisfies the above range, it may mean that the creation of holes acting as defects in the metal pattern layer (30) is minimized, and as a result, it is desirable to be able to provide a high bonding strength between the metal pattern layer (30) and the metal plate (20).

[0106] The clad plate (100) according to the present invention has excellent bonding quality and has the advantage of excellent mechanical properties as no intermetallic compounds are included between the carbon steel plate (10) and the metal plate (20).

[0108] Method for manufacturing clad plates

[0109] Another aspect of the present invention relates to a method for manufacturing a clad plate (100), comprising the steps of: forming a metal pattern layer (30) having one or more metal patterns (31) by spraying metal powder at low temperature onto at least one surface of a carbon steel plate (10); placing a metal plate (20) on top of the carbon steel plate (10) on which the metal pattern layer (30) is formed; and overlapping welding the metal pattern layer (30) and the metal plate (20).

[0110] The method for manufacturing a clad plate (100) according to the present invention has the advantage of being able to manufacture a structure by cladding a carbon steel plate (10) and a metal plate (20) relatively simply and at low cost.

[0111] In addition, there is an advantage in being able to manufacture a titanium cladding plate with excellent bonding strength and excellent mechanical properties by suppressing the phenomenon of intermetallic compounds being formed between the carbon steel plate (10) and the metal plate (20).

[0112] The above carbon steel plate (10), metal plate (20), and metal pattern layer (30) may be subject to the aforementioned details.

[0113] In another embodiment of the present invention, the metal plate (20) may comprise one or more selected from the group consisting of titanium, titanium alloy, zirconium, zirconium alloy, tantalum and tantalum alloy.

[0114] In another embodiment of the present invention, the metal plate (20) may be a titanium plate.

[0115] In short, the method for manufacturing a clad plate (100) according to the present invention may be a method for manufacturing a titanium clad plate.

[0117] Step of forming a metal pattern layer

[0118] A method for manufacturing a clad plate (100) according to the present invention includes the step of forming a metal pattern layer (30) comprising one or more metal patterns (31) by spraying metal powder at low temperature onto at least one surface of a carbon steel plate (10).

[0119] The above-mentioned low-temperature spraying is a representative method among solid-state additive manufacturing processes.

[0121] When metal plates (20), such as titanium plates and carbon steel plates, are welded directly at high temperatures without using an intermediate insert, the reactivity of titanium is high, so a brittle intermetallic compound such as FeTi, Fe2Ti, or Fe2Ti4O is formed in the reaction region of the interface between the titanium plates and the carbon steel plates, which causes a problem in that the quality of the weld is degraded.

[0122] Therefore, to improve the joining quality, another plate (thin plate) or strip is sometimes used as an intermediate insert between the titanium plate and the carbon steel plate to perform deep resistance welding.

[0123] However, in such cases, a process of tack welding is required by fixing an intermediate insert to the desired position on the base material, and since resistance seam welding requires a rotating electrode to be installed on the upper and lower parts of the material to apply a load of a certain size, there is a problem that the equipment cost is high due to the inclusion of mechanical structures.

[0125] Accordingly, in the present invention, metal powder is sprayed at low temperature onto at least one surface of a carbon steel plate (10) to form a metal pattern layer (30) comprising one or more metal patterns (31).

[0126] Since the above low-temperature spraying process is a solid-state process, an intermetallic compound layer is not formed at the interface between the sprayed metal powder and the carbon steel, and there is an advantage that materials such as copper or titanium, which are particularly prone to oxidation, can be easily coated even in the atmosphere rather than in a vacuum or inert atmosphere.

[0128] The above low-temperature spraying device is not limited in the present invention. For example, a low-temperature spraying gun may be positioned on one side of the carbon steel plate (10) or on the front and back sides of the plate, and metal powder to be coated may be sprayed to create a two- or three-type coating.

[0129] In addition, the number of metal pattern layers (30) can be adjusted by connecting two or more of the above-mentioned low-temperature spray guns in front, or one side can be coated with two different materials, but is not limited thereto.

[0131] In another embodiment of the present invention, the metal powder may be spherical or angular powder, and the diameter of the particles may be 1 to 200 μm, preferably 5 to 100 μm, more preferably 10 to 50 μm.

[0132] The above "diameter" may refer to the longest line segment passing through the center point when a line segment is drawn on the shape of the metal powder. For example, if the hole is spherical, the diameter may be the diameter of the metal powder.

[0133] When using the above-mentioned square powder, the interlocking is good, so the physical properties of the metal pattern layer (30) formed can be improved, and when using the above-mentioned spherical powder, the phenomenon of irregular holes being generated can be suppressed.

[0134] When the diameter of the particles of the metal powder satisfies the above range, the particle size is appropriate, so there is an advantage in that a sufficient amount is sprayed directly onto the carbon steel surface and a metal pattern layer (30) with excellent adhesion can be formed.

[0135] The above metal powder can be collected and reused after coating, thereby reducing production costs.

[0137] The above metal powder may include one or more metals selected from the group consisting of, for example, titanium, titanium alloy, zirconium, zirconium alloy, tantalum, tantalum alloy, copper, nickel, and silver.

[0138] Preferably, the metal powder can be made of the same material as the metal plate (20).

[0139] Specifically, the metal powder may be titanium. In short, the metal plate (20) may be a titanium plate, and the metal powder may be titanium.

[0141] In another embodiment of the present invention, the low-temperature spraying may involve spraying the metal powder at high speed from a spraying device filled with compressed gas.

[0142] Although it is not intended to be limited by theory, generally, if the above metal powder is accelerated by a supersonic jet using He, N2, air, or a mixture of these compressed gases, it reaches a speed (300 to 1300 m / sec) sufficient to cause plastic deformation and bonding of the material, and is coated.

[0143] High-speed collisions can destroy the thin metal oxide film of the metal powder and instantaneously form interatomic bonds under high pressure and temperature. At this time, heating the temperature of the compressed gas can increase the adhesion rate of the collision particles, and since this allows coating in a solid state without melting the metal powder at high temperatures, it offers many advantages that overcome the disadvantages of conventional thermal spray coating.

[0144] Referring to FIG. 1, when titanium powder is deposited (coated) on the surface of the carbon steel plate (10) by low-temperature spraying, the titanium powder penetrates the surface of the carbon steel plate (10) finely, destroying the oxide film on the surface of the carbon steel plate (10), and the titanium atoms diffuse into the interior of the carbon steel plate (10), thereby forming atomic bonds.

[0145] At this time, the lamination (coating) efficiency is about 90%, but there is an advantage that no intermetallic compound such as TI-Fe is formed at the interface between the carbon steel plate (10) and the metal plate (20), specifically between the carbon steel plate (10) and the titanium plate (20).

[0147] The above low-temperature spraying process can form a metal pattern (31) containing the metal powder at a temperature below the melting point of the metal powder.

[0148] In short, in the present invention, the “low-temperature spraying process” may refer to a process of spraying the metal powder at a temperature below the melting point of the metal powder.

[0149] In another embodiment of the present invention, when the metal powder is sprayed at high speed from a spray device filled with compressed gas, the temperature of the compressed gas may be 300 to 800°C, preferably 400 to 700°C, more preferably 550 to 650°C.

[0150] When the temperature of the compressed gas satisfies the above range, it is desirable to increase the adhesion rate of the metal powder with minimal energy without the metal powder melting.

[0152] When the metal powder is sprayed at high speed from the spray device filled with the compressed gas, the spray speed may be 300 to 1300 m / sec, preferably 400 to 1200 m / sec, more preferably 500 to 1000 m / sec, but is not limited thereto.

[0153] When the above injection speed satisfies the above range, it is desirable because it facilitates the formation of a metal pattern of the desired shape and suppresses the phenomenon of the metal powder being deposited in the surrounding area other than the metal pattern to be formed. In addition, it is desirable because it suppresses the phenomenon of deformation occurring on the surface of the carbon steel due to excessively strong injection pressure.

[0155] The above low-temperature spraying may be performed one or more times, but is not limited thereto.

[0156] For example, as shown in FIG. 4, a metal pattern (31) having a constant width in a straight line can be coated on the surface of the carbon steel plate (10), and then a metal pattern (31) having a constant width in a straight line can be repeatedly coated to form a metal pattern layer (30) having the shape of a stripe pattern on the carbon steel plate (10), but is not limited thereto.

[0158] The method may further include, but is not limited to, a step of pre-treating the carbon steel plate (10) prior to the step of forming the metal pattern layer (30).

[0159] For example, the carbon steel plate (10) may be preheated, brazed, and pickled, but is not limited thereto.

[0161] Step of placing metal plates

[0162] The method for manufacturing a clad plate (100) according to the present invention includes the step of placing a metal plate (20) on top of the carbon steel plate (10) on which the metal pattern layer (30) is formed.

[0163] At this time, it is preferable that the metal plate (20) has a length and width similar to that of the carbon steel plate (10).

[0164] The metal plate (20) may be pre-treated like the carbon steel plate (10), but is not limited thereto.

[0166] In another embodiment of the present invention, the method may further include the step of placing the metal plate (20); and subsequently, the step of pressing the metal plate (20).

[0167] If the step of applying pressure to the metal plate (20) is further included, it is preferable to suppress the phenomenon in which a void is formed between the metal pattern layer (30) and the metal plate (20) due to thermal deformation caused by welding described later.

[0168] The step of pressing the metal plate (20) can be performed by applying an appropriate physical force.

[0170] Overlap welding step

[0171] The method for manufacturing a clad plate (100) according to the present invention includes the step of overlapping welding the metal pattern layer (30) and the metal plate (20).

[0172] The above overlap welding may be performed by overlapping welding between the metal plate (20) and the metal pattern layer (30) using a laser heat source or an arc heat source, etc.

[0173] At this time, the molten pool of the weld (40) is performed so that it does not descend to the surface between the metal pattern layer (30) and the carbon steel pattern, that is, to the interface between the metal pattern layer (30) and the carbon steel pattern.

[0174] If the molten pool descends to the interface between the metal pattern layer (30) and the carbon steel plate (10), the metal of the metal pattern layer (30) and the carbon steel react to form a thick intermetallic compound, which may cause the joint to easily detach.

[0176] The above overlap welding may be performed using a filler material containing titanium, but is not limited thereto.

[0177] In addition, the conditions for the overlap welding in the present invention are not limited. For example, it can be performed by appropriately adjusting the size of the heat source so that the molten pool does not come into contact with the interface between the metal pattern layer (30) and the carbon steel plate (10), thereby creating a weld bead as shown in FIG. 2.

[0179] Due to the heat source generated during the overlap welding of the metal pattern layer (30) and the metal plate (20), a thin layer containing an intermetallic compound in which Ti and Fe are bonded by mutual diffusion can be formed on the surface of the metal pattern layer (30) and the carbon steel plate (10), and as a result, superior bonding strength can be obtained compared to when only low-temperature spraying is performed.

[0180] In addition, the metal pattern layer (30) produced through the low-temperature spraying process may contain holes, and generally, a separate heat treatment process must be performed to remove the holes. However, the method for manufacturing the clad plate (100) according to the present invention has the advantage of being able to remove the holes without performing a separate heat treatment process due to the heat source generated during the overlap welding of the metal pattern layer (30) and the metal plate (20).

[0182] The method for manufacturing a clad plate (100) according to the present invention comprises the steps of: forming a metal pattern layer (30) including one or more metal patterns (31) by spraying metal powder at low temperature onto at least one surface of a carbon steel plate (10); placing a metal plate (20) on top of the carbon steel plate (10) on which the metal pattern layer (30) is formed; and overlapping welding the metal pattern layer (30) and the metal plate (20). As such, the phenomenon of intermetallic compound formation between the carbon steel plate (10) and the metal plate (20) is suppressed, thereby providing the advantage of being able to manufacture a clad plate (100) with excellent bonding strength at a relatively low cost.

[0183] Therefore, the clad plate (100) manufactured according to the present invention can be usefully applied in various industrial fields.

[0184] FIG. 5 is an example of a case in which a cylindrical pipe-shaped structure is manufactured using a titanium clad plate (100) manufactured according to some embodiments of the present invention.

[0186] Preferred embodiments and comparative examples of the present invention are described below. However, the following examples are merely preferred embodiments of the present invention, and the present invention is not limited to the following examples.

[0188] Examples

[0189] A carbon steel plate (SS400) of 100 mm × 200 mm (thickness: 5 mm) was prepared, and titanium powder with an average particle diameter of 40 μm was sprayed at low temperature onto it to form a stripe-shaped titanium pattern layer (metal pattern layer) with a thickness of 1 mm.

[0190] At this time, the low-temperature spraying was performed by heating compressed helium gas to 600°C and spraying it at a speed of 850 m / sec to produce a titanium pattern layer.

[0191] After that, a pure titanium plate measuring 100mm × 200mm (thickness: 3mm) was placed on a carbon steel plate on which a titanium pattern layer had been formed, and fixed by applying appropriate force.

[0192] Subsequently, a laser heat source was irradiated onto the surface of the titanium plate on top of the titanium pattern layer to melt the titanium plate and the titanium pattern layer and create a weld, but the titanium clad plate was manufactured by overlapping welding so that the molten pool did not come into contact with the interface between the titanium pattern layer and the carbon steel plate.

[0194] Experimental Example

[0195] The side of the titanium clad plate manufactured according to the example and the side to be laser welded were observed using an Optical Microscope (OM), and the results are shown in Figures 3a and 3b, respectively.

[0196] Referring to Fig. 3, Fig. 3a shows the interface formed between the carbon steel plate and the metal pattern layer after only low-temperature spraying before laser welding. It can be seen that there are defects such as holes at the interface between the metal pattern layer and the carbon steel plate. However, in the case of the titanium clad plate manufactured after laser welding, it can be seen that the defects at the interface between the metal pattern layer and the carbon steel plate have been significantly reduced.

[0198] The present invention is not limited to the above embodiments and can be manufactured in various different forms, and those skilled in the art will understand that the invention can be implemented in other specific forms without changing the technical concept or essential features of the invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0200] 10: Carbon steel sheet 20: Metal sheet 30: Metal pattern layer 31: Metal pattern 40: Welded part 100: Clad board

Claims

Claim 1 A clad plate comprising: a carbon steel plate; a metal plate; a metal pattern layer including one or more metal patterns located between the carbon steel plate and the metal plate; and a weld connecting the metal pattern layer and the metal plate; wherein the weld does not come into contact with the carbon steel plate. Claim 2 delete Claim 3 In claim 1, the clad plate having a metal pattern layer with a thickness of 0.1 mm to 5.0 mm. Claim 4 A clad plate according to claim 1, wherein the metal pattern layer comprises one or more metals selected from the group consisting of titanium, titanium alloy, zirconium, zirconium alloy, tantalum, tantalum alloy, copper, nickel, and silver. Claim 5 A clad plate according to claim 1, wherein the metal pattern layer includes a stripe pattern. Claim 6 In claim 1, the metal pattern layer is a clad plate having a relative density of 90% or more. Claim 7 In claim 1, the metal plate comprises one or more selected from the group consisting of titanium, titanium alloy, zirconium, zirconium alloy, tantalum, and tantalum alloy. Claim 8 In paragraph 7, the metal plate is a clad plate that is a titanium plate. Claim 9 A method for manufacturing a clad plate, comprising: a step of forming a metal pattern layer including one or more metal patterns by low-temperature spraying metal powder onto at least one surface of a carbon steel plate; a step of placing a metal plate on top of the carbon steel plate on which the metal pattern layer is formed; and a step of overlap welding the metal pattern layer and the metal plate; wherein the overlap welding step is performed such that the molten pool of the weld does not come into contact with the interface between the metal pattern layer and the carbon steel plate. Claim 10 A method for manufacturing a clad plate according to claim 9, wherein the metal powder has a particle diameter of 1 to 200 μm. Claim 11 A method for manufacturing a clad plate according to claim 9, wherein the low-temperature spraying is the high-speed spraying of the metal powder from a spraying device filled with compressed gas. Claim 12 A method for manufacturing a clad plate according to claim 11, wherein when the metal powder is sprayed at high speed from a spray device filled with the compressed gas, the temperature of the compressed gas is 300 to 800°C. Claim 13 A method for manufacturing a clad plate according to claim 9, further comprising the step of placing the metal plate; and subsequently, the step of pressing the metal plate. Claim 14 A method for manufacturing a clad plate according to claim 9, wherein the metal plate comprises one or more selected from the group consisting of titanium, titanium alloy, zirconium, zirconium alloy, tantalum, and tantalum alloy. Claim 15 A method for manufacturing a clad plate according to claim 14, wherein the metal plate is a titanium plate.

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