A groove type additive titanium filler plate titanium clad plate welding structure

Abstract

The utility model discloses a groove type additive titanium filler plate's titanium composite board welding structure, this structure includes by first base layer steel sheet, second base layer steel sheet through first weld joint and become the welding base plate, is equipped with the titanium filler plate of integral forming using additive manufacturing mode above the welding base plate, and the titanium filler plate both sides are connected first cladding titanium plate, second cladding titanium plate through second weld joint, third weld joint, be equipped with a plurality of grooves on the upper surface of welding base plate, both sides of first weld joint, the utility model discloses the combination of " groove structure " with " additive manufacturing " has discarded traditional titanium cover plate, utilizes the melting depth deepening and mechanical occlusion effect of groove generation, has strengthened the combination intensity between titanium filler plate and steel base plate significantly, has improved brittle intermetallic compound's distribution effectively, simultaneously, this structure has reduced the weld joint number, has simplified technological process, is especially applicable to the chemical pressure vessel equipment of high requirement to corrosion resistance and strength.

Description

Technical Field

[0001] This utility model relates to the field of metal material welding technology, specifically to a titanium composite plate welding structure with a groove-shaped additive titanium filler plate. Background Technology

[0002] Pressure vessels are crucial transportation and storage equipment in the chemical industry. Their internal media are often highly corrosive gases or liquids, and they frequently face harsh environments such as high temperature, high pressure, and vacuum. Therefore, the chemical industry continuously increases its requirements for the corrosion resistance and service life of such equipment. Titanium composite plates, with their corrosion-resistant titanium cladding and high-strength steel base, not only enhance the corrosion resistance of the equipment but also retain the structural strength advantages of steel, while significantly reducing the manufacturing cost of all-titanium equipment, leading to their widespread application.

[0003] However, titanium composite plates have very poor weldability. The core problem lies in the fact that titanium and steel are dissimilar materials with significantly different physicochemical properties. During the welding process, the mixing of titanium and iron elements generates brittle intermetallic compounds such as TiFe and TiFe2. These compounds concentrate in the titanium-steel fusion zone, not only affecting the appearance of the weld but also drastically reducing the bonding strength and toughness of the weld joint, becoming a potential hazard to the safe operation of equipment.

[0004] To address the aforementioned problems, existing technologies typically employ the following approach: Before welding, a bevel is pre-machined on the base steel plate, and a groove is pre-reserved on the cladding titanium plate. Then, the base steel plate is welded using multi-layer, multi-pass arc welding. After the base weld is completed, a titanium cover plate is installed within the pre-reserved groove, and finally, the titanium cover plate is welded to the cladding titanium plates on both sides. This approach, by introducing the titanium cover plate, avoids direct fusion between the cladding titanium plate and the base steel plate, thus suppressing the formation of brittle compounds to a certain extent.

[0005] However, the existing solutions still have the following obvious shortcomings: 1. Insufficient bonding strength: The titanium cover plate is in direct contact with the weld of the completed base steel plate below. At the interface, the mutual diffusion of titanium and iron elements cannot be completely avoided, and brittle intermetallic compounds will still be generated. This results in low bonding strength between the titanium cover plate and the base layer, making it a weak link in the structure.

[0006] 2. The welding process is cumbersome and involves numerous welds: This structure requires welding the base layer first, then assembling the titanium cover plate, and finally welding the titanium cover plate to the cladding, increasing the assembly and welding steps. Furthermore, the introduction of the titanium cover plate adds two extra welds (the welds between the titanium cover plate and the titanium cladding plates on both sides), not only increasing the workload but also introducing more potential defects.

[0007] Therefore, this utility model designs a titanium composite plate welding structure with a groove-shaped additive titanium filler plate to solve the above problems.

[0008] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0009] To overcome the shortcomings of the prior art, the purpose of this utility model is to provide a welded structure of titanium composite plate with a groove-shaped additive titanium filler plate.

[0010] To achieve the above and other related objectives, the technical solution provided by this utility model is: a titanium composite plate welding structure of a grooved additive titanium filler plate, including a welding substrate, wherein the welding substrate includes a first base steel plate and a second base steel plate arranged symmetrically on the left and right, the first base steel plate and the second base steel plate are fixedly connected by welding and a first weld is formed between them; A titanium filler plate is provided at the upper center of the welding substrate. The first clad titanium plate and the second clad titanium plate are fixed to the left and right sides of the titanium filler plate by welding. The titanium filler plate forms a second weld and a third weld with the first clad titanium plate and the second clad titanium plate, respectively. The welding substrate has a groove on its upper surface, and the groove is located on both sides of the first weld.

[0011] This solution fundamentally changes the morphology of the titanium-steel interface by combining trenching with additive manufacturing. It significantly improves the bonding strength by utilizing mechanical interlocking and optimized metallurgical bonding, while simplifying the structure and reducing the number of welds.

[0012] Furthermore, both the first and second base steel plates have a bevel on their opposite sides, and the first weld fills the bevel. This design ensures the penetration depth and connection strength of the base steel plate welds, providing a stable base support for the overall structure.

[0013] Furthermore, the titanium filler plate has an up-bevel on both its left and right sides, and the second and third welds respectively fill the corresponding up-bevels. This design ensures the welding quality between the titanium filler plate and the cladding titanium plate, achieves a reliable connection of the cladding material, and ensures the continuity of the corrosion-resistant layer.

[0014] Furthermore, the number of grooves on both sides of the first weld is equal and greater than or equal to three, and the spacing between each groove on one side is equal. This solution, through the design of multiple grooves with equal spacing, makes the stress distribution at the bonding interface more uniform, further optimizing and stabilizing the bonding strength between the titanium filler plate and the substrate.

[0015] Furthermore, the titanium filler plate is fixedly connected to the welding substrate using additive manufacturing. This solution employs additive manufacturing technology, specifically laser or electron beam melting forming, which is highly suitable for the precision forming of titanium alloys and can achieve a high-quality bond with the steel substrate.

[0016] Furthermore, the groove is either a U-shaped groove or a trapezoidal groove. Both groove shapes provided in this solution can effectively enhance the mechanical interlocking effect and facilitate the additive manufacturing process.

[0017] Furthermore, the bottom of the U-shaped groove is a large arc, and the sidewalls have a slope of 5° to 15°. The slope facilitates demolding and reduces stress, while the arc transition avoids stress concentration at sharp corners, ensuring the quality of the molded part and the stability of the bonding interface.

[0018] Furthermore, the bottom of the trapezoidal groove is flat with large rounded corners, and the sidewalls have a slope of 5° to 15°. The slope facilitates demolding and reduces stress, while the rounded corner transition avoids stress concentration at sharp corners, ensuring the quality of the molded part and the stability of the bonding interface.

[0019] Furthermore, the left end of the first coated titanium plate is flush with the left end of the welding substrate, and the right end of the second coated titanium plate is flush with the right end of the welding substrate. This design ensures neat edges on the overall structure, facilitates assembly and connection with other components, and results in a tidy appearance.

[0020] Furthermore, the height of the bevel is H1, and the height of the welding substrate is H2. The relationship between H1 and H2 satisfies the condition: 0.5*H2 < H1 < 0.7*H2. This solution limits the depth range of the bevel, ensuring sufficient deposited metal to achieve a robust base layer weld while maintaining the strength of the substrate.

[0021] Furthermore, the height of the upper bevel is h1, and the height of the titanium filler plate is h2. The relationship between h1 and h2 satisfies the condition: 0.3*h2 < h1 < 0.6*h2. This scheme limits the depth range of the upper bevel to ensure that the cladding weld can fully penetrate without excessively weakening the structural integrity of the titanium filler plate.

[0022] Furthermore, the depth of the trench is D, and D satisfies 3mm≤D≤10mm. This solution limits the reasonable depth range of the trench. If it is too shallow, the effect of improving the bonding strength will not be obvious; if it is too deep, it may affect the strength of the substrate and increase the manufacturing cost. The range limited by this solution can effectively balance the bonding strength and structural reliability.

[0023] Due to the application of the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows: 1. This utility model abandons the traditional prefabricated titanium cover plate and innovatively uses additive manufacturing to integrally form a titanium filler plate on the surface of a pre-set groove in the base steel plate. This process utilizes the "deepening effect" achieved through the groove, allowing the molten titanium alloy to penetrate deep into the groove during additive manufacturing and form a strong mechanical and metallurgical bond with the base steel plate. Simultaneously, this structure alters the distribution of brittle intermetallic compounds, preventing them from continuously agglomerating on a flat interface. Instead, they are segmented and dispersed within the complex three-dimensional interface of the groove, thereby significantly improving the joint strength and toughness between the titanium filler plate and the welding substrate.

[0024] 2. This invention reduces the number of welds and simplifies the process: Because the titanium filler plate is directly bonded to the substrate through additive manufacturing, the weld between the titanium cover plate and the base layer in the traditional structure is eliminated. The entire structure only contains a first weld (connecting the two base steel plates), a second weld, and a third weld (connecting the titanium filler plate and the two cladding titanium plates), reducing the number of welds and making the structure more compact. Consequently, assembly and welding processes are simplified, improving production efficiency and reducing manufacturing costs and potential defect rates. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the welded structure of the titanium composite plate of this utility model; Figure 2 This is a schematic diagram illustrating the welding structure parameters of the titanium composite plate of this utility model; In the above figures, 1 is the welding base plate; 101 is the first base steel plate; 102 is the second base steel plate; 2 is the titanium filler plate; 3 is the first cladding titanium plate; 4 is the second cladding titanium plate; 5 is the first weld; 6 is the second weld; 7 is the third weld; 8 is the trench; 9 is the lower bevel; and 10 is the upper bevel. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0027] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0031] Example 1: See appendix Figure 1 and attached Figure 2 As shown, this embodiment provides a titanium composite plate welding structure of a groove-shaped additive titanium filler plate, which mainly consists of a lower welding substrate 1 and an upper titanium cladding layer.

[0032] The welding substrate 1 is composed of a first base steel plate 101 and a second base steel plate 102 arranged symmetrically side by side. Both have a bevel 9 machined on opposite sides. They are connected by welding (e.g., arc welding), forming a weld that fills the bevel 9 and the gaps between them, constituting the first weld 5. On the upper surface of the welding substrate 1, on both sides of the first weld 5, a series of U-shaped grooves 8 are pre-machined. In this embodiment, three U-shaped grooves 8 are provided on each side, with equal spacing. The bottom of the U-shaped grooves 8 adopts a large arc transition, and the sidewalls have a 10° slope. This design facilitates the flow and forming of the molten metal during subsequent additive manufacturing, reduces stress concentration, and ensures quality stability. The depth D of the grooves 8 is designed to be 6mm to ensure sufficient bonding strength.

[0033] After preparing the welding substrate 1 with grooves 8, a selective laser melting (SLM) additive manufacturing method is used to melt titanium alloy powder layer by layer on the surface of the substrate, including the area containing the first weld 5 and the grooves 8, and integrally print out the titanium filler plate 2. During this process, the molten titanium alloy and the base steel plate form a strong mechanical interlocking and micro-metallurgical bond inside the grooves 8.

[0034] Subsequently, a first clad titanium plate 3 and a second clad titanium plate 4 are assembled on the left and right sides of the titanium filler plate 2. The titanium filler plate 2 has beveled edges 10 machined on both sides. The first clad titanium plate 3 and the second clad titanium plate 4 are welded to the titanium filler plate 2 by welding (such as TIG welding), forming a second weld 6 and a third weld 7 that fill the beveled edges 10 and the joint space. The left end of the first clad titanium plate 3 is vertically aligned with the left end of the welding substrate 1, and the right end of the second clad titanium plate 4 is vertically aligned with the right end of the welding substrate 1, making the overall structure regular.

[0035] In this embodiment, the height H2 of the welding substrate 1 is 30mm, and the height H1 of the lower bevel 9 is designed to be 16mm, satisfying 0.5*H2.

[0036] Example 2: The difference between this embodiment and Embodiment 1 is that the groove 8 is a trapezoidal groove. The bottom of the trapezoidal groove is a flat bottom with large rounded corners, and the sidewalls have an 8° slope. This shape also has good forming stability. The titanium filler plate 2 is prepared by additive manufacturing using electron beam melting (EBM). The depth D of the groove 8 is 8 mm. The height H2 of the welding substrate 1 is 40 mm, and the height H1 of the lower bevel 9 is 25 mm. Other structures and connections are the same as in Embodiment 1.

[0037] ​Operating instructions: The welding structure operation method of this utility model is as follows: 1. Pre-treatment: Prepare the first base steel plate 101 and the second base steel plate 102, and machine the bevel 9 at their mating edges. On the upper surface of the welding substrate 1 after the two are assembled, on both sides of the predetermined first weld 5, machine grooves 8 of a specified shape (U-shaped or trapezoidal) and number.

[0038] 2. Welding the base layer: Weld the first base layer steel plate 101 and the second base layer steel plate 102 to form the first weld 5 that fills the lower bevel 9.

[0039] 3. Additive Manufacturing of Titanium Filler Plate: The surface of the welded substrate 1 with the first weld seam 5 and the groove 8 is cleaned. Then, it is placed in an additive manufacturing device, and using a laser or electron beam as a heat source, titanium alloy powder is selectively melted on the substrate surface according to a preset three-dimensional model path, and deposited layer by layer to integrally form the titanium filler plate 2. The molten metal of the titanium filler plate 2 forms a firm bond with the substrate in the groove 8.

[0040] 4. Assembly and Welding of the Coating: The first clad titanium plate 3 and the second clad titanium plate 4 are respectively assembled on the left and right sides of the titanium filler plate 2. The upper bevel 10 between the titanium filler plate 2 and the first clad titanium plate 3 and the second clad titanium plate 4 is welded to form the second weld 6 and the third weld 7.

[0041] 5. Post-processing: Perform necessary cleaning and inspection on the completed welded joints.

[0042] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A welded structure of a titanium composite plate with a grooved additive titanium filler plate, characterized in that: The welding substrate (1) includes a first base steel plate (101) and a second base steel plate (102) arranged symmetrically on the left and right sides. The first base steel plate (101) and the second base steel plate (102) are fixedly connected by welding and a first weld (5) is formed between them. A titanium filler plate (2) is provided in the upper middle part of the welding substrate (1). The first clad titanium plate (3) and the second clad titanium plate (4) are fixed on the left and right sides of the titanium filler plate (2) by welding. A second weld (6) and a third weld (7) are formed between the titanium filler plate (2) and the first clad titanium plate (3) and the second clad titanium plate (4). A groove (8) is provided on the upper part of the welding substrate (1), and the groove (8) is located on both sides of the first weld (5).

2. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 1, characterized in that: The first base plate (101) and the second base plate (102) are provided with a lower bevel (9) on their opposite sides, and the first weld (5) is provided with the lower bevel (9).

3. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 1, characterized in that: The titanium filler plate (2) has an upper bevel (10) on both the left and right sides, and the second weld (6) and the third weld (7) are respectively filled with the corresponding upper bevel (10).

4. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 1, characterized in that: The number of grooves (8) on both sides of the first weld (5) is equal and greater than or equal to three, and the spacing between each groove (8) on one side is equal.

5. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 1, characterized in that: The titanium filler plate (2) is fixedly connected to the welding substrate (1) by means of additive manufacturing.

6. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 1, characterized in that: The groove (8) is a U-shaped groove (8) or a trapezoidal groove (8).

7. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 1, characterized in that: The left end of the first coated titanium plate (3) is flush with the left end of the welding substrate (1), and the right end of the second coated titanium plate (4) is flush with the right end of the welding substrate (1).

8. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 2, characterized in that: The height of the lower bevel (9) is H1, and the height of the welding substrate (1) is H2. The relationship between H1 and H2 satisfies the condition: 0.5*H2<H1<0.7*H2.

9. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 3, characterized in that: The height of the upper slope (10) is h1, and the height of the titanium filler plate (2) is h2. The relationship between h1 and h2 satisfies the condition: 0.3*h2<h1<0.6*h2.

10. The titanium composite plate welding structure of a grooved additive titanium filler plate according to claim 1, characterized in that: The depth of the groove (8) is D, and D satisfies 3mm≤D≤10mm.

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