Anti-weld collapse device for titanium plate butt welding

Abstract

The application provides a welding seam collapse prevention device for butt welding of titanium plates, and belongs to the technical field of welding tooling. The device comprises a backing plate, a horizontally extending main gas channel is arranged in the backing plate, one end of the main gas channel is connected with an external gas source, and the other end of the main gas channel is a closed end; a plurality of gas distribution channels are arranged on the upper surface of the backing plate, the lower ends of the gas distribution channels are in communication with the main gas channel, and the upper ends of the gas distribution channels extend to the upper surface of the backing plate; and the plurality of gas distribution channels are uniformly arranged along a straight line, and the straight line is used for corresponding to the position of the welding seam between the two titanium plates to be welded. According to the scheme, the gas channel is arranged in the backing plate directly below the welding seam, argon is introduced into the gas channel during welding, the argon flow jetted from below not only forms a reliable protective gas layer on the back of the molten pool, but also generates a continuous upward supporting force on the molten titanium liquid, the downward flowing trend of the molten pool metal due to gravity is effectively offset, and the molten pool metal forms a full, uniform and high-quality welding seam without back collapse after cooling and solidification.

Description

Technical Field

[0001] This utility model belongs to the field of welding tooling technology, specifically relating to a device for preventing weld collapse in butt welding of titanium plates. Background Technology

[0002] Titanium and titanium alloys are increasingly used in aerospace, chemical, and medical fields due to their excellent specific strength, corrosion resistance, and biocompatibility. In these applications, butt welding of titanium plates is frequently required. However, titanium has a high melting point and large heat capacity, and it readily reacts with oxygen and nitrogen in the air at high temperatures, leading to a decline in weldability.

[0003] In existing titanium plate butt welding processes, argon gas is typically introduced to the back of the weld to prevent oxidation. However, titanium has low surface tension and good molten pool fluidity in its molten state. Combined with gravity, the weld metal tends to flow downwards, causing collapse on the back of the weld and defects such as undercut on the front. This collapse not only reduces the effective load-bearing area of ​​the weld, leading to stress concentration, but also makes the collapsed area more prone to oxidation during subsequent cooling, forming a brittle layer. This severely weakens the fatigue strength and mechanical properties of the joint, and may even cause premature fracture of the structure at the weld.

[0004] Therefore, there is an urgent need for a device that can effectively prevent weld collapse during butt welding of titanium plates, so as to improve the quality and reliability of welded joints. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a device for preventing weld collapse in butt welding of titanium plates. The purpose of this utility model is to address the shortcomings of the existing technology by providing a simple and easy-to-use device for preventing weld collapse in butt welding of titanium plates.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A device for preventing weld collapse in butt welding of titanium plates includes: a backing plate; The pad has a horizontally extending main air passage inside, one end of which is connected to an external air source, and the other end of which is a closed end. The upper surface of the pad has multiple air distribution channels, the lower end of all the air distribution channels is connected to the main air channel, and the upper end of all the air distribution channels extends to the upper surface of the pad. The multiple gas distribution channels are evenly arranged along a straight line, which corresponds to the weld position between the two titanium plates to be welded.

[0007] As a further limitation of the above scheme, the pad is made of a metal material with good thermal conductivity.

[0008] As a further limitation of the above scheme, the pad is made of copper plate or aluminum alloy plate.

[0009] Further limitations of the above scheme include multiple plugs, which are detachably installed at the upper opening of the gas distribution channel that is not directly below the weld, for sealing the gas distribution channel; the plugs are copper plugs.

[0010] As a further limitation of the above scheme, one end of the main gas channel is provided with a connector, which is connected to an external argon gas source through a gas pipe.

[0011] As a further limitation of the above scheme, the air distribution channel is a circular hole and its axis is perpendicular to the upper surface of the pad.

[0012] Advantages of this utility model compared to the prior art: 1. This solution effectively prevents weld collapse: This utility model sets up a gas path in the backing plate directly below the weld. During welding, argon gas is introduced into the gas path. The gas is sprayed vertically upward from the gas distribution channel, generating an upward lifting force on the bottom of the molten pool. This lifting force cancels out the weight of the molten pool metal, thereby effectively preventing the liquid metal from flowing down and avoiding defects such as back collapse and front undercut. 2. This solution enhances the back-side protection effect: the upward-blown argon gas can form a more localized and concentrated protective gas curtain on the back of the weld, which can more effectively isolate the air, prevent the back of the weld from being oxidized at high temperatures, and improve the metallurgical quality of the weld. 3. This solution improves weld formation: By balancing gravity, the weld formation is made fuller and more uniform, significantly improving the appearance and internal quality of the weld, and increasing the effective load-bearing area and mechanical properties of the joint; 4. This solution is highly applicable and flexible: by blocking part of the gas channel, the length of the effective gas channel can be easily adjusted to adapt to the welding requirements of titanium plates of different widths, making it highly versatile; 5. This solution has a simple structure and low cost: The device has a very simple structure, mainly consisting of a gasket plate with a gas passage and some standard parts (connectors, air pipes, plugs). It has low manufacturing and maintenance costs and is easy to promote and use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 Sectional view along line AA in the middle; Figure 3 This is a top view of the structure of this utility model.

[0014] The following are labeled in the diagram: 1. Pad; 2. Main airway; 3. Branch airway; 4. Connector; 5. Air tube; 6. Blockage; 7. Titanium plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0016] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] Please see Figure 1-3 The embodiments of this utility model are described in detail below.

[0018] Example: A device for preventing weld collapse in butt welding of titanium plates includes a rectangular pad 1; preferably, the pad 1 is made of a metal material with good thermal conductivity, such as copper plate or aluminum alloy plate. This can both utilize its good thermal conductivity to cool the weld area and ensure the durability of the tooling itself.

[0019] A horizontally extending main gas channel 2 is machined inside the pad 1. One end of the main gas channel 2 is connected to a quick-connect fitting 4 via a thread, which is connected to an external argon cylinder (not shown in the figure) via a gas pipe 5. The other end of the main gas channel 2 is sealed with a screw plug (or by welding, etc.).

[0020] Multiple air distribution channels 3 are machined vertically downward on the upper surface of the pad 1. The air distribution channels 3 are preferably round holes. The lower ends of all these air distribution channels 3 are connected to the main air channel 2. The upper ends of all the air distribution channels 3 extend to the upper surface of the pad 1 to ensure that the gas is injected vertically upward.

[0021] Multiple gas distribution channels 3 are evenly arranged along a straight line, and the direction of this straight line arrangement is consistent with the direction of the butt weld of the two titanium plates 7 to be welded in the future.

[0022] It also includes multiple plugs 6 made of copper, which are detachably installed at the upper opening of the gas distribution channel 3 that is not directly below the weld, to seal the gas distribution channel 3. This design allows the tooling to be flexibly adapted to butt welding of titanium plates of different widths.

[0023] Working principle: In use, align the two titanium plates 7 to be welded and place them on the pad 1, ensuring that the butt joint (i.e., the weld seam) is precisely aligned with the center line of the row of gas distribution channels 3 on the pad 1. Depending on the width of the titanium plates 7, for gas distribution channels 3 that exceed the width of the titanium plates, use a high-temperature resistant metal plug 6 (such as a copper plug) to block their upper openings to prevent argon gas from leaking out.

[0024] Before starting welding, turn on the argon gas source. The argon gas enters the main gas channel 2 through the gas pipe 5 and the connector 4 in sequence, and then is evenly distributed to all the unblocked branch gas channels 3. Finally, it is sprayed vertically upward from the upper opening of these branch gas channels 3.

[0025] During welding, the welding torch is positioned above the two titanium plates 7 to be joined, forming a molten pool. Simultaneously, an argon gas stream ejected from below creates a reliable protective gas layer on the back of the molten pool, preventing weld oxidation. Furthermore, the gas stream exerts a continuous upward dynamic pressure (lifting force) on the molten titanium. This upward force effectively counteracts the downward flow tendency of the molten metal due to its own weight, allowing the molten metal to fill the groove evenly. After cooling and solidification, this results in a full, uniform, high-quality weld without back-side collapse.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for preventing weld collapse in butt welding of titanium plates, characterized in that: include: Pad (1); The pad (1) has a horizontally extending main air passage (2) inside. One end of the main air passage (2) is connected to an external air source, and the other end of the main air passage (2) is a closed end. The upper surface of the pad (1) has multiple air distribution channels (3), the lower end of all the air distribution channels (3) is connected to the main air channel (2), and the upper end of all the air distribution channels (3) extends to the upper surface of the pad (1). Multiple gas distribution channels (3) are evenly arranged along a straight line, which corresponds to the weld position between the two titanium plates (7) to be welded.

2. The anti-weld collapse device for butt welding of titanium plates according to claim 1, characterized in that: The pad (1) is made of a metal material with good thermal conductivity.

3. The anti-weld collapse device for butt welding of titanium plates according to claim 1, characterized in that: The pad (1) is made of copper plate or aluminum alloy plate.

4. The anti-weld collapse device for butt welding of titanium plates according to claim 1, characterized in that: It also includes multiple plugs (6), which are detachably installed at the upper opening of the gas distribution channel (3) not directly below the weld, for sealing the gas distribution channel (3); the plugs (6) are made of copper.

5. The anti-weld collapse device for butt welding of titanium plates according to claim 1, characterized in that: One end of the main gas channel (2) is provided with a connector (4), which is connected to an external argon gas source through a gas pipe (5).

6. The anti-weld collapse device for butt welding of titanium plates according to claim 1, characterized in that: The air distribution channel (3) is a circular hole and its axis is perpendicular to the upper surface of the pad (1).

Images