Titanium tube forming and welding anti-collapse tooling

Abstract

The utility model provides a prevent welding seam collapse frock for titanium pipe forming welding, belongs to metal pipe welding equipment technical field. Including: the upper portion of welding pipe machine body is equipped with horizontal pressing disc and vertical pressing disc, the rear portion of welding pipe machine body is equipped with welding machine, still include a setting in the inside of forming titanium pipe argon delivery pipe, the one end of argon delivery pipe is located in the forming opening end of titanium pipe, and is connected with the support fixed frame fixed on welding pipe machine body through a connecting gas pipe, and the connecting gas pipe is communicated with outside argon gas source through pipeline, the other end of argon delivery pipe extends to the inside of titanium pipe at the welding machine, is equipped with a upwards gas hole in the upper tube wall of this end, and is opposite the welding torch head of welding machine, the both ends port of argon delivery pipe is closed, and the tube body outside is equipped with the sealing ring of dynamic sealing with the inner wall of titanium pipe, the utility model can be accurate to the welding seam back delivery argon when titanium pipe welding, forms a upwards gas supporting force, to offset the gravity of molten pool, prevents welding seam collapse and oxidation.

Description

Technical Field

[0001] This utility model belongs to the technical field of metal pipe welding and processing equipment, specifically relating to a tooling for preventing weld collapse in titanium pipe forming and welding. Background Technology

[0002] Titanium tubes are widely used in aerospace, chemical, and medical fields due to their excellent corrosion resistance and high strength-to-weight ratio. In the production process of titanium tubes, titanium strips are typically rolled into shape using a pipe welding machine, and their longitudinal seams are welded. Welding is usually performed using methods such as gas inert gas (TIG) welding.

[0003] However, titanium is a highly reactive metal that readily reacts with oxygen and nitrogen in the air at high temperatures, leading to weld embrittlement and performance degradation. Therefore, titanium tube welding must be carried out under effective inert gas protection (such as argon). Furthermore, during welding, the molten titanium, due to its fluid properties, is prone to sinking and flowing under gravity, causing defects such as collapse, concavity, or even burn-through on the back of the weld. This collapse not only affects the inner diameter and aesthetics of the titanium tube, but more seriously, it significantly reduces the mechanical properties of the weld, becoming a stress concentration point. During subsequent use, this point is highly susceptible to fracture, leading to product scrap or even safety accidents.

[0004] In existing technologies, a protective gas shield is typically provided outside the titanium tube, and overall argon backfilling is used inside to prevent weld oxidation. However, conventional argon backfilling methods have limited effectiveness in preventing weld collapse caused by gravity-induced molten pool slump. This is because overall argon purging primarily creates an oxygen-free environment but does not provide any upward support to the molten pool. Therefore, there is an urgent need for a device that can provide localized upward support to the weld, effectively preventing weld collapse during titanium tube welding. Utility Model Content

[0005] The technical problem solved by this utility model is to address the shortcomings of the existing technology by providing a tooling for preventing weld collapse during titanium tube forming and welding. This tooling can accurately deliver argon gas to the back of the weld during titanium tube welding and provide an upward gas support force to counteract the gravity of the molten pool and prevent weld collapse and oxidation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A fixture for preventing weld collapse during titanium tube forming and welding includes a welding machine body. The upper part of the welding machine body is equipped with a transverse pressing plate and a vertical pressing plate for rolling titanium strip into titanium tubes. The rear part of the welding machine body is equipped with a welding machine for welding the titanium tube weld seam. It also includes an argon gas delivery pipe disposed inside the formed titanium tube. One end of the argon gas delivery pipe is located at the formed opening end of the titanium tube and is connected to a support frame fixed on the welding machine body through a connecting gas pipe. The connecting gas pipe is connected to an external argon gas source through a pipeline. The other end of the argon gas delivery pipe extends into the interior of the titanium tube at the welding machine, and at least one upward-facing gas hole is provided on the upper pipe wall of this end, facing the welding torch head of the welding machine. The two ends of the argon gas delivery pipe are closed, and a sealing ring is fitted on the outside of the pipe body to form a dynamic seal with the inner wall of the titanium pipe.

[0007] Further defining the above solution, the support frame includes a vertical plate fixedly installed on the welding pipe machine body, and a horizontal bar fixed on the vertical plate, the horizontal bar being fixedly connected to the connecting air pipe.

[0008] As a further limitation of the above scheme, the connecting gas tube is connected to the argon gas source via a quick-connect fitting and a gas tube.

[0009] Further defining the above solution, the sealing ring has a multi-layer structure, consisting of alternating layers of polytetrafluoroethylene and fire-resistant fabric.

[0010] Further defining the above scheme, the number of pores is multiple, arranged axially along the argon delivery pipe.

[0011] As a further limitation of the above scheme, the argon gas delivery pipe is made of stainless steel or nickel-based alloy material.

[0012] Advantages of this utility model compared to the prior art: 1. This solution precisely counteracts gravity: This invention creates a gas hole directly above the welding point in the argon gas delivery pipe, allowing the argon gas to be concentrated and blown vertically upwards towards the back of the weld, which is in a high-temperature molten state. This upward airflow effectively counteracts the downward force of the molten pool due to its own gravity, thereby fundamentally preventing the formation of defects such as weld collapse and concavity. 2. This solution enhances the protective effect: After the argon gas is blown out from the pore, it preferentially accumulates in the back area of ​​the weld, forming a local high-concentration, high-speed renewal inert gas protective environment. This can more effectively remove air from the area, prevent the high-temperature weld metal from being oxidized and nitrided, and ensure the metallurgical quality of the weld. 3. This solution has an ingenious structure and is suitable for continuous production: the argon delivery pipe is fixed by a support frame, keeping it stationary during the moving welding process of the titanium pipe. The sealing ring forms a dynamic seal with the inner wall of the moving titanium pipe, ensuring that the gas delivery pipe cavity has a certain degree of sealing, allowing argon gas to escape effectively from the pores. At the same time, this structure does not hinder the continuous advance and welding of the titanium pipe, making it very suitable for continuous production lines of pipe welding machines. 4. This solution improves yield and safety: By effectively preventing weld collapse and oxidation, it significantly improves the forming quality, mechanical properties and finished product qualification rate of titanium tube products, eliminates the potential breakage risk caused by weld defects, and enhances the safety and reliability of the products. 5. This solution saves argon: Compared with the back argon method of filling the entire titanium tube with argon over a large area, this utility model only supplies argon to the welding point precisely, which greatly reduces the consumption of argon and lowers the production cost. Attached Figure Description

[0013] Figure 1 This is a front view of the overall structure of this utility model; Figure 2 This is a top view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the argon gas delivery pipe in this utility model; Figure 4 This utility model Figure 3 Enlarged schematic diagram of part A in the diagram; Figure 5 This is a schematic diagram of the sealing ring in this utility model.

[0014] In the diagram: 1. Welding pipe machine body; 2. Horizontal pressing plate; 3. Vertical pressing plate; 4. Welding machine; 5. Titanium pipe; 6. Argon gas delivery pipe; 7. Connecting gas pipe; 8. Quick connector; 9. Gas pipe; 10. Horizontal bar; 11. Vertical plate; 12. Air hole; 13. Sealing ring; 14. Polytetrafluoroethylene layer; 15. Fire protection cloth layer. 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] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0017] 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.

[0018] Please see Figure 1-5 The embodiments of this utility model are described in detail below.

[0019] Example: See Figure 1 , Figure 2 As shown, the fixture for preventing weld collapse during titanium tube forming and welding is mainly used on a pipe welding machine. The pipe welding machine includes a machine platform 1, with a horizontal pressing plate 2 and a vertical pressing plate 3 mounted on the upper part of the machine platform 1, used to gradually roll and extrude titanium strip into a circular titanium tube 5. A welding machine 4 for welding the titanium tube weld is located at the rear of the machine platform 1.

[0020] The improvement of this invention lies in the addition of a built-in argon gas protection and support system. This system includes a slender argon gas delivery pipe 6 disposed inside the formed titanium tube 5. The argon gas delivery pipe 6 is made of a high-temperature resistant metal material that does not react with titanium, such as stainless steel or a nickel-based alloy.

[0021] See Figure 1 , Figure 2 As shown, one end of the argon gas delivery pipe 6 is located near the open end of the titanium strip that has just been rolled into a tube but is not yet closed. This end is connected to a support frame fixed to the pipe welding machine body 1 via a connecting gas pipe 7. The support frame includes two upright plates 11 fixedly installed on the pipe welding machine body 1, and a crossbar 10 fixed to the upright plates 11. The crossbar 10 is fixedly connected to the connecting gas pipe 7. This securely suspends and fixes the entire argon gas delivery pipe 6 system in a predetermined position. (See reference...) Figure 3 As shown, the connecting tube 7 is connected to the argon gas source via quick connector 8 and tube 9 (not shown in the figure).

[0022] See Figure 1 , Figure 2 As shown, the other end of the argon gas delivery pipe 6 extends forward, penetrating deep into the titanium pipe 5 section inside the welding machine 4. One or more upward-facing vents 12 are provided on the pipe wall directly above this end. (See reference...) Figure 4 As shown, the position of the vent 12 is directly opposite the welding gun head of the welding machine 4.

[0023] Both ends of the argon gas delivery pipe 6 are sealed. A sealing ring 13 is tightly fitted onto the outside of the argon gas delivery pipe 6. In this embodiment, see [reference needed]. Figure 5 As shown, the sealing ring 13 has a multi-layer structure, consisting of an alternating layer of wear-resistant and self-lubricating polytetrafluoroethylene (PTFE) 14 and a high-temperature resistant fire-resistant fabric 15. The outer diameter of the sealing ring 13 is slightly larger than the inner diameter of the titanium tube 5, ensuring close contact between it and the inner wall of the moving titanium tube 5, thus forming an effective dynamic seal.

[0024] Working principle of this utility model: The titanium strip moves forward on the pipe welding machine, passing sequentially through the transverse pressing plate 2 and the vertical pressing plate 3, gradually curling and closing to form a titanium tube 5. The formed titanium tube 5 continues to move forward, and when it passes the welding 4, the welding torch welds its longitudinal seam.

[0025] Argon gas supplied by an external argon source enters the argon delivery pipe 6 through pipe 9, quick connector 8, and connecting pipe 7. Since both ends of the argon delivery pipe 6 are closed, the argon gas is ultimately ejected from the single pore 12 on its wall. The ejected argon gas flow directly faces the back of the weld, which is at a high welding temperature and in a molten state. This flow has two key effects: First, the upward airflow exerts an upward lifting force on the molten pool, counteracting the downward tendency of the pool due to gravity, thus preventing weld collapse. Second, the high-purity argon gas immediately surrounds and protects the high-temperature weld metal, isolating it from air and preventing oxidation. Simultaneously, as the titanium pipe 5 advances, its inner wall slides relative to the sealing ring 13 fixed to the argon delivery pipe 6. Due to the elasticity and multi-layered structure of the sealing ring 13, an effective dynamic seal is formed, preventing large-scale gas leakage.

[0026] The entire process is continuous, with a stationary argon gas delivery system working in conjunction with a moving titanium tube to achieve real-time, precise protection and support of the weld seam in continuous production.

[0027] This invention enables precise delivery of argon gas to the back of the weld during titanium tube welding, while simultaneously providing an upward gas support force to counteract the gravity of the molten pool, preventing weld collapse and oxidation. The ingenious structure improves yield, is safe and reliable, and has low processing costs.

[0028] 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.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification 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 fixture for preventing weld collapse during titanium tube forming and welding, comprising a welding machine body (1), wherein the upper part of the welding machine body (1) is provided with a transverse pressing plate (2) and a vertical pressing plate (3) for rolling titanium strip into titanium tubes (5), and the rear part of the welding machine body (1) is provided with a welding machine (4) for welding the titanium tube weld, characterized in that: It also includes an argon gas delivery pipe (6) disposed inside the formed titanium tube (5). One end of the argon gas delivery pipe (6) is located at the formed opening end of the titanium tube (5) and is connected to the support frame fixed on the welding machine body (1) through a connecting gas pipe (7). The connecting gas pipe (7) is connected to an external argon gas source through a pipeline. The other end of the argon gas delivery pipe (6) extends into the interior of the titanium tube (5) at the welding machine (4), and at least one upward-facing gas hole (12) is provided on the upper pipe wall of this end, facing the welding gun head of the welding machine (4). The two ends of the argon delivery pipe (6) are closed, and a sealing ring (13) is fitted on the outside of the pipe body to form a dynamic seal with the inner wall of the titanium pipe (5).

2. The fixture for preventing weld collapse during titanium tube forming and welding according to claim 1, characterized in that: The support frame includes a vertical plate (11) fixedly installed on the welding pipe machine body (1) and a horizontal bar (10) fixed on the vertical plate (11), the horizontal bar (10) being fixedly connected to the connecting air pipe (7).

3. The tooling for preventing weld collapse during titanium tube forming and welding according to claim 1, characterized in that: The connecting gas pipe (7) is connected to the argon gas source via a quick connector (8) and a gas pipe (9).

4. The fixture for preventing weld collapse during titanium tube forming and welding according to claim 1, characterized in that: The sealing ring (13) has a multi-layer structure, consisting of alternating layers of polytetrafluoroethylene (14) and fire-resistant fabric (15).

5. The fixture for preventing weld collapse during titanium tube forming and welding according to claim 1, characterized in that: The pores (12) are multiple and arranged axially along the argon delivery pipe (6).

6. The tooling for preventing weld collapse during titanium tube forming and welding according to claim 1, characterized in that: The argon delivery pipe (6) is made of stainless steel or nickel-based alloy.

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