Mounting and welding structure of rare earth wear-resistant pipeline
Through casing connection and sectional cold welding methods, the problem of difficulty in achieving eligibility of welds in rare earth wear-resistant pipeline welding is solved, the weld strength and bonding surface are enhanced, the process is simplified, the risk of crack is reduced, and the quality and performance of welds are ensured.
Patent Information
- Application Number
- CN202421879856.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-05
AI Technical Summary
The welding process of existing rare earth wear-resistant pipelines has the problem that weld connections are difficult to achieve eligibility and the probability of cracks during welding is high.
The casing connection method is adopted. The elongation of the casing is greater than that of the rare earth wear-resistant pipe. There are inner bevels on both sides of the casing, including at least two arc-shaped units. The front and rear ends of the arc-shaped units are equipped with outer bevels, and a segmented cold welding method is adopted.
It enhances the strength and bonding surface of the weld, reduces the welding stress, reduces the risk of weld cracking, simplifies the welding process, and ensures the quality and performance of the weld.
Smart Images
Figure CN223063374U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of rare earth wear-resistant steel welding, in particular to an installation welding structure of a rare earth wear-resistant pipeline. Background Technique
[0002] At present, the ash and slag removal pipelines of power station projects generally use wear-resistant high-strength steel pipes of 40CrMoMnSiRe, that is, rare earth wear-resistant pipelines. The carbon content of rare earth wear-resistant steel is relatively high, the brittleness is relatively large, and the weldability is very poor. However, the combined welding of ash removal pipelines at the construction site is inevitable. The traditional welding process of rare earth wear-resistant pipelines is to preheat to 200 °C before welding, and use multiple spot fixings to ensure uniform stress, and then use small current segmented welding, but the probability of cracks is high, and it is difficult to achieve qualified weld connections. Content of the Utility Model
[0003] The purpose of the utility model is to solve the problems existing in the prior art, and provide an installation welding structure of a rare earth wear-resistant pipeline, which has a simple structure, is easy to operate, has low requirements for the welding process itself, and can meet the weld requirements of rare earth wear-resistant pipelines.
[0004] In order to achieve the above object, the utility model is realized through the following technical solutions:
[0005] An installation welding structure of a rare earth wear-resistant pipeline includes a casing sleeved at the butt joint of the rare earth wear-resistant pipeline, and the elongation rate of the casing is greater than that of the rare earth wear-resistant pipeline. Inner bevels are provided at both the left and right ends of the casing. The casing includes at least two arc units, and outer bevels are provided at both the front and rear ends of the arc units. The arc units are welded on the rare earth wear-resistant pipeline.
[0006] Preferably, a gap of 5-10 mm is reserved for the butt joint of the rare earth wear-resistant pipeline.
[0007] Preferably, the inner bevel is a 45° inner bevel.
[0008] Preferably, the outer bevel is a 35-40° outer bevel.
[0009] Preferably, the casing includes two arc units, and the central angle of the arc unit is 180°.
[0010] Preferably, the casing is a Q235 casing.
[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0012] The utility model adopts the sleeve connection method. Since the elongation rate of the sleeve is greater than that of the rare earth wear-resistant pipeline, most of the expansion and contraction of the pipeline is borne by the sleeve. Inner bevels are adopted on both sides of the sleeve, which increases the bonding surface between the weld and the rare earth wear-resistant pipeline, enhances the weld strength, and ensures that the weld strength is greater than that of the sleeve. The structure is simple, easy to operate, and has low requirements for the welding process itself. It can ensure good joint performance and service performance, and can meet the weld requirements of the rare earth wear-resistant pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic structural diagram of the utility model;
[0014] Reference numerals in the drawings: 1, sleeve; 2, rare earth wear-resistant pipeline; 3, straight weld; 4, circumferential weld. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] The following further elaborates the utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and not to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by this application.
[0016] Embodiment: As shown in the attached Figure 1 figure, the utility model relates to an installation and welding structure of a rare earth wear-resistant pipeline, including a sleeve 1 sleeved at the butt joint of the rare earth wear-resistant pipeline 2, and the elongation rate of the sleeve 1 is greater than that of the rare earth wear-resistant pipeline 2. When selecting the sleeve 1, it should be ensured that the elongation rate of the material of the sleeve 1 is greater than that of the material of the rare earth wear-resistant pipeline 2. For example, the sleeve 1 can adopt a sleeve made of Q235 material. The elongation rate of Q235 steel is ≥26%, which is much greater than the elongation rate of 6% of the material of the rare earth wear-resistant pipeline 2. By adopting the sleeve 1 connection method, most of the expansion and contraction of the pipeline is borne by the sleeve 1.
[0017] Inner bevels are provided at both the left and right ends of the sleeve 1. The inner bevel is preferably a 45° inner bevel. The inner bevels at both the left and right ends of the sleeve 1 increase the bonding surface between the weld and the pipeline, enhance the weld strength, and ensure that the weld strength is greater than that of the sleeve 1.
[0018] The sleeve 1 includes at least two arc units, and outer bevels are provided at both the front and rear ends of the arc units. The outer bevel is preferably a 35-40° outer bevel. The sleeve 1 is preferably two arc units, and the central angle of the arc unit is 180°.
[0019] The arc unit is welded to the rare earth wear-resistant pipeline 2.
[0020] The casing 1 is in a free state during the welding process. In addition, the segmented cold welding method is used, so the welding stress is very small, reducing the tendency of the weld to crack. A 5-10 mm gap is reserved for the butt joint of the rare earth wear-resistant pipe 2 to provide space for the thermal expansion of the rare earth wear-resistant pipe 2. During operation, the gap of the rare earth wear-resistant pipe 2 will be filled with ash slag medium and will not directly rub against the casing 1.
[0021] When the present utility model is implemented, when the rare earth wear-resistant pipes 2 are butted, a 5-10 mm gap is reserved between the rare earth wear-resistant pipes 2. To accelerate the on-site installation speed, reduce the butt joint difficulty and ensure the butt joint correctness, the casing 1 is formed by two arc-shaped units. For the butt joint of the straight weld 3, a 35-40° external bevel is adopted, and for the circumferential weld 4, a 45° internal bevel is adopted to increase the bonding surface between the weld and the rare earth wear-resistant pipe 2.
Claims
1. An installation and welding structure of a rare earth wear-resistant pipeline, characterized in that: It includes a casing (1) sleeved at the butt joint of the rare earth wear-resistant pipeline (2), and the elongation rate of the casing (1) is greater than that of the rare earth wear-resistant pipeline (2). Inner bevels are provided at both the left and right ends of the casing (1). The casing (1) includes at least two arc-shaped units, and outer bevels are provided at both the front and rear ends of the arc-shaped units. The arc-shaped units are welded to the rare earth wear-resistant pipeline (2).
2. The installation and welding structure of a rare earth wear-resistant pipeline according to claim 1, characterized in that: A 5-10 mm gap is reserved for the butt joint of the rare earth wear-resistant pipeline (2).
3. The installation and welding structure of a rare earth wear-resistant pipeline as described in claim 1, characterized in that: The inner bevel is a 45° inner bevel.
4. The installation and welding structure of a rare earth wear-resistant pipeline according to claim 1, characterized in that: The outer bevel is a 35-40° outer bevel.
5. The installation and welding structure of a rare earth wear-resistant pipeline according to claim 1, characterized in that: The casing (1) includes two arc-shaped units, and the central angle of the arc-shaped unit is 180°.
6. The installation and welding structure of a rare earth wear-resistant pipeline according to claim 1, characterized in that: The casing (1) is a Q235 casing.