A tubing impairment welding and argon-filled simulation welding training device and method

Abstract

The present application provides a pipeline obstacle welding and argon filling simulation welding training device and method. The device comprises a pipeline fixing device, a pressing sealing device, a jacking sealing device and a plane mirror. A window is opened on the pipeline structure, and a pressing sealing device is installed on one side of the window, and a jacking sealing device is installed on the other side. The pipe to be welded is fixed on the window of the pipeline structure through the pressing sealing device and the jacking sealing device. An argon filling inlet is arranged at one end of the pipeline structure, an outlet valve is arranged at the other end, and an oxygen concentration detector is arranged at the middle part. One end of the pipeline fixing device is fixed on the obstacle vertical plate, and the distance between the pipe to be welded and the obstacle vertical plate can be adjusted by adjusting the distance between the threaded screw rod of the pipeline fixing device and the obstacle vertical plate. The welding is carried out by observing the shape and position of the molten pool through the plane mirror. The device is suitable for pipeline obstacle welding and argon filling simulation welding training device and method.

Description

Technical Field

[0001] This invention relates to the field of welding, specifically to a training device and method for simulating welding challenging obstacles in pipe systems and performing argon purging. Background Technology

[0002] Currently, pipeline welding in my country is widely used in shipbuilding, petrochemicals, aerospace, nuclear industry, power, construction, and machinery manufacturing. Pipeline welding technology is an indispensable processing method, but there is a shortage of human resources for pipeline welding, especially for highly skilled personnel capable of working in harsh welding environments and positions. Practical training for pipe welders mainly focuses on basic welding skills training for standard pipe fittings, lacking a systematic training method for highly skilled personnel. After completing basic welding skills training for standard pipe fittings, pipe welders are not fully competent for all construction positions. They lack the ability to perform tasks requiring high skill levels and in harsh welding environments and positions, and can only learn and accumulate experience during product production. This increases the training period and makes it difficult to guarantee welding quality, increasing the probability of product quality accidents. It fails to comprehensively meet the skill level requirements of pipe welding. Currently, practical training for pipe welders mainly uses basic welding skills training for standard pipe fittings, and a training device for pipe obstacle welding and argon-filled simulated welding is not used in the training process.

[0003] Therefore, it is crucial to bridge the final "mile" in training pipework welders. This can be achieved by constructing a simulated welding training device for pipework obstacles and argon purging. This device simulates real-world product welding conditions by rationally distributing obstacles during pipework welding, facilitating the smooth transition of new welders, new processes, and new technologies to production, and maintaining and improving the skills of experienced welders. It creates a more realistic practical environment for welders, shortens the "adaptation period" for newly hired welders, enriches the means of verifying welder skill levels, further improves welder training effectiveness, and reduces product quality risks. Therefore, a simulated welding training device and method for pipework obstacles and argon purging is urgently needed. Summary of the Invention

[0004] To address the shortcomings of existing technologies and improve welding training efficiency while reducing product construction quality risks, this invention provides a simulation welding training device and method for pipe system obstacle welding and argon purging. This method utilizes a simulation welding training device to construct a 1:1 scale pipe system welding obstacle and perform argon purging protection. It simulates the typical structural welds and spatial locations of ship piping systems under on-site construction conditions. During practical welding training, welders are given simulated exposure to actual production, accumulating construction experience and fully simulating and verifying their skill levels. This ensures that welders possess the necessary construction capabilities and experience to adapt to their welding positions after formal production commences. It also facilitates the smooth transition of new processes and technologies to production and maintains and enhances the skills of experienced welders. This solves the technical problems of insufficient human resources or substandard skill levels encountered in product piping welding, new process development, and promotion.

[0005] The solution adopted by this invention to solve the technical problem is: A training device for simulating welding of pipe system obstacles and argon purging includes a pipe fixing device, a pressing and sealing device, a top-tightening and sealing device, and a plane mirror; One end of the pipeline fixing device is fixed to the barrier plate, and the other end is used to fix the pipeline structure. One end of the pipeline structure is equipped with an argon inlet, and the other end is equipped with an outlet valve. An oxygen concentration detection hole is opened in the middle for installing an oxygen concentration detector. A window is opened on the pipeline structure, and a compression sealing device is installed at one end of the window and a top-tightening sealing device is installed at the other end. One end of the pipe fitting to be welded is inserted into the top-tightening sealing device, and the other end is placed on the compression sealing device for compression and fixation. A plane mirror is fixed on the barrier plate corresponding to the pipe fitting to be welded, and is used to observe the molten pool by reflecting the plane mirror when welding the pipe fitting.

[0006] To further address the technical problems addressed by this invention, the present invention provides a training method for welding pipe system obstacles and argon purging simulation welding, which includes the following steps: Step 1: Install the pipe fittings to be welded; Step 2: Adjust the distance between the piping structure and the barrier plate; Step 3: Pour argon and adjust the argon flow rate to ensure the purity and pressure of the argon gas inside the pipe fitting to be welded; Step 4: Mirror reflection welding; Step 5: After welding is completed, remove the pipe fitting to be welded, replace it with the next pipe fitting to be welded and continue training. The removed pipe fitting to be welded is then inspected for surface forming, internal quality and mechanical properties according to product requirements. The welder's skill level is assessed based on the inspection results.

[0007] Positive results: Practice has shown that the welding training of this invention can meet the quality requirements of product welding production. The most important aspect is the training method that uses welding at pipe system obstruction locations and argon-purified protection to simulate typical structural welds. This method involves creating a window of a specific size on the typical pipe system weld, assembling the machined beveled pipe fitting, placing it inside the window, and fixing it in place for welding according to the corresponding process. After welding, the pipe fitting is removed, and the next one is placed in the window for continued welding training. By simulating on-site construction conditions such as spatial location, the welding training allows welders to simulate actual production in advance, accumulate construction experience, fully simulate and verify their skill levels, ensure that welders have the corresponding construction capabilities and experience, and be deployed to key production positions in advance. It also ensures the smooth transformation of new processes and technologies into production and the maintenance and improvement of experienced welders' skills. This solves problems such as insufficient human resources or substandard skill levels in the product production process.

[0008] Typical piping system weld seams, through the opening of windows, allow for repeated use of simulated obstacle structures and argon purging. This reduces training costs while enabling trainees to experience the spatial location and environmental conditions of a construction site. Simulated obstacle welding training allows welders to simulate actual production conditions in advance, accumulating construction experience and improving welding skills—a once-in-a-lifetime benefit. Simultaneously, the removed pipe fittings are measured according to design requirements for surface dimensions, followed by internal non-destructive testing. Qualified fittings undergo mechanical property testing, ensuring that welders trained using the simulated welding system can meet product design requirements in subsequent work, encompassing surface finish, internal flaw detection quality, and mechanical properties. This effectively reduces the risk of quality accidents during the transition of new welders, processes, and technologies to production.

[0009] It is suitable for use as a training device and method for welding pipe system obstacles and argon-filled simulated welding. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The description of the present invention is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0011] Figure 1 This is a schematic diagram of the structure in this embodiment; Figure 2 This is a schematic diagram of the pipe fixing device in this embodiment; Figure 3 This is a schematic diagram of the compression sealing device in this embodiment; Figure 4 This is a schematic diagram of the top-tightening sealing device in this embodiment.

[0012] In the diagram, 1. Obstacle plate, 2. Exhaust valve, 3. Pipe fixing device, 3.1. Fixing bolt, 3.2. Sleeve, 3.3. Threaded screw, 3.4. Fastening screw, 4. Piping structure, 5. Compression sealing device, 5.1. Locking screw hole, 5.2. Locking lug, 5.3. Hinge, 5.4. Sealing ring, 5.5. Semi-circular clamp, 6. Pipe fitting to be welded, 7. Argon inlet, 8. Oxygen concentration detection hole, 9. Tightening sealing device, 9.1. Pipe slot, 9.2. Sealing gasket, 9.3. Telescopic fitting, 9.4. Telescopic limit stop, 9.5. Telescopic spring, 9.6. Central sealing plug I, 9.7. Central sealing plug II, 9.8. Connecting hose, 9.9. Connecting pipe head, 9.10. Pipe clamp, 10. Plane mirror. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0015] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0018] In the description of the embodiments in this application, the term "multiple" refers to two or more (including two). Similarly, "Multiple sets" refers to two or more sets (including two sets), and "multiple tablets" refers to two or more tablets (including two tablets).

[0019] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0020] In the description of the embodiments in this application, unless otherwise expressly specified and limited, the technical term "installation" will be used. Terms such as “connected,” “linked,” and “fixed” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0021] As shown in the figure, a pipe system obstacle welding and argon-filled simulated welding training device includes a pipe fixing device 3, a pressing and sealing device 5, a top-tightening and sealing device 9, and a plane mirror 10. One end of the pipeline fixing device 3 is fixed on the obstacle plate 1, and the other end is used to fix the pipeline structure 4; one end of the pipeline structure 4 is provided with an argon inlet 7, and the other end is provided with an outlet valve 2. An oxygen concentration detection hole 8 is opened in the middle part for installing an oxygen concentration detector. A window is made in the piping structure 4, and a compression sealing device 5 is installed at one end of the window and a top sealing device 9 is installed at the other end; one end of the pipe fitting 6 to be welded is inserted into the top sealing device 9, and the other end is placed on the compression sealing device 5 to be pressed and fixed. The plane mirror 10 is fixed on the obstacle plate 1 corresponding to the pipe fitting 6 to be welded, and is used to observe the molten pool by reflecting the plane mirror 10 when welding the pipe fitting 6.

[0022] To ensure the stability of the structure in this embodiment, the pipeline fixing device 3 consists of fixing bolts 3.1, sleeves 3.2, threaded screws 3.3 and fastening screws 3.4; The sleeve 3.2 is welded to the threaded rod 3.3 and fixed to the internal piping structure 4 using the fixing bolts 3.1 on it; one end of the threaded rod 3.3 is welded to the sleeve 3.2, and the other end passes through the obstacle plate 1 and is fixed to the obstacle plate 1 by the fastening screws 3.4.

[0023] To further ensure the stability of the structure in this embodiment, the compression sealing device 5 consists of a locking screw hole 5.1, a locking lug 5.2, a hinge 5.3, a sealing ring 5.4, and a semi-circular clamp tube 5.5; The locking screw hole 5.1 is opened on the locking lug 5.2; a sealing ring 5.4 is installed in the middle of the semi-circular clamp tube 5.5. The two semi-circular clamp tubes 5.5 are connected on one side by a hinge 5.3 installed on the longitudinal section. The locking lug 5.2 is welded on the longitudinal section of the other side of the two semi-circular clamp tubes 5.5. The bolts are passed through the locking screw holes 5.1 on the two locking lugs 5.2 and tightened to fix the pipe fitting 6 to be welded.

[0024] To optimize the structure of this embodiment, the top-tightening sealing device 9 is composed of a pipe opening groove 9.1, a sealing gasket 9.2, a telescopic pipe fitting 9.3, a telescopic limit stop 9.4, a telescopic spring 9.5, a central sealing plug I 9.6, a central sealing plug II 9.7, a connecting hose 9.8, a connecting pipe head 9.9, and a pipe clamp 9.10; One end of the pipe slot 9.1 is welded to the telescopic fitting 9.3, and a sealing gasket 9.2 is installed inside the pipe slot 9.1 for sealing; the telescopic fitting 9.3 is inserted into the pipe of the pipe system structure 4, and a telescopic spring 9.5 is installed between the telescopic fitting 9.3 and the pipe system structure 4, and is limited and fixed by the telescopic limit stop 9.4; The central sealing plug I 9.6 is welded inside the telescopic fitting 9.3. The central sealing plug I 9.6 has a hole in the middle and a connecting pipe head 9.9 is welded to it. The central sealing plug II 9.7 is welded inside the pipe of the piping structure 4. The central sealing plug II 9.7 has a hole in the middle and a connecting pipe head 9.9 is welded to it. One end of the connecting hose 9.8 is installed on the connecting pipe head 9.9 on the central sealing plug I 9.6, and the other end is installed on the connecting pipe head 9.9 on the central sealing plug II 9.7, and is fixed by the pipe clamp 9.10.

[0025] In this embodiment, during use, firstly, one end of the pipe fitting 6 to be welded is inserted into the pipe slot 9.1 of the top-tightening sealing device 9, and the other end is placed on the pressure sealing device 5. The upper and lower semi-circular clamps 5.5 are closed by the hinge 5.3, and the pipe fitting 6 to be welded is tightly fixed in the pressure sealing device 5 by bolts. Secondly, the distance between the pipe fitting 6 to be welded and the barrier plate 1 is adjusted to the required distance by adjusting the position of the threaded screw 3.3 on the pipeline fixing device 3 inserted into the barrier plate 1. Thirdly, argon gas is introduced into the pipeline structure 4 through the argon inlet 7. Argon is purged, and at the same time, the exhaust valve 2 is opened to expel the air inside the piping structure 4. The oxygen content of the oxygen concentration detector on the oxygen concentration detection hole 8 of the piping structure 4 is observed to determine the purity of the argon gas inside the pipe fitting 6 to be welded. After the argon gas purity is qualified, the exhaust volume of the exhaust valve 2 is reduced to ensure that the argon gas purity and pressure inside the pipe fitting 6 to be welded are appropriate. Finally, the pipe fitting 6 to be welded is welded at this time. When welding the weld seam on the side close to the barrier plate 1, due to the close distance, the shape of the molten pool is observed by the plane mirror 10 installed on the barrier plate 1 and the reflection principle of the plane mirror 10 is used to conduct the welding.

[0026] The working principle of this embodiment: The piping structure 4 has a window, with a compression sealing device 5 installed at one end of each side and a top-tightening sealing device 9 installed at the other end. The pipe fitting 6 to be welded is firmly fixed to the window position of the piping structure 4 by the compression sealing device 5 and the top-tightening sealing device 9. The pipe fitting 6 to be welded can be disassembled and replaced at will. The distance between the pipe fitting 6 and the obstacle plate 1 can be adjusted to the required position by adjusting the threaded screw 3.3 on the pipe fixing device 3 and inserting it into the obstacle plate 1. By adjusting the air intake of the argon inlet 7 and the exhaust volume of the outlet valve 2 on the piping structure 4, and by observing the oxygen content of the oxygen concentration detector installed on the oxygen concentration detection hole 8 of the piping structure 4, the purity and pressure of argon gas during the welding process can be controlled. By observing the plane mirror 10 installed on the obstacle plate 1, the mirror reflection welding can be performed using the reflection principle of the plane mirror 10, thus cultivating the welder's ability to weld in special confined spaces.

[0027] A typical piping structure 4 has a window. A compression sealing device 5 is installed at one end of the window, and a top-tightening sealing device 9 is installed at the other end. One end of the pipe fitting 6 to be welded is inserted into the pipe opening groove 9.1 of the top-tightening sealing device 9, ensuring that the end face of the pipe fitting 6 to be welded is tightly fitted with the sealing gasket 9.2 in the pipe opening groove 9.1. The other end is placed on the compression sealing device 5. The upper and lower semi-circular clamps 5.5 are closed by the hinges 5.3 installed on one side of the longitudinal section of the two semi-circular clamps 5.5. The pipe fitting 6 to be welded is then tightly fixed to the window of the piping structure 4 by bolts. The sealing ring 5.4 in the compression sealing device 5 plays a sealing role. The pipe fitting 6 to be welded can be disassembled and replaced at will.

[0028] The distance between the pipe system structure 4 and the barrier plate 1 can be adjusted to the required position by adjusting the threaded screw 3.3 on the pipe fixing device 3. Then, the pipe system structure 4 is fixed on the barrier plate 1 using the fastening screw 3.4. The distance between the pipe system structure 4 and the barrier can be adjusted at will according to training needs, which is convenient and simple to use.

[0029] By adjusting the air intake of the argon inlet 7 on the pipe structure 4 and the exhaust volume of the outlet valve 2, while observing the oxygen content of the oxygen concentration detector installed on the oxygen concentration detection hole 8 of the pipe structure 4, the purity and pressure of argon gas during the welding process are controlled to ensure the formation and quality of the internal weld of the pipe fitting 6 to be welded. When the distance between the barrier plate 1 and the pipe fitting 6 to be welded is close, the welder cannot observe the weld pool between them. By observing the plane mirror 10 installed on the barrier plate 1, the welder can perform mirror reflection welding by utilizing the reflection principle of the plane mirror 10, thereby cultivating the welder's ability to weld in special narrow spaces.

[0030] The working process of this embodiment: A training method for welding obstructions in piping systems and argon-filled simulated welding includes the following steps: Step 1: Install the pipe fittings to be welded 6; After the welding pipe fitting 6 is ground and assembled, one end of the welding pipe fitting 6 is inserted into the pipe opening groove 9.1 of the top sealing device 9 to ensure that the end face of the welding pipe fitting 6 is tightly fitted with the sealing gasket 9.2 in the pipe opening groove 9.1. The other end is placed on the pressure sealing device 5. The upper and lower semi-circular clamps 5.5 are closed by the hinges 5.3 installed on one side of the longitudinal section of the two semi-circular clamps 5.5. The welding pipe fitting 6 is then fastened to the window of the pipe system structure 4 and pressed into the pressure sealing device 5 by bolts. The sealing ring 5.4 in the pressure sealing device 5 plays a sealing role. Step 2: Adjust the distance between the piping structure 4 and the obstacle plate 1; After the pipe fitting 6 is installed and fixed, the welder, based on the spatial position of the structural weld and the needs of the on-site construction conditions simulation training, adjusts the distance between the pipe fitting 6 and the barrier plate 1 by adjusting the threaded screw 3.3 on the pipe fixing device 3 and the barrier plate 1, and then uses the fastening screw 3.4 to fix the pipe structure 4 on the barrier plate 1. Step 3: Pour argon and adjust the argon flow rate to ensure the purity and pressure of the argon gas inside the pipe fitting 6 to be welded; After steps one and two are completed, connect the argon cylinder to the argon inlet 7 via an argon gauge and hose, open the valve, and fill the pipe structure 4 with argon. At this time, open the outlet valve 2 to expel the air inside the pipe structure 4. By observing the oxygen content of the oxygen concentration detector installed on the oxygen concentration detection hole 8 of the pipe structure 4, determine the argon purity inside the pipe fitting 6 to be welded. After the argon purity is qualified, reduce the exhaust volume of the outlet valve 2. While ensuring the argon purity inside the pipe fitting 6 to be welded, a suitable argon pressure should also be maintained to meet the requirements of the root pass welding of the pipe fitting 6 to be welded. Step 4: Mirror reflection welding; After the purity and pressure of the argon gas inside the pipe fitting 6 meet the welding requirements, the root pass welding of the pipe fitting 6 begins. When welding the weld seam on the side of the pipe fitting 6 closest to the barrier plate 1, the welder cannot observe the molten pool on the weld seam at the welding position due to the close distance. Instead, the welder can only observe the shape of the molten pool by observing the plane mirror 10 installed on the barrier plate 1 and using the reflection principle of the plane mirror 10. When the root pass welding is nearing completion, the exhaust volume of the exhaust valve 2 is increased to reduce the argon gas pressure inside the pipe fitting and ensure the quality of the root pass weld joint. After the root pass is completed, the filling and cover pass welding are carried out in the same way until the welding of the pipe fitting 6 is completed. Step 5: After welding is completed, remove the pipe fitting 6 to be welded, replace it with the next pipe fitting 6 to be welded and continue training. The removed pipe fitting 6 to be welded is then inspected for surface forming, internal quality and mechanical properties according to product requirements. The skill level of the welder is assessed based on the inspection results.

[0031] Features of this embodiment: An integrated simulation piping system is used to simulate the welding obstacle environment of the actual piping system in production, and to conduct practical operation training on welding at obstacle locations and argon purging simulation.

[0032] The device features a window at a suitable location in the piping structure 4, with a compression sealing device 5 installed at one end and a top-tightening sealing device 9 at the other. The pipe fitting 6 to be welded is securely fixed to the window position in the piping structure 4 by the compression sealing device 5 and the top-tightening sealing device 9. The pipe fitting 6 can be easily replaced, disassembled, and is securely fixed with a good sealing effect. According to training needs, the distance between the pipe fitting 6 and the obstacle plate 1 can be adjusted to the required position by adjusting the threaded screw 3.3 on the pipe fixing device 3 and the obstacle plate 1. By adjusting the exhaust volume of the exhaust valve 2 on the piping structure 4 and observing the oxygen content of the oxygen concentration detector installed on the oxygen concentration detection hole 8 of the piping structure 4, the purity and pressure of argon gas during welding can be ensured to meet the welding requirements of the pipe fitting 6. By observing the plane mirror 10 installed on the obstacle plate 1, mirror reflection welding can be performed using the reflection principle of the plane mirror 10, thus cultivating the welder's ability to weld in special confined spaces.

[0033] Finally, it should be noted that: The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A training device for simulating welding of pipe system obstacles and argon purging, characterized in that: It includes a pipeline fixing device (3), a compression sealing device (5), a top sealing device (9), and a plane mirror (10). One end of the pipeline fixing device (3) is fixed on the obstacle plate (1), and the other end is used to fix the pipeline structure (4); one end of the pipeline structure (4) is provided with an argon inlet (7), the other end is provided with an outlet valve (2), and an oxygen concentration detection hole (8) is opened in the middle part for installing an oxygen concentration detector. A window is made on the piping structure (4), and a pressure sealing device (5) is installed at one end of the window and a top sealing device (9) is installed at the other end; one end of the pipe fitting (6) to be welded is inserted into the top sealing device (9), and the other end is placed on the pressure sealing device (5) to be pressed and fixed. The top-tight sealing device (9) consists of a pipe opening groove (9.1), a sealing gasket (9.2), a telescopic fitting (9.3), a telescopic limit stop (9.4), a telescopic spring (9.5), a central sealing plug I (9.6), a central sealing plug II (9.7), a connecting hose (9.8), a connecting pipe head (9.9), and a pipe clamp (9.10); One end of the pipe slot (9.1) is welded to the telescopic fitting (9.3), and a sealing gasket (9.2) is installed inside the pipe slot (9.1) for sealing; the telescopic fitting (9.3) is inserted into the pipe of the pipe system structure (4), and a telescopic spring (9.5) is installed between the telescopic fitting (9.3) and the pipe system structure (4), and is limited and fixed by the telescopic limit stop (9.4); The central sealing plug I (9.6) is welded inside the telescopic fitting (9.3). The central sealing plug I (9.6) has a hole in the middle and a connecting pipe head (9.9) is welded on it. The central sealing plug II (9.7) is welded inside the pipe of the piping structure (4). The central sealing plug II (9.7) has a hole in the middle and a connecting pipe head (9.9) is welded on it. One end of the connecting hose (9.8) is installed on the connecting pipe head (9.9) on the central sealing plug I (9.6) and the other end is installed on the connecting pipe head (9.9) on the central sealing plug II (9.7) and fixed by the pipe clamp (9.10). The plane mirror (10) is fixed on the obstacle plate (1) corresponding to the pipe fitting (6) to be welded. When welding the pipe fitting (6), the plane mirror (10) is used to observe the molten pool by reflecting the water.

2. The pipe system obstacle welding and argon purging simulation welding training device according to claim 1, characterized in that: The pipeline fixing device (3) consists of fixing bolts (3.1), sleeves (3.2), threaded screws (3.3) and fastening screws (3.4); The sleeve (3.2) is welded to the threaded rod (3.3) and fixed to the internal piping structure (4) by the fixing bolt (3.1) on the upper part; one end of the threaded rod (3.3) is welded to the sleeve (3.2), and the other end passes through the barrier plate (1) and is fixed to the barrier plate (1) by the fastening screw (3.4).

3. The pipe system obstacle welding and argon purging simulation welding training device according to claim 1, characterized in that: The compression sealing device (5) consists of a locking screw hole (5.1), a locking lug (5.2), a hinge (5.3), a sealing ring (5.4), and a semi-circular clamp tube (5.5); The locking screw hole (5.1) is opened on the locking lug (5.2); a sealing ring (5.4) is installed in the middle of the semi-circular clamp (5.5). The two semi-circular clamps (5.5) are connected on one side by a hinge (5.3) installed on the longitudinal section. The locking lug (5.2) is welded on the longitudinal section on the other side of the two semi-circular clamps (5.5). The bolt is passed through the locking screw hole (5.1) on the two locking lugs (5.2) and the bolt is tightened to fix the pipe fitting (6) to be welded.

4. A training method for welding obstructions in piping systems and argon-filled simulated welding, characterized by: The training device for simulating pipe system obstacle welding and argon purging welding according to any one of claims 1-3 includes the following steps: Step 1: Install the pipe fittings to be welded (6); After the welding pipe fitting (6) is polished and assembled, one end of the welding pipe fitting (6) is inserted into the pipe opening groove (9.1) of the top sealing device (9) to ensure that the end face of the welding pipe fitting (6) is tightly fitted with the sealing gasket (9.2) in the pipe opening groove (9.1). The other end is placed on the pressure sealing device (5). The upper and lower semi-circular clamps (5.5) are closed by the hinges (5.3) installed on one side of the longitudinal section of the two semi-circular clamps (5.5). The welding pipe fitting (6) is fastened to the window of the pipe system structure (4) and the pressure sealing device (5) is tightened by bolts. The sealing ring (5.4) in the pressure sealing device (5) plays a sealing role. Step 2: Adjust the distance between the piping structure (4) and the obstacle plate (1); After the pipe fitting (6) is installed and fixed, the welder, based on the spatial position of the structural weld and the needs of the on-site construction conditions simulation training, adjusts the distance between the pipe fitting (6) and the barrier plate (1) by adjusting the threaded screw (3.3) on the pipe fixing device (3) and the barrier plate (1) to the required position, and then uses the fastening screw (3.4) to fix the pipe system structure (4) on the barrier plate (1); Step 3: Fill with argon and adjust the argon flow rate to ensure the purity and pressure of the argon inside the pipe fitting (6) to be welded; After completing steps one and two, connect the argon cylinder to the argon inlet (7) through the argon gauge and hose, open the valve, and fill the pipe structure (4) with argon. At this time, open the outlet valve (2) to remove the air inside the pipe structure (4). By observing the oxygen content of the oxygen concentration detector installed on the oxygen concentration detection hole (8) of the pipe structure (4), determine the argon purity inside the pipe fitting (6) to be welded. After the argon purity is qualified, reduce the exhaust volume of the outlet valve (2). While ensuring the argon purity inside the pipe fitting (6) to be welded, a suitable argon pressure should also be maintained to meet the requirements of the root pass welding of the pipe fitting (6). Step 4: Mirror reflection welding; After the purity and pressure of the argon gas inside the pipe fitting (6) meet the welding requirements, the root pass welding of the pipe fitting (6) begins. When welding the weld seam on the side of the pipe fitting (6) close to the barrier plate (1), the welder cannot observe the molten pool on the weld seam at the welding position due to the close distance. The welder can only observe the shape of the molten pool by observing the plane mirror (10) installed on the barrier plate (1) and using the reflection principle of the plane mirror (10) to weld. When the root pass welding is nearing the end, the exhaust volume of the exhaust valve (2) is increased to reduce the argon gas pressure inside the pipe fitting and ensure the quality of the root pass weld joint. After the root pass is completed, the filling and cover welding are carried out in this way until the welding of the pipe fitting (6) is completed. Step 5: After welding is completed, remove the pipe fitting (6) to be welded and replace it with the next pipe fitting (6) to be welded to continue training. The removed pipe fitting (6) to be welded is then inspected for surface forming, internal quality and mechanical properties according to product requirements. The skill level of the welder is assessed based on the inspection results.

Images