A frame beam assembly welding method and welding fixture

Abstract

The invention discloses a frame beam assembly welding method and a welding fixture, and relates to the field of frame beam assembly welding. The frame beam assembly welding method is as follows: S1, mechanical cleaning and chemical cleaning; S2, placing the automobile frame beam assembly on a welding platform for semi-automatic arc welding; S3, monitoring the welding process through an intelligent welding monitoring system; S4, cleaning the surface of the automobile frame beam assembly after welding; S5, performing quality inspection on the weld; S6, recording the inspection results, issuing an inspection report, and polishing and painting the weld according to the inspection report. The invention can solve the problems of unstable welding quality, difficult positioning, cumbersome operation and potential safety hazards in the welding process by mechanically cleaning and chemically cleaning the automobile frame beam assembly and then placing the automobile frame beam assembly on a welding platform for semi-automatic arc welding.

Description

Technical Field

[0001] The invention relates to the technical field of frame beam assembly welding, in particular to a frame beam assembly welding method and a welding fixture. Background Art

[0002] Traditional frame beam assemblies have problems such as unstable welding quality, difficult positioning accuracy, cumbersome and complicated operation process, and potential safety hazards during welding, which affect the overall strength and durability of the frame beam assembly. The frame beam assembly welding of the present application performs mechanical and chemical cleaning on the automobile frame beam assembly, and then places the automobile frame beam assembly on a welding platform for semi-automatic arc welding. This can solve the problems of unstable welding quality, difficult positioning, cumbersome operation, and safety hazards in the welding process.

[0003] The defects of the existing frame beam assembly welding are:

[0004] Patent document KR101440994B1 discloses a front axle housing assembly welding fixture, which mainly considers how to adjust the position of the steering knuckle bracket and the front axle housing during welding, but does not consider how to solve the problems of unstable welding quality, difficult positioning, cumbersome operation and potential safety hazards in the welding process;

[0005] Patent document KR102153420B1 discloses a reversing device for trimming a door assembly welding unit. The document mainly considers the problem of how to remove welding beads or spatters from a door assembly, but does not consider how to solve the problems of difficult quality control of the frame beam assembly welding, low welding efficiency, and low welding quality.

[0006] Patent document CN108213793B discloses a rear side panel assembly welding production line and a rear side panel assembly welding method for automobiles. The document mainly considers how to reduce the equipment cost on the basis of ensuring the production rate of the rear side panel assembly welding production line for automobiles, but does not consider how to ensure the cleanliness of the weld surface, improve the strength and sealing of the welded joint, and enhance the standardization of operation.

[0007] Patent document CN106181194B discloses a welding fixture for an automobile end plate assembly. The document mainly considers the problem of how to complete the welding of the end plate welding assembly in one go, but does not consider how to solve the problems of difficulty in detecting internal defects of welds, low detection accuracy and reliability, difficulty in adapting to detection requirements of different shapes and structures, high detection cost and time, and difficulty in ensuring product quality and safety. Summary of the invention

[0008] The purpose of the present invention is to provide a frame beam assembly welding method and a welding fixture to solve the problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solution: a frame beam assembly welding method, the frame beam assembly welding method is as follows:

[0010] S1. Mechanically and chemically clean the automobile frame beam assembly;

[0011] S2. placing the automobile frame beam assembly on a welding platform for semi-automatic arc welding;

[0012] S3, monitor the welding process through the intelligent welding monitoring system;

[0013] S4. After welding is completed, clean the surface of the automobile frame beam assembly;

[0014] S5. After cleaning, the weld is inspected for quality, including appearance inspection and non-destructive testing;

[0015] S6. Record the test results, including the location, shape, size, quantity and corresponding defects of the magnetic marks, issue a test report, and grind and paint the weld according to the test report;

[0016] In S1, the following are also included:

[0017] S11. First, use a clean cloth to wipe the large impurities on the surface of the automobile frame beam assembly, then use a fine wire brush to further brush away the large impurities along the texture, then use a grinder to perform preliminary grinding to remove larger scales, rust and oil stains, and use a fine wire brush to grind the grooves and holes, then use a clean cloth and compressed air to clean the grinding chips and dust remaining on the surface;

[0018] S12. Completely immerse the area of ​​the automobile frame beam assembly that needs to be cleaned in the degreasing liquid, let it stand for 30 minutes, then take it out, rinse it thoroughly with clean water, wipe the automobile frame beam assembly dry with a clean cloth, and then blow it dry with compressed air;

[0019] In S2, it also includes the following:

[0020] S21, placing the automobile frame beam assembly on the top of the welding platform, detecting the distance between the second fixing plate and the automobile frame beam assembly by an infrared distance measuring sensor, and transmitting the detection information to the controller;

[0021] S22. Control the electric telescopic rod 1, the electric telescopic rod 2, the electric telescopic rod 3 and the electric telescopic rod 4 through the controller to drive the corner positioning block, the side positioning block, the inner positioning block pressure plate and the buffer pad to position the automobile frame beam assembly. After the automobile frame beam assembly is fixed, semi-automatic arc welding is used for welding.

[0022] Preferably, S3 further includes the following:

[0023] S31. The intelligent welding monitoring system includes a weld uniformity detection module, a weld straightness detection module, and a comprehensive evaluation and feedback module. The weld uniformity detection module and the weld straightness detection module are used to detect the uniformity and straightness of the automobile frame beam assembly during welding, respectively. The comprehensive evaluation and feedback is used to perform welding evaluation and adjustment according to the detection results.

[0024] S32, the weld uniformity detection module includes a welding parameter monitoring submodule and a visual detection submodule. The welding parameter monitoring submodule monitors the current and voltage in the welding process in real time through a current sensor and a voltage sensor. The visual detection submodule takes a weld image through a high-definition camera and analyzes the image using image processing technology.

[0025] S33, the weld straightness detection module includes a laser measurement submodule and an image processing submodule, the laser measurement submodule measures the weld trajectory by emitting a laser beam and receiving its reflected light, and the image processing submodule receives data from the laser measurement submodule and further analyzes the weld image using image processing technology;

[0026] S34. The comprehensive evaluation and feedback module includes a data analysis submodule and a feedback and adjustment submodule. The data analysis submodule evaluates the welding quality by conducting an in-depth analysis of the data on weld uniformity and straightness. The feedback and adjustment submodule provides feedback to operators and quality control personnel based on the results of the data analysis submodule.

[0027] Preferably, in S4, the following is also included:

[0028] S41. Use a fine wire brush to gently scrub the surface of the automobile frame beam assembly along the direction of the weld to remove spatter and loose slag on the surface. Then use a grinder to grind away the slag and impurities on the weld surface.

[0029] Preferably, in S5, the following is also included:

[0030] S51. First use a magnifying glass to visually inspect the weld surface, and then wear protective gloves to touch the weld surface for tactile inspection. If the surface of the automobile frame beam assembly is rough and granular, use a fine wire brush and a grinder to further clean it.

[0031] S52. Perform a cleanliness test. Use a clean white cotton cloth to wipe the weld surface and observe whether there are any black-gray stains attached to the cloth. If there are no stains on the cloth, no secondary cleaning is required. If there are stains on the cloth, secondary cleaning is required.

[0032] S53. Perform nondestructive testing on the automobile frame beam assembly by magnetic particle inspection. Apply a magnetic field to the weld of the automobile frame beam assembly and its surrounding area to cause local distortion of the magnetic lines of force on the surface and near the surface of the automobile frame beam assembly, forming a leakage magnetic field. While applying the magnetic field, spray magnetic powder evenly on the weld surface to observe the magnetic marks formed on the weld surface.

[0033] Preferably, the magnetic particle inspection includes an axial current passing method, a positive center conductor method and a ring-shaped cable winding method;

[0034] The axial current method is used to detect longitudinal defects parallel to the current direction, including the longitudinal fillet welds and the longitudinal parts of the T-shaped welds on the automobile frame beam assembly;

[0035] The positive center conductor method is used to detect longitudinal defects parallel to the current on the inner and outer surfaces of tubular automobile frame beam assemblies and radial defects with the magnetized conductor as the center of the circle;

[0036] The ring-shaped cable winding method is used to detect defects in the circumferential direction and defects perpendicular to the circumferential direction of the ring-shaped automobile frame beam assembly.

[0037] Preferably, a welding fixture for a frame beam assembly welding method comprises a welding platform, a frame beam assembly fixing module is installed on the top of the welding platform, the frame beam assembly fixing module is used to fix the frame beam assembly from the corner, side and inner side respectively, and the frame beam assembly fixing module comprises a corner fixing component, a side fixing component and an inner side fixing component;

[0038] The corner fixing assembly comprises a fixing plate 1 symmetrically mounted on the top of the welding platform, an electric telescopic rod 1 is mounted on one side of the fixing plate 1, and a corner positioning block is mounted on the output end of the electric telescopic rod 1;

[0039] The side fixing assembly comprises two sets of fixing plates 2 symmetrically mounted on the top of the welding platform, electric telescopic rods 2 are mounted on surfaces of the two sets of fixing plates 2 close to each other, and side positioning blocks are mounted on the output ends of the electric telescopic rods 2;

[0040] The inner fixing assembly comprises a fixing plate three installed at the center of the top of the welding platform, a symmetrically arranged electric telescopic rod three is installed on the outer side of the fixing plate three, and an inner positioning block is installed at the output end of the electric telescopic rod three.

[0041] Preferably, an automobile frame beam assembly is placed between the corner positioning block, the side positioning block and the inner positioning block, and the automobile frame beam assembly is located on the top of the welding platform.

[0042] Preferably, an infrared distance measuring sensor is embedded in the surfaces of the two fixing plates close to each other, and the infrared distance measuring sensor is used to detect the distance between the two fixing plates and the automobile frame beam assembly, and the output end of the infrared distance measuring sensor is connected to a controller.

[0043] Preferably, the fixing plate 3 is provided with symmetrically arranged mounting grooves, and two sets of symmetrically arranged sliding rods are installed inside the mounting grooves;

[0044] A symmetrically arranged servo motor is installed on the top of the fixing plate three, a ball screw is installed on the output end of the servo motor, one end of the ball screw is connected to the bottom of the mounting groove through a shaft, and the ball screw is located between the two sets of sliding rods;

[0045] The outer sides of the ball screw and the two sets of sliding rods are sleeved with sliding blocks, one side of the sliding block is installed with an electric telescopic rod four, the output end of the electric telescopic rod four is installed with a pressing plate, the bottom of the pressing plate is installed with a buffer pad, and the buffer pad is located above the automobile frame beam assembly;

[0046] The controller is electrically connected to the electric telescopic rod one, the electric telescopic rod two, the electric telescopic rod three, the servo motor and the electric telescopic rod four.

[0047] Preferably, the outer side of the welding platform is connected with four groups of baffles through hinges, and limiting grooves are provided on both sides of the top of the baffles, and L-shaped limiting plates are arranged inside the limiting grooves of the two groups of baffles close to each other, and a handle is installed on the top of the L-shaped limiting plate;

[0048] The top of a group of baffles on the back is connected with a cover plate through a hinge, a placement groove is opened at the bottom of the cover plate, and the top of the handle one is located inside the placement groove, and the top of the cover plate is installed with a handle two.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] 1. The present invention performs mechanical cleaning and chemical cleaning on the automobile frame beam assembly, and then places the automobile frame beam assembly on a welding platform for semi-automatic arc welding. Through meticulous mechanical cleaning and chemical cleaning steps, large particle impurities, oxide scale, rust and oil stains on the surface of the automobile frame beam assembly are effectively removed. If these impurities are not thoroughly removed, the quality and strength of the welding joint will be seriously affected, and even welding defects will be caused. The infrared ranging sensor and the controller are used in conjunction with the electric telescopic rod 1, the electric telescopic rod 2, the electric telescopic rod 3 and the electric telescopic rod 4 to achieve precise positioning of the automobile frame beam assembly. Compared with traditional manual positioning, this automated positioning method greatly improves the accuracy and efficiency of positioning, ensures the stability and consistency of the welding process, and thus improves The welding quality is improved. By designing multiple adjustable corner positioning blocks, side positioning blocks, inner positioning blocks and pressure plates, the welding fixture can adapt to automobile frame beam assemblies of different sizes and shapes, thereby improving the versatility and flexibility of the welding fixture. At the same time, semi-automatic arc welding is used for welding, which not only retains the flexibility of manual operation, but also assists in positioning through automated equipment, thereby reducing the time of manual adjustment, reducing the labor intensity of workers, and improving the overall welding efficiency. Through precise positioning and stable clamping, the movement or deformation of the frame beam assembly during welding is avoided, the potential harm to workers from welding spatter and high temperature is reduced, and the safety of the welding process is improved. Therefore, the problems of unstable welding quality, difficult positioning, cumbersome operation and potential safety hazards in the welding process can be solved.

[0051] 2. The present invention monitors the welding process through an intelligent welding monitoring system. The intelligent welding monitoring system includes a weld uniformity detection module, a weld straightness detection module and a comprehensive evaluation and feedback module. Through the weld uniformity detection module and the weld straightness detection module, real-time monitoring of key parameters in the welding process and accurate detection of weld quality are realized, which helps to timely discover problems in the welding process, including unstable current and voltage, inconsistent weld width and weld bending, so as to ensure that the welding quality meets the standards. At the same time, the comprehensive evaluation and feedback module conducts in-depth analysis of the weld quality data through the data analysis submodule, providing scientific and objective evaluation results for operators and quality control personnel. These data not only help to understand the overall quality of welding, but also provide a scientific and objective evaluation result for operators and quality control personnel. The intelligent welding monitoring system can not only monitor the body condition, but also provide strong support for improving welding technology and optimizing welding parameters. The intelligent welding monitoring system can automatically complete the detection and analysis of weld quality, reducing the time and labor cost of manual detection. Through real-time feedback and adjustment, it can quickly correct deviations in the welding process and avoid rework due to quality problems, thereby improving the overall welding efficiency. In the traditional welding process, human factors often have a greater impact on the welding quality. The intelligent welding monitoring system reduces the links of human intervention and judgment through automated and intelligent detection and analysis methods, and reduces welding quality problems caused by human errors. Therefore, it can solve the problems of difficult welding quality control, low welding efficiency and low welding quality of the frame beam assembly.

[0052] 3. The present invention performs an appearance inspection on the weld. First, a magnifying glass is used to visually inspect the weld surface. Then, protective gloves are worn to touch the weld surface for a touch inspection. The visual inspection and touch inspection with a magnifying glass can intuitively evaluate the quality of the weld surface, which is helpful to find defects on the weld surface, including but not limited to cracks, pores, slag inclusions and unfusion, as well as excessive surface roughness or the presence of particulate matter. If these defects are not discovered and handled in time, they will affect the strength and sealing of the weld joint, and further affect the performance of the entire automobile frame beam assembly. Then a cleanliness test is performed. A clean white cotton cloth is used to wipe the weld surface to observe whether there are black and gray stains attached to the cloth. The cleanliness of the weld can be intuitively judged. If there are stains on the weld surface, it means that the cleaning work is not thorough. At the bottom, secondary cleaning is needed, which helps to avoid welding quality problems caused by residues, including pores and slag inclusions. Through strict appearance inspection and cleanliness testing, the weld surface quality can be ensured to be good, free of defects and residues, which helps to improve the strength and sealing of the welded joint, thereby improving the quality of the entire automobile frame beam assembly. At the same time, it also helps to reduce the rework and repair costs caused by welding quality problems. At the same time, taking appearance inspection and cleanliness testing as necessary steps in the welding process can enhance the standardization and sense of responsibility of operators, help reduce welding quality problems caused by improper operation, and improve production efficiency and product quality. Therefore, it can solve the problems of ensuring the cleanliness of the weld surface, improving the strength and sealing of the welded joint, and enhancing the standardization of operations.

[0053] 4. The present invention performs nondestructive testing on welds and magnetic particle flaw detection on automobile frame beam assemblies. A magnetic field is applied to the welds of the automobile frame beam assembly and the surrounding areas, so that the magnetic lines of force on the surface and near the surface of the automobile frame beam assembly are locally distorted to form a leakage magnetic field. While applying the magnetic field, magnetic powder is evenly sprayed on the weld surface to observe the magnetic traces formed on the weld surface. Traditional appearance inspection can only find defects on the weld surface, while magnetic particle flaw detection can detect tiny cracks, pores and slag inclusions inside the weld and its surrounding areas. If these internal defects are not discovered and handled in time, they will have a serious impact on the structural strength and safety of the automobile frame beam assembly. Magnetic particle flaw detection uses the interaction between the magnetic field and magnetic powder to form intuitive magnetic traces to display the location and shape of the defects. This method has high detection sensitivity and intuitive results. The magnetic particle inspection provides axial current-passing method, positive center conductor method and ring-shaped cable winding method, etc., to meet the inspection needs of automobile frame beam assemblies of different shapes and structures. Compared with destructive inspection, magnetic particle inspection is a non-destructive inspection method and will not cause any damage to the automobile frame beam assembly. Therefore, it can be inspected without destroying the product, reducing the inspection cost and time. Through magnetic particle inspection, weld defects can be discovered and handled in time, which can ensure that the welding quality of the automobile frame beam assembly meets the standards, thereby improving the overall quality and safety of the product. Therefore, it can solve the problems of difficult detection of internal defects in welds, low detection accuracy and reliability, difficulty in adapting to the inspection needs of different shapes and structures, high detection cost and time, and difficulty in ensuring product quality and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 The figure is a flow chart of the welding method of the present invention.

[0055] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0056] Figure 3 It is a schematic diagram of a top cross-sectional structure of the present invention;

[0057] Figure 4 It is a front cross-sectional structural schematic diagram of the present invention;

[0058] Figure 5 It is a schematic diagram of the side cross-sectional structure of the present invention;

[0059] Figure 6 It is a schematic diagram of the internal structure of the baffle and cover plate of the present invention.

[0060] In the figure: 1. welding platform; 2. fixing plate 1; 3. electric telescopic rod 1; 4. corner positioning block; 5. fixing plate 2; 6. electric telescopic rod 2; 7. side positioning block; 8. fixing plate 3; 9. electric telescopic rod 3; 10. inner positioning block; 11. automobile frame beam assembly; 12. infrared ranging sensor; 13. mounting slot; 14. sliding rod; 15. ball screw; 16. sliding block; 17. electric telescopic rod 4; 18. pressure plate; 19. buffer pad; 20. baffle; 21. limit slot; 22. L-shaped limit plate; 23. cover plate; 24. placement slot. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] See also Figure 1 and Figure 2 The present invention provides an embodiment: a frame beam assembly welding method, the frame beam assembly welding method is as follows:

[0065] S1, mechanically cleaning and chemically cleaning the automobile frame beam assembly 11;

[0066] In S1, the following are also included:

[0067] S11. First, use a clean cloth to wipe the large impurities on the surface of the automobile frame beam assembly 11, and then use a fine wire brush to further brush away the large impurities along the texture, and then use a grinder to perform preliminary grinding to remove larger oxide scales, rust and oil stains, and use a fine wire brush to grind the grooves and holes, and then use a clean cloth and compressed air to clean the grinding chips and dust remaining on the surface;

[0068] S12. Completely immerse the area of ​​the automobile frame beam assembly 11 that needs to be cleaned in the degreasing liquid, let it stand for 30 minutes, then take it out, rinse it thoroughly with clean water, wipe the automobile frame beam assembly 11 dry with a clean cloth, and then blow it dry with compressed air.

[0069] Further, first, use a clean cloth to wipe the large particles of impurities on the surface of the automobile frame beam assembly 11 to reduce the burden of subsequent cleaning work, and then use a fine wire brush to further brush away the remaining large particles of impurities and attached dirt along the texture direction of the automobile frame beam assembly 11, which helps to deeply clean the uneven surface area;

[0070] Subsequently, the automobile frame beam assembly 11 is preliminarily polished using a grinding wheel machine, with a focus on removing larger scales, rust and stubborn oil stains. The polishing force and speed must be controlled to avoid excessive damage to the automobile frame beam assembly 11. The grooves and holes on the automobile frame beam assembly 11 are finely polished using a fine steel wire brush to ensure that these hard-to-reach areas can also be thoroughly cleaned. Finally, a clean cloth and compressed air are used to clean the grinding chips, dust and tiny particles remaining on the surface of the automobile frame beam assembly 11 to ensure that the surface is clean and free of residue.

[0071] Completely immerse the area of ​​the mechanically cleaned automobile frame beam assembly 11 that needs to be cleaned in the degreasing liquid. The degreasing liquid can effectively remove surface oil and residual chemicals to provide better joining conditions for welding. After standing for 30 minutes, take the automobile frame beam assembly 11 out of the degreasing liquid and rinse it thoroughly with clean water to remove the residual degreasing liquid and dissolved dirt. Use a clean cloth to wipe the automobile frame beam assembly 11 dry to remove surface moisture. Then, use compressed air to further blow it dry to ensure that all gaps and holes are dry and water-free to avoid defects during welding.

[0072] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The present invention provides an embodiment: a frame beam assembly welding method, the frame beam assembly welding method is as follows:

[0073] S2, placing the automobile frame beam assembly 11 on the welding platform 1 for semi-automatic arc welding;

[0074] In S2, it also includes the following:

[0075] S21, placing the automobile frame beam assembly 11 on the top of the welding platform 1, detecting the distance between the fixing plate 2 5 and the automobile frame beam assembly 11 by the infrared distance measuring sensor 12, and transmitting the detection information to the controller;

[0076] S22, control the electric telescopic rod 1 3, the electric telescopic rod 2 6, the electric telescopic rod 3 9 and the electric telescopic rod 4 17 through the controller to drive the corner positioning block 4, the side positioning block 7, the inner positioning block 10, the pressure plate 18 and the buffer pad 19 to position the automobile frame beam assembly 11, and after the automobile frame beam assembly 11 is fixed, semi-automatic arc welding is used for welding.

[0077] Further, first, the automobile frame beam assembly 11 is placed on the top of the welding platform 1 to ensure that the frame beam assembly is stably and centrally placed on the welding platform 1, and then, the infrared distance sensor 12 is used to detect the distance between the fixing plate 2 5 and the automobile frame beam assembly 11. The infrared distance sensor 12 can measure the distance in a non-contact manner with high precision and high stability. The distance information detected by the infrared distance sensor 12 is transmitted to the controller in real time, and the controller is responsible for receiving and processing the sensor data;

[0078] After receiving the distance information, the controller controls the electric telescopic rod 1 3, the electric telescopic rod 2 6, the electric telescopic rod 3 9 and the electric telescopic rod 4 17 to move. The electric telescopic rod 1 3, the electric telescopic rod 2 6, the electric telescopic rod 3 9 and the electric telescopic rod 4 17 respectively drive the corner positioning block 4, the side positioning block 7, the inner positioning block 10, the pressure plate 18 and the buffer pad 19 to perform all-round and multi-point precise positioning of the automobile frame beam assembly 11. When the automobile frame beam assembly 11 is accurately positioned and fixed, semi-automatic arc welding is started. Semi-automatic arc welding combines the advantages of automatic control and manual operation, which can not only improve the accuracy and efficiency of welding, but also can flexibly cope with complex welding conditions.

[0079] See also Figure 1 The present invention provides an embodiment: a frame beam assembly welding method, the frame beam assembly welding method is as follows:

[0080] S3, monitor the welding process through the intelligent welding monitoring system;

[0081] In S3, it also includes the following:

[0082] S31, the intelligent welding monitoring system includes a weld uniformity detection module, a weld straightness detection module and a comprehensive evaluation and feedback, the weld uniformity detection module and the weld straightness detection module are respectively used to detect the uniformity and straightness of the automobile frame beam assembly 11 during the welding process, and the comprehensive evaluation and feedback are used to perform welding evaluation and adjustment according to the detection results;

[0083] S32, the weld uniformity detection module includes a welding parameter monitoring submodule and a visual detection submodule. The welding parameter monitoring submodule monitors the current and voltage in the welding process in real time through a current sensor and a voltage sensor. The visual detection submodule takes a weld image through a high-definition camera and analyzes the image using image processing technology.

[0084] S33, the weld straightness detection module includes a laser measurement submodule and an image processing submodule, the laser measurement submodule measures the weld trajectory by emitting a laser beam and receiving its reflected light, and the image processing submodule receives data from the laser measurement submodule and further analyzes the weld image using image processing technology;

[0085] S34. The comprehensive evaluation and feedback module includes a data analysis submodule and a feedback and adjustment submodule. The data analysis submodule evaluates the welding quality by conducting an in-depth analysis of the data on weld uniformity and straightness. The feedback and adjustment submodule provides feedback to operators and quality control personnel based on the results of the data analysis submodule.

[0086] Furthermore, the intelligent welding monitoring system is a comprehensive monitoring system, which consists of three core parts: weld uniformity detection module, weld straightness detection module and comprehensive evaluation and feedback module. The weld uniformity detection module is responsible for detecting the uniformity of the weld during the welding process to ensure that the parameters of the weld meet the design requirements. The weld straightness detection module focuses on the straightness detection of the weld to prevent bending and twisting defects in the weld, which affect the welding strength and appearance quality. The comprehensive evaluation and feedback module conducts in-depth data analysis and comprehensive evaluation based on the detection data of the first two modules, and provides accurate feedback and adjustment suggestions for operators and quality control personnel;

[0087] The weld uniformity detection module includes a welding parameter monitoring submodule and a visual detection submodule. The welding parameter monitoring submodule monitors the current and voltage in the welding process in real time through current sensors and voltage sensors to ensure that the welding parameters are stable within the preset range, thereby ensuring the uniformity of the weld. The visual detection submodule uses a high-definition camera to capture weld images and analyzes the images through image processing technology to identify the geometric features and surface quality of the weld, thereby further verifying the uniformity of the weld.

[0088] The weld straightness detection module consists of a laser measurement submodule and an image processing submodule. The laser measurement submodule accurately measures the weld trajectory by emitting a laser beam and receiving its reflected light, obtains the three-dimensional coordinate information of the weld, and provides basic data for evaluating the weld straightness. The image processing submodule receives the data from the laser measurement submodule and uses image processing technology to further analyze the weld image, extract the weld contour and feature points, and calculate the weld straightness index.

[0089] The comprehensive evaluation and feedback module comprehensively evaluates the welding quality by conducting in-depth analysis of the data on weld uniformity and straightness. The comprehensive evaluation and feedback module includes a data analysis submodule and a feedback and adjustment submodule. The data analysis submodule uses advanced algorithms and models to process and analyze the detection data to identify abnormal conditions and potential problems in the welding process. The feedback and adjustment submodule provides real-time feedback information and adjustment suggestions to operators and quality control personnel based on the results of the data analysis submodule. Operators can adjust welding parameters or operating techniques in a timely manner based on the feedback, and quality control personnel can continuously optimize and improve the welding process based on the feedback results.

[0090] See also Figure 1 The present invention provides an embodiment: a frame beam assembly welding method, the frame beam assembly welding method is as follows:

[0091] S4. After welding is completed, clean the surface of the automobile frame beam assembly 11;

[0092] In S4, it also includes the following:

[0093] S41. Use a fine steel wire brush to gently scrub the surface of the automobile frame beam assembly 11 along the direction of the weld to remove spatter and loose slag on the surface, and then use a grinder to grind and remove slag and impurities on the weld surface.

[0094] Further, use a fine wire brush to gently brush the surface of the automobile frame beam assembly 11 along the direction of the weld to avoid damage to the weld itself. The fine wire brush can effectively remove impurities without causing scratches or excessive wear on the metal surface. Preliminary removal of spatter and loose slag generated during welding. Spatter is formed by high-temperature metal droplets splashing around the weld during welding, which not only affects the appearance but also causes obstacles to subsequent processing. Loose slag may fall off due to vibration or wind, affecting the cleanliness and stability of the parts.

[0095] Then use a grinder to further remove the slag and stubborn impurities on the weld surface, making the weld surface smoother and more uniform. The use of a grinder can deeply clean the tiny gaps and bumps that are difficult to reach with a fine wire brush, thereby improving the cleaning effect. By thoroughly cleaning the impurities and slag on the weld surface, the integrity and strength of the weld can be ensured, avoiding welding defects caused by the presence of impurities. At the same time, a clean weld surface is conducive to the adhesion and uniform distribution of the paint, thereby improving the quality and durability of the coating.

[0096] See also Figure 1 The present invention provides an embodiment: a frame beam assembly welding method, the frame beam assembly welding method is as follows:

[0097] S5. After cleaning, the weld is inspected for quality, including appearance inspection and non-destructive testing;

[0098] In S5, it also includes the following:

[0099] S51. First, use a magnifying glass to visually inspect the weld surface, and wear protective gloves to touch the weld surface for touch inspection. If the surface of the automobile frame beam assembly 11 is rough and granular, use a fine wire brush and a grinder to further clean it.

[0100] S52. Perform a cleanliness test. Use a clean white cotton cloth to wipe the weld surface and observe whether there are any black-gray stains attached to the cloth. If there are no stains on the cloth, no secondary cleaning is required. If there are stains on the cloth, secondary cleaning is required.

[0101] S53. Perform nondestructive testing on the automobile frame beam assembly 11 by magnetic particle inspection. Apply a magnetic field to the weld of the automobile frame beam assembly 11 and its surrounding area to cause local distortion of the magnetic lines of force on the surface and near the surface of the automobile frame beam assembly 11, thereby forming a leakage magnetic field. While applying the magnetic field, evenly spray magnetic powder on the weld surface to observe the magnetic marks formed on the weld surface.

[0102] Further, preliminarily evaluate the appearance quality and surface condition of the weld to ensure that there are no obvious defects and uncleaned areas. Use a magnifying glass for visual inspection to more clearly observe the fine structure and defects on the weld surface. Then put on protective gloves to touch the weld surface to judge the flatness, roughness and whether there is a granular feel. If the surface is rough or granular, it may mean that further cleaning is needed. If cleaning is found, use a fine wire brush and a grinder to clean the weld surface again until the surface is clean and flat.

[0103] The purpose of the cleanliness test is to verify the cleanliness of the weld surface and ensure that there are no residual pollutants or impurities. Use a clean white cotton cloth to gently wipe the weld surface to collect possible stains and observe whether there are black, gray or other colored stains attached to the cotton cloth. If there are no stains on the cotton cloth, it means that the weld surface is clean enough. If there are stains, secondary cleaning is required until there are no stains on the cotton cloth.

[0104] The purpose of non-destructive testing is to detect possible cracks and pore defects inside and around the weld in a non-destructive way. A magnetic field is applied to the weld of the automobile frame beam assembly 11 and its surrounding area to locally distort the magnetic lines of force on the surface and near the surface, forming a leakage magnetic field. While applying the magnetic field, magnetic powder is evenly sprayed on the weld surface. Under the action of the leakage magnetic field, the magnetic powder will be adsorbed to the defect, forming a visible magnetic mark.

[0105] Carefully observe the magnetic marks formed on the weld surface to determine whether there are cracks and pore defects. The shape, size and distribution of the magnetic marks can provide important information about the type, location and size of the defects. The defects corresponding to the magnetic particle inspection results are as follows:

[0106] Magnetic trace shape Magnetic trace position Corresponding defect situation Straight Line At or near the center of the weld Longitudinal cracks, lack of fusion, lack of penetration Round or oval Weld surface Porosity, slag inclusions, point defects Chain Weld Continuous Area Continuously distributed cracks, lack of fusion Branched or forked Irregular areas near welds Complex cracks, dendritic cracks Circular or arc Circumferential weld area Circumferential cracks and defects Cluster Local area of ​​weld surface Dense pores and slag inclusions Blurred or irregular shapes Weld edges or irregular areas Welding deformation and early signs of cold cracks

[0107] See also Figure 1 The present invention provides an embodiment: a frame beam assembly welding method, the frame beam assembly welding method is as follows:

[0108] S6. Record the test results, including the location, shape, size, quantity and corresponding defects of the magnetic marks, issue a test report, and grind and paint the weld according to the test report.

[0109] Furthermore, by recording the test results and issuing a test report, defects in the welds of the automobile frame beam assembly 11 can be discovered and dealt with in a timely manner, ensuring that the weld quality meets the standards and requirements. Grinding and painting the welds can further improve the overall quality and reliability of the automobile frame beam assembly 11 and extend its service life. Detailed test records and reports provide an important basis for subsequent traceability management, which helps to quickly locate the cause of the problem and take corresponding corrective measures.

[0110] See also Figure 1 , an embodiment provided by the present invention: a frame beam assembly welding method, magnetic particle flaw detection includes axial current passing method, positive center conductor method and ring-shaped cable winding method;

[0111] The axial current method is used to detect longitudinal defects parallel to the current direction, including longitudinal fillet welds and longitudinal portions of T-shaped welds on the automobile frame beam assembly 11;

[0112] The positive center conductor method is used to detect longitudinal defects parallel to the current on the inner and outer surfaces of the tubular automobile frame beam assembly 11 and radial defects with the magnetized conductor as the center;

[0113] The ring-shaped cable winding method is used to detect defects in the circumferential direction of the ring-shaped automobile frame beam assembly 11 and defects perpendicular to the circumferential direction.

[0114] Furthermore, the axial current method is used to detect longitudinal defects parallel to the current direction. In the welding of the automobile frame beam assembly 11, it is suitable for detecting the longitudinal portions of the longitudinal fillet welds and T-shaped welds. These welds are prone to cracks or other longitudinal defects along their length when subjected to stress, so the axial current method can accurately identify these potential problems.

[0115] The positive center conductor method is suitable for detecting longitudinal defects parallel to the current on the inner and outer surfaces of tubular automobile frame beam assemblies, as well as radial defects with the magnetized wire as the center of the circle, because tubular structures are prone to defects parallel to or perpendicular to the axis during manufacturing and welding;

[0116] The ring-shaped cable winding method is used to detect defects in the circumferential direction and defects perpendicular to the circumferential direction of the ring-shaped automobile frame beam assembly. The ring structure is prone to circumferential cracks or defects in the connection with other structures during the welding process. This method can effectively identify these problems.

[0117] See also Figure 1 and Figure 2 , an embodiment provided by the present invention: a welding fixture for a frame beam assembly welding method, comprising a welding platform 1, a frame beam assembly fixing module is installed on the top of the welding platform 1, the frame beam assembly fixing module is used to fix the frame beam assembly from the corner, side and inner side respectively, and the frame beam assembly fixing module comprises a corner fixing component, a side fixing component and an inner side fixing component;

[0118] The corner fixing assembly includes a fixing plate 2 symmetrically mounted on the top of the welding platform 1, an electric telescopic rod 3 is mounted on one side of the fixing plate 2, and a corner positioning block 4 is mounted on the output end of the electric telescopic rod 3;

[0119] The side fixing assembly includes two sets of fixing plates 2 5 symmetrically mounted on the top of the welding platform 1, and the surfaces of the two sets of fixing plates 2 5 close to each other are mounted with electric telescopic rods 2 6, and the output ends of the electric telescopic rods 2 6 are mounted with side positioning blocks 7;

[0120] The inner fixing assembly includes a fixing plate 3 8 installed at the top center of the welding platform 1, and symmetrically arranged electric telescopic rods 3 9 are installed on the outer side of the fixing plate 3 8, and an inner positioning block 10 is installed at the output end of the electric telescopic rods 3 9.

[0121] An automobile frame beam assembly 11 is placed between the corner positioning block 4 , the side positioning block 7 and the inner positioning block 10 , and the automobile frame beam assembly 11 is located on the top of the welding platform 1 .

[0122] Furthermore, the welding platform 1 serves as the basis of the entire welding fixture, and provides a stable support surface, so that the automobile frame beam assembly 11 can be welded in a horizontal and stable environment; the surface of the welding platform 1 is flat and smooth, which can reduce friction and damage to the automobile frame beam assembly 11. At the same time, the welding platform 1 has sufficient strength and rigidity to withstand various forces and vibrations during the welding process;

[0123] The frame beam assembly fixing module realizes all-round and multi-angle fixing of the automobile frame beam assembly 11 through fixing components in three directions: corner, side and inner side. This multi-point fixing method helps to reduce the deformation and displacement of the automobile frame beam assembly 11 during welding and improve the welding quality;

[0124] The corner fixing assembly includes a fixing plate 2, an electric telescopic rod 3 and a corner positioning block 4. The fixing plate 2 is fixed on the welding platform 1. The electric telescopic rod 3 is telescopically adjusted according to the corner size of the automobile frame beam assembly 11, so that the corner positioning block 4 can closely fit and fix the corner of the automobile frame beam assembly 11. The fixing force and position can be conveniently adjusted through electric control.

[0125] The side fixing assembly includes two sets of fixing plates 2 5, electric telescopic rods 2 6 and side positioning blocks 7; the two sets of fixing plates 2 5 are symmetrically installed on the welding platform 1, and each set of fixing plates 2 5 is installed with an electric telescopic rod 2 6. The telescopic movement of the electric telescopic rod 2 6 drives the side positioning block 7 to move toward the side of the automobile frame beam assembly 11, so as to achieve tight fixing of the side, and can adapt to automobile frame beam assemblies 11 of different widths;

[0126] The inner fixing assembly includes a fixing plate 38, an electric telescopic rod 39 and an inner positioning block 10; the fixing plate 38 is installed at the top center position of the welding platform 1, and the electric telescopic rod 39 is symmetrically arranged on the outer side of the fixing plate 38. Through the telescopic movement of the electric telescopic rod 39, the inner positioning block 10 can move toward the inner side of the automobile frame beam assembly 11 to achieve inner fixation, which helps to prevent the automobile frame beam assembly 11 from twisting or deformation during the welding process.

[0127] See also Figure 3 An embodiment of the present invention is a welding fixture for a frame beam assembly welding method, wherein the surfaces of the fixing plates 5 that are close to each other are embedded with infrared ranging sensors 12, and the infrared ranging sensors 12 are used to detect the distance between the fixing plates 5 and the automobile frame beam assembly 11, and the output end of the infrared ranging sensor 12 is connected to a controller.

[0128] Furthermore, the infrared ranging sensor 12 can accurately measure the slight distance changes between the fixing plate 25 and the automobile frame beam assembly 11 in real time. This high-precision measurement capability helps to ensure that the frame beam assembly always maintains the correct position and posture during the welding process. By connecting to the controller, the infrared ranging sensor 11 can transmit the measured distance data to the controller. The controller can dynamically adjust the telescopic length of the electric telescopic rod 26 based on the data, thereby achieving precise control of the side positioning block 7.

[0129] See also Figure 4 and Figure 5, an embodiment of the present invention provides: a welding fixture for a frame beam assembly welding method, wherein the interior of the fixing plate 8 is provided with symmetrically arranged mounting grooves 13, and the interior of the mounting groove 13 is provided with two symmetrically arranged sets of sliding rods 14;

[0130] A symmetrically arranged servo motor is installed on the top of the fixing plate 3 8, and a ball screw 15 is installed on the output end of the servo motor. One end of the ball screw 15 is connected to the bottom of the mounting groove 13 through a shaft, and the ball screw 15 is located between the two sets of sliding rods 14;

[0131] The outer sides of the ball screw 15 and the two sets of sliding rods 14 are sleeved with a sliding block 16, one side of the sliding block 16 is installed with an electric telescopic rod 4 17, the output end of the electric telescopic rod 4 17 is installed with a pressing plate 18, the bottom of the pressing plate 18 is installed with a buffer pad 19, and the buffer pad 19 is located above the automobile frame beam assembly 11;

[0132] The controller is electrically connected to the electric telescopic rod 1 3 , the electric telescopic rod 2 6 , the electric telescopic rod 3 9 , the servo motor and the electric telescopic rod 4 17 .

[0133] Furthermore, the mounting grooves 13 symmetrically opened inside the fixing plate 3 8 provide installation space for the servo motor and the ball screw 15, and also provide a track for the sliding of the sliding block 16. The two sets of symmetrically arranged sliding rods 14 not only provide additional support for the sliding block 16, but also ensure its stability and linearity during the sliding process.

[0134] The servo motor installed on the top of the fixed plate 3 8 has the characteristics of high precision and high response speed, and can accurately control the rotation of the ball screw 15 according to the instructions of the controller. The ball screw 15 is connected to the bottom of the installation groove 13 through a shaft and is located between the two sets of sliding rods 14. When the servo motor drives the ball screw 15 to rotate, it drives the sliding block 16 to slide up and down;

[0135] The sliding block 16 is sleeved on the outer sides of the ball screw 15 and the two sets of sliding rods 14, and can slide stably along them. An electric telescopic rod 17 is installed on one side of the sliding block 16, and a pressing plate 18 is installed on the output end of the electric telescopic rod 17 to fix the inner side of the automobile frame beam assembly 11. Through the telescopic movement of the electric telescopic rod 17, the distance between the pressing plate 18 and the automobile frame beam assembly 11 can be adjusted to ensure the fixing effect;

[0136] The buffer pad 19 installed at the bottom of the pressure plate 18 plays a role of buffering and protection, preventing the pressure plate 18 from directly crushing the surface of the automobile frame beam assembly 11. At the same time, the buffer pad 19 can also provide a certain elasticity, making the fixing effect more uniform and stable;

[0137] The controller is electrically connected to the electric telescopic rod 1 3, the electric telescopic rod 2 6, the electric telescopic rod 3 9, the servo motor and the electric telescopic rod 4 17, thereby realizing centralized control and automated operation of the entire welding fixture. The controller can accurately control the movement of each electric telescopic rod and the servo motor, thereby realizing accurate fixation and positioning of the automobile frame beam assembly 11.

[0138] See also Figure 5 and Figure 6 An embodiment of the present invention is a welding fixture for a frame beam assembly welding method, wherein the outer side of the welding platform 1 is connected with four groups of baffles 20 through hinges, and limiting grooves 21 are provided on both sides of the top of the baffles 20, and L-shaped limiting plates 22 are arranged inside the limiting grooves 21 of two groups of baffles 20 close to each other, and a handle 1 is installed on the top of the L-shaped limiting plate 22;

[0139] The top of a group of baffles 20 on the back is connected to a cover plate 23 through a hinge. A placement groove 24 is opened at the bottom of the cover plate 23, and the top of the handle 1 is located inside the placement groove 24. The top of the cover plate 23 is installed with a handle 2.

[0140] Furthermore, the outside of the welding platform 1 is connected with four groups of baffles 20 through hinges. This connection mode allows the baffles 20 to be flexibly opened or closed to meet different work requirements. Limiting grooves 21 are provided on both sides of the top of the baffles 20, and L-shaped limiting plates 22 are provided inside the limiting grooves 21 where two groups of baffles 20 are close to each other. The L-shaped limiting plates 22 enable the two groups of baffles 20 to fit tightly when closed, and are positioned through the limiting grooves to prevent the baffles 20 from being accidentally opened.

[0141] A handle 1 is installed on the top of the L-shaped limit plate 22, which is convenient for the operator to manually adjust the opening and closing state of the baffle 20. The top of the back group of baffles 20 is connected to a cover plate 23 through a hinge. A placement groove 24 is opened at the bottom of the cover plate 23, and the top of the handle 1 is located inside the placement groove 24, so that the handle 1 can be placed in the placement groove 24 when not in use to avoid protrusion and cause inconvenience or damage. The placement groove 24 is much larger than the volume of the handle 1, which is convenient for the cover plate 23 to accommodate the handle 1 when it is turned over. A handle 2 is installed on the top of the cover plate 23, which is convenient for the operator to open or close the cover plate 23;

[0142] The baffle 20 and the cover plate 23 effectively prevent spatter from polluting and damaging the surrounding environment and equipment during welding. At the same time, they also provide a certain safety barrier for the operator. Since the baffle 20 and the cover plate 23 are connected by hinges, the entire welding fixture can be easily folded up when not in use, reducing the occupied space and facilitating carrying and storage.

[0143] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A frame beam assembly welding fixture, characterized in that: It comprises a welding platform (1), a frame beam assembly fixing module is installed on the top of the welding platform (1), the frame beam assembly fixing module is used to fix the frame beam assembly from the corner, side and inner side respectively, and the frame beam assembly fixing module comprises a corner fixing component, a side fixing component and an inner side fixing component; The corner fixing assembly comprises a fixing plate 1 (2) symmetrically mounted on the top of the welding platform (1), an electric telescopic rod 1 (3) being mounted on one side of the fixing plate 1 (2), and a corner positioning block (4) being mounted on the output end of the electric telescopic rod 1 (3); The side fixing assembly comprises two sets of fixing plates (5) symmetrically mounted on the top of the welding platform (1), electric telescopic rods (6) are mounted on surfaces of the two sets of fixing plates (5) close to each other, and side positioning blocks (7) are mounted on output ends of the electric telescopic rods (6); The inner fixing assembly comprises a fixing plate three (8) mounted at the center of the top of the welding platform (1), symmetrically arranged electric telescopic rods three (9) are mounted on the outer side of the fixing plate three (8), and an inner positioning block (10) is mounted on the output end of the electric telescopic rod three (9).

2. The frame beam assembly welding fixture according to claim 1, characterized in that: An automobile frame beam assembly (11) is placed between the corner positioning block (4), the side positioning block (7) and the inner positioning block (10), and the automobile frame beam assembly (11) is located on the top of the welding platform (1).

3. The frame beam assembly welding fixture according to claim 1, characterized in that: An infrared distance measuring sensor (12) is embedded in the mutually adjacent surfaces of the second fixing plate (5), and the infrared distance measuring sensor (12) is used to detect the distance between the second fixing plate (5) and the automobile frame beam assembly (11), and the output end of the infrared distance measuring sensor (12) is connected to a controller.

4. The frame beam assembly welding fixture according to claim 1, characterized in that: The fixing plate 3 (8) is provided with symmetrically arranged mounting grooves (13) inside, and two sets of symmetrically arranged sliding rods (14) are installed inside the mounting grooves (13); A symmetrically arranged servo motor is mounted on the top of the fixing plate 3 (8), a ball screw (15) is mounted on the output end of the servo motor, one end of the ball screw (15) is connected to the bottom of the mounting groove (13) via a shaft, and the ball screw (15) is located between the two sets of sliding rods (14); The outer sides of the ball screw (15) and the two sets of sliding rods (14) are sleeved with a sliding block (16), one side of the sliding block (16) is installed with an electric telescopic rod four (17), the output end of the electric telescopic rod four (17) is installed with a pressing plate (18), the bottom of the pressing plate (18) is installed with a buffer pad (19), and the buffer pad (19) is located above the automobile frame beam assembly (11); The controller is electrically connected to the electric telescopic rod 1 (3), the electric telescopic rod 2 (6), the electric telescopic rod 3 (9), the servo motor and the electric telescopic rod 4 (17).

5. The frame beam assembly welding fixture according to claim 1, characterized in that: The outer side of the welding platform (1) is connected to four groups of baffles (20) via hinges, and limiting grooves (21) are provided on both sides of the top of the baffles (20), and L-shaped limiting plates (22) are arranged inside the limiting grooves (21) close to each other of the two groups of baffles (20), and a handle is installed on the top of the L-shaped limiting plate (22); The top of a group of baffles (20) on the back is connected to a cover plate (23) via a hinge, a placement groove (24) is provided at the bottom of the cover plate (23), and the top of the handle 1 is located inside the placement groove (24), and a handle 2 is installed on the top of the cover plate (23).

6. A welding method for a frame beam assembly welding fixture, applicable to a frame beam assembly welding fixture as claimed in any one of claims 1 to 4, characterized in that: The welding method of the frame beam assembly welding fixture is as follows: S1, mechanically cleaning and chemically cleaning the automobile frame beam assembly (11); S2, placing the automobile frame beam assembly (11) on the welding platform (1) for semi-automatic arc welding; S3, monitor the welding process through the intelligent welding monitoring system; S4. After welding is completed, the surface of the automobile frame beam assembly (11) is cleaned; S5. After cleaning, the weld is inspected for quality, including appearance inspection and non-destructive testing; S6. Record the test results, including the location, shape, size, quantity and corresponding defects of the magnetic marks, issue a test report, and grind and paint the weld according to the test report; In S1, the following is also included: S11. First, use a clean cloth to wipe the large impurities on the surface of the automobile frame beam assembly (11), then use a fine wire brush to further brush away the large impurities along the texture, then use a grinder to perform preliminary grinding to remove large scale, rust and oil stains, and use a fine wire brush to grind the grooves and holes, then use a clean cloth and compressed air to clean the grinding chips and dust remaining on the surface; S12, completely immerse the area of ​​the automobile frame beam assembly (11) that needs to be cleaned in the degreasing liquid, let it stand for 30 minutes, then take it out, rinse it thoroughly with clean water, wipe the automobile frame beam assembly (11) dry with a clean cloth, and then blow it dry with compressed air; In S2, it also includes the following: S21, placing the automobile frame beam assembly (11) on the top of the welding platform (1), detecting the distance between the second fixing plate (5) and the automobile frame beam assembly (11) by means of an infrared distance measuring sensor (12), and transmitting the detection information to the controller; S22, controlling the electric telescopic rod 1 (3), the electric telescopic rod 2 (6), the electric telescopic rod 3 (9) and the electric telescopic rod 4 (17) through a controller to drive the corner positioning block (4), the side positioning block (7), the inner positioning block (10), the pressure plate (18) and the buffer pad (19) to position the automobile frame beam assembly (11), and after the automobile frame beam assembly (11) is fixed, semi-automatic arc welding is used for welding.

7. The welding method of the frame beam assembly welding fixture according to claim 6 is characterized in that: In S3, it also includes the following: S31. The intelligent welding monitoring system includes a weld uniformity detection module, a weld straightness detection module, and a comprehensive evaluation and feedback module. The weld uniformity detection module and the weld straightness detection module are used to detect the uniformity and straightness of the automobile frame beam assembly during welding, respectively. The comprehensive evaluation and feedback is used to perform welding evaluation and adjustment according to the detection results. S32, the weld uniformity detection module includes a welding parameter monitoring submodule and a visual detection submodule. The welding parameter monitoring submodule monitors the current and voltage in the welding process in real time through a current sensor and a voltage sensor. The visual detection submodule takes a weld image through a high-definition camera and analyzes the image using image processing technology. S33, the weld straightness detection module includes a laser measurement submodule and an image processing submodule, the laser measurement submodule measures the weld trajectory by emitting a laser beam and receiving its reflected light, and the image processing submodule receives data from the laser measurement submodule and further analyzes the weld image using image processing technology; S34. The comprehensive evaluation and feedback module includes a data analysis submodule and a feedback and adjustment submodule. The data analysis submodule evaluates the welding quality by conducting an in-depth analysis of the data on weld uniformity and straightness. The feedback and adjustment submodule provides feedback to operators and quality control personnel based on the results of the data analysis submodule.

8. The welding method of the frame beam assembly welding fixture according to claim 6 is characterized in that: In S4, it also includes the following: S41. Use a fine steel wire brush to gently scrub the surface of the automobile frame beam assembly (11) along the direction of the weld to remove spatter and loose slag on the surface. Then use a grinder to grind and remove slag and impurities on the weld surface.

9. The welding method of the frame beam assembly welding fixture according to claim 6, characterized in that: In S5, the following are also included: S51. First, use a magnifying glass to visually inspect the weld surface. Wear protective gloves and touch the weld surface for tactile inspection. If the surface of the automobile frame beam assembly (11) is rough and granular, use a fine wire brush and a grinder to further clean it. S52. Perform a cleanliness test. Use a clean white cotton cloth to wipe the weld surface and observe whether there are any black-gray stains attached to the cloth. If there are no stains on the cloth, no secondary cleaning is required. If there are stains on the cloth, secondary cleaning is required. S53. Perform nondestructive testing on the automobile frame beam assembly (11) by magnetic particle inspection. Apply a magnetic field to the weld of the automobile frame beam assembly (11) and its surrounding area to cause local distortion of magnetic lines of force on the surface and near the surface of the automobile frame beam assembly (11) to form a leakage magnetic field. While applying the magnetic field, evenly spray magnetic powder on the weld surface to observe magnetic traces formed on the weld surface.

10. The welding method of the frame beam assembly welding fixture according to claim 6, characterized in that: Magnetic particle testing includes axial current method, center conductor method and ring cable winding method; The axial current method is used to detect longitudinal defects parallel to the current direction, including longitudinal fillet welds and longitudinal portions of T-shaped welds on an automobile frame beam assembly (11); The positive center conductor method is used to detect longitudinal defects parallel to the current on the inner and outer surfaces of tubular automobile frame beam assemblies (11) and radial defects with the magnetized conductor as the center; The ring-shaped cable winding method is used to detect defects in the circumferential direction and defects perpendicular to the circumferential direction of a ring-shaped automobile frame beam assembly (11).

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