Biaxial weld fatigue test device

Abstract

The invention relates to a weld joint fatigue test device, in particular to a double-shaft weld joint fatigue test device which comprises a clamping assembly used for clamping an exhaust pipe and arranged on a base. The longitudinal axis test assembly is mounted on the base, and a height adjusting assembly is arranged between the longitudinal axis test assembly and the base; and the transverse shaft test assembly is installed on the base, and the transverse shaft test assembly is located on the side edge of the clamping assembly. According to the invention, the fatigue strength of the automobile exhaust pipe can be rapidly tested and detected, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a weld fatigue test device, and more particularly to a biaxial weld fatigue test device. Background Art

[0002] The fatigue failure of welded joints is one of the main forms of structural failure, and its fatigue resistance is affected by many factors such as macroscopic and microscopic geometries, residual stresses, dynamic stresses, and mean stresses.

[0003] The exhaust pipe is an important component of an automobile, and the quality of its welds is directly related to the sealing performance, durability, and fatigue resistance of the exhaust system. The welds of automobile exhaust pipes are prone to fatigue fracture due to engine vibration, thermal cycling, and road surface impact loads. Through fatigue tests, the potential failure risks of the welds can be identified in advance, avoiding exhaust pipe leakage or fracture caused by weld fatigue, thus ensuring the safe operation of the automobile. At the same time, the design and performance of the exhaust pipe can be quickly verified, reducing rework caused by design defects, shortening the vehicle model development cycle, and reducing development costs. Currently, the commonly used methods for fatigue detection of automobile exhaust pipes include the combination of road spectrum acquisition and fatigue bench tests, non-destructive testing, etc. When using the combination of road spectrum acquisition and fatigue bench tests, the test process is complex, requiring a large amount of preparatory work in advance, and the test equipment and environment have high requirements, resulting in high test costs. If non-destructive testing is used, the fatigue strength and life of the welds cannot be directly measured, and only indirect evaluation can be performed, leading to deviations in test data.

[0004] Therefore, those skilled in the art are committed to developing a biaxial weld fatigue test device, which is conducive to quickly testing the fatigue strength of automobile exhaust pipes and improving the detection efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a biaxial weld fatigue test device, which is conducive to quickly testing the fatigue strength of automobile exhaust pipes and improving the detection efficiency.

[0006] The technical solution of the present invention for solving the above technical problems is as follows: A biaxial weld fatigue test device, comprising a clamping assembly for clamping the exhaust pipe, and the clamping assembly is arranged on a base; a longitudinal axis test assembly installed on the base, and there is a height adjustment assembly between the longitudinal axis test assembly and the base; a transverse axis test assembly installed on the base, and the transverse axis test assembly is located on the side of the clamping assembly.

[0007] The beneficial effects of adopting this scheme are: through the synergistic effect of the longitudinal and transverse axis test assemblies, a biaxial load of vertical vibration and lateral bending moment can be simultaneously applied, effectively simulating the engine vibration and road impact coupling effects that the exhaust pipe weld actually experiences. Compared with traditional testing methods, biaxial loading makes the weld stress distribution more similar to actual working conditions. The clamping assembly can firmly clamp the exhaust pipe, ensuring that the exhaust pipe remains stable during the test, avoiding test errors caused by displacement or shaking of the exhaust pipe, and improving the accuracy and reliability of the test results. There is a height adjustment assembly between the longitudinal axis test assembly and the base, which can be adjusted in height according to exhaust pipes of different lengths and shapes, so that the device can adapt to exhaust pipes of various specifications, improving the versatility and flexibility of the device, and reducing the difficulty of adaptation when testing different exhaust pipes.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the clamping assembly includes a first clamping member and a second clamping member, the first clamping member and the second clamping member each include a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are arranged opposite to each other, and the first clamping arm and the second clamping arm are respectively installed with a first clamping block and a second clamping block, the first clamping block and the second clamping block are arranged opposite to each other and the first clamping block and the second clamping block both have a clamping groove.

[0010] The beneficial effect of adopting the above further solution is that: through the relative arrangement of the first clamping member and the second clamping member and the first clamping block and the second clamping block, the exhaust pipe can be clamped more stably, ensuring that the exhaust pipe remains fixed during the multi-axial fatigue test, reducing displacement and shaking, and improving the accuracy of the test results; The clamping groove enables the clamping assembly to adapt to exhaust pipes of different diameters, thereby increasing the versatility and flexibility of the device.

[0011] Furthermore, the ends of the first clamping arm and the second clamping arm are connected with connecting blocks, and the two oppositely arranged connecting blocks are connected by connecting bolts and connecting nuts; The first clamping arm is mounted on a first support plate, and the first support plate is connected to the base via a connecting assembly.

[0012] The beneficial effect of adopting the above further solution is that the first support plate is connected to the base via the connecting assembly, which facilitates the adjustment assembly to adjust the position of the first support plate installed on the base.

[0013] Further, the connection component includes a connection plate and a locking bolt. A transverse fixing groove and a longitudinal fixing groove are provided on the base. One end of the locking bolt is engaged in the transverse fixing groove or the longitudinal fixing groove, and the other end of the locking bolt is connected to the connection plate.

[0014] The beneficial effect of adopting the above further solution is that the cooperation of the fixing groove, the locking bolt and the connection plate facilitates the quick disassembly and connection of the first support plate and the bottom plate.

[0015] Further, the longitudinal axis test component includes a longitudinal abutting block for abutting against the exhaust pipe. The longitudinal abutting block is connected with a first pressure sensor. The first pressure sensor is installed at the output end of a first servo cylinder, and the first servo cylinder is installed in the installation cabinet.

[0016] The beneficial effect of adopting the above further solution is that the combination of the longitudinal abutting block and the first pressure sensor can accurately measure the longitudinal load applied to the exhaust pipe, ensuring the accuracy and consistency of the load; Both the first pressure sensor and the first servo cylinder are electrically connected to the control component, which is beneficial to jointly judge and apply the longitudinal load through the first pressure sensor and the first servo cylinder.

[0017] Further, the first pressure sensor is a high-frequency piezoelectric pressure sensor.

[0018] The beneficial effect of adopting the above further solution is that the high-frequency piezoelectric pressure sensor has a high response speed and high precision, can capture rapidly changing loads, provide more accurate test data, and the high-frequency piezoelectric pressure sensor will quickly generate high temperature and transfer it to the weld, simulating the instantaneous high temperature generated when the vehicle starts and the continuous high temperature generated by the exhaust gas.

[0019] Further, the height adjustment component includes a lifting screw rod. One end of the lifting screw rod is connected to the base. A screw rod bearing is sleeved outside the lifting screw rod. The outer ring of the screw rod bearing is connected to the installation cabinet, and the inner ring of the screw rod bearing is also connected with a driving motor. The driving motor drives the inner ring of the screw rod bearing to rotate so that the installation cabinet moves along the axial direction of the lifting screw rod.

[0020] The beneficial effect of adopting the above further solution is that the combination of the lifting screw rod and the screw rod bearing, combined with the driving motor, can accurately control the height of the installation cabinet, ensuring the accurate position of the application of the longitudinal load.

[0021] Further, the transverse axis test component includes a transverse abutting block. The transverse abutting block is horizontally arranged. The transverse abutting block is connected with a second pressure sensor. The second pressure sensor is connected with a second servo cylinder. The second servo cylinder is connected to the base through an adjustment component.

[0022] The beneficial effects of adopting the above further solution are as follows: The combination of the lateral abutting block and the second pressure sensor can accurately apply and measure the lateral load, simulate the multi-directional stress in the actual working condition, and make the test more comprehensive; Both the first pressure sensor and the first servo cylinder are electrically connected to the control component, which is beneficial to jointly judge and apply the lateral load through the first pressure sensor and the first servo cylinder.

[0023] Further, the adjusting component includes a moving plate. The second servo cylinder is connected to the moving plate. A slider is connected to the side of the moving plate. A guide rail is arranged inside the slider. The guide rail is installed on the second support plate. A servo motor is installed at the upper end of the second support plate. The output of the servo motor is connected to a rotating lead screw. A lifting lead screw bearing is sleeved outside the rotating lead screw. The lifting lead screw bearing is installed on the moving plate. A strip-shaped groove for the up and down movement of the end of the second servo cylinder is arranged on the second support plate; The second support plate is installed on the bottom plate. The bottom plate is connected to the base through a connecting component.

[0024] The beneficial effects of adopting the above further solution are as follows: The combination of the servo motor and the rotating lead screw, in cooperation with the lifting lead screw bearing, can accurately control the vertical position of the second servo cylinder and ensure the accuracy of the application of the lateral load.

[0025] Further, the second pressure sensor is a resonant pressure sensor.

[0026] The beneficial effects of adopting the above further solution are as follows: The resonant pressure sensor has high precision and good stability, and can provide reliable lateral load measurement data; Moreover, the resonant pressure sensor can spontaneously generate high-frequency vibrations and transmit the vibrations to the weld to simulate the vibrations generated by the engine when the exhaust pipe is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a biaxial weld fatigue test device according to a specific embodiment of the present invention; Figure 2 It is a schematic structural diagram of a clamping component according to a specific embodiment of the present invention; Figure 3 It is a front view structural schematic diagram of a horizontal axis test component according to a specific embodiment of the present invention; Figure 4 It is a rear view structural schematic diagram of a horizontal axis test component according to a specific embodiment of the present invention.

[0028] In the drawings, the list of components represented by each reference numeral is as follows: 1. Clamping assembly; 2. Base; 3. Longitudinal axis test assembly; 4. Height adjustment assembly; 5. Transverse axis test assembly; 6. First clamping member; 7. Second clamping member; 8. First clamping arm; 9. Second clamping arm; 10. First clamping block; 11. Second clamping block; 12. First support plate; 13. Connecting plate; 14. Locking bolt; 15. Transverse fixing groove; 16. Longitudinal fixing groove; 17. Longitudinal abutting block; 18. First pressure sensor; 19. Lifting screw rod; 20. Installation cabinet; 21. Transverse abutting block; 22. Second pressure sensor; 23. Second servo electric cylinder; 24. Moving plate; 25. Slide block; 26. Guide rail; 27. Second support plate; 28. Servo motor; 29. Rotating screw rod; 30. Lifting screw rod bearing; 31. Base plate; 32. Connecting block; 33. Strip-shaped groove. Detailed implementation manners

[0029] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0032] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Embodiment 1

[0033] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, a biaxial weld fatigue test device includes The clamping assembly 1 is used to clamp the exhaust pipe, and the clamping assembly 1 is arranged on the base 2; The longitudinal axis test assembly 3 is installed on the base 2, and there is a height adjustment assembly 4 between the longitudinal axis test assembly 3 and the base 2. The base 2 provides a stable support platform for the entire device.

[0034] The transverse axis test assembly 5 is installed on the base 2, and the transverse axis test assembly 5 is located on the side of the clamping assembly 1.

[0035] In the present invention, through the synergistic effect of the longitudinal axis test assembly 3 and the transverse axis test assembly 5, a biaxial load of vertical vibration + lateral bending moment can be applied simultaneously, effectively simulating the engine vibration - road surface impact coupling effect actually borne by the exhaust pipe weld. Compared with the traditional test method, the biaxial loading makes the weld stress distribution closer to the real working condition.

[0036] Such as Figure 1 、 Figure 2 As shown, in some embodiments, the clamping assembly 1 includes a first clamping member 6 and a second clamping member 7. Both the first clamping member 6 and the second clamping member 7 include a first clamping arm 8 and a second clamping arm 9. The first clamping arm 8 and the second clamping arm 9 are arranged oppositely and form an ellipse after being connected in cooperation. A first clamping block 10 and a second clamping block 11 are respectively installed on the first clamping arm 8 and the second clamping arm 9. A clamping groove is arranged on the clamping block. After the clamping arm is clamped in the clamping groove, it is locked by screws. The first clamping block 10 and the second clamping block 11 are arranged oppositely and both have clamping grooves on the first clamping block 10 and the second clamping block 11. The clamping grooves are V-shaped and are used to adapt to exhaust pipes of different diameters to ensure the stability and reliability of clamping.

[0037] Such as Figure 2 As shown, in order to adjust the distance between the first clamping arm 8 and the second clamping arm 9 to further adapt to exhaust pipes of different diameters, connecting blocks 32 are connected to the ends of the first clamping arm 8 and the second clamping arm 9. The two oppositely arranged connecting blocks 32 are connected by connecting bolts and connecting nuts. The two oppositely arranged connecting blocks 32 are connected by connecting bolts and connecting nuts, which also facilitates the assembly and disassembly of the first clamping arm 8 and the second clamping arm 9. The first clamping arm 8 is installed on the first support plate 12, and the first support plate 12 is connected to the base 2 through a connecting component.

[0038] Specifically, the connecting component includes a connecting plate 13 and a locking bolt 14. The connecting plate 13 is provided with a strip-shaped connecting groove. The base 2 is provided with a transverse fixing groove 15 and a longitudinal fixing groove 16. One end of the locking bolt 14 is clamped and connected in the transverse fixing groove 15 or the longitudinal fixing groove 16, and the other end of the locking bolt 14 is connected to the connecting plate 13, which facilitates the installation of the first support plate 12 at different positions on the base 2.

[0039] Such asFigure 1 As shown, in the embodiment, the longitudinal axis test assembly 3 includes a longitudinal abutting block 17 for abutting against the exhaust pipe. The longitudinal abutting block 17 is connected with a first pressure sensor 18. In a specific embodiment, the first pressure sensor 18 is a high-frequency piezoelectric pressure sensor. The high-frequency piezoelectric pressure sensor will rapidly generate high temperature and transfer it to the weld seam, simulating the instantaneous high temperature generated when the vehicle starts and the continuous high temperature generated by the exhaust gas. The first pressure sensor 18 is installed at the output end of the first servo cylinder. The first servo cylinder is installed in the installation cabinet 20. Both the first pressure sensor 18 and the first servo cylinder are electrically connected to a control assembly (not shown in the figure), which is conducive to jointly judging and applying longitudinal load through the first pressure sensor 18 and the first servo cylinder.

[0040] In the embodiment, the height adjustment assembly 4 includes a lifting lead screw 19. One end of the lifting lead screw 19 is connected to the base 2. A lead screw bearing is sleeved outside the lifting lead screw 19. The outer ring of the lead screw bearing is connected to the installation cabinet 20. The inner ring of the lead screw bearing is also connected with a driving motor. The driving motor drives the inner ring of the lead screw bearing to rotate, so that the installation cabinet 20 moves along the axial direction of the lifting lead screw 19, thereby realizing precise adjustment of the heights of the first pressure sensor 18 and the longitudinal abutting block 17.

[0041] As Figure 1 、 Figure 3 and Figure 4 shown, the transverse axis test assembly 5 is installed on the base 2, on the side of the clamping assembly 1, and is used to apply a transverse load. The transverse axis test assembly 5 includes a transverse abutting block 21. The transverse abutting block 21 is horizontally arranged and can apply a transverse load evenly. The transverse abutting block 21 is connected with a second pressure sensor 22. The second pressure sensor 22 is a resonant pressure sensor. The resonant pressure sensor can spontaneously generate high-frequency vibration and transfer the vibration to the weld seam to simulate the vibration generated by the engine when the exhaust pipe is working. The second pressure sensor 22 is connected with a second servo cylinder 23. The second servo cylinder 23 is connected to the base 2 through an adjustment assembly. Both the second pressure sensor 22 and the second servo cylinder 23 are electrically connected to the control assembly, which is conducive to jointly judging and applying a transverse load through the second pressure sensor 22 and the second servo cylinder 23.

[0042] The adjustment component includes a moving plate 24. The second servo cylinder 23 is connected to the moving plate 24. A slider 25 is connected to the side of the moving plate 24. A guide rail 26 is arranged inside the slider 25. The guide rail 26 is installed on the second support plate 27. A servo motor 28 is installed at the upper end of the second support plate 27. The output of the servo motor 28 is connected to a rotating lead screw 29. A lifting lead screw bearing 30 is sleeved outside the rotating lead screw 29. The lifting lead screw bearing 30 is installed on the moving plate 24. Driven by the servo motor 28, the rotating lead screw 29 can drive the moving plate 24 to move along the guide rail 26 to adjust the height of the output end of the second servo cylinder 23. A strip-shaped groove 33 for the up-and-down movement of the end of the second servo cylinder 23 is arranged on the second support plate 27 to allow the end of the second servo cylinder 23 to move in the up-and-down direction. The second support plate 27 is installed on the bottom plate 31. The bottom plate 31 is connected to the base 2 through a connecting component to ensure the stability and flexibility of the entire horizontal axis test component 5.

[0043] In the present invention, the high-frequency piezoelectric pressure sensor and the resonant pressure sensor work together. By controlling the component to precisely control the application of the load, the complex working conditions of the exhaust pipe in the actual working environment are simulated. The high-frequency piezoelectric pressure sensor can quickly generate high temperature to simulate the instantaneous high temperature when the vehicle starts and the continuous high temperature generated by the exhaust gas. The resonant pressure sensor can spontaneously generate high-frequency vibration to simulate the engine vibration received by the exhaust pipe during operation. This synergistic effect enables the test device to more realistically simulate the multi-axis load borne by the exhaust pipe weld in the actual working conditions, improving the accuracy and reliability of the test. Through this simulation, the fatigue strength of the exhaust pipe weld can be detected more effectively, potential failure risks can be identified in advance, and the reliability and safety of the vehicle exhaust pipe can be ensured. Embodiment 2

[0044] The difference between Embodiment 2 and Embodiment 1 is only that through the multi-physical field coupling loading technology, the vibration, high temperature and alternating stress environment of the exhaust pipe weld under the real working conditions are simulated. The following is the description of the specific structural optimization and working principle: Vertical axis high-temperature vibration loading module: The longitudinal abutting block 17 of the vertical axis test component 3 is internally provided with a PZT piezoelectric ceramic sensor with a response frequency exceeding 10 kHz, which can apply a vertical dynamic load through the first servo cylinder. The load amplitude is between ±500 N, and the frequency range is 10 Hz - 200 Hz, which can simulate the impact during engine cold start and the vibration during idle state. In order to simulate the continuous high-temperature environment of the exhaust pipe exhaust gas, an induction heating coil is embedded in the V-shaped clamping groove of the clamping component 1, with a maximum temperature of up to 800 °C, and closed-loop control is achieved through an infrared temperature sensor. At the same time, a aluminum nitride film heat dissipation layer is coated on the surface of the high-frequency piezoelectric sensor, and a circulating water cooling channel is integrated. The cooling medium is high-temperature silicone oil, effectively suppressing the performance attenuation of the piezoelectric material at high temperature.

[0045] Horizontal Axis High-Frequency Vibration Coupling Module: The lateral abutting block 21 of the horizontal axis test assembly 5 uses a quartz crystal resonant pressure sensor to detect lateral alternating bending moment based on the offset of the natural frequency. The amplitude is between ±300 N, the frequency range is 5 Hz - 50 Hz, the sensitivity reaches 0.1 N, and the phase synchronization error is less than 5°. By driving the combination of the rotating lead screw and the slider guide rail with a servo motor, the dynamic adjustment of the lateral abutting block 21 in the vertical direction of ±10 mm is realized, which can avoid the interference of local bosses or welded stiffeners on the exhaust pipe, and at the same time support thermal expansion compensation, and the displacement accuracy can reach ±0.05 mm at high temperatures.

[0046] Intelligent Control and Monitoring System: The control software developed based on the LabVIEW platform can synchronously collect the charge signal (dynamic strain) of the piezoelectric sensor and the frequency signal (static stress) of the resonant sensor to generate a weld stress nephogram under biaxial load, and the grid accuracy is 0.1 mm². By using digital twin technology to compare the test data with the ANSYS thermal-mechanical coupling simulation results in real time, the load parameters are dynamically adjusted, and the response time is less than 10 ms. In addition, a micro scanning electron microscope (SEM) probe is integrated on the side of the test bench to capture the initiation and propagation of microcracks on the weld surface in real time, and the resolution reaches 1 μm. Combining the rain flow counting method to statistically analyze the crack growth rate (da / dN), and when the crack length exceeds 2 mm, the automatic shutdown protection is triggered.

[0047] Working Principle: During the process of coupled loading of biaxial load and high temperature, at startup, the high-frequency piezoelectric sensor applies a vertical impact load through a servo cylinder, with a peak value of 500 N and a pulse width of 5 ms. At the same time, the heating coil heats up to 600 °C to simulate the instantaneous vibration and exhaust gas high temperature during engine startup. The horizontal axis resonant sensor is synchronously activated to apply a lateral alternating bending moment with a frequency of 50 Hz, and the frequency offset of the quartz crystal is used to real-time feedback the load phase to ensure the coordination of the biaxial stress ratio.

[0048] In terms of dynamic damage assessment and life prediction, the dynamic stress is calculated based on the piezoelectric effect formula Q = d×F, combined with the stress-frequency mapping relationship of the resonant sensor, and the S-N curve under biaxial load is output, and the fatigue life prediction error is less than 8%. By analyzing the crack propagation path and rate with AI algorithm, the weak areas of the weld are identified, such as porosity defects in the heat affected zone, so as to guide the process optimization and reduce the scrap rate by 30%.

[0049] Through the above optimizations and integrations, the biaxial weld fatigue test device of the second embodiment can more realistically simulate the complex stress environment of the exhaust pipe weld under actual working conditions, improve the accuracy and reliability of the test, and provide strong support for the design optimization and performance evaluation of the exhaust pipe.

[0050] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A biaxial weld fatigue test device, characterized in that: including a clamping assembly (1) for clamping an exhaust pipe, the clamping assembly (1) being arranged on a base (2); a longitudinal axis test assembly (3) installed on the base (2), and a height adjustment assembly (4) being provided between the longitudinal axis test assembly (3) and the base (2); a transverse axis test assembly (5) installed on the base (2), the transverse axis test assembly (5) being located beside the clamping assembly (1).

2. The biaxial weld fatigue test device according to claim 1, characterized in that: The clamping assembly (1) includes a first clamping member (6) and a second clamping member (7), both the first clamping member (6) and the second clamping member (7) include a first clamping arm (8) and a second clamping arm (9), the first clamping arm (8) and the second clamping arm (9) are arranged oppositely, first clamping blocks (10) and second clamping blocks (11) are respectively installed on the first clamping arm (8) and the second clamping arm (9), the first clamping blocks (10) and the second clamping blocks (11) are arranged oppositely and clamping grooves are provided on both the first clamping blocks (10) and the second clamping blocks (11).

3. The biaxial weld fatigue test device according to claim 2, wherein: Connection blocks (32) are connected to the ends of the first clamping arm (8) and the second clamping arm (9), and the two oppositely arranged connection blocks (32) are connected by connection bolts and connection nuts; The first clamping arm (8) is installed on a first support plate (12), and the first support plate (12) is connected to the base (2) through a connection assembly.

4. The biaxial weld fatigue test device according to claim 3, characterized in that: The connection assembly includes a connection plate (13) and a locking bolt (14), a transverse fixing groove (15) and a longitudinal fixing groove (16) are provided on the base (2), one end of the locking bolt (14) is in snap connection with the transverse fixing groove (15) or the longitudinal fixing groove (16), and the other end of the locking bolt (14) is connected to the connection plate (13).

5. The biaxial weld fatigue test device according to claim 1, characterized in that: The longitudinal axis test assembly (3) includes a longitudinal abutting block (17) for abutting against the exhaust pipe, the longitudinal abutting block (17) is connected with a first pressure sensor (18), the first pressure sensor (18) is installed at the output end of a first servo cylinder, and the first servo cylinder is installed in an installation cabinet (20).

6. The biaxial weld fatigue test device according to claim 5, wherein: The first pressure sensor (18) is a high-frequency piezoelectric pressure sensor.

7. The biaxial weld fatigue test device according to claim 5, wherein: The height adjustment assembly (4) includes a lifting lead screw (19), one end of the lifting lead screw (19) is connected to the base (2), a lead screw bearing is sleeved outside the lifting lead screw (19), the outer ring of the lead screw bearing is connected to the installation cabinet (20), and a driving motor is further connected to the inner ring of the lead screw bearing, and the driving motor drives the inner ring of the lead screw bearing to rotate so that the installation cabinet (20) moves along the axial direction of the lifting lead screw (19).

8. The biaxial weld fatigue test device according to claim 1, characterized in that: The horizontal axis test assembly (5) includes a lateral abutting block (21), the lateral abutting block (21) is horizontally arranged, the lateral abutting block (21) is connected with a second pressure sensor (22), the second pressure sensor (22) is connected with a second servo cylinder (23), and the second servo cylinder (23) is connected with the base through an adjusting assembly.

9. The biaxial weld fatigue test device according to claim 8, wherein: The adjusting assembly includes a moving plate (24), the second servo cylinder (23) is connected with the moving plate (24), a slider (25) is connected to the side of the moving plate (24), a guide rail (26) is arranged inside the slider (25), the guide rail (26) is installed on a second support plate (27), a servo motor (28) is installed at the upper end of the second support plate (27), the output of the servo motor (28) is connected with a rotating lead screw (29), a lifting lead screw bearing (30) is sleeved outside the rotating lead screw (29), the lifting lead screw bearing (30) is installed on the moving plate (24), and a strip-shaped groove (33) for the up and down movement of the end of the second servo cylinder (23) is arranged on the second support plate (27); The second support plate (27) is installed on a bottom plate (31), and the bottom plate (31) is connected with the base (2) through a connecting assembly.

10. The biaxial weld fatigue test device according to claim 8, characterized in that: The second pressure sensor (22) is a resonant pressure sensor.

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