Dynamic hydrogen charging stretching and acoustic emission testing device for welded joint

Abstract

The utility model relates to a dynamic hydrogen charging stretching and acoustic emission testing device for a welded joint, which belongs to the technical field of a detection device for a stretching process of the welded joint in a hydrogen environment and comprises a box body, a hydrogen permeation system, a loading system, an acoustic emission system and a control system, the hydrogen permeation system, the loading system, the acoustic emission system and the control system are all fixed on the box body, and the control system is electrically connected with the hydrogen permeation system, the loading system and the acoustic emission system respectively. The device is good in sealing performance, is suitable for a dynamic hydrogen filling slow stretching system in which hydrogen filling processes under different hydrogen concentration conditions are coupled with a welding joint slow-rate stretching process, and analyzes stress, strain and energy change rules of a hydrogen embrittlement damage area by detecting the dynamic hydrogen embrittlement damage process; the influence rule of hydrogen embrittlement damage of the welding joint in the hydrogen working environment on energy release and elastic fluctuation is disclosed, so that basic data and guidance are provided for design and safety management of the welding joint in the hydrogen working environment.

Description

Technical Field

[0001] The utility model relates to the technical field of a welding joint hydrogen environment stretching process detection device, in particular to a welding joint dynamic hydrogen filling stretching and acoustic emission testing device. Background Art

[0002] Hydrogen is the first element in the periodic table, so hydrogen atoms have the smallest volume and can penetrate into various materials. Hydrogen in metals is a harmful and unavoidable impurity element. Hydrogen atoms will enter metal materials during the material preparation and service process, which will reduce the toughness of the metal. In severe cases, it will cause brittle fracture of the material, "hydrogen embrittlement", and cause sudden and vicious damage accidents.

[0003] Hydrogen embrittlement in metals can be divided into the first type of hydrogen embrittlement and the second type of hydrogen embrittlement according to the way of forming crack sources and the changing trend of hydrogen embrittlement sensitivity. The first type of hydrogen embrittlement refers to the presence of hydrogen embrittlement fracture sources inside the material before the metal material is loaded, such as white spots, hydrogen corrosion or hydride embrittlement. The first type of hydrogen embrittlement fracture source quickly forms cracks and expands under stress, and the sensitivity of hydrogen embrittlement increases with the increase of loading strain rate, because the existing damage will expand faster under higher stress. The second type of hydrogen embrittlement refers to the absence of fracture sources inside the material before the metal material is loaded, and the fracture sources are gradually formed under the interaction of hydrogen and stress during the loading process. The sensitivity of the second type of hydrogen embrittlement decreases with the increase of loading strain rate, because the hydrogen embrittlement source is gradually formed under lower stress. In practical applications, the first type of hydrogen embrittlement is usually related to internal damage of the material, while the second type of hydrogen embrittlement is related to the damage formed by the interaction between the material and stress under specific conditions (such as hydrogen in the service environment). Therefore, in order to ensure the safety of metal materials during use, it is necessary to study the hydrogen embrittlement sensitivity of metal materials with different hydrogen contents under laboratory conditions.

[0004] The presence of residual stress in metal welded joints will lead to hydrogen enrichment in the weld area, especially in hydrogen working environments, which is prone to hydrogen embrittlement failure. Once hydrogen embrittlement occurs, it cannot be eliminated, and there is often no warning before hydrogen embrittlement fracture. Therefore, once hydrogen embrittlement failure occurs, it will cause extremely serious consequences. It is necessary to study the hydrogen embrittlement problem of metal welded joints.

[0005] At present, there are mainly the following methods for pre-charging hydrogen in metal welding joints under laboratory conditions: room temperature gas phase hydrogenation, high temperature and high pressure hydrogenation, and electrochemical hydrogenation. Room temperature gas phase hydrogenation is to place the welding joint directly in room temperature high purity hydrogen for hydrogenation. Even if a very high hydrogen pressure is used, the hydrogen content that can enter the material is very low; high temperature and high pressure hydrogenation is to place the welding joint in an autoclave in a high temperature and high pressure environment for hydrogenation. Usually, laboratories do not have such experimental conditions and there are certain safety hazards; conventional electrochemical hydrogenation uses the welding joint as the cathode and the platinum electrode as the anode, and uses the cathode effect of the electrolysis process to allow hydrogen to enter the metal. This method is simple to operate, has little safety hazard, and is low in cost. A higher hydrogen concentration can be obtained by controlling the current density. A common feature of the three pre-charging hydrogenation methods is that after the hydrogenation is completed, the welding joint is taken out for formal testing. This process takes a certain amount of time. At this time, a large amount of hydrogen will escape from the welding joint, causing the hydrogen concentration inside the welding joint to change.

[0006] Acoustic emission detection technology is one of the mechanical damage detection technologies for metal materials. As a dynamic detection technology, the acoustic emission signal obtained during the monitoring process can directly reflect the induction, generation and development of internal defects of the material. It has the advantages of being dynamic, real-time and highly sensitive, and can determine the mode and degree of tensile damage.

[0007] Therefore, how to design a dynamic hydrogen filling stretching and acoustic emission testing device for welded joints is an urgent problem that technicians in this field need to solve. Utility Model Content

[0008] The present invention aims to solve the deficiencies of the prior art, and proposes a welding joint dynamic hydrogen filling stretching and acoustic emission test device and test method, so as to broaden the application of acoustic emission technology in hydrogen embrittlement damage detection.

[0009] The utility model solves the above technical problems with the following technical solutions: a welding joint dynamic hydrogen filling stretching and acoustic emission testing device, wherein the welding joint is sequentially divided into an upper transition section, a gauge section and a lower transition section along its length direction, and the middle of the gauge section has a welding seam; the device comprises: a box, a hydrogen permeation system, a loading system, an acoustic emission system and a control system,

[0010] The top surface of the box body is provided with a power-on hole and an upper through hole at intervals, and the bottom surface thereof is provided with a lower through hole opposite to the upper through hole; the lower transition section slides out of the lower through hole; the hydrogen permeation system comprises a hydrogen-containing electrolyte solution and an electrode, the electrolyte solution is filled in the box body; the electrode is inserted and fixed in the power-on hole, and its bottom end is electrically connected to the electrolyte solution; the loading system comprises an upper chuck, an upper connector, a lower chuck, a lower connector and a stretching machine, the upper chuck is located in the box body and clamped on the upper transition section; the bottom end of the upper connector is fixed on the upper chuck, and its top end movably extends out of the upper through hole; the lower chuck The head is clamped on the protruding end of the lower transition section extending out of the lower through hole; the lower connecting body is fixed on the lower clamp; the two stretching ends of the stretching machine are detachably connected to the upper connecting body and the lower connecting body respectively; the acoustic emission system includes a clamp, an acoustic emission sensor and an acoustic emission instrument, the clamp is clamped on the section wall of the lower transition section extending out of the lower through hole; the acoustic emission sensor is fixed on the clamp and contacts with the section wall of the lower transition section extending out of the lower through hole; the acoustic emission instrument is electrically connected to the acoustic emission sensor; the control system is electrically connected to the electrode, the stretching machine and the acoustic emission instrument respectively.

[0011] The beneficial effects of the utility model are: good sealing performance, suitable for a dynamic hydrogen charging and slow stretching system coupled with a hydrogen charging process under different hydrogen concentration conditions and a slow rate stretching process of a welded joint, by detecting the dynamic hydrogen embrittlement damage process, analyzing the stress, strain and energy variation law in the hydrogen embrittlement damage area, revealing the influence of hydrogen embrittlement damage of welded joints in a hydrogen working environment on energy release and elastic fluctuation, thereby providing basic data and guidance for the design and safety management of welded joints in a hydrogen working environment.

[0012] Description of the experimental process: Add electrolyte solution into the box, determine the current density a according to the gauge length h, width b, thickness d and test requirements, and then determine the hydrogen charging current I; input the plate-shaped tensile weld joint parameters to control the stretching machine to perform slow strain rate stretching on the plate-shaped tensile weld joint, and use a DC regulated power supply to energize the plate-shaped tensile weld joint and the auxiliary electrode to perform an electrochemical hydrogen charging test, and set the threshold voltage according to the noise of the fixture when the stretching machine is running and the electrochemical noise when the weld joint is energized, perform acoustic emission signal detection on the tensile weld joint, and observe the temperature and pressure inside the closed box at the same time; finally, the dynamic hydrogen charging, slow tensile test stress strain and acoustic emission signal data of the plate-shaped tensile weld joint are obtained through the signal acquisition, processing and control system.

[0013] Calculation formula of hydrogen charging current I:

[0014] I=h×b×d×a

[0015] Where h is the gauge length, b is the gauge width, d is the gauge thickness and a is the current density.

[0016] On the basis of the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, the control system includes a DC regulated power supply, a stretching machine control computer and an acoustic emission control computer, the electrode is electrically connected to the DC regulated power supply, the stretching machine is electrically connected to the stretching machine control computer, and the acoustic emission instrument is electrically connected to the acoustic emission control computer.

[0018] Furthermore, the control system also includes a pressure sensor and a temperature sensor. The top surface of the box body is provided with a pressure hole and a temperature hole. The pressure sensor is inserted into the pressure hole; the temperature sensor is inserted into the temperature hole; the acoustic emission control computer is electrically connected to the pressure sensor and the temperature sensor respectively.

[0019] A further beneficial effect of the above method is that the pressure and temperature inside the box can be monitored in real time by placing a pressure sensor and a temperature sensor in the pressure hole and the temperature hole respectively.

[0020] Furthermore, it also includes a sealing system, which includes an upper sealing ring and a lower sealing ring. The upper connector is fixed with a convex ring on the outer peripheral side wall corresponding to the box body; the upper sealing ring is located between the convex ring and the top surface of the box body and is sleeved on the outer peripheral side of the upper connector; the lower sealing ring is bonded to the inner bottom surface of the box body; and the lower transition section interference passes through the lower sealing ring.

[0021] A further beneficial effect of the above method is that the upper sealing ring and the lower sealing ring are respectively sleeved on the outer peripheral sides of the upper connector and the gauge section, so that the sealing of the box can be improved during the process of realizing the stretching welding joint.

[0022] Furthermore, the clamp includes a U-shaped clamp and a fastening bolt, the U-shaped clamp is clamped on the section wall of the lower transition section extending out of the lower through hole and its side wall is provided with a threaded hole; the acoustic emission sensor is located in the U-shaped clamp; the fastening bolt is screwed into the threaded hole and its screw-in end contacts the acoustic emission sensor to press the acoustic emission sensor onto the section wall of the lower transition section extending out of the lower through hole.

[0023] Furthermore, the clamp also includes a silicone pad, which is located between the acoustic emission sensor and the screw-in end of the fastening bolt, and its two end surfaces are respectively in contact with the acoustic emission sensor and the screw-in end of the fastening bolt.

[0024] A further beneficial effect of the above method is that a silicone pad is placed between the acoustic emission sensor and the screw-in end of the fastening bolt to avoid the fastening bolt from hard squeezing the acoustic emission sensor and prevent the acoustic emission sensor from being damaged.

[0025] Furthermore, it also includes an exhaust pipe, the top surface of the box body is provided with an exhaust hole; the exhaust pipe is inserted into the exhaust hole and its top end extends out of the box body, and an exhaust valve is fixed on the pipe wall of the exhaust pipe extending out of the box body.

[0026] Furthermore, it also includes a liquid adding pipe, the top surface of the box body is provided with a liquid adding hole; the liquid adding pipe is inserted into the liquid adding hole and its top end extends out of the box body, and a liquid adding valve is fixed on the pipe wall of the liquid adding pipe extending out of the box body.

[0027] Furthermore, it also includes a drain pipe, the bottom surface of the box body is provided with a drain hole; the drain pipe is inserted into the drain hole and its bottom end extends out of the box body, and a drain valve is fixed on the tube wall of the drain pipe extending out of the box body.

[0028] Furthermore, the electrolyte solution is H2SO4 solution+Na4P2O7·10H2O (hydrogen inhibitor); and the electrode is a Pt electrode.

[0029] The above further beneficial effects are: the in-situ hydrogen charging slow tensile test can effectively avoid the hydrogen escape problem during pre-charging and stretching; at the same time, the use of hydrogen inhibitor Na4P2O7·10H2O can hinder the atomic hydrogen from recombining into molecular hydrogen and promote the atomic hydrogen penetration and diffusion of the tensile welded joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the internal structure of a welding joint dynamic hydrogen filling stretching and acoustic emission testing device of the utility model;

[0031] Figure 2 This is a schematic diagram of the internal structure of a control system in a welding joint dynamic hydrogen filling stretching and acoustic emission testing device of the utility model;

[0032] Figure 3 It is a schematic diagram of the assembly structure of a fixture silicone pad and an acoustic emission sensor in a welding joint dynamic hydrogen filling stretching and acoustic emission testing device of the utility model;

[0033] Figure 4 Schematic diagram of the welded joint structure.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Box body, 11. Upper perforation, 12. Lower perforation, 2. Hydrogen permeation system, 21. Electrolyte solution, 22. Electrode, 3. Loading system, 31. Upper chuck, 32. Upper connector, 33. Lower chuck, 34. Lower connector, 35. Stretching machine, 4. Acoustic emission system, 41. Clamp, 411. U-shaped clamp, 412. Fastening bolt, 413. Silicone pad, 42. Acoustic emission sensor, 43. Acoustic emission instrument, 5. Control system, 51. DC regulated power supply, 52. Stretching machine control computer, 53. Acoustic emission control computer, 54. Pressure sensor, 55. Temperature sensor, 6. Welding joint, 61. Upper transition section, 62. Gauge section, 63. Lower transition section, 71. Upper sealing ring, 72. Lower sealing ring, 8. Exhaust pipe, 9. Liquid adding pipe, 10. Drain pipe. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] like Figure 1 As shown, a welding joint dynamic hydrogen charging stretching and acoustic emission testing device, the welding joint 6 is divided into an upper transition section 61, a gauge section 62 and a lower transition section 63 in sequence along its length direction, and the middle of the gauge section 62 has a welding seam; comprising:

[0038] The box body 1 has a power-on hole and an upper through hole 11 at intervals on the top surface thereof and a lower through hole 12 opposite to the upper through hole 11 on the bottom surface thereof; the lower transition section 63 slides out of the lower through hole 12;

[0039] The hydrogen permeation system 2 includes a hydrogen-containing electrolyte solution 21 and an electrode 22. The electrolyte solution 21 is filled in the box 1; the electrode 22 is inserted into the power-on hole and its bottom end is electrically connected to the electrolyte solution 21;

[0040] The loading system 3 includes an upper clamp 31, an upper connector 32, a lower clamp 33, a lower connector 34 and a stretching machine 35. The upper clamp 31 is located in the box 1 and clamped on the upper transition section 61; the bottom end of the upper connector 32 is fixed on the upper clamp 31 and its top end movably extends out of the upper through hole 11; the lower clamp 33 is clamped on the protruding end of the lower transition section 63 extending out of the lower through hole 12; the lower connector 34 is fixed on the lower clamp 33; the two stretching ends of the stretching machine 35 are detachably connected to the upper connector 32 and the lower connector 34 respectively;

[0041] The acoustic emission system 4 includes a fixture 41, an acoustic emission sensor 42 and an acoustic emission instrument 43. The fixture 41 is clamped on the wall of the lower transition section 63 extending out of the lower through hole 12; the acoustic emission sensor 42 is fixed on the fixture 41 and contacts the wall of the lower transition section 63 extending out of the lower through hole 12; the acoustic emission instrument 43 is electrically connected to the acoustic emission sensor 42;

[0042] The control system 5 is electrically connected to the electrode 22, the stretching machine 35 and the acoustic emission instrument 43 respectively.

[0043] In some specific embodiments, the control system 5 includes a DC regulated power supply 51, a stretching machine control computer 52 and an acoustic emission control computer 53, the electrode 22 is electrically connected to the DC regulated power supply 51, the stretching machine 35 is electrically connected to the stretching machine control computer 52, and the acoustic emission instrument 43 is electrically connected to the acoustic emission control computer 53.

[0044] In some specific embodiments, the control system 5 may further include a pressure sensor 54 and a temperature sensor 55. The top surface of the box body 1 is provided with a pressure hole and a temperature hole. The pressure sensor 54 is inserted into the pressure hole; the temperature sensor 55 is inserted into the temperature hole; and the acoustic emission control computer 53 is electrically connected to the pressure sensor 54 and the temperature sensor 55 respectively.

[0045] In some specific embodiments, a sealing system may also be included, which includes an upper sealing ring 71 and a lower sealing ring 72. A convex ring is fixed on the outer peripheral side wall of the upper connector 32 corresponding to the box body 1; the upper sealing ring 71 is located between the convex ring and the top surface of the box body 1 and is sleeved on the outer peripheral side of the upper connector 32; the lower sealing ring 72 is bonded to the inner bottom surface of the box body 1; and the lower transition section 63 passes through the lower sealing ring 72 with interference fit.

[0046] In some specific embodiments, the clamp 41 may include a U-shaped clamp 411 and a fastening bolt 412, the U-shaped clamp 411 is clamped on the section wall of the lower transition section 63 extending out of the lower through hole 12 and its side wall is provided with a threaded hole; the acoustic emission sensor 42 is located in the U-shaped clamp 411; the fastening bolt 412 is screwed into the threaded hole and its screw-in end contacts the acoustic emission sensor 42 to press the acoustic emission sensor 42 to the section wall of the lower transition section 63 extending out of the lower through hole 12.

[0047] In some specific embodiments, the clamp 41 may further include a silicone pad 413, which is located between the acoustic emission sensor 42 and the screw-in end of the fastening bolt 412, and its two end surfaces are in contact with the acoustic emission sensor 42 and the screw-in end of the fastening bolt 412 respectively.

[0048] In some specific embodiments, an exhaust pipe 8 may be further included. An exhaust hole is provided on the top surface of the box body 1. The exhaust pipe 8 is inserted into the exhaust hole and its top end extends out of the box body 1. An exhaust valve is fixed on the pipe wall of the exhaust pipe 8 extending out of the box body 1.

[0049] In some specific embodiments, a liquid adding tube 9 may be further included. A liquid adding hole is provided on the top surface of the box body 1. The liquid adding tube 9 is inserted into the liquid adding hole and its top end extends out of the box body 1. A liquid adding valve is fixed on the tube wall where the liquid adding tube 9 extends out of the box body 1.

[0050] In some specific embodiments, a drain pipe 10 may be further included. A drain hole is provided on the bottom surface of the box body 1. The drain pipe 10 is inserted into the drain hole and its bottom end extends out of the box body 1. A drain valve is fixed on the tube wall where the drain pipe 10 extends out of the box body 1.

[0051] Specifically, the electrolyte solution 21 is H2SO4 solution+Na4P2O7·10H2O (hydrogen inhibitor); and the electrode 22 is a Pt electrode.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding joint dynamic hydrogen charging tensile and acoustic emission testing device, wherein the welding joint (6) is divided into an upper transition section (61), a gauge section (62) and a lower transition section (63) in sequence along its length direction, and the middle part of the gauge section (62) has a welding seam; characterized in that: include: A box body (1), wherein a power-on hole and an upper through hole (11) are provided on the top surface of the box body (1) at intervals, and a lower through hole (12) opposite to the upper through hole (11) is provided on the bottom surface; the lower transition section (63) slides out of the lower through hole (12); A hydrogen permeation system (2), the hydrogen permeation system (2) comprising a hydrogen-containing electrolyte solution (21) and an electrode (22), the electrolyte solution (21) being filled in the box (1); the electrode (22) being inserted and fixed in the power-on hole and having its bottom end electrically connected to the electrolyte solution (21); A loading system (3), the loading system (3) comprising an upper clamp (31), an upper connector (32), a lower clamp (33), a lower connector (34) and a stretching machine (35), the upper clamp (31) being located in the box (1) and clamped on the upper transition section (61); the bottom end of the upper connector (32) being fixed on the upper clamp (31) and the top end thereof being movably extended out of the upper through hole (11); the lower clamp (33) being clamped on the protruding end of the lower transition section (63) extending out of the lower through hole (12); the lower connector (34) being fixed on the lower clamp (33); and the two stretching ends of the stretching machine (35) being detachably connected to the upper connector (32) and the lower connector (34) respectively; An acoustic emission system (4), the acoustic emission system (4) comprising a fixture (41), an acoustic emission sensor (42) and an acoustic emission instrument (43), the fixture (41) being clamped on the wall of the lower transition section (63) extending out of the lower through hole (12); the acoustic emission sensor (42) being fixed on the fixture (41) and in contact with the wall of the lower transition section (63) extending out of the lower through hole (12); and the acoustic emission instrument (43) being electrically connected to the acoustic emission sensor (42); A control system (5), wherein the control system (5) is electrically connected to the electrode (22), the stretching machine (35) and the acoustic emission instrument (43) respectively.

2. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 1, characterized in that: The control system (5) comprises a DC regulated power supply (51), a stretching machine control computer (52) and an acoustic emission control computer (53); the electrode (22) is electrically connected to the DC regulated power supply (51); the stretching machine (35) is electrically connected to the stretching machine control computer (52); and the acoustic emission instrument (43) is electrically connected to the acoustic emission control computer (53).

3. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 2, characterized in that: The control system (5) further comprises a pressure sensor (54) and a temperature sensor (55); a pressure hole and a temperature hole are provided on the top surface of the box body (1); the pressure sensor (54) is inserted into the pressure hole; the temperature sensor (55) is inserted into the temperature hole; and the acoustic emission control computer (53) is electrically connected to the pressure sensor (54) and the temperature sensor (55), respectively.

4. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 1, characterized in that: The invention also comprises a sealing system, wherein the sealing system comprises an upper sealing ring (71) and a lower sealing ring (72); a convex ring is fixed on the outer peripheral side wall of the upper connecting body (32) corresponding to the inner side wall of the box body (1); the upper sealing ring (71) is located between the convex ring and the top surface of the box body (1) and is sleeved on the outer peripheral side of the upper connecting body (32); the lower sealing ring (72) is bonded to the inner bottom surface of the box body (1); and the lower transition section (63) passes through the lower sealing ring (72) by interference fit.

5. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 1, characterized in that: The clamp (41) comprises a U-shaped clamp (411) and a fastening bolt (412); the U-shaped clamp (411) is clamped on the wall of the lower transition section (63) extending out of the lower through hole (12) and a threaded hole is provided on its side wall; the acoustic emission sensor (42) is located in the U-shaped clamp (411); the fastening bolt (412) is screwed into the threaded hole and its screwed-in end contacts the acoustic emission sensor (42) so as to press the acoustic emission sensor (42) against the wall of the lower transition section (63) extending out of the lower through hole (12).

6. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 5, characterized in that: The clamp (41) further comprises a silicone pad (413), wherein the silicone pad (413) is located between the acoustic emission sensor (42) and the screw-in end of the fastening bolt (412), and its two end surfaces are respectively in contact with the acoustic emission sensor (42) and the screw-in end of the fastening bolt (412).

7. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 1, characterized in that: It also comprises an exhaust pipe (8), the top surface of the box body (1) is provided with an exhaust hole; the exhaust pipe (8) is inserted into the exhaust hole and its top end protrudes out of the box body (1); an exhaust valve is fixed on the pipe wall of the exhaust pipe (8) protruding out of the box body (1).

8. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 1, characterized in that: It also comprises a liquid adding pipe (9), the top surface of the box body (1) is provided with a liquid adding hole; the liquid adding pipe (9) is inserted and fixed in the liquid adding hole and its top end extends out of the box body (1); a liquid adding valve is fixed on the pipe wall where the liquid adding pipe (9) extends out of the box body (1).

9. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 1, characterized in that: It also comprises a liquid discharge pipe (10), the bottom surface of the box body (1) is provided with a liquid discharge hole; the liquid discharge pipe (10) is inserted and fixed in the liquid discharge hole and its bottom end extends out of the box body (1); a liquid discharge valve is fixed on the pipe wall where the liquid discharge pipe (10) extends out of the box body (1).

10. A welding joint dynamic hydrogen filling tensile and acoustic emission testing device according to claim 1, characterized in that: The electrolyte solution (21) is H2SO4 solution+Na4P2O7·10H2O; and the electrode (22) is a Pt electrode.

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