Welding seam strength testing device

Abstract

The invention discloses a weld strength testing device which comprises a standard testing workpiece and a clamp, the standard testing workpiece comprises a first testing structure and a second testing structure, the first testing structure comprises a first clamping part extending in the first direction and a first connecting part extending in the second direction, and the first direction is perpendicular to the second direction; the second testing structure comprises a second clamping part extending in the first direction and a second connecting part extending in the second direction, the first connecting part and the second connecting part are welded to form a welding seam, the welding seam structural strength of the welding seam is related to the thickness of the first clamping part in the second direction, and the structural strength of the first testing structure is smaller than that of the second testing structure; and the width of the standard test workpiece in the second direction and the wall thickness of the original annular workpiece are closed, one end of the clamp is clamped with the first test structure or the second test structure, and the other end of the clamp is connected with the strength tester and is used for snapping the weld joint, so that the first test structure is separated from the second test structure.

Description

Technical Field

[0001] The present application belongs to the field of welding quality inspection, and in particular, relates to a weld strength testing device. Background Art

[0002] The engine copper-silver-zinc sealing component is formed by connecting a high-temperature alloy ring and a copper-silver-zinc alloy ring using the diffusion welding method. It is an annular workpiece. Since the part is an important part and its working environment is harsh, the design needs to understand the actual weld strength of the workpiece in order to simulate and analyze it and give the appropriate design structure and strength index control requirements.

[0003] Since the wall thickness of the two alloy rings is relatively thin, less than 5mm, the actual weld strength of the parts cannot be obtained by conventional methods. Although the wall thickness can be increased to achieve partial weld strength testing, this method is limited by the structural size of the parts and has a high processing cost, which is not conducive to engineering applications and is different from the actual welding state. Usually, in order to obtain the weld strength, the two alloy rods are first connected into a whole by diffusion welding, and then processed into standard mechanical properties. Although this method can obtain the weld strength, it cannot truly reflect the weld strength of the workpiece.

[0004] At present, the quality of welding can be determined by observing the structural strength of the internal crystals through an electron microscope. Among them, the patent with publication number CN103743767B proposes an electron microscopic detection method for the welding quality of brazed metal honeycomb structures. The method first cuts a sample from the brazed metal honeycomb structure. The sample is cut perpendicular to the direction of the skin, that is, parallel to the honeycomb core wall. Then the honeycomb core and the skin of the cut sample are separated. The electron microscopic detection method is used to observe the degree of damage to the brazing material layer at the top of the honeycomb core after separation from the skin, so as to judge the welding quality of the honeycomb core and the skin. The establishment of the electron microscopic detection method for the welding quality of brazed metal honeycomb structures makes it feasible to evaluate the welding quality between the skin and the honeycomb core of the brazed metal honeycomb structure. It can provide a basis for the production process improvement and product acceptance of brazed metal honeycomb structures, and has practical application value.

[0005] The above patent cuts a sample from the workpiece and uses an electron microscope to perform crystal detection on the sample. The structural strength of the weld can be determined based on the crystal detection results. However, the electron microscope detection process requires delicate operation and professional skills, which increases the difficulty and time cost of the detection. In addition, the electron microscope detection requires high-precision instruments and equipment, and the purchase and maintenance costs of these equipment are usually high. This may limit the application of this method in some places with limited resources or tight budgets. Summary of the invention

[0006] The present application provides a weld strength testing device, which improves the convenience of detecting the welding strength of workpieces.

[0007] According to a first aspect of the present application, a weld strength testing device is provided, the device comprising:

[0008] A standard test workpiece, the standard test workpiece comprises a first test structure and a second test structure, the first test structure comprises a first clamping portion extending along a first direction and a first connecting portion extending along a second direction, the first direction and the second direction are arranged perpendicularly, the second test structure comprises a second clamping portion extending along the first direction and a second connecting portion extending along the second direction, the first connecting portion and the second connecting portion are welded to form a weld, the weld structural strength of the weld is related to the thickness of the first clamping portion in the second direction, the structural strength of the first test structure is less than that of the second test structure, and the width of the standard test workpiece in the second direction is related to the wall thickness of the original annular workpiece;

[0009] A clamp, one end of which is clamped with the first test structure or the second test structure, and the other end of which is connected to the strength testing machine, is used to break the weld to separate the first test structure from the second test structure.

[0010] Optionally, the fixture comprises:

[0011] The clamping part has a first clamping groove along a first direction, a side groove wall of the first clamping groove has a second clamping groove penetrating the side groove wall, the extension direction of the second clamping groove is the second direction, the first clamping part or the second clamping part matches the first clamping groove, the first connecting part or the second connecting part matches the second clamping groove, and the side groove wall is the groove wall of the first clamping groove along the second direction.

[0012] Optionally, the clamping portion is a cylinder, and the cylinder extends along the second direction;

[0013] The distance between the lower groove wall of the first clamping groove and the axis of the cylinder along the third direction is half the thickness of the first clamping portion or the second clamping portion, and the lower groove wall is the groove wall of the first clamping groove in the opposite direction along the third direction, and the third direction is perpendicular to the first direction and the second direction respectively;

[0014] The length of the first clamping groove along the second direction is greater than the length of the first clamping portion and the second clamping portion along the second direction;

[0015] The depth of the first clamping groove along the third direction is greater than twice the height of the first clamping portion or the second clamping portion along the third direction;

[0016] The distance between the top wall of the first clamping groove and the top surface of the side groove wall is greater than the height of the first clamping part or the second clamping part along the third direction. The top wall is the groove wall of the first clamping groove along the third direction, and the top surface is the surface of the side groove wall along the third direction.

[0017] Optionally, a width of the second clamping groove along the first direction is greater than a width of the first connecting portion or the second connecting portion in the first direction.

[0018] Optionally, the thickness of the side groove wall along the second direction is less than half of the distance between the first clamping portion and the second clamping portion.

[0019] Optionally, a through hole penetrating the top wall is provided on the top wall, and the third direction is perpendicular to both the first direction and the second direction;

[0020] The fixture also includes:

[0021] The fixing piece is used to pass through the through hole and extend into the first clamping groove to fix the first clamping part or the second clamping part in the first clamping groove.

[0022] Optionally, the through hole is a threaded hole, and the fixing piece is a bolt matching the threaded hole.

[0023] Optionally, the fixture further comprises:

[0024] A connecting head is connected to a side of the clamping portion away from the second clamping groove, the connecting head is arranged in the opposite direction of the second direction, an external thread is provided on the outer surface of the connecting head, and the connecting head is connected to the strength testing machine through the external thread.

[0025] Optionally, there are two clamps, which are respectively a first clamp and a second clamp, wherein one end of the first clamp clamps the first test structure, and the other end of the first clamp is connected to a strength testing machine; the first end of the second clamp clamps the second test structure, and the other end of the second clamp is connected to a strength testing machine, and the strength testing machine drives the first clamp and the second clamp to move in opposite directions to break the weld.

[0026] Optionally, the first connecting portion and the second connecting portion are welded to form a weld, comprising:

[0027] The first connection portion and the second connection portion are welded to form a weld by diffusion welding or brazing.

[0028] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0029] The embodiment of the present application provides a weld strength testing device, which includes a standard test workpiece and a fixture, wherein the standard test workpiece includes a first test structure and a second test structure, the first test structure includes a first clamping portion extending along a first direction and a first connecting portion extending along a second direction, the first direction and the second direction are vertically arranged, the second test structure includes a second clamping portion extending along the first direction and a second connecting portion extending along the second direction, the first connecting portion and the second connecting portion are welded to form a weld, the weld structural strength of the weld is related to the thickness of the first clamping portion in the second direction, and the structural strength of the first test structure is less than that of the second test structure; one end of the fixture is clamped with the first test structure or the second test structure, and the other end of the fixture is connected to a strength testing machine, which is used to break the weld to separate the first test structure and the second test structure. Based on this, the weld structural strength of the weld is accurately tested by designing a standard test workpiece with a first test structure and a second test structure. The first clamping part or the second clamping part can be clamped with the fixture, so that the strength tester can provide tensile force for strength testing. The weld formed between the first connection part and the second connection part has a structural strength that is related to the thickness of the first clamping part in the second direction. This design enables the test to directly reflect the strength performance of the weld under different thickness conditions. By adjusting the thickness of the first clamping part, different application scenarios and strength requirements can be simulated, thereby more accurately evaluating the performance of the weld.

[0030] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0032] Figure 1 is a schematic structural diagram of a standard test workpiece in a weld strength testing device according to an exemplary embodiment;

[0033] Figure 2 is a schematic structural diagram of a fixture in a weld strength testing device according to an exemplary embodiment;

[0034] Figure 3 is a schematic diagram of a partial structure of a fixture in a weld strength testing device according to an exemplary embodiment;

[0035] Figure 4 The figure is a schematic assembly diagram of a fixture holding a standard test workpiece in a weld strength testing device according to an exemplary embodiment.

[0036] Legend:

[0037] legend name legend name 100 Standard test workpiece 110 First test structure 111 First clamping portion 112 First connection part 120 Second test structure 121 Second clamping part 122 Second connection part 130 Weld 200 Fixture 210 Clamping part 211 First card slot 211a Side groove wall 211b Lower tank wall 211c Top wall 212 Second card slot 220 Fixings 230 Connectors DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0040] Based on this, the present application provides a weld strength testing device. The weld strength testing device provided in the embodiment of the present application is first introduced below.

[0041] Embodiment 1;

[0042] Figure 1 A schematic diagram of the structure of a standard test workpiece in a weld strength testing device provided in one embodiment of the present application is shown; Figure 2 A schematic diagram showing the structure of a fixture in a weld strength testing device provided in one embodiment of the present application is shown; Figure 3 FIG. 1 is a schematic diagram showing a partial structure of a fixture in a weld strength testing device provided by an embodiment of the present application. Figure 1-3 As shown, it may include the following structures:

[0043] A standard test workpiece 100, the standard test workpiece 100 includes a first test structure 110 and a second test structure 120, the first test structure 110 includes a first clamping portion 111 extending along a first direction and a first connecting portion 112 extending along a second direction, the first direction and the second direction are vertically arranged, the second test structure 120 includes a second clamping portion 121 extending along the first direction and a second connecting portion 122 extending along the second direction, the first connecting portion 112 and the second connecting portion 122 are welded to form a weld 130, the structural strength of the weld 130 is related to the thickness of the first clamping portion 111 in the second direction, the structural strength of the first test structure 110 is less than that of the second test structure 120, and the width of the standard test workpiece 100 in the second direction is related to the wall thickness of the original annular workpiece;

[0044] The fixture 200 has one end clamped with the first test structure 110 or the second test structure 120 , and the other end of the fixture 200 is connected to the strength testing machine, and is used to break the weld 130 to separate the first test structure 110 from the second test structure 120 .

[0045] According to the diameter of the original annular workpiece, a suitable cutting arc length is given by calculation under the premise of ensuring that the arc length is close to a straight line, thereby determining the cutting range on the annular workpiece, and the cutting arc length is related to the thickness of the standard test workpiece 100 in the third direction. The original annular workpiece is formed by annular welding of two concentric annular workpieces, and the materials of the two annular workpieces can be the same material or non-metallic material.

[0046] After determining the cutting range, the wire cutting method is used to cut the test workpiece along the axial direction of the original annular workpiece according to the given cutting arc length, ensuring that the center of the test workpiece passes through the center of the annular part. The thickness of the original annular workpiece is the width of the test workpiece. The test workpiece is cut and polished to be processed into a standard test workpiece 100, wherein the standard test workpiece 100 includes a first test structure 110 and a second test structure 120. The first test structure 110 and the second test structure 120 are two different annular workpieces in the original annular workpiece, wherein the first test structure 110 includes a first clamping portion 111 extending along a first direction and a first connecting portion 112 extending along a second direction, and the second test structure 120 also includes a second clamping portion 121 and a second connecting portion 122 extending along the first direction, and the first connecting portion 112 and the second connecting portion 122 are connected by welding to form a weld 130, and the weld 130 is formed when the two annular workpieces are annularly welded; wherein the first connecting portion 112 and the second connecting portion 122 are welded by diffusion welding or brazing to form the weld 130, that is, the two concentric annular workpieces are welded by diffusion welding or brazing.

[0047] In addition, since the first test structure 110 and the second test structure 120 may be made of two different materials, the structural strengths they withstand are also different. Of the first test structure 110 and the second test structure 120, the test structure with lower structural strength is the first test structure 110. In order to ensure that the first test structure 110 does not break in subsequent strength tests, it is necessary to ensure that the structural strength of the first test structure 110 is greater than 30% of the structural strength of the weld 130 at the weld 130. The structural strength of the first test structure 110 is related to the width of the first clamping portion 111 in the second direction. Therefore, the structural strength that the first clamping portion 111 can withstand in the second direction needs to be greater than 30% of the welding structural strength at the weld 130.

[0048] In this embodiment, the first direction refers to the direction from left to right, the second direction refers to the direction from front to back, and the third direction refers to the direction from bottom to top.

[0049] The weld strength testing device also includes a fixture 200, one end of which can be clamped with the first test structure 110 or the second test structure 120 of the standard test workpiece 100, and the other end of the fixture 200 is connected to the strength testing machine; after the standard test workpiece 100 is clamped with the first test structure 110 or the second test structure 120 by the strength testing machine through the fixture 200, the second test structure 120 or the first test structure 110 at the other end of the standard test workpiece 100 can also be fixed by other fixing methods, and then the strength testing machine is started to perform a weld 130 strength test on the first test structure 110 or the second test structure 120 according to the standard tensile testing machine test procedure.

[0050] Optionally, in this embodiment, the clamp 200 also includes a clamping portion 210, the clamping portion 210 is provided with a first clamping groove 211 along the first direction, the side groove wall 211a of the first clamping groove 211 is provided with a second clamping groove 212 penetrating the side groove wall 211a, the extension direction of the second clamping groove 212 is the second direction, the first clamping portion 111 or the second clamping portion 121 matches the first clamping groove 211, the first connecting portion 112 or the second connecting portion 122 matches the second clamping groove 212, and the side groove wall 211a is the groove wall of the first clamping groove 211 along the second direction.

[0051] By opening a first clamping groove 211 arranged along the first direction on the clamping portion 210 and opening a second clamping groove 212 arranged along the second direction on the side groove wall 211a of the first clamping groove 211, and the first clamping groove 211 matches the first clamping portion 111 or the second clamping portion 121, and the second clamping groove 212 matches the first connecting portion 112 or the second connecting portion 122, the first clamping portion 111 of the first test structure 110 can be clamped in the first clamping groove 211, and the first connecting portion 112 can be clamped in the second clamping groove 212, so that the clamping portion 210 of the fixture 200 can firmly clamp the first test structure 110, and similarly, can also firmly clamp the second test structure 120, which is conducive to the subsequent strength test of the standard test workpiece 100 by a strength testing machine.

[0052] Optionally, in this embodiment, the clamping portion 210 is a cylinder extending along the second direction; the clamping portion 210 is configured as a cylinder so that the clamping portion 210 has greater structural strength, thereby reducing the possibility of the clamping portion 210 breaking during a structural strength test.

[0053] The distance between the lower groove wall 211b of the first clamping groove 211 and the axis of the cylinder along the third direction is half the thickness of the first clamping portion 111 or the second clamping portion 121. The lower groove wall 211b is the groove wall of the first clamping groove 211 in the opposite direction of the third direction. The third direction is perpendicular to the first direction and the second direction respectively. There is a distance between the lower groove wall 211b and the axis of the cylinder along the third direction, which indicates that the lower groove wall 211b is located in the opposite direction of the third direction of the axis.

[0054] The length of the first engaging groove 211 along the second direction is greater than the length of the first engaging portion 111 and the second engaging portion 121 along the second direction, thereby enabling the first engaging portion 111 or the second engaging portion 121 to enter the first engaging groove 211 and engage with the first engaging groove 211 .

[0055] The depth of the first clamping groove 211 along the third direction is greater than twice the height of the first clamping portion 111 or the second clamping portion 121 along the third direction, thereby allowing the first clamping portion 111 or the second clamping portion 121 to be completely and fully clamped into the first clamping groove 211, so that the first clamping groove 211 can be more firmly clamped with the first clamping portion 111 or the second clamping portion 121.

[0056] The distance between the top wall 211c of the first clamping groove 211 and the top surface of the side groove wall 211a is greater than the height of the first clamping portion 111 or the second clamping portion 121 along the third direction. The top wall 211c is the groove wall of the first clamping groove 211 along the third direction, and the top surface is the surface of the side groove wall 211a along the third direction. As a result, the first clamping portion 111 or the second clamping portion 121 can utilize the distance between the top wall 211c and the top surface of the side groove wall 211a to enter the first clamping groove 211 to achieve clamping with the first clamping groove 211, thereby improving the convenience of the first clamping groove 211 to clamp the first clamping portion 111 or the second clamping portion 121.

[0057] Optionally, in this embodiment, the width of the second snap-fitting groove 212 along the first direction is greater than the width of the first connection part 112 or the second connection part 122 in the first direction, thereby allowing the first connection part 112 or the second connection part 122 to enter the second snap-fitting groove 212, thereby facilitating the second snap-fitting groove 212 to complete the snap-fitting of the first connection part 112 and the second connection part 122.

[0058] The thickness of the side groove wall 211a along the second direction is less than half of the distance between the first clamping portion 111 and the second clamping portion 121, thereby avoiding the side groove wall 211a being too thick along the second direction, which makes it impossible to use two clamps 200 to respectively clamp the first test structure 110 and the second test structure 120, thereby improving the convenience of using the clamp 200.

[0059] Embodiment 2:

[0060] Optionally, in this embodiment, a through hole penetrating the top wall 211c is provided on the top wall 211c;

[0061] The fixture 200 also includes:

[0062] The fixing member 220 is used to pass through the through hole and extend into the first clamping groove 211 to fix the first clamping portion 111 or the second clamping portion 121 in the first clamping groove 211 .

[0063] By opening a through hole in the upper groove wall in the third direction of the first clamping groove 211, the fixing member 220 can pass through the through hole and act on the first clamping portion 111 or the second clamping portion 121 clamped in the first clamping groove 211. As a result, the fixing member 220 can fix the first clamping portion 111 and the second clamping portion 121 in the clamping groove in the third direction, so that the clamp 200 can more stably fix the first test structure 110 or the second test structure 120, so that the subsequent strength test can be carried out smoothly.

[0064] Optionally, in this embodiment, the through hole is a threaded hole, and the fixing member 220 is a bolt matching the threaded hole.

[0065] By setting the through hole as a threaded hole and the fixing member 220 as a bolt, and utilizing the rotational connection between the bolt and the threaded hole, the bolt can be rotated into the first clamping groove 211, and the length of the bolt rising into the first clamping groove 211 can be freely adjusted according to the height of the first clamping portion 111 or the second clamping portion 121 in the first clamping groove 211 in the third direction, so that the fixing member 220 can better match the first clamping portion 111 or the second clamping portion 121 at different heights.

[0066] Optionally, in this embodiment, the fixture 200 further includes:

[0067] The connector 230 is connected to a side of the clamping portion 210 away from the second clamping groove 212. The connector 230 is arranged in the opposite direction of the second direction. An external thread is provided on the outer surface of the connector 230. The connector 230 is connected to the strength testing machine via the external thread.

[0068] By connecting the connecting head 230 and the clamping part 210 in a direction away from the second clamping groove 212, the connecting head 230 and the second clamping groove 212 are opposite to each other, and the connecting head 230 is arranged in the opposite direction of the second direction, so the connecting head 230 and the connecting head 230 and the first clamping groove 211 are also in a vertical relationship. Therefore, by making the force relationship between the connecting head 230 and the first clamping part 111 or the second clamping part 121 also vertical, and the force relationship with the first connecting part 112 or the second connecting part 122 is parallel or colinear, after the connecting head 230 is connected to the strength testing machine, it can be more labor-saving when performing strength testing.

[0069] Furthermore, an external thread is provided on the connecting head 230 , and the connecting head 230 can be detachably connected to the strength testing machine through the external thread, which is beneficial to the disassembly and replacement of the clamp 200 and improves the convenience for the use of the clamp 200 .

[0070] In the above-mentioned embodiment 2, each structure in the above-mentioned embodiment 1 is included, and each process in the above-mentioned embodiment 1 can be implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0071] Embodiment 3:

[0072] Figure 4 The figure shows an assembly diagram of a fixture holding a standard test workpiece in a weld strength test device provided by an embodiment of the present application. Figure 4 As shown,

[0073] Optionally, in this embodiment, the number of the clamps 200 is two, and the two clamps 200 are respectively a first clamp 200 and a second clamp 200, wherein one end of the first clamp 200 clamps the first test structure 110, and the other end of the first clamp 200 is connected to the strength testing machine; the first end of the second clamp 200 clamps the second test structure 120, and the other end of the second clamp 200 is connected to the strength testing machine, and the strength testing machine drives the first clamp 200 and the second clamp 200 to move in opposite directions to break the weld 130.

[0074] By setting up two clamps 200, one end of the first clamp 200 is clamped to the first test structure 110, and one end of the second clamp 200 is clamped to the second test structure 120, and the other ends of the first clamp 200 and the second clamp 200 are connected to the strength testing machine, so that the strength testing machine can clamp the first test structure 110 and the second test structure 120 of the standard test workpiece 100 through the first clamp 200 and the second clamp 200 respectively for strength testing, thereby making the strength test more convenient.

[0075] In the above-mentioned embodiment 3, each structure in the above-mentioned embodiment 1 and / or 2 is included, and each process in the above-mentioned embodiment 1 and / or 2 can be implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0076] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A weld strength testing device, characterized in that: The device comprises: A standard test workpiece, the standard test workpiece comprising a first test structure and a second test structure, the first test structure comprising a first clamping portion extending along a first direction and a first connecting portion extending along a second direction, the first direction and the second direction being arranged perpendicularly, the second test structure comprising a second clamping portion extending along the first direction and a second connecting portion extending along the second direction, the first connecting portion and the second connecting portion being welded to form a weld, the weld structural strength of the weld being related to the thickness of the first clamping portion in the second direction, the structural strength of the first test structure being less than that of the second test structure, and the width of the standard test workpiece in the second direction being related to the wall thickness of the original annular workpiece; A fixture, one end of which is clamped with the first test structure or the second test structure, and the other end of which is connected to a strength testing machine, is used to break the weld to separate the first test structure from the second test structure.

2. The weld strength testing device according to claim 1, characterized in that: The fixture comprises: The clamping portion comprises a first clamping groove formed along a first direction, a side groove wall of the first clamping groove comprises a second clamping groove penetrating the side groove wall, the extension direction of the second clamping groove is the second direction, the first clamping portion or the second clamping portion matches the first clamping groove, the first connecting portion or the second connecting portion matches the second clamping groove, and the side groove wall is the groove wall of the first clamping groove along the second direction.

3. The weld strength testing device according to claim 2, characterized in that: The clamping portion is a cylinder, and the cylinder extends along the second direction; The distance between the lower groove wall of the first clamping groove and the axis of the cylinder along the third direction is half the thickness of the first clamping portion or the second clamping portion, and the lower groove wall is the groove wall of the first clamping groove in the opposite direction along the third direction, and the third direction is perpendicular to the first direction and the second direction respectively; The length of the first clamping groove along the second direction is greater than the length of the first clamping portion and the second clamping portion along the second direction; The depth of the first clamping groove along the third direction is greater than twice the height of the first clamping portion or the second clamping portion along the third direction; The distance between the top wall of the first clamping groove and the top surface of the side groove wall is greater than the height of the first clamping portion or the second clamping portion along the third direction, the top wall is the groove wall of the first clamping groove along the third direction, and the top surface is the surface of the side groove wall along the third direction.

4. The weld strength testing device according to claim 3, characterized in that: The width of the second clamping groove along the first direction is greater than the width of the first connecting portion or the second connecting portion in the first direction.

5. The weld strength testing device according to claim 4, characterized in that: The thickness of the side groove wall along the second direction is less than half of the distance between the first clamping portion and the second clamping portion.

6. The weld strength testing device according to claim 3, characterized in that: The top wall is provided with a through hole penetrating the top wall; The fixture also includes: A fixing member, wherein the fixing member is used to pass through the through hole and extend into the first clamping groove to fix the first clamping portion or the second clamping portion in the first clamping groove.

7. The weld strength testing device according to claim 6, characterized in that: The through hole is a threaded hole, and the fixing piece is a bolt matching the threaded hole.

8. The weld strength testing device according to claim 6, characterized in that: The fixture also includes: A connecting head, the connecting head is connected to a side of the clamping portion away from the second clamping groove, the connecting head is arranged in the opposite direction of the second direction, an external thread is provided on the outer surface of the connecting head, and the connecting head is connected to the strength testing machine through the external thread.

9. The weld strength testing device according to claim 1, characterized in that: There are two clamps, which are respectively a first clamp and a second clamp, wherein one end of the first clamp clamps the first test structure, and the other end of the first clamp is connected to the strength testing machine; the first end of the second clamp clamps the second test structure, and the other end of the second clamp is connected to the strength testing machine, and the strength testing machine drives the first clamp and the second clamp to move in opposite directions to break the weld.

10. The weld strength testing device according to any one of claims 1 to 9, characterized in that: The first connection part and the second connection part are welded to form a weld, comprising: The first connection portion and the second connection portion are welded by diffusion welding or brazing to form the weld.

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