A tensile shear test device and method for lap welding specimen

Abstract

The present invention provides a tensile shear test device for lap welding samples, comprising a tensile testing machine and a clamping kit, wherein the clamping kit is slidably connected to the tensile testing machine through the groove and the convex groove; the clamping kit comprises a first chuck kit, wherein the first chuck kit comprises a left clamp block and a right clamp block, wherein the inner sides of the left clamp block and the right clamp block are provided with a ramp slideway, wherein the two ramp slideways are centrally symmetrically arranged, wherein the inner sides of the left clamp block and the right clamp block are further provided with a left clamping module and a right clamping module, wherein the left clamping module and the right clamping module are respectively slidably connected to the ramp slideways of the left clamp block and the right clamp block, wherein the side where the left clamping module and the right clamping module are close to each other is provided with an inclined surface, wherein the inclined surfaces of the left clamping module and the right clamping module are centrally symmetrically arranged. The tensile shear test device for lap welding samples provided by the present invention improves the measurement accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of test devices, and in particular relates to a tensile shear test device and method for lap welding specimens. Background Art

[0002] As an important connection form of engineering structures, lap welding is widely used in large-scale manufacturing projects such as building steel structures, roads, bridges, etc. Its quality directly affects the safety performance of engineering projects. The tensile shear test is mainly used to detect the tensile shear strength of lap welded joints, and is an important test item for the quality assessment of lap welded specimens. The tensile shear test of lap welded specimens is generally tested using a tensile testing machine. The corresponding fixture is selected according to the specimen thickness specification and the lap misalignment size for clamping. The tensile testing machine slowly applies axial tension to the upper and lower clamping ends of the lap specimen, and continues to load until the specimen breaks, and the tensile shear strength of the lap specimen is measured.

[0003] Ensuring that the test tensile force direction is parallel to the longitudinal axis of the specimen is the key to accurately measuring the tensile shear strength of lap welded specimens. The traditional testing method has the following defects:

[0004] 1. The materials and specifications of the overlapped specimens vary, and special fixtures are configured for different overlapped misalignment sizes, which are large in number, high in cost, and complex to replace;

[0005] 2. Using conventional tensile testing machine fixtures to directly clamp the overlapped specimens and forcibly straighten the overlapped specimens can easily lead to damage to the testing machine, partial distortion of the specimens, and the actual axial force is lower than the tensile indication of the testing machine, reducing the test accuracy.

[0006] Therefore, it is necessary to design a tensile shear test device for lap welded specimens that is easy to disassemble and assemble, effectively solves the clamping problem of lap welded specimens of different specifications, and improves the measurement accuracy. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a tensile shear test device and a test method for lap welded specimens, which are convenient to disassemble and assemble, effectively solve the clamping problem of lap welded specimens of different specifications, and improve measurement accuracy.

[0008] The present invention provides a tensile shear test device for a lap welding sample, comprising a tensile testing machine and a clamping kit, wherein the tensile testing machine is provided with a groove, the clamping kit is provided with a convex groove matching the groove, and the clamping kit is slidably connected with the tensile testing machine through the groove and the convex groove; the clamping kit comprises a first clamping head kit, the first clamping head kit comprises a left clamping block and a right clamping block, the outer sides of the left clamping block and the right clamping block are provided with the convex groove, the inner sides of the left clamping block and the right clamping block are provided with a ramp slideway, the two ramp slideways are centrally symmetrically arranged, the inner sides of the left clamping block and the right clamping block are further provided with a left clamping module and a right clamping module, the left clamping module and the right clamping module are respectively slidably connected with the ramp slideways of the left clamping block and the right clamping block, the side where the left clamping module and the right clamping module are close to each other is provided with an inclined surface, the inclined surfaces of the left clamping module and the right clamping module are centrally symmetrically arranged, and the left clamping module and the right clamping module cooperate to clamp the lap welding sample to be tested.

[0009] Preferably, the clamping kit also includes a second chuck kit, the second chuck kit includes a second left clamp block and a second right clamp block, the outer sides of the second left clamp block and the second right clamp block are provided with the convex groove, the first chuck kit and the second chuck kit are respectively arranged at the upper and lower parts of the tensile testing machine and are slidably connected to the tensile testing machine.

[0010] Preferably, the inner sides of the second left clamp block and the second right clamp block are straight planes with uneven surfaces, and the second left clamp block and the second right clamp block are close to each other and cooperated to clamp the lap welding sample to be tested.

[0011] Preferably, the left clamp block and the right clamp block are respectively provided with a connecting portion at one end of the ramp slide, and the first clamp kit also includes a left control shaft and a right control shaft, the left control shaft passes through the connecting portion and is rotatably connected to the left clamping module, and the right control shaft passes through the connecting portion and is rotatably connected to the right clamping module, and the left control shaft and the right control shaft respectively control the positions of the left clamping module and the right clamping module in the ramp slide.

[0012] Preferably, the outer surfaces of the left control shaft and the right control shaft are provided with threads, the connecting portion is provided with internal threads corresponding to the threads, and the left control shaft and the right control shaft are rotated through threaded connection to control the positions of the left clamping module and the right clamping module.

[0013] Preferably, one side of the left clamping block and the right clamping block is respectively provided with a scale ruler parallel to the ramp slide, and the "0" scales of the two scale rulers are at the same end. In the initial state, one end of the left clamping module and the right clamping module is aligned with the position of the "0" scale, and the reading of the scale ruler is the horizontal distance after the left clamping module and the right clamping module slide on the ramp slide.

[0014] Preferably, a sample positioning device is also provided on the left clamping module or the right clamping module, and the sample positioning device is "L"-shaped. The sample positioning device includes a bottom plate and a vertical plate, and the bottom plate and the vertical plate are perpendicular to each other. The bottom plate is movably connected to the left clamping module or the right clamping module, and the vertical plate extends outward relative to the left clamping module or the right clamping module.

[0015] Preferably, a sliding groove is provided on the bottom plate, the bottom plate is connected to the left clamping module or the right clamping module via a limiting bolt, and the sample positioning device slides forward and backward relative to the limiting bolt via the sliding groove.

[0016] Preferably, two or more support bars are arranged on the vertical plate, and the support bars extend out of the vertical plate and face toward a side where the left clamping module and the right clamping module are close to each other, and the support bars are on the same plane.

[0017] The present invention also provides a tensile shear test method for a lap welded sample, which uses the tensile shear test device for a lap welded sample as described in any one of the above items to perform the test, and the method comprises the following steps:

[0018] The first chuck set and the second chuck set are respectively installed on the upper and lower parts of the tensile testing machine and fixed;

[0019] Measure the misalignment size of the lap weld specimen, M;

[0020] Adjust the positions of the left clamping module and the right clamping module so that the readings of the left clamping module and the right clamping module on the scale are also M respectively;

[0021] Slide the specimen positioning device to the middle position of the left clamping module or the right clamping module, and tighten the limit bolt;

[0022] Place the upper left end of the lap welding specimen between the left clamping module and the right clamping module, and make the lap welding specimen close to the support bar of the specimen positioning device, ensure that the lap welding specimen is placed vertically with the left clamping module and the right clamping module, and the length of the lap welding specimen extending into the left clamping module and the right clamping module is greater than or equal to 2 / 3 of the height of the left clamping module and the right clamping module, start the tensile testing machine, and clamp the upper left end of the lap welding specimen;

[0023] Adjust the height of the second clamp set of the tensile testing machine so that the lower right end of the lap welded sample extends between the second left clamp block and the second right clamp block of the second clamp set, and ensure that the length of the lap welded sample extending into the second clamp set is greater than or equal to 2 / 3 of the height of the second clamp set, start the tensile testing machine, and clamp the lower right end of the lap welded sample;

[0024] Start the tensile testing machine and slowly apply axial tension until the lap welded specimen breaks, measure the tensile shear strength of the lap welded specimen, loosen the first chuck set and the second chuck set, remove the remaining sample of the lap welded specimen, and complete the test.

[0025] The tensile shear test device for the lap welded sample provided by the present invention can flexibly adjust the positions of the left clamping module and the right clamping module so that the offset distance between the left clamping module and the lap welded sample is the same, thereby ensuring that when the lap welded sample is clamped by the first chuck kit and the second chuck kit respectively, the tensile direction of the testing machine is parallel to the longitudinal axis of the test piece, thereby avoiding the sample from being twisted or forcibly straightened, ensuring that the data measured by the tensile shear test device is the true value of the lap welded sample, and improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other purposes, features and advantages of the present invention will become more clear by more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the accompanying drawings are not deliberately scaled to the actual size, and the focus is on illustrating the main purpose of the present invention.

[0027] Figure 1 A schematic structural diagram of a first chuck assembly of a tensile shear test device for lap welded specimens provided in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0029] Figure 3 A schematic structural diagram of another perspective of the first chuck assembly of the tensile shear test device for lap welded specimens provided by an embodiment of the present invention;

[0030] Figure 4 A schematic structural diagram of a second chuck assembly of a tensile shear test device for lap welded specimens provided in an embodiment of the present invention;

[0031] Figure 5 A schematic structural diagram of a tensile shear test apparatus for lap welded specimens provided in an embodiment of the present invention.

[0032] In the figure: tensile testing machine 1; clamping kit 2; groove 3; convex groove 4; first chuck kit 5; left clamp 6; right clamp 7; ramp slide 8; left clamping module 9; right clamping module 10; second chuck kit 11; second left clamp 12; second right clamp 13; connecting part 14; left control shaft 15; right control shaft 16; scale ruler 17; "0" scale 18; sample positioning device 19; bottom plate 20; vertical plate 21; sliding groove 22; limiting bolt 23; support bar 24; lap welding sample 25; second groove 26; second convex groove 27. DETAILED DESCRIPTION

[0033] To facilitate understanding of the present invention, the technical solutions of the embodiments of the present invention will be described more comprehensively below with reference to the relevant drawings.

[0034] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to another element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0035] The “left” and “right” mentioned herein are only used to illustrate the relative positions of different elements and are not intended to be specific limitations on the characteristics of the elements.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art. The terms used in the specification herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] Please refer to Figure 1-Figure 4 The embodiment of the present invention provides a tensile shear test device for lap welding specimens, including a tensile testing machine 1 and a clamping kit 2, the tensile testing machine 1 is provided with a groove 3, the clamping kit 2 is provided with a convex groove 4 matching the groove 3, the clamping kit 2 and the tensile testing machine 1 are slidably connected through the groove 3 and the convex groove 4. In this embodiment, the groove 3 and the convex groove 4 used to connect the tensile testing machine 1 and the clamping kit 2 are dovetail type slide grooves. Because in actual installation, the slide groove direction of the tensile testing machine 1 and the clamping kit 2 is perpendicular to the force application direction of the tensile testing machine 1, and the groove 3 and the convex groove 4 are set as dovetail type slide grooves. On the one hand, it can ensure that the clamping kit 2 is not easy to slide during the operation of the tensile testing machine 1, and on the other hand, it can also ensure that the clamping kit 2 will not fall from the groove 3 during the force application process of the tensile testing machine 1. The dovetail type slide groove can increase the bearing capacity of the clamping kit 2.

[0038] Please refer to Figure 1-Figure 4The clamping kit 2 includes a first clamp kit 5, which includes a left clamp block 6 and a right clamp block 7. The outer sides of the left clamp block 6 and the right clamp block 7 are provided with a convex groove 4. The first clamp kit 5 is slidably connected to the tensile testing machine 1 through the convex groove 4 of the left clamp block 6 and the right clamp block 7. The inner sides of the left clamp block 6 and the right clamp block 7 are provided with a ramp slide 8, and the two ramp slides 8 are centrally symmetrically arranged. The centrally symmetrical arrangement of the two ramp slides specifically refers to that the inclination directions of the slopes of the two ramp slides 8 are opposite, that is, the planes where the slopes of the two ramp slides 8 are located are parallel. The inner sides of the left clamp block 6 and the right clamp block 7 are also provided with a left clamp module 9 and a right clamp module 10, and the second groove 26 track is respectively provided on the ramp slide 8, and the left clamp module 9 and the right clamp module 10 are respectively provided with a second convex groove 27, and the left clamp module 9 and the right clamp module 10 are respectively slidably connected with the ramp slide 8 of the left clamp block 6 and the right clamp block 7. In this embodiment, the second groove 26 and the second convex groove 27 are also dovetail type slides. The side where the left clamp module 9 and the right clamp module 10 are close to each other is set as an inclined surface, and the inclined surfaces of the left clamp module 9 and the right clamp module 10 are centrally symmetrically arranged. Similarly, the centrally symmetrical arrangement of the inclined surfaces described here also refers to the opposite inclination direction of the inclined surfaces. The left clamp module 9 and the right clamp module 10 cooperate to clamp the lap welding sample 25 to be tested, that is, in the working state, the left clamp module 9 and the right clamp module 10 are controlled to approach each other and clamp the lap welding sample 25 to be tested. The inner inclined surfaces of the left clamping module 9 and the right clamping module 10 are uneven, that is, rough surfaces, preferably fine-grained rough surfaces, so as to increase the friction between the contact surfaces of the left clamping module 9 and the right clamping module 10 and the lap welding sample 25, and avoid the lap welding sample 25 from loosening during the test, which affects the test result value. The device adopts a sliding adjustment clamp design, which can freely adjust the horizontal offset distance of the clamping module according to the misalignment size of the lap welding sample, ensure that the longitudinal axis of the sample is parallel to the test tension, and the device is easy to disassemble and assemble, effectively solving the clamping problem of lap joint specimens of different specifications and improving the measurement accuracy.

[0039] Please refer to Figure 4 In this embodiment, the clamping kit 2 also includes a second chuck kit 11, which includes a second left clamp block 12 and a second right clamp block 13. The outer sides of the second left clamp block 12 and the second right clamp block 13 are provided with a convex groove 4, and the convex groove 4 of the second chuck kit 11 is also a dovetail type slide groove. The first chuck kit 5 and the second chuck kit 11 are respectively arranged at the upper and lower parts of the tensile testing machine 1 and are slidably connected to the tensile testing machine 1. In this embodiment, the first chuck kit 5 is arranged above the tensile testing machine 1, and the second chuck kit 11 is arranged below the tensile testing machine 1. The distance between the first chuck kit 5 and the second chuck kit 11 can be adjusted by the tensile testing machine 1.

[0040] In this embodiment, the inner sides of the second left clamp block 12 and the second right clamp block 13 are straight planes with uneven settings. The so-called uneven settings specifically refer to that the adjacent inner side surfaces of the second left clamp block 12 and the second right clamp block 13 are rough surfaces, preferably fine-grained rough surfaces, so as to increase the friction between the contact surfaces of the second left clamp block 12 and the second right clamp block 13 and the lap welding sample 25, and avoid the lap welding sample 25 from loosening during the test, which affects the numerical value of the test result; the so-called straight plane means that the adjacent inner side surfaces of the second left clamp block 12 and the second right clamp block 13 do not form an inclined surface. The second left clamp block 12 and the second right clamp block 13 are close to each other and cooperate to clamp the lap welding sample 25 to be tested.

[0041] Please refer to Figure 1 In this embodiment, the left clamp block 6 and the right clamp block 7 are respectively provided with a connection portion 14 at one end of the ramp slide 8, and the first clamping head set 5 also includes a left control shaft 15 and a right control shaft 16. The left control shaft 15 passes through the connection portion 14 and is rotationally connected to the left clamping module 9, and the right control shaft 16 passes through the connection portion 14 and is rotationally connected to the right clamping module 10. The rotation connection here specifically refers to the fixed relative position of the left control shaft 15 and the left clamping module 9. At this time, the left control shaft 15 can rotate around its own axis without driving the left clamping module 9 to rotate, and the right control shaft 16 and the right clamping module 10 are the same. The left control shaft 15 and the right control shaft 16 respectively control the positions of the left clamping module 9 and the right clamping module 10 in the ramp slide 8. Furthermore, the outer surfaces of the left control shaft 15 and the right control shaft 16 are provided with threads, and the connecting portion 14 is provided with internal threads corresponding to the threads. The left control shaft 15 and the right control shaft 16 are connected and rotated to control the positions of the left clamping module 9 and the right clamping module 10 through the threads. Figure 1 As shown, when the right control shaft 16 rotates inward, the right clamping module 10 can be pushed to deviate to the left, and when the left control shaft 15 rotates outward, the left clamping module 9 can be driven to deviate to the left.

[0042] Please refer to Figure 1In this embodiment, a scale ruler 17 parallel to the ramp slide 8 is respectively provided on one side of the left clamping block 6 and the right clamping block 7, and the "0" scale 18 of the two scale rulers 17 is at the same end. In the initial state, one end of the left clamping module 9 and the right clamping module 10 is aligned with the position of the "0" scale 18. The reading of the scale ruler 17 is the horizontal distance after the left clamping module 9 and the right clamping module 10 slide on the ramp slide 8, that is, the scale on the scale ruler 17 is marked after conversion. Here, the conversion is to convert the oblique displacement distance of any point on the inclined surface when the left clamping module 9 and the right clamping module 10 are obliquely displaced along the ramp slide 8 into a horizontal distance. In this way, after determining the misalignment size of the lap welding sample 25, the positions of the left clamping module 9 and the right clamping module 10 can be adjusted so that they are offset together by a distance equal to the misalignment size. At this time, the offset distance can be directly controlled according to the reading of the scale ruler 17, and no additional conversion is required during actual operation. By setting the scale ruler 17, the horizontal offset of the first clamping head set 5 can be displayed in real time, so that the misaligned clamp can be accurately adjusted.

[0043] Please refer to Figure 1-Figure 2 In the present invention, a sample positioning device 19 is further provided on the left clamping module 9 or the right clamping module 10. In the present embodiment, the sample positioning device 19 is provided on the right clamping module 10. The sample positioning device 19 is in an "L" shape, and comprises a bottom plate 20 and a vertical plate 21. The bottom plate 20 and the vertical plate 21 are perpendicular to each other. The bottom plate 20 is movably connected to the right clamping module 10, and the vertical plate 21 extends outward relative to the right clamping module 10. Furthermore, a sliding groove 22 is provided on the bottom plate 20, and the bottom plate 20 is connected to the right clamping module 10 through a limiting bolt 23, and the sample positioning device 19 slides forward and backward relative to the limiting bolt 23 through the sliding groove 22.

[0044] In a preferred embodiment, two or more support bars 24 are arranged on the vertical plate 21. The support bars 24 extend out of the vertical plate 21 and face the side where the left clamping module 9 and the right clamping module 10 are close to each other. The so-called support bars 24 face the side where the left clamping module 9 and the right clamping module 10 are close to each other, which means that when the sample positioning device 19 is arranged on the right clamping module 10, the support bars 24 face the left clamping module, and when the sample positioning device 19 is arranged on the left clamping module 9, the support bars 24 face the right clamping module. Two or more support bars 24 are on the same plane. In actual use, the lap welding sample 25 is close to the support bars 24, which can ensure that the lap welding sample 25 is placed vertically, that is, it can ensure that the force applied to the lap welding sample 25 during the test is parallel to the longitudinal axis of the lap welding sample 25, thereby improving the accuracy of the test.

[0045] The embodiment of the present invention further provides a tensile shear test method for a lap welded sample, which uses any of the above-mentioned tensile shear test devices for a lap welded sample to perform the test, and the method comprises the following steps:

[0046] The first chuck set 5 and the second chuck set 11 are respectively installed on the upper and lower parts of the tensile testing machine 1 and fixed. In actual installation, the first chuck set 5 is installed on the upper part of the tensile testing machine 1, and the second chuck set 11 is installed on the lower part of the tensile testing machine 1, and they are slidably installed through the groove 3 and the convex groove 4;

[0047] Measure the misalignment size of the lap welded sample 25, which is M. The misalignment size can be measured first by a measuring instrument such as a vernier caliper. The so-called misalignment size refers to the misalignment distance of the lap welded sample 25 when it is overlapped;

[0048] Adjust the positions of the left clamping module 9 and the right clamping module 10 so that the readings of the left clamping module 9 and the right clamping module 10 on the scale 17 are also M respectively; by rotating the right control shaft 16 inward, the right clamping module 10 is pushed to deviate to the left until the reading is M, and the left control shaft 15 is rotated outward, driving the left clamping module 9 to deviate to the left until the reading is also M. At this time, the first clamping head set 5 is offset to the left by a distance of M as a whole;

[0049] Slide the sample positioning device 19 to the middle position of the left clamping module 9 or the right clamping module 10, and tighten the limit bolt;

[0050] Place the upper left end of the lap welding sample 25 between the left clamping module 9 and the right clamping module 10, and make the lap welding sample 25 close to the support bar 24 of the sample positioning device 19, ensure that the lap welding sample 25 is placed vertically with the left clamping module 9 and the right clamping module 10, and the length of the lap welding sample 25 extending into the left clamping module 9 and the right clamping module 10 is greater than or equal to 2 / 3 of the height of the left clamping module 9 and the right clamping module 10, start the tensile testing machine 1, and clamp the upper left end of the lap welding sample 25;

[0051] Adjust the height of the second clamp set 11 of the tensile testing machine 1 so that the lower right end of the lap welding sample 25 extends between the second left clamp block 12 and the second right clamp block 13 of the second clamp set 11, and ensure that the length of the lap welding sample 25 extending into the second clamp set 11 is greater than or equal to 2 / 3 of the height of the second clamp set 11, start the tensile testing machine 1, and clamp the lower right end of the lap welding sample 25;

[0052] Start the tensile testing machine 1 and slowly apply axial tension until the lap weld sample 25 breaks, measure the tensile shear strength of the lap weld sample 25, loosen the first chuck set 5 and the second chuck set 11, remove the remaining sample of the lap weld sample 25, and complete the test.

[0053] The tensile shear test device for the lap welded sample provided by the present invention can flexibly adjust the positions of the left clamping module and the right clamping module so that the offset distance between the left clamping module and the lap welded sample is the same, thereby ensuring that when the lap welded sample is clamped by the first chuck kit and the second chuck kit respectively, the tensile direction of the testing machine is parallel to the longitudinal axis of the test piece, thereby avoiding the sample from being twisted or forcibly straightened, ensuring that the data measured by the tensile shear test device is the true value of the lap welded sample, and improving the measurement accuracy.

[0054] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0056] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A tensile shear test device for lap welded specimens, It is characterized in that It comprises a tensile testing machine and a clamping kit, the tensile testing machine is provided with a groove, the clamping kit is provided with a convex groove matching the groove, the clamping kit is slidably connected with the tensile testing machine through the groove and the convex groove; the clamping kit comprises a first clamping head kit, the first clamping head kit comprises a left clamping block and a right clamping block, the outer sides of the left clamping block and the right clamping block are provided with the convex groove, the inner sides of the left clamping block and the right clamping block are provided with a ramp slide, the two ramp slides are centrally symmetrically arranged, the inner sides of the left clamping block and the right clamping block are further provided with a left clamping module and a right clamping module, the left clamping module and the right clamping module are respectively slidably connected with the ramp slides of the left clamping block and the right clamping block, the side where the left clamping module and the right clamping module are close to each other is an inclined surface arrangement, the inclined surfaces of the left clamping module and the right clamping module are centrally symmetrically arranged, and the left clamping module and the right clamping module cooperate to clamp the lap welding sample to be tested; The left clamp block and the right clamp block are respectively provided with a connecting portion at one end of the ramp slide, and the first clamp kit also includes a left control shaft and a right control shaft. The left control shaft passes through the connecting portion and is rotatably connected to the left clamping module, and the right control shaft passes through the connecting portion and is rotatably connected to the right clamping module. The left control shaft and the right control shaft respectively control the positions of the left clamping module and the right clamping module in the ramp slide.

2. The tensile shear test device for lap welded specimens according to claim 1, It is characterized in that The clamping kit also includes a second chuck kit, which includes a second left clamp block and a second right clamp block, and the outer sides of the second left clamp block and the second right clamp block are provided with the convex groove. The first chuck kit and the second chuck kit are respectively arranged at the upper and lower parts of the tensile testing machine and are slidably connected to the tensile testing machine.

3. The tensile shear test device for lap welded specimens according to claim 2, It is characterized in that The inner sides of the second left clamp block and the second right clamp block are straight planes with uneven surfaces, and the second left clamp block and the second right clamp block are close to each other and cooperated to clamp the lap welding sample to be tested.

4. The tensile shear test device for lap welded specimens according to claim 1, It is characterized in that The outer surfaces of the left control shaft and the right control shaft are provided with threads, and the connecting portion is provided with internal threads corresponding to the threads. The left control shaft and the right control shaft are connected and rotated through threads to control the positions of the left clamping module and the right clamping module.

5. The tensile shear test device for lap welded specimens according to claim 1, It is characterized in that One side of the left clamping block and the right clamping block is respectively provided with a scale ruler parallel to the ramp slide, and the "0" scales of the two scale rulers are at the same end. In the initial state, one end of the left clamping module and the right clamping module is aligned with the position of the "0" scale, and the reading of the scale ruler is the horizontal distance after the left clamping module and the right clamping module slide on the ramp slide.

6. The tensile shear test device for lap welded specimens according to claim 1, It is characterized in that A sample positioning device is also provided on the left clamping module or the right clamping module. The sample positioning device is "L"-shaped and includes a bottom plate and a vertical plate. The bottom plate and the vertical plate are perpendicular to each other. The bottom plate is movably connected to the left clamping module or the right clamping module, and the vertical plate extends outward relative to the left clamping module or the right clamping module.

7. The tensile shear test device for lap welded specimens according to claim 6, It is characterized in that The bottom plate is provided with a sliding groove, the bottom plate is connected to the left clamping module or the right clamping module via a limiting bolt, and the sample positioning device slides forward and backward relative to the limiting bolt via the sliding groove.

8. The tensile shear test device for lap welded specimens according to claim 6, It is characterized in that The vertical plate is provided with two or more support bars, the support bars extend out of the vertical plate and face toward a side where the left clamping module and the right clamping module are close to each other, and the support bars are on the same plane.

9. A tensile shear test method for lap welded specimens, It is characterized in that The tensile shear test device for lap welding specimens according to any one of claims 1 to 8 is used to conduct the test, and the method comprises the following steps: The first chuck set and the second chuck set are respectively installed on the upper and lower parts of the tensile testing machine and fixed; Measure the misalignment size of the lap weld specimen, M; Adjust the positions of the left clamping module and the right clamping module so that the readings of the left clamping module and the right clamping module on the scale are also M respectively; Slide the specimen positioning device to the middle position of the left clamping module or the right clamping module, and tighten the limit bolt; Place the upper left end of the lap welding specimen between the left clamping module and the right clamping module, and make the lap welding specimen close to the support bar of the specimen positioning device, ensure that the lap welding specimen is placed vertically with the left clamping module and the right clamping module, and the length of the lap welding specimen extending into the left clamping module and the right clamping module is greater than or equal to 2 / 3 of the height of the left clamping module and the right clamping module, start the tensile testing machine, and clamp the upper left end of the lap welding specimen; Adjust the height of the second clamp set of the tensile testing machine so that the lower right end of the lap welded sample extends between the second left clamp block and the second right clamp block of the second clamp set, and ensure that the length of the lap welded sample extending into the second clamp set is greater than or equal to 2 / 3 of the height of the second clamp set, start the tensile testing machine, and clamp the lower right end of the lap welded sample; Start the tensile testing machine and slowly apply axial tension until the lap welded specimen breaks, measure the tensile shear strength of the lap welded specimen, loosen the first chuck set and the second chuck set, remove the remaining sample of the lap welded specimen, and complete the test.

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