Real-time testing device for welding stress of flat weld of plate

Abstract

A kind of middle thick plate flat weld welding stress real-time testing device, including bottom plate, clamping fixture, tension sensor;First recess, second recess are opened with adjacent on bottom plate, copper plate is equipped in first recess and flush with the upper surface of bottom plate, support guide component is equipped in second recess and flush with the upper surface of bottom plate, bottom plate is equipped with boss on the side of second recess away from first recess;Clamping fixture includes front part compression part, rear part limiting part;Front part compression part is set to the front end of bottom plate and is located on the side of copper plate away from boss, rear part limiting part is set to the middle of bottom plate and is located above support guide component;Tension sensor is set to the surface of boss on the side close to copper plate.This application can measure the stress change in the process of welding in real time, accurately, find out the maximum stress point and minimum point, it is convenient to judge and analyze whether stress exceeds the yield limit of this workpiece, whether stress relief is needed.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a real-time testing device for welding stress in flat welds of medium-thick plates. Background Technology

[0002] Welding has a certain impact on material properties. The stress generated during welding affects the static strength, dimensional specifications, fatigue strength, and can lead to material failure. Excessive welding stress can cause premature failure. The internal stress generated in the weldment during welding and the changes in shape and size caused by the welding thermal process are the fundamental causes of welding stress and deformation. The non-uniform temperature field during welding and the resulting local plastic deformation and microstructure with different specific volumes are the root causes of welding stress and deformation. When the non-uniform temperature field caused by welding has not yet disappeared, the stress and deformation in the weldment are called transient welding stress and deformation; the stress and deformation after the welding temperature field disappears are called residual welding stress and deformation. Under certain conditions, welding stress and deformation can affect the function and appearance of the weldment. The presence of welding stress can affect the strength, stiffness, stability of pressure-bearing weldments, machining accuracy, dimensional stability, and corrosion resistance of the weldment, thus it is a problem that must be considered in design and manufacturing. In existing technologies, for medium and thick plates, the testing of welding residual stress is basically carried out after welding is completed, mainly using methods such as blind hole method, ultrasonic method, and coercive force method for welding stress testing and analysis. However, the above methods cannot measure welding stress in real time during the welding process, and cannot guarantee accurate measurement of welding stress after welding. This makes it impossible to effectively prevent the impact of welding stress on material life, performance, etc. Once welding is completed, large stress or residual stress is generated in the weld area, which can damage the product and is not conducive to safe use. Summary of the Invention

[0003] In order to solve the technical problems existing in the above-mentioned technologies, it is necessary to provide a real-time testing device for welding stress of flat weld seams in medium and thick plates.

[0004] A real-time testing device for welding stress of flat weld seams in medium-thick plates includes a base plate, a clamping fixture, and a tension / compression sensor. The base plate has a first groove and a second groove, which are adjacent to each other. The first groove contains a copper plate that is flush with the upper surface of the base plate, and the second groove contains a support and guide component that is flush with the upper surface of the base plate. The base plate has a boss that is parallel to the direction of the copper plate and is located on the side of the second groove away from the first groove. The clamping fixture includes a front clamping component and a rear limiting component. The front clamping component is located at the front end of the base plate and on the side of the copper plate away from the boss. The front clamping component can clamp and fix the left side medium-thick plate. The rear limiting component is located in the middle of the base plate and above the supporting and guiding component. The rear limiting component only restricts the longitudinal displacement of the right side medium-thick plate, but does not restrict the lateral displacement of the right side medium-thick plate. The tension / compression sensor is disposed on the surface of the boss near the copper plate.

[0005] Preferably, there are two rear limiting components, which are symmetrically arranged on both sides of the support and guide component along the direction of the boss. Each rear limiting component includes a support, a crossbeam, a limiting assembly, and a limiting adjustment component. The support is fixed to the base plate, and the crossbeam is rotatably connected to the end of the support near the support and guide component. The limiting assembly is disposed on the crossbeam and can be adjusted along the crossbeam. The limiting assembly only restricts the longitudinal displacement of the right-side medium-thick plate and does not restrict the lateral displacement of the right-side medium-thick plate. The limiting adjustment component can drive the crossbeam to rotate along the support.

[0006] Preferably, the limiting assembly includes a connecting rod, a locking member, and a pressure roller; the connecting rod passes through the crossbeam and is movable along the crossbeam, the locking member is fitted on the connecting rod and is located at the top and bottom of the crossbeam, and the pressure roller is rotatably disposed at the lower end of the connecting rod.

[0007] Preferably, the base plate is provided with an auxiliary limiting component, which is located on the side of the rear limiting component away from the copper plate, and the structure of the auxiliary limiting component is the same as that of the rear limiting component.

[0008] Preferably, there are two front clamping components, which are symmetrically arranged on both sides of the first groove along the setting direction of the boss. Each front clamping component includes a bracket, a support arm, a clamping assembly, and a clamping adjustment handle. The bracket is fixed to the base plate, the support arm is rotatably connected to the side of the bracket facing the copper plate, the clamping assembly is disposed on the support arm and can be adjusted along the support arm, the clamping assembly can clamp and fix the left-side medium-thick plate, and the clamping adjustment handle can drive the support arm to rotate along the bracket.

[0009] Preferably, the clamping assembly includes a connecting post, a fixing member, and a clamping end; the connecting post passes through the support arm and is movable along the support arm, the fixing member is fitted on the connecting post and is located at the upper and lower ends of the support arm, and the clamping end is fixed to the lower end of the connecting post.

[0010] Preferably, a strip-shaped through hole is provided at the bottom of the first groove, a round hole communicating with the strip-shaped through hole is provided on the side of the base plate, and a through hole corresponding to the strip-shaped through hole is provided on the copper plate.

[0011] Preferably, the support and guide component includes a support plate and support rollers; the support plate is fixed opposite to each other in the second groove and perpendicular to the boss, the support rollers are evenly distributed along the length of the support plate, and the two ends of each support roller are rotatably connected to the support plate.

[0012] As can be seen from the above technical solution, the real-time testing device for welding stress of medium-thick plate flat weld seam provided by the present invention uses a front clamping component to press and fix one of the medium-thick plates to be welded onto the base plate, while the other medium-thick plate to be welded is restricted in its longitudinal direction displacement by a rear limiting component, so that the medium-thick plate has no restriction in the transverse direction. During welding, the stress in the weld seam area changes with the non-uniform temperature field before and after welding, which causes the stress magnitude to fluctuate during the welding process, and the displacement of the medium-thick plate in the transverse direction also fluctuates. Since the front clamping component presses one of the medium-thick plates to be welded tightly, the medium-thick plate will compress the tension and compression sensor installed on the boss. Therefore, the tension and compression sensor can measure the stress change during the welding process in real time and accurately, find the stress maximum and minimum points, and facilitate the judgment and analysis of whether the stress exceeds the yield limit of the workpiece and whether stress relief is required. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a top view of the structure of the present invention.

[0016] Figure 3 This is an isometric view of one angle of the present invention.

[0017] Figure 4 This is an isometric view of the invention from another angle.

[0018] Figure 5 This is a schematic diagram of the structure of the base plate of the present invention.

[0019] Figure 6 This is a schematic diagram of the connection between the base plate and the supporting and guiding components of the present invention.

[0020] Figure 7 This is a schematic diagram of the structure of the rear limiting component of the present invention.

[0021] Figure 8 This is a schematic diagram of the front clamping component of the present invention.

[0022] Figure 9 This is a structural diagram of the present invention in use.

[0023] In the figure: base plate 01, first groove 11, strip-shaped through hole 111, second groove 12, round hole 13, boss 14, front pressing component 02, bracket 21, support arm 22, pressing assembly 23, connecting column 231, fixing component 232, pressing end 233, pressing adjustment handle 24, rear limiting component 03, support 31, crossbeam 32, limiting assembly 33, connecting rod 331, locking component 332, pressure roller 333, limiting adjustment component 34, tension and compression sensor 04, copper plate 05, through hole 51, support guide component 06, support pressure plate 61, support roller 62, auxiliary limiting component 07, left side medium-thick plate 08, right side medium-thick plate 09. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0026] Please refer to Figures 1 to 9This invention provides a real-time testing device for welding stress of flat welds in medium-thick plates, including a base plate 01, a clamping fixture, and a tension / compression sensor 04. The base plate 01 has a first groove 11 and a second groove 12, adjacent to each other. A copper plate 05, flush with the upper surface of the base plate 01, is disposed within the first groove 11, allowing the copper plate 05 to transfer heat generated during welding. A supporting and guiding component 06, flush with the upper surface of the base plate 01, is disposed within the second groove 12. A boss 14, parallel to the direction of the copper plate 05, is located on the side of the second groove 12 away from the first groove 11. The clamping fixture includes a front pressing component 02 and a rear limiting component 03. The front clamping component 02 is located at the front end of the base plate 01 and on the side of the copper plate 05 away from the boss 14. The front clamping component 02 can clamp and fix the left middle-thick plate 08. The rear limiting component 03 is located in the middle of the base plate 01 and above the support and guide component 06. The rear limiting component 03 only restricts the longitudinal displacement of the right middle-thick plate 09, but does not restrict the lateral displacement of the right middle-thick plate 09, so that there will be relative movement between the right middle-thick plate 09 and the support and guide component 06. The tension and compression sensor 04 is located on the surface of the boss 14 near the copper plate 05. The tension and compression sensor 04 can be connected to a computer or data monitoring equipment, so that the data detected by the tension and compression sensor 04 can be acquired in real time. During welding, the stress in the weld area changes with the non-uniform temperature field before and after welding, causing fluctuations in stress magnitude. This also causes fluctuations in the lateral displacement of the right-side medium-thick plate 09. Since the front clamping component 02 tightly presses down on the left-side medium-thick plate 08, the right-side medium-thick plate 09 will exert pressure on the tension / compression sensor 04 installed on the boss 14. The tension / compression sensor 04 can then measure the stress changes in real time and accurately, identify the maximum and minimum stress points, and facilitate the analysis of whether the stress exceeds the yield limit of the workpiece and whether stress relief is necessary.

[0027] In one embodiment, there are two rear limiting components 03. The two rear limiting components 03 are symmetrically arranged on both sides of the support and guide component 06 along the setting direction of the boss 14. The rear limiting component 03 includes a support 31, a crossbeam 32, a limiting component 33, and a limiting adjustment component 34. The support 31 is fixed on the base plate 01. The crossbeam 32 is rotatably connected to the end of the support 31 near the support and guide component 06. The limiting component 33 is arranged on the crossbeam 32 and can be adjusted along the crossbeam 32. The limiting component 33 only restricts the longitudinal displacement of the right middle thick plate 09 and does not restrict the lateral displacement of the right middle thick plate 09. The limiting adjustment component 34 can drive the crossbeam 32 to rotate along the support 31.

[0028] Specifically, the limiting component 33 includes a connecting rod 331, a locking element 332, and a pressure roller 333. The connecting rod 331 passes through the crossbeam 32 and can move along the crossbeam 32. The locking element 332 is fitted onto the connecting rod 331 and is located at the top and bottom of the crossbeam 32. The locking element 332 and the connecting rod 331 are connected by a thread. A shim can be added between the locking element 332 and the crossbeam 32 to ensure that the locking element 332 can firmly lock the connecting rod 331 onto the crossbeam 32. When position movement is required, the upper locking element 332 can be loosened. After the position is adjusted, the locking element 332 can be released. Simply tighten the locking part 332; during the adjustment process, the height of the connecting rod 331 can also be adjusted by adjusting the position of the upper and lower locking parts 332 to limit the longitudinal position of plates of different thicknesses; the pressure roller 333 is rotatably set at the lower end of the connecting rod 331; after the pressure roller 333 contacts the right-side medium-thick plate 09, during the welding process, when the right-side medium-thick plate 09 fluctuates, the pressure roller 333 will follow the fluctuation of the right-side medium-thick plate 09 and rotate freely, which can reduce the frictional resistance between the right-side medium-thick plate 09 and the pressure roller 333, so as to ensure that the tension and compression sensor 04 can obtain more accurate measurement values.

[0029] In one embodiment, an auxiliary limiting component 07 is provided on the base plate 01. The auxiliary limiting component 07 is located on the side of the rear limiting component 03 away from the copper plate 05, and the structure of the auxiliary limiting component 07 is the same as that of the rear limiting component 03. The auxiliary limiting component 07 can effectively limit the longitudinal displacement of the left side of the medium-thick plate 08 away from the front pressing component 02. After lateral fluctuation occurs during the welding of the right side medium-thick plate 09, it can effectively ensure that the right side medium-thick plate 09 can have a stable and straight lateral fluctuation trajectory in the lateral direction, so as to ensure that the tension and compression sensor 04 can obtain more accurate measurement values.

[0030] In one embodiment, there are two front clamping components 02. The two front clamping components 02 are symmetrically arranged on both sides of the first groove 11 along the setting direction of the boss 14. The front clamping component 02 includes a bracket 21, a support arm 22, a clamping assembly 23, and a clamping adjustment handle 24. The bracket 21 is fixed on the base plate 01. The support arm 22 is rotatably connected to the side of the bracket 21 facing the copper plate 05. The clamping assembly 23 is arranged on the support arm 22 and can be adjusted along the support arm 22. The clamping assembly 23 can clamp and fix the left side medium-thick plate 08. The clamping adjustment handle 24 can drive the support arm 22 to rotate along the bracket 21.

[0031] Specifically, the clamping assembly 23 includes a connecting post 231, a fixing member 232, and a clamping end 233. The connecting post 231 passes through the support arm 22 and can move along the support arm 22. The fixing member 232 is fitted onto the connecting post 231 and is located at the upper and lower ends of the support arm 22. The fixing member 232 and the connecting post 231 are connected by threads. A washer can also be added between the fixing member 232 and the support arm 22 to ensure that the fixing member 232 can firmly lock the connecting post 231 onto the support arm 22 and allow for positional movement as needed. When adjusting, the upper fixing part 232 can be loosened, and after the position is adjusted, the fixing part 232 can be tightened again. During the adjustment process, the height of the connecting column 231 can also be adjusted by adjusting the position of the upper and lower fixing parts 232 to achieve pressing and fixing of plates of different thicknesses. The pressing end 233 is fixed at the lower end of the connecting column 231. The pressing end 233 is made of rubber, which can ensure that there is a large friction between the pressing end 233 and the left medium-thick plate 08, and prevent scratches on the surface of the left medium-thick plate 08.

[0032] In one embodiment, a strip-shaped through hole 111 is provided at the bottom of the first groove 11, and a round hole 13 communicating with the strip-shaped through hole 111 is provided on the side of the base plate 01. A through hole 51 corresponding to the strip-shaped through hole 111 is provided on the copper plate 05. The through hole 51 and the strip-shaped through hole 111 can accelerate the dissipation of heat generated during welding. Furthermore, the round hole 13, the strip-shaped through hole 111, and the through hole 51 on the copper plate 05 can facilitate the introduction of shielding gas during welding. The shielding gas can not only provide welding protection but also remove the heat generated during welding from the strip-shaped hole and the through hole 51.

[0033] In one embodiment, the support guide component 06 includes a support plate and support rollers 62. The support plate is fixed opposite to each other in the second groove 12 and perpendicular to the boss 14. The support rollers 62 are evenly distributed along the length of the support plate, and the two ends of each support roller 62 are rotatably connected to the support plate. When welding two medium-thick plates, when the right medium-thick plate 09 fluctuates due to welding stress, the pressure roller 333 and the support roller 62 work together to allow the pressure roller 333 and the support roller 62 to rotate freely following the fluctuation of the right medium-thick plate 09. This not only reduces the frictional resistance of the upper and lower surfaces of the right medium-thick plate 09, but also ensures that the right medium-thick plate 09 has a stable and straight lateral fluctuation trajectory, so as to ensure that the tension and compression sensor 04 can obtain more accurate measurement values.

[0034] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A real-time testing device for welding stress in flat welds of medium-thick plates, characterized in that: Includes base plate, clamping fixture, and tension / compression sensor; The base plate has a first groove and a second groove, which are adjacent to each other. The first groove contains a copper plate that is flush with the upper surface of the base plate, and the second groove contains a support and guide component that is flush with the upper surface of the base plate. The base plate has a boss that is parallel to the direction of the copper plate and is located on the side of the second groove away from the first groove. The clamping fixture includes a front clamping component and a rear limiting component. The front clamping component is located at the front end of the base plate and on the side of the copper plate away from the boss. The front clamping component can clamp and fix the left side medium-thick plate. The rear limiting component is located in the middle of the base plate and above the supporting and guiding component. The rear limiting component only restricts the longitudinal displacement of the right side medium-thick plate, but does not restrict the lateral displacement of the right side medium-thick plate. The tension / compression sensor is disposed on the surface of the boss near the copper plate. There are two rear limiting components, which are symmetrically arranged on both sides of the support guide component along the direction of the boss. Each rear limiting component includes a support, a crossbeam, a limiting assembly, and a limiting adjustment component. The support is fixed to the base plate, and the crossbeam is rotatably connected to the end of the support near the support guide component. The limiting assembly is arranged on the crossbeam and can be adjusted along the crossbeam. The limiting assembly only restricts the longitudinal displacement of the right middle-thick plate and does not restrict the lateral displacement of the right middle-thick plate. The limiting adjustment component can drive the crossbeam to rotate along the support. There are two front clamping components, which are symmetrically arranged on both sides of the first groove along the direction of the boss. Each front clamping component includes a bracket, a support arm, a clamping assembly, and a clamping adjustment handle. The bracket is fixed to the base plate, and the support arm is rotatably connected to the side of the bracket facing the copper plate. The clamping assembly is arranged on the support arm and can be adjusted along the support arm. The clamping assembly can clamp and fix the left-side medium-thick plate. The clamping adjustment handle can drive the support arm to rotate along the bracket.

2. The real-time testing device for welding stress of flat weld seams in medium-thick plates according to claim 1, characterized in that: The limiting assembly includes a connecting rod, a locking element, and a pressure roller; the connecting rod passes through the crossbeam and can move along the crossbeam, the locking element is fitted on the connecting rod and is located at the top and bottom of the crossbeam, and the pressure roller is rotatably disposed at the lower end of the connecting rod.

3. The real-time testing device for welding stress of flat weld seams in medium-thick plates according to claim 2, characterized in that: The base plate is provided with an auxiliary limiting component, which is located on the side of the rear limiting component away from the copper plate. The structure of the auxiliary limiting component is the same as that of the rear limiting component.

4. The real-time testing device for welding stress of flat weld seams in medium-thick plates according to claim 3, characterized in that: The clamping assembly includes a connecting post, a fixing member, and a clamping end; the connecting post passes through the support arm and can move along the support arm, the fixing member is fitted on the connecting post and is located at the upper and lower ends of the support arm, and the clamping end is fixed to the lower end of the connecting post.

5. The real-time testing device for welding stress of flat weld seams in medium-thick plates according to claim 3, characterized in that: The bottom of the first groove is provided with a strip-shaped through hole, and a round hole communicating with the strip-shaped through hole is provided on the side of the base plate. A through hole corresponding to the strip-shaped through hole is provided on the copper plate.

6. The real-time testing device for welding stress of flat weld seams in medium-thick plates according to claim 2, characterized in that: The support and guide component includes a support plate and support rollers; the support plate is fixed in opposite directions in the second groove and perpendicular to the boss, and the support rollers are evenly distributed along the length of the support plate, and the two ends of each support roller are rotatably connected to the support plate.

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