A tool for welding stud bending test

Abstract

The present invention discloses a tool for stud welding bending test, which solves the problems of reducing test costs, saving tooling production, and simplifying the fixing of stud welding. The present invention comprises a top plate and a wedge-shaped pad; a through hole is opened in the middle of the top plate, the through hole is adapted to the weld scar between the stud welding stud and the welded part in the sample to be tested, and the through hole is used to fit the stud welding stud in the sample to be tested; the number of the wedge-shaped pads is an even number, all the wedge-shaped pads are arranged in contact with each other along the normal direction of the top plate surface, the planes on all the wedge-shaped pads that are opposite to the wedge-shaped surfaces are parallel to the top plate surface, and along the arrangement direction of the wedge-shaped pads, the wedge-shaped surfaces of every two wedge-shaped pads overlap. The present invention has the advantages of low cost, convenient testing, and easy production.

Description

Technical Field

[0001] The invention relates to the technical field of stud performance detection, and in particular to a tooling for a welding stud bending test. Background Art

[0002] Welding nails are a kind of fasteners with high strength and rigidity, with a nominal diameter of Φ10~Φ25mm and a total length of 40~300mm before welding. Welding nails are widely used in the construction of nuclear power plants. In order to ensure the safety of the entire nuclear power project, reliable welding nails are required. Therefore, welding nails need to be tested as necessary, and the most important indicator is their mechanical properties, mainly including tensile test and bending test.

[0003] For the bending test, Appendix A of GB / T 10433-2002 "Cylindrical Head Studs for Arc Stud Welding" currently stipulates: For studs with d≤22mm, a bending test can be performed on the welding end. The test can be performed by hitting the head of the stud specimen with a hammer (or using a sleeve to press) to bend it 30°. It is qualified if no cracks are visible to the naked eye; according to AWSD1.1 / D1.1M:2010 (7.6.6.1) "Welded Joint Bending Test Method", the stud is bent 90° from its original axis, and the fracture occurs on the steel plate or profile, or on the stud body but not on the weld. According to HAF603-2019, the stud is bent by not less than 15° with a sleeve of corresponding specifications, and then restored to its original position. After the crack-free test of the weld and heat-affected zone of each stud, no cracks visible to the naked eye should be generated in the weld and heat-affected zone of the specimen. When using a sleeve for testing, the distance between the lower end of the sleeve and the upper end of the weld metal shall not be less than 1d. (Note: d is the diameter of the weld nail.)

[0004] At present, universal testing machines or other fixing devices are mostly used to fix the test pieces during the test, which takes a long time and the test pieces are easy to loosen, resulting in low detection efficiency and even certain dangers. The prior art also provides a test fixture installed on an inclined surface, and the fixture base is welded to the welding nails, and then the pressure test is carried out by a universal testing machine. Since the fixture needs to be welded to the welding nails, the number of uses is limited, and the material inside the base after welding will also be affected, resulting in the strength of the welding point when the next welding nail is welded is different from the normal welding, and when multiple welding nails need to be tested, multiple fixtures are required, which increases the production cost of the fixture. Summary of the invention

[0005] The technical problem to be solved by the present invention is to reduce the manufacturing cost of tooling and simplify the welding stud bending test process. The present invention provides a tooling for welding stud bending test which solves the above problems.

[0006] The present invention is achieved through the following technical solutions:

[0007] A tool for stud welding stud bending test, comprising a top plate and a wedge-shaped pad; a through hole is opened in the middle of the top plate, the through hole is adapted to the weld scar between the stud welding stud and the welded part in the test sample, and the through hole is used to cover the stud welding stud in the test sample; the number of the wedge-shaped pads is an even number, all the wedge-shaped pads are arranged in contact with each other along the normal direction of the top plate surface, the planes on all the wedge-shaped pads that are opposite to the wedge-shaped surfaces are parallel to the top plate surface, and along the arrangement direction of the wedge-shaped pads, the wedge-shaped surfaces of every two wedge-shaped pads overlap; in the working state, the end surface of the top plate is connected to the test platform by connecting The parts to be tested are connected, there is a gap between the connected top plate and the test platform and the top plate surface is parallel to the test platform, the free end of the stud welding nail in the test sample passes through the top plate through-hole from the test platform toward the top plate and the weld scar is located in the through-hole, the welded part in the test sample is blocked by the top plate on one side of the top plate surface, the wedge-shaped pad is placed between the welded part and the test platform, the wedge-shaped pad is adjusted to increase the total overlapping area of ​​the wedge surface, until the welded part in the test sample is clamped by the wedge-shaped pad and the top plate, and then the bending test is carried out according to the test specification using a hand hammer or a sleeve.

[0008] According to the steel structure construction quality acceptance specification, the use of welding nails must be tested for welding nail bending before use. In most construction environments, there is currently no dedicated welding nail fixture, and the test is usually carried out on a universal testing machine. However, for engineering environments where welding nails are used in small quantities, setting up a universal testing machine for a temporary welding nail bending test is undoubtedly not worth the cost. In actual projects, there are also methods of welding welding nails to the base and then conducting a bending test on them, but this method obviously wastes tooling materials.

[0009] The invention has a simple structure. The top plate can be made of a steel plate on site, and then a hole is made in the middle of the steel plate. The wedge-shaped pad can use a standard part or select two steel cuboids on site to process the inclined surface. Both the top plate and the wedge-shaped pad can be made of waste materials on site, and the processing steps are relatively simple and time-saving. In some working conditions where the amount of stud welds is small or the frequency of use is extremely low, the use of the present invention to perform stud weld bending tests can greatly save costs and a lot of time: generally, there are few universal testing machines specially set up on site. The use of the present invention avoids fixed-point tests, saving transportation costs and transportation time; when the wedge-shaped pad is adjusted, the height of the wedge-shaped pad is determined by the overlapping area of ​​the wedge surfaces, and the adjustment of the height of the wedge-shaped pad is stepless, which avoids the situation where the welded parts are not clamped tightly enough.

[0010] Preferably, it includes a top plate support member; one end of the top plate support member is connected to the end face of the top plate located on one side of the through hole, and the end of the top plate support member opposite to the top plate is used to connect to the test platform; the provision of the top plate support member facilitates the connection between the top plate and the test platform, and the top plate support member can use components that are easily obtained on site, such as sleeves, rectangular tubes or square blocks, and the test platform can be a machine tool platform or the ground or a hard plane, etc. Different top plate support members are used to facilitate the adaptation and connection of the top plate with different test platforms, so that the test is not affected by the test environment, and at the same time, the top plate is prevented from being damaged when connected to different test platforms.

[0011] Furthermore, it also includes a bottom plate, which is connected to the top plate support member, the top plate surface is parallel to the bottom plate surface, and the wedge-shaped pad is located on the bottom plate surface and between the bottom plate and the top plate; after the bottom plate is set, the main function of the top plate support member is to create a gap between the top plate and the bottom plate. At this time, the length of the top plate support member in the normal direction of the top plate surface can take a larger value, so as to adapt to stud welds of different lengths, so that the test can be carried out normally, and the setting of the bottom plate makes the test applicable to a wider range of environments, and the setting of the bottom plate can also effectively provide support for the wedge-shaped pad.

[0012] Preferably, the through hole diameter is 35 mm. After the stud welding nail is welded to the welded part, the diameter of the weld scar produced is generally 32-35 mm, so the through hole diameter is set to 35 mm to adapt to all specifications of stud welding nails.

[0013] Preferably, the through hole extends along a radial direction of the through hole to the end surface of the top plate to form a notch; the setting of the notch makes it more convenient to match the sample to be tested with the top plate, that is, keep the axis of the stud weld perpendicular to the surface of the top plate, and then make the stud weld pass through the notch and be located in the through hole. This matching method is more convenient and has lower space requirements under the top plate.

[0014] Furthermore, the width of the gap is 25 mm; the maximum specification of the stud welding nail is a rod diameter of 25 mm, and the gap is set to a width of 25 mm so that the gap can pass through stud welding nails of various specifications.

[0015] Preferably, the angle between the wedge surface of the wedge-shaped pad and the bottom surface of the wedge-shaped pad is 6°; the setting of the angle makes the slope of the wedge-shaped pad height increase smaller, so that when adjusting the same height, the overlapping area of ​​the wedge-shaped pads with a small angle is larger, and the wedge-shaped pads are more stable during testing.

[0016] The present invention has the following advantages and beneficial effects:

[0017] 1. The present invention realizes stepless adjustment by adjusting the overlapping area between the wedge-shaped pads. The total height of the wedge-shaped pads is proportional to the overlapping area of ​​the wedge surfaces, so that the sample to be tested is stably clamped, ensuring the stability of the sample to be tested during the test, making the test results more credible and accurate.

[0018] 2. The materials used in the present invention are easy to obtain and can be found everywhere at general construction sites, which provides great convenience for temporary test needs. Even waste materials can be used in the production, achieving the effect of waste recycling.

[0019] 3. The present invention has a simple structure, and each component is easy to process, requiring little time, and is quick to manufacture, thus saving time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the present invention when in use.

[0023] Figure 3 It is a structural schematic diagram of an implementation mode of the present invention.

[0024] Figure 4 It is a structural schematic diagram of an implementation mode of the present invention.

[0025] Figure 5 Schematic diagram of the structure of the sample to be tested.

[0026] Marks and corresponding parts names in the attached drawings:

[0027] 1-top plate, 2-wedge-shaped pad, 3-through hole, 4-notch, 5-top plate support, 6-bottom plate, 7-sample to be tested, 8-stud welding nail, 9-welded part, 10-connecting part, 11-test platform. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary implementation modes of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, a tool for welding stud bending test includes a top plate 1 and a wedge-shaped pad 2. A circular through hole 3 is opened in the middle of the top plate 1. Two wedge-shaped pads 2 are arranged in the direction opposite to the lower plate surface of the top plate 1. The wedge surfaces of the two wedge-shaped pads 2 overlap. The normal lines of the wedge surfaces of the wedge blocks 2 pass through the plate surface of the top plate 1 and the ground on the wedge blocks 2 opposite to the wedge surfaces is parallel to the plate surface of the top plate 1.

[0031] When the present invention is used, Figure 2 As shown, a connector with a certain length can be selected on site. When the length of the connector is less than the length of the piece to be tested in the direction of the stud welding axis: first, the stud welding of the piece to be tested is passed through the through hole of the top plate, and then the connector is used to connect the end faces on either side of the axis of the through hole of the top plate, and then the connector is fixed on the test platform, and then the wedge-shaped pad is placed between the top plate and the test platform, so that the welded part in the sample to be tested is located between the wedge-shaped pad and the top plate, and the overlapping area of ​​the wedge surface of the wedge-shaped pad is adjusted to increase the total height of the wedge-shaped pad, so that the welded part in the sample to be tested is clamped; when the length of the connector is less than the length of the piece to be tested in the direction of the stud welding axis: the top plate can be connected to the test platform through the connector first, and then the sample to be tested and the wedge-shaped pad are installed.

[0032] The present invention realizes stepless adjustment by adjusting the overlapping area between the wedge-shaped pads. The total height of the wedge-shaped pads is proportional to the overlapping area of ​​the wedge surfaces, so that the sample to be tested is stably clamped, the stability of the sample to be tested during the test is guaranteed, and the test result is more credible and accurate; the structure is simple and easy to implement.

[0033] Example 2

[0034] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that the diameter of the through hole 3 on the top plate 1 is set to 35 mm, the end face of one end of the axis of the through hole of the top plate 1 is connected to the top plate support 5, the through hole 3 on the top plate 1 extends along the radial direction of the through hole 3 to the end face of the top plate 1 to form a notch 4, the width of the notch 4 is set to 25 mm, and the opening direction of the notch 4 is parallel to the intersection line of the top plate 1 and the top plate support 5.

[0035] The setting of the through hole and the notch size makes the tooling suitable for stud welding nails of existing specifications. The setting of the top plate support makes the tooling applicable to a wider range of use environments and eliminates the need for repeated fixation of the top plate and the connecting piece before the test. The setting of the notch makes the matching mode between the test sample and the top plate: the axis of the stud welding nail is kept parallel to the normal direction of the top plate surface, and the stud welding nail is moved from the notch to the through hole. With this matching mode, the length of the top plate support can be set smaller, so that when the test is carried out, the force arm of the top plate support is smaller, preventing the top plate support from being damaged. At the same time, the stability of the top plate support also makes the test more stable and the test results more accurate.

[0036] Example 3

[0037] like Figure 4As shown, this embodiment is an improvement on the embodiment 2, the top plate support member 5 is a square plate, the two top plate support members 5 are respectively connected to the end faces on both sides of the axis of the through hole 3 on the top plate 1, the extension direction of the notch 4 on the top plate 1 is parallel to the plate surface of the top plate support member 5, the top plate 1 and the top plate support member 5 together form a square through hole, a wedge-shaped pad 2 is placed in the square through hole, a bottom plate 6 is fixedly connected to the lower end of the top plate support member 5, and connecting holes are also opened near the four corner points of the bottom plate 6.

[0038] This embodiment is an improvement on Embodiment 2. The provision of two top plate supports increases the stability of the tooling and makes the tooling have a stronger load-bearing capacity. At the same time, the wedge-shaped pads are limited to prevent the wedge-shaped pads from accidentally collapsing. The top plate and the top plate supports can be connected by welding to ensure the connection strength. The provision of the bottom plate makes it unnecessary to consider the flatness and hardness of the ground or other platforms when using the tooling. The provision of the bottom plate connecting holes facilitates the fixation of the tooling. For example, expansion bolts can be used to pass through the connecting holes to fix the tooling to the ground, which facilitates the test and avoids wasting test preparation time by looking for a test platform.

[0039] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tool for stud welding bending test, characterized in that: It comprises a top plate (1) and a wedge-shaped pad (2); A through hole (3) is formed in the middle of the top plate (1), the through hole (3) is adapted to the weld scar between the stud welding nail (8) in the sample to be tested (7) and the welded part (9), and the through hole (3) is used to fit the stud welding nail (8) in the sample to be tested (7); The number of the wedge-shaped pads (2) is an even number, all the wedge-shaped pads (2) are arranged in contact with each other along the normal direction of the plate surface of the top plate (1), the planes on all the wedge-shaped pads (2) that are opposite to the wedge-shaped surfaces are parallel to the plate surface of the top plate (1), and along the arrangement direction of the wedge-shaped pads (2), the wedge-shaped surfaces of every two wedge-shaped pads (2) overlap; In the working state, the end face of the top plate (1) is connected to the test platform (11) through a connecting piece (10). After the connection, there is a gap between the top plate (1) and the test platform (11) and the plate surface of the top plate (1) is parallel to the test platform (11). The free end of the stud welding nail (8) in the test sample (7) passes through the through hole (3) of the top plate (1) from the test platform (11) toward the top plate (1) and the weld scar is located in the through hole (3). The welded part (9) in the test sample (7) is blocked by the top plate (1) on one side of the plate surface of the top plate (1). The wedge-shaped pad (2) is placed between the welded part (9) and the test platform (11). The wedge-shaped pad (2) is adjusted to increase the total overlap area of ​​the wedge surface until the welded part (9) in the test sample (7) is clamped by the wedge-shaped pad (2) and the top plate (1). Then, a bending test is performed according to the test specification using a hand hammer or a sleeve.

2. A tool for stud welding bending test according to claim 1, characterized in that: It includes a top plate support member (5); One end of the top plate support member (5) is connected to an end surface of the top plate (1) located on one side of the through hole (3), and the end of the top plate support member (5) opposite to the top plate (1) is used to connect to the test platform (11).

3. A tool for stud welding bending test according to claim 2, characterized in that: It also includes a bottom plate (6), the bottom plate (6) is connected to the top plate support (5), the top plate (1) surface is parallel to the bottom plate (6) surface, and the wedge-shaped pad (2) is located on the bottom plate (6) surface and between the bottom plate (6) and the top plate (1).

4. A tool for stud welding bending test according to claim 1, characterized in that: The through hole (3) has a diameter of 35 mm.

5. A tool for stud welding bending test according to claim 1, characterized in that: The through hole (3) extends along a radial direction of the through hole (3) to the end surface of the top plate (1) to form a notch (4).

6. A tool for stud welding bending test according to claim 5, characterized in that: The width of the notch (4) is 25 mm.

7. A tool for stud welding bending test according to claim 1, characterized in that: The angle between the wedge surface of the wedge-shaped pad (2) and the bottom surface of the wedge-shaped pad (2) is 6°.

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