Restraint device for controlling size of manual electric arc welding bead of NDT sample
By using plate-type restraint and pure copper plate-type restraint, the problem of welding bead size and position control in manual welding NDT samples is solved, and the uniformity of welding beads and efficient welding is achieved, reducing the occurrence of welding defects .
Patent Information
- Application Number
- CN202421040488.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-14
AI Technical Summary
At this stage, when manual welding of NDT samples, the length, width and height of the weld bead cannot be unified, and the position of the weld bead relative to the sample cannot be controlled, which is prone to welding defects.
A plate-type restraint is adopted, with welding operation holes and observation holes, used to embed the sample and ensure the consistency of welding position, the slot is used to fix the sample, and pure copper material is used to avoid adhesion with the molten pool, ensuring the welding duct Size and position.
The uniformity of the bead size and position control are achieved, the difficulty of welding is reduced, the pass rate and production efficiency are improved, and the welding defects during arc collection are reduced.
Smart Images
Figure CN222243047U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of plate welding experiments, in particular to a restrainer for controlling the size of a manual arc welding weld of an NDT sample. Background Art
[0002] Nuclear power steel has certain special requirements in inspection, and must be subjected to a non-plastic transition temperature drop hammer test, referred to as NDT inspection. NDT inspection is to apply a single impact load to each specimen in a group of specimens of a given material at a series of selected temperatures to determine the highest brittle transition temperature when the specimen breaks. Or test whether the material can withstand a specified impact load at a certain temperature. This specimen requires special processing, welding a crack source weld in the middle of the specimen, and artificially creating a crack source to play a role in inducing cracks, and observe the crack expansion after the drop hammer hit.
[0003] In order to obtain accurate experimental data, the inspection standard GB / T6803-2008 stipulates that NDT specimens must be welded manually, and has strict requirements on welding current, welding speed, welding temperature, weld size, internal quality, etc. However, at present, when manually welding NDT specimens, the length, width, and height of the weld cannot be unified, the position of the weld relative to the specimen cannot be controlled, and welding defects are prone to occur when the arc is closed. Utility Model Content
[0004] In order to overcome the deficiencies of the prior art, the utility model provides a restraint for controlling the size of the manual arc welding bead of the NDT specimen, which not only ensures the size of the weld bead, but also ensures the position of the weld bead relative to the specimen, and at the same time, it is not easy to produce welding defects when the arc is closed.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A restraint for controlling the size of a manual arc welding bead of an NDT specimen, wherein the restraint is in a plate shape; a welding operation hole is provided at the center of the restraint, and the welding operation hole is a through hole; observation holes are provided on both sides of the restraint, and the observation holes are notches; and a clamping slot matching the specimen is provided on the restraint for clamping the specimen.
[0007] Furthermore, the restraint is a rectangular plate, and the sample is a rectangular test plate.
[0008] Furthermore, the welding operation hole is rectangular in the middle and semicircular at both ends.
[0009] Furthermore, the observation hole is a semicircular notch.
[0010] Furthermore, the depth of the card slot is greater than 5 mm.
[0011] Furthermore, the restraint is made of pure copper, and the copper content of the pure copper is more than 99.5% by weight.
[0012] Compared with the prior art, the utility model has at least the following technical effects or advantages:
[0013] 1. Before welding, place the restraint on the test plate, embed the test plate into the slot of the restraint, and weld the electrode in the welding operation hole. Since pure copper will not adhere to the molten iron in the molten pool, the outline size of the restraint slot after welding is the size of the weld. It not only guarantees the size of the weld, but also guarantees the position of the weld relative to the test plate. In batch welding, the uniformity of the weld of the test plate is improved, the welding difficulty is reduced, and the qualified rate of the sample welding is increased, which is conducive to improving the welding success rate and production efficiency.
[0014] 2. When the arc is closed, due to the limitation of the welding operation hole, there is no need to consider that the molten pool will become wider when the arc is closed. There can be sufficient time to perform the arc closing action, which can ensure that the slag floats fully and it is not easy to produce welding defects when the arc is closed. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.
[0016] Figure 2 It is a three-dimensional structural schematic diagram of the utility model from another angle.
[0017] Figure 3 It is a schematic diagram of the working state of the utility model.
[0018] Figure 4 yes Figure 3 AA section view.
[0019] Figure 5 yes Figure 3 BB cross-sectional view.
[0020] In the figure:
[0021] 1-Test plate 2-Welding operation hole 3-Observation hole 4-Slot DETAILED DESCRIPTION
[0022] The embodiments of the present invention are described in detail below. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0025] In the description of the utility model, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0028] [Example]
[0029] like Figure 1-5 As shown, the utility model is a manual weld restraint for GB6803-1986-ferritic steel non-plastic transition temperature drop hammer P2, P3 specimens, and the test plate 1 used for NDT inspection is a rectangular plate with a length of 130mm and a width of 50mm.
[0030] The utility model is made of pure copper, and the weight percentage of copper in the chemical composition is above 99.9%.
[0031] The utility model is a rectangular plate with a length of 145 mm, a width of 65 mm and a thickness of 9 mm. A welding operation hole 2 with a length of 50 mm, a width of 13 mm, a middle rectangle and semicircular ends is arranged in the center.
[0032] A groove 4 of 131 mm long × 51 mm wide × 6 mm deep is provided on the back, so that four edges of 6 mm high and 7 mm wide are formed on the back of the restraint device, which can just hold the test plate 1, ensuring easy placement and no movement when in use.
[0033] The tail is provided with two semicircular observation holes 3 with a radius of 10 mm, and the observation holes 3 are openings (notches). The relative positions of the test plate 1 and the restraint can be observed through the observation holes 3. During welding, if the test plate 1 is stuck to the restraint due to thermal expansion, the test plate 1 can be knocked at the observation holes 3 to separate it from the restraint.
[0034] The working principle and working process of the utility model are as follows:
[0035] 1. Before welding, place the restraint on the test plate 1 so that the test plate 1 fits neatly into the groove 4 of the restraint, and calibrate the relative position of the test plate 1 and the restraint through the two semicircular observation holes 3.
[0036] 2. Start welding. According to the welding standard for P3 sample in GB / T6803-2008, adjust the welding current to 180A. Use Atlantic φ4mm cladding electrode (CHR127). Dry it at 180℃ for 2h before welding and put it into a heat preservation bucket for easy use.
[0037] 3. Welding is carried out from left to right. The arc is ignited at 10mm from the left edge of the welding operation hole. After preheating the test plate for 1S with a medium-long arc, the arc is pulled to the leftmost side of the welding operation hole 2 and the arc is lowered to start welding. During the welding process, the edge and thickness of the welding operation hole 2 are used as a reference to ensure the straightness and height of the weld.
[0038] The edge of the weld is limited by the size of the constraint hole (welding operation hole 2) to ensure that the length and width of all welds welded in the constraint hole remain consistent.
[0039] 4. When closing the arc, there is no need to break the arc. Just re-weld 10mm directly. When the molten iron fills the arc pit, you can close the arc.
[0040] The utility model not only ensures the size of the weld bead, but also ensures the position of the weld bead relative to the test plate 1. The uniformity of the test plate weld bead is improved during batch welding, the welding difficulty is reduced, the qualified rate of the sample welding is improved, and the welding success rate and production efficiency are improved. When the arc is closed, due to the limitation of the welding operation hole 2, there is no need to consider that the molten pool will become wider when the arc is closed, and there can be sufficient time to perform the action of continuous arc closing, so that the slag can be fully floated and it is not easy to produce welding defects when the arc is closed.
[0041] The protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent substitutions or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A restraint for controlling the size of a manual arc welding bead of an NDT specimen, characterized in that: The restraint is a plate type; The restrainer is provided with a welding operation hole at the center, and the welding operation hole is a through hole; Observation holes are provided on both sides of the restrainer, and the observation holes are notches; The restrainer is provided with a clamping groove matched with the sample and used for clamping the sample.
2. A restraint for controlling the size of a manual arc welding bead of an NDT specimen according to claim 1, characterized in that: The restrainer is a rectangular plate, and the sample is a rectangular test plate.
3. A restraint for controlling the size of a manual arc welding bead of an NDT specimen according to claim 1, characterized in that: The welding operation hole is rectangular in the middle and semicircular at both ends.
4. A restraint for controlling the size of a manual arc welding bead of an NDT specimen according to claim 1, characterized in that: The observation hole is a semicircular notch.
5. A restraint for controlling the size of a manual arc welding bead of an NDT specimen according to claim 1, characterized in that: The depth of the card slot is above 5 mm.
6. A restraint for controlling the size of a manual arc welding bead of an NDT specimen according to claim 1, characterized in that: The restraint is made of pure copper material, and the weight percentage of copper in the chemical composition is above 99.9%.