A welding method for a narrow strip support mechanism

Abstract

The application discloses a welding method for a narrow strip-shaped support mechanism, and the method comprises the following steps: spot welding a lattice limiting support and a lattice limiting seat to be fixedly connected to form a group of support mechanisms; oppositely assembling and welding the lattice limiting seats of two groups of support mechanisms to be fixed; welding a first deformation control sub-block to the inner side of the lattice limiting support to position the lattice limiting support; welding a second deformation control sub-block to connect the lattice limiting support and the lattice limiting seat to position the lattice limiting support and the lattice limiting seat; and performing sectional welding on the lattice limiting support and the lattice limiting seat in the same group of support mechanisms. According to the welding method, the lattice limiting support and the lattice limiting seat are positioned by the deformation control sub-block, the lattice limiting seats of the two groups of support mechanisms are welded to be fixed, and the lattice limiting support and the lattice limiting seat are welded by the sectional welding mode, so that the deformation amount of the lattice limiting support and the lattice limiting seat after welding caused by the traditional welding method is reduced.

Description

Technical Field

[0001] This invention relates to a welding method for a narrow strip support mechanism. Background Technology

[0002] In the field of nuclear fuel cycle, the sealed containers of high burnup spent fuel dry storage and transportation equipment typically employ stainless steel grid limit supports and grid limit seats as internal support structures. For example... Figure 1 As shown, the grid limiting support is a U-shaped structure, formed by bending a plate of a certain thickness. The grid limiting seat is a long strip plate, welded to the top of the U-shaped grid limiting support. However, this structure has technical problems in the welding process: during continuous welding on both sides of the grid limiting seat, longitudinal bending deformation occurs due to shrinkage stress. Simultaneously, the opening angle of the U-shaped grid limiting support expands due to welding heat input, causing the grid limiting seat and grid limiting support to deform as follows... Figure 1 The deformation or deformation trend indicated by the direction of the middle arrow.

[0003] These combined deformations severely affect the positioning accuracy of the support mechanism and the operational reliability of the equipment. Traditional welding processes are difficult to effectively control such deformations; therefore, there is an urgent need to develop a systematic welding deformation control method to meet the stringent dimensional accuracy requirements of the equipment.

[0004] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a welding method for narrow strip support mechanisms, which has the advantage of minimal deformation after welding.

[0006] To achieve the above objectives, the present invention provides a welding method for a narrow strip-shaped support mechanism, the narrow strip-shaped support mechanism comprising a curved grid limiting support and a flat grid limiting seat, the welding method employing multiple first deformation control sub-blocks and multiple second deformation control sub-blocks to assist in positioning the grid limiting support and the grid limiting seat; the welding method includes:

[0007] S10. Spot weld the grid limit support and the grid limit seat together to form a set of support mechanisms.

[0008] S20. The grid limiting seats of the two sets of support mechanisms are assembled, welded and fixed relative to each other;

[0009] S30. The first deformation control sub-block is welded to the inner side of the grid limit support to position the grid limit support; the second deformation control sub-block is welded to connect the grid limit support and the grid limit seat to position the grid limit support and the grid limit seat.

[0010] S40. The grid limiting support and the grid limiting seat in the same group of support mechanisms are welded in sections.

[0011] Optionally, in step S40, the entire length of the grid limiting support is divided into 8 to 12 welding segments for segmented welding.

[0012] Optionally, the number of welded segments in the segmented welding is 10.

[0013] Optionally, the plurality of welding segments are arranged sequentially along the length direction of the grid limiting seat, and when welding each welding segment, welding is performed from the side of each welding segment away from the midpoint of the grid limiting seat to the side closer to the midpoint of the grid limiting seat.

[0014] Optionally, the welded segments located on both sides of the midpoint of the grid limiting seat are welded alternately.

[0015] Optionally, the welding segments located on both sides of the midpoint of the grid limiting seat are staggered during welding.

[0016] Optionally, the grid limiting support and the grid limiting seat are simultaneously welded on both sides of the grid limiting support.

[0017] Optionally, in step S30, the first deformation control sub-block disposed within the grid limiting support and the two second deformation control sub-blocks connecting the grid limiting support and the grid limiting seat constitute a set of deformation control components. Along the length direction of the grid limiting seat, the number of deformation control components is the same as the number of welding segments.

[0018] Optionally, the first deformation control sub-block of the same set of deformation control components is closer to the midpoint of the grid limit seat than the second deformation control sub-block.

[0019] Optionally, after step S40, the method further includes step S50, which involves removing and separating the grid limiting seats of the two sets of support mechanisms.

[0020] In summary, compared with the prior art, the welding method for narrow strip support mechanisms provided by the present invention has the following beneficial effects:

[0021] The welding method for narrow strip support mechanisms of the present invention uses deformation control sub-blocks to position grid limit supports and grid limit seats, and welds and fixes the grid limit seats of the two sets of support mechanisms. The grid limit supports and grid limit seats are welded in a segmented welding manner, which reduces the deformation of grid limit supports and grid limit seats after welding caused by traditional welding methods. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the deformation that occurs when welding a support mechanism in the prior art.

[0023] Figure 2 This is a flowchart of the welding method of this application.

[0024] Figure 3 This is a schematic diagram of the grid limit seats of the two sets of support mechanisms after welding and fixing in the embodiments of this application.

[0025] Figure 4 This is a side view of two sets of support mechanisms equipped with a first deformation control sub-block and a second deformation control sub-block in an embodiment of this application.

[0026] Figure 5 This is a front view of the two sets of support mechanisms equipped with the first deformation control sub-block and the second deformation control sub-block in the embodiment of this application.

[0027] Figure 6 This is a schematic diagram showing the welding sequence of the grid limit seat and grid limit support of the support mechanism in the embodiments of this application.

[0028] Explanation of reference numerals in the attached figures

[0029] Supporting institutions 10

[0030] Grid limit support 110

[0031] Grid limit seat 120

[0032] First deformation control sub-block 130

[0033] Second deformation control sub-block 140 Detailed Implementation

[0034] The welding method for a narrow strip support mechanism proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, only for the purpose of conveniently and clearly illustrating the embodiments of this invention. Please refer to the drawings to make the objectives, features, and advantages of this invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives achieved by this invention, should still fall within the scope of the technical content disclosed in this invention.

[0035] like Figure 2As shown, the present invention provides a welding method for a narrow strip support mechanism 10. The narrow strip support mechanism 10 includes a U-shaped grid limiting support 110 and a flat, elongated grid limiting seat 120. The grid limiting seat 120 and the grid limiting support 110 have the same length to achieve matching welding along the length direction. In this embodiment, a grid limiting seat 120 with a length between 4 meters and 5 meters is used as an example. In other embodiments, the grid limiting seat 120 may also have a length less than 4 meters or greater than 5 meters, which is not limited here.

[0036] The welding method of this application employs multiple first deformation control sub-blocks 130 and multiple second deformation control sub-blocks 140 to assist in positioning the grid limiting support 110 and the grid limiting seat 120. Specifically, the welding method includes:

[0037] S10. The grid limiting support 110 and the grid limiting seat 120 are spot-welded together to form a set of support mechanisms 10. In this step, the grid limiting seat 120 and the grid limiting support 110, which belong to the same set of support mechanisms 10, are spot-welded together to fix them. Fixing the grid limiting seat 120 and the grid limiting support 110 by spot welding can achieve relative positioning of the two and avoid deformation of the grid limiting seat 120 and the grid limiting support 110 caused by large-area welding.

[0038] In this embodiment, 4-5 points are selected on each side of the grid limit seat 120 along its length for spot welding fixation, that is, a total of 8-10 points are selected on both sides of the grid limit seat 120 along its length for spot welding fixation. In other embodiments, other numbers of points can be selected on the length of the grid limit seat 120 for spot welding fixation, which is not limited here, as long as the positioning connection between the grid limit seat 120 and the grid limit support 110 can be achieved.

[0039] S20. Assemble and weld the grid limiting seats 120 of the two sets of support mechanisms 10 relative to each other. In this step, the grid limiting seats 120 of the two sets of support mechanisms 10 are welded and fixed relative to each other. The force of the interconnection between the grid limiting seats 120 of the two sets of support mechanisms 10 is used to counteract the force of deformation of the grid limiting seats 120 toward the grid limiting support 110 caused during the welding process between the grid limiting seats 120 and the grid limiting support 110, thereby reducing the deformation.

[0040] S30. A first deformation control sub-block 130 is welded to the inside of the grid limit support 110 to position the grid limit support 110. A second deformation control sub-block 140 is welded to connect the grid limit support 110 and the grid limit seat 120 to position the grid limit support 110 and the grid limit seat 120.

[0041] like Figure 4 As shown, the two ends of the first deformation control sub-block 130 are respectively connected to the two bifurcations of the "U"-shaped grid limiting support 110, and are used to position the relative position between the two bifurcations of the grid limiting support 110, thereby reducing the deformation of the grid limiting support 110 during subsequent welding of the grid limiting support 110 and the grid limiting seat 120. The two ends of the second deformation control sub-block 140 are respectively connected to the grid limiting support 110 and the grid limiting seat 120, and are used to position the relative position of the grid limiting support 110 and the grid limiting seat 120, thereby reducing the displacement deformation of the grid limiting support 110 relative to the grid limiting seat 120 during subsequent welding of the grid limiting support 110 and the grid limiting seat 120.

[0042] Furthermore, in the embodiments of this application, two second deformation control sub-blocks 140 are respectively provided on both sides of the grid limit support 110 to connect the two side branches of the grid limit support 110 and the grid limit seat 120, thereby further improving the stability of the connection between the grid limit support 110 and the grid limit seat 120 and reducing the deformation between the grid limit support 110 and the grid limit seat 120 during welding.

[0043] S40. The grid limiting support 110 and grid limiting seat 120 within the same set of support mechanisms 10 are segmented and welded. In this step, the grid limiting seat 120 is divided into multiple segments along its length, and segmented welding is used during the welding process. Compared to welding the entire section as a whole, segmented welding can reduce the deformation caused by welding. The short weld seams of segmented welding have a smaller residual stress range, allowing the support mechanism 10 a small amount of free contraction space during cooling, avoiding high stress concentration caused by rigid restraint, and reducing restraint stress.

[0044] In step S40, the grid limiting support 110 is divided into 8 to 12 welding segments for segmented welding. Segmented welding divides the continuous long weld into multiple short welds, reducing heat accumulation in a single welding operation and avoiding concentrated expansion and contraction caused by local overheating. In this embodiment, the grid limiting seat 120 is 4 to 5 meters long and is divided into 8 to 12 welding segments for welding. Segmented welding can shorten the single operation time, facilitate the control of the molten pool shape, reduce defects such as undercut and lack of fusion, ensure that the length of each welding segment is not too long, and improve the welding quality of each welding segment.

[0045] In a further preferred embodiment, the number of weld segments in the segmented welding is 10.

[0046] like Figure 6As shown, multiple welded segments are arranged sequentially along the length of the grid limiting seat 120. When welding each segment, welding is performed from the side away from the midpoint of the grid limiting seat 120 towards the side closer to the midpoint of the grid limiting seat 120. When welding alternately from both sides towards the middle, the shrinkage forces of the welds on both sides are in opposite directions, forming a mutual cancellation effect in the middle area, effectively suppressing the stress deformation of the overall support mechanism 10.

[0047] In a preferred embodiment, the welded sections located on both sides of the midpoint of the grid limit seat 120 are alternately welded. For example... Figure 6 As shown, alternating welding involves alternating welding segments on both sides of the midpoint along the length of the grating limit seat 120, with the next welding segment located on both sides of the midpoint along the length of the grating limit seat 120. This splitting into short weld segments results in a smaller residual stress range, and the alternating welding direction avoids unidirectional stress superposition, reducing the risk of root cracks in the weld.

[0048] In a more preferred embodiment, the welding segments located on both sides of the midpoint of the grid limiting seat 120 are staggered during welding. Staggered welding refers to alternating staggered welding of the welding segments on both sides of the midpoint along the length of the grid limiting seat 120. The specific welding sequence and direction of each welding segment in this embodiment are as follows: Figure 6 As shown, alternating misalignment can separate the welding start points and directions of adjacent segments, avoiding linear superposition of heat in space. In addition, misaligned welding disperses shrinkage force into multiple local effects, avoiding overall bending or twisting and optimizing the distribution of residual stress.

[0049] In this embodiment, the grid limiting support 110 and the grid limiting seat 120 are simultaneously welded on both sides of the grid limiting support 110 to control the deformation and residual stress after welding. Simultaneous welding on both sides can make the heating and cooling process of the weld area symmetrical and the shrinkage force direction opposite, which significantly reduces the bending, angular deformation or torsional deformation caused by unilateral welding. The heat input balance of simultaneous welding on both sides can avoid the concentration of residual stress caused by unilateral welding and reduce the risk of cracking.

[0050] In step S30, as Figure 5 As shown, the first deformation control sub-block 130 set in the grid limit support 110 and the two second deformation control sub-blocks 140 connecting the grid limit support 110 and the grid limit seat 120 form a set of deformation control components. Along the length direction of the grid limit seat 120, the number of deformation control components is the same as the number of welding segments, so that each set of deformation control components corresponds to each welding segment, ensuring that each set of deformation control components can suppress the deformation of the corresponding welding segment.

[0051] Continue as Figure 5As shown, the first deformation control sub-block 130 of the same set of deformation control components is closer to the midpoint of the grid limit seat 120 than the second deformation control sub-block 140. The first deformation control sub-block 130 and the second deformation control sub-block 140 in the same set of deformation control components are staggered along the length direction of the grid limit seat 120, which improves the reliability of the positioning of the first deformation control sub-block 130 and the second deformation control sub-block 140 on the grid limit seat 120 and the grid limit support 110.

[0052] After step S40, step S50 is also included, in which the grid limiting seats 120 of the two sets of support mechanisms 10 are removed and separated. After the grid limiting seats 120 and grid limiting supports 110 in the same set of support structures are welded together, the two sets of support mechanisms 10 are separated. After further removing each first deformation control sub-block 130 and second deformation control sub-block 140, each set of support structure can be used independently.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] In the description of this invention, it should be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0055] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A welding method for a narrow strip-shaped support mechanism, characterized in that, The narrow strip-shaped support mechanism includes a curved grid-shaped limiting support and a flat grid-shaped limiting seat. The welding method uses multiple first deformation control sub-blocks and multiple second deformation control sub-blocks to assist in positioning the grid-shaped limiting support and the grid-shaped limiting seat. The welding method includes: S10, spot welding the grid-shaped limiting support and the grid-shaped limiting seat to fix them together to form a set of support mechanisms; S20, assembling and welding the grid-shaped limiting seats of the two sets of support mechanisms relative to each other; S30, using the first deformation control sub-blocks to weld to the inner side of the grid-shaped limiting support to position the grid-shaped limiting support; and using the second deformation control sub-blocks to weld and connect the grid-shaped limiting support and the grid-shaped limiting seat. The grid limiting seat is used to position the grid limiting support and the grid limiting seat; the first deformation control sub-block and two second deformation control sub-blocks connecting the grid limiting support and the grid limiting seat are a set of deformation control components. Along the length direction of the grid limiting seat, the number of deformation control components is the same as the number of welding segments; S40, the grid limiting support and the grid limiting seat in the same set of support mechanisms are welded in segments; S50, after the grid limiting seat and the grid limiting support in the same set of support mechanisms are welded, the two sets of support mechanisms are separated, and each first deformation control sub-block and second deformation control sub-block is removed.

2. The welding method as described in claim 1, characterized in that, In step S40, the entire length of the grid limiting support is divided into 8 to 12 welding segments for segmented welding.

3. The welding method as described in claim 2, characterized in that, The number of welded segments in the segmented welding is 10.

4. The welding method as described in claim 2 or 3, characterized in that, The multiple welding segments are arranged sequentially along the length direction of the grid limiting seat. When welding each welding segment, welding is performed from the side of each welding segment away from the midpoint of the grid limiting seat to the side closer to the midpoint of the grid limiting seat.

5. The welding method as described in claim 4, characterized in that, The welding segments located on both sides of the midpoint of the grid limiting seat are alternately welded.

6. The welding method as described in claim 5, characterized in that, The welding segments are located on both sides of the midpoint of the grid limiting seat and are staggered.

7. The welding method as described in claim 6, characterized in that, The grid limiting support and the grid limiting seat are welded simultaneously on both sides of the grid limiting support.

8. The welding method as described in claim 1, characterized in that, The first deformation control sub-block of the same group of deformation control components is closer to the midpoint of the grid limit seat than the second deformation control sub-block.

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