A welding pretreatment structure for welding backing and its assembly structure.

Abstract

This invention provides a welding backing pretreatment structure, comprising a welding backing; the welding backing is a strip structure with a triangular cross-section; the welding backing is placed on a bevel with intervals, the two sides of the triangular structure are engaged with the two sides of the bevel, and the upper triangular side between the two sides of the triangular structure seals the intervals. By forming a structure that seals the intervals through the welding backing, it naturally detaches after final positioning welding, enabling welding from above, eliminating the inefficiency of previous overhead welding, and helping to solve the technical problem of the lack of an efficient welding method for welds with large gaps in the prior art.

Description

Technical fields:

[0001] This invention relates to the field of welding, and in particular to a welding backing welding pretreatment structure and its assembly structure. Background technology:

[0002] This invention addresses the issue of large gaps in ship joints by employing an improved ceramic gasket welding process. This allows for single-sided welding with double-sided forming, resulting in a fast, efficient, and stable welding method suitable for butt welds. Currently, welding large gaps requires one worker to apply the gasket from below, which is slow and labor-intensive. Specifically, workers need to apply the gasket while lying on their back, which is inefficient. The proposed method involves one worker applying the gasket from below while another performs the tack welding from above. After assembly and positioning, another worker needs to remove the gasket from the tack weld location from below. Any protruding weld seams on the back of the tack weld location require grinding.

[0003] There is an urgent need for a welding backing welding pretreatment structure, which would help solve the technical problem of the lack of an efficient welding method for welds with large gaps in the existing technology. Summary of the Invention:

[0004] In one embodiment, the present invention provides a welding backing welding pretreatment structure, which forms a sealing gap structure through the welding backing, and naturally falls off after final positioning welding, and realizes welding from above, saving the inefficiency of previous overhead welding, and helps to solve the technical problem of the lack of an efficient welding method for welds with large gaps in the prior art.

[0005] The welding pretreatment structure for the welding backing includes a welding backing;

[0006] The welding backing is a strip structure, and the cross-section of the welding backing is a triangular structure;

[0007] The welding gasket is used to be placed on a bevel with intervals, the two sides of the triangular structure are clamped on both sides of the bevel, and the upper triangular side between the two sides of the triangular structure blocks the interval.

[0008] In one embodiment, the groove formed by the triangular side and the bevel is filled with iron powder or scrap welding wire.

[0009] In one embodiment, the three sides of the triangular structure have lengths of 8 mm, 10 mm, and 12 mm, respectively, and the interval is 6 to 10 mm.

[0010] In one embodiment, the welding pad is 50 mm in length.

[0011] In one embodiment, the present invention provides a welding method based on a welding pretreatment structure for welding backing, wherein the gap ceramic backing welding method, based on the welding pretreatment structure for welding backing as described above, includes:

[0012] The welding gasket is inserted between the first and second side plates having the bevel;

[0013] After the positioning weld is performed from above the bevel downwards, the welding backing falls off;

[0014] A FAB pad is placed below the interval, and the iron powder or the scrap welding wire is laid on the bevel for submerged arc welding.

[0015] Remove the FAB gasket to complete the welding process.

[0016] In one embodiment, the tack weld height is 4 to 6 millimeters.

[0017] In one embodiment, the iron powder or the broken welding wire is laid at a height of 10 mm to 12 mm.

[0018] In one embodiment, the positioning welding is carbon dioxide positioning welding.

[0019] In one embodiment, the FAB pad is a strip structure with a semi-circular recessed groove on its upper surface. Attached image description:

[0020] Figure 1 This is a schematic diagram of a prior art welding structure in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of a welded structure using existing embedded welding technology in another embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the welding gasket in another embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the welding gasket structure along its length in another embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structural state during the tack welding of the welding backing in another embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structural state after tack welding in another embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the locating weld length structure in another embodiment of the present invention;

[0027] Figure 8This is a schematic diagram of the welding pretreatment structure for a welding backing during assembly in another embodiment of the present invention.

[0028] Figure label:

[0029] Triangle structure 1

[0030] Interval 2

[0031] Bevel 3

[0032] Groove 4

[0033] FAB padding 5

[0034] Top surface 51

[0035] 52 strip groove

[0036] First side panel 101

[0037] Second side panel 102 Detailed implementation method:

[0038] Figure 1 This is a schematic diagram of a prior art welding structure in one embodiment of the present invention; Figure 2 This is a schematic diagram of a welded structure using existing embedded welding technology in another embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the welding gasket in another embodiment of the present invention; Figure 4 This is a schematic diagram of the welding gasket structure along its length in another embodiment of the present invention; Figure 5 This is a schematic diagram of the structural state during the tack welding of the welding backing in another embodiment of the present invention; Figure 6 This is a schematic diagram of the structural state after tack welding in another embodiment of the present invention; Figure 7 This is a schematic diagram of the locating weld length structure in another embodiment of the present invention; Figure 8 This is a schematic diagram of the welding pretreatment structure for a welding backing during assembly in another embodiment of the present invention.

[0039] like Figures 1 to 8 As shown, in one embodiment, the present invention provides a welding backing pretreatment structure, the welding backing pretreatment structure including a welding backing;

[0040] The welding backing is a strip structure, and the cross-section of the welding backing is a triangular structure 1;

[0041] The welding backing is used to be placed on the bevel 3 with the interval 2. The two sides of the triangular structure are locked on both sides of the bevel 3, and the upper triangular side 11 between the two sides of the triangular structure 1 blocks the interval 2.

[0042] This embodiment provides a specific implementation of a welding backing welding pretreatment structure. The design concept of the structure is to form a groove for tack welding, allowing construction personnel to weld from top to bottom. This avoids overhead welding, thereby improving efficiency. Importantly, because the welding backing will naturally detach through the enlarged gap after the two sides of the bevel 3 melt, secondary processing is no longer required. This helps to solve the technical problem of the lack of an efficient welding method for welds with large gaps in the prior art.

[0043] It should be noted that, due to gravity, the triangular side 11 forms a horizontal lower surface, which allows for better positioning and welding. The length of the triangular side 11 will be slightly greater than the width of the interval 2.

[0044] In one embodiment, the groove 4 formed by the triangular side 11 and the bevel 3 is filled with iron powder or broken welding wire.

[0045] In this embodiment, after forming the groove 4 for positioning welding, the groove 4 can be formed by adjusting the positioning welding height, and then filled with iron powder or broken welding wire before the final assembly welding is performed.

[0046] In one embodiment, the three sides of the triangular structure have lengths of 8 mm, 10 mm, and 12 mm, respectively, and the interval between them is 6 to 10 mm.

[0047] This embodiment provides a preferred triangular structure and an applicable width distance range of 2 intervals.

[0048] In one embodiment, the welding pad is 50 mm in length.

[0049] This embodiment provides a specific implementation of the welding gasket length.

[0050] Structurally, the three sides of this gasket are 8mm, 10mm, and 12mm respectively, which can be used in gaps of 6-10mm, effectively improving assembly efficiency. The three sides of the gasket can also be set to 12, 14, and 16 for applications under other gap conditions.

[0051] The construction workers insert the corresponding triangular shim edge into the gap between the two plates, depending on the gap size. For example, if the gap is 6-7mm, an improved special triangular shim with an 8mm edge is placed at the tack weld location, eliminating the need for workers to attach it underneath. Then, CO2 gas shielded welding is used for tack welding. The tack weld thickness is 4-6mm, and the length is no less than 50mm. The tack weld will fuse approximately 1-2mm of plate thickness. After the tack weld is completed, the shim will detach automatically without requiring manual removal. Because the shim is placed within the bevel, the completed tack weld is flush with or concave with the plate thickness, eliminating the need for subsequent grinding of the back of the tack weld.

[0052] After assembly, submerged arc welding is used for the root pass. Before the root pass, a FAB backing is attached to the back, and iron powder or scrap welding wire is laid into the gap on the front, with a thickness of 10-12mm. Submerged arc welding can fully fuse the flush or concave parts of the tack welds, ensuring that the welding quality of the tack welds meets the requirements. This achieves the effect of single-sided welding and double-sided forming.

[0053] In one embodiment, the present invention provides a welding method based on a welding pretreatment structure for welding backing, wherein the gap ceramic backing welding method, based on the welding pretreatment structure for welding backing as described above, includes:

[0054] S101, the welding gasket is inserted between the first side plate 101 and the second side plate 102 having the bevel 3.

[0055] This step provides a specific procedure for inserting the welding gasket between a first side plate 101 and a second side plate 102 having a bevel 3.

[0056] S102, after positioning welding is performed from above the bevel 3 downwards, the welding backing falls off.

[0057] This step provides a specific procedure for the welding backing to detach after positioning welding is performed from above the bevel 3 downwards.

[0058] S103, place the FAB pad 5 below the interval 2, and lay the iron powder or the broken welding wire on the bevel 3 for submerged arc welding.

[0059] This step provides a specific procedure for placing a FAB pad 5 below the interval 2 and laying the iron powder or the broken welding wire on the bevel 3 for submerged arc welding.

[0060] S104, Remove FAB gasket 5 to complete welding.

[0061] This step provides a specific procedure for removing the FAB gasket 5 to complete the soldering.

[0062] This embodiment provides a specific implementation of a welding method based on a welding backing pretreatment structure.

[0063] In one embodiment, the tack weld height is 4 to 6 millimeters.

[0064] This embodiment provides a preferred range for the tack weld height.

[0065] In one embodiment, the iron powder or the broken welding wire is laid at a height of 10 mm to 12 mm.

[0066] This embodiment provides a specific range of preferred laying heights for the iron powder or the broken welding wire.

[0067] In one embodiment, the positioning welding is carbon dioxide positioning welding.

[0068] This embodiment provides a specific method for the positioning welding described above.

[0069] In one embodiment, the FAB pad 5 is a strip structure, and its upper end face 51 is provided with a strip groove 52 with a semi-circular concave cross-section.

[0070] This embodiment provides a specific structure for a FAB pad 5.

[0071] Beneficial effects:

[0072] 1. Transform the assembly and positioning methods that require large clearances into specific, simplified, regularized, and operable methods.

[0073] 2. Significantly reduced the construction time for applying and removing the gasket, and there is no need to grind the back of the locating weld afterwards.

[0074] 3. Improved assembly efficiency and reduced grinding workload.

[0075] It can quickly improve the construction efficiency of gap positioning welding, and realize the specificity, simplification and regularity of the assembly positioning that requires large gaps, shortening the construction time of applying linings and reducing grinding work.

Claims

1. A welding method based on a welding backing pretreatment structure, characterized in that, Based on the welding backing pretreatment structure, the welding backing pretreatment structure includes: The welding backing is a strip structure, and the cross-section of the welding backing is a triangular structure (1). The welding gasket is used to be placed on the bevel (3) with the interval (2), the two sides of the triangular structure are clamped on both sides of the bevel (3), and the upper triangular side (11) between the two sides of the triangular structure (1) blocks the interval (2). The groove (4) formed by the triangular side (11) and the bevel (3) is filled with iron powder or broken welding wire; The three sides of the triangle structure have lengths of 8 mm, 10 mm, and 12 mm, respectively, and the interval (2) is 6 to 10 mm. The welding backing is 50 mm in length. The welding method based on the welding backing pretreatment structure includes: The welding gasket is inserted between the first side plate (101) and the second side plate (102) having the bevel (3); After the positioning welding is performed from above the bevel (3) downwards, the welding backing falls off; Place a FAB pad (5) below the interval (2), and lay the iron powder or the broken welding wire on the bevel (3) for submerged arc welding; Remove the FAB gasket (5) to complete the welding.

2. The welding method based on the welding backing pretreatment structure according to claim 1, characterized in that, The tack weld height is 4 to 6 millimeters.

3. The welding method based on the welding backing pretreatment structure according to claim 2, characterized in that, The iron powder or the broken welding wire is laid at a height of 10 mm to 12 mm.

4. The welding method based on the welding backing pretreatment structure according to claim 3, characterized in that, The positioning welding is carbon dioxide positioning welding.

5. The welding method based on the welding backing pretreatment structure according to claim 4, characterized in that, The FAB pad (5) is a strip structure, and its upper end face (51) is provided with a strip groove (52) with a semi-circular concave cross section.

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