A TKY node weld foot size inspection method

Abstract

The present invention relates to a method for inspecting the fillet weld size of a TKY joint. The method for inspecting the fillet weld size of a TKY joint according to the present invention includes the following steps: calculating the theoretical minimum size D from the weld toe to the intersection line of the outer wall of the branch pipe; assembling the branch pipe with the main pipe after cutting the intersection line and the groove. Before welding, use a line-drawing tooling to draw an inspection line on the surface of the main pipe, and the distance between the inspection line and the intersection line of the outer wall of the branch pipe is X, where X ≥ D; after the welding of the branch pipe and the main pipe is completed, when inspecting, measure the distance H from the weld toe to the inspection line; if X - H ≥ D, the fillet weld size is qualified, and if X - H < D, the fillet weld is insufficient. The method for inspecting the fillet weld size of a TKY joint provided by the present invention is simple and fast, greatly improving the efficiency and accuracy of inspecting the fillet weld size of a TKY joint, and effectively ensuring the project quality.

Description

Technical Field

[0001] The present invention relates to a method for measuring weld dimensions, and particularly to a method for inspecting the fillet weld size of a TKY joint. Background Art

[0002] Due to its advantages such as high strength, good toughness, large stiffness, less occupied space, and beautiful appearance, steel structures have been widely used in the fields of construction industry, mining machinery, military engineering, ocean engineering, and offshore wind power. In some steel structure buildings, tubular joints are often used, especially the TKY - type tubular joints. The steel structure TKY joint is a kind of pipe - intersecting joint, which can be divided into three forms: T, K, and Y according to the spatial form of the pipes. This kind of joint structure is widely used in the field of ocean engineering, especially in steel structures such as jacket platforms.

[0003] The fillet weld size and weld strength of the pipe - pipe intersection weld of the TKY joint have a great influence on the stability and safety of the steel structure. However, there is no testing and inspection method related to the fillet weld size of the pipe - pipe intersection in the prior art. When conducting project acceptance or third - party inspection, it is usually judged whether the fillet weld size is qualified by visual inspection, which is highly subjective and there is great instability in welding quality control. Summary of the Invention

[0004] Based on this, the present invention provides a method for inspecting the fillet weld size of a TKY joint, which can effectively inspect whether the fillet weld size of the intersection line is qualified and effectively ensure the project quality.

[0005] A method for inspecting the fillet weld size of a TKY joint includes the following steps: calculating the theoretical minimum size D from the weld toe to the intersection line of the outer wall of the branch pipe; assembling the branch pipe with the main pipe after cutting the intersection line and the groove. Before welding, use a marking tooling to draw an inspection line on the surface of the main pipe, and the distance between the inspection line and the intersection line of the outer wall of the branch pipe is X, where X ≥ D; after the welding of the branch pipe and the main pipe is completed, when conducting inspection, measure the distance H from the weld toe to the inspection line; if X - H ≥ D, the fillet weld size is qualified, and if X - H < D, the fillet weld is insufficient.

[0006] By drawing the inspection line on the surface of the main pipe before welding, when conducting project acceptance, only need to measure the distance between the actual weld toe and the inspection line to accurately judge whether the fillet weld size is qualified. The method for inspecting the fillet weld size of the TKY joint provided by the present invention is simple and fast, greatly improving the efficiency and accuracy of inspecting the fillet weld size of the TKY joint and ensuring the project quality.

[0007] Furthermore, calculating the theoretical minimum dimension D from the weld toe to the intersection line of the branch pipe outer wall includes the following steps: using 3D modeling software to establish a 3D model of the branch and main pipe TKY node; dividing the branch pipe outer wall intersection line into several equal parts; intercepting the cross-section at each equal part in the 3D model to obtain the main pipe-branch pipe intersection angle α at each location; obtaining the branch pipe groove angle β and the weld leg width E based on the intersection angle α; and calculating the theoretical minimum dimension D from the weld toe to the branch pipe outer wall intersection line based on the intersection angle α, the branch pipe groove angle β, the weld leg width E, and the distance W from the branch pipe outer wall intersection line to the groove root, where D=EW.

[0008] Furthermore, the weld leg width E includes the groove depth T and the weld smooth transition width F, and the weld smooth transition width F is 5 to 10 mm, and E=T+F.

[0009] The main-branch intersection angle α at each location is obtained through 3D modeling. Based on the intersection angle α, the groove angle β, and the groove depth T, the distance W from the intersection line on the outside of the branch pipe to the groove root at different intersection angles α can be calculated by drawing. The theoretical minimum dimension D = EW = (T + F) - W from the weld toe to the intersection line on the outer wall of the branch pipe is calculated.

[0010] Furthermore, the method further includes the following steps: before welding, the branch pipe is cut at the intersection line and the positions of the equal points are marked. The positions of the equal points are marked to facilitate subsequent project acceptance or third-party inspection.

[0011] Furthermore, the line drawing tool includes a handheld arm, a back plate, an arc plate, a flexible ruler and a fixed block; the back plate is in the shape of an elongated strip, and the arc plate and the handheld arm are respectively fixed on both sides of the back plate; the handheld arm is fixed to one end of the back plate; the inner wall radius of the arc plate is the same as the outer wall radius of the branch pipe, and the outer wall of the arc plate is tangent to the surface of the back plate; the fixed block is fixed to the back plate on the same side as the arc plate, and the end face of the bottom end of the fixed block is coplanar with the end face of the back plate away from the handheld part; one end of the flexible ruler is fixed to the side of the fixed block away from the back plate, and the thickness of the flexible ruler and the fixed block in the direction perpendicular to the surface of the back plate is equal to the thickness of the arc plate; the measurement starting point of the flexible ruler is located at the bottom end of the fixed block away from the back plate.

[0012] The arc plate is a curved plate with a certain radius and arc length and uniform thickness, which includes an arc-shaped inner wall (small radius) and an arc-shaped outer wall (large radius), and the radius of the inner wall is the same as the radius of the outer wall of the branch pipe. By setting the arc plate, the line drawing tool can stably fit the outer wall surface of the branch pipe when moving or drawing, thereby ensuring the accuracy of the inspection line. One end of the flexible ruler is fixed to the side of the fixed block away from the back plate, and the thickness of the flexible ruler and the fixed block in the direction perpendicular to the back plate surface is equal to the thickness of the arc plate, and the measurement starting point of the flexible ruler is located at the bottom end of the side of the fixed block away from the back plate, which can accurately locate the intersection line of the outer wall of the branch pipe and the main pipe, thereby accurately obtaining the inspection line with a distance X from the intersection line of the outer wall of the branch pipe.

[0013] Furthermore, the flexible ruler is provided with a ruler scale, which can facilitate line drawing operations.

[0014] Furthermore, the method of using the line drawing tool includes the following steps: the arc portion and the fixed block are tightly fitted to the outer wall of the branch pipe, and the zero scale line of the ruler is against the outer wall of the main pipe; the flexible ruler is tightly attached to the surface of the main pipe and kept taut, and the handheld arm is operated to rotate the line drawing tool around the branch pipe, and the inspection line is drawn on the surface of the main pipe at the corresponding scale; if the angle of some points is too small to use the tool, a flexible ruler can be used to directly measure the drawing points.

[0015] Furthermore, the present invention provides a method for inspecting weld leg dimensions in TKY nodes without inspection lines, comprising the following steps: calculating the theoretical minimum dimension D from the weld toe to the intersection line of the branch pipe outer wall; laying out an expanded diagram of the branch pipe outer wall intersection line; drawing a theoretical weld toe line on the expanded diagram based on the theoretical minimum dimension D from the weld toe to the intersection line of the branch pipe outer wall; preparing a weld toe curve template based on the theoretical weld toe line; attaching the weld toe curve template to the welded leg; checking the distance from the weld toe to the weld toe curve template; if the actual weld toe is below the template, the weld leg dimension exceeds the minimum weld toe requirement as specified in the specification, and the weld is qualified; if there is a gap between the actual weld toe and the weld toe curve template, the weld leg dimension does not meet the minimum weld toe requirement as specified in the specification, and re-welding is required. This method can be used to inspect weld leg dimensions without drawing inspection lines before welding.

[0016] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the TKY node structure provided in Example 1.

[0018] Figure 2 This is a schematic diagram of the structure of the TKY node provided in Example 1 after welding is completed.

[0019] Figure 3This is the segmentation diagram of the intersection line of the outer wall of the TKY node branch pipe provided in Example 1.

[0020] Figure 4 Schematic diagram of the cross-sectional structure at different angles of the TKY node model provided in Example 1.

[0021] Figure 5 Schematic diagram of the weld foot structure of each cross section provided in Example 1.

[0022] Figure 6 Schematic diagram of the weld foot structure of sections 3, 4, 5, 7, and 8 provided in Example 1.

[0023] Figure 7 This is a cross-sectional view of the line drawing tool provided in Example 1.

[0024] Figure 8 This is a schematic diagram of the cross-sectional structure of the line drawing tool provided in Example 1 along the ZZ direction.

[0025] Figure 9 This is the layout diagram of the intersection lines of the branch pipe outer walls provided in Example 2.

[0026] Figure 10 This is the expanded view of the intersection lines of the branch pipe outer wall provided in Example 2.

[0027] Figure 11 Schematic diagram of weld foot size inspection provided in Example 2. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] See also Figure 1-6 This embodiment provides a TKY node weld foot size inspection method, this embodiment is through Branch pipe and The method for inspecting the weld feet of a TKY node composed of a main body is specifically described. The method for inspecting the weld feet size of a TKY node of the present invention is specifically described.

[0031] See also Figure 1 The TKY pipe node includes a branch pipe 100 and a main pipe 200 . The branch pipe 100 intersects the surface of the main pipe 200 , and a branch pipe outer wall intersection line 210 is formed between the branch pipe 100 and the main pipe 200 .

[0032] See also Figure 2, the present invention provides a method for inspecting the fillet weld size of a TKY joint, including the following steps:

[0033] Calculate the theoretical minimum size D of the weld toe 220 to the intersection line 210 of the outer wall of the branch pipe at different intersection angles.

[0034] Assemble the branch pipe 100 with the cut intersection line and groove with the main pipe 200. Before welding, use a line-drawing tooling to draw an inspection line 240 on the surface of the main pipe. The distance between the inspection line 240 and the intersection line 210 of the outer wall of the branch pipe is X, and X≥D.

[0035] After welding the branch pipe and the main pipe, during inspection, measure the distance H from the actual weld toe 230 at each point to the inspection line 240.

[0036] If X - H≥D, the fillet weld size is qualified; if X - H < D, the fillet weld is insufficient and need to be repaired by additional welding. The weld toe 220 is the theoretical weld toe.

[0037] The specific steps for calculating the theoretical minimum size D of the weld toe 220 to the intersection line 210 of the outer wall of the branch pipe include the following:

[0038] Use 3D modeling software to establish a 3D model of the TKY joint of the branch pipe and the main pipe.

[0039] Refer to Figure 3 , divide the intersection line 210 of the outer wall of the branch pipe into 16 equal parts, and divide it into two halves along the longitudinal symmetry line of the intersection line 210 of the outer wall of the branch pipe. The unilateral equal division points are respectively denoted as points 0 to 8.

[0040] Refer to Figure 4 , respectively intercept the cross-sections at points 0 to 8 in the 3D model to obtain the main pipe-branch pipe intersection angles α0 to α8.

[0041] Refer to Figure 5-6 , according to the technical requirements, obtain the branch pipe groove angles β0 - β8 and groove depths T0 - T8 based on the intersection angles α0 to α8 of each equal division point. Adding the weld smooth transition width F to the groove depths T0 - T8 can obtain the fillet weld widths E0 - E8. In this embodiment, the weld smooth transition width F is 10mm. In other embodiments, the size of the weld smooth transition width F can be determined according to the actual situation, usually 5 - 10mm.

[0042] Based on the intersection angles α0-α8, the branch pipe groove angles β0-β8, and the groove depths T0-T8, a proportional plot can be created using 2D drawing software (such as CAD) to determine the distances W0-W8 from the branch pipe outer diameter to the groove root. The theoretical minimum dimensions D0-D8 from the weld toe to the branch pipe outer wall intersection line can then be calculated: D = E – W = (T + F) - W. In this embodiment, the theoretical minimum dimension D from the weld toe to the branch pipe outer wall intersection line is determined through planar plotting. In other embodiments, this can be determined through mathematical calculations based on parameters such as the intersection angle α, groove angle β, groove depth T, and weld smooth transition width F.

[0043] See also Figure 5 According to technical requirements, when α ≥ 135°, the weld only needs to fill the groove, that is, D = F. For α < 135°, the D value requires drawing and measurement. In this embodiment, α3, α4, α5, α7, and α8 are less than 135°. See 6, and the values ​​of D3, D4, D5, D7, and D8 are obtained by proportional drawing using CAD.

[0044] The specific values ​​of the intersection angles α0-α8, groove angles β0-β8, groove depths T0-T8, weld leg widths E0-E8, and the theoretical minimum dimension D of the intersection line from the weld toe to the outer wall of the branch pipe in this embodiment are shown in Table 1:

[0045] Table 1 Values ​​of α0~α8, β0-β8, T0~T8, E0~E8 and D0~D8

[0046]

[0047]

[0048] In addition, when cutting the intersection line and beveling the branch pipe, mark the position of each equal division point so that the measurement position can be determined during inspection.

[0049] In a specific embodiment, referring to Figure 7-8 The line drawing tool 300 includes a handheld arm 311, a back plate 312, an arc plate 313, a flexible ruler 314 and a fixed block 315.

[0050] The back plate 312 is in an elongated strip shape and is made of a rigid material.

[0051] The handheld arm 311 and the arc plate 313 are respectively located on two sides of the back plate 312 .

[0052] The handheld arm 311 is perpendicular to the surface on which the back plate 312 is fixed, and is located at one end of the back plate 312 .

[0053] The arc plate 313 is a curved plate with a certain radius and arc length, and a uniform thickness. It includes an inner arc wall (small radius) and an outer arc wall (large radius). The inner wall radius is the same as the outer wall radius of the branch pipe. The outer wall of the arc plate 313 is tangent to the surface of the back plate 312 and is fixed with countersunk screws.

[0054] The fixed block 315 is fixed to the back plate on the same side as the arc plate 313, and the end face of the bottom end of the fixed block 315 is coplanar with the end face of the back plate 312 away from the handheld part; one end of the flexible scale 314 is fixed to the side of the fixed block 315 away from the back plate 312, and the thickness of the flexible scale 314 and the fixed block 315 in the direction perpendicular to the surface of the back plate 312 is equal to the thickness of the arc plate 313; the measurement starting point of the flexible scale 314 is located at the bottom end of the fixed block 315 away from the back plate 312.

[0055] Furthermore, the flexible ruler 314 is provided with scale marks so as to draw a test line on the main pipe. The flexible ruler can be a tape measure or the like.

[0056] The method for using the line drawing tool 300 includes the following steps:

[0057] The arc portion 313 is tightly fitted to the outer wall of the branch pipe, and the zero scale line of the flexible ruler 314 is against the outer wall of the main pipe 200;

[0058] The flexible ruler 314 is held tightly against the surface of the main pipe 200 and kept taut. The handheld arm 311 is operated to rotate the marking tool 300 around the branch pipe 100 to draw a test line 230 on the surface of the main pipe 200 at the corresponding scale.

[0059] If the angles of some points are too small to use tooling, use a flexible ruler to directly measure the drawing points.

[0060] Example 2

[0061] See also Figure 9-11 This embodiment provides a TKY node weld foot size inspection method without an inspection line, comprising the following steps:

[0062] Calculate the theoretical minimum dimension D of the intersection line from the weld toe to the outer wall of the branch pipe. For the specific calculation method, please refer to Example 1 and will not be repeated here.

[0063] See also Figure 9 , and lay out the expanded view of the intersection line 210 of the branch pipe outer wall.

[0064] See also Figure 10 According to the theoretical minimum dimension D from the weld toe to the intersection line of the branch pipe outer wall, a theoretical weld toe line 220 is drawn in the unfolded view of the intersection line 210 of the branch pipe outer wall.

[0065] A weld toe curve template 400 is prepared based on the theoretical weld toe line 220 .

[0066] See also Figure 11 , set the weld toe curve template 400 on the weld leg of the completed weld.

[0067] Check the distance from the weld toe to the weld toe curve template 100. If the actual weld toe is below the template, the weld leg size exceeds the minimum weld toe requirement of the specification and the weld is qualified. If there is a gap between the actual weld toe and the weld toe curve template, the weld leg size does not meet the minimum size required by the specification and additional welding is required.

[0068] This method can be used to inspect weld leg dimensions without drawing inspection lines before welding.

[0069] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A TKY node weld foot size inspection method, characterized in that: It includes the following steps: Calculate the theoretical minimum dimension D from the weld toe to the intersection curve of the branch pipe outer wall; Assemble the branch pipe with the cut intersection curve and bevel with the main pipe. Before welding, use a line-drawing tooling to draw an inspection line on the surface of the main pipe. The distance between the inspection line and the intersection curve of the branch pipe outer wall is X, and X ≥ D; After the branch pipe and the main pipe are welded, when inspecting, measure the distance H from the weld toe to the inspection line; If X - H ≥ D, the fillet weld size is qualified. If X - H < D, the fillet weld is insufficient; Among them, the calculation of the theoretical minimum dimension D from the weld toe to the intersection curve of the branch pipe outer wall includes the following steps: Use 3D modeling software to establish a 3D model of the TKY joint of the branch pipe and the main pipe; Divide the intersection curve of the branch pipe outer wall into several equal parts; Respectively intercept the cross-sections at each equal part in the 3D model to obtain the intersection angle α of the main pipe - branch pipe at each place; Obtain the bevel angle β and fillet weld width E of the branch pipe according to the intersection angle α; According to the intersection angle α, the bevel angle β of the branch pipe, the fillet weld width E, and the distance W from the intersection curve of the branch pipe outer wall to the root of the bevel, calculate the theoretical minimum dimension D from the weld toe to the intersection curve of the branch pipe outer wall, D = E - W; The fillet weld width E includes the bevel depth T and the smooth transition width F of the weld seam. The smooth transition width F of the weld seam is 5 - 10 mm.

2. The TKY node weld foot size inspection method according to claim 1, characterized in that: It also includes the following steps: Before welding, perform intersection curve cutting on the branch pipe and mark the positions of each equal part point.

3. The TKY node weld foot size inspection method according to claim 1, characterized in that: The line-drawing tooling includes a handheld arm, a back plate, an arc plate, a flexible ruler, and a fixing block; The back plate is strip-shaped. The arc plate and the handheld arm are respectively fixed on both sides of the back plate; The handheld arm is fixed at one end of the back plate; The inner wall radius of the arc plate is the same as the outer wall radius of the branch pipe, and the outer wall of the arc plate is tangent to the surface of the back plate; The fixing block is fixed on the back plate on the same side as the arc plate. The end face at the bottom of the fixing block is coplanar with the end face of the back plate far from the handheld part; One end of the flexible ruler is fixed on the side of the fixing block away from the back plate. The thickness of the flexible ruler and the fixing block in the direction perpendicular to the surface of the back plate is equal to the thickness of the arc plate. The measurement starting point of the flexible ruler is at the bottom end of the fixing block away from the back plate; 4. The TKY node weld foot size inspection method according to claim 3, characterized in that: The flexible ruler is provided with scale graduations.

5. The TKY node weld foot size inspection method according to claim 4, characterized in that: The usage method of the line-drawing tooling includes the following steps: Closely fit the arc part with the outer wall of the branch pipe, and the measurement starting point of the flexible ruler abuts against the outer wall of the main pipe; The flexible ruler closely adheres to the surface of the main pipe and remains taut. Operate the handheld arm to make the line-drawing tooling rotate around the branch pipe, and draw an inspection line on the surface of the main pipe at the corresponding scale; If the included angle of some points is too small to use the tooling, the flexible ruler can be directly used to measure and draw points.

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