A T-shaped rib welding through-angle weld back weld face root clearance groove structure

Abstract

The application provides a back welding surface root clearance groove structure of a T-shaped rib welding penetration fillet weld, the width L of the groove is adjusted according to the thickness range of the rib web, wherein the rib panel and the rib web enclose the T-shaped rib, at this time, the depth h of the root clearance groove is related to the root clearance size p of the rib assembly groove, appropriate width L can be adopted for the rib web with different thickness, the root clearance size of the first welding surface groove of the rib web is P, the depth h of the groove is P+6, the root pass weld defects of the first welding surface are completely eliminated when the root is cleared, and good groove conditions are created for the automatic gas shielded welding of the back welding surface.

Description

Technical Field

[0001] This application belongs to the technical field of bevel structure of T-ribs, and particularly relates to a post-weld root cleaning bevel structure for a T-rib fillet weld. Background Technology

[0002] With the development of technology, T-shaped ribs need to be welded. The welding material is welded between the web and face plates of the T-shaped rib based on the bevel to form a T-shaped rib full penetration weld. After welding, it needs to pass ultrasonic flaw detection at level II. The welding requirements are high. Using automatic welding is beneficial to ensure welding quality, improve welding efficiency, and reduce the welder's strength. However, automatic root cleaning welding requires good root cleaning quality on the back side (rear weld surface) and welding bevel. The existing bevel is designed based on past experience, and the parameter requirements are not specific enough. Furthermore, the parameters such as the width and depth of the bevel are not specifically limited, which leads to the existing bevel design affecting automatic welding. Summary of the Invention

[0003] This application provides a post-weld root cleaning bevel structure for a T-rib full penetration fillet weld to solve the problem that existing bevel designs affect automatic welding.

[0004] In a first aspect, embodiments of this application provide a post-weld surface cleaning bevel structure for a T-shaped rib fillet weld, wherein the width L of the bevel is adjusted according to the thickness range of the rib web, wherein the rib face plate and the rib web are enclosed to form a T-shaped rib.

[0005] The root dimension of the bevel of the first welded surface of the rib web is P, and the depth of the bevel is h = P + 6.

[0006] Optionally, the thickness of the rib web is 16-24 mm, and the shape of the bevel of the first weld surface of the rib web is a single-sided bevel with P being 4-7 mm.

[0007] The thickness of the rib web is 25-28 mm, and the bevel of the rib web is a double-sided bevel with P being 7-9 mm.

[0008] Optionally, when the bevel width H of the first weld surface is less than 21mm, the root bevel width L is equal to 21mm, with an allowable error of ±1mm; when H is greater than 21mm, L is equal to H, with an allowable error of ±1mm.

[0009] Optionally, the beveling depth h should not exceed 2 / 3 of the rib web thickness.

[0010] Optionally, in the bevel design, the bevel should extend 1.5-2.5 mm into the rib panel.

[0011] Optionally, the radius R of the bottom arc of the bevel should be 3.5 ± 0.5 mm.

[0012] Optionally, the beveled surface of the rib panel extends 0-6 mm beyond the surface of the rib web.

[0013] Optionally, the rib web plate has a thickness of 16-28 mm.

[0014] This application provides a post-weld surface cleaning bevel structure for a T-shaped rib full penetration fillet weld. The width L of the bevel is adjusted according to the thickness range of the rib web. The rib face plate and rib web are joined to form a T-shaped rib. In this case, the depth h of the cleaning bevel is related to the root size p of the rib assembly bevel. This allows for the use of a suitable width L for rib webs of different thicknesses. The root size p of the bevel on the first welded surface of the rib web is used, and the depth h of the bevel is P + 6. This ensures that the root weld defects of the first welded surface are completely eliminated during cleaning and creates good bevel conditions for automatic gas shielded welding of the subsequent welded surface. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0017] Figure 1 This is a schematic diagram of the pre-welding assembly bevel structure for a T-rib full penetration fillet weld provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the pre-welding assembly bevel structure for a T-rib full penetration fillet weld provided in another embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the post-weld surface beveling structure for a T-rib full penetration fillet weld provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] This application provides a post-weld root cleaning bevel structure for a T-rib full penetration fillet weld to solve the problem that existing bevel designs affect automatic welding.

[0022] refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the pre-welding assembly bevel structure for a T-rib full penetration fillet weld provided in an embodiment of this application. Figure 2 This is a schematic diagram of the pre-welding assembly bevel structure for a T-rib full penetration fillet weld provided in another embodiment of this application. Figure 3 This is a schematic diagram of the post-weld surface beveling structure for a T-rib full penetration fillet weld provided in an embodiment of this application.

[0023] refer to Figure 1 , Figure 2 This application provides a post-weld surface cleaning bevel structure for a T-shaped rib full penetration fillet weld. The post-weld surface cleaning bevel structure for a T-shaped rib full penetration fillet weld includes a rib web 10 and a rib face plate 20, which together form a T-shaped rib. A bevel 30 is provided between the rib web 10 and the rib face plate 20.

[0024] When the thickness of the rib web 10 is 16-24mm, the bevel 30 is a single-sided bevel with P of 4-7mm. In this case, the bevel 30 is located on one side of the rib web 10, and the angle of the bevel 30 is 50°, which is not limited here.

[0025] When the thickness of the rib web 10 is 25-28mm, the bevel 30 has a double-sided bevel shape, and P is 7-9mm. At this time, the bevel 30 is set on both sides of the rib web 10, and the angle of the bevel 30 on the first welded side is 50°, which is not limited here. P is the blunt edge thickness or the depth of the bevel 30 on the subsequent welded side plus the blunt edge thickness.

[0026] At this time, the shape of the bevel 30 is adjusted according to different thicknesses, and the distance P is also adjusted accordingly so that the welding material can enter the bevel 30 and the welding material is welded to the rib web 10 and rib face plate 20 based on the bevel 30.

[0027] refer to Figure 3 ,exist Figure 1 or Figure 2After the automatic gas shielded welding of the rib's first weld surface is completed, the subsequent weld surface is mechanically cleaned. When using automatic welding, if the groove width is too small, interference between the welding torch nozzle and the base material will cause excessive wire extension during root weld welding, affecting the stability of the welding arc. If the groove width is too large, it will lead to increased filler volume and an excessively large capping layer. To solve this problem, the groove width L is adjusted according to the thickness range of the rib web 10. When the groove width H of the first weld surface is less than 21mm, L equals 21mm, with an allowable error of ±1mm; when H is greater than 21mm, L equals H, with an allowable error of ±1mm.

[0028] refer to Figure 3 Furthermore, the groove depth (30°) is an important welding parameter and a key factor in ensuring the complete elimination of defects in the root weld. To ensure thorough root cleaning, the groove depth (h) in the groove design should be P + 6. Optionally, h should not exceed 2 / 3 of the thickness of the rib web 10.

[0029] refer to Figure 3 The bottom detail of the bevel 30 is one of the key factors to ensure thorough root cleaning and subsequent qualified automatic welding. When designing the bevel 30, it should penetrate 1.5-2.5mm into the rib panel 20. If this value is too small, the root weld will be close to the side of the rib panel, resulting in insufficient root cleaning depth and difficulty in completely removing defects. If this value is too large, on the one hand, it will affect the arc direction during automatic welding, which is not conducive to weld distribution; on the other hand, the bevel 30 will have an excessively large inclination angle on the side wall of the rib panel, which is not conducive to the discharge of gas and slag in the molten pool, resulting in welding defects such as porosity and slag inclusions.

[0030] Meanwhile, the radius R of the bottom arc of the bevel 30 should be 3.5±0.5mm. If the radius is too large, the size of the bevel 30 will be too large, increasing the amount of welding filler and making it difficult to distribute the weld bead; if the radius is too small, it will be difficult to ensure thorough root cleaning and is not conducive to welding.

[0031] When the bevel 30 is machined, the machined surface of the bevel 30 of the rib panel 20 extends 0-6mm beyond the surface of the rib web 10. If this value is too large, it will lead to an increase in the size of the cover layer weld, increase the amount of welding work, and cause the weld leg size to exceed the standard.

[0032] Optionally, the thickness of the rib web 10 is 16-28 mm.

[0033] This patent has been applied in an automated gas-shielded welding trolley for welding the fillet weld of a T-shaped annular rib web-rib face plate with a diameter of approximately 7m. The main process is as follows:

[0034] (1) Select a 1 / 4 rib with a web plate thickness of 22mm, and cut it at a 30° bevel on the front. Figure 1 For machining, P is 6-7mm.

[0035] (2) Automatic gas shielded welding is used to weld the 30-face bevel weld.

[0036] (3) After the 30mm bevel weld is completed, turn the machine over and use mechanical cleaning to clean the root. Figure 3 The bevel is machined to a 30mm bevel, and the dimensional accuracy of the bevel is within the range shown in the drawing. L is 21-23mm, and h is 12-14mm.

[0037] (4) After the bevel 30 is processed, the root cleaning surface is welded in the same way as the bevel 30 surface.

[0038] (5) After welding, non-destructive testing and mechanical property tests were conducted in accordance with relevant standards, and all results were qualified.

[0039] This application provides a post-weld face cleaning bevel structure for a T-shaped rib full-thickness fillet weld. The post-weld face cleaning bevel structure includes a rib web 10 and a rib face plate 20, which together form a T-shaped rib. When performing double-sided automatic gas-shielded welding on the T-shaped rib composed of the rib web 10 and rib face plate 20, after welding the first weld face, selecting an appropriate bevel size 30 can optimize the welding effect. The width L of the bevel 30 is related to the thickness of the rib web 10 and the width H of the bevel on the first weld face, establishing the influence between the width L and the thickness range of the rib web 10. The depth h of the bevel 30 is related to the root dimension P of the web 10, with the depth h = P + 6, establishing the relationship between the depth h of the bevel 30 and the distance P. Specific detailed dimensions are given for the root dimensions of the bevel on the clean face. Ensure that defects in the root weld of the first welded surface are completely eliminated during root cleaning, and create good bevel conditions for automatic gas shielded welding of the subsequent welded surface.

[0040] In addition, the fillet weld between the web plate 10 of the T-rib and the face plate 20 is welded using double-sided automatic gas-shielded welding. A suitable root bevel size is selected for the subsequent weld surface; choosing an appropriate bevel size can optimize the welding effect.

[0041] Among them, the width L of the 30mm bevel is related to the web thickness and the bevel width H of the first weld face, thus establishing the influence between the width L and the range of the web thickness and the bevel width H of the first weld face; the depth h of the root cleaning bevel is related to the root size p of the web bevel, and the bevel depth h = P + 6; refined dimensions are given for the root size of the root cleaning bevel. This ensures that weld defects at the root of the first weld face are completely eliminated during root cleaning and creates good bevel conditions for automatic gas shielded welding of the subsequent weld face.

[0042] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0043] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A post-weld face root cleaning beveling structure for a T-shaped rib full penetration fillet weld, characterized in that, The width L of the bevel is adjusted according to the thickness range of the rib web, wherein the rib face plate and the rib web form a T-shaped rib. The root dimension of the bevel of the first welded surface of the rib web is P, the depth of the bevel is h=P+6, and the depth of the bevel h does not exceed 2 / 3 of the thickness of the rib web.

2. The post-weld surface cleaning beveling structure for a T-rib full penetration fillet weld according to claim 1, characterized in that, The thickness of the rib web is 16-24mm, and the shape of the bevel of the first weld surface of the rib web is a single-sided bevel with P being 4-7mm. The thickness of the rib web is 25-28 mm, and the bevel of the rib web is a double-sided bevel with P being 7-9 mm.

3. The post-weld surface cleaning beveling structure for a T-rib full penetration fillet weld according to claim 2, characterized in that, When the bevel width H of the first weld surface is less than 21mm, the root bevel width L is equal to 21mm, with an allowable error of ±1mm; when H is greater than 21mm, L is equal to H, with an allowable error of ±1mm.

4. The post-weld face root cleaning beveling structure for a T-rib full penetration fillet weld according to any one of claims 1 to 3, characterized in that, When designing the bevel, the bevel should extend 1.5-2.5 mm into the rib panel.

5. The post-weld surface cleaning beveling structure for a T-rib full penetration fillet weld according to claim 4, characterized in that, The radius R of the bottom arc of the bevel should be 3.5 ± 0.5 mm.

6. The post-weld surface cleaning beveling structure for a T-rib full penetration fillet weld according to claim 4, characterized in that, The beveled surface of the rib panel extends 0-6 mm beyond the surface of the rib web.

7. The post-weld face root cleaning beveling structure for a T-rib full penetration fillet weld according to claim 4, characterized in that, The thickness of the rib web is 16-28 mm.

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