Placing type welding structure of stainless steel connecting pipe and carbon steel shell

Abstract

The utility model belongs to the technical field of welding of high-voltage equipment, and particularly relates to a placing type welding structure of a stainless steel connecting pipe and a carbon steel shell. According to the technical scheme, the placing type welding structure of the stainless steel connecting pipe and the carbon steel shell comprises the stainless steel connecting pipe and the carbon steel shell, a stainless steel layer is overlaid on the outer surface of the carbon steel shell, a flange is arranged on the inner side of the end of the stainless steel connecting pipe, and the end of the stainless steel connecting pipe is welded to the stainless steel layer on the carbon steel shell. The utility model provides a placing type welding structure of a stainless steel connecting pipe and a carbon steel shell.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-pressure equipment welding, and particularly relates to a socket welding structure of a stainless steel nozzle and a carbon steel shell. Background Art

[0002] In petrochemical plants, high-pressure equipment is widely used. For high-pressure equipment, when the nozzle is made of pure stainless steel and the shell is made of carbon steel surfacing stainless steel, the usual practice is to weld according to the socket welding structure in Appendix D.3.3 of GB / T150.3 or G39 and G40 in HG / T20583. According to the actual welding situation, it is difficult to solve the dissimilar steel welding problem between the nozzle and the shell. The weld strength between the nozzle and the shell is low, defects are likely to occur, and the welding operation is also difficult. Content of the Utility Model

[0003] In order to solve the above problems existing in the prior art, the purpose of the utility model is to provide a socket welding structure of a stainless steel nozzle and a carbon steel shell.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A socket welding structure of a stainless steel nozzle and a carbon steel shell includes a stainless steel nozzle and a carbon steel shell. A stainless steel layer is surfacing-welded on the outer surface of the carbon steel shell. A flange is arranged on the inner side of the end of the stainless steel nozzle, and the end of the stainless steel nozzle is welded to the stainless steel layer on the carbon steel shell.

[0006] The outer surface of the carbon steel shell of the utility model is surfacing-welded with a stainless steel layer to avoid dissimilar steel welding when welding the stainless steel nozzle and the carbon steel shell. The inner wall of the stainless steel nozzle has a flange, which is equivalent to welding with a backing plate. After welding, boring is carried out along the inner diameter of the opening after surfacing welding, and the flange on the inner wall of the nozzle and the root of the weld are removed, so as to ensure the reliability of the welding quality.

[0007] The welding structure of the utility model has carried out welding process qualification, and all indexes meet the design requirements. Moreover, this welding structure solves the defect problems that may be brought by dissimilar steel welding, is more material-saving than the traditional standard structure, and the manufacturing process is also simple, which has great significance for reducing energy consumption and optimizing the manufacturing process.

[0008] As a preferred scheme of the utility model, the thickness of the stainless steel layer surfacing-welded on the carbon steel shell is not less than 6mm.

[0009] As a preferred scheme of the utility model, the end face of the stainless steel nozzle is chamfered, and the welding area is the area surrounded by the chamfered surface of the stainless steel nozzle, the flange and the stainless steel layer.

[0010] As a preferred scheme of the utility model, the chamfer of the stainless steel nozzle is 30°±2°.

[0011] As a preferred embodiment of the present utility model, a radial gap is left between one end of the flange protruding from the stainless steel pipe and the inner wall of the stainless steel pipe.

[0012] As a preferred embodiment of the present utility model, the connection between the flange and the end face of the stainless steel pipe is rounded.

[0013] As a preferred embodiment of the present utility model, the total axial length of the flange inside the stainless steel pipe is not less than the wall thickness of the stainless steel pipe.

[0014] As a preferred embodiment of the present utility model, the total axial length of the flange inside the stainless steel pipe is not less than 50 mm.

[0015] As a preferred embodiment of the present utility model, the welding of the end of the stainless steel pipe to the stainless steel layer on the carbon steel shell is carried out with argon arc welding for backing.

[0016] As a preferred embodiment of the present utility model, after the welding of the end of the stainless steel pipe to the stainless steel layer on the carbon steel shell, boring is carried out along the inner diameter of the build-up welding on the carbon steel shell to remove the flange and the root of the weld on the inner wall of the stainless steel pipe.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. The outer surface of the carbon steel shell of the present utility model is built-up welded with a stainless steel layer, avoiding dissimilar steel welding when welding the stainless steel pipe and the carbon steel shell. The inner wall of the stainless steel pipe is provided with a flange, which is equivalent to welding with a backing plate. After welding, boring is carried out along the inner diameter of the build-up welding of the opening to remove the flange and the root of the weld on the inner wall of the pipe, thus ensuring the reliability of the welding quality.

[0019] 2. The welding structure of the present utility model has been subjected to welding process qualification, and all indicators meet the design requirements. Moreover, this welding structure solves the defect problems that may be brought about by dissimilar steel welding, and is more material-saving than the traditional standard structure, and the manufacturing process is also simple, which has great significance for reducing energy consumption and optimizing the manufacturing process. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the present utility model.

[0021] In the figure: 1 - stainless steel pipe; 2 - carbon steel shell; 3 - stainless steel layer; 4 - flange. Detailed Embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0024] As Figure 1 shown, the built-in welding structure of the stainless steel nozzle and the carbon steel shell of this embodiment includes a stainless steel nozzle 1 and a carbon steel shell 2. A stainless steel layer 3 is surfacing-welded on the outer surface of the carbon steel shell 2. A flange 4 is provided on the inner side of the end of the stainless steel nozzle 1. The end of the stainless steel nozzle 1 is welded to the stainless steel layer 3 on the carbon steel shell 2.

[0025] The stainless steel layer 3 is surfacing-welded on the outer surface of the carbon steel shell 2 of the present utility model to avoid dissimilar steel welding when welding the stainless steel nozzle 1 and the carbon steel shell 2. The inner wall of the stainless steel nozzle 1 has a flange 4, which is equivalent to welding with a backing plate. After welding, boring is carried out along the inner diameter of the opening by surfacing welding, and the flange 4 and the root of the weld on the inner wall of the nozzle are removed, so as to ensure the reliability of the welding quality.

[0026] The welding structure of the present utility model has undergone welding process qualification, and all indicators meet the design requirements. Moreover, this welding structure solves the defect problems that may be brought by dissimilar steel welding, and is more material-saving than the traditional standard structure, and the manufacturing process is also simple, which has great significance for reducing energy consumption and optimizing the manufacturing process.

[0027] Among them, the thickness of the stainless steel layer 3 surfacing-welded on the carbon steel shell 2 is not less than 6 mm.

[0028] The end face of the stainless steel nozzle 1 is chamfered, and the welding area is the area surrounded by the chamfered surface of the stainless steel nozzle 1, the flange 4 and the stainless steel layer 3. The chamfer of the stainless steel nozzle 1 is 30°±2°.

[0029] In order to make the solder fill the gap between the end of the stainless steel nozzle 1 and the stainless steel layer 3 on the carbon steel shell 2, a radial gap is left between the flange 4 extending from one end of the stainless steel nozzle 1 and the inner wall of the stainless steel nozzle 1. The connection between the flange 4 and the end face of the stainless steel nozzle 1 is rounded.

[0030] The total axial length of the flange 4 inside the stainless steel nozzle 1 is not less than the wall thickness of the stainless steel nozzle 1. Also, the total axial length of the flange 4 inside the stainless steel nozzle 1 is not less than 50 mm.

[0031] The welding of the end of the stainless steel nozzle 1 and the stainless steel layer 3 on the carbon steel shell 2 uses argon arc welding for backing.

[0032] After the welding of the end of the stainless steel nozzle 1 and the stainless steel layer 3 on the carbon steel shell 2, boring is carried out along the built-up welding inner diameter of the carbon steel shell 2 to remove the flange 4 and the weld root on the inner wall of the stainless steel nozzle 1.

[0033] Embodiment:

[0034] For the built-up welding structure of the stainless steel nozzle and the carbon steel shell, first, a 6-mm-thick stainless steel layer 3 is built up on the outer surface of the carbon steel shell 2 to avoid dissimilar steel welding here. The welding method of the fillet weld can use argon arc welding for backing. The inner wall of the stainless steel nozzle 1 has a flange 4, which is equivalent to welding with a backing plate. After welding, boring is carried out along the inner diameter of the built-up welding of the opening to remove the flange 4 and the weld root on the inner wall of the stainless steel nozzle 1, so as to ensure the reliability of the welding quality.

[0035] The present utility model is not limited to the above optional embodiments. Anyone can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they all fall within the protection scope of the present utility model.

Claims

1. An embedded welding structure of a stainless steel nozzle and a carbon steel shell, characterized in that: It includes a stainless steel connecting pipe (1) and a carbon steel shell (2). A stainless steel layer (3) is surfacing-welded on the outer surface of the carbon steel shell (2). A flange (4) is arranged on the inner side of the end of the stainless steel connecting pipe (1). The end of the stainless steel connecting pipe (1) is welded to the stainless steel layer (3) on the carbon steel shell (2).

2. The inserted welding structure of a stainless steel nozzle and a carbon steel shell according to claim 1, wherein: The thickness of the stainless steel layer (3) surfacing-welded on the carbon steel shell (2) is not less than 6 mm.

3. The placement welding structure of a stainless steel nozzle and a carbon steel shell according to claim 1, characterized in that: The end face of the stainless steel connecting pipe (1) is chamfered. The welding area is the area enclosed by the chamfered face of the stainless steel connecting pipe (1), the flange (4), and the stainless steel layer (3).

4. The placement welding structure of a stainless steel nozzle and a carbon steel shell according to claim 3, characterized in that: The chamfer of the stainless steel connecting pipe (1) is 30°±2°.

5. An installation welding structure of a stainless steel nozzle and a carbon steel shell according to claim 1, characterized in that: There is a radial gap between the end of the flange (4) extending out of the stainless steel connecting pipe (1) and the inner wall of the stainless steel connecting pipe (1).

6. The placement welding structure of a stainless steel nozzle and a carbon steel shell according to claim 1, characterized in that: The connection between the flange (4) and the end face of the stainless steel connecting pipe (1) is rounded.

7. An embedded welding structure of a stainless steel nozzle and a carbon steel shell according to claim 1, characterized in that: The total axial length of the flange (4) inside the stainless steel connecting pipe (1) is not less than the wall thickness of the stainless steel connecting pipe (1).

8. An embedded welding structure of a stainless steel nozzle and a carbon steel shell according to claim 1, characterized in that: The total axial length of the flange (4) inside the stainless steel connecting pipe (1) is not less than 50 mm.

9. The placement welding structure of a stainless steel nozzle and a carbon steel shell according to claim 1, characterized in that: The welding of the end of the stainless steel connecting pipe (1) to the stainless steel layer (3) on the carbon steel shell (2) uses argon arc welding for backing weld.

10. A welding structure for placing a stainless steel pipe joint on a carbon steel shell according to any one of claims 1 to 9, characterized in that: After the welding of the end of the stainless steel connecting pipe (1) to the stainless steel layer (3) on the carbon steel shell (2), boring is carried out along the surfacing inner diameter of the carbon steel shell (2) to remove the flange (4) and the root of the weld on the inner wall of the stainless steel connecting pipe (1).

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