Simple argon filling device for butt welding of stainless steel 90-degree elbow and conjoined flange

Abstract

The utility model discloses a simple argon filling device for butt welding of a stainless steel 90-degree bent pipe and a connected flange. The simple argon filling device comprises a tool bottom plate, a connected flange steel plate, a first pipeline, a second pipeline, a pipe plug and an argon filling pipe. 45-degree pipe notches are formed in the first pipeline and the second pipeline respectively, the other end of the second pipeline serves as a pipeline inlet, the connected flange steel plate is rectangular, and a pipeline outlet is formed in the center of the connected flange steel plate; the two ends of the tool bottom plate are correspondingly provided with a first 7-shaped clamping block and a second 7-shaped clamping block in parallel at intervals, and the two ends of the one-piece flange steel plate are matched with the inner sides of the first 7-shaped clamping block and the second 7-shaped clamping block respectively and clamped between the first 7-shaped clamping block and the second 7-shaped clamping block. The lower end of the first pipeline is combined with the upper surface of an outlet of the one-piece flange steel plate pipeline, the second pipeline and the first pipeline are combined through respective 45-degree pipe notches, the pipe plug is matched with a pipeline inlet of the second pipeline and can be inserted into the inner side of the pipeline inlet, and an argon filling pipe is arranged on the pipe plug in a penetrating mode. By means of the argon filling device, the argon filling problem of butt welding of the stainless steel 90-degree bent pipe and the connected flange can be effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of welding technology, specifically relating to a simple argon-filling device for butt welding of stainless steel 90° bend pipes and integrated flanges, which is suitable for butt welding of various pipes. Background Technology

[0002] Currently, when stainless steel pipes are butt-welded to each other or to plates, argon must be purged inside the pipes to ensure internal quality, protect the bottom weld from oxidation, and prevent welding defects. Generally, when pipes are welded to each other or to plates, workers use conventional methods for argon purging, such as sealing tapes and insulation cotton, which is usually sufficient. However, when butt-welding stainless steel 90° bends and integrated flanges, the following argon purging problems exist: (1) Various argon purging materials are prone to falling off during welding, resulting in poor leakage protection and directly affecting weld quality. Some welds even require rework due to excessive root welding defects. (2) Currently used argon purging materials are all disposable, wasting a lot of procurement costs. Therefore, for the butt-welding of stainless steel 90° bends and integrated flanges, a simple argon purging device needs to be designed that can be reused economically, safely, and reliably, without affecting the precision installation and welding of normal pipe-to-pipe and pipe-to-plate assemblies. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model provides a simple argon filling device for butt welding of stainless steel 90° bend pipes and integrated flanges, which can effectively solve the problem of argon filling for butt welding of stainless steel 90° bend pipes and integrated flanges.

[0004] The technical solution to the technical problem solved by this utility model is as follows:

[0005] According to one aspect of this utility model, a simple argon filling device for butt welding of a stainless steel 90° bend and an integrated flange is provided. The device includes a tooling base plate, an integrated flange steel plate, a first pipe, a second pipe, a pipe plug, and an argon filling pipe. The first and second pipes each have a 45° pipe cut on opposite sides. The other end of the second pipe serves as the pipe inlet. The integrated flange steel plate is rectangular, with a pipe outlet at its center that matches the inner diameter of the first pipe. The tooling base plate has a first "7"-shaped locking block and a second "7"-shaped locking block arranged parallel to each other at its two ends. The two ends of the integrated flange steel plate are respectively adapted to the inner sides of the first and second "7"-shaped locking blocks and locked between them. The lower end of the first pipe is combined with the upper surface of the pipe outlet of the integrated flange steel plate. The second pipe and the first pipe are combined through their respective 45° pipe cuts to form a 90° bend. The pipe plug is adapted to the pipe inlet of the second pipe and can be inserted into the inner side of the pipe inlet. The argon filling pipe passes through the pipe plug.

[0006] Furthermore, there is one first “7” shaped locking block, which is located at the center of one end of the tooling base plate, and there are two second “7” shaped locking blocks, which are located on the front and rear sides of one end of the tooling base plate, respectively.

[0007] The first "7" shaped clamping block is one in number and is set on the tooling base plate, which is machined from 20mm steel plate; the first "7" shaped clamping block and the second "7" shaped clamping block are machined from 60mm steel plate and welded to both ends of the tooling base plate; the pipe plug is machined from Φ120mm round bar; the argon filling tube is machined from Φ8mm seamless steel pipe.

[0008] According to another aspect of this utility model, a process for butt welding stainless steel 90° bend pipes and integrated flanges is provided, which is carried out using the simple argon purging device described in the above-mentioned technology, and the steps are as follows:

[0009] S1. Fabrication and setup of a simple argon filling device;

[0010] 1.1) Based on the specifications of the stainless steel 90° bend and integrated flange to be butt welded, tooling base plate, first "7" shaped clamping block, second "7" shaped clamping block, pipe plug and argon filling pipe are manufactured by machining steel plate, round bar and seamless steel pipe.

[0011] 1.2) Weld the first “7” shaped clamp and the second “7” shaped clamp to both ends of the upper surface of the tooling base plate respectively, weld the argon filling tube through and fix it to the pipe plug, insert the pipe plug into the pipe inlet of the second pipe, combine the second pipe, the first pipe and the integrated flange steel plate, and insert the integrated flange steel plate between the first “7” shaped clamp and the second “7” shaped clamp;

[0012] S2. Pre-welding preparation:

[0013] 2.1) Welding equipment: Manual argon arc welding and shielded metal arc welding combined welding machine, high-purity argon with a purity of 9999.9%; Welding materials: CHG-308L welding wire, argon arc welding wire φ2.5mm and φ3.0mm;

[0014] 2.2) Welding material: 0Cr18Ni9 stainless steel;

[0015] 2.3) Welding position: Fixed welding at 45°;

[0016] 2.4) Auxiliary facilities: angle grinder, file, hammer, chisel, face mask, template, thermometer, magnifying glass, insulation cotton;

[0017] 2.5) Pre-welding requirements: The welding area and welding materials must be free of oil, oxide layer, and moisture, and must expose the metallic luster;

[0018] 2.6) Welding technical requirements: Single-sided welding with double-sided forming, weld overlay fused to the base material, weld free of any welding defects and meeting design dimensions;

[0019] 2.7) Welding process parameters: Welding parameters are determined based on the welding equipment, welding materials, and welding requirements;

[0020] S3. Welding implementation;

[0021] 3.1) Clean the combination position of the first pipe and the pipe outlet on the integrated flange steel plate, as well as the combination position of the 45° pipe cut of the first pipe and the second pipe; connect the argon filling pipe to the argon source to supply gas, and then weld the bottom layer, filling layer and top layer of the two combinations in sequence to form the first weld and the second weld respectively.

[0022] 3.2) When welding the root pass at the two joints, use CHG-308L welding wire (φ2.5mm) on the welding machine, manual tungsten inert gas (TIG) welding, crescent-shaped electrode manipulation, and high-purity argon (9999.9%). Wrap both sides of the weld with damp cloths, continuously wetting the cloths with water during welding to ensure rapid cooling and prevent welding defects caused by excessively high temperatures in the stainless steel, which would affect weld quality. The angle between the welding wire and the horizontal plane of the pipe fitting should be 30-45°, and the angle between the welding torch and the horizontal plane of the pipe fitting should be 65-80°. The welding current should be 90-110A. For pipe-to-pipe and pipe-to-plate flange welding, start from the 6 o'clock position and weld symmetrically from bottom to top on both sides up to the 12 o'clock position. The root pass is single-sided welding with double-sided forming. After welding... After completion, the weld surface is cleaned to ensure there are no welding defects, and the weld is ground. The temperature of the weld and heat-affected zone is measured with a temperature gun and is less than 60°C before the filler layer and cap coat are welded. The welding process for the filler layer and cap coat is the same as that for the root pass, using φ3.0mm welding wire and a welding current of 120-140A. The cap coat is higher than the base material, and the weld sides are smoothly transitioned to the base material. After rapid cooling to room temperature, X-ray inspection is performed according to the pressure vessel non-destructive testing standard JB / T4730-2005, followed by standard mechanical property testing according to NB / T47016-2011. After the test results confirm that the requirements are met, the vessel is put into use.

[0023] Furthermore, the welding equipment is a YC-400TX4 combined manual argon arc welding and shielded metal arc welding machine.

[0024] Furthermore, when welding the root pass, the welding current is 90-110A, the arc voltage is 15-20V, the welding speed is 2.0-3.2mm / s, the heat input is 0.4-0.61kJ / mm, the welding method is GTAW, and the polarity is DCEP; when welding the filler and cap coat, the welding current is 120-140A, the arc voltage is 20-24V, the welding speed is 4.3-6.6mm / s, the heat input is 0.6-0.91kJ / mm, the welding method is GTAW, and the polarity is DCEP.

[0025] Furthermore, the weld seam of the cover layer is no more than 3mm higher than the base material.

[0026] Furthermore, argon gas is supplied 2 minutes in advance before welding.

[0027] Compared with the prior art, the present invention provides a simple argon filling device for butt welding of stainless steel 90° bend pipes and integrated flanges. This simple argon filling device is made of common materials, has low cost, good effect, and can be reused. Combined with its butt welding process, it can effectively solve the problem of argon filling welding for butt welding of stainless steel 90° bend pipes and integrated flanges. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the simple argon filling device described in this utility model;

[0029] Figure 2 for Figure 1 An explosion diagram;

[0030] Figure 3 This is a schematic diagram of the first or second pipe in this utility model;

[0031] In the diagram: 1. Tooling base plate; 21. First "7" shaped clamping block; 22. Second "7" shaped clamping block; 4. Integrated flange steel plate; 5. First pipe; 6. Second pipe; 7. Pipe plug; 8. Argon filling pipe; 9. First weld; 10. Pipe outlet; 11. Pipe inlet; 12. Second weld; 13. 45° pipe cut. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this disclosure pertains. The terms "upper," "lower," "left," "right," "front," and "back" used in the present patent application specification and claims are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Any aspects not detailed in the present utility model are well-known technologies to those skilled in the art.

[0033] Example 1:

[0034] like Figure 1-3As shown, this utility model provides a simple argon filling device for butt welding of a stainless steel 90° bend and an integrated flange. It includes a tooling base plate 1, an integrated flange steel plate 4, a first pipe 5, a second pipe 6, a pipe plug 7, and an argon filling pipe 8. The first pipe 5 and the second pipe 6 each have a 45° pipe cut 13 on opposite sides. The other end of the second pipe 6 serves as a pipe inlet 11. The integrated flange steel plate 4 is rectangular, with a pipe outlet 10 at its center that matches the inner diameter of the first pipe 5. The tooling base plate 1 has corresponding parallel spacing between the first "7" marks at both ends. The two ends of the integrated flange steel plate 4 are respectively adapted to the inner sides of the first "7" shaped clamp 21 and the second "7" shaped clamp 22 and are locked between them; the lower end of the first pipe 5 is combined with the upper surface of the pipe outlet 10 of the integrated flange steel plate 4 to form a welded flange; the second pipe 6 and the first pipe 5 are combined through their respective 45° pipe cuts 13 to form a 90° bend; the pipe plug 7 is adapted to the pipe inlet 11 of the second pipe 6 and can be inserted into the inner side of the pipe inlet 11; an argon filling pipe 8 is installed through the pipe plug 7.

[0035] In a preferred embodiment, there is one first “7” shaped locking block 21, which is located at the center of one end of the tooling base plate 1, and there are two second “7” shaped locking blocks 22, which are located on the front and rear sides of one end of the tooling base plate 1, respectively.

[0036] As a preferred embodiment, the tooling base plate 1 is machined from 20mm steel plate; the first "7" shaped clamping block 21 and the second "7" shaped clamping block 22 are machined from 60mm steel plate and welded to both ends of the tooling base plate 1; the pipe plug 7 is machined from Φ120mm round bar; and the argon filling pipe 8 is machined from Φ8mm seamless steel pipe.

[0037] In application, firstly, according to the specifications of the butt-welded stainless steel 90° bend and the integrated flange, each component is made. The first "7" shaped clamp 21 and the second "7" shaped clamp 2 are welded and fixed to the upper ends of the tooling base plate 1, respectively. Then, the argon filling pipe 8 is welded and fixed to the pipe plug 7. Then, the pipe plug 7 is inserted into the inner hole of the second pipe 6 to prevent the pipe inlet 11 from leaking. Then, the integrated flange steel plate 4, the first pipe 5, and the second pipe 6 are fixed together. When the first pipe 5 is combined with the second pipe 6 and the integrated flange steel plate 4, the two combined points can be fixed by means of existing clamps or by bridging, spot fixing, etc. Finally, the body flange steel plate 4 is inserted between the first "7" shaped clamp 21 and the second "7" shaped clamp 2 to prevent the pipe outlet 10 from leaking, to ensure that argon gas is delivered from the argon filling pipe 8, and to ensure that the first weld 9 and the second weld 12 formed at the two combined points have good internal quality and ensure welding quality.

[0038] Example 2:

[0039] This utility model provides a butt welding process for a stainless steel 90° bend pipe and an integral flange, which is carried out using the simple argon purging device in Example 1, and the steps are as follows:

[0040] S1. Fabrication and setup of a simple argon filling device;

[0041] 1.1 According to the specifications of the stainless steel 90° bend and the integrated flange to be butt welded, the tooling base plate 1, the first "7" shaped clamping block 21, the second "7" shaped clamping block 22, the pipe plug 7 and the argon filling pipe 8 are manufactured by machining steel plates, round bars and seamless steel pipes.

[0042] 1.2 Weld the first “7” shaped clamping block 21 and the second “7” shaped clamping block 22 to both ends of the upper surface of the tooling base plate 1 respectively. Weld the argon filling tube 8 through and fix it to the pipe plug 7. Insert the pipe plug 7 into the pipe inlet 11 of the second pipe 6. Combine the second pipe 6, the first pipe 5 and the integrated flange steel plate 4. Insert the integrated flange steel plate 4 between the first “7” shaped clamping block 21 and the second “7” shaped clamping block 22.

[0043] S2. Pre-welding preparation:

[0044] 2.1 Welding equipment: Panasonic YC-400TX4 manual TIG welding and shielded metal arc welding combined welding machine, high purity argon 9999.9%; welding materials: CHG-308L welding wire, TIG welding wire φ2.5mm and φ3.0mm.

[0045] 2.2 Welding material: 0Cr18Ni9 stainless steel;

[0046] 2.3 Welding position: Fixed welding at 45°;

[0047] 2.4 Auxiliary facilities: angle grinder, file, hammer, chisel, face mask, template, thermometer, magnifying glass, insulation cotton;

[0048] 2.5 Pre-welding requirements: The welding area and welding materials must be free of oil, oxide layer and moisture, and the metal luster must be exposed; remove rust, grease and moisture using an oxyacetylene torch, and then grind with sandpaper or a grinding wheel to remove rust.

[0049] 2.6 Welding technical requirements: Single-sided welding with double-sided forming, weld overlay fused to the base material, weld free of any welding defects and meeting design dimensions;

[0050] 2.7 Welding process parameters: Welding parameters shall be determined based on the welding equipment, welding materials and welding requirements;

[0051] Welding process parameters

[0052] Weld layers Weldmethod welding method Filler material (filler metal) Φ (mm) Amps current (A) Volts (V) Polarity Welding speed (mm / s) Welding speed (mm / s) Heat input (kJ / mm) bottom layer GTAW CHG-308L Φ2.5 90-110 15-20 DCEP 2.0-3.2 -- 0.4-0.61 Filling, covering GTAW CHG-308L Φ3.0 120-140 20-24 DCEP 4.3-6.6 -- 0.6-0.91

[0053] S3. Welding implementation;

[0054] 3.1 Clean the combination location of the pipe outlet 10 on the first pipe 5 and the integrated flange steel plate 4, as well as the combination location of the 45° pipe cut 13 of the first pipe 5 and the second pipe 6; connect the argon filling pipe 8 to the argon source for gas supply, preferably supplying gas 2 minutes in advance, and then perform the welding of the bottom layer, filling layer and top layer at the two combinations in sequence, forming the first weld 9 and the second weld 12 respectively;

[0055] 3.2 When welding the root pass at the two joints, use CHG-308L welding wire (φ2.5mm) on the welding machine, manual tungsten inert gas (TIG) welding, crescent-shaped electrode manipulation, and high-purity argon (9999.9%). Wrap both sides of the weld with damp cloths, continuously wetting the cloths with water during welding to ensure rapid cooling and prevent welding defects caused by excessively high temperatures in the stainless steel, which would affect weld quality. The angle between the welding wire and the horizontal plane of the pipe fitting should be 30-45°, and the angle between the welding torch and the horizontal plane of the pipe fitting should be 65-80°. The welding current should be 90-110A. For pipe-to-pipe and pipe-to-plate flange welding, start from the 6 o'clock position and weld symmetrically from bottom to top on both sides up to the 12 o'clock position. The root pass is single-sided welding with double-sided forming. After welding, clean the weld. The weld surface is inspected to ensure there are no welding defects, and the weld is ground. The temperature of the weld and heat-affected zone is measured with a temperature gun and is less than 60°C before the filler layer and cap coat are welded. The welding process for the filler layer and cap coat is the same as that for the root pass, using φ3.0mm welding wire and a welding current of 120-140A. The cap coat is higher than the base material but not more than 3mm. The weld sides are smoothly transitioned to the base material. After rapid cooling to room temperature, X-ray inspection is performed according to the pressure vessel non-destructive testing standard JB / T4730-2005, followed by standard mechanical property testing according to NB / T47016-2011. After the test results confirm that the requirements are met, the vessel is put into use.

Claims

1. A simple argon-filling device for butt welding of a stainless steel 90° bend and an integral flange, characterized in that, The fixture includes a base plate (1), a continuous flange plate (4), a first pipe (5), a second pipe (6), a pipe plug (7), and an argon filling pipe (8). The first pipe (5) and the second pipe (6) each have a 45° pipe cut (13) on one side opposite to each other. The other end of the second pipe (6) serves as a pipe inlet (11). The continuous flange plate (4) is rectangular, with a pipe outlet (10) at its center that matches the inner diameter of the first pipe (5). The base plate (1) has a first "7" shaped clamp (21) and a second "7" shaped clamp (22) arranged parallel to each other at both ends. The two ends of the integrated flange steel plate (4) are respectively adapted to the inner sides of the first "7" shaped clamp (21) and the second "7" shaped clamp (22) and are clamped between the two; the lower end of the first pipe (5) is combined with the upper surface of the pipe outlet (10) of the integrated flange steel plate (4); the second pipe (6) and the first pipe (5) are combined through their respective 45° pipe cuts (13) to form a 90° bend; the pipe plug (7) is adapted to the pipe inlet (11) of the second pipe (6) and can be inserted into the inner side of the pipe inlet (11); the argon filling pipe (8) is installed through the pipe plug (7).

2. The simple argon-filling device for butt welding of a stainless steel 90° bend and integrated flange according to claim 1, characterized in that, The first "7" shaped card block (21) is one, and is located at the center of one side end of the tooling base plate (1). The second "7" shaped card block (22) is two, and is located on the front and rear sides of one side end of the tooling base plate (1).

3. The simple argon-filling device for butt welding of a stainless steel 90° bend and integrated flange according to claim 1, characterized in that, The tooling base plate (1) is machined from 20mm steel plate; the first "7" shaped clamp (21) and the second "7" shaped clamp (22) are machined from 60mm steel plate and welded to both ends of the tooling base plate (1); the pipe plug (7) is machined from Φ120mm round bar; the argon filling pipe (8) is machined from Φ8mm seamless steel pipe.

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