CN113210810B - Secondary stainless steel pipe welding inert gas protection device and protection method - Google Patents
Secondary stainless steel pipe welding inert gas protection device and protection method Download PDFInfo
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- CN113210810B CN113210810B CN202110530248.9A CN202110530248A CN113210810B CN 113210810 B CN113210810 B CN 113210810B CN 202110530248 A CN202110530248 A CN 202110530248A CN 113210810 B CN113210810 B CN 113210810B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
Abstract
The invention discloses a secondary stainless steel tube welding inert gas protection device and a protection method, comprising an exhaust tee joint and an inflation sleeve structure; the exhaust tee joint is provided with a connecting pipe part connected with the valve short pipe and the inflation sleeve structure and an exhaust pipe part communicated with the side surface of the exhaust tee joint; the exhaust pipe part of the exhaust tee joint is sealed by a sealing cap; the inflation sleeve structure is provided with an air supply pipe which can extend to a valve core of the valve; the end part of the gas supply pipe exposed to one end of the gas-filled sleeve structure is communicated with external inert gas source equipment. The protection device of the invention utilizes the structure of the inflation sleeve to be connected with the exhaust tee joint, the structure of the inflation sleeve to be connected with the secondary piping, and simultaneously designs the air supply pipe which can adjust and limit the position, so that the welding seam is protected by high-purity inert gas during the welding of the pipeline, the oxidation phenomenon is avoided, the pressure of the inert gas at the welding seam to the inner wall of the pipeline is ensured to be kept stable during the welding process, and the local concave of the welding seam at the inner wall of the pipeline is avoided.
Description
Technical Field
The invention relates to the technical field of welding processes, in particular to a secondary stainless steel pipe welding inert gas protection device and a protection method.
Background
Argon tungsten arc welding refers to gas shielded welding in which pure tungsten or activated tungsten and the like are used as electrodes and inert gas such as argon and the like is used as protective gas. The modern industries such as electronics and pharmacy have very strict requirements on welding of stainless steel pipelines, on one hand, the purity of protective gas is very high, and on the other hand, 99.999 percent of argon and the like are usually adopted for protection, so that oxygen molecules are prevented from appearing, otherwise, the oxidation phenomenon can occur, and the welding quality is influenced; on the other hand, the weld on the inner wall of the pipe is very smooth and does not allow for pitting. At present, when the welding is joined in marriage to the stainless steel pipeline secondary in the factory building, it is fixed with secondary piping earlier, carry out the tack welding with secondary piping and valve nozzle stub again, the secondary piping other end is sealed with the apron, a round hole is reserved at the apron middle part, insert the secondary piping from the round hole with welding inert shielding gas hose in, open inert gas source valve, because the valve on the branch pipe is closed, after inert gas filled with secondary piping, discharge from the welding seam department of secondary piping and valve nozzle stub tack welding. And (5) welding the welding line, and closing the inert gas source valve to finish welding the welding line when the welding is to be finished.
The inert gas protection method for welding the secondary stainless steel pipeline in the prior art has the following defects:
1. when welding, inert gas enters from one end of the secondary distribution pipeline and is discharged from the welding seam, and because the pipeline valve is closed, the valve short pipe is the tail end of the secondary distribution pipeline, the original air in the space is extruded at the end of the pipeline by the inert gas and cannot be discharged, and a small amount of oxygen is generated at the welding seam, so that the oxidation phenomenon can occur, and the welding quality is influenced.
2. Along with the continuous completion of the welding seam, the discharge amount of the inert gas in the pipeline from the welding seam is reduced, and the gas supply amount of the inert gas source is not reduced, so that the pressure of the inert gas on the inner wall of the pipeline is gradually increased, the welding seam on the inner wall of the pipeline is locally concave, and the forming quality of the welding seam is influenced.
Therefore, in order to solve the above technical problems, those skilled in the art need to develop a novel inert gas protection device for welding a secondary stainless steel pipe.
Disclosure of Invention
The invention aims to provide an inert gas protection device which is novel in structure, improves the quality of welding seams and is suitable for secondary stainless steel pipe welding.
In order to achieve the above purpose, the invention provides the following technical scheme:
The invention relates to a secondary stainless steel tube welding inert gas protection device, which comprises:
an exhaust tee joint which is butted and fixedly connected with the valve short pipe of the valve;
the inflation sleeve structure is arranged at one end of the exhaust tee far away from the valve short pipe or on a secondary distribution pipeline at one end of the exhaust tee far away from the valve short pipe;
the inflation sleeve structure is provided with an air supply pipe which can extend to a valve core of the valve;
the end part of the gas supply pipe, which is exposed to one end of the inflation casing pipe structure, is communicated with external inert gas source equipment to receive the inert gas delivered by the inert gas source;
the inert gas source conveys inert gas into the valve short pipe or the secondary distribution pipeline through the gas supply pipe;
the exhaust tee joint is provided with a connecting pipe part matched with the valve short pipe, the inflation sleeve structure and the secondary pipe distribution pipeline, and an exhaust pipe part communicated with the side face of the exhaust tee joint;
the pipe diameter of the exhaust pipe part of the exhaust tee is the same as that of the air supply pipe;
and the exhaust pipe part of the exhaust tee joint is sealed by a sealing cap.
Furthermore, the connecting pipe part of the exhaust tee joint close to one side of the valve short pipe is butted with the valve short pipe and fixedly connected with the valve short pipe in a positioning welding mode;
The connecting pipe part of the exhaust tee joint, which is far away from one side of the valve short pipe, is connected with the inflation sleeve structure or the secondary piping;
and the pipe diameter of the connecting pipe part of the exhaust tee is consistent with that of the valve short pipe or the secondary distribution pipeline.
Further, the inflation tube structure includes:
the sleeve is matched with the connecting pipe part of the exhaust tee; and
the cover plate is formed at the end part of one end of the sleeve, which is far away from the exhaust tee joint;
the cover plate and the sleeve are of an integrated structure;
the lower end of the sleeve is open;
the pipe diameter of the sleeve is larger than that of the connecting pipe part of the exhaust tee joint, and the difference value between the pipe diameter of the sleeve and the pipe diameter of the connecting pipe part is 1-2 mm;
the pipe diameter of the sleeve is larger than that of the secondary distribution pipeline, and the difference value between the pipe diameter of the sleeve and the pipe diameter of the secondary distribution pipeline is 1-2 mm;
the sleeve is sleeved on the connecting pipe part or the secondary distribution pipeline;
this inflatable sleeve structure still includes:
the gas supply pipe;
the center of the cover plate is provided with a through hole, and the air supply pipe penetrates through the through hole of the cover plate and extends to the valve core of the valve or the secondary distribution pipeline.
Further, the air supply pipe is provided with a clamping sleeve joint assembly;
the clamping sleeve joint component is divided into a fixed clamping sleeve joint integrated at the end part of the air supply pipe far away from one end of the sleeve and a movable clamping sleeve joint integrated at one end of the air supply pipe close to the sleeve;
the air supply pipe is fixedly assembled with the cover plate through the movable clamping sleeve joint, the inner diameter of the movable clamping sleeve joint is larger than the outer diameter of the air supply pipe, and the air supply pipe slides in the movable clamping sleeve joint;
and the external inert gas source equipment is connected with the gas supply pipe through a hose and is connected with the fixing clamp sleeve joint.
Further, the fixed bayonet joint is configured to be a circular disc structure with a cross-sectional dimension larger than that of the air supply pipe.
Further, the movable clamping sleeve joint comprises a first movable clamping sleeve joint and a second movable clamping sleeve joint;
the second movable clamping sleeve joint is arranged close to the cover plate, and the outer diameter of the second movable clamping sleeve joint is consistent with the inner diameter of the through hole;
the section size of the first movable clamping sleeve joint is larger than that of the second movable clamping sleeve joint;
the second movable clamping sleeve joint is embedded into the through hole to realize the assembly and fixation of the air supply pipe and the cover plate.
Furthermore, the air supply pipe is connected with a movable sealing plug in a sliding manner;
the movable sealing plug is made of rubber or silica gel;
one end of the movable sealing plug, which is close to the movable clamping sleeve joint, is provided with an embedded body in a downward protruding way;
the embedding body can be embedded into a space between the movable clamping sleeve joint and the air supply pipe so as to limit the sliding of the air supply pipe;
the movable sealing plug is in interference fit with the air supply pipe.
The invention discloses a welding protection method of a secondary stainless steel tube welding inert gas protection device, which mainly comprises the following steps:
s101, measuring the distance from the end of the short valve pipe to a valve core of the valve by using a ruler, and measuring the distance between two ends of the exhaust tee joint;
s102, aligning the exhaust tee joint with the valve short pipe, and fixing the exhaust tee joint by positioning welding;
s103, sleeving a sleeve of an inflatable sleeve structure on a connecting pipe part at the upper end of an exhaust tee joint, adjusting the position of an air supply pipe, ensuring that the end of the air supply pipe is 5-10 mm away from a valve core of a valve, and fixing the position of the air supply pipe by adopting a movable sealing plug and a movable clamping and sleeving head;
s104, connecting inert gas source equipment with a fixed clamping sleeve joint at the upper end of a gas supply pipe by using a hose;
S105, opening a valve of inert gas source equipment, and filling inert gas into the short valve pipe and the exhaust tee by using the gas supply pipe;
s106, detaching a sealing cap on the exhaust pipe part, and welding the welding line;
s107, after welding is finished, when the temperature of the welding seam is reduced to room temperature, closing a valve of inert gas source equipment, and detaching the inflatable sleeve structure;
s108, aligning the exhaust tee joint with the secondary piping, and fixing by positioning welding;
s109, sleeving the other end of the secondary distribution pipeline with an inflation sleeve structure, adjusting the position of the air supply pipe to enable the air supply pipe to extend into the secondary distribution pipeline, and fixing the position of the air supply pipe through a movable sealing plug and a movable clamping sleeve joint; opening an inert gas source equipment valve, filling inert gas into the secondary piping through a gas supply pipe, and welding a welding seam;
and S110, after welding is finished, when the temperature of the welding seam is reduced to room temperature, closing a valve of inert gas source equipment, detaching the inflating sleeve structure, and installing a sealing cap on the exhaust pipe part.
In the technical scheme, the secondary stainless steel tube welding inert gas protection device and the protection method provided by the invention have the following beneficial effects:
the protection device of the invention is that an exhaust tee joint is arranged between a short valve pipe and a secondary distribution pipeline, an inflation sleeve structure is arranged at the other end of the secondary distribution pipeline, and inert gas enters and fills the pipeline from an air supply pipe of the inflation sleeve structure at one end of the secondary distribution pipeline during welding and is exhausted from an exhaust pipe part at one side of the exhaust tee joint, so that on one hand, the welding seam of the pipeline can be ensured to be under the protection of high-purity inert gas, and the oxidation phenomenon caused by oxygen during welding is avoided; on the other hand, because the pipe diameters of the air supply pipe and the exhaust pipe part on one side of the exhaust tee joint are the same, the air supply and exhaust flow of the inert gas in the pipeline are the same, the pressure of the inert gas on the inner wall of the pipeline cannot be changed, the phenomenon that the gas pressure in the pipeline is increased when the pipeline welding seam is about to be finished and the welding seam is locally concave is avoided, and the forming quality of the welding seam is ensured. When the short pipe of the valve and the three-way vent are welded, the structure of the inflation sleeve is connected with the three-way vent, an air supply pipe capable of adjusting and limiting the position is designed, the relative position of the air supply pipe is adjusted according to the position of the valve core of the valve, the air supply pipe fills inert gas to the valve core of the valve, and air in the short pipe of the valve is extruded out of the exhaust pipe part on one side of the three-way vent, so that the welding seam of the pipeline can be protected by the high-purity inert gas, and the oxidation phenomenon of the welding seam is avoided; because the pipe diameters of the air supply pipe and the exhaust pipe part on one side of the exhaust tee joint are the same, the phenomenon that the welding line on the inner wall of the pipeline is locally concave can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic structural diagram of a secondary stainless steel tube welding inert gas protection device according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the connection structure of the gas supply pipe of the inert gas protection device for the secondary stainless steel pipe welding according to the embodiment of the present invention;
fig. 3 is a working state diagram of the inert gas protection device for welding the secondary stainless steel distribution pipe during welding the secondary pipe distribution pipeline according to the embodiment of the present invention.
Description of the reference numerals:
1. a valve; 2. a short valve pipe; 3. an exhaust tee; 4. an inflatable sleeve structure; 5. secondary pipeline distribution;
301. a connecting pipe portion; 302. an exhaust pipe portion; 303. a sealing cap;
401. a sleeve; 402. a gas supply pipe; 403. fixing the clamping sleeve joint; 404. a movable card sleeve joint;
40101. a through hole; 40102. a cover plate;
40401. A first movable ferrule fitting; 40402. a second movable card sleeve joint; 40403. a movable sealing plug.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the accompanying drawings.
See fig. 1-3;
the invention relates to a secondary stainless steel tube welding inert gas protection device, which comprises:
an exhaust tee 3 which is butted and fixedly connected with the valve short pipe 2 of the valve 1;
the inflation sleeve structure 4 is arranged at one end of the exhaust tee 3 far away from the valve short pipe 2 or on a secondary distribution pipeline 5 at one end of the exhaust tee 3 far away from the valve short pipe 2;
the gas-filled jacket structure 4 has a gas supply pipe 402 that can extend to the valve core of the valve 1;
the end part of the gas supply pipe 402 exposed to one end of the gas filled casing structure 4 is communicated with an external inert gas source device to receive inert gas delivered by an inert gas source;
the inert gas source transmits inert gas into the valve short pipe 2 or the secondary distribution pipe 5 through the gas supply pipe 402;
the exhaust tee joint 3 is provided with a connecting pipe part 301 matched with the valve short pipe 2, the inflation sleeve structure 4 and the secondary distribution pipe 5 and an exhaust pipe part 302 communicated with the side surface of the exhaust tee joint 3;
The pipe diameter of the exhaust pipe part 302 of the exhaust tee 3 is the same as that of the gas supply pipe 402;
the exhaust pipe portion 302 of the exhaust tee 3 is sealed with a seal cap 303.
As the preferable structure of this embodiment, the connecting pipe portion 301 of the exhaust tee 3 near the valve short pipe 2 is butt-jointed and fixedly welded to the valve short pipe 2; a connecting pipe part 301 of the exhaust tee 3, which is far away from one side of the valve short pipe 2, is connected with the inflation sleeve structure 4 or the secondary distribution pipe 5; the pipe diameter of the connecting pipe part 301 of the exhaust tee 3 is consistent with that of the valve short pipe 2 or the secondary distribution pipe 5.
Specifically, this embodiment discloses an inert gas protection device suitable for secondary joins in marriage stainless steel pipe welding usefulness, and the device includes the tee bend 3 that exhausts with the butt joint of valve stub 2 of valve 1 and fix a position through the tack weld, and wherein, this tee bend 3 that exhausts divides into three open end, is two connecting tube portion 301 and an exhaust tube portion 302 respectively, and wherein, the connecting tube portion 301 of below docks with valve stub 2, and the connecting tube portion 301 of top docks with secondary piping 5 to link firmly through the tack weld. The purpose of the exhaust tee joint 3 is that when the welding seam is welded, inert gas enters from the gas supply pipe 402 of the gas-filled sleeve structure 4 at the other end of the secondary distribution pipe 5 and fills the pipe, and is exhausted from the exhaust pipe part 302 of the exhaust tee joint 3, so that on one hand, the welding seam of the pipe can be ensured to be protected by high-purity inert gas, and the oxidation phenomenon caused by oxygen in the welding process is avoided; on the other hand, because the pipe diameters of the gas supply pipe 402 and the exhaust pipe part 302 on one side of the exhaust tee joint 3 are the same, in the welding process, the gas supply of the inert gas is the same as the discharged flow, the pressure of the inert gas on the inner wall of the pipeline at the welding seam cannot be changed, the phenomenon that the pressure of the inner wall of the pipeline is increased when the pipeline welding is about to be completed and the welding seam on the inner wall of the pipeline is locally concave is avoided, and the forming quality of the welding seam is ensured.
When welding valve nozzle stub 2 and exhaust tee 3, the connecting tube portion 301 of top then is connected with foretell gas filled tube structure 4, the gas filled tube structure 4 of this embodiment has the air supply pipe 402 that runs through, this air supply pipe 402 can extend and fix to valve 1's case department according to the position of valve 1 case, the purpose makes inert gas can all be full of and extrude the air in the valve nozzle stub 2 when the welding, also avoid valve 1 case to be damaged by stainless steel's air supply pipe 402 in the operation simultaneously, effectively protect valve 1 case. Meanwhile, the inflation sleeve structure 4 is connected with the connecting pipe part 301 of the exhaust tee joint 3, the gas supply pipe 402 can be ensured to completely fill inert gas into the valve short pipe 2, air is extruded out of the exhaust pipe part 302 on one side of the exhaust tee joint 3, on one hand, the pipeline welding line can be ensured to be in high-purity inert gas protection, oxidation caused by oxygen in welding is avoided, on the other hand, the gas supply pipe 402 is the same as the pipe diameter of the exhaust pipe part 302 on one side of the exhaust tee joint 3, in the welding process, the gas supply and the exhaust flow of the inert gas are the same, the pressure of the inert gas on the inner wall of the pipeline at the welding line cannot be changed, the pressure increase in the pipeline when welding is to be finished is avoided, the welding line on the inner wall of the pipeline has a local concave phenomenon, and the forming quality of the welding line is ensured.
Wherein, above-mentioned inflatable bushing structure 4 includes:
a sleeve 401 fitted to the connecting pipe portion 301 of the three-way exhaust pipe 3; and a cover plate 40102 formed at the end of the sleeve 401 far away from the end of the exhaust tee 3;
the cover plate 40102 and the sleeve 401 are of an integrated structure;
the lower end of the sleeve 401 is open;
the pipe diameter of the sleeve 401 is larger than that of the connecting pipe part 301 of the exhaust tee 3, and the difference between the pipe diameter of the sleeve 401 and that of the connecting pipe part 301 is 1-2 mm;
the pipe diameter of the sleeve 401 is larger than that of the secondary distribution pipeline 5, and the difference between the pipe diameter of the sleeve 401 and the pipe diameter of the secondary distribution pipeline 5 is 1-2 mm;
the sleeve 401 is sleeved on the connecting pipe part 301 or the secondary distribution pipe 5;
the inflation cuff structure 4 further includes:
the gas supply pipe 402;
a through hole 40101 is formed in the center of the cover plate 40102, and the gas supply pipe 402 passes through the through hole 40101 of the cover plate 40102 and extends to the valve core of the valve 1 or the secondary distribution pipe 5.
The concrete structure of the inflation sleeve structure 4 and the installation structure of the exhaust tee 3 are described in detail, wherein the inflation sleeve structure comprises a sleeve 401 capable of being sleeved on a connecting pipe part 301 at the upper end of the exhaust tee 3, a cover plate 40102 located at the upper end of the sleeve 401, and an air supply pipe 402 capable of penetrating through the cover plate 40102, wherein the air supply pipe 402 can be fixedly positioned on the cover plate 40102.
More specifically, the method comprises the following steps:
the gas supply pipe 402 has a ferrule adapter assembly;
the ferrule adapter assembly is divided into a fixed ferrule adapter 403 integrated at the end of the gas supply pipe 402 away from the sleeve 401 and a movable ferrule adapter 404 integrated at the end of the gas supply pipe 402 close to the sleeve 401;
the air supply pipe 402 is fixedly assembled with the cover plate 40102 through the movable clamping sleeve joint 404, the inner diameter of the movable clamping sleeve joint 404 is larger than the outer diameter of the air supply pipe 402, and the air supply pipe 402 slides in the movable clamping sleeve joint 404;
an external inert gas supply device is connected to the fixed bayonet joint 403 through a hose and gas supply pipe 402.
During the use, need adjust the length that stretches into of air supply pipe 402 according to the position of valve 1 case, consequently, the air supply pipe 402 one end of this embodiment has designed movable joint 404.
Specifically, the fixing clip connector 403 in this embodiment is configured as a circular disk structure with a cross-sectional dimension larger than that of the air supply pipe 402.
The active ferrule joint 404 includes a first active ferrule joint 40401 and a second active ferrule joint 40402;
the second movable bayonet joint 40402 is arranged close to the cover plate 40102, and the outer diameter of the second movable bayonet joint 40402 is consistent with the inner diameter of the through hole 40101;
The cross-sectional dimension of the first movable bayonet joint 40401 is greater than the cross-sectional dimension of the second movable bayonet joint 40402;
the second movable clamping sleeve joint 40402 is embedded in the through hole 40101 to realize the assembly fixation of the air supply pipe 402 and the cover plate 40102.
In consideration of the fixing problem of the air supply pipe 402, a movable sealing plug 40403 is slidably connected to the air supply pipe 402 of the present embodiment;
the movable sealing plug 40403 is made of rubber or silica gel;
an embedded body is downwards protruded from one end of the movable sealing plug 40403 close to the movable clamping sleeve joint 404;
the insert body can be inserted into the space between the movable bayonet joint 404 and the air supply pipe 402 to limit the air supply pipe from sliding;
the moveable sealing plug 40403 is an interference fit with the gas supply pipe 402.
When the length of stretching into of fixed air supply pipe 402, at first with second activity joint 40402 embedding through-hole 40101 in, but the external diameter of the air supply pipe 402 of this embodiment is less than the internal diameter that the joint 404 was cup jointed to the activity card, consequently, has certain space between the two, guarantees that air supply pipe 402 can move about, simultaneously, has designed the movable sealing plug 40403 of foretell rubber or silica gel material, through embedding the convex embedding body in activity sealing plug 40403 lower extreme into this space, just can realize the location of air supply pipe 402 with interference fit's mode fixed. The disassembly and the assembly are convenient. The movable sealing plug 40403 is used to fix the position of the gas supply pipe 402, so as to prevent the valve core of the valve 1 from being damaged by the end of the gas supply pipe 402 made of stainless steel during welding operation, and to effectively protect the valve core of the valve 1.
The invention discloses a welding protection method of a welding inert gas protection device for a secondary stainless steel pipe, which mainly comprises the following steps:
s101, measuring the distance from the end of the short valve pipe 2 to the valve core of the valve 1 by using a ruler, and measuring the distance between two ends of the exhaust tee 3;
s102, aligning the exhaust tee joint 3 with the valve short pipe 2, and fixing by positioning welding;
s103, sleeving a sleeve 401 of the inflation sleeve structure 4 on a connecting pipe part 301 at the upper end of an exhaust tee 3, adjusting the position of an air supply pipe 402 to ensure that the distance between the end of the air supply pipe 402 and a valve core of a valve 1 is 5-10 mm, and fixing the position of the air supply pipe 402 by adopting a movable sealing plug 40403 and a movable clamping sleeve joint 404;
s104, connecting inert gas source equipment with a fixed clamping sleeve joint 403 at the upper end of a gas supply pipe 402 by using a hose;
s105, opening a valve of inert gas source equipment, and filling inert gas into the valve short pipe 2 and the exhaust tee 3 by using the gas supply pipe 402;
s106, detaching the sealing cap 303 on the exhaust pipe part 302, and welding the welding seam;
s107, after welding is finished, when the temperature of the welding seam is reduced to the room temperature, closing a valve of inert gas source equipment, and detaching the inflation sleeve structure 4;
S108, aligning the exhaust tee joint 3 with the secondary distribution pipeline 5, and fixing by positioning welding;
s109, sleeving the other end of the secondary distribution pipeline 5 on the inflation sleeve structure 4, adjusting the position of the air supply pipe 402 to enable the air supply pipe 402 to extend into the secondary distribution pipeline 5, and fixing the position of the air supply pipe 402 through the movable sealing plug 40403 and the movable clamping sleeve joint 404; opening an inert gas source equipment valve, filling inert gas into the secondary distribution pipeline 5 through the gas supply pipe 402, and welding the welding seam;
s110, after welding, when the temperature of the welding seam is reduced to room temperature, closing a valve of inert gas source equipment, detaching the inflation casing pipe structure 4, and installing a sealing cap 303 on the exhaust pipe part 302.
In the technical scheme, the secondary stainless steel tube welding inert gas protection device and the protection method thereof provided by the invention have the following beneficial effects:
the protection device of the invention is that an exhaust tee 3 is arranged between a valve short pipe 2 and a secondary distribution pipeline 5, an inflation sleeve structure 4 is arranged at the other end of the secondary distribution pipeline 5, and inert gas enters from an air supply pipe 402 of the inflation sleeve structure 4 at one end of the secondary distribution pipeline 5 and fills the pipeline during welding and is discharged from an exhaust pipe part 302 at one side of the exhaust tee 3, so that on one hand, the welding seam of the pipeline can be ensured to be protected by high-purity inert gas, and the oxidation phenomenon caused by oxygen during welding can be avoided; on the other hand, because the pipe diameters of the gas supply pipe 402 and the exhaust pipe part 302 on one side of the exhaust tee joint 3 are the same, the gas supply and exhaust flow of the inert gas in the pipeline are the same, the pressure of the inert gas on the inner wall of the pipeline cannot be changed, the phenomenon that the gas pressure in the pipeline is increased when the pipeline welding seam is about to be finished and the welding seam is locally concave is avoided, and the forming quality of the welding seam is ensured. When the valve short pipe 2 and the exhaust tee joint 3 are welded, the inflation sleeve structure 4 is connected with the exhaust tee joint 3, the gas supply pipe 402 capable of adjusting and limiting the position is designed, the relative position of the gas supply pipe 402 is adjusted according to the position of the valve core of the valve 1, the gas supply pipe 402 fills inert gas to the valve core of the valve 1, the air in the valve short pipe is extruded out of the exhaust pipe part 302 on one side of the exhaust tee joint 3, the welding seam of the pipeline can be ensured to be protected by the high-purity inert gas, and the phenomenon of oxidation of the welding seam is avoided; because the pipe diameters of the air supply pipe 402 and the exhaust pipe part 302 on one side of the exhaust tee 3 are the same, the phenomenon that the welding line on the inner wall of the pipeline is locally concave can also be avoided.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (2)
1. The utility model provides a stainless steel tube welding inert gas protection device is joined in marriage to secondary which characterized in that, this protection device includes:
an exhaust tee joint (3) which is butted and fixedly connected with the valve short pipe (2) of the valve (1);
the inflation sleeve structure (4) is arranged at one end of the exhaust tee joint (3) far away from the valve short pipe (2) or on a secondary distribution pipeline (5) at one end of the exhaust tee joint (3) far away from the valve short pipe (2);
the gas-filled sleeve structure (4) has a gas supply pipe (402) that can extend to the valve core of the valve (1);
the end part of the gas supply pipe (402) exposed to one end of the gas filling sleeve structure (4) is communicated with an external inert gas source device to receive inert gas delivered by the inert gas source;
The inert gas source delivers inert gas into the valve pipe stub (2) or the secondary distribution pipe (5) through the gas supply pipe (402);
the exhaust tee joint (3) is provided with a connecting pipe part (301) matched with the valve short pipe (2), the inflation sleeve structure (4) and the secondary distribution pipeline (5), and an exhaust pipe part (302) communicated with the side face of the exhaust tee joint (3);
the pipe diameter of an exhaust pipe part (302) of the exhaust tee joint (3) is the same as that of the air supply pipe (402);
the exhaust pipe part (302) of the exhaust tee joint (3) is sealed by a sealing cap (303);
the connecting pipe part (301) of the exhaust tee joint (3) close to one side of the valve short pipe (2) is butted with the valve short pipe (2) and fixedly connected with the valve short pipe in a positioning welding mode;
the connecting pipe part (301) of the exhaust tee joint (3) far away from one side of the valve short pipe (2) is connected with the inflation sleeve structure (4) or the secondary distribution pipeline (5);
the pipe diameter of the connecting pipe part (301) of the exhaust tee joint (3) is consistent with that of the valve short pipe (2) or the secondary distribution pipeline (5);
the inflatable sleeve structure (4) comprises:
a sleeve (401) which is matched with the connecting pipe part (301) of the exhaust tee joint (3); and
A cover plate (40102) formed at the end part of one end of the sleeve (401) far away from the exhaust tee (3);
the cover plate (40102) and the sleeve (401) are of an integral structure;
the lower end of the sleeve (401) is open;
the pipe diameter of the sleeve (401) is larger than that of the connecting pipe part (301) of the exhaust tee joint (3), and the difference between the pipe diameter of the sleeve (401) and the pipe diameter of the connecting pipe part (301) is 1-2 mm;
the pipe diameter of the sleeve (401) is larger than that of the secondary distribution pipeline (5), and the difference between the pipe diameter of the sleeve (401) and the pipe diameter of the secondary distribution pipeline (5) is 1-2 mm;
the sleeve (401) is sleeved on the connecting pipe part (301) or the secondary distribution pipeline (5);
the inflatable sleeve structure (4) further comprises:
the gas supply pipe (402);
a through hole (40101) is formed in the center of the cover plate (40102), and the gas supply pipe (402) penetrates through the through hole (40101) of the cover plate (40102) and extends to the valve core of the valve (1) or the secondary distribution pipeline (5);
the gas supply pipe (402) is provided with a ferrule connector assembly;
the ferrule connector assembly is divided into a fixed ferrule connector (403) integrated at the end of the gas supply pipe (402) far away from one end of the sleeve (401) and a movable ferrule connector (404) integrated at one end of the gas supply pipe (402) close to the sleeve (401);
The air supply pipe (402) is fixedly assembled with the cover plate (40102) through the movable clamping sleeve joint (404), the inner diameter of the movable clamping sleeve joint (404) is larger than the outer diameter of the air supply pipe (402), and the air supply pipe (402) slides in the movable clamping sleeve joint (404);
an external inert gas source device is connected with the gas supply pipe (402) through a hose and the fixed clamping sleeve joint (403);
the movable bayonet joint (404) comprises a first movable bayonet joint (40401) and a second movable bayonet joint (40402);
the second movable clamping sleeve joint (40402) is arranged close to the cover plate (40102), and the outer diameter of the second movable clamping sleeve joint (40402) is consistent with the inner diameter of the through hole (40101);
the cross-sectional dimension of the first movable bayonet joint (40401) is greater than the cross-sectional dimension of the second movable bayonet joint (40402);
the second movable clamping sleeve joint (40402) is embedded into the through hole (40101) to realize the assembly and fixation of the gas supply pipe (402) and the cover plate (40102);
the air supply pipe (402) is connected with a movable sealing plug (40403) in a sliding way;
the movable sealing plug (40403) is made of rubber or silica gel;
An embedded body is protruded downwards from one end of the movable sealing plug (40403) close to the movable clamping sleeve joint (404);
the insert body can be inserted into a space between the movable bayonet joint (404) and the air supply pipe (402) to limit sliding of the air supply pipe (402);
the movable sealing plug (40403) is in interference fit with the gas supply pipe (402);
the welding protection method of the inert gas protection device for the secondary stainless steel tube welding mainly comprises the following steps:
s101, measuring the distance from the end of the valve short pipe (2) to the valve core of the valve (1) by using a ruler, and measuring the distance between the two ends of the exhaust tee joint (3);
s102, aligning the exhaust tee joint (3) with the valve short pipe (2) and fixing the exhaust tee joint and the valve short pipe by positioning welding;
s103, sleeving a sleeve (401) of an air-filled sleeve structure (4) on a connecting pipe part (301) at the upper end of an exhaust tee joint (3), adjusting the position of an air supply pipe (402), ensuring that the end of the air supply pipe (402) is 5-10 mm away from a valve core of a valve (1), and fixing the position of the air supply pipe (402) by adopting a movable sealing plug (40403) and a movable clamping sleeve joint (404);
s104, connecting inert gas source equipment with a fixed clamping sleeve joint (403) at the upper end of a gas supply pipe (402) by using a hose;
S105, opening a valve of inert gas source equipment, and filling inert gas into the valve short pipe (2) and the exhaust tee joint (3) by using the gas supply pipe (402);
s106, detaching a sealing cap (303) on the exhaust pipe part (302), and welding the welding seam;
s107, after welding is finished, when the temperature of the welding seam is reduced to room temperature, a valve of inert gas source equipment is closed, and the inflating sleeve structure (4) is dismounted;
s108, aligning the exhaust tee joint (3) with the secondary distribution pipeline (5), and positioning, welding and fixing;
s109, sleeving the other end of the secondary distribution pipeline (5) on the inflation sleeve structure (4), adjusting the position of the air supply pipe (402), extending the air supply pipe (402) into the secondary distribution pipeline (5), and fixing the position of the air supply pipe (402) through the movable sealing plug (40403) and the movable clamping sleeve joint (404); opening an inert gas source equipment valve, filling inert gas into the secondary distribution pipeline (5) through a gas supply pipe (402), and welding a welding seam;
s110, after welding, when the temperature of the welding seam is reduced to room temperature, closing a valve of inert gas source equipment, detaching the inflation sleeve structure (4), and installing a sealing cap (303) on the exhaust pipe part (302).
2. The inert gas shield apparatus for secondary distribution stainless steel pipe welding as claimed in claim 1, wherein the fixing bayonet joint (403) is configured as a disk structure having a cross-sectional dimension larger than that of the gas supply pipe (402).
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| US4972577A (en) * | 1988-12-12 | 1990-11-27 | Dierikx Andreas P A | Method for manufacturing gate valves |
| CN102873462A (en) * | 2012-10-13 | 2013-01-16 | 南通国电电站阀门有限公司 | Process for welding swing check valve and matching pipe |
| CN205393849U (en) * | 2016-03-31 | 2016-07-27 | 中国能源建设集团黑龙江省火电第三工程有限公司 | A argon filling device for welded tube |
| CN106969165A (en) * | 2017-05-09 | 2017-07-21 | 新地能源工程技术有限公司 | The standard attachment structure of small-aperture ball valve, stop valve |
| CN206998012U (en) * | 2017-06-21 | 2018-02-13 | 杨海军 | A kind of aerating device of stainless steel pipes welding protection |
| CN214769605U (en) * | 2021-05-14 | 2021-11-19 | 北京世源希达工程技术有限公司 | Secondary is joined in marriage nonrust steel pipe welding inert gas protection device |
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