CN112059527A - Welding protection device and method for thin-walled tube - Google Patents
Welding protection device and method for thin-walled tube Download PDFInfo
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- CN112059527A CN112059527A CN202011060232.8A CN202011060232A CN112059527A CN 112059527 A CN112059527 A CN 112059527A CN 202011060232 A CN202011060232 A CN 202011060232A CN 112059527 A CN112059527 A CN 112059527A
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- walled tube
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0531—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor internal pipe alignment clamps
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a welding protection device for a thin-walled tube, which comprises: the first end of the fastening sleeve penetrates into the thin-wall pipe, the second end of the fastening sleeve clamps the second end of the thin-wall pipe, the outer wall of the fastening sleeve is matched with the inner wall of the thin-wall pipe, a first groove is formed in the inner wall of the fastening sleeve along the axial direction of the fastening sleeve, and the second end of the first groove is communicated with the air pipe; a second groove is formed in the outer wall of the fastening sleeve along the circumferential direction of the fastening sleeve; a plurality of through holes are uniformly distributed at the bottom end of the second groove and are communicated with the first groove and the second groove; the top cover is detachably connected with the first end of the fastening sleeve, the outer diameter of the top cover is larger than the inner diameter of the fastening sleeve, and the first groove is sealed. The thin-wall pipe welding device solves the problems of limited welding space and low welding efficiency of the thin-wall pipe, the thin-wall pipe is expanded through the fastening sleeve and the fastening pin, and the shielding gas is uniformly distributed into the second grooves directly through the first grooves, so that the welding deformation of the thin-wall pipe is prevented, the defect of limited welding space is overcome, and the welding efficiency is improved.
Description
Technical Field
The invention relates to the technical field of nuclear power thin-walled tube welding, in particular to a welding protection device and method for a thin-walled tube.
Background
In the fourth generation nuclear power new reactor type container and reactor internals manufacturing, the butt joint of thin-wall pipes and the butt welding seams of the thin-wall pipes and flanges are involved, and because the size of the pipes is small, back chipping cannot be carried out, backing welding needs to realize single-side welding and double-side forming.
In the prior art, in order to ensure the single-side welding and double-side forming of the thin-wall pipe, inert gas (such as Ar) is filled into the whole pipe inner wall, and U-shaped pulling horses or circular hoop equipment are adopted on the outer front surface to perform deformation prevention fixing on two sides of a welding line, so that the deformation prevention effect is achieved.
However, when the thickness of the pipe is less than or equal to 10mm, the periphery of the fillet weld of the puller and the test plate deforms, so that the straightness of the pipe is affected, the external anti-deformation device occupies a large space, and for a novel small stack type, the welding space is possibly limited by the front tool, and at the moment, only a part of weld can be welded firstly, then the anti-deformation tool is detached and then another part of weld is welded.
Such operations can increase the degree of local deformation, consume large amounts of inert gas, increase the number of welded joints, affect the quality of the product, and reduce the efficiency of the welding. Moreover, the tool disassembly process may result in leakage of shielding gas and even air entrainment.
Disclosure of Invention
The invention aims to provide a welding protection device and a welding protection method for a thin-walled tube. The device and the method aim to solve the problems of limited welding space and low welding efficiency of the traditional thin-walled tube welding tool, the thin-walled tube is expanded through the fastening sleeve and the fastening pin, the first groove, the second groove and the through holes which are uniformly distributed are arranged, so that shielding gas is directly uniformly distributed into the second groove through the first groove, the welding deformation of the thin-walled tube is prevented, the defect of limited welding space is overcome, and the welding efficiency is improved.
In order to achieve the aim, the invention provides a welding protection device for a thin-walled tube, which comprises a fastening sleeve, a first groove, a second groove, a plurality of through holes and a top cover; the first end of the fastening sleeve penetrates into the thin-wall pipe, the second end of the fastening sleeve clamps the second end of the thin-wall pipe, and the outer wall of the fastening sleeve is matched with the inner wall of the thin-wall pipe; a first groove is formed in the inner wall of the fastening sleeve along the axial direction of the fastening sleeve, and the second end of the first groove is communicated with an external air pipe; a second groove is formed in the outer wall of the fastening sleeve along the circumferential direction of the fastening sleeve; a plurality of through holes are uniformly distributed at the bottom end of the second groove and are used for communicating the first groove with the second groove; the top cover is detachably connected with the first end of the fastening sleeve, and the outer diameter of the top cover is larger than the inner diameter of the fastening sleeve and used for sealing the first groove on the inner wall of the fastening sleeve;
the outside air pipe leads the protective gas into a first groove of the fastening sleeve, and under the action of the air pressure in the first groove, the protective gas is uniformly led into a second groove on the outer wall of the fastening sleeve through a plurality of through holes to form uniform protective air flow, the back weld between the thin-wall pipe and the fastening sleeve is filled, and protective atmosphere is created at the back weld of the thin-wall pipe; in the welding process, the uniform protective gas flow of the welding seam on the back of the thin-walled tube can protect molten liquid metal from reacting with gas with oxidizing property in the air to influence the welding seam forming and performance of the welding seam on the back of the thin-walled tube, and the welding protection of the welding seam on the back of the thin-walled tube is completed.
Most preferably, the welding protection device further comprises a fastening pin detachably arranged at the second end of the fastening sleeve and used for abutting against and expanding the fastening sleeve and the thin-walled tube so as to ensure the straightness of the thin-walled tube in the welding process, prevent the thin-walled tube from generating welding deformation and complete the welding deformation protection of the thin-walled tube.
Most preferably, the welding protection device further comprises a screw, a first end of which is sequentially penetrated by the fastening pin and the fastening sleeve for fixing the fastening pin and the fastening sleeve.
Most preferably, the cap is disposed at the first end of the screw, and detachably connected to the first end of the fastening sleeve for sealing the first groove on the inner wall of the fastening sleeve.
Most preferably, the welding protection device further comprises a fixing piece, wherein the fixing piece is arranged at the second end of the screw rod and used for fixing the screw rod after the first end of the screw rod sequentially penetrates through the fastening pin and the fastening sleeve; the fixing member includes a nut and a washer.
Most preferably, the fastening sleeve further comprises:
the first end of the cylindrical sleeve penetrates into the thin-wall pipe and is detachably connected with the top cover; the outer wall of the cylindrical sleeve is matched with the inner wall of the thin-walled tube;
and the disc sleeve is coaxially connected with the second end of the cylindrical sleeve, has the outer diameter size larger than the inner diameter size of the thin-wall pipe and is used for clamping the second end of the thin-wall pipe.
Most preferably, the top cover is provided with a bulge; the first end of the fastening sleeve is provided with an assembling groove; the bulge is connected with the first end of the fastening sleeve in a matching way through the assembling groove.
Most preferably, the top cover is further provided with a plurality of symmetrically distributed air outlets which are communicated with the second groove and used for discharging the shielding gas in the second groove out of the back welding line, so that the excessive air pressure in the welding protection device is prevented.
Most preferably, the second end of the first groove is communicated with an external air pipe through an air inlet pipe, and is used for introducing protective air in the external air pipe into the first groove through the air inlet pipe.
The invention also provides a welding protection device and method for the thin-walled tube, the welding protection method is realized based on the welding protection device for the thin-walled tube, and the welding protection method comprises the following steps:
step 1: the first end of the fastening sleeve penetrates into the thin-walled tube to be welded, the second end of the fastening sleeve clamps the second end of the thin-walled tube, the thin-walled tube to be welded is fixed, the thin-walled tube is guaranteed to be expanded when being heated in the welding process, the fastening sleeve and the first end of the fastening pin are abutted and expanded, the straightness of the thin-walled tube in the welding process is guaranteed, the thin-walled tube cannot be welded and deformed, and welding deformation protection of the thin-walled tube is completed;
step 2: sequentially penetrating a fastening pin and a fastening sleeve at the first end of the screw rod, fixing a top cover at the first end of the fastening sleeve, and sealing the first groove;
and step 3: welding the thin-walled tube, and introducing protective gas in an external gas tube into the first groove through the gas inlet tube;
and 4, step 4: the protective gas in the first groove enters the second groove through the plurality of through holes under the action of air pressure to form uniform protective gas flow, the back weld joint of the thin-walled tube is uniformly filled with the protective gas flow, protective atmosphere is created in the back weld joint of the thin-walled tube, and the protective gas flow protects the back weld joint from reacting with gas with oxidability in the welding process to influence the weld joint forming of the back weld joint of the thin-walled tube, so that the welding protection of the back weld joint of the thin-walled tube is completed.
By applying the thin-walled tube welding tool, the problems of limited welding space and low welding efficiency of the traditional thin-walled tube welding tool are solved, the thin-walled tube is expanded through the fastening sleeve and the fastening pin, and the first groove, the second groove and the uniformly distributed through holes are arranged, so that shielding gas is directly uniformly distributed into the second groove through the first groove, the welding deformation of the thin-walled tube is prevented, the defect of limited welding space is overcome, and the welding efficiency is improved.
Compared with the prior art, the invention has the following beneficial effects:
1. the welding protection device provided by the invention is provided with the fastening sleeve with the first groove, the second groove and the through holes which are uniformly distributed, and the shielding gas of the external air pipe is directly and uniformly introduced between the back welding seams of the thin-walled pipe, so that the welding protection device plays a role of protection when one-side welding and double-side forming backing welding are carried out, and the welding efficiency is improved.
2. The welding protection device provided by the invention is provided with the fastening pin, and the fastening pin is used for propping against and expanding the thin-wall pipe in the welding process of the thin-wall pipe, so that the thin-wall pipe is prevented from welding deformation.
3. The welding protection device provided by the invention is provided with the first groove and the vent pipe, so that the first groove and the vent pipe are conveniently and directly communicated with an external air pipe, welding installation is not influenced, the defect that the traditional welding space is limited is overcome, and the welding efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of a welding protection device according to the present invention;
FIG. 2 is a schematic cross-sectional view of a fastening sleeve provided in accordance with the present invention;
fig. 3 is a schematic side sectional structure view of the fastening sleeve provided by the present invention.
Detailed Description
The invention will be further described by the following specific examples in conjunction with the drawings, which are provided for illustration only and are not intended to limit the scope of the invention.
The invention relates to a welding protection device for a thin-walled tube 1, which comprises a fastening sleeve 2, a top cover 3, a fastening pin 4, a screw rod 5, a fixing piece 6 and an air inlet tube 7, wherein the fastening sleeve is arranged on the top cover 3; in this embodiment, the material of the welding protection device is selected from one or more of carbon steel, low alloy steel, and stainless steel.
As shown in fig. 1, a first end of a fastening sleeve 2 penetrates through a first end of a thin-walled tube 1 to be welded and enters the thin-walled tube 1, and a second end clamps a second end of the thin-walled tube 1; and the outer wall of the fastening sleeve 2 is matched with the inner wall of the thin-walled tube 1.
As shown in fig. 2 and 3, a first groove 201 is formed on the inner wall of the fastening sleeve 2 along the axial direction thereof, and a second end of the first groove 201 is communicated with an external air tube K; a second groove 202 is formed in the outer wall of the fastening sleeve 2 along the circumferential direction; the bottom end of the second groove 202 is uniformly distributed with a plurality of through holes 203 for communicating the first groove 201 and the second groove 202.
The small and uniform through holes 203 can ensure the uniformity of the protective gas flow, ensure the smooth protective gas and simultaneously avoid influencing a molten pool at the center of a welding seam on the back of the thin-walled tube 1; in this embodiment, the number of the through holes 203 is 10-20, and the diameter of the through holes 203 is 1-2 mm.
As shown in fig. 1, the cap 3 is detachably connected to the first end of the fastening sleeve 2, and the outer diameter of the cap 3 is larger than the inner diameter of the fastening sleeve 2 for sealing the first groove 201 on the inner wall of the fastening sleeve 2.
The outside air pipe K leads the protective air into the first groove 201 of the fastening sleeve 2 to play a role in buffering the protective air, under the action of the air pressure in the first groove 201, the protective air is uniformly led into the second groove 202 on the outer wall of the fastening sleeve 2 through a plurality of through holes 203 communicated with the first groove 201 to form uniform protective air flow, the back weld seam between the thin-wall pipe 1 and the fastening sleeve 2 is filled, and the protective atmosphere is created on the back weld seam of the thin-wall pipe 1; in the welding process, a liquid metal area formed by metal melting is sensitive to the flowing strength of gas, and the uniform protective gas flow of the welding seam on the back of the thin-walled tube 1 can protect the molten liquid metal from reacting with oxygen in the air or other gases with oxidability to form an oxidation film, so that the welding seam forming and performance of the welding seam on the back of the thin-walled tube 1 are influenced, and the welding protection of the welding seam on the back of the thin-walled tube 1 is completed.
In this embodiment, the protective gas introduced into the external gas pipe K is argon.
As shown in fig. 2 and 3, the fastening sleeve 2 further includes a cylindrical sleeve 204 and a circular disk sleeve 205; the first end of the cylindrical sleeve 204 penetrates through the first end of the thin-walled tube 1 and is detachably connected with the top cover 3; the outer wall of the cylindrical sleeve 204 is matched with the inner wall of the thin-walled tube 1; the disc sleeve 205 is coaxially connected with the second end of the cylindrical sleeve 204; the outer diameter of the disc sleeve 205 is larger than the inner diameter of the thin-walled tube 1, and the disc sleeve is used for clamping the second end of the thin-walled tube 1; a first end of the cylindrical sleeve 204 of the fastening sleeve 2 is provided with a fitting groove 206.
The fastening sleeve 2 is formed by assembling four pieces of tooling, the outer diameter of one of the four pieces of the disc sleeve 205 is smaller than the inner diameter of the cylindrical sleeve 204, so that the whole fastening sleeve 2 can be conveniently pushed to the pipe diameter center of the thin-walled pipe 1 to be welded to be fastened and loosened, and then the fastening sleeve 2 is taken out to be convenient for assembly and installation. In the embodiment, the total length of the fastening sleeve 2 is 60-80 mm, the outer diameter of the disc sleeve 205 is 60-100 mm, and the outer diameter of the cylindrical sleeve 204 is 40-50 mm; the inner diameter of the fastening sleeve 2 is 15-18 mm.
As shown in fig. 1, the welding protection device further includes a fastening pin 4 detachably disposed on the disc sleeve 205 at the second end of the fastening sleeve 2, and configured to abut against and expand the fastening sleeve 2 and the thin-walled tube 1, so as to ensure straightness of the thin-walled tube 1 during welding, prevent the thin-walled tube 1 from welding deformation, and complete welding deformation protection of the thin-walled tube 1; the outer wall of the fastening pin 4 is designed to have a certain inclination in the assembling and welding process, and the inclination of the outer wall is 2-5 degrees in the embodiment.
The welding protection device also comprises a screw rod 5; the first end of the screw 5 is sequentially inserted through the fastening pin 4 and the disc sleeve 205 and the cylindrical sleeve 204 of the fastening sleeve 2, for fixing the fastening pin 4 and the fastening sleeve 2.
The top cover 3 is arranged at the first end of the screw rod 4 and detachably connected with the first end of the cylindrical sleeve 204 of the fastening sleeve 2 for sealing the first groove 201 on the inner wall of the fastening sleeve 2.
The welding protection device also comprises a fixing piece 6 which is arranged at the second end of the screw rod 4 and is used for fixing the screw rod 4 after the first end of the screw rod 4 is sequentially penetrated and arranged with the fastening pin 4, the disc sleeve 205 and the cylindrical sleeve 204 of the fastening sleeve 2; in the present embodiment, the fixing member 6 includes a nut and a washer.
The top cover 3 is provided with a bulge 301; the bulge 301 is matched and connected with the first end of the fastening sleeve 2 through the assembling groove 206 on the cylindrical sleeve 204; the top cover 3 is also provided with a plurality of symmetrically distributed air outlet holes 302 which are communicated with the second groove 202 and used for discharging the shielding gas in the second groove 202 out of the back welding seam so as to prevent the air pressure in the welding protection device from being too large; in this embodiment, the number of the plurality of air outlet holes 302 is 2 or 4.
The second end of the first groove 202 inside the fastening sleeve 2 is communicated with the external trachea K through the air inlet pipe 7, and is used for leading protective gas in the external trachea K into the first groove 202 through the air inlet pipe 7.
The invention also provides a welding protection device method for the thin-walled tube 1, which is realized based on the welding protection device for the thin-walled tube 1, and comprises the following steps:
step 1: the first end of a cylindrical sleeve 204 in a fastening sleeve 2 penetrates through the first end of a thin-walled tube 1 to be welded and enters the thin-walled tube 1, a disc sleeve 205 at the second end of the fastening sleeve 2 clamps the second end of the thin-walled tube 1, and the thin-walled tube 1 to be welded is fixed, so that the thin-walled tube 1 is heated and expanded in the welding process, abuts against and expands the disc sleeve 205 of the fastening sleeve 2 and the first end of a fastening pin 4, the straightness of the thin-walled tube 1 in the welding process is guaranteed, the thin-walled tube 1 cannot be welded and deformed, and welding deformation protection of the thin-walled tube 1 is completed;
step 2: a first end of a screw rod 5 is sequentially penetrated through a fastening pin 4, a disc sleeve 205 and a cylindrical sleeve 204 of a fastening sleeve 2, and a top cover 3 is fixed at the first end of the disc sleeve 204 in the fastening sleeve 2 so as to seal the first end of a first groove 201 in the fastening sleeve 2;
and step 3: welding the thin-walled tube 1, and introducing shielding gas in an external gas tube K into the first groove 201 in the fastening sleeve 2 through the gas inlet tube 7 to buffer the shielding gas;
and 4, step 4: the shielding gas in the first groove 201 enters the second groove 202 on the outer wall of the fastening sleeve 2 through the plurality of through holes 203 communicated with the first groove 201 under the action of air pressure to form uniform shielding gas flow, the back weld seams of the thin-walled tube 1 are uniformly filled, a shielding atmosphere is created in the back weld seams of the thin-walled tube 1, the uniform shielding gas flow protects the back weld seams of the thin-walled tube 1 from reacting with gas with oxidability in the welding process, the weld seam forming and performance of the back weld seams of the thin-walled tube 1 are affected, and the welding protection of the back weld seams of the thin-walled tube 1 is completed.
The working principle of the invention is as follows:
the first end of a cylindrical sleeve in a fastening sleeve penetrates through the first end of a thin-walled tube to be welded and enters the thin-walled tube, a disc sleeve at the second end of the fastening sleeve clamps the second end of the thin-walled tube, and the thin-walled tube to be welded is fixed, so that the thin-walled tube is heated to expand in the welding process and abuts against and expands the fastening sleeve and a fastening pin, the straightness of the thin-walled tube in the welding process is ensured, the thin-walled tube cannot be welded and deformed, and the welding deformation protection of the thin-walled tube is completed; sequentially penetrating a first end of the screw rod through a fastening pin and a fastening sleeve, and fixing a top cover at the first end of the fastening sleeve to seal the first end of a first groove in the fastening sleeve; welding the thin-walled tube, and introducing shielding gas in an external gas tube into the first groove in the fastening sleeve through the gas inlet tube to buffer the shielding gas; the protective gas in the first groove enters the second groove through the plurality of through holes communicated with the first groove under the action of air pressure to form uniform protective gas flow, the back weld joint of the thin-walled tube is uniformly filled, protective atmosphere is created in the back weld joint of the thin-walled tube, and the protective gas flow protects the back weld joint of the thin-walled tube from reacting with gas with oxidability in the welding process to influence the weld joint forming and performance of the back weld joint of the thin-walled tube, so that the welding protection of the back weld joint of the thin-walled tube is completed.
In conclusion, the welding protection device and the welding protection method for the thin-walled tube solve the problems of limited welding space and low welding efficiency of the traditional thin-walled tube welding tool, expand the thin-walled tube through the fastening sleeve and the fastening pin, and are provided with the first groove, the second groove and the uniformly distributed through holes, so that the shielding gas is directly and uniformly distributed into the second groove through the first groove, the welding deformation of the thin-walled tube is prevented, the defect of limited welding space is overcome, and the welding efficiency is improved.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A weld protector for thin walled tubes comprising:
the first end of the fastening sleeve penetrates into the thin-wall pipe, the second end of the fastening sleeve clamps the second end of the thin-wall pipe, and the outer wall of the fastening sleeve is matched with the inner wall of the thin-wall pipe;
a first groove is formed in the inner wall of the fastening sleeve along the axial direction of the fastening sleeve, and the second end of the first groove is communicated with an external air pipe;
a second groove is formed in the outer wall of the fastening sleeve along the circumferential direction of the fastening sleeve; a plurality of through holes are uniformly distributed at the bottom end of the second groove and are used for communicating the first groove with the second groove;
the top cover is detachably connected with the first end of the fastening sleeve, the outer diameter of the top cover is larger than the inner diameter of the fastening sleeve, and the top cover is used for sealing the first groove on the inner wall of the fastening sleeve; the outside air pipe leads the protective gas into the first groove of the fastening sleeve, and under the action of the air pressure in the first groove, the protective gas is uniformly led into the second groove on the outer wall of the fastening sleeve through the plurality of through holes to form uniform protective air flow, so that the back weld seam between the thin-walled pipe and the fastening sleeve is filled, and a protective atmosphere is created at the back weld seam of the thin-walled pipe; in the welding process, the uniform protective gas flow of the welding seam on the back of the thin-walled tube can protect molten liquid metal from reacting with gas with oxidizing property in the air to influence the welding seam forming and performance of the welding seam on the back of the thin-walled tube, and the welding protection of the welding seam on the back of the thin-walled tube is completed.
2. The welding protection device for the thin-walled tube according to claim 1, further comprising a fastening pin detachably disposed at the second end of the fastening sleeve for abutting against and expanding the fastening sleeve and the thin-walled tube to ensure straightness of the thin-walled tube during welding, prevent the thin-walled tube from welding deformation, and complete welding deformation protection of the thin-walled tube.
3. The welding protector for thin walled tubes of claim 2, further comprising a threaded rod having a first end passing through the fastening pin and the fastening sleeve in sequence for securing the fastening pin and the fastening sleeve.
4. A weld protector for thin walled tubes as claimed in claim 3 wherein the cap is provided at the first end of the screw for removable connection with the first end of the fastening sleeve for sealing the first groove in the inner wall of the fastening sleeve.
5. The welding protection device for the thin-walled tube according to claim 3, further comprising a fixing member disposed at the second end of the screw rod for fixing the screw rod after the first end of the screw rod is sequentially inserted through the fastening pin and the fastening sleeve; the fixing member includes a nut and a washer.
6. The weld protection device for thin walled tubes of claim 1, wherein the fastening sleeve further comprises:
the first end of the cylindrical sleeve penetrates into the thin-wall pipe and is detachably connected with the top cover; the outer wall of the cylindrical sleeve is matched with the inner wall of the thin-walled tube;
and the disc sleeve is coaxially connected with the second end of the cylindrical sleeve, has an outer diameter larger than the inner diameter of the thin-walled tube and is used for clamping the second end of the thin-walled tube.
7. The weld protection device for thin walled tubes of claim 1, wherein the top cap is provided with a projection; the first end of the fastening sleeve is provided with an assembling groove; the bulge is connected with the first end of the fastening sleeve in a matching mode through the assembling groove.
8. The welding protector for thin-walled tubes according to claim 1, wherein the top cap further comprises a plurality of symmetrically distributed vent holes, the vent holes are communicated with the second groove and used for exhausting shielding gas in the second groove to the back weld joint, and the gas pressure inside the welding protector is prevented from being too high.
9. The welding protection device for the thin-walled tube according to claim 1, wherein the second end of the first groove is communicated with an external air tube through an air inlet tube, and is used for introducing shielding gas in the external air tube into the first groove through the air inlet tube.
10. A method of a welding protection device for a thin-walled tube, characterized in that the welding protection method is realized based on the welding protection device for the thin-walled tube according to any one of claims 1 to 9, and the welding protection method comprises the following steps:
step 1: penetrating a first end of a fastening sleeve into the thin-walled tube to be welded, clamping a second end of the fastening sleeve at the second end of the thin-walled tube, fixing the thin-walled tube to be welded, ensuring that the thin-walled tube is abutted against and expands the fastening sleeve and the first end of a fastening pin, and ensuring that the thin-walled tube is not subjected to welding deformation so as to complete welding deformation protection of the thin-walled tube;
step 2: sequentially penetrating a first end of the screw rod through the fastening pin and the fastening sleeve, fixing the top cover at the first end of the fastening sleeve, and sealing the first groove;
and step 3: welding the thin-walled tube, and introducing shielding gas in an external gas tube into the first groove through the gas inlet tube;
and 4, step 4: the protective gas in the first groove enters the second groove through the plurality of through holes under the action of air pressure to form uniform protective gas flow, the back welding seams of the thin-walled tube are uniformly filled with the protective gas flow, protective atmosphere is created in the back welding seams of the thin-walled tube, and the protective gas flow protects the back welding seams from reacting with gas with oxidizability in the welding process to influence the welding seam forming of the back welding seams of the thin-walled tube so as to complete the welding protection of the back welding seams of the thin-walled tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011060232.8A CN112059527A (en) | 2020-09-30 | 2020-09-30 | Welding protection device and method for thin-walled tube |
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| CN202011060232.8A CN112059527A (en) | 2020-09-30 | 2020-09-30 | Welding protection device and method for thin-walled tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113478077A (en) * | 2021-07-05 | 2021-10-08 | 铭镭激光智能装备（河源）有限公司 | Laser welding apparatus |
| CN114713949A (en) * | 2022-03-23 | 2022-07-08 | 西安菲尔特金属过滤材料股份有限公司 | Be used for metal mesh belt automatic weld back gas protection device |
| CN114986130A (en) * | 2022-05-23 | 2022-09-02 | 上海电气核电设备有限公司 | Back gas protection method for butt welding of thin-walled tube and large-chamber container tube joint |
-
2020
- 2020-09-30 CN CN202011060232.8A patent/CN112059527A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113478077A (en) * | 2021-07-05 | 2021-10-08 | 铭镭激光智能装备（河源）有限公司 | Laser welding apparatus |
| CN113478077B (en) * | 2021-07-05 | 2023-08-18 | 铭镭激光智能装备（河源）有限公司 | Laser welding equipment |
| CN114713949A (en) * | 2022-03-23 | 2022-07-08 | 西安菲尔特金属过滤材料股份有限公司 | Be used for metal mesh belt automatic weld back gas protection device |
| CN114713949B (en) * | 2022-03-23 | 2024-05-28 | 西安菲尔特金属过滤材料股份有限公司 | Automatic welding back gas protection device for metal mesh belt |
| CN114986130A (en) * | 2022-05-23 | 2022-09-02 | 上海电气核电设备有限公司 | Back gas protection method for butt welding of thin-walled tube and large-chamber container tube joint |
| CN114986130B (en) * | 2022-05-23 | 2024-02-02 | 上海电气核电设备有限公司 | Back gas protection method for butt welding of thin-wall pipe and large-cavity container pipe joint |
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