CN114734118B - Micro-area strong drainage tungsten electrode TIG welding torch for underwater local dry operation - Google Patents
Micro-area strong drainage tungsten electrode TIG welding torch for underwater local dry operation Download PDFInfo
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- CN114734118B CN114734118B CN202210174295.9A CN202210174295A CN114734118B CN 114734118 B CN114734118 B CN 114734118B CN 202210174295 A CN202210174295 A CN 202210174295A CN 114734118 B CN114734118 B CN 114734118B
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- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 157
- 239000010937 tungsten Substances 0.000 title claims abstract description 157
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 238000003466 welding Methods 0.000 title claims abstract description 150
- 206010039897 Sedation Diseases 0.000 claims abstract description 24
- 230000036280 sedation Effects 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 230000002936 tranquilizing effect Effects 0.000 claims abstract description 6
- 239000004020 conductor Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000001681 protective effect Effects 0.000 claims description 9
- 210000000078 claw Anatomy 0.000 claims description 7
- 230000001624 sedative effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims 30
- 239000011261 inert gas Substances 0.000 claims 2
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 10
- 239000011810 insulating material Substances 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000932 sedative agent Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003657 tungsten Chemical class 0.000 description 1
Classifications
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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
- B23K9/0061—Underwater arc welding
-
- 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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K9/32—Accessories
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention provides a micro-area strong drainage tungsten electrode TIG welding torch for underwater local dry operation, which comprises an electrode connecting device, a gas sedation device, a gas hood and a tungsten electrode; the gas sedation device is arranged below the electrode connection device; the gas hood is arranged below the gas sedation device; the electrode connecting device, the gas tranquilizing device and the gas hood are all in sealing connection; the electrode connecting device, the gas tranquilizing device and the gas hood jointly form a semi-closed hood body; the tungsten electrode is positioned in the semi-closed cover body; the tungsten electrode is fixed on the electrode connecting device and is mechanically and electrically connected with an external cable through the electrode connecting device; the opening of the semi-closed cover body is positioned on the air cover; the gas sedation device is connected with an external gas supply device. The welding torch is simple and compact in structure, low in cost, has a drainage function, can provide a relatively dry welding area, and meets welding requirements in a narrow welding space.
Description
Technical Field
The invention relates to the technical field of underwater local dry welding, in particular to a micro-area strong drainage tungsten electrode TIG welding torch for underwater local dry operation.
Background
The nuclear power development is in the beginning of important strategic opportunities, and has wider development space, nuclear power equipment is in huge manufacturing/remanufacturing demands, and particularly the underwater welding manufacturing technology of a reactor pool has huge application space.
The underwater welding is mainly divided into underwater dry welding, underwater wet welding and underwater local dry welding. The underwater wet welding is directly performed in water, the strong cooling effect of the water on the electric arc can aggravate the electric arc shrinkage, the welding process needs higher energy, meanwhile, the strength of a welding joint is difficult to ensure in a welding area due to the quenching effect of the water, and the welding material and the welding process have higher requirements; the underwater dry welding is to completely isolate the to-be-welded area from water by using a special container, so that the equipment is huge, the cost is high, and the operation efficiency is extremely low; the underwater local dry welding adopts a small drainage device to drain and weld the water in the local area to be welded, so that the advantages of simplicity in wet operation and low cost are integrated, and the electric arc protection effect of the dry method is achieved.
At present, a nuclear power station generally needs to be subjected to refueling overhaul at intervals, and during the period, the locating pin of the fuel assembly of the upper reactor internals needs to be checked, and if the locating pin is found to be bent and deformed or cracked and cannot be used normally, the locating pin needs to be replaced under water environment. After the locating pin is arranged in the locating hole of the upper reactor core plate, the locating pin is fixed on the reactor core plate through threaded connection by adopting a locknut, and the locating pin and the reactor core plate are welded at the matched threads so as to meet the locking requirement. Because of the large number of locating pins mounted on the upper reactor core plate, high requirements are placed on torch dimensions (e.g., height less than or equal to 80mm, profile diameter less than or equal to 31mm, etc.) to avoid interference during underwater welding manufacturing. Meanwhile, in order to ensure the welding quality and improve the underwater welding efficiency, the welding torch needs to be capable of completing two forming welding at the same position, and therefore higher requirements are provided for the structure of the welding torch with small size.
Disclosure of Invention
In order to overcome the defects and the shortcomings in the prior art, the invention aims to provide a micro-area strong drainage tungsten electrode TIG welding torch for underwater local dry operation. The welding torch is simple and compact in structure, low in cost, has a drainage function, can provide a relatively dry welding area, and meets welding requirements in a narrow welding space.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a micro-area strong drainage tungsten electrode TIG welding torch for local dry operation under water is characterized in that: comprises an electrode connecting device, a gas sedating device, a gas hood and more than one tungsten electrode; the gas sedation device is arranged below the electrode connection device; the gas hood is arranged below the gas sedation device; the electrode connecting device, the gas tranquilizing device and the gas hood are all in sealing connection; the electrode connecting device, the gas tranquilizing device and the gas hood jointly form a semi-closed hood body; the tungsten electrode is positioned in the semi-closed cover body; the tungsten electrode is fixed on the electrode connecting device and is mechanically and electrically connected with an external cable through the electrode connecting device; the opening of the semi-closed cover body is positioned on the air cover; the gas sedating device is connected with the external air supply device so as to realize that the protective gas provided by the external air supply device is conveyed into the gas hood through the gas sedating device, and the pressure difference between the inside and the outside of the gas hood is formed to prevent water from entering the semi-closed hood body.
The welding torch is externally connected with the cable through the electrode connecting device, so that a power supply is provided for the welding torch; the external air supply device is used for providing protective air for the welding torch; before welding starts, protective gas is firstly conveyed in advance, and liquid in the welding torch is discharged completely; and then welding is carried out, wherein the water is continuously discharged by the protective gas in the welding torch in the welding process, and the water is prevented from entering the welding torch again under the condition that the internal and external pressure difference is positive, so that the underwater welding is realized.
The welding torch has the advantages of simple and compact structure and low cost, and can meet the welding requirement in a narrow welding space; the welding device is particularly suitable for a locating pin area of a reactor core plate on a nuclear power station, and is used for carrying out loosening welding on the locating pin and the nut; and in addition, the method can also be applied to other welding occasions. The external parts are all insulating materials, so that insulation protection can be effectively realized, and the reliability and safety of welding operation of the welding torch under water are improved.
Preferably, a tungsten electrode fixing sleeve is arranged outside the tungsten electrode; the upper end of the tungsten electrode fixing sleeve is fixed on the electrode connecting device, and the lower end of the tungsten electrode fixing sleeve extends out of the gas sedation device into the gas hood; the tungsten electrode fixing sleeve is in interference fit with the gas sedan.
Preferably, the tungsten electrode fixing sleeve is a tungsten electrode clamping device; the tungsten electrode clamping device comprises a conductive tungsten electrode clamp and a conductive tungsten electrode clamp outer sleeve; the tungsten electrode clamp is in a shaft shape; the tungsten electrode clamp is provided with a clamp inner blind hole with a downward orifice; the bottom of the tungsten electrode clamp is provided with a claw; one end of the tungsten electrode is arranged in the blind hole in the clamp, and the other end extends out of the clamping jaw; the tungsten electrode clamp is sleeved with a sleeved hole; the sleeved hole is matched with the outer part of the tungsten electrode clamp, the lower end of the sleeved hole is a conical hole, and the wall of the conical hole is contacted with a claw at the bottom of the tungsten electrode clamp so as to lock the tungsten electrode by the tungsten electrode clamp; the tungsten electrode is electrically connected with the electrode connecting device through the tungsten electrode clamp and the tungsten electrode clamp jacket. The structure can flexibly adjust the extension length of the tungsten electrode, and has wider welding adaptability.
Preferably, the tungsten electrode clamp is in a stepped shaft shape with a small upper part and a large lower part, and the sleeve hole of the tungsten electrode clamp sleeve is in a stepped hole shape with a small upper part and a large lower part, so that the mutual limit of the tungsten electrode clamp and the tungsten electrode clamp sleeve is realized.
Preferably, the electrode connecting device comprises an electrode seat and a waterproof nut; the electrode seat is provided with a mounting through hole; the waterproof nut is provided with a threaded blind hole; the upper end of the tungsten electrode clamp protrudes out of the tungsten electrode clamp sleeve and is in threaded connection with the waterproof nut; the tungsten electrode clamping device is matched with the mounting through hole of the electrode seat; the joint of the waterproof nut and the electrode seat is sealed.
The extension length of the tungsten electrode from the tungsten electrode clamp can be flexibly adjusted, and various requirements of welding operation can be met. The height of the tungsten electrode clamp can be adjusted by screwing the waterproof nut, and the gap of the claw at the lower end of the tungsten electrode clamp is gradually reduced along with the continuous upward movement of the tungsten electrode clamp, and the tungsten electrode is locked by fixing the lower end conical hole of the outer sleeve of the tungsten electrode clamp; the tungsten electrode clamp and the tungsten electrode clamp jacket are mutually limited, so that the position of the tungsten electrode is not changed in the welding process, the stability and the reliability of the tungsten electrode in the welding operation are improved, the arc length is consistent, and the welding quality is ensured.
Preferably, the electrode holder comprises an electrode holder body with a containing cavity, an electrode holder cover and an electric conductor; the electric conductor is arranged in the accommodating cavity of the electrode seat body, and the electrode seat cover is arranged above the accommodating cavity of the electrode seat body; the outer part of the electrode seat body is provided with a cable connector for connecting an external cable; the conductor is connected with the cable joint; the mounting through hole comprises a first through hole formed in the electrode seat cover, a second through hole formed in the conductor and a third through hole formed in the electrode seat body; the tungsten electrode clamp is matched with the first through hole; the tungsten electrode clamp sleeve is contacted and matched with the through hole in two phases so as to realize electric connection with the electric conductor; the tungsten electrode clamp sleeve is also matched with the through hole III.
Preferably, the accommodating cavity of the electrode seat body is provided with an installing groove; the conductor is arranged in the mounting groove to realize positioning and fixing.
Preferably, the gas sedation device is provided with an air pipe joint for connecting with an external air supply device; the gas sedan is provided with a gas calm chamber; the gas ballast chamber is communicated with the air pipe joint; a plurality of micro air supply through holes are distributed on the chamber wall between the gas quiet chamber and the gas hood so as to realize the communication between the gas quiet chamber and the gas hood.
The gas sedan provided by the invention has the advantages that the protective gas is introduced into the gas sedan in the underwater welding operation process, is uniformly distributed in the gas sedan, and discharges water downwards through the micro gas-feed through holes under the action of pressure when the pressure in the gas sedan reaches a certain strength, and ensures that the interior of the welding torch is relatively dry in the underwater welding operation process, so that the adverse effect of the water environment on the welding seam forming quality is reduced; while also providing gas shielding during the welding process. The structure can effectively improve the drainage efficiency of the welding torch, and improve the welding efficiency while guaranteeing the welding quality.
Preferably, a through hole IV is further formed in the chamber wall between the gas ballast chamber and the gas hood, and the tungsten electrode fixing sleeve is matched with the through hole IV.
Preferably, the tungsten electrode is more than two; all tungsten electrodes are arranged in the same direction. The welding torch can realize single-point position and multi-point position welding only by one-time positioning; when the multi-point welding is performed, the welding can be performed simultaneously, and the welding efficiency can be improved while the welding quality is ensured.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the welding torch has the advantages of simple and compact structure and low cost, and can meet the welding requirement in a narrow welding space; the welding device is particularly suitable for a locating pin area of a reactor core plate on a nuclear power station, and is used for carrying out loosening welding on the locating pin and the nut; in addition, the method can also be applied to other welding occasions;
2. the welding torch can flexibly adjust the extension length of the tungsten electrode, and has wide welding adaptability;
3. the welding torch is provided with the gas ballast chamber for promoting the uniform distribution of the shielding gas, so that the drainage efficiency in the gas hood can be improved;
4. the external parts of the welding torch are all made of insulating materials, so that insulation protection can be effectively realized, and the reliability and safety of the welding torch in underwater welding operation are improved;
5. the setting of the multiple tungsten electrodes ensures that the welding torch can realize single-point and multi-point welding only by one-time positioning; when the multi-point welding is performed, the welding can be performed simultaneously, and the welding efficiency can be improved while the welding quality is ensured.
Drawings
FIG. 1 is a schematic view of the structure of a welding torch of the present invention;
FIG. 2 is a schematic cross-sectional view of the welding torch of the present invention;
FIG. 3 is a schematic view of the structure of an electrode connection device in the welding torch of the present invention;
FIG. 4 is a schematic view of the structure of the electrode holder body of the welding torch according to the present invention;
FIG. 5 is a schematic cross-sectional view of an electrode holder body of the welding torch of the present invention;
FIG. 6 is a schematic view of the structure of the electrical conductors in the welding torch of the present invention;
FIG. 7 is a schematic illustration of the configuration of a gas sedation device in a welding torch in accordance with the present invention;
FIG. 8 is a schematic cross-sectional view of a gas sedation device in a welding torch in accordance with the present invention;
FIG. 9 is a schematic view of a tungsten electrode holder assembly of the welding torch of the present invention;
FIG. 10 is a schematic cross-sectional view of a tungsten electrode holder in a welding torch according to the present invention;
FIG. 11 is a schematic view of the structure of a tungsten electrode clip in a welding torch according to the present invention;
fig. 12 is a schematic cross-sectional view of a waterproof nut in a welding torch of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1 to 12, the micro-area strong drainage tungsten electrode TIG welding torch for underwater local dry operation of the present embodiment comprises an electrode connecting device, a gas sedation device 3, a gas hood 5 and two tungsten electrodes 7. The gas sedation device 3 is arranged below the electrode connection device; a gas cap 5 is provided below the gas sedation device 3. The electrode connection means, the gas calming means 3 and the gas cap 5 together form a semi-closed cap. The tungsten electrode 7 is positioned in the semi-closed cover body; the tungsten electrode 7 is fixed on the electrode connecting device and is mechanically and electrically connected with an external cable through the electrode connecting device; the opening of the semi-closed cover body is positioned on the gas cover 5; the gas sedative device 3 is connected with an external gas supply device so as to realize that the protective gas provided by the external gas supply device is conveyed into the gas hood 5 through the gas sedative device 3, and the pressure difference between the inside and the outside of the gas hood 5 is formed so as to prevent water from entering the semi-closed hood body.
The electrode connecting device comprises an electrode seat and a waterproof nut 1; the electrode holder comprises an electrode holder body 2 with a receiving cavity, an electrode holder cover 4 and an electrical conductor 10. The electric conductor 10 is arranged in the accommodating cavity of the electrode holder body 2, and the electrode holder cover 4 is arranged above the accommodating cavity of the electrode holder body 2; the electrode holder body 2 is externally provided with a cable joint 11 for connecting an external cable; the conductor 10 is connected to a cable connector 11.
The electrode seat cover 4 and the electrode seat body 2 are made of insulating materials; the model of the cable connector 11 is waterproof; the material of the conductor 10 may be brass.
The upper part of the electrode seat body 2 is provided with a platform 201 for installing the electrode seat cover 4, the shape of the platform is the same as the external contour of the electrode seat cover 4, and the depth of the platform is the same as the thickness of the electrode seat cover 4; the accommodating cavity of the electrode holder body 2 is provided with two mounting grooves 202 for mounting the electric conductor 10, and the shape of the mounting grooves is the same as the external contour of the electric conductor 10; the lower part of the electrode holder body 2 is provided with a boss I204 for connecting with the gas sedation device 3.
The number of the conductors 10 is preferably two, and the conductors are respectively arranged in the accommodating cavities of the electrode seat body 2; the upper surface of the electrode base is contacted with the electrode base cover 4, and the side surface of the electrode base is contacted with the electrode base body 2; the upper end of the conductor 10 is arc-shaped and plays a limiting role to prevent sliding in the mounting groove 202; the conductor 10 has a blind hole in its lower plane for mounting the cable connector 11.
According to the electrode connecting device, the external part electrode seat cover 4 and the electrode seat body 2 are made of insulating materials, so that internal current is prevented from being conducted with water environment in underwater welding operation, and the safety of the device is improved; the conductor 10 of the internal part is made of brass with better conductivity and lower cost, and the cable joint 11 is waterproof, so that the current output by the welding power supply is ensured to be conducted to the conductor 10 and not conducted with water environment, and the safety of welding operation is ensured.
The gas sedation device 3 is provided with an air pipe joint 12 for connection with an external air supply device. The upper part of the gas sedation device 3 is matched with the outer diameter of a boss I204 below the electrode seat body 2. The gas sedan 3 is provided with a gas ballast chamber 301; the gas ballast chamber 301 is communicated with the gas pipe joint 12; a plurality of micro-air supply through holes 302 with small size are distributed on the chamber wall between the gas ballast chamber 301 and the gas hood 5 so as to realize the communication between the gas ballast chamber 301 and the gas hood 5, which is beneficial to the uniform distribution of the shielding gas. The lower part of the gas sedan device 3 is provided with a boss II 304 for connecting the gas hood 5. The gas sedation device 3 is provided with a through hole for installing the tracheal tube 12. A through hole four 303 is also formed in the wall between the gas ballast chamber 301 and the gas hood 5.
The material of the gas sedan device 3 is insulating material, and the air pipe joint 12 is waterproof.
The gas sedan device 3 is internally provided with the plurality of micro air supply through holes 302, and the structure has the advantages that during the underwater welding operation, protective gas is introduced into the gas sedan device 3 and uniformly distributed in the gas sedan chamber 301, when the air pressure in the gas sedan chamber 301 reaches a certain strength, the protective gas discharges water downwards through the micro air supply through holes 302 under the action of pressure, and the inside of a welding torch is ensured to be relatively dry during the underwater welding operation, so that the adverse effect of the water environment on the forming quality of welding seams is reduced; while also providing gas shielding during the welding process. The structure can effectively improve the drainage efficiency of the welding torch, and improve the welding efficiency while guaranteeing the welding quality.
In the embodiment, two tungsten electrodes 7 are provided; in practical application, the number of tungsten electrodes can be three, four or even more, and all tungsten electrodes are arranged in the same direction. A tungsten electrode fixing sleeve is arranged outside each tungsten electrode 7.
In this embodiment, the tungsten electrode fixing sleeve is a tungsten electrode clamping device. Each tungsten electrode clamping device comprises a conductive tungsten electrode clamp 6 and a conductive tungsten electrode clamp outer sleeve 8; the tungsten electrode clamp 6 is in a shaft shape; the tungsten electrode clamp 6 is provided with a clamp inner blind hole 601 with a downward orifice; the bottom of the tungsten electrode clamp 6 is provided with a claw 602; one end of the tungsten electrode 7 is arranged in the inner blind hole 601 of the clamp, and the other end extends out of the clamping jaw 602; the tungsten electrode clamp sleeve 8 is provided with a sleeve hole; the sleeved hole is matched with the outer part of the tungsten electrode clamp 6, the lower end of the sleeved hole is a conical hole 801, and the wall of the conical hole is contacted with a claw 602 at the bottom of the tungsten electrode clamp 6 so as to lock the tungsten electrode 7 by the tungsten electrode clamp 6; the tungsten electrode 7 is electrically connected with the electrode connecting device through the tungsten electrode clamp 6 and the tungsten electrode clamp jacket 8. The tungsten electrode clamp 6 and the tungsten electrode clamp jacket 8 are made of metal conductive materials.
The electrode seat cover 4 is provided with two through holes I matched with the outer diameter of the tungsten electrode clamp 6; the conductor 10 is provided with a through hole II matched with the outer diameter of the tungsten electrode clamp sleeve 8; the mounting groove 202 is provided with a third through hole 203 which is matched with the outer diameter of the tungsten electrode clamp sleeve 8.
The waterproof nut 1 is provided with a threaded blind hole 101. The joint of the waterproof nut 1 and the electrode seat cover 4 is sealed; specifically, an annular groove 102 is formed in one side of the waterproof nut 1, which is connected with the electrode seat cover 4, and a sealing ring 9 is arranged in the annular groove 102 to realize sealing at the connection part of the waterproof nut 1 and the electrode seat cover 4. The waterproof nut 1 and the sealing ring 9 are made of insulating materials. The waterproof nut 1 is made of an insulating material, so that the welding current is prevented from being conducted with the water environment, and the safety of welding operation is improved; the lower part of the waterproof nut 1 is provided with a sealing ring 9 which is tightly attached to the electrode seat cover 4, so that the tightness of the device can be ensured.
The tungsten electrode clamp 6 is preferably in the shape of a stepped shaft with a small upper part and a large lower part. The sleeve hole of the tungsten electrode clamp sleeve 8 is preferably in a step hole shape with a small upper part and a large lower part so as to realize mutual limitation of the tungsten electrode clamp 6 and the tungsten electrode clamp sleeve 8. The upper end of the tungsten electrode clamp 6 protrudes out of the tungsten electrode clamp outer sleeve 8 and is provided with external threads 603 which are in threaded connection with the threaded blind holes 101 of the waterproof nut 1. The first through hole of the electrode seat cover 4 is matched with the optical axis 604 of the tungsten electrode clamp 6; the tungsten electrode clamp sleeve 8 is matched with an optical axis 605 below the optical axis 604; the diameter of the tungsten electrode clamp 6 is 606, so that the limit function is realized; the tungsten electrode clamp sleeve 8 is in interference fit with the second through hole of the conductor 10 and the third through hole of the electrode holder body 2 in sequence.
The second through hole of the conductor 10, the third through hole of the electrode holder body 2 and the fourth through hole in the gas ballast chamber 4 are matched with the 802, 803 and 804 positions on the upper part of the tungsten electrode clamp sleeve 8 from top to bottom.
The gas cover is preferably a transparent gas cover, and can be completely transparent or partially transparent; glass materials may be used. On one hand plays the role of a drainage cover in welding operation, on the other hand, the combustion condition of the electric arc in the welding torch can be conveniently observed, and the real-time monitoring of the welding arc can be realized.
The tungsten electrode TIG welding torch of the embodiment can be applied to locking welding of a core plate locating pin and a nut of a reactor in a nuclear power station, and the welding work comprises the following steps:
s1, checking air tightness of an air supply device, checking bus connection and data transmission conditions of an industrial personal computer and other equipment, and checking whether an underwater automatic operation mechanism main body of a nuclear power station and an execution mechanism thereof can act according to a preset flow, so as to ensure that a pressure reducing valve can perform gas path on-off control and gas pressure control work according to control signals; after the inspection is finished, clamping a tungsten electrode TIG welding torch, and connecting the welding torch with the electricity and the gas of the positioning pin nut underwater welding system;
s2, lifting the actuating mechanism into an underwater irradiation working environment, moving the actuating mechanism to an upper reactor core plate where a positioning pin to be welded is located, and adjusting the position of a welding torch to position the welding torch to a nut to be welded; the industrial personal computer sends technological parameters to the pulse TIG welding power supply according to the selected welding mode, controls the air supply device to supply air in advance, drains the liquid in the cavity of the welding torch, and prepares to start welding;
s3, starting welding, starting a high-frequency arc striking circuit to strike an arc at high frequency and high voltage, and turning off the high-frequency arc striking circuit after the arc striking is successful; the pulse TIG welding power supply starts to output current, after welding of one welding spot is completed, the current is reduced and gradually decays until the electric arc is extinguished, and the main circuit is turned off; starting a converter, switching to another tungsten electrode to supply power, and finishing arc striking and welding operation of another welding spot; after a period of time, the air supply is stopped, and the whole welding process is finished. In the welding process, the gas in the welding torch continuously discharges water and prevents the water from entering the welding torch again under the condition that the internal and external pressure difference is positive;
s4, after welding is completed, the executing mechanism separates the welding torch from the welded position area, and welding of the next locating pin and the nut is prepared; and after all the areas to be welded are welded, the welding power supply is turned off, the gas circuit is cut off, and the executing mechanism is lifted.
Example two
The difference between the micro-area strong drainage tungsten electrode TIG welding torch for the underwater local dry operation and the first embodiment is that: in this embodiment, tungsten is one; the other structures of the welding torch are correspondingly adjusted according to the number of tungsten electrodes; for example, the tungsten electrode clamping device is one, the waterproof nut, the electric conductor and the cable joint are all one, and the first through hole formed on the electrode seat cover, the second through hole formed on the electric conductor, the third through hole formed on the electrode seat body and the fourth through hole formed on the gas sedation device are all one. The rest of the structure of this embodiment is the same as that of the first embodiment.
Example III
The difference between the micro-area strong drainage tungsten electrode TIG welding torch for the underwater local dry operation and the first embodiment is that: in this embodiment, the tungsten electrode fixing sleeve does not use a tungsten electrode clamping device, but uses other existing devices for sleeving and fixing tungsten electrodes and having a conductive function. The rest of the structure of this embodiment is the same as that of the first embodiment.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (3)
1. A micro-area strong drainage tungsten electrode TIG welding torch for local dry operation under water is characterized in that: comprises an electrode connecting device, a gas sedating device, a gas hood and more than two tungsten electrodes; all tungsten electrodes are arranged in the same direction; the gas sedation device is arranged below the electrode connection device; the gas hood is arranged below the gas sedation device; the electrode connecting device, the gas tranquilizing device and the gas hood are all in sealing connection; the electrode connecting device, the gas tranquilizing device and the gas hood jointly form a semi-closed hood body; the tungsten electrode is positioned in the semi-closed cover body; the tungsten electrode is fixed on the electrode connecting device and is mechanically and electrically connected with an external cable through the electrode connecting device; the opening of the semi-closed cover body is positioned on the air cover; the gas sedan device is connected with the external air supply device to realize that the protective gas provided by the external air supply device is conveyed into the gas hood through the gas sedan device, so that the pressure difference between the inside and the outside of the gas hood is formed to prevent water from entering the semi-closed hood body;
a tungsten electrode fixing sleeve is arranged outside the tungsten electrode; the upper end of the tungsten electrode fixing sleeve is fixed on the electrode connecting device, and the lower end of the tungsten electrode fixing sleeve extends out of the gas sedation device into the gas hood; the tungsten electrode fixing sleeve is in interference fit with the gas sedation device;
the tungsten electrode fixing sleeve is a tungsten electrode clamping device; the tungsten electrode clamping device comprises a conductive tungsten electrode clamp and a conductive tungsten electrode clamp outer sleeve; the tungsten electrode clamp is in a shaft shape; the tungsten electrode clamp is provided with a clamp inner blind hole with a downward orifice; the bottom of the tungsten electrode clamp is provided with a claw; one end of the tungsten electrode is arranged in the blind hole in the clamp, and the other end extends out of the clamping jaw; the tungsten electrode clamp is sleeved with a sleeved hole; the sleeved hole is matched with the outer part of the tungsten electrode clamp, the lower end of the sleeved hole is a conical hole, and the wall of the conical hole is contacted with a claw at the bottom of the tungsten electrode clamp so as to lock the tungsten electrode by the tungsten electrode clamp; the tungsten electrode is electrically connected with the electrode connecting device through the tungsten electrode clamp and the tungsten electrode clamp jacket;
the electrode connecting device comprises an electrode seat and a waterproof nut; the electrode seat is provided with a mounting through hole; the waterproof nut is provided with a threaded blind hole; the upper end of the tungsten electrode clamp protrudes out of the tungsten electrode clamp sleeve and is in threaded connection with the waterproof nut; the tungsten electrode clamping device is matched with the mounting through hole of the electrode seat; the joint of the waterproof nut and the electrode seat is sealed;
the electrode seat comprises an electrode seat body with a containing cavity, an electrode seat cover and an electric conductor; the electric conductor is arranged in the accommodating cavity of the electrode seat body, and the electrode seat cover is arranged above the accommodating cavity of the electrode seat body; the outer part of the electrode seat body is provided with a cable connector for connecting an external cable; the conductor is connected with the cable joint; the mounting through hole comprises a first through hole formed in the electrode seat cover, a second through hole formed in the conductor and a third through hole formed in the electrode seat body; the tungsten electrode clamp is matched with the first through hole; the tungsten electrode clamp sleeve is contacted and matched with the through hole in two phases so as to realize electric connection with the electric conductor; the tungsten electrode clamp outer sleeve is also matched with the through hole III;
the lower part of the electrode seat body is provided with a boss I for connecting a gas sedation device; the upper part of the gas sedation device is matched with an outer diameter of a boss below the electrode seat body; the gas sedan is provided with a gas calm chamber; the side wall of the gas ballast chamber is provided with an air pipe joint used for being connected with an external air supply device; a plurality of micro air supply through holes are distributed on the chamber wall between the gas quiet chamber and the gas hood so as to realize the communication between the gas quiet chamber and the gas hood; the lower part of the gas sedan is provided with a boss II for connecting the gas hood;
and a through hole IV is formed in the chamber wall between the gas ballast chamber and the gas hood, and the tungsten electrode fixing sleeve is matched with the through hole IV.
2. The micro-area strong drainage Tungsten Inert Gas (TIG) welding torch for underwater local dry work according to claim 1, wherein: the tungsten electrode clamp is in a stepped shaft shape with a small upper part and a large lower part, and the sleeved hole of the tungsten electrode clamp sleeve is in a stepped hole shape with a small upper part and a large lower part, so that the tungsten electrode clamp and the tungsten electrode clamp sleeve are mutually limited.
3. The micro-area strong drainage Tungsten Inert Gas (TIG) welding torch for underwater local dry work according to claim 1, wherein: the accommodating cavity of the electrode seat body is provided with an installing groove; the conductor is arranged in the mounting groove to realize positioning and fixing.
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| CN202210174295.9A CN114734118B (en) | 2022-02-24 | 2022-02-24 | Micro-area strong drainage tungsten electrode TIG welding torch for underwater local dry operation |
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| CN202210174295.9A CN114734118B (en) | 2022-02-24 | 2022-02-24 | Micro-area strong drainage tungsten electrode TIG welding torch for underwater local dry operation |
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| CN114734118B true CN114734118B (en) | 2023-12-22 |
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| CN114734118A (en) | 2022-07-12 |
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