CN110948106A - Sealing weld joint all-in-one machine of nuclear reactor control rod driving mechanism and operation method - Google Patents
Sealing weld joint all-in-one machine of nuclear reactor control rod driving mechanism and operation method Download PDFInfo
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- CN110948106A CN110948106A CN201911059496.9A CN201911059496A CN110948106A CN 110948106 A CN110948106 A CN 110948106A CN 201911059496 A CN201911059496 A CN 201911059496A CN 110948106 A CN110948106 A CN 110948106A
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- control rod
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/12—Means for moving control elements to desired position
- G21C7/14—Mechanical drive arrangements
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- 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)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides a nuclear reactor control rod driving mechanism sealing weld joint all-in-one machine which is characterized by comprising an outer sleeve shell 1, an inner sleeve shell 2, an axial movement driving mechanism 3, a rotary movement driving mechanism 4, a laser processing head assembly 5, a wire feeding nozzle and inert gas nozzle 6, a camera 7, a back inert gas nozzle 8 and a dust suction nozzle 11. The technology is applied to cutting, welding and repairing omega or CANOPY welding seams of the control rod driving mechanism of the nuclear reactor, and has the advantages of simple and reliable structure, low power consumption, integration of cutting and welding, no cutting chips in the cutting process, flat cut without reprocessing, small heat affected zone in the cutting and welding process, high automation degree, high process stability and the like.
Description
Technical Field
The invention belongs to the field of design of operation and maintenance tools of nuclear power plants, and particularly relates to novel tool equipment for cutting, welding and maintaining a seal weld joint of a control rod driving mechanism.
Background
The nuclear reactor control rod drive mechanism is an important device for taking charge of the tasks of reactor power regulation and emergency shutdown, and a sealing shell of the nuclear reactor control rod drive mechanism belongs to a loop pressure boundary. According to HAF102 design safety regulations of nuclear power plants, the control rod driving mechanism is a nuclear safety primary device.
The magnetic lifting type control rod driving mechanism is the most widely applied control rod driving mechanism design type at present, and the core functional part of the magnetic lifting type control rod driving mechanism is a claw part sealed in the pressure boundary of a loop. To service or replace the hook members, the control rod drive mechanism seal housing must be cut and re-welded.
With the gradual increase of the degree of participation of a nuclear power plant in power regulation of a power grid, the step-by-step service life of a hook component of a control rod driving mechanism cannot meet the time service life requirement of a nuclear reactor, and the requirement of replacing the hook component is listed in a power plant overhaul plan. In addition, the leakage problem occurs to the sealing weld of the control rod driving mechanism of the reactor in service for many times, and the requirement of the in-service maintenance of the sealing weld of the control rod driving mechanism is urgently needed to be met.
The existing tools for cutting and welding the sealing weld of the control rod driving mechanism equipped in part of nuclear power operation and maintenance units are independent rotary milling or cutter head type cutting machines and independent argon arc welding machines. The existing cutting and welding tool has a mature technology, but has the problems that cutting and welding are split, cutting pollution is generated during cutting, a welding groove needs to be repaired after cutting, a welding heat affected zone is large, deformation is easy to occur, repeated cutting and welding are carried out for a few times, and the like.
Disclosure of Invention
The invention aims to provide novel tool equipment for cutting, welding and maintaining a sealed welding seam of a control rod driving mechanism. The technology is applied to cutting, welding and repairing omega or CANOPY welding seams of the control rod driving mechanism of the nuclear reactor, and has the advantages of simple and reliable structure, low power consumption, integration of cutting and welding, no cutting chips in the cutting process, flat cut without reprocessing, small heat affected zone in the cutting and welding process, high automation degree, high process stability and the like.
A nuclear reactor control rod driving mechanism sealing weld joint all-in-one machine comprises an outer sleeve shell 1, an inner sleeve shell 2, an axial movement driving mechanism 3, a rotary movement driving mechanism 4, a laser processing head assembly 5, a wire feeding nozzle and inert gas nozzle 6, a camera 7, a back inert gas nozzle 8 and a dust absorption nozzle 11;
the outer casing shell 1 accommodates and supports the internal components of the handpiece; the inner sleeve shell 2 is closely matched with the excircle of the upper section of the control rod driving mechanism sealing shell through a smooth transitional conical surface; the inner ring of the axial motion driving mechanism 3 is fixed on the inner sleeve shell 2, and the outer ring of the axial motion driving mechanism 3 is fixed on the outer sleeve shell 1 and used for driving the outer sleeve shell 1 to axially move relative to the inner sleeve shell 2; the inner ring of the rotary motion driving mechanism 4 is fixed on the inner sleeve shell 2, and the outer ring of the rotary motion driving mechanism 4 is fixed on the outer sleeve shell 1 and is used for driving the outer sleeve shell 1 to do circular rotary motion relative to the inner sleeve shell 2; the laser processing head assembly 5 is connected with the outer sleeve shell 1, and focuses and folds laser energy to converge on a part to be cut or welded; the wire feeding nozzle and the front inert gas nozzle 6 are connected with the outer sleeve shell 1 and used for spraying the welding wire feeding and the protective gas on the front of the welding lug; the camera 7 is connected with the outer sleeve shell 1 and sends a real-time image of a cutting or welding part; the back inert gas nozzle 8 is connected with the outer sleeve shell 1, and protective gas is sprayed on the back of the welding lug; the dust suction nozzle 11 is connected with the outer sleeve shell 1 and is used for absorbing metal steam and slag in the cutting operation process.
Preferably, a plurality of positioning wheels are mounted at the bottom of the inner sleeve shell 2 for bearing the weight of the handpiece.
Preferably, the laser processing head assembly 5 comprises a laser fiber connector, a focusing lens, a laser nozzle and a reflector, wherein the laser fiber connector is connected with the laser nozzle, the focusing lens focuses the laser in the laser nozzle, and the laser beam passes through the reflector to reach a position to be welded.
Preferably, the cameras 7 are double cameras, one camera is used for positioning and observing, and the other camera is used for observing the molten pool during cutting or welding.
A method of operating a nuclear reactor control rod drive mechanism seal weld all-in-one machine, comprising 1) a cut mode: sleeving the integrated machine on a control rod driving mechanism sealing shell, controlling the axial movement driving mechanism 3 and the rotary movement driving mechanism 4 in the integrated machine to operate, aligning the laser processing head assembly 5 to the position of a welding seam, cutting the welding seam, keeping the monitoring of the camera 7 in the cutting process, and sucking away metal steam and slag through the dust suction nozzle 11; 2) and (3) welding mode: the laser processing head assembly 5 is controlled to operate by the rotary motion driving mechanism 4, base metal on two sides of a control rod driving mechanism seal shell is self-melted and resealed by laser heating, if the welding seam interval is larger, welding is carried out by a wire filling welding mode of the wire feeding nozzle and the front inert gas nozzle 6, and inert gas protection is provided for a molten pool and the back by the back inert gas nozzle 8 in the welding process; 3) and (3) maintenance mode: the all-in-one machine is directly passed through on the basis of the original welding seam the axial motion driving mechanism 3 and the laser processing head assembly 5 is controlled by the cooperation between the rotary motion driving mechanisms 4 to align the welding seam position, and a laser multi-channel multilayer surfacing thickening welding lug is adopted.
The invention realizes the integration of cutting and welding functions by adjusting the power and the moving speed of the laser, and has the functions of remote control, video monitoring, axial and radial accurate positioning, welding shielding gas, welding wire feeding, cutting and dust collection. The construction cutting notch is narrow and high in precision, two sides of the cutting seam are parallel, and the cutting surface is smooth and flat without trimming; the welding construction has small heat input, small molten pool, narrow welding line, small welding heat affected zone and small generated deformation; the whole machine has the advantages of simple structure, low power consumption, stable construction quality, and repeated cutting and welding.
Drawings
FIG. 1 is a schematic structural view of a welding, cutting and maintaining all-in-one machine for sealing a weld joint of a control rod driving mechanism. 1-outer casing tube shell; 2-inner sleeve shell; 3-axial movement driving mechanism; 4-a rotary motion drive mechanism; 5, processing a laser; 6-wire feeding pipe nozzle and front inert gas nozzle; 7, a camera; 8-back inert gas nozzle; 9-control rod drive mechanism seal shell upper segment (rod stroke shell); 10-control rod drive mechanism seal shell lower section (hook housing); 11-dust suction nozzle;
FIG. 2 shows the weld configuration at various stages.
1-original weld morphology; 2-the shape of the cut weld; 3, welding seam shape after laser self-welding; 4, compensating the welded welding line shape by wire feeding filler; 5, welding seam shape after multi-layer and multi-channel surfacing leakage repairing;
fig. 3 shows the laser path when the cut-through occurs.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core components of the present invention are described in detail below: the control rod drive mechanism seals the welding seam with welding, cutting, maintenance all-in-one aircraft nose structure, as shown in figure 1:
the outer sleeve shell has the function of containing and supporting the internal components of the handpiece, and the outer sleeve shell is connected with the inner sleeve shell through an axial motion driving mechanism and a rotary motion driving mechanism.
The outer circle of the inner sleeve shell is tightly matched with the outer circle of the upper section (rod stroke shell) of the control rod driving mechanism sealing shell to play a positioning role, and a plurality of positioning wheels are arranged at the bottom of the inner sleeve shell and used for bearing the weight of the machine head.
The inner ring of the axial motion driving mechanism is fixed on the inner sleeve shell, the outer ring of the axial motion driving mechanism is fixed on the outer sleeve shell, and the two rings are actuated through driving structures such as gears or chains and the like to drive the outer sleeve shell to axially move relative to the inner sleeve shell.
The inner ring of the rotary motion driving mechanism is fixed on the inner sleeve shell, the outer ring of the rotary motion driving mechanism is fixed on the outer sleeve shell, and the two rings are actuated through driving structures such as gears or chains and the like and used for driving the outer sleeve shell to do circular rotary motion relative to the inner sleeve shell.
The laser processing head assembly comprises parts such as a laser optical fiber connector, a focusing lens, a laser nozzle, a reflector and the like. The laser processing head component is connected with the outer sleeve shell and can rotate and axially move along with the outer sleeve shell, so that the laser processing head component has the function of focusing and folding laser energy and converging the laser energy at a part to be cut or welded.
The wire feeding nozzle and the front inert gas nozzle are connected with the outer sleeve shell, can rotate and axially move along with the outer sleeve shell, and are always aligned with a welding position to provide guidance for wire feeding of a welding wire and shielding gas injection on the front of a welding lug.
The camera (with double cameras, one is used for positioning and observing, and the other is used for observing the molten pool during cutting or welding) is connected with the outer sleeve shell, can rotate and axially move along with the outer sleeve shell, always aims at the welding position, and sends a real-time image of the cutting or welding position for the remote control computer.
The back inert gas nozzle is connected with the outer sleeve shell and can rotate and axially move along with the outer sleeve shell to align to a notch which is not welded, and protective gas is sprayed into the welding lug in advance before welding operation is started so as to provide a protective gas environment for the back of the welding lug.
The upper section of the control rod drive mechanism seal shell and the lower section of the control rod drive mechanism seal shell are two parts forming the control rod drive mechanism seal shell, and a welding seam between the two parts is a part needing repeated cutting and welding.
The dust absorption nozzle is connected with the outer sleeve shell, can rotate and axially move along with the outer sleeve shell, always aims at a construction part, and sends metal steam and slag into the welding slag containing bottle after being absorbed in the cutting operation process.
The invention also comprises a remote control computer, a laser generator, a laser fiber, a control and power supply cable, a gas cylinder, a gas supply pipeline, a welding slag containing bottle and other accessory equipment except for the cutting, welding and maintaining integrated machine head for sealing the welding seam of the control rod driving mechanism.
The following describes in detail several possible forms of the joint cutting and welding when the present invention is used for sealing the welding seam of the control rod drive mechanism of a nuclear reactor, as shown in fig. 2:
(1) is the original form of the weld.
(2) The invention is used for finishing cutting by stacking original welding seams, and the welding seam material is rapidly melted and gasified under the action of laser and forms a section shape of a cutting seam after being extracted by a dust suction nozzle.
(3) The invention has the advantages that the slit gap after cutting is large, laser self-fusion welding cannot be implemented, laser wire filling welding is adopted, and welding wire materials are melted and filled under the action of laser to form a welding seam shape with certain extra height. And after the cut joint is subjected to laser self-fusion welding, melting upper and lower materials of the welding seam, and re-adhering to form the section shape of the welding seam. Because the cutting seam needs to be filled by melting base materials at two sides, a shallow groove is formed on the surface of the welding seam finally (if necessary, the surface can be covered by adopting wire filling welding). And performing rapid surfacing maintenance on the leaked sealing welding lug to form a welding seam section shape. Under the condition, cutting is not needed, the gas shielded wire feeding laser surfacing welding is directly carried out on the original welding lug by adopting the method, after the welding wire is melted, a plurality of layers of welding passes are formed on the outer surface of the original welding lug and are mutually overlapped and covered, and the complete blocking of the cracking and perforating parts is ensured.
In addition, as shown in fig. 3, the laser energy density passing through the welding lug is reduced by setting a reasonable focal length of the laser lens, so that the damage of excessive laser to the internal structure of the control rod driving mechanism seal shell during the cut-through can be avoided.
The operation method for sealing the welding seam of the control rod driving mechanism of the nuclear reactor by using the invention is described in detail as follows:
cutting mode: sleeving the integrated machine on a control rod driving mechanism sealing shell, controlling and operating the axial movement driving mechanism 3 and the rotary movement driving mechanism 4 in the integrated machine, aligning the laser processing head assembly 5 to the position of a welding seam, cutting the welding seam, keeping the monitoring of the camera 7 in the cutting process, and sucking away metal steam and slag through the dust suction nozzle 11.
And (3) welding mode: the laser processing head assembly 5 is controlled to operate through the rotary motion driving mechanism 4, base metal on two sides of a control rod driving mechanism sealing shell is self-melted and resealed through laser heating, if the welding seam interval is large, welding is carried out through a wire filling welding mode of the wire feeding nozzle and the front inert gas nozzle 6, and inert gas protection is provided for a molten pool and the back through the back inert gas nozzle 8 in the welding process.
And (3) maintenance mode: the all-in-one machine is directly passed through on the basis of the original welding seam the axial motion driving mechanism 3 and the laser processing head assembly 5 is controlled by the cooperation between the rotary motion driving mechanisms 4 to align the welding seam position, and a laser multi-channel multilayer surfacing thickening welding lug is adopted.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims. The device design scheme provided by the invention can be applied to any pressurized water reactor control rod drive mechanism sealing structure to carry out cutting, welding and maintenance operation of welding seams.
Claims (5)
1. A nuclear reactor control rod driving mechanism sealing weld joint all-in-one machine is characterized by comprising an outer sleeve shell (1), an inner sleeve shell (2), an axial movement driving mechanism (3), a rotary movement driving mechanism (4), a laser processing head assembly (5), a wire feeding nozzle, an inert gas nozzle (6), a camera (7), a back inert gas nozzle (8) and a dust suction nozzle (11);
the outer casing shell (1) accommodates and supports the internal components of the handpiece;
the inner sleeve shell (2) is tightly matched with the excircle of the upper section of the control rod driving mechanism sealing shell through a smooth transitional conical surface;
the inner ring of the axial motion driving mechanism (3) is fixed on the inner sleeve shell (2), and the outer ring of the axial motion driving mechanism (3) is fixed on the outer sleeve shell (1) and used for driving the outer sleeve shell (1) to axially move relative to the inner sleeve shell (2);
the inner ring of the rotary motion driving mechanism (4) is fixed on the inner sleeve shell (2), and the outer ring of the rotary motion driving mechanism (4) is fixed on the outer sleeve shell (1) and used for driving the outer sleeve shell (1) to do circular rotary motion relative to the inner sleeve shell (2);
the laser processing head assembly (5) is connected with the outer sleeve shell (1) and focuses and folds laser energy to converge on a part to be cut or welded;
the wire feeding nozzle and the front inert gas nozzle (6) are connected with the outer sleeve shell (1) and used for spraying the welding wire to feed the wire and the protective gas on the front of the welding lug;
the camera (7) is connected with the outer sleeve shell (1) and sends a real-time image of a cutting or welding part;
the back inert gas nozzle (8) is connected with the outer sleeve shell (1), and protective gas is sprayed on the back of the welding lug;
the dust suction nozzle (11) is connected with the outer sleeve shell (1) and is used for absorbing metal steam and slag in the cutting operation process.
2. The cutting, welding and maintaining all-in-one machine for the sealed weld of the control rod driving mechanism of the nuclear reactor as claimed in claim 1, characterized in that a plurality of positioning wheels are installed at the bottom of the inner sleeve shell (2) and are used for bearing the weight of a machine head.
3. The all-in-one machine for cutting, welding and maintaining the seal weld of the control rod driving mechanism of the nuclear reactor as set forth in claim 1, characterized in that the laser processing head assembly (5) comprises a laser fiber joint, a focusing lens, a laser nozzle and a reflector, the laser fiber joint is connected with the laser nozzle, the laser in the laser nozzle is focused by the focusing lens and is subjected to laser beam to a position to be welded through the reflector.
4. The cutting, welding and maintaining all-in-one machine for the sealed weld of the control rod driving mechanism of the nuclear reactor as claimed in claim 1, characterized in that the cameras (7) are double cameras, one camera is used for positioning and observation, and the other camera is used for observing a molten pool during cutting or welding.
5. An operation method of a sealing weld joint all-in-one machine of a control rod driving mechanism of a nuclear reactor is characterized in that,
cutting mode: sleeving the integrated machine on a control rod driving mechanism sealing shell, controlling the axial movement driving mechanism (3) and the rotary movement driving mechanism (4) in the integrated machine to operate, aligning the laser processing head assembly (5) to the position of a welding seam, cutting the welding seam, keeping the monitoring of the camera (7) in the cutting process, and sucking away metal steam and slag through the dust suction nozzle (11);
and (3) welding mode: the laser processing head assembly (5) is controlled to operate through the rotary motion driving mechanism (4) and laser heating is carried out to enable base metal on two sides of a control rod driving mechanism seal shell to be self-melted and resealed, if the distance between welding seams is large, welding is carried out through a wire filling welding mode of the wire feeding nozzle and the front inert gas nozzle (6), and inert gas protection is provided for a molten pool and the back through the back inert gas nozzle (8) in the welding process;
and (3) maintenance mode: the all-in-one machine is directly passed through on the basis of the original welding seam, the axial motion driving mechanism (3) and the laser processing head assembly (5) are controlled to align the welding seam position through the cooperation between the rotary motion driving mechanisms (4), and the laser multi-channel multi-layer surfacing thickening welding lug is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911059496.9A CN110948106A (en) | 2019-11-01 | 2019-11-01 | Sealing weld joint all-in-one machine of nuclear reactor control rod driving mechanism and operation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911059496.9A CN110948106A (en) | 2019-11-01 | 2019-11-01 | Sealing weld joint all-in-one machine of nuclear reactor control rod driving mechanism and operation method |
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| CN110948106A true CN110948106A (en) | 2020-04-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113385812A (en) * | 2021-05-31 | 2021-09-14 | 中国工程物理研究院材料研究所 | Self-fusion welding sealing method for laser end face of small-pipe-diameter thin-wall metal conduit coreless rod |
| CN114850669A (en) * | 2022-04-28 | 2022-08-05 | 中铁第四勘察设计院集团有限公司 | Welding equipment and welding method for high-speed magnetic levitation low-vacuum pipeline |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113385812A (en) * | 2021-05-31 | 2021-09-14 | 中国工程物理研究院材料研究所 | Self-fusion welding sealing method for laser end face of small-pipe-diameter thin-wall metal conduit coreless rod |
| CN114850669A (en) * | 2022-04-28 | 2022-08-05 | 中铁第四勘察设计院集团有限公司 | Welding equipment and welding method for high-speed magnetic levitation low-vacuum pipeline |
| CN114850669B (en) * | 2022-04-28 | 2023-06-02 | 中铁第四勘察设计院集团有限公司 | Welding equipment and welding method for high-speed magnetic levitation low-vacuum pipeline |
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Application publication date: 20200403 |