CN117620613A - Pressure vessel welding methods - Google Patents
Pressure vessel welding methods Download PDFInfo
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- CN117620613A CN117620613A CN202311693561.XA CN202311693561A CN117620613A CN 117620613 A CN117620613 A CN 117620613A CN 202311693561 A CN202311693561 A CN 202311693561A CN 117620613 A CN117620613 A CN 117620613A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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 for a procedure covered by only one of the other main groups of this subclass
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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 for a procedure covered by only one of the other main groups of this subclass
- B23K37/08—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for flash removal
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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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
本发明涉及焊接技术领域，具体为压力容器焊接方法。压力容器焊接方法，包括以下步骤：SS001、装夹，焊接前，将压力容器的尾段和焊接段均固定于焊接设备中，SS002、整形，SS001步骤后，将压力容器的尾段与焊接段贴合为一体，并形成待焊环缝，焊接设备采用整形工艺对待焊环缝进行整圆定形，SS003、焊接，SS002步骤后，焊接设备对整圆定形完毕后的待焊环缝进行一次打磨，一次打磨后，焊接设备对待焊环缝进行焊接，焊缝充分冷却固化完毕后，焊接设备对焊接后所形成的焊环进行二次打磨。本发明的有益效果是：本发明焊接时，传动电机以设定速度驱动两个夹筒同步同速旋动，夹筒旋动后，继而通过整形外辊和整形内辊的作用实现对待焊环缝的整圆定形。
The present invention relates to the field of welding technology, specifically a pressure vessel welding method. The pressure vessel welding method includes the following steps: SS001, clamping, before welding, fix the tail section and welding section of the pressure vessel in the welding equipment, SS002, shaping, after step SS001, fix the tail section and welding section of the pressure vessel Fit into one body and form a ring seam to be welded. The welding equipment uses a shaping process to shape the ring seam to be welded. After SS003, welding and SS002 steps, the welding equipment polishes the ring seam to be welded after the full circle shape is completed. , after primary grinding, the welding equipment will weld the ring seam to be welded. After the weld seam is fully cooled and solidified, the welding equipment will grind the welded ring formed after welding a second time. The beneficial effects of the present invention are: when welding in the present invention, the transmission motor drives the two clamps to rotate synchronously and at the same speed at a set speed. After the clamps rotate, the ring to be welded is realized through the action of the shaping outer roller and the shaping inner roller. Shape the entire circle of the seam.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding method of a pressure container.
Background
The pressure vessel generally stores high-pressure gas or liquid, so that the sealing requirement on the pressure vessel is high, most of the pressure vessels are in a cylinder structure, when the volume is large, the pressure vessel is often formed by welding multiple sections of cylinders, the reliability of the welding process is a key for determining the integral tightness of the pressure vessel to reach the standard, but the conventional production process is usually completed through manual welding, the manual welding is time-consuming and labor-consuming, the working efficiency is low, and meanwhile, errors and manufacturing flaws are easy to occur in manual welding, so that the product quality and the use safety are influenced.
In the prior art, publication number CN108673041A is a welding device and a welding method special for a pressure container, the welding device comprises a frame and a cross beam, a driving roller is arranged below the frame, a first driving motor is arranged on the side face of the driving roller, the cross beam is positioned above the frame, a second driving motor is arranged on the side face of the cross beam, a coupler is arranged on the side face of the second driving motor, the compression fixation of a container to be welded can be facilitated, the device can apply component force which is tightly adhered to each other to two welding parts, and the fitting welding of the parts is facilitated, but the welding device and the welding method cannot carry out rounding shaping and polishing on the welding position of the pressure container when carrying out welding operation, so that the accuracy of butt welding of the pressure container is low.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a welding method of a pressure container to solve the problem that the conventional welding device cannot carry out rounding, shaping and polishing on the welding position of the pressure container, so that the precision of the butt welding of the pressure container is lower.
The technical scheme for solving the technical problems is as follows: a method of welding a pressure vessel comprising the steps of:
SS001, clamping, and fixing the tail section and the welding section of the pressure vessel in welding equipment before welding;
after the step of SS002 and shaping and the step of SS001, the tail section and the welding section of the pressure vessel are attached into a whole, a circumferential seam to be welded is formed, and the welding equipment adopts a shaping process to carry out rounding shaping on the circumferential seam to be welded;
carrying out SS003 and welding, wherein after the step of SS002, the welding equipment carries out primary polishing on the annular seam to be welded after finishing the whole circle shaping, after the primary polishing, the welding equipment carries out welding on the annular seam to be welded, and after the welding seam is fully cooled and solidified, the welding equipment carries out secondary polishing on the welded annular seam;
the welding equipment comprises a welding frame, two symmetrically arranged screw rod driving modules a are arranged in the welding frame, clamping mechanisms are connected to the peripheral sides of the screw rod driving modules a in a transmission mode, a welding grinding mechanism and a transmission module connected with the two clamping mechanisms in a transmission mode are respectively arranged on the surface of the welding frame, and a shaping mechanism is fixedly arranged on the surface of the clamping mechanism.
The beneficial effects of the invention are as follows:
1) When the welding machine is used for welding, butt welding operation of the pressure container can be efficiently completed, during welding, the transmission motor drives the two clamping cylinders to synchronously rotate at the same speed at a set speed, after the clamping cylinders rotate, the whole circle shaping of the annular seam to be welded is realized through the action of the shaping outer roller and the shaping inner roller, and the welding precision of the annular seam to be welded is effectively improved through the realization of the whole circle shaping effect.
2) After the whole circle is shaped, the polishing motor drives the annular polishing belt to rotate at a set speed, when the annular polishing belt moves, the surface of the annular polishing belt is clung to a to-be-welded annular seam after the whole circle is shaped at a set pressure, polishing operation is carried out, the uneven rate of the seam between the tail section and the welding section of the pressure container is reduced through the realization of polishing effect, and then the welding precision and the welding effect of the annular welding seam are improved in an auxiliary mode.
On the basis of the technical scheme, the invention can be improved as follows.
Further, fixture includes and welds frame sliding connection and through lead screw drive module a driven clamp frame, the inner wall of clamp frame rotates respectively and is connected with a clamp section of thick bamboo and transmission coil, the transmission coil passes through the drive of transmission module, the week side of transmission coil passes through the belt and is connected with a clamp section of thick bamboo transmission, the internally mounted of a set of clamp section of thick bamboo is the centre gripping push rod of circumference array distribution, and the equal fixed mounting of tip of every group clamp push rod has arc splint.
Further, the transmission module respectively comprises a transmission shaft which is horizontally arranged and rotationally connected between the inner surfaces of the welding frames and a transmission motor which is fixed on the side surfaces of the welding frames, the output shaft end of the transmission motor is fixedly connected with the transmission shaft, the transmission coil is of a hollow tubular structure with two open ends, the inner cavity of the transmission coil is regular polygon, and the cross section of the transmission shaft is matched with the inner cavity of the transmission coil.
The beneficial effect of adopting the further proposal is that when in use, the transmission shaft can continuously and effectively drive the transmission coil in the two clamping mechanisms through the shape arrangement of the inner cavity of the transmission coil and the cross section arrangement of the transmission shaft, thereby ensuring that the clamping mechanisms are in the process of changing the positions;
before the pressure vessel is welded, the tail section of the pressure vessel and the welding section of the pressure vessel are respectively fixed in two clamping mechanisms, and during clamping operation, the clamping push rods synchronously work, so that the clamping inner diameter formed by a group of arc clamping plates is changed;
when the pressure vessel is in a welding, polishing or shaping mode, the transmission motor drives the two clamping cylinders to synchronously rotate at the same speed.
Further, plastic mechanism includes plastic frame, a set of interior strut and two symmetrically set up of being circumference array distribution guide seat respectively, the surface of plastic frame with one press from both sides frame fixed connection in the fixture, the inside fixed mounting of plastic frame has lead screw transmission module b, the week side transmission of lead screw transmission module b is connected with the movable frame, the inner wall fixed mounting of movable frame has two symmetrically set up guide bars, the inner wall rotation of movable frame is connected with the roll adjustment lead screw that drives through accommodate motor, the week side symmetry of roll adjustment lead screw is provided with forward screw portion and reverse screw portion, the week side of forward screw portion and reverse screw portion is connected with two guide seat transmissions respectively, guide seat's inner wall and guide bar sliding connection, all articulate the connecting rod between the relative surface of interior strut and two guide seats, the inner wall rotation of interior strut is connected with the plastic inner roller, the internally mounted of plastic frame has the guide bar of two symmetry settings, the bottom fixed mounting of push bar has and gives the platform, two symmetrical pressure application roller connection have two pressure application roller pairs to install between the surface of exerting pressure application roller pair.
The welding method has the advantages that before welding operation, the tail section of the pressure container is attached to the welding section to form a ring seam to be welded, after the ring seam to be welded is formed, the two screw rod driving modules a are matched with the screw rod driving modules b, so that the ring seam to be welded is moved to the central positions of the shaping outer roller and the shaping inner roller, after the ring seam to be welded is moved, the distance adjusting screw rods are driven by the two driving seats, the arrangement positions of a group of clamping frames are synchronously changed, the positions of the shaping inner roller are changed, after the position of a group of shaping inner rollers is adjusted, the surface of the shaping inner roller is fully attached to the inner wall of the pressure container, after the position of the shaping inner roller is adjusted, the driving of the pressing push rod is carried out, the two shaping outer rollers are tightly attached to the outer wall of the pressure container, after the ring seam to be welded is tightly attached, the driving motor drives the two clamping drums to synchronously rotate at the same speed, the shaping outer roller and the shaping inner roller are synchronously rotated, the shaping inner roller is used for shaping ring seam shaping, and the ring seam to be welded is shaped through the effect of shaping inner roller is effectively, and the welding precision is improved.
Further, the lead screw driving module a and the lead screw transmission module b both comprise a driving motor and a driving lead screw, the output shaft end of the driving motor is fixedly connected with the driving lead screw, and the axis of the driving lead screw is parallel to the axis of the clamping cylinder.
Further, the welding machine constructs including annular polishing area and with welding frame fixed connection's lifting frame respectively, the internally mounted of lifting frame has two lead screw lifting module that the symmetry set up, the inner wall of lifting frame is sliding connection respectively has frame and welding table of polishing, the inner wall of frame and welding table is connected with two lead screw lifting module transmission respectively, the internally mounted of welding table has the welding module, rotate respectively between the internal surface of frame of polishing and be connected with driving roll and the driven voller that two symmetries set up, the week side of driving roll and two driven voller all is connected with annular polishing area transmission, the side fixed mounting of frame of polishing has the motor of polishing, the output axle head and the driving roll fixed connection of motor of polishing.
The beneficial effect of adopting above-mentioned further scheme is, after the whole circle takes shape, the motor of polishing drives annular polishing area rotation with the settlement speed, and when annular polishing area moves, the annular polishing area with the settlement pressure with wait to weld the girth and hug closely after the whole circle takes shape, then polish the operation, through the realization of effect of polishing to reduce the unevenness of pressure vessel's tail section and welding section seam crossing, then supplementary welding precision and the welding effect that improves the girth.
Further, the driving roller is arranged between two driven rollers, the driven rollers are arranged below the driving roller, and the axes of the driving roller and the driven rollers are parallel to the axis of the clamping cylinder.
Further, the welding module comprises a welding machine fixed on the surface of the welding frame and a welding gun fixed inside the welding table, and a port of the welding machine is connected with the welding gun through a cable.
Further, the lead screw lifting module comprises a lifting lead screw vertically arranged and rotationally connected to the inner wall of the lifting frame and a lifting motor fixed on the surface of the lifting frame, and the output shaft end of the lifting motor is in transmission connection with the lifting lead screw.
Drawings
FIG. 1 is a schematic view showing the overall structure of a welding apparatus used in a welding method of a pressure vessel according to the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective in accordance with the present invention;
FIG. 3 is a schematic view of the structure of the lifting frame and the screw lifting module of the invention;
FIG. 4 is a schematic view of the structure of FIG. 3 from another perspective in accordance with the present invention;
FIG. 5 is a schematic view of the structure of the clamping frame and the clamping cylinder of the invention;
FIG. 6 is a schematic view of the structure of the moving frame and the pressing push rod of the present invention;
FIG. 7 is a schematic view of a partial enlarged structure of the present invention at A in FIG. 6;
fig. 8 is a partially enlarged schematic view of the structure of fig. 6B according to the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. a welding device; 2. welding a frame; 3. a screw rod driving module a; 4. a clamping frame; 5. a clamping cylinder; 6. a drive coil; 7. clamping the push rod; 8. an arc clamping plate; 9. a transmission shaft; 10. shaping frame; 11. an inner bracket; 12. a guide seat; 13. a screw rod transmission module b; 14. a moving rack; 15. a guide rod; 16. adjusting a motor; 17. a distance adjusting screw rod; 18. a connecting rod; 19. shaping the inner roller; 20. a pressing push rod; 21. a pressure feeding table; 22. a pressing seat; 23. a pressure sensor; 24. shaping an outer roller; 25. an endless sanding belt; 26. a lifting frame; 27. a screw rod lifting module; 28. polishing a frame; 29. a welding table; 30. a drive roll; 31. driven roller; 32. polishing a motor; 33. a welding gun; 34. welding machine; 35. and (5) a transmission motor.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
The present invention provides the following preferred embodiments
As shown in fig. 1-8, the pressure vessel welding method comprises the steps of:
SS001, clamping, and fixing the tail section and the welding section of the pressure vessel in welding equipment 1 before welding;
after the step of SS002 and shaping and the step of SS001, the tail section and the welding section of the pressure vessel are attached into a whole, a circumferential seam to be welded is formed, and the welding equipment 1 adopts a shaping process to carry out rounding shaping on the circumferential seam to be welded;
after the step of SS003 and welding and the step of SS002, the welding equipment 1 polishes the annular seam to be welded after finishing the whole round shaping for the first time, the welding equipment 1 welds the annular seam to be welded after the primary polishing, and the welding equipment 1 polishes the welded ring formed after the welding is completed after the full cooling and solidification of the welded seam;
the welding equipment 1 comprises a welding frame 2, two symmetrically arranged screw rod driving modules a3 are arranged in the welding frame 2, and clamping mechanisms are in transmission connection with the peripheral sides of the two screw rod driving modules a 3;
the surface of the welding frame 2 is respectively provided with a welding and grinding mechanism and a transmission module in transmission connection with two clamping mechanisms, and the surface of one clamping mechanism is fixedly provided with a shaping mechanism.
The fixture comprises a clamping frame 4 which is in sliding connection with the welding frame 2 and is driven by a screw rod driving module a3, the inner wall of the clamping frame 4 is respectively and rotatably connected with a clamping cylinder 5 and a transmission coil 6, the transmission coil 6 is driven by a transmission module, the peripheral side surface of the transmission coil 6 is in transmission connection with the clamping cylinder 5 through a belt, a group of clamping push rods 7 which are distributed in a circumferential array are arranged in the clamping cylinder 5, and arc clamping plates 8 are fixedly arranged at the end parts of each group of clamping push rods 7.
The transmission module comprises a transmission shaft 9 which is horizontally arranged and rotationally connected between the inner surfaces of the welding frames 2 and a transmission motor 35 which is fixed on the side surfaces of the welding frames 2, wherein the output shaft end of the transmission motor 35 is fixedly connected with the transmission shaft 9, the transmission coil 6 is of a hollow tubular structure with two open ends, the inner cavity of the transmission coil 6 is regular polygon, and the cross section of the transmission shaft 9 is matched with the inner cavity of the transmission coil 6.
When in use, the transmission shaft 9 can continuously and effectively transmit the transmission coil 6 in the two clamping mechanisms in the process of changing the positions by arranging the shape of the inner cavity of the transmission coil 6 and arranging the cross section of the transmission shaft 9;
before the pressure vessel is welded, the tail section of the pressure vessel and the welding section of the pressure vessel are respectively fixed in two clamping mechanisms, and during clamping operation, the clamping push rod 7 synchronously works, so that the clamping inner diameter formed by a group of arc clamping plates 8 is changed;
when the pressure vessel is in the welding, polishing or shaping mode, the drive motor 35 drives the two cartridges 5 to rotate synchronously at the same speed.
The shaping mechanism comprises a shaping frame 10, a group of inner supporting frames 11 distributed in a circumferential array and two symmetrically arranged guide seats 12 respectively, the surface of the shaping frame 10 is fixedly connected with a clamping frame 4 in a clamping mechanism, a screw rod transmission module b13 is fixedly arranged in the shaping frame 10, and the peripheral side surface of the screw rod transmission module b13 is in transmission connection with a movable frame 14;
the screw rod driving module a3 and the screw rod transmission module b13 comprise a driving motor and a driving screw rod, the output shaft end of the driving motor is fixedly connected with the driving screw rod, and the axis of the driving screw rod is parallel to the axis of the clamping cylinder 5;
the inner wall of the movable frame 14 is fixedly provided with two symmetrically arranged guide rods 15, the inner wall of the movable frame 14 is rotationally connected with a distance adjusting screw rod 17 driven by an adjusting motor 16, the circumferential side surface of the distance adjusting screw rod 17 is symmetrically provided with a forward thread part and a reverse thread part, and the circumferential side surfaces of the forward thread part and the reverse thread part are respectively in transmission connection with the two guide seats 12;
by the arrangement of the forward thread part and the reverse thread part, the distance between the two guide seats 12 is changed rapidly;
the inner wall of the guide seat 12 is in sliding connection with the guide rods 15, connecting rods 18 are hinged between the inner supporting frame 11 and the opposite surfaces of the two guide seats 12, the inner wall of the inner supporting frame 11 is rotationally connected with a shaping inner roller 19, a vertically arranged pressing push rod 20 is installed in the shaping frame 10, a pressing table 21 is fixedly arranged at the bottom end of the pressing push rod 20, two symmetrically arranged pressing seats 22 are slidingly connected to the inner wall of the pressing table 21, pressure sensors 23 are installed between the pressing table 21 and the opposite surfaces of the two pressing seats 22, and the inner walls of the two pressing seats 22 are rotationally connected with shaping outer rollers 24.
Before welding operation, the tail section and the welding section of the pressure container are attached to form a whole to-be-welded circular seam, after the to-be-welded circular seam is formed, the two screw rod driving modules a3 are matched with the screw rod driving modules b13, so that the to-be-welded circular seam is moved to the center positions of the shaping outer roller 24 and the shaping inner roller 19, after the movement is finished, the distance-adjusting screw rod 17 drives the two guide seats 12 at the same speed, so that the arrangement positions of a group of clamping frames 4 are synchronously changed, the position of the shaping inner roller 19 is changed, after the position of the group of shaping inner roller 19 is adjusted, the surface of the shaping inner roller 19 is fully attached to the inner wall of the pressure container, after the position of the shaping inner roller 19 is adjusted, the driving of the pressing push rod 20 is finished, the two shaping outer rollers 24 are attached to the outer wall of the pressure container, after the pressing is finished, the driving motor 35 drives the two clamping drums 5 at the same speed synchronously, after the clamping drums 5 are rotated, the shaping outer roller 24 and the shaping inner roller 19 are rotated, the circular seam is shaped, the circular seam is formed, and the circular seam to be shaped, and the welding effect is realized through the effect of shaping circular seam is improved.
The welding and grinding mechanism comprises an annular grinding belt 25 and a lifting frame 26 fixedly connected with the welding frame 2, two symmetrically arranged screw rod lifting modules 27 are arranged in the lifting frame 26, the inner walls of the lifting frame 26 are respectively and slidably connected with a grinding frame 28 and a welding table 29, and the inner walls of the grinding frame 28 and the welding table 29 are respectively and drivingly connected with the two screw rod lifting modules 27;
the screw rod lifting module 27 comprises a lifting screw rod which is vertically arranged and rotatably connected to the inner wall of the lifting frame 26 and a lifting motor which is fixed on the surface of the lifting frame 26, and the output shaft end of the lifting motor is in transmission connection with the lifting screw rod;
a welding module is arranged in the welding table 29;
the welding module comprises a welding machine 34 fixed on the surface of the welding frame 2 and a welding gun 33 fixed in the welding table 29, and the port of the welding machine 34 is connected with the welding gun 33 through a cable;
a driving roller 30 and two symmetrically arranged driven rollers 31 are respectively and rotatably connected between the inner surfaces of the polishing frame 28, and the peripheral sides of the driving roller 30 and the two driven rollers 31 are in transmission connection with the annular polishing belt 25;
the driving roller 30 is arranged between two driven rollers 31, the driven rollers 31 are arranged below the driving roller 30, and the axes of the driving roller 30 and the driven rollers 31 are parallel to the axis of the clamping cylinder 5;
a grinding motor 32 is fixedly arranged on the side surface of the grinding frame 28, and the output shaft end of the grinding motor 32 is fixedly connected with the driving roller 30.
After the whole circle is shaped, the polishing motor 32 drives the annular polishing belt 25 to rotate at a set speed, and when the annular polishing belt 25 moves, the surface of the annular polishing belt 25 is clung to a ring seam to be welded after the whole circle is shaped with set pressure, polishing operation is carried out, and the uneven rate of the joint of the tail section and the welding section of the pressure vessel is reduced by the polishing effect, so that the welding precision and the welding effect of the annular welding seam are improved in an auxiliary mode.
To sum up: the beneficial effects of the invention are embodied in that
When the welding machine is used for welding, the transmission motor drives the two clamping cylinders to synchronously rotate at the same speed at a set speed, after the clamping cylinders rotate, the whole circle shaping of the circular seam to be welded is realized through the action of the shaping outer roller and the shaping inner roller, and the welding precision of the circular seam to be welded is effectively improved through the realization of the whole circle shaping effect.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (9)
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| CN202311693561.XA CN117620613A (en) | 2023-12-11 | 2023-12-11 | Pressure vessel welding methods |
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| CN202311693561.XA CN117620613A (en) | 2023-12-11 | 2023-12-11 | Pressure vessel welding methods |
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