CN111069803A - Welding method of lifting tool for lifting pressure vessel top cover seal head and application thereof - Google Patents
Welding method of lifting tool for lifting pressure vessel top cover seal head and application thereof Download PDFInfo
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- CN111069803A CN111069803A CN201911396710.XA CN201911396710A CN111069803A CN 111069803 A CN111069803 A CN 111069803A CN 201911396710 A CN201911396710 A CN 201911396710A CN 111069803 A CN111069803 A CN 111069803A
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- China
- Prior art keywords
- lifting
- welding
- isolation layer
- layer
- top cover
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
Abstract
A welding method of a lifting tool for lifting a top cover head of a pressure vessel and application thereof belong to the lifting technology of the top cover head of the pressure vessel of a nuclear power station reactor, solve the technical problem of lifting the top cover head of the pressure vessel of a marine floating nuclear power station reactor, and comprise the following steps: s1, designing a lifting lug shape structure and determining a lifting lug welding position; s2, overlaying an isolation layer at the welding position of the outer wall of the base metal body; s3, using a handheld electric angle grinder to smoothly grind the outer surface of the isolation layer, and welding a transition layer on the outer surface of the isolation layer after finishing the smooth grinding; s4, nondestructive detection of the hoisting position; and S5, welding a lifting lug. By adopting the welding and lifting process of the special lifting appliance for the head cover end socket, the structure, the number and the position of the lifting lugs are optimized through finite element stress analysis software, so that the welding and lifting process is easy to realize and convenient to operate in actual production, meanwhile, the damage of the head cover end socket in the lifting process is effectively prevented, the manufacturing period is shortened, and the manufacturing cost is saved.
Description
Technical Field
The invention belongs to the technical field of lifting of a top cover and a head of a pressure vessel of a nuclear power station reactor, and particularly relates to a welding method of a lifting tool for lifting the top cover and the head of the pressure vessel and application thereof.
Background
The reactor pressure vessel of the marine floating nuclear power station belongs to key equipment in a primary loop of the marine floating nuclear power station, and the top cover seal head is an important main forging of the reactor pressure vessel. The lifting device is formed by integrally forging equipment, is heavy, has an integral mechanism of a special-shaped structure, and cannot be normally lifted and hoisted in the actual production process.
The shape of the top cover end socket for the reactor pressure vessel of the marine floating nuclear power station is as follows: the spherical top is hemispherical, the size specification is phi 2910/phi 1250 multiplied by 1170mm, 167t steel ingots are adopted for forging, the forging die belongs to an integral special-shaped forging piece of a non-core area, the structure is unique, the height of a flange is close to 650mm, and the thickness is close to 550 mm. During the production, the hoisting and hoisting of a factory, the body can be scratched when the hanging tongs are used, or the hidden quality trouble of small size is generated. Or the lifting is not stably and smoothly fallen to the ground, so that the accident of bumping and smashing the field is generated, in order to ensure the safe and stable lifting of the top cover end socket, an auxiliary tool lifting appliance needs to be welded on the body, and meanwhile, the condition that the performance index of the body cannot be damaged or influenced in the welding process is also considered, so that high requirements on the aspects of technological parameters, methods, material selection and the like of the welding auxiliary tool are provided.
Disclosure of Invention
The invention of the invention is: the invention provides a welding method of a lifting tool for lifting a top cover head of a pressure vessel and application thereof, aiming at overcoming the defects of the prior art and solving the technical problem of lifting the top cover head (non-core area integral special-shaped forging) of the pressure vessel of a reactor of a marine floating nuclear power station.
The invention is realized by the following technical scheme.
The method for welding the lifting tool for lifting the top cover head of the pressure vessel carries out detailed process analysis and research on the process and the effect of the welding auxiliary tool, designs and welds the special lifting auxiliary tool for the top cover head on the basis, and comprises the following steps:
s1, designing a lifting lug shape structure and determining a lifting lug welding position: lifting lug welding stations are symmetrically arranged at two ends of the diameter of the cylindrical flange connecting part of the base metal body, two lifting lugs are oppositely welded at each lifting lug welding station, each lifting lug is integrally manufactured and formed, splicing, assembling and welding are not allowed, a circular lug hole is formed in each lifting lug, and the lug holes are formed in an integral boring mode;
s2, surfacing an isolating layer at the welding position of the outer wall of the base material body: overlaying an isolation layer at a lifting lug welding station on the outer wall of the parent metal body by adopting a transverse welding method, polishing the outer end surface of the isolation layer to be smooth and flat, so that the outer end surface of the polished isolation layer is a vertical surface, the thickness of the isolation layer is 10-15mm, the unevenness of the outer surface of the isolation layer is controlled to be less than or equal to 1mm, the included angle between the minimum thickness position of the isolation layer and the upper edge of the outer end surface of the isolation layer is 65-71 degrees, and the included angle between the minimum thickness position of the isolation layer and the lower edge of the outer end surface of the isolation layer;
s3, smoothly polishing the outer end face of the isolation layer and four surfaces around the outer end face by using a handheld electric angle grinder, welding a transition layer on the outer surface of the isolation layer after finishing the smooth polishing, controlling the unevenness of the transition layer to be less than or equal to 1mm, and polishing for multiple times by using the electric angle grinder when the unevenness does not meet the requirement until the thickness of the transition layer after polishing is 10-15 mm;
s4, nondestructive testing of the hoisting position: carrying out nondestructive testing on the isolation layer, the transition layer and the base material body at the hoisting position by adopting a magnetic powder detection method;
s5, lug welding: the lifting lugs are welded at the corresponding positions of the isolating layers by adopting a vertical welding method, and the included angle between the central line of the lifting lugs and the outer wall of the parent metal body after vertical welding is 64-70 degrees.
Furthermore, the lifting lug is made of carbon structural steel.
Furthermore, the upper edge of the isolation layer is in arc transition connection with the surface of the base material body, and the lower edge of the isolation layer is in linear transition connection with the surface of the base material body
Furthermore, the included angle between the chord length of the arc transition connection of the upper edge of the isolation layer and the surface of the base material body is larger than the included angle between the lower edge of the isolation layer and the surface of the base material body.
The application of the lifting tool for lifting the top cover and the end socket of the pressure vessel comprises the following steps:
s1, respectively penetrating two lifting lugs at each lifting lug welding station by using two steel wire ropes;
s2, connecting the two steel wire ropes with a main hook of the traveling crane respectively;
s3, after the two steel wire ropes are connected, the crane slowly rises to hook, the steel wire ropes are vertically lifted, when the lower end face of the base metal body is lifted 50-100mm away from the supporting bracket, deformation of a lifting appliance and lifting lugs is checked in a visual inspection mode, and after the base metal body is suspended and is static for no abnormality after minutes, the base metal body is lifted in place in normal operation.
Compared with the prior art, the invention has the beneficial effects that:
in the processes of processing, nondestructive testing and performance heat treatment of the head cover seal head, the welding and hoisting process of the special lifting appliance for the head cover seal head is adopted, and the structure, the number and the position of the lifting lugs are optimized through finite element stress analysis software, so that the special lifting appliance for the head cover seal head is easy to realize in actual production and convenient to operate, and meanwhile, the head cover seal head is effectively prevented from being damaged in the hoisting process, the manufacturing period is shortened, and the manufacturing cost is saved.
Drawings
Fig. 1 is a schematic view of the overall structure of the lifting appliance tooling of the invention.
Fig. 2 is a schematic view of the whole structure of the hanger tool in use state.
Fig. 3 is a schematic diagram of the effect of the lifting lug after welding.
In the figure, 1 is a base material body, 2 is an isolating layer, 3 is a surfacing layer, 4 is a lifting lug, 5 is a steel wire rope, 6 is a crane main hook, and 7 is a crane.
Detailed Description
The invention is described in further detail below with reference to the figures and examples.
As shown in fig. 1 to 3, the method for welding the lifting tool for lifting the top cover head of the pressure vessel performs detailed process analysis and research on the process and effect of the welding auxiliary tool, and designs and welds the lifting auxiliary tool special for the top cover head on the basis, and comprises the following steps:
s1, designing the shape structure of the lifting lug 4 and determining the welding position of the lifting lug 4: lifting lug welding stations are symmetrically arranged at two ends of the diameter of the cylindrical flange connecting part of the base metal body 1, two lifting lugs 4 are oppositely welded at each lifting lug welding station, each lifting lug 4 is integrally manufactured and formed, splicing, assembling and welding are not allowed, a circular lug hole is formed in each lifting lug 4, and the lug holes are formed in an integral boring mode;
s2, surfacing the isolation layer 2 at the welding position of the outer wall of the base material body 1: overlaying an isolation layer 2 at a lifting lug welding station on the outer wall of a parent metal body 1 by adopting a transverse welding method, polishing the outer side end face of the isolation layer 2 smoothly and flatly, so that the outer side end face of the isolation layer 2 after polishing is a vertical face, the thickness of the isolation layer 2 is 10-15mm, the unevenness of the outer surface of the isolation layer 2 is controlled to be less than or equal to 1mm, the included angle between the position with the minimum thickness of the isolation layer 2 and the upper edge of the outer side end face of the isolation layer 2 is 65-71 degrees, and the included angle between the position with the minimum thickness of the isolation layer 2 and the lower edge of the outer side end face of;
s3, smoothly polishing the outer end face of the isolation layer 2 and four surfaces around the outer end face by using a handheld electric angle grinder, welding a transition layer 3 on the outer surface of the isolation layer 2 after finishing, controlling the unevenness of the transition layer 3 to be less than or equal to 1mm, and polishing for multiple times by using the electric angle grinder when the unevenness does not meet the requirement until the thickness of the transition layer 3 after polishing is 10-15 mm;
s4, nondestructive testing of the hoisting position: carrying out nondestructive testing on the isolation layer 2, the transition layer 3 and the base material body 1 at the hoisting position by adopting a magnetic powder detection method;
s5, lug welding: the lifting lug 4 is welded at the corresponding position of the isolation layer 2 by adopting a vertical welding method, and the included angle between the central line of the lifting lug 4 after vertical welding and the outer wall of the parent metal body 1 is 64-70 degrees.
Further, the lifting lug 4 is made of carbon structural steel.
Furthermore, the upper edge of the isolation layer 2 is in arc transition connection with the surface of the base material body 1, and the lower edge of the isolation layer 2 is in linear transition connection with the surface of the base material body 1
Furthermore, the included angle between the chord length of the arc transition connection of the upper edge of the isolation layer 2 and the surface of the base material body 1 is larger than the included angle between the lower edge of the isolation layer 2 and the surface of the base material body 1.
The application of the lifting tool for lifting the top cover and the end socket of the pressure vessel comprises the following steps:
s1, respectively penetrating two lifting lugs 4 at each lifting lug welding station by using two steel wire ropes 5;
s2, connecting the two steel wire ropes 5 with the traveling crane main hook 6 respectively;
s3, after the two steel wire ropes 5 are connected, the crane 7 slowly rises to hook, the steel wire ropes 5 vertically lift, when the lower end face of the base material body 1 is lifted 50-100mm away from the supporting bracket, deformation of the lifting appliance and the lifting lugs 4 is checked in a visual inspection mode, and after the base material body 1 is suspended and static for 5 minutes without abnormal conditions, the base material body 1 is lifted in place in normal operation.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. The welding method of the lifting tool for lifting the top cover and the end socket of the pressure vessel is characterized by comprising the following steps of:
s1, designing the shape and structure of the lifting lug (4) and determining the welding position of the lifting lug (4): lifting lug welding stations are symmetrically arranged at two ends of the diameter of the cylindrical flange connecting part of the base metal body (1), two lifting lugs (4) are welded at each lifting lug welding station, each lifting lug (4) is integrally manufactured and formed, splicing, assembly and welding are not allowed, a circular lug hole is formed in each lifting lug (4), and the lug holes are formed in an integral boring mode;
s2, surfacing the isolation layer (2) at the welding position of the outer wall of the base material body (1): overlaying an isolating layer (2) at a lifting lug welding station on the outer wall of a parent metal body (1) by adopting a transverse welding method, polishing the outer side end face of the isolating layer (2) to be smooth and flat, enabling the outer side end face of the polished isolating layer (2) to be a vertical face, enabling the thickness of the isolating layer (2) to be 10-15mm, controlling the unevenness of the outer surface of the isolating layer (2) to be less than or equal to 1mm, enabling the included angle between the minimum thickness position of the isolating layer (2) and the upper edge of the outer side end face of the isolating layer (2) to be 65-71 degrees, and enabling the included angle between the minimum thickness position of the isolating layer (2) and the lower edge of the outer side end face;
s3, smoothly polishing the outer end face of the isolation layer (2) and four surfaces around the outer end face by using a handheld electric angle grinder, welding a transition layer (3) on the outer surface of the isolation layer (2) after the smooth polishing is finished, controlling the unevenness of the transition layer (3) to be less than or equal to 1mm, and polishing the transition layer (3) for multiple times by using the electric angle grinder when the unevenness does not meet the requirement until the thickness of the transition layer (3) is 10-15mm after polishing;
s4, nondestructive testing of the hoisting position: carrying out nondestructive testing on the isolation layer (2), the transition layer (3) and the base material body (1) at the hoisting position by adopting a magnetic powder detection method;
s5, lug welding: the lifting lugs (4) are welded at the corresponding positions of the isolating layer (2) by adopting a vertical welding method, and the included angle between the central line of the lifting lugs (4) after vertical welding and the outer wall of the base metal body (1) is 64-70 degrees.
2. The welding method of the lifting tool for lifting the top cover and the end enclosure of the pressure vessel as claimed in claim 1, wherein the welding method comprises the following steps: the lifting lug (4) is made of carbon structural steel.
3. The welding method of the lifting tool for lifting the top cover and the end enclosure of the pressure vessel as claimed in claim 1, wherein the welding method comprises the following steps: the upper edge of the isolation layer (2) is in arc transition connection with the surface of the base material body (1), and the lower edge of the isolation layer (2) is in linear transition connection with the surface of the base material body (1).
4. The welding method of the lifting tool for lifting the top cover and the end enclosure of the pressure vessel as claimed in claim 3, wherein the welding method comprises the following steps: the included angle between the chord length of the arc transition connection of the upper edge of the isolation layer (2) and the surface of the base material body (1) is larger than the included angle between the lower edge of the isolation layer (2) and the surface of the base material body (1).
5. The application of the lifting tool for lifting the top cover and the end socket of the pressure vessel as claimed in claim 1 is characterized by comprising the following steps:
s1, respectively penetrating two lifting lugs (4) at each lifting lug welding station by using two steel wire ropes (5);
s2, connecting the two steel wire ropes (5) with the main hook (6) of the traveling crane respectively;
s3, after the two steel wire ropes (5) are connected, the crane (7) slowly lifts up the hook, the steel wire ropes (5) are vertically lifted, when the lower end face of the base metal body (1) is lifted 50-100mm away from the supporting bracket, deformation of a lifting appliance and a lifting lug (4) is checked in a visual inspection mode, and after the base metal body (1) is suspended and kept static for 5 minutes without abnormity, the base metal body (1) is lifted in place in normal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911396710.XA CN111069803A (en) | 2019-12-30 | 2019-12-30 | Welding method of lifting tool for lifting pressure vessel top cover seal head and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911396710.XA CN111069803A (en) | 2019-12-30 | 2019-12-30 | Welding method of lifting tool for lifting pressure vessel top cover seal head and application thereof |
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|---|---|
| CN111069803A true CN111069803A (en) | 2020-04-28 |
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| CN201911396710.XA Pending CN111069803A (en) | 2019-12-30 | 2019-12-30 | Welding method of lifting tool for lifting pressure vessel top cover seal head and application thereof |
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| CN (1) | CN111069803A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535898A (en) * | 2022-01-20 | 2022-05-27 | 长春一汽蓝迪自动化工程有限公司 | Novel method for manufacturing lifting appliance |
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Application publication date: 20200428 |