CN110484709B - Method for eliminating welding stress of sealing cylinder in nuclear reactor - Google Patents
Method for eliminating welding stress of sealing cylinder in nuclear reactor Download PDFInfo
- Publication number
- CN110484709B CN110484709B CN201910722565.3A CN201910722565A CN110484709B CN 110484709 B CN110484709 B CN 110484709B CN 201910722565 A CN201910722565 A CN 201910722565A CN 110484709 B CN110484709 B CN 110484709B
- Authority
- CN
- China
- Prior art keywords
- magnetic
- sealing cylinder
- blank
- heat treatment
- magnetic conduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a method for eliminating welding stress of a sealing cylinder in a nuclear reactor, wherein the sealing cylinder comprises a non-magnetic conducting pipe and a magnetic pipe, the magnetic pipe is a circular ring-shaped welding part formed by alternately welding magnetic conducting rods and non-magnetic conducting rods with the same shape, and the cross sections of the magnetic conducting rods and the non-magnetic conducting rods are both trapezoidal; the material of the non-magnetic conduction rod in the non-magnetic conduction pipe and the magnetic pipe is 1Cr18Ni10Ti, the material of the magnetic conduction rod in the magnetic pipe is 0Cr13, the welded sealing cylinder blank and the tool positioned at the core part of the sealing cylinder blank are placed in a heat treatment furnace together for heat treatment, and the heat treatment process comprises the following steps: and firstly heating to 300-500 ℃, preserving heat for 0.5-1 h, carrying out temperature equalization treatment, then heating to 600-720 ℃, preserving heat for 1-4 h, then cooling to room temperature, taking out the tooling and processing to obtain the sealed cylinder for eliminating stress. The sealing cylinder blank and the tool are subjected to heat treatment together, so that the integral flatness and coaxiality of the sealing cylinder are kept. The method not only ensures the low magnetism of the non-magnetic conducting rod, but also has good mechanical properties of the joint and the parent metal.
Description
Technical Field
The invention relates to the field of metal heat treatment, in particular to a method for eliminating welding stress of a sealing cylinder in a nuclear reactor.
Background
The novel sealing cylinder (hereinafter referred to as sealing cylinder, as shown in fig. 1) in the nuclear reactor comprises a non-magnetic conduction pipe and a magnetic pipe fixedly connected with the non-magnetic conduction pipe, wherein the magnetic pipe is manufactured by alternately welding 8 magnetic conduction rods and 8 non-magnetic conduction rods. In consideration of the particularity of the use of the sealing cylinder in the nuclear reactor, in the prior art, the materials of 8 non-magnetic rods in the non-magnetic tubes and the magnetic tubes are all solid solution state 1Cr18Ni10Ti (the solid solution state 1Cr18Ni10Ti meets the mechanical property requirement of the sealing cylinder in the process of applying the sealing cylinder to the nuclear reactor), and the 1Cr18Ni10Ti is austenitic stainless steel which has weak magnetism; the material of 8 magnetic conduction rods in the magnetic tube is 0Cr13, and 0Cr13 belongs to stainless steel capable of magnetic conduction (ferrite stainless steel or martensite stainless steel finally according to the preparation process). The sealing cylinder realizes the magnetic circuit design of a driving motor by alternately welding the magnetic conduction rods and the non-magnetic conduction rods, controls the fuel rods of the nuclear reactor to start and stop, but has the problems of deformation, heating and the like in the use process due to the large residual stress after welding, causes great potential safety hazard to the service process of the nuclear reactor, and needs to take measures to reduce the residual stress of the sealing cylinder structure in order to ensure the quality of the sealing cylinder.
The method for eliminating the residual stress of the welded joint mainly comprises the following welding rolling, vibration aging, local heating, integral heat treatment and the like. Limited by the form of the annular structure, the welding residual stress is difficult to eliminate by using a method of welding rolling and vibration aging; because the sealing cylinder is provided with the annular seam and the longitudinal seam, the structure is complex, and the distance of each welding seam is small, so that the operation difficulty is high by adopting a method of locally heating to relieve stress. The whole heat treatment after welding can greatly reduce the welding residual stress, and is a feasible method for eliminating the stress of the sealing cylinder, but the actual effect of the stress elimination heat treatment depends on the type of the material, the heat preservation temperature, the heat preservation time and the like, and the stress elimination heat treatment can possibly influence the service performance of the material, especially can possibly cause the magnetic conductivity of the non-magnetic conducting rod to be increased, so that a reasonable and effective stress elimination heat treatment method needs to be made, and the welding joint stress and the substrate residual stress of a dissimilar steel sealing cylinder structure are eliminated on the premise of ensuring that the weak magnetism of the non-magnetic conducting rod cannot be obviously changed.
Generally speaking, the optimal heat treatment process for eliminating welding residual stress of the austenitic stainless steel material is to slowly cool the austenitic stainless steel material after heat preservation at 850-1050 ℃, but the magnetic conductivity of the austenitic stainless steel material is seriously increased in the temperature range, namely, the magnetic conductivity of the non-magnetic rod is obviously improved, and the use effect of the sealing cylinder is influenced; in addition, since the 0Cr13 steel is generally supplied in an annealed state below 900 ℃, the elimination of residual stress within the temperature range of 850 ℃ to 1050 ℃ will seriously affect the conventional performance of the 0Cr13 steel. In order to make the 1Cr18Ni10Ti austenitic stainless steel and the mechanical properties of the joint thereof compatible, medium temperature tempering heat treatment can be adopted, but the method can not ensure the magnetic permeability of the 1Cr18Ni10Ti austenitic stainless steel and the mechanical properties of the 1Cr18Ni10Ti +0Cr13 dissimilar steel joint, and the stress relief effect can not be ensured.
Therefore, a method for eliminating the welding stress of the sealing cylinder in the nuclear reactor is needed, and the weak magnetism of the non-magnetic rod can be ensured while the stress is eliminated, so that the using effect of the sealing cylinder is ensured.
Disclosure of Invention
In view of the above, the present invention provides a method for eliminating welding stress of a sealing cylinder in a nuclear reactor, which can ensure weak magnetism of a non-magnetic conducting rod while eliminating residual stress in the sealing cylinder.
The technical scheme adopted by the invention to solve the technical problems is as follows:
a method for eliminating welding stress of a sealing cylinder in a nuclear reactor comprises the steps that the sealing cylinder comprises a non-magnetic conduction pipe and a magnetic pipe fixedly connected with the end part of the non-magnetic conduction pipe, the magnetic pipe is a circular ring-shaped welding part formed by alternately welding magnetic conduction rods and non-magnetic conduction rods with the same shape, and the sections of the magnetic conduction rods and the non-magnetic conduction rods are both trapezoidal; the material of the non-magnetic conduction rod in the non-magnetic conduction pipe and the magnetic pipe is solid solution state 1Cr18Ni10Ti, the material of the magnetic conduction rod in the magnetic pipe is 0Cr13, the welded sealing cylinder blank and the tool positioned at the core part of the sealing cylinder blank are placed in a heat treatment furnace together for heat treatment, and the heat treatment process comprises the following steps: and firstly heating to 300-500 ℃, preserving heat for 0.5-1 h, carrying out temperature equalization treatment, then heating to 600-720 ℃, preserving heat for 1-4 h, then cooling to room temperature, taking out the tooling and processing to obtain the sealed cylinder for eliminating stress.
Furthermore, the heating rate in the heat treatment process is less than or equal to 400 ℃/h.
Further, the cooling to room temperature in the heat treatment process comprises the following steps: firstly, cooling the sealing cylinder blank and the tool to 200 ℃ along with the furnace, and then discharging and cooling to room temperature.
Further, the cooling rate of the sealing cylinder blank and the tool along with furnace cooling is less than or equal to 100 ℃/h.
Further, the sealing cylinder blank and the tool are subjected to preheating treatment before being subjected to heat treatment, wherein the preheating temperature is less than or equal to 300 ℃, and then the temperature equalization treatment is performed.
Further, the manufacturing process of the sealing cylinder blank comprises the following steps: firstly, placing a non-magnetic conductive pipe and a magnetic pipe into corresponding positions of a tool for welding and forming a magnetic conductive strip-shaped blank and a non-magnetic conductive strip-shaped blank, and welding the magnetic conductive strip-shaped blank and the non-magnetic conductive strip-shaped blank into a whole to obtain a sealing cylinder blank, wherein the magnetic conductive strip-shaped blank is made of 0Cr13, and the non-magnetic conductive strip-shaped blank is made of solid solution state 1Cr18Ni10 Ti.
Furthermore, the magnetic conduction strip-shaped blank not only comprises a main body part with a trapezoidal section and the shape of which is consistent with that of the non-magnetic conduction strip-shaped blank, but also comprises an auxiliary part with a rectangular section, wherein the auxiliary part is fixedly connected with the short edge of the two parallel sides of the main body part; the tool is a cylinder matched with the inner diameter of the sealing cylinder, grooves are annularly and symmetrically distributed on the surface of the tool matched with the inner diameter of the magnetic pipe, the number and the extending direction of the grooves are consistent with those of the magnetic conduction strip-shaped blanks, the grooves are matched with the auxiliary parts of the magnetic conduction strip-shaped blanks, the auxiliary parts of the magnetic conduction strip-shaped blanks are placed in the grooves of the tool to realize the positioning of the magnetic conduction strip-shaped blanks, the size of the non-magnetic conduction strip-shaped blanks is matched with the space between every two adjacent magnetic conduction strip-shaped blanks, and the non-magnetic conduction strip-shaped blanks are; and sleeving the non-magnetic conductive pipe at the corresponding position of the tool, and welding the magnetic conductive strip-shaped blank, the non-magnetic conductive strip-shaped blank and the non-magnetic conductive pipe into a whole to obtain a sealing cylinder blank.
Further, the tool is made of carbon steel.
The primary principle of the heat treatment process design is to obtain good joint stress relief effect and stable weak magnetic property of the non-magnetic conductive rod, and the mechanical properties of the joint and the parent metal are not remarkably deteriorated as far as possible under the premise.
The primary principle of the design of the heat treatment tool is to adapt to the size of the sealing cylinder and ensure that the straightness and the coaxiality of the sealing cylinder can be ensured in each process.
Has the advantages that:
as described above, the method for eliminating the welding stress of the sealing cylinder in the nuclear reactor of the invention has the following beneficial effects:
1. the sealing cylinder blank and the tool are placed in a heat treatment furnace together for heat treatment, so that the whole straightness and coaxiality of the sealing cylinder are kept. The heat treatment process is beneficial to ensuring the low magnetism of the 1Cr18Ni10Ti steel, the stress relaxation effect of more than 90 percent can be obtained, and the mechanical properties of the joint and the parent metal are good.
2. The temperature range and the heat preservation time of stress relief treatment in the heat treatment process are (600-720) DEG C x (1-4) h, the heat treatment has certain promotion effect on the decomposition of ferrite in 1Cr18Ni10Ti in the temperature range and the heat preservation time range, the austenite crystal boundary is not strongly sensitized, the low magnetism is ensured, the stress relaxation effect of more than 90 percent can be obtained, and the mechanical properties of the joint and the parent metal are good. If the heat preservation time and the heat preservation temperature are not enough, the stress relief effect is poor, and if the heat preservation temperature is too high or/and the heat preservation time is too long, the stress relief effect of the joint cannot be obviously improved, the risk of austenite grain boundary sensitization can be increased, and energy is wasted;
3. the temperature equalizing process in the heat treatment process is (300-500) DEG C (x) (0.5-1) h, the temperature stress accumulated in the member in the temperature range is not large, the stress can be better eliminated after the heat preservation is carried out for (0.5-1) h, the structure of the material is stable, and the use performance cannot be changed to a poor direction.
4. The temperature rising speed is less than or equal to 400 ℃/h and the temperature reducing speed is less than or equal to 100 ℃/h in the heat treatment process. The temperature rising speed is determined by comprehensively considering the actual heating capacity and the material heat conductivity coefficient of the heat treatment furnace, and the temperature lowering speed is determined for ensuring the good stress relief effect of the welding joint.
5. The heat conductivity of the 0Cr13 steel is superior to that of the 1Cr18Ni10Ti steel, the thickness of the magnetic conduction strip blank made of 0Cr13 is obviously thicker than that of the magnetic conduction strip blank made of 1Cr18Ni10Ti, and the temperature difference between the magnetic conduction strip blank and the magnetic conduction strip blank can be reduced in the heat treatment process on the basis of being adaptive to a tool.
6. The tool is made of carbon steel, and the high-temperature strength of the carbon steel is lower than that of 1Cr18Ni10Ti and 0Cr13, so that the tool can provide necessary rigidity without generating additional stress on the sealing cylinder, the cost of the tool is low, the processing is easy, and the tool can be used repeatedly.
The present invention will be described in further detail with reference to the drawings and specific examples.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic view of the sealing cartridge of the present invention after being processed to a design size.
Fig. 2 is a schematic view of the tooling of the present invention.
Fig. 3 is a schematic diagram of the assembled magnetic conductive strip-shaped blank, non-magnetic conductive strip-shaped blank and tool.
Fig. 4 is a residual stress measurement of the sealed cylinder before and after heat treatment.
Fig. 5 is a measurement result of mechanical properties of the sealing cylinder before and after heat treatment.
The figure shows the mark, 1, non-magnetic conductive tube, 2, magnetic tube, 201, non-magnetic conductive bar, 202, magnetic conductive bar.
Detailed Description
The core of the invention is to provide a method for eliminating welding stress of a sealing cylinder in a nuclear reactor, which can ensure weak magnetism of a non-magnetic rod while eliminating residual stress in the sealing cylinder.
Referring to fig. 1, fig. 1 is a schematic view of a sealing cylinder provided in the present invention after being processed to a designed size. The sealing cylinder comprises a non-magnetic pipe 1 and magnetic pipes 2 fixedly connected with the end parts of the non-magnetic pipe, and the number of the magnetic pipes 2 is one or two. The magnetic tube 2 is a circular ring-shaped welding part formed by alternately welding magnetic conduction rods 202 and non-magnetic conduction rods 201 which are consistent in shape, and the sections of the magnetic conduction rods 202 and the non-magnetic conduction rods 201 are both trapezoidal. The materials of the non-magnetic conducting rods in the non-magnetic conducting tube 1 and the magnetic tube 2 are all solid solution state 1Cr18Ni10 Ti; the material of the magnetic conduction rod in the magnetic tube 2 is 0Cr 13.
It should be noted that the sealing cylinder 2 includes not only welding of dissimilar materials (magnetic conducting rod and non-magnetic conducting rod), but also welding of the same materials (non-magnetic conducting rod and non-magnetic conducting tube).
The stress relieving method is realized by means of a tool, please refer to fig. 2, and fig. 2 is a schematic diagram of the tool in the present invention. The length of frock is unanimous with the length of sealed section of thick bamboo, and the frock includes two parts, and partly is the cylinder of the internal diameter assorted surface area recess with magnetic tube 2, and partly is the cylinder (can all with the hollow solid of cylinder assorted with non-magnetic tube) of internal diameter assorted with non-magnetic tube 1.
The tool is made of carbon steel, and the high-temperature strength of the carbon steel is lower than that of 1Cr18Ni10Ti and 0Cr13, so that the tool can provide necessary rigidity without generating additional stress on the sealing cylinder, the cost of the tool is low, the processing is easy, and the tool can be used repeatedly.
Referring to fig. 3, fig. 3 is a schematic view of the assembled magnetic conductive strip-shaped blank and non-magnetic conductive strip-shaped blank and tooling provided by the present invention. The magnetic conduction strip-shaped blank for forming the magnetic tube not only comprises a main body part with a trapezoidal section and the shape of which is consistent with that of the non-magnetic conduction strip-shaped blank, but also comprises an auxiliary part with a rectangular section, wherein the auxiliary part is fixedly connected with the short edge of two parallel sides of the main body part; the end parts of the long edges in the two parallel edges of the magnetic conduction strip-shaped blank and the non-magnetic conduction strip-shaped blank are provided with steps convenient to weld.
The tool is a cylinder matched with the inner diameter of the sealing cylinder, grooves are annularly and symmetrically distributed on the surface of the cylinder matched with the inner diameter of the magnetic pipe, the number and the extending direction of the grooves are consistent with those of the magnetic conduction strip-shaped blanks, the grooves are matched with the auxiliary parts of the magnetic conduction strip-shaped blanks, the auxiliary parts of the magnetic conduction strip-shaped blanks are arranged in the grooves of the tool, the size of the non-magnetic conduction strip-shaped blanks is matched with the space between every two adjacent magnetic conduction strip-shaped blanks, and the non-magnetic conduction strip-shaped blanks are arranged between every two adjacent; and welding the magnetic conduction strip-shaped blank and the non-magnetic conduction strip-shaped blank into a whole to obtain a sealing cylinder blank. The material of the magnetic conductive strip-shaped material was 0Cr13, and the material of the non-magnetic conductive strip-shaped material was 1Cr18Ni10Ti in a solid solution state.
Placing the sealing cylinder blank and the tool into a heat treatment furnace together for heat treatment so as to eliminate stress in the sealing cylinder blank; the heat treatment process comprises the following steps: raising the temperature to 300-500 ℃ at a heating rate of less than or equal to 400 ℃/h, preserving the temperature for 0.5-1 h, carrying out temperature equalization treatment, raising the temperature to 600-720 ℃ at a heating rate of less than or equal to 400 ℃/h, preserving the temperature for 1-4 h, cooling to 200 ℃ along with the furnace at a cooling rate of less than or equal to 100 ℃/h, discharging and cooling to room temperature, thus obtaining the sealed cylinder to be processed.
Optionally, the sealing cylinder blank and the tool are placed in a box-type air electric furnace together for heat treatment, and the bottom of the sealing cylinder blank is leveled by a cushion block with the height not less than 50mm, so that the sealing cylinder blank is uniformly and completely heated.
And taking out the tool from the sealing cylinder to be processed, and processing the sealing cylinder to be processed to a designed size to obtain the stress-relieved sealing cylinder.
Optionally, the sealing cylinder blank is subjected to preheating treatment at the preheating temperature of less than or equal to 300 ℃ before being subjected to heat treatment together with the tool, and then is subjected to temperature equalization treatment.
Example 1
Installing a magnetic conduction strip-shaped blank and a non-magnetic conduction strip-shaped blank for welding the non-magnetic conduction tube 1 and the magnetic tube 2 at corresponding positions of a tool, and welding the magnetic conduction strip-shaped blank and the non-magnetic conduction strip-shaped blank into a whole to obtain a sealing cylinder blank; then the sealing cylinder blank and the tool are placed in a heat treatment furnace together for heat treatment so as to eliminate the stress in the sealing cylinder blank; the heat treatment process comprises the following steps: placing the sealing cylinder blank and the tool in a heat treatment furnace, heating to 300-500 ℃ at a heating rate of less than or equal to 400 ℃/h, preserving heat for 0.5-1 h, carrying out temperature equalization treatment, heating to 650 ℃ at a heating rate of less than or equal to 400 ℃/h, preserving heat for 1h, cooling to 200 ℃ along with the furnace at a cooling rate of less than or equal to 100 ℃/h, discharging and cooling to room temperature to obtain a sealing cylinder to be processed; and finally, taking the tool out of the sealing cylinder to be processed, and processing the sealing cylinder to be processed to a designed size to obtain the stress-relieved sealing cylinder.
Example 2
Example 2 differs from example 1 in its heat treatment process: then the temperature is raised to 650 ℃ at the temperature raising rate of less than or equal to 400 ℃/h and is kept for 4 h. The rest of the procedure was the same as in example 1.
Supplementary examples
The sealing cylinder of the supplementary example is made of non-magnetic conducting bars only (in order to verify the effect of the stress eliminating method), and the sealing cylinder blank is welded by the non-magnetic conducting bars; then the sealing cylinder blank and the tool are placed in a heat treatment furnace together for heat treatment so as to eliminate the stress in the blank; the heat treatment process comprises the following steps: placing the sealing cylinder blank and the tool in a heat treatment furnace, heating to 300-500 ℃ at a heating rate of less than or equal to 400 ℃/h, preserving heat for 0.5-1 h, carrying out temperature equalization treatment, heating to 650 ℃ at a heating rate of less than or equal to 400 ℃/h, preserving heat for 1h, cooling to 200 ℃ along with the furnace at a cooling rate of less than or equal to 100 ℃/h, and taking out of the furnace and cooling to room temperature; and finally, taking the tool out of the sealing cylinder blank.
Effects of the embodiment
(1) Residual stress test of examples 1-2 and supplementary examples
It should be noted that, because of the narrow width of the weld, the residual stress tested in the present invention is the residual stress of the substrate adjacent to the weld joint. The residual stress of the base body of the sealing cylinder blank adjacent to the welded joint was measured before the heat treatment, and the residual stress at the same position was measured after the heat treatment, and the measurement results are shown in fig. 4.
As can be seen from fig. 4, the residual stress of the sealing cylinder after the heat treatment is significantly reduced compared to the residual stress of the sealing cylinder measured before the heat treatment. Examples 1-2 show that this stress relieving method has a good stress relieving effect when welding the same material (non-magnetic bar and non-magnetic tube) or the different material (magnetic bar and non-magnetic bar/non-magnetic tube), and supplementary examples also show that this stress relieving method can also well relieve stress when welding the same material (non-magnetic bar and non-magnetic bar).
(2) Magnetic permeability test of the substrate on the non-magnetic-conductive rod side (i.e., 1Cr18Ni10Ti side) of examples 1-2 and supplementary examples, and mechanical property test of both sides of the magnetic conductive rod and the non-magnetic-conductive rod of examples 1-2
Before heat treatment, the magnetic permeability of the substrate at the non-magnetic bar side, the mechanical properties of the magnetic bar and the two sides of the non-magnetic bar are measured, and after heat treatment, the magnetic permeability and the mechanical properties at the same position are measured, and the measurement result is shown in fig. 5.
As is clear from FIG. 5, the magnetic permeability of the non-magnetic rod side substrates before and after the heat treatment in examples 1-2 did not change much. And the mechanical property of the matrix after heat treatment is not lower than that before heat treatment, thus meeting the use requirement of the sealing cylinder weldment. And supplementary examples also show that the strength of the welded non-magnetic conducting rod and non-magnetic conducting rod (1 Cr18Ni10Ti and 1Cr18Ni10 Ti) is basically unchanged, and the method for eliminating stress can also ensure the weak magnetic performance of the material.
Therefore, when the method for eliminating the stress is used for eliminating the residual stress of the sealing cylinder, the residual stress of the joint after heat treatment is low, and the use requirement can be met. And the weak magnetism of the non-magnetic rod and the mechanical property of the sealing cylinder can be ensured while the residual stress in the sealing cylinder is eliminated.
It should be noted that the method of relieving stress in the present invention is applicable not only to the sealing cylinder but also to the welding member having a structure similar to that of the sealing cylinder.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The method for eliminating the welding stress of the sealing cylinder in the nuclear reactor provided by the invention is described in detail, and the principle and the specific implementation mode of the invention are explained by applying specific examples, and the examples are only used for helping to understand the method and the core idea of the invention. It should be noted that any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the protective scope of the present invention to those skilled in the art.
Claims (7)
1. A method for eliminating welding stress of a sealing cylinder in a nuclear reactor comprises a non-magnetic conducting pipe (1) and a magnetic pipe (2) fixedly connected with the end part of the non-magnetic conducting pipe (1), wherein the magnetic pipe (2) is a circular ring-shaped welding part formed by alternately welding magnetic conducting rods (202) and non-magnetic conducting rods (201) which are consistent in shape, and the sections of the magnetic conducting rods (202) and the non-magnetic conducting rods (201) are trapezoidal; the material of the non-magnetic conducting rod in the non-magnetic conducting pipe (1) and the material of the non-magnetic conducting rod in the magnetic pipe (2) are both solid solution state 1Cr18Ni10Ti, the material of the magnetic conducting rod in the magnetic pipe (2) is 0Cr13, and the magnetic pipe is characterized in that: the welded sealing cylinder blank and a tool positioned at the core part of the sealing cylinder blank are placed in a heat treatment furnace together for heat treatment, and the heat treatment process comprises the following steps: and firstly heating to 300-500 ℃, preserving heat for 0.5-1 h, carrying out temperature equalization treatment, then heating to 600-720 ℃, preserving heat for 1-4 h, then cooling to room temperature, taking out the tooling and processing to obtain the sealed cylinder for eliminating stress.
2. The method of claim 1, wherein the rate of temperature increase in the heat treatment process is no greater than 400 ℃/h.
3. The method for eliminating the welding stress of the sealing cylinder in the nuclear reactor according to claim 1, wherein the cooling to the room temperature in the heat treatment process comprises the following steps: firstly, cooling the sealing cylinder blank and the tool to 200 ℃ along with the furnace, and then discharging and cooling to room temperature.
4. The method of claim 3, wherein the cooling rate of the seal cartridge blank together with the tooling along with the furnace cooling is less than or equal to 100 ℃/h.
5. The method of claim 1, wherein the preheating is performed at a temperature of 300 ℃ or less before the heat treatment of the seal barrel blank and the tool, and then the temperature equalization is performed.
6. The method of relieving welding stress of a nuclear reactor internal seal cartridge of claim 1, wherein the seal cartridge blank is made by the process of: the blank for welding and forming the magnetic tube (2) comprises a magnetic conduction strip-shaped blank with the material of 0Cr13 and a non-magnetic conduction strip-shaped blank with the material of solid solution state 1Cr18Ni10Ti, wherein the magnetic conduction strip-shaped blank not only comprises a main body part with the trapezoidal section consistent with the shape of the non-magnetic conduction strip-shaped blank, but also comprises an auxiliary part with the rectangular section fixedly connected with the short side of the two sides parallel to the main body part; the tool is a cylinder matched with the inner diameter of the sealing cylinder, a plurality of grooves are annularly and symmetrically distributed on the surface of the tool matched with the inner diameter of the magnetic tube (2), the number and the extension direction of the grooves are consistent with those of the magnetic conduction strip-shaped blanks, the grooves are matched with the auxiliary parts of the magnetic conduction strip-shaped blanks, the auxiliary parts of the magnetic conduction strip-shaped blanks are placed in the grooves of the tool to realize the positioning of the magnetic conduction strip-shaped blanks, the size of the non-magnetic conduction strip-shaped blanks is matched with the space between every two adjacent magnetic conduction strip-shaped blanks, the non-magnetic conduction strip-shaped blanks are placed between every two adjacent magnetic conduction strip-shaped blanks, then the non-magnetic conduction tube (1) is sleeved on the tool at the end part of the blanks, and the magnetic conduction strip-shaped blanks.
7. The method of claim 6, wherein the tooling is made of carbon steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910722565.3A CN110484709B (en) | 2019-08-06 | 2019-08-06 | Method for eliminating welding stress of sealing cylinder in nuclear reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910722565.3A CN110484709B (en) | 2019-08-06 | 2019-08-06 | Method for eliminating welding stress of sealing cylinder in nuclear reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110484709A CN110484709A (en) | 2019-11-22 |
| CN110484709B true CN110484709B (en) | 2021-02-05 |
Family
ID=68549944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910722565.3A Active CN110484709B (en) | 2019-08-06 | 2019-08-06 | Method for eliminating welding stress of sealing cylinder in nuclear reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110484709B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846608A (en) * | 2020-12-28 | 2021-05-28 | 中国原子能科学研究院 | Welding tool for laser welding of sealing cylinder |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0704118D0 (en) * | 2007-03-02 | 2007-04-11 | Welding Inst | Method of relieving residual stress in a welded structure |
| CN101444870B (en) * | 2008-12-30 | 2011-07-20 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for hot-sizing welded integral vane disk by utilizing electron beam |
| CN102009325B (en) * | 2010-11-07 | 2012-07-25 | 上海交通大学 | Method for improving corrosion resistance of weld joint of hastelloy conductive roller |
| CN102230066B (en) * | 2011-06-22 | 2013-02-13 | 中石化第十建设有限公司 | Local heat treatment process for welding seam of 12CrlMoV pipe |
| CN105463176A (en) * | 2015-12-02 | 2016-04-06 | 哈尔滨电气动力装备有限公司 | Shell flange postweld heat treatment process method |
| CN108504847A (en) * | 2018-04-08 | 2018-09-07 | 阳泉煤业集团华越机械有限公司 | A kind of hydraulic support structural member post weld heat treatment method |
| CN109967974B (en) * | 2019-02-26 | 2021-11-26 | 安徽森钢建筑工程有限公司 | Method for reducing welding stress of steel structure product |
-
2019
- 2019-08-06 CN CN201910722565.3A patent/CN110484709B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110484709A (en) | 2019-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105880908B (en) | Control the device and method of the welding deformation of sheet member docking | |
| CN109848650B (en) | Processing method of B-shaped sleeve | |
| CN110484709B (en) | Method for eliminating welding stress of sealing cylinder in nuclear reactor | |
| US10668556B2 (en) | Direct resistance heating simulation method | |
| US20190061044A1 (en) | Method for manufacturing double pipe | |
| CN1157768A (en) | Fabrication method of welded steel pipe using dual-phase stainles steel | |
| JP2012246569A (en) | Method for manufacturing weld-free apparatus for connection of dissimilar metal using functionally graded compositionally control powder metallurgy and hot isostatic processing method | |
| CN102330032A (en) | Acid-proof X70MS steel-grade spiral welded pipe and manufacturing method thereof | |
| JP4916940B2 (en) | Heat treatment method and heat treatment apparatus for welded steel pipe | |
| CN107790865B (en) | A kind of assembly welding method of stainless steel clad plate | |
| CN213519426U (en) | Superconducting coil heat shield component of thermonuclear fusion reactor | |
| CN102717228B (en) | Metal strip steel loop set forming method and device | |
| CN104972214A (en) | Electron beam welding method for bearing block of gas turbine | |
| EP2886237A1 (en) | Welding device for electric resistance welded pipe | |
| CN104475927A (en) | Welding method of air cooled condenser single row tube and tube plate employing carbon dioxide and argon mixed gas protection | |
| CN112743298B (en) | Method for manufacturing cooling system heat shield module | |
| EP2222432B1 (en) | Apparatuses for and methods of forge welding elongated articles with electrodes and an induction coil | |
| CN205014819U (en) | Novel water -cooling horse not | |
| JP3712797B2 (en) | Welded structure of ferritic heat resistant steel pipe | |
| JP3572285B2 (en) | Wrapper tube with welded joint and method of manufacturing the same | |
| CN106312284A (en) | Vacuum electron beam welding method for titanium alloy narrow-gap weld joints | |
| CN105562893A (en) | Welding method used for CO2 gas shielded welding of large-specification ultrahigh-strength steel plate | |
| DE102016215265A1 (en) | Production method of a heat exchanger tube | |
| JP5763181B2 (en) | Manufacturing method of steel product having fine ferrite grain boundary precipitation type martensite structure | |
| JPH1071423A (en) | Square steel tube and its production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |