CN108838573B - Low-alloy steel and stainless steel composite repair welding method and system for nuclear power pressure vessel - Google Patents
Low-alloy steel and stainless steel composite repair welding method and system for nuclear power pressure vessel Download PDFInfo
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- CN108838573B CN108838573B CN201810676559.4A CN201810676559A CN108838573B CN 108838573 B CN108838573 B CN 108838573B CN 201810676559 A CN201810676559 A CN 201810676559A CN 108838573 B CN108838573 B CN 108838573B
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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
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
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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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Abstract
The invention discloses a composite repair welding method for low alloy steel and stainless steel of a pressure vessel for nuclear power, which comprises the following steps: s1, removing the defective part of the inner wall of the pressure container to obtain a repair welding groove; the inner wall of the pressure container comprises a low alloy steel base material and a stainless steel overlaying layer covering the low alloy steel base material, and the repair welding groove extends into the low alloy steel base material; s2, performing low alloy steel repair welding on the low alloy steel base metal in the repair welding groove, and performing repair welding to a fusion line of the original stainless steel overlaying layer; and S3, performing stainless steel repair welding on the low alloy steel repair welding layer, and performing repair welding until the repair welding is flush with the stainless steel overlaying layer around the repair welding groove. The invention also discloses a low alloy steel and stainless steel composite repair welding system for the nuclear power pressure vessel. The invention can realize the repair of the pressure vessel for nuclear power through the low alloy steel and stainless steel composite repair welding process.
Description
Technical Field
The invention relates to the technical field of nuclear power stations, in particular to a composite repair welding method for low alloy steel and stainless steel of a pressure vessel for nuclear power.
Background
The parent metal of the pressure vessel for nuclear power is made of low alloy steel material, and stainless steel material is welded on the inner wall of the pressure vessel in engineering practice. After the stainless steel overlaying welding of the inner wall of the pressure container is finished, the low alloy steel is needed to be polished to finish defect removal probably due to the occurrence of the overproof defect. If the defect depth is large or the control is improper in the polishing process, the low alloy steel base metal is easily thinned in a large range.
On the premise that the size of the polishing area meets the requirement of mechanical analysis, stainless steel is generally adopted to be welded to be flush with stainless steel around the defect. For the condition that a defect polishing area does not meet mechanical analysis, corresponding repair technology does not exist in the field of manufacturing of pressure vessels for nuclear power at present, equipment is directly scrapped in common disposal, and materials are fed again for manufacturing products, so that great waste is caused.
Disclosure of Invention
The invention provides a method and a system for composite repair welding of low alloy steel and stainless steel of a pressure vessel for nuclear power, aiming at the problems in the prior art, and the repair of the pressure vessel for nuclear power can be realized through a composite repair welding process of low alloy steel and stainless steel.
The technical scheme provided by the invention for the technical problem is as follows:
on one hand, the invention provides a composite repair welding method of low alloy steel and stainless steel of a pressure vessel for nuclear power, which comprises the following steps:
s1, removing the defective part of the inner wall of the pressure container to obtain a repair welding groove; the inner wall of the pressure container comprises a low alloy steel base material and a stainless steel overlaying layer covering the low alloy steel base material, and the repair welding groove extends into the low alloy steel base material;
s2, performing low alloy steel repair welding on the low alloy steel base metal in the repair welding groove, and performing repair welding to a fusion line of the original stainless steel overlaying layer;
and S3, performing stainless steel repair welding on the low alloy steel repair welding layer, and performing repair welding until the repair welding is flush with the stainless steel overlaying layer around the repair welding groove.
Further, the step S1 specifically includes:
and polishing and removing the defective parts of the inner wall of the pressure container layer by layer, and removing the preset depth of each layer until the defects are completely removed to obtain the repair welding groove meeting the preset appearance and size.
Further, the step S2 further includes:
and arranging a groove with preset width and depth in the edge area of the low alloy steel weld repairing layer.
Further, before the step S2, the method further includes:
preheating the repair welding area;
after the step S2, the method further includes:
and carrying out post heat treatment, cleaning and nondestructive testing on the low alloy steel weld repair layer.
Further, the step S3 specifically includes:
covering the low alloy steel weld repairing layer by adopting a stainless steel lapping welding bead;
cladding a stainless steel reinforcing weld bead on the lapping weld bead;
performing stainless steel repair welding on the reinforcing weld bead, and performing post heat treatment when the total thickness of the stainless steel reaches a preset value;
and continuously performing repair welding on the treated stainless steel repair welding layer until the repair welding layer is flush with the stainless steel build-up welding layer around the repair welding groove.
Furthermore, the central line of the lapping welding bead is superposed with the fusion line of the original stainless steel overlaying layer, and the junction of the lapping welding bead and the reinforcing welding bead is forbidden to be positioned at the fusion line of the original stainless steel overlaying layer.
Further, before the step S3, the method further includes:
preheating the repair welding area;
after the step S3, the method further includes:
cleaning and nondestructive testing the stainless steel repair welding layer;
and (4) performing stress relief heat treatment on the pressure container.
Further, the cleaning of the repair welding layer comprises the following steps:
cleaning the surface of the repair welding layer, removing welding slag, impurities, undercut, air holes and cracks on the surface of the repair welding layer, and polishing the surface brightness of the repair welding layer to enable the edge of the repair welding layer to be in smooth transition with the periphery.
Further, the nondestructive testing of the low alloy steel weld repair layer comprises visual testing, liquid penetration testing and ultrasonic testing, or visual testing, magnetic powder testing and ultrasonic testing; the nondestructive detection of the stainless steel weld repairing layer comprises visual detection, liquid permeation detection and ultrasonic detection;
the nondestructive testing of the weld repair layer comprises the following steps:
and carrying out nondestructive testing on the repair welding layer, checking and accepting according to a preset checking and accepting standard, and continuing to carry out the subsequent steps after the quality of the repair welding layer is determined to be qualified.
On the other hand, the invention provides a nuclear power pressure vessel low alloy steel and stainless steel composite repair welding system, which can realize the nuclear power pressure vessel low alloy steel and stainless steel composite repair welding method, and the system comprises the following steps:
the defective part removing module is used for removing the defective part on the inner wall of the pressure container to obtain a repair welding groove; the inner wall of the pressure container comprises a low alloy steel base material and a stainless steel overlaying layer covering the low alloy steel base material, and the repair welding groove extends into the low alloy steel base material;
the low alloy steel repair welding module is used for performing low alloy steel repair welding on a low alloy steel base metal in the repair welding groove and performing repair welding to a fusion line of an original stainless steel overlaying layer;
and the stainless steel repair welding module is used for performing stainless steel repair welding on the low alloy steel repair welding layer, and the repair welding is performed to be level with the stainless steel overlaying layer around the repair welding groove.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
after the defective part of the inner wall of the pressure container is removed, low alloy steel repair welding is firstly carried out on the defective part, the low alloy steel part of the product is recovered to the original welding line of the welding line, then stainless steel repair welding is carried out, the stainless steel repair welding is carried out until the stainless steel repair welding is flush with the surrounding overlaying layer, and the repair of the pressure container is realized; aiming at the overlapping control problem of the composite repair welding edge weld bead of dissimilar metal (low alloy steel and stainless steel), the low alloy steel repair welding edge is provided with the groove, so that the thinning amount of a low alloy steel base metal is reduced to the maximum extent, the low alloy steel at the repair welding edge area is effectively prevented from being overlapped to the stainless steel surfacing layer, and the welding defect of the overlapping area is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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 to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a low alloy steel and stainless steel composite repair welding method for a nuclear power pressure vessel according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a repair welding groove in a low alloy steel and stainless steel composite repair welding method for a nuclear power pressure vessel according to a first embodiment of the present invention;
FIG. 3 is a top view of a repair welding groove in a low alloy steel and stainless steel composite repair welding method for a nuclear power pressure vessel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a weld bead arrangement in a low alloy steel and stainless steel composite repair welding method for a nuclear power pressure vessel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a low alloy steel and stainless steel composite repair welding system for a nuclear power pressure vessel, according to a second embodiment of the present invention.
Detailed Description
In order to solve the technical problems that a pressure vessel cannot be repaired under the condition that a defect polishing area does not meet mechanical analysis in the prior art, the invention aims to provide a composite repair welding method of low alloy steel and stainless steel of the pressure vessel for nuclear power, which has the core idea that: the method comprises the steps of clearing a defective part of the inner wall of the pressure vessel for nuclear power, performing low alloy steel repair welding on the defective part, recovering a low alloy steel part of a product to an original welding line, and performing stainless steel repair welding to enable the stainless steel to be repair-welded to be flush with a peripheral overlaying layer, so that the pressure vessel is repaired.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a composite repair welding method of low alloy steel and stainless steel of a pressure vessel for nuclear power, and the method comprises the following steps of:
s1, removing the defective part of the inner wall of the pressure container to obtain a repair welding groove; the inner wall of the pressure container comprises a low alloy steel base material and a stainless steel overlaying layer covering the low alloy steel base material, and the repair welding groove extends into the low alloy steel base material;
s2, performing low alloy steel repair welding on the low alloy steel base metal in the repair welding groove, and performing repair welding to a fusion line of the original stainless steel overlaying layer;
and S3, performing stainless steel repair welding on the low alloy steel repair welding layer, and performing repair welding until the repair welding is flush with the stainless steel overlaying layer around the repair welding groove.
Further, the step S1 specifically includes:
and polishing and removing the defective parts of the inner wall of the pressure container layer by layer, and removing the preset depth of each layer until the defects are completely removed to obtain the repair welding groove meeting the preset appearance and size.
In order to ensure the quality of the repair weld, the dimensions of the repaired weld after the defective portion is removed are strictly controlled during the repair process. The defect part is removed by adopting a mechanical processing or manual tool (a grinding wheel or an electric milling machine). And (3) aiming at flaw detection defects, a layer-by-layer polishing removal method is adopted, each layer is removed by 0.5mm of depth until the defects are completely removed, and a repair welding groove 1 can be obtained after the removal, penetrates through a stainless steel overlaying layer 2 on the inner wall of the pressure vessel and penetrates into a low alloy steel base metal 3, as shown in figures 2 and 3. The dimensional requirements of the repair weld groove, i.e., the requirements for removing the defective portion, are shown in table 1.
| Symbol | Name (R) | Require that |
| θ | Defective portion removal angle | Greater than 40 ° |
| R1 | Bottom fillet of defect part | Greater than 5mm |
| R2 | Outer surface fillet of defect part | Greater than 15mm |
| L1 | Width of bottom of defect | Greater than or equal to 20mm |
| L2 | Length of defect part | Greater than or equal to 60mm |
TABLE 1
Further, the step S2 further includes:
and arranging a groove with preset width and depth in the edge area of the low alloy steel weld repairing layer.
It should be noted that repair welding can be performed after the defects are completely removed by polishing. In the repair welding process, the low alloy steel repair welding of the defect part is carried out on the inner wall of the container, the low alloy steel part of the product is recovered to the original welding line of the welding line, and meanwhile, the stainless steel layer repaired and welded at the defect part is repaired to be flush with the stainless steel overlaying layer around. In the repair welding area, the strength of the low alloy steel welding material needs to be matched with that of the low alloy steel base material. Taking a reactor pressure vessel as an example: the low alloy steel welding material adopts the E9016-G type, and the performance strength matching requirement of the low alloy steel repair welding layer and the low alloy steel base material is specifically shown in the table 2 so as to meet the requirement of the service performance of the product.
TABLE 2
However, the problem of controlling the overlapping of the edge weld bead in the composite repair welding of dissimilar metals (low alloy steel and stainless steel) is solved by grooving the repair welding edge of the low alloy steel. As shown in figure 4, the groove 7 enables the edge area of the low alloy steel weld repair layer 9 to be 2mm lower than the original weld joint weld line, and the groove width of the weld repair edge area is 0.5-2 weld bead widths, so that the reduction amount of a low alloy steel base material is reduced to the maximum extent, the low alloy steel of the weld repair edge area is effectively prevented from being lapped on a stainless steel weld overlay, and the welding defect of a lapping area is avoided.
Further, the step S3 specifically includes:
covering the low alloy steel weld repairing layer by adopting a stainless steel lapping welding bead;
cladding a stainless steel reinforcing weld bead on the lapping weld bead;
performing stainless steel repair welding on the reinforcing weld bead, and performing post heat treatment when the total thickness of the stainless steel reaches a preset value;
and continuously performing repair welding on the treated stainless steel repair welding layer until the repair welding layer is flush with the stainless steel build-up welding layer around the repair welding groove.
When the inner wall of the pressure vessel is subjected to repair welding, the repair welding of low alloy steel and the repair welding of stainless steel are performed by the shielded metal arc welding method, wherein the stainless steel welding material adopts the types of E309L and E308L.
Taking a reactor pressure vessel as an example, the welding process parameter requirements are specifically shown in table 3.
TABLE 3
In the stainless steel repair welding process, the overlap bead 4 is first covered with stainless steel (type E309L) at the weld joint 8, then the reinforcement bead 5 of stainless steel (type E309L) is deposited on the overlap bead 4, and finally the repair welding of stainless steel (type E308L) is performed on the reinforcement bead 5, that is, the stainless steel weld overlay 6, as shown in fig. 4. The contact area with the low alloy steel base material is covered with the E309L welding material.
In order to ensure the quality of the repaired welding line, the welding process sequence in the repairing process, the state of the cleaned welding line surface in the welding process, the control of the welding position of the stainless steel layer on the fusion line and the like are strictly controlled.
In a preferred embodiment, before the step S2, the method further includes:
preheating the repair welding area;
after the step S2, the method further includes:
and carrying out post heat treatment, cleaning and nondestructive testing on the low alloy steel weld repair layer.
Further, before the step S3, the method further includes:
preheating the repair welding area;
after the step S3, the method further includes:
cleaning and nondestructive testing the stainless steel repair welding layer;
and (4) performing stress relief heat treatment on the pressure container.
Specifically, the overall process flow of the repair is as follows:
preheating → mother material repair welding → post heat treatment → grinding → VT (visual inspection), PT (liquid penetration inspection)/MT (magnetic powder inspection), UT (ultrasonic inspection) (accessible part, including mother material repair welding seam and heat affected zone of at least 5 mm), preheating → stainless steel repair welding (309L, 1 layer) → stainless steel repair welding (308L, stop welding when 309L +308L thickness is more than 5 mm) → post heat treatment → stainless steel repair welding (308L, rest layer) → grinding → VT, PT, UT (stainless steel build-up welding layer, mother material repair welding seam accessible part) → stress relief heat treatment along with the component → repair completion.
Further, the cleaning of the repair welding layer comprises the following steps:
cleaning the surface of the repair welding layer, removing welding slag, impurities, undercut, air holes and cracks on the surface of the repair welding layer, and polishing the surface brightness of the repair welding layer to enable the edge of the repair welding layer to be in smooth transition with the periphery.
It should be noted that the repair welding layer is also called a welding seam, and includes a low alloy steel repair welding layer and a stainless steel repair welding layer, and the corresponding repair welding layer needs to be cleaned when the low alloy steel repair welding layer and the stainless steel repair welding layer are obtained.
And for the stainless steel welding position on the fusion line of the original stainless steel overlaying layer, the central line of the lapping weld bead is required to be superposed with the fusion line of the original stainless steel overlaying layer, the relative position is allowed to deviate by +/-1 mm, and the junction of the lapping weld bead and the reinforcing weld bead is forbidden to be positioned at the fusion line of the original stainless steel overlaying layer.
Further, during repair, the overlapping amount of adjacent weld beads and the unevenness of the weld surface should be strictly controlled, as shown in table 4.
TABLE 4
Further, the nondestructive testing of the low alloy steel weld repair layer comprises visual testing, liquid penetration testing and ultrasonic testing, or visual testing, magnetic powder testing and ultrasonic testing; the nondestructive detection of the stainless steel weld repairing layer comprises visual detection, liquid permeation detection and ultrasonic detection;
the nondestructive testing of the weld repair layer comprises the following steps:
and carrying out nondestructive testing on the repair welding layer, checking and accepting according to a preset checking and accepting standard, and continuing to carry out the subsequent steps after the quality of the repair welding layer is determined to be qualified.
It should be noted that after the low alloy steel repair welding layer is welded, VT, PT/MT, UT (reachable portion) inspection should be performed, acceptance is performed according to a preset acceptance standard, and it is confirmed that the quality of the existing repair welding seam is qualified. And after the stainless steel weld repair layer is welded, checking VT, PT and UT (accessible parts of the stainless steel weld repair layer and the low alloy steel weld repair layer), and checking and accepting according to the original design requirements to ensure that the quality of the repaired parts is all qualified.
Acceptance criteria for non-destructive testing are described in detail below.
First, surface inspection (magnetic particle inspection or liquid penetrant inspection, preferably magnetic particle inspection) is performed before welding. The recording and acceptance criteria were as follows:
for MT (magnetic particle inspection):
displays with dimensions greater than 1mm are recorded.
The following are indicated as unacceptable:
1) linear display;
2) a non-linear display with a maximum dimension greater than 2 mm;
3)3 or more than 3 displays arranged linearly, the edge distance is less than 3mm, or the edge distance is between 3mm and 6mm but the extension length is more than 15 mm.
For PT (liquid penetration test):
displays with dimensions greater than 1mm are recorded.
The following are indicated as unacceptable:
1) linear display;
2) a circular display with a maximum dimension greater than 2 mm;
3)3 or more than 3 displays which are linearly arranged and have an edge spacing of less than 3 mm;
4) at 100cm with a maximum edge length of not more than 20cm, selected in a manner that is least detrimental to defects2There are 5 or more than 5 dense displays within the rectangular area of (a).
And secondly, carrying out surface inspection (magnetic powder inspection or liquid permeation inspection, preferably magnetic powder inspection) after welding, and carrying out ultrasonic inspection if the repair welding thickness is more than 5 mm. The recording and acceptance criteria were as follows:
for MT:
displays with dimensions greater than 2mm are recorded. Any displays in the form of chains, even if their display size is less than 2mm in the recorded size, should be further analyzed to determine the nature of these displays when their cumulative total length of displays exceeds 20 mm.
The following are indicated as unacceptable:
1) linear display;
2) a non-linear display with a maximum dimension greater than 4 mm;
3)3 or more than 3 displays arranged linearly, the edge distance is less than 3mm, or the edge distance is between 3mm and 6mm but the extension length is more than 20 mm.
For PT:
displays with dimensions greater than 2mm are recorded. Any displays in the form of chains, even if their display size is less than 2mm in the recorded size, should be further analyzed to determine the nature of these displays when their cumulative total length of displays exceeds 20 mm.
The following are indicated as unacceptable:
1) linear display;
2) a circular display with a maximum dimension greater than 4 mm;
3)3 or more than 3 displays which are linearly arranged and have an edge spacing of less than 3 mm;
4) at 100cm with a maximum edge length of not more than 20cm, selected in a manner that is least detrimental to defects2There are 5 or more than 5 dense displays within the rectangular area of (a).
For UT (ultrasonic testing):
any defect indication that the reflection amplitude is greater than or equal to 50% of the reference reflection amplitude (Hd/Hr is greater than or equal to 1/2, wherein Hd is the maximum reflection amplitude of the defect, and Hr is the maximum reflection amplitude of the phi 2mm transverse hole of the artificial reflector on the reference block) should be recorded.
The following defects are indicated as unacceptable:
1) any non-volume type defects;
2) any bulk type defect, whose length and amplitude are greater than the specified values in table 5.
TABLE 5
Defects in which the reflection amplitude is below 50% of the reference reflection amplitude are indicated regardless of rework, but when their continuous length is greater than 200mm, these defects are indicated to be further analyzed to determine their properties.
Example two
The embodiment of the invention provides a nuclear power pressure vessel low alloy steel and stainless steel composite repair welding system, which can realize all the processes of the nuclear power pressure vessel low alloy steel and stainless steel composite repair welding method, and referring to fig. 5, the system comprises:
a defective part removing module 51, configured to remove a defective part on an inner wall of the pressure vessel to obtain a repair welding groove; the inner wall of the pressure container comprises a low alloy steel base material and a stainless steel overlaying layer covering the low alloy steel base material, and the repair welding groove extends into the low alloy steel base material;
the low alloy steel repair welding module 52 is used for performing low alloy steel repair welding on the low alloy steel base metal in the repair welding groove and performing repair welding to a fusion line of the original stainless steel overlaying layer;
and the stainless steel repair welding module 53 is used for performing stainless steel repair welding on the low alloy steel repair welding layer, and the repair welding is performed to be parallel and level with the stainless steel overlaying layer around the repair welding groove.
In conclusion, the invention provides a method and a system for performing composite repair welding on low alloy steel and stainless steel of a pressure vessel for nuclear power, which have better practical effects: after the defective part of the inner wall of the pressure container is removed, low alloy steel repair welding is firstly carried out on the defective part, the low alloy steel part of the product is recovered to the original welding line of the welding line, then stainless steel repair welding is carried out, the stainless steel repair welding is carried out until the stainless steel repair welding is flush with the surrounding overlaying layer, and the repair of the pressure container is realized; aiming at the overlapping control problem of the composite repair welding edge weld bead of dissimilar metal (low alloy steel and stainless steel), the low alloy steel repair welding edge is provided with the groove, so that the thinning amount of a low alloy steel base metal is reduced to the maximum extent, the low alloy steel at the repair welding edge area is effectively prevented from being overlapped to the stainless steel surfacing layer, and the welding defect of the overlapping area is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A nuclear power pressure vessel low alloy steel and stainless steel composite repair welding method is characterized by comprising the following steps:
s1, removing the defective part of the inner wall of the pressure container to obtain a repair welding groove; the inner wall of the pressure container comprises a low alloy steel base material and a stainless steel overlaying layer covering the low alloy steel base material, and the repair welding groove extends into the low alloy steel base material;
s2, performing low alloy steel repair welding on the low alloy steel base metal in the repair welding groove, and performing repair welding to a fusion line of the original stainless steel overlaying layer;
s3, performing stainless steel repair welding on the low alloy steel repair welding layer until the repair welding is flush with the stainless steel overlaying layer around the repair welding groove;
the step S1 specifically includes:
polishing and removing the defective parts of the inner wall of the pressure container layer by layer, and removing each layer with a preset depth of 0.5mm until the defects are completely removed to obtain a repair welding groove meeting the preset appearance and size;
the step S2 further includes:
and arranging a groove with preset width and depth in the edge area of the low alloy steel weld repairing layer.
2. The method for performing composite repair welding on low alloy steel and stainless steel of a nuclear power pressure vessel according to claim 1, wherein before step S2, the method further comprises the following steps:
preheating the repair welding area;
after the step S2, the method further includes:
and carrying out post heat treatment, cleaning and nondestructive testing on the low alloy steel weld repair layer.
3. The composite repair welding method for the low alloy steel and the stainless steel of the nuclear power pressure vessel as claimed in claim 1, wherein the step S3 specifically includes:
covering the low alloy steel weld repairing layer by adopting a stainless steel lapping welding bead;
cladding a stainless steel reinforcing weld bead on the lapping weld bead;
performing stainless steel repair welding on the reinforcing weld bead, and performing post heat treatment when the total thickness of the stainless steel reaches a preset value;
and continuously performing repair welding on the treated stainless steel repair welding layer until the repair welding layer is flush with the stainless steel build-up welding layer around the repair welding groove.
4. The method for composite repair welding of low alloy steel and stainless steel for a nuclear power pressure vessel as claimed in claim 3, wherein the centerline of said lap weld bead coincides with the weld line of the original stainless steel weld overlay and the intersection of said lap weld bead and said reinforcement weld bead is prohibited from being located at the weld line of the original stainless steel weld overlay.
5. The method for performing composite repair welding on low alloy steel and stainless steel of a nuclear power pressure vessel according to claim 3, wherein before step S3, the method further comprises the following steps:
preheating the repair welding area;
after the step S3, the method further includes:
cleaning and nondestructive testing the stainless steel repair welding layer;
and (4) performing stress relief heat treatment on the pressure container.
6. The composite repair welding method for the low alloy steel and the stainless steel of the nuclear power pressure vessel as claimed in claim 2 or 5, wherein the cleaning of the repair welding layer comprises the following steps:
cleaning the surface of the repair welding layer, removing welding slag, impurities, undercut, air holes and cracks on the surface of the repair welding layer, and polishing the surface brightness of the repair welding layer to enable the edge of the repair welding layer to be in smooth transition with the periphery.
7. The composite repair welding method for the low alloy steel and the stainless steel of the nuclear power pressure vessel as claimed in claim 2 or 5, wherein the nondestructive testing of the low alloy steel repair welding layer comprises visual testing, liquid penetration testing and ultrasonic testing, or visual testing, magnetic powder testing and ultrasonic testing; the non-destructive testing of the stainless steel weld repair layer comprises visual testing, liquid penetration testing and ultrasonic testing;
the nondestructive testing of the weld repair layer comprises the following steps:
and carrying out nondestructive testing on the repair welding layer, checking and accepting according to a preset checking and accepting standard, and continuing to carry out the subsequent steps after the quality of the repair welding layer is determined to be qualified.
8. A nuclear power pressure vessel low-alloy steel and stainless steel composite repair welding system capable of realizing the nuclear power pressure vessel low-alloy steel and stainless steel composite repair welding method as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
the defective part removing module is used for removing the defective part on the inner wall of the pressure container to obtain a repair welding groove; the inner wall of the pressure container comprises a low alloy steel base material and a stainless steel overlaying layer covering the low alloy steel base material, and the repair welding groove extends into the low alloy steel base material;
the low alloy steel repair welding module is used for performing low alloy steel repair welding on a low alloy steel base metal in the repair welding groove and performing repair welding to a fusion line of an original stainless steel overlaying layer;
and the stainless steel repair welding module is used for performing stainless steel repair welding on the low alloy steel repair welding layer, and the repair welding is performed to be level with the stainless steel overlaying layer around the repair welding groove.
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Address after: 518023 Office Building of Daya Bay Nuclear Power Base Engineering Company, Pengfei Road, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Patentee after: First heavy Group Dalian Nuclear Power Petrochemical Co., Ltd Address before: 518023 Office Building of Daya Bay Nuclear Power Base Engineering Company, Pengfei Road, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Patentee before: China First Heavy Machinery Group Dalian hydrogenation reactor Manufacturing Co., Ltd |
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