CN112440020A - Repair welding process and evaluation method for weld defects of corrosion-resistant alloy composite pipe - Google Patents
Repair welding process and evaluation method for weld defects of corrosion-resistant alloy composite pipe Download PDFInfo
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- CN112440020A CN112440020A CN202011279472.7A CN202011279472A CN112440020A CN 112440020 A CN112440020 A CN 112440020A CN 202011279472 A CN202011279472 A CN 202011279472A CN 112440020 A CN112440020 A CN 112440020A
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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
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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
- B23K31/10—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 cutting or desurfacing
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Abstract
The invention provides a repair welding process and an evaluation method for weld defects of a corrosion-resistant alloy composite pipe, and relates to the technical field of pipeline welding. And classifying the defects of the process welding line and then repairing the defects. The first defect type is a crater crack defect and is removed through polishing; the second defect type is that the root welding area or the transition layer has defects, and the defects are removed by welding after the first groove is formed; the third defect type is other crack defects except the first defect type and the second defect type, and is removed by welding after a second groove is formed; and the fourth defect type is a non-crack defect except the second defect type and is removed by welding after a third groove is formed. The method comprises the step of evaluating the hardness test results of a first sampling area, a second sampling area, a third sampling area, a fourth sampling area and a fifth sampling area of the repaired section welding line. The beneficial effects of the invention include: the method can be used for carrying out repair welding on the bimetal composite pipe, and can evaluate the repair welding process of the bimetal composite pipe.
Description
Technical Field
The invention relates to the technical field of pipeline welding, in particular to a process and an evaluation method for repairing and welding weld defects of a stainless steel corrosion-resistant alloy composite pipe.
Background
Pipeline welding generally adopts a single-side welding and double-side forming mode, most of welding seam defects exist in the root part of the innermost welding seam, and the defects need to be repaired. The current rework process is only for single layer pipe and lacks a rework process for multi-layer pipe. Meanwhile, when the weld with defects is repaired, the weld performance is affected because the heat affected zone and the weld metal are easily weakened due to repeated heating. The chinese invention patent CN201711488830.3 discloses a welding repair evaluation method, which can largely avoid the hidden trouble of repair to the product quality, but it is only directed to a welding repair evaluation method of a single-layer tube, and not to a multi-layer tube.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art.
In order to achieve the above object, an aspect of the present invention provides a repair process for weld defects of a corrosion-resistant alloy composite pipe. The repair process comprises the steps of firstly distinguishing defect types of each section of welding seam to be repaired, wherein the first defect type is a crater crack defect, and the second defect type is a defect existing in a root welding area or a transition layer; the third defect type is other crack defects except the first and second defect types; the fourth defect type is a non-crack type defect other than the second defect type. Then removing the first defect type by polishing; forming a first groove and performing first welding on the first groove to form a first repair welding line so as to repair a second defect type; forming a second groove and performing second welding on the second groove to form a second repair welding line so as to repair a third defect type; and forming a third repair welding seam by forming a third groove and carrying out third welding on the third groove so as to repair a fourth defect type. In the process, the lengths of the single welding seams of the first, second and third repair welding seams corresponding to the same full welding seam are not more than 30% of the length of the full welding seam, the sum of the lengths of the first, second and third repair welding seams corresponding to the same full welding seam is not more than 40% of the length of the full welding seam, and the full welding seam is composed of a plurality of sections of welding seams at one welding position. The first groove and the second groove are formed by cutting off corresponding section welding seams and heat affected zones thereof; the central line of the third groove starts from a fusion line of a section welding line to be repaired, and the thickness between the bottom of the third groove close to the central line of the corrosion-resistant alloy composite pipe and the inner surface of the corrosion-resistant alloy composite pipe is larger than the sum of the thickness of the root welding area and the transition layer.
The invention further provides a two-cycle repair process for the weld defects of the corrosion-resistant alloy composite pipe, which comprises a first cycle repair process and a second cycle repair process. The first periodic repair process is to repair the weld joints by adopting different methods after distinguishing the defect types of the weld joints of each section to be repaired. The first defect type is a crater crack defect, and the second defect type is a defect existing in a root welding area or a transition layer; the third defect type is other crack defects except the first and second defect types; the fourth defect type is a non-crack type defect other than the second defect type. The first defect type is removed by thinning. And forming a first repair welding seam by forming a first groove and performing first welding on the first groove so as to repair the second defect type. And forming a second repair welding line by forming a second groove and performing second welding on the second groove so as to repair a third defect type. And forming a third repair welding seam by forming a third groove and carrying out third welding on the third groove so as to repair a fourth defect type. And the first groove and the second groove are formed by cutting off the corresponding section welding seam and the heat affected zone thereof. The central line of the third groove starts from a fusion line of a section welding line to be repaired, and the thickness between the bottom of the third groove close to the central line of the corrosion-resistant alloy composite pipe and the inner surface of the corrosion-resistant alloy composite pipe is larger than the sum of the thickness of the root welding area and the transition layer. The length of the single welding seam corresponding to the first, second and third repair welding seams of the same full welding seam is not more than 30% of the length of the full welding seam, the sum of the lengths of the first, second and third repair welding seams corresponding to the same full welding seam is not more than 40% of the length of the full welding seam, and the full welding seam is composed of a plurality of sections of welding seams located at one welding position. And the second period repair process is to use the repair welding line, the first repair welding line, the second repair welding line or the third repair welding line obtained by polishing in the first period repair process as a new section welding line to be repaired, when the new section welding line to be repaired has non-crack defects with the length less than or equal to 50mm and can form a fourth groove, the fourth groove is formed and fourth welding is carried out on the fourth groove to form a fourth repair welding line for repair, the distance between the bottom of the fourth groove and the inner surface of the corrosion-resistant alloy composite pipe is greater than or equal to 1.25 times of the sum of the thickness of the root welding area and the thickness of the transition layer, and the central line of the bottom of the fourth groove starts from a fusion line of the new section welding line to be repaired and the base metal.
The invention also provides a repair process evaluation method for the weld defects of the corrosion-resistant alloy composite pipe. The sampling position for performing hardness test on the repaired section welding seam by the evaluation method comprises a first sampling area, a second sampling area, a third sampling area, a fourth sampling area and a fifth sampling area. The first sampling area is a partial repair heat affected zone below the groove bottom tangent plane of the repair weld. The second sampling area is a partial repair heat affected zone which is arranged (1.5-3) ± 0.5mm above the tangent plane at the bottom of the groove of the repair welding line. And the third sampling area is a part of the repaired welding line at the position (1.5-3) +/-0.5 mm above the tangent plane of the bottom of the groove of the repaired welding line. And the fourth sampling area is a partial repair heat affected area which is 1.5-3 +/-0.5 mm below a connecting line of two points of a repair welding seam and a repair heat affected area which are in contact with air simultaneously. And the fifth sampling area is a partial repair welding line which is 1.5-3 +/-0.5 mm below a connecting line of two points, wherein the connecting line is formed by the repair welding line and the repair heat affected zone and is simultaneously in contact with air. The upper part is far away from the inner wall of the composite pipe. The lower part is close to the inner wall of the composite pipe. The evaluation method comprises the steps of taking at least one sampling point in a first sampling area, at least one left sampling point and at least one right sampling point in a second sampling area, at least one sampling point in a third sampling area, at least one left sampling point and at least one right sampling point in a fourth sampling area and at least one sampling point in a fifth sampling area for hardness detection, wherein if the hardness of all sampling positions is 95-100% of that of a base material, the hardness detection result of the repaired section welding line is qualified.
Compared with the prior art, the beneficial effects of the invention can include: the repair welding of the bimetal composite pipe can be carried out, and the repair welding process of the bimetal composite pipe can be evaluated; the quality of the bimetal composite pipe after repair welding can be ensured.
Drawings
FIG. 1a illustrates different weld defect types in an exemplary embodiment of the invention;
FIG. 1b illustrates a situation after repair of a fourth defect class in an exemplary embodiment of the invention;
FIG. 2 illustrates a hardness-testing location of a rework weld in an exemplary embodiment of the invention.
The labels in the figure are:
a-a section weld, a B-a section weld heat affected zone, a C-a third repair weld, a D-a third repair weld heat affected zone, an E-a third groove, a thickness between the bottom of the F-a third groove and the inner surface of the composite tube, a G-root weld zone and a transition layer, an H-a first weld defect, an I-a second weld defect, a J-a third weld defect, a K-a fourth weld defect, an L-section weld fusion line, a M-a third groove center line, 1-a first sampling point of a first sampling zone, 2-four sampling points of a second sampling zone, 3-two sampling points of a third sampling zone, 4-four sampling points of a fourth sampling zone, 5-two sampling points of a fifth sampling zone, 6-an original weld heat affected zone, 7-an original weld, 8-repairing a heat affected zone of the weld on the base metal and the original weld metal, 9-repairing a groove bottom tangent plane of the weld, 10-repairing the weld, and 11-connecting two points of the boundary of the repairing weld and the heat affected zone and simultaneously contacting with air.
Detailed Description
Hereinafter, a repair welding process and an evaluation method for weld defects of a corrosion-resistant alloy clad pipe according to the present invention will be described in detail with reference to exemplary embodiments.
The terms "first," "second," "third," "fourth," "fifth," and the like herein are used merely for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance or order of magnitude.
Herein, the corrosion-resistant alloy composite pipe (hereinafter referred to as composite pipe) includes a standard oil and gas field lining bimetal composite pipe, an inner cladding corrosion-resistant alloy bimetal composite pipe and the like. For example, a composite tube in which the inner wall of a carbon steel tube is covered with a corrosion-resistant alloy layer or a stainless steel corrosion-resistant alloy composite tube.
The welding seam of the corrosion-resistant alloy composite pipe can be a welding seam of the composite pipe and the composite pipe, a welding seam of the composite pipe and a pure material pipe, a welding seam of the composite pipe and a pipe fitting (a pure material pipe fitting or a composite pipe fitting), a welding seam of a main pipe of the composite pipe and a branch pipe of the pure material pipe (the pipe diameter and the wall thickness are not limited), a welding seam of a branch pipe of the composite pipe (a riding type or a socket type) angle and the like, the wall thickness of the composite pipe can be 6-70 mm, and the outer diameter can be larger than DN 50.
The repair of the weld defects of the corrosion-resistant alloy composite pipe needs to be visual and manually reachable, or a repair system has video assistance, polishing, surface penetration detection and automatic P-GTAW functions and can repair the surface defects of root welding.
The internal repair is the repair of the corrosion-resistant alloy weld from the inside of the pipeline.
The transition layer is a weld bead at the interface of the corrosion-resistant alloy and another metal, such as a carbon steel interface.
The root welding area is a welding line with the inner surface of the welding line within 4.5mm upwards.
Example 1
The repair process for the weld defects of the corrosion-resistant alloy composite pipe described in the present exemplary embodiment requires that a welder qualified for repair perform the repair welding process.
The process of the invention firstly distinguishes the defects of each section of welding seam to be repaired, the first defect type is the crater crack defect, and the second defect type is the defect of a root welding area or a transition layer; the third defect type is other crack defects except the first and second defect types; the fourth defect type is a non-crack type defect other than the second defect type.
Then, different rework processes are performed for the first, second, third, or fourth defect types, respectively.
For the first defect type (namely, the arc pit crack defect), the arc pit crack belongs to a thermal crack, can be immediately found in the welding process, and can not cause systematic damage to the safety of a welding joint after the arc pit crack is polished, so the arc pit crack is removed by polishing.
For the second defect type, the corrosion resistance of the composite pipe is affected due to the defects of the root weld zone and the transition layer. The second defect type is repaired by forming a first bevel and first welding the first bevel to form a first rework weld.
For the third defect type, although no defect exists in the root welding area and the transition layer, the crack type defect except the crater crack is the most harmful defect in the welding seam, and the sharp tip of the crack is easy to form stress concentration, so that the crack is expanded to cause brittle failure. Therefore, a second repair weld is formed by forming a second groove and performing second welding on the second groove to repair the third defect type.
The first groove and the second groove are formed by cutting off the whole section welding seam including the heat affected zone and having the second defect type and the third defect type by adopting a mechanical cold cutting method and then grinding, the surfaces of the first groove, the second groove and the third groove which are formed by grinding should be in smooth transition, and the first groove, the second groove and the third groove can be welded only after visual detection and penetration detection are qualified. .
For the fourth defect type, because the fourth defect type has no defect in the root welding area and the transition layer and does not belong to a crack type defect, only a third groove needs to be formed and third welding is carried out on the third groove to form a third repair welding seam to repair the fourth defect type. And the third groove is formed by cutting off the solder area where the fourth defect type is located by adopting a mechanical cold cutting method and then polishing. In order to avoid the strength loss of the heat affected zone and the weld metal caused by repeated heating, the central line of the third groove starts from the fusion line of the section weld with the third defect type to be repaired and is perpendicular to the central line of the composite pipe; in order to ensure that the corrosion resistance of the composite pipe is not affected by the third welding, the thickness between the bottom of the third groove formed by polishing (i.e., the side of the third groove close to the composite pipe) and the inner surface of the composite pipe needs to be greater than the sum of the root welding area and the transition layer. For example, if the sum of the thickness of the root zone and the transition layer is 6mm, the thickness between the bottom of the third bevel and the inner surface of the composite pipe needs to be greater than 6 mm.
Further, the length of the single weld corresponding to the first, second and third repair welds of the same full weld is not more than 30% of the length of the full weld, and the sum of the lengths of the first, second and third repair welds corresponding to the same full weld is not more than 40% of the length of the full weld, the full weld is composed of a plurality of sections of welds located at one welding position, such as 3 sections, 4 sections, 6 sections, 8 sections, etc.
For example, a cross-sectional view of a segment weld A of a V-shaped full weld (i.e., the original weld) as shown in FIG. 1 a. The first weld defect H appears on the segment weld a, is a crater crack curve, belongs to a first defect type, and can be removed only by mechanical grinding.
The second weld defect I appears on the section weld A and is a defect of a root welding area and a transition layer G, and belongs to a second defect type, and a first groove is formed by cutting off the section weld A where the second weld defect I is located and a heat affected area B of the section weld and is subjected to first welding to form a first repair weld for repair.
And if the third weld defect J appears on the section weld A and is a crack defect which does not belong to the first defect type and the second defect type, the third weld defect J belongs to the third defect type, and a second groove is formed by cutting off the section weld A where the third weld defect J is located and the heat affected zone B of the section weld A, and the second groove is subjected to second welding to form a second repair weld for repairing.
The fourth weld defect K occurs in the section weld a except for the root weld zone and the transition layer G, and is a non-crack type defect (e.g., a pore defect, a slag inclusion defect, or the like), and then the fourth weld defect K belongs to a fourth defect type.
A cross-sectional view of the composite pipe after the fourth defect type repair is shown in fig. 1 b. And repairing by forming a third groove E and performing third welding on the third groove E to form a third repaired welding line C. The centerline M of the third groove begins at the weld line L of the section weld (i.e., the weld line of the original weld) and is perpendicular to the centerline of the composite pipe. Further, in order to ensure that the heat affected zone D of the third repaired weld does not cause corrosion resistance degradation and/or oxidation of the corrosion-resistant alloy layer when the third repaired weld C is welded, it is necessary to ensure that the thickness F between the bottom of the third bevel and the inner surface of the composite pipe is greater than the sum of the thicknesses of the root weld zone and the transition layer G, for example, greater than or equal to 6 mm.
Further, in order to ensure the repair quality, the sum of the lengths of the first, second and third repair welds (i.e., the section welds having weld defects) belonging to the same full weld needs to be less than or equal to a predetermined ratio of the full weld length, such as 40%, 35%, 30%, etc. Meanwhile, the single-seam lengths of the first, second and third rework welds of the same full weld are no greater than a predetermined proportion of the length of the full weld, such as 30%, 25%, 20%, etc.
Further, the step of forming the first rework weld may be performed by way of manual internal welding or full automatic internal welding. The manual internal welding needs to be performed under conditions that are visually accessible and that enable manual coping and welding operations. The full-automatic inner welding machine needs to use the full-automatic inner welding machine with the video auxiliary function for welding.
The step of reworking using manual internal welding includes:
removing PT detection residues of the groove by using a harmless solvent containing chloride ions, and then carrying out repair welding;
after the transition layer is welded, adding a corrosion-resistant alloy layer for welding;
and after the repair welding is finished, PT detection is carried out on the welding line of the cover surface corrosion-resistant alloy, and the welding line is qualified.
The step of using the full-automatic internal welding machine for internal repair comprises the following steps:
polishing and removing weld defects by using an in-pipe automatic polishing machine with a video auxiliary system;
detecting and qualifying the groove after the defect is removed by using a PT detection system with the function of automatic color photography of not less than 1200 ten thousand pixels;
welding the first layer of corrosion-resistant alloy by using a P-GTAW automatic welding machine with a video auxiliary system;
after the transition layer is welded, 1 layer of corrosion resistant alloy is added for welding;
and detecting the welding seam by adopting a PT detection system with a digital camera photographing auxiliary function and ensuring that the welding seam is qualified.
Example 2
The two-cycle repair process for the weld defects of the corrosion-resistant alloy composite pipe comprises a first cycle repair process and a second cycle repair process. The first periodic repair process is to repair the weld joints by adopting different methods after distinguishing the defect types of the weld joints of each section to be repaired. The first defect type is a crater crack defect, and the second defect type is a defect existing in a root welding area or a transition layer; the third defect type is other crack defects except the first and second defect types; the fourth defect type is a non-crack type defect other than the second defect type. The first defect type is removed by thinning. And forming a first repair welding seam by forming a first groove and performing first welding on the first groove so as to repair the second defect type. And forming a second repair welding line by forming a second groove and performing second welding on the second groove so as to repair a third defect type. And forming a third repair welding seam by forming a third groove and carrying out third welding on the third groove so as to repair a fourth defect type. And the first groove and the second groove are formed by cutting off the corresponding section welding seam and the heat affected zone thereof. The central line of the third groove starts from a fusion line of a section welding line to be repaired, and the thickness between the bottom of the third groove close to the central line of the corrosion-resistant alloy composite pipe and the inner surface of the corrosion-resistant alloy composite pipe is larger than the sum of the thickness of the root welding area and the transition layer. The length of the single welding seam corresponding to the first, second and third repair welding seams of the same full welding seam is not more than 30% of the length of the full welding seam, the sum of the lengths of the first, second and third repair welding seams corresponding to the same full welding seam is not more than 40% of the length of the full welding seam, and the full welding seam is composed of a plurality of sections of welding seams located at one welding position. And the second period repair process is to use the first period repair section welding line, the first repair welding line, the second repair welding line or the third repair welding line which are removed the first kind of defects through polishing in the first period repair process as the welding line of the new section to be repaired. And when the length of the welding line of the new section to be repaired is less than or equal to 50mm and a non-crack defect occurs and a fourth groove can be formed, performing fourth welding on the fourth groove to form a fourth repaired welding line for repairing. The distance between the bottom of the fourth groove and the inner surface of the corrosion-resistant alloy composite pipe is greater than or equal to 1.25 times of the sum of the thickness of the root welding area and the thickness of the transition layer, and the central line of the bottom of the fourth groove starts from a fusion line of a welding line of a section to be newly repaired and the base metal. And if the fourth groove cannot be formed on the welding line of the new section to be repaired, the second-period repairing process is not carried out on the welding line of the new section to be repaired.
For example, if the length of the weld joint of the new section to be repaired is 70mm, the second-cycle repair process is not performed on the weld joint of the new section to be repaired.
For another example, the length of the weld joint of the section to be newly repaired is 40mm, but the distance between the bottom of the fourth groove formed by final polishing and the inner surface of the corrosion-resistant alloy composite pipe is 7mm, the sum of the thickness of the root welding area and the thickness of the transition layer is 6mm, and the weld joint of the section to be newly repaired is not subjected to the second-period repair process because the thickness of 7mm is less than 1.25 times of that of 6 mm.
Example 3
The repair process evaluation method for weld defects of a corrosion-resistant alloy composite pipe according to the present exemplary embodiment evaluates a repair process by detecting a repair weld (e.g., a first repair weld, a second repair weld, or a third repair weld as described in example 1) for both a single repair process and a two-cycle repair process.
As shown in fig. 2, the original weld seam 7 is reworked due to the presence of a defect of the fourth defect type. Since defect repair for the fourth defect type does not require the entire heat-affected zone 6 of the original weld to be removed, but the centerline of the repair groove needs to start from the fusion line of the original weld, a portion of the heat-affected zone 6 of the original weld is removed. The defects of the original weld joint are repaired to form a repaired weld joint 10 and a heat affected zone 8 of the repaired weld joint on the base metal and the original weld metal. Hereinafter, the heat-affected zone 8 of the repaired weld on the base metal and the original weld metal is simply referred to as the repaired heat-affected zone 8.
The sampling position for performing hardness test on the repaired section welding seam comprises a first sampling area, a second sampling area, a third sampling area, a fourth sampling area and a fifth sampling area.
For example, as shown in fig. 2, the first sampling zone is the portion of the rework heat affected zone 8 below the groove bottom cut 9 of the rework weld 10. The lower part is close to the inner wall of the composite pipe.
The second sampling area is a partial repair heat affected zone at a position (1.5-3) ± 0.5mm above a groove bottom tangent plane 9 of a repair welding seam. The upper part is far away from the inner wall of the composite pipe.
The third sampling area is a part of the repaired welding line 10 which is (1.5-3) ± 0.5mm above the groove bottom tangent plane 9 of the repaired welding line.
The fourth sampling area is a part of the reworked heat affected area 8 which is 1.5-3 +/-0.5 mm below a connecting line 11 of two points of a boundary of the reworked welding line 10 and the reworked heat affected area 8 and simultaneously contacted with air.
The fifth sampling area is a partial repair weld 10 which is 1.5-3 +/-0.5 mm below a connecting line 11 of two points of a boundary of the repair weld 10 and the repair heat affected area 8 and simultaneously contacted with air.
At least one sampling point is taken in the first sampling area (e.g., one sampling point 1 in the first sampling area in fig. 2), at least one left-right two sampling points is taken in the second sampling area (e.g., four sampling points 2 in the second sampling area in fig. 2), at least one sampling point is taken in the third sampling area (e.g., two sampling points 3 in the third sampling area in fig. 2), at least one left-right two sampling points is taken in the fourth sampling area (e.g., four sampling points 4 in the fourth sampling area in fig. 2), and at least one sampling point is taken in the fifth sampling area (e.g., two sampling points 5 in the fifth sampling area in fig. 2).
The hardness test can be carried out by only taking the minimum number of sampling points (at least 7 points) in each sampling area, and the hardness test of the repair process of the repaired welding line is qualified as long as the hardness of each sampling point is 95-100% of that of the base material.
The hardness testing method is in accordance with relevant regulations of the existing national standard GB/T2654 of 'welding joint hardness testing method', and is used for detecting by adopting a Vickers hardness testing method under the load of 49.03N.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (8)
1. The repair process for the weld defects of the corrosion-resistant alloy composite pipe is characterized by comprising the following steps of:
distinguishing the defect types of each section of welding seam to be repaired, wherein the first defect type is a crater crack defect, and the second defect type is a defect existing in a root welding area or a transition layer; the third defect type is other crack defects except the first and second defect types; the fourth defect type is a non-crack type defect except the second defect type;
removing the first defect type by polishing; forming a first groove and performing first welding on the first groove to form a first repair welding line so as to repair a second defect type; forming a second groove and performing second welding on the second groove to form a second repair welding line so as to repair a third defect type; forming a third groove and performing third welding on the third groove to form a third repair weld to repair a fourth defect type, wherein the lengths of single welds of the first, second and third repair welds corresponding to the same full weld are not more than 30% of the length of the full weld, the sum of the lengths of the first, second and third repair welds corresponding to the same full weld is not more than 40% of the length of the full weld, the full weld is composed of a plurality of sections of welds located at one welding position,
the first groove and the second groove are both formed by cutting off corresponding section welding seams and heat affected zones thereof;
the central line of the third groove starts from a fusion line of a section welding line to be repaired, and the thickness between the bottom of the third groove close to the central line of the corrosion-resistant alloy composite pipe and the inner surface of the corrosion-resistant alloy composite pipe is larger than the sum of the thickness of the root welding area and the transition layer.
2. The process of claim 1, wherein the lengths of the single welds of the first, second and third repaired welds corresponding to the same full weld are no greater than 25% of the length of the full weld, and the sum of the lengths of the first, second and third repaired welds corresponding to the same full weld is no greater than 35% of the length of the full weld.
3. The repair process for weld defects of corrosion resistant alloy composite pipes according to claim 1, wherein the full weld is composed of 3 or 4 segment welds.
4. The repair process for weld defects of corrosion resistant alloy clad pipe according to claim 1, wherein the step of forming the first repair weld is performed by means of manual internal welding or full automatic internal welding, and comprises adding a corrosion resistant alloy welding layer after the first welding is completed to weld the transition layer.
5. A two-cycle repair process for weld defects of a corrosion-resistant alloy composite pipe is characterized by comprising a first cycle repair process and a second cycle repair process,
the first periodic repair process is used for distinguishing defect types of all sections of welding seams to be repaired, wherein the first defect type is a crater crack defect, and the second defect type is a defect existing in a root welding area or a transition layer; the third defect type is other crack defects except the first and second defect types; the fourth defect type is a non-crack type defect except the second defect type; removing the first defect type by polishing; forming a first groove and performing first welding on the first groove to form a first repair welding line so as to repair a second defect type; forming a second groove and performing second welding on the second groove to form a second repair welding line so as to repair a third defect type; forming a third groove and carrying out third welding on the third groove to form a third repair welding seam so as to repair a fourth defect type, wherein the first groove and the second groove are formed by cutting off corresponding section welding seams and heat affected zones thereof; the central line of the third groove starts from a fusion line of a section welding line to be repaired, and the thickness between the bottom of the third groove close to the central line of the corrosion-resistant alloy composite pipe and the inner surface of the corrosion-resistant alloy composite pipe is greater than the sum of the thickness of a root welding area and the thickness of a transition layer; the length of a single welding seam of the first, second and third repair welding seams corresponding to the same full welding seam is not more than 30% of the length of the full welding seam, the sum of the lengths of the first, second and third repair welding seams corresponding to the same full welding seam is not more than 40% of the length of the full welding seam, and the full welding seam is composed of a plurality of sections of welding seams at one welding position;
and the second period repair process is to use the repair welding line, the first repair welding line, the second repair welding line or the third repair welding line obtained by polishing in the first period repair process as a new section welding line to be repaired, when the new section welding line to be repaired has non-crack defects with the length less than or equal to 50mm and can form a fourth groove, the fourth groove is formed and fourth welding is carried out on the fourth groove to form a fourth repair welding line for repair, the distance between the bottom of the fourth groove and the inner surface of the corrosion-resistant alloy composite pipe is greater than or equal to 1.25 times of the sum of the thickness of the root welding area and the thickness of the transition layer, and the central line of the bottom of the fourth groove starts from a fusion line of the new section welding line to be repaired and the base metal.
6. The repair process of the weld defect of the corrosion-resistant alloy composite pipe according to any one of claims 1 to 4 or the evaluation method of the two-cycle repair process according to claim 5, wherein the sampling positions for performing hardness test on the repaired section weld sample comprise a first sampling area, a second sampling area, a third sampling area, a fourth sampling area and a fifth sampling area.
7. The method of claim 6, wherein the sampling locations for the hardness test comprise at least one sampling point of the first sampling area, two sampling points of the second sampling area, one sampling point of the third sampling area, two sampling points of the fourth sampling area, and one sampling point of the fifth sampling area.
8. The method for evaluating the repair process of the weld defects of the corrosion-resistant alloy composite pipe according to claim 6 or 7, characterized in that hardness detection is performed on sampling positions of the hardness detection, and if the hardness of all the sampling positions is 95-100% of that of the base material, the hardness detection result of the repaired section weld is qualified.
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