Method for evaluating performance of nickel-based welding material for welding and manufacturing LNG (Liquefied Natural Gas) storage tank
By conducting various performance tests and non-destructive testing of nickel-based welding materials manufactured by LNG storage tank welding, the defects in the engineering research of nickel-based welding materials were solved, qualified welding materials were screened out, welding strength and safety were improved, and the engineering application of domestic welding materials was realized.
Patent Information
- Application Number
- CN202510440074.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2025-07-11
AI Technical Summary
The existing technology has failed to achieve a complete engineering study of nickel-based welding materials for LNG storage tanks, resulting in the welded parts being prone to failure. As the LNG storage tank becomes larger, the material performance requirements are higher, and effective performance evaluation methods are urgently needed.
Provide a nickel-based welding material performance evaluation method for LNG tank welding manufacturing, including preparing welding test pieces, conducting a variety of performance tests and non-destructive testing, comprehensively evaluating the performance of the welding material, and screening out nickel-based welding material with qualified quality.
Through comprehensive evaluation, qualified nickel-based welding materials are screened to ensure welding strength and safety, lay the foundation for engineering application of domestic nickel-based welding materials, and achieve independent and controllable key welding materials.
Smart Images
Figure CN120286926A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of LNG storage tanks, and particularly to a method for evaluating the performance of nickel-based welding materials used in the welding manufacture of LNG storage tanks. Background Art
[0002] Developing liquefied natural gas (LNG) projects is one of the long-term goals of our country. At present, the materials and equipment of LNG receiving stations have been basically localized. With the rapid development of research and development work, the development of nickel-based welding materials has been completed, solving the problem of the availability of nickel-based welding materials. However, the complete engineering research work on nickel-based welding materials has not been achieved. Since the service environment of nickel-based welds is harsh and the welds are the parts of the structure most prone to failure, it is very necessary to carry out the engineering research on nickel-based welding materials. Moreover, with the enlargement of LNG storage tanks, higher requirements are put forward for material properties.
[0003] Therefore, there is an urgent need for a method for evaluating the performance of nickel-based welding materials used in the welding manufacture of LNG storage tanks to screen out nickel-based welding materials with qualified quality and improve the product passing rate. Summary of the Invention
[0004] The present invention provides a method for evaluating the performance of nickel-based welding materials used in the welding manufacture of LNG storage tanks to solve the defect that the existing technology has not achieved complete engineering research work on nickel-based welding materials for LNG storage tanks.
[0005] The present invention provides a method for evaluating the performance of nickel-based welding materials used in the welding manufacture of LNG storage tanks, including: Preparing welding specimens by using nickel-based welding materials for the welding manufacture of LNG storage tanks; Performing performance tests on the welding specimens for nickel-based welding materials of LNG storage tanks; Performing non-destructive testing on the welding joints of nickel-based welding materials of LNG storage tanks for the welding specimens; Combining the performance test results of nickel-based welding materials of LNG storage tanks and the performance test results of nickel-based welding materials of LNG storage tanks to obtain the performance evaluation results of nickel-based welding materials for the welding manufacture of LNG storage tanks.
[0006] According to the method for evaluating the performance of nickel-based welding materials for the welding manufacture of LNG storage tanks provided by the present invention, the performance tests on the nickel-based welding materials of LNG storage tanks include one or any combination of the following: wide plate tensile test, crack arrest test, fracture toughness test, welding and mechanical property test, product test plate test, critical value verification test.
[0007] According to the method for evaluating the performance of nickel-based welding materials for the welding manufacture of LNG storage tanks provided by the present invention, the wide plate tensile test is specifically: using the welding specimens, performing one or any combination of the following 6 groups or more at the thickest wall plate position of the LNG storage tank: vertical seam welding, circumferential seam welding, large fillet weld welding.
[0008] The large fillet weld is a circumferential weld at the bottom of the cylinder, which is much larger than the conventional fillet weld, so it is called the large fillet weld.
[0009] According to a method for evaluating the performance of nickel-based welding consumables for LNG storage tank welding and manufacturing provided by the present invention, the welding and mechanical property test is specifically as follows: using welding specimens, perform one or any combination of the following on the LNG storage tank for 26 groups or more: large fillet welding, butt welding of wall plates at vertical weld positions and circumferential weld positions, butt welding of the inner tank bottom ring plate, butt welding of the secondary bottom ring plate at the top reinforcement ring position and the TCP position (referring to the thermal corner protection position of the storage tank), butt welding of the top reinforcement ring, butt welding of the middle reinforcement ring, butt welding of the TCP with backing plate, fillet welding of the anchoring strip at the 2F, 3F, and 4F positions.
[0010] The 45° rotated specimen is represented by 1F (rotation), the vertically fixed horizontal welding specimen is represented by 2F, the horizontally rotated specimen is represented by 2FR (rotation), the vertically fixed overhead welding specimen is represented by 4F, and the horizontally fixed specimen is represented by 5F.
[0011] According to a method for evaluating the performance of nickel-based welding consumables for LNG storage tank welding and manufacturing provided by the present invention, the critical value verification test is specifically as follows: using welding specimens, perform one or any combination of the following on the LNG storage tank for 60 groups or more: large fillet welding, welding of the inner tank wall plate at the 2G and 3G positions, butt welding of the inner tank bottom ring plate at the 4G / 1G and 4G positions.
[0012] 1G represents a flat welding specimen, 2G represents a horizontal welding specimen, 3G represents a vertical welding specimen, and 4G represents an overhead welding specimen.
[0013] According to a method for evaluating the performance of nickel-based welding consumables for LNG storage tank welding and manufacturing provided by the present invention, the crack arrest test is specifically as follows: using welding specimens, perform the crack arrest test on the thickest wall plate position of the LNG storage tank for 4 groups or more; the fracture toughness test is specifically as follows: using welding specimens, perform the fracture toughness test on the thickest wall plate position of the LNG storage tank for 2 groups or more; the product test plate test is specifically as follows: weld 12 groups or more at the 2G and 3G positions of the welding specimens.
[0014] According to a method for evaluating the performance of nickel-based welding consumables for LNG storage tank welding and manufacturing provided by the present invention, non-destructive testing of the welding joints of nickel-based welding consumables for LNG storage tanks is achieved through the penetrant testing procedure and / or the radiographic testing procedure.
[0015] The present invention provides a method for evaluating the performance of nickel-based welding materials for LNG storage tank welding and manufacturing. The method prepares welding specimens from nickel-based welding materials for LNG storage tanks, and fully combines the performance test of nickel-based welding materials for LNG storage tanks and the performance test of nickel-based welding materials for LNG storage tanks to conduct a comprehensive evaluation of the welding specimens with different grooves, different thicknesses, and different welding positions. This method is conducive to screening nickel-based welding materials with qualified quality, ensuring the welding strength, safety and stability of nickel-based welding materials in LNG storage tank manufacturing projects, laying a technical foundation for the engineering application of domestic nickel-based welding materials for LNG storage tanks, and is expected to achieve independent control of key welding materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 A schematic flow chart of a method for evaluating the performance of nickel-based welding materials used in welding and manufacturing LNG storage tanks provided by the present invention.
[0018] Figure 2 This is the evaluation system diagram for the performance test of nickel-based welding materials for LNG storage tanks.
[0019] Figure 3 This is the overall design idea diagram for the wide plate tensile crack prevention test.
[0020] Figure 4 Figure 2 shows the tensile specimen of wide plate of welded joint.
[0021] Figure 5 This is the overall design idea diagram of the crack arrest test.
[0022] Figure 6 This is the picture of the crack arrest test specimen. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments, and they should not be understood as limitations on the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the description of the present invention, it should be understood that the terms used are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0024] Combine the followingFigures 1-6 Describe the method for evaluating the performance of nickel-based welding consumables used in the welding and manufacturing of LNG storage tanks provided by the present invention.
[0025] Figure 1 It is a schematic flow chart of the method for evaluating the performance of nickel-based welding consumables used in the welding and manufacturing of LNG storage tanks provided by the present invention. Refer to Figure 1 According to the present invention, a method for evaluating the performance of nickel-based welding consumables used in the welding and manufacturing of LNG storage tanks may include: Step S110: Prepare a welded specimen using the nickel-based welding consumables for the welding and manufacturing of LNG storage tanks; Step S120: Conduct performance tests on the welded specimen for nickel-based welding consumables of LNG storage tanks; Step S130: Conduct non-destructive testing on the welded joints of nickel-based welding consumables of LNG storage tanks for the welded specimen; Step S140: Obtain the evaluation result of the performance of nickel-based welding consumables for the welding and manufacturing of LNG storage tanks by integrating the performance test results of nickel-based welding consumables of LNG storage tanks and the performance test results of nickel-based welding consumables of LNG storage tanks.
[0026] In one embodiment, the performance tests on nickel-based welding consumables of LNG storage tanks include one or any combination of the following: wide plate tensile test, crack arrest test, fracture toughness (CTOD) test, welding and mechanical property test, product test plate test, critical value verification test, to test the wide plate tensile property, crack arrest property, fracture toughness property, welding and mechanical properties, etc. of nickel-based welding consumables of LNG storage tanks, which can comprehensively measure the quality of nickel-based welding consumables of LNG storage tanks and effectively improve the use safety and service life of LNG storage tanks.
[0027] In one embodiment, the wide plate tensile test is specifically as follows: Using the welded specimen, conduct one or any combination of the following 6 groups or more at the thickest wall plate position of the LNG storage tank: vertical seam welding, circumferential seam welding, large fillet weld. The large fillet weld is a weld around the bottom of the cylinder, which is much larger than the conventional fillet weld, so it is called a large fillet weld.
[0028] Regarding the wide plate tensile test of nickel-based welding consumables for LNG storage tank welding, the overall design concept is as Figure 2 and Figure 3, minimize the appearance of initial cracks during the construction process, and detect cracks approaching the critical size during the maintenance process. During the entire service life cycle, the cracks do not expand to the critical size and do not undergo rapid unstable propagation. At the position of the thickest tank wall steel plate with a thickness of 35.2 mm, one set of wide plate tensile tests is carried out for each welding method, and a total of 3 sets are carried out for vertical seam welding, circumferential seam welding, and large fillet welds, one set for each. Conduct deep-notch wide plate fracture tests on the welded joints at a specific temperature, and evaluate the crack initiation resistance of the welded joints by measuring the fracture toughness Kc value (the fracture toughness Kc value is directly obtained through wide plate tensile tests. If the index is not reached, it does not meet the requirements, and consider changing the element ratio to enhance the performance). The test temperature is -165 °C, the plate thickness specification is 35.2 mm, the welding materials and welding methods are vertical seams, circumferential seams, and large fillet welds, the joint form is a cross weld, the specimen size is plate thickness × 400 mm (parallel to the main weld direction) × 500 mm, and the number of specimens should be at least 2 specimens for each joint form. The specific form is shown in Figure 4 as shown. Each specification of steel plate should obtain at least 2 valid Kc data. If accurate evaluation of fracture performance is required, establish a large-size performance evaluation method. If supply inspection is required, establish a small-size fracture performance inspection method. Among them, the large-size fracture test is wide plate tensile, and the small-size fracture test is CTOD test.
[0029] The crack arrest test is specifically as follows: Use welded specimens to conduct 4 groups or more of crack arrest tests at the position of the thickest wall plate of the LNG storage tank.
[0030] Regarding the crack arrest test of nickel-based welding materials for LNG storage tanks, the overall design idea is shown in Figure 5 , where the crack arrest temperature is measured by a thermometer, and the high-strength steel thick plate used in the key parts of the structure must have the ability to prevent the propagation of brittle cracks, that is, the crack arrest ability. Take 4 specimens at the head or tail position of the thickest tank wall steel plate with a thickness of 35.2 mm to conduct a crack arrest test without temperature gradient at -165 °C. The specimen size is 500 mm × 700 mm, and the specific form is shown in Figure 6 as shown. Each thickness of steel plate specimens should obtain at least 2 valid data, and the crack lengths in the 2 valid data should be less than 500 mm, that is, the crack does not penetrate the entire specimen, meeting the crack arrest performance requirements. If accurate evaluation of crack arrest performance is required, establish a large-size crack arrest performance evaluation method. If supply inspection of crack arrest performance is required, establish a small-size crack arrest performance inspection method.
[0031] The fracture toughness test is specifically as follows: Use welded specimens to conduct 2 groups or more of fracture toughness tests at the position of the thickest wall plate of the LNG storage tank.
[0032] The welding and mechanical property test is specifically as follows: Using welding specimens, conduct 26 groups or more of one or any combination of the following on the LNG storage tank: large fillet welding, butt welding of wall plates at vertical and circumferential joints, butt welding of the inner tank bottom ring plate, butt welding of the secondary bottom ring plate at the top reinforcement ring position and the TCP position (referring to the thermal corner protection position of the storage tank), butt welding of the top reinforcement ring, butt welding of the middle reinforcement ring, butt welding of the TCP with backing plate, fillet welding of the anchor strip at the 2F, 3F, and 4F positions. Among them, the 45° rotated specimen is represented by 1F (rotation), the vertically fixed horizontal welding specimen is represented by 2F, the horizontally rotated specimen is represented by 2FR (rotation), the vertically fixed overhead welding specimen is represented by 4F, and the horizontally fixed specimen is represented by 5F.
[0033] Specifically, the welding and mechanical property test is specifically as follows: Using welding specimens, conduct physical and chemical property tests on the LNG storage tank at different groove types, different thicknesses, and different welding positions: large fillet welds (35.2 mm x 2 groups), butt welds of wall plates at vertical and circumferential joints (35.2 mm x 4 groups), butt welds of wall plates at vertical and circumferential joints (10 mm x 4 groups), butt welding of the inner tank bottom ring plate (22 mm x 2 groups), butt welding of the secondary bottom ring plate at the top reinforcement ring / TCP (12 mm x 2 groups), butt welding of the top reinforcement ring (20.2 mm x 2 groups), butt welding of the middle reinforcement ring (17.2 mm x 2 groups), butt welding of the TCP with backing plate (6 mm x 2 groups), fillet welds of the anchor strip at the 2F / 3F / 4F positions (40 mm x 2 groups). The physical and chemical property tests include but are not limited to tensile tests, bending tests, low-temperature impact tests, hardness tests, macrostructure tests, and non-destructive testing.
[0034] The product test plate test is specifically as follows: Weld 12 groups or more at the 2G and 3G positions of the welding specimen.
[0035] Specifically, the product test plate test is specifically as follows: Using welding specimens, conduct physical and chemical property tests at the 2G and 3G positions of the LNG storage tank respectively: 35.2 mm x 2 groups, 20.2 mm x 2 groups, 10 mm x 4 groups. The physical and chemical property tests include but are not limited to tensile tests, bending tests, low-temperature impact tests, hardness tests, and macrostructure tests.
[0036] The critical value verification test is specifically as follows: Using welding specimens, conduct 60 groups or more of one or any combination of the following on the LNG storage tank: large fillet welding, welding of the inner tank wall plates at the 2G and 3G positions, butt welding of the inner tank bottom ring plate at the 4G / 1G and 4G positions. 1G represents the flat welding specimen, 2G represents the horizontal welding specimen, 3G represents the vertical welding specimen, and 4G represents the overhead welding specimen.
[0037] Specifically, the critical value verification tests include but are not limited to the physical and chemical property tests of large fillet welds (35.2 mm x 10 groups), inner tank wall plates at the 2G position (35.2 mm x 10 groups), inner tank wall plates at the 3G position (35.2 mm x 10 groups), butt joints of the inner tank bottom ring plates at the 1G + 4G position (20.2 mm x 5 groups), butt joints of the inner tank bottom ring plates at the 4G position (20.2 mm x 5 groups), inner tank wall plates at the 2G position (10 mm x 10 groups), and inner tank wall plates at the 3G position (10 mm x 10 groups). The physical and chemical property tests include but are not limited to tensile tests, bending tests, low-temperature impact tests, hardness tests, macrostructure tests, and non-destructive testing.
[0038] Regarding the -196°C low-temperature impact test for the welding of nickel-based welding consumables in LNG storage tanks, each group of specimens shall consist of 3 specimens. The lateral expansion of each specimen of 06Ni9DR steel and stainless steel shall not be less than 0.38 mm. The specimens of 06Ni9DR shall be of the largest possible size. When standard specimens of 10 x 10 mm can be obtained, small-sized specimens shall not be used. The notch of the small-sized specimen is located longitudinally on the narrow side, making the notch perpendicular to the surface of the base metal. For plates with a thickness of 6 - 10 mm, specimens of 5 x 10 mm are used, and the conversion coefficient is 0.5. For materials with a thickness less than 6 mm, impact tests are not conducted. Only one test value of the impact energy of the 3 standard specimens is allowed to be lower than the average value, and it shall not be less than 80% of the specified value.
[0039] Regarding the bending test for the welding of nickel-based welding consumables in LNG storage tanks, the axial direction of the bending specimen shall be perpendicular to the rolling direction of the steel plate. For the transverse bending test, the specimen width W = 2t, but not less than 20 mm, where t is the thickness of the steel plate, and the bend diameter D = 3t. When t > 25 mm, it is allowed to machine the thickness of the specimen to 25 mm and retain one original surface on one side. During the bending test, the original surface retained on the specimen shall be on the side of tensile deformation, and a 180° bend at room temperature is required without cracks.
[0040] Regarding the hardness test for the welding of nickel-based welding consumables in LNG storage tanks, if flame cutting is used for the prefabrication of 06Ni9DR steel plates, the hardness of the edges needs to be detected, and the maximum HV10 hardness shall not exceed 400.
[0041] Regarding the metallographic test for the welding of nickel-based welding consumables in LNG storage tanks, the sampling direction of the specimen is perpendicular to the cross-section of the weld axis, and the specimen includes the weld deposited metal and the heat-affected zones on both sides of the weld.
[0042] Regarding the visual inspection for the welding of nickel-based welding consumables in LNG storage tanks, the completed welds and the welds after post-weld heat treatment need to be visually inspected and an inspection report shall be issued.
[0043] Regarding the crack tip opening displacement test of nickel-based welding consumables for LNG storage tanks, a 35.2-mm steel plate with the largest wall thickness of the tank was selected. Two groups of specimens were taken from the head or tail of two different steel plates respectively, and the crack tip opening displacement (CTOD) test was carried out at -163°C (±5°C). The test results (δm or δu) were greater than or equal to 0.30 mm. The CTOD test was carried out in accordance with GB / T 21143, and the detection standard of CTOD was ≥0.3 mm.
[0044] In one embodiment, non-destructive testing of the welded joints of nickel-based welding consumables for LNG storage tanks can be achieved through a penetrant testing procedure and / or a radiographic testing procedure.
[0045] Penetrant testing technology is a non-destructive testing technology based on the principle of capillary action, mainly used to detect surface opening defects of non-porous metal or non-metal components. During testing, a penetrant solution containing a fluorescent dye or a coloring dye is applied to the surface of the component. Due to capillary action, the penetrant seeps into the small surface opening defects. After removing the excess penetrant adhering to the surface of the workpiece, a developer is applied after drying. The penetrant in the defects is re-adsorbed onto the surface of the component under the action of capillary phenomenon, forming an enlarged defect display, and the morphology and distribution state of the defects can be detected.
[0046] Radiographic testing: If there are defects in a local area of the workpiece, it will change the attenuation of the ray by the object, causing a change in the intensity of the transmitted ray. In this way, by using a certain detection method, such as using film sensitization to detect the intensity of the transmitted ray, it is possible to judge whether there are defects in the workpiece and the location and size of the defects.
[0047] Regarding the penetrant inspection of nickel-based welding consumables for LNG storage tanks, 100% PT testing was carried out on the plate butt joint test and the fillet weld specimens. The detection method for penetrant testing was solvent-removable color penetrant testing.
[0048] Regarding the radiographic inspection of nickel-based welding consumables for LNG storage tanks, 100% RT testing was carried out on the plate butt joint specimens. RT should be carried out after the welding and visual inspection are qualified. RT uses X-rays and adopts the double-film technique. The radiographic film should be KODAK MX125, AGFA C4 or D4. The width of the film after RT imaging should be able to cover the entire weld and the heat-affected zone. The width of the single-sided heat-affected zone should not be less than 10 mm, and the effective length of the film should not be greater than 400 mm. RT should use a lead intensifying screen and fluorescent intensifying screens are prohibited. RT should use an X-ray machine with a maximum focal spot size of 2.5 mm x 2.5 mm.
[0049] The nickel-based welding materials that have passed the inspection are assembled according to the assembly gap, assembly blunt edge and welding position required by the welding process assessment plan. Before assembly, the surface of the assessment specimen is polished evenly and smoothly on both sides of the groove and within 20~30mm of the groove surface to ensure that there is no scaling, cracks, rust, slag inclusions, grease and other substances that affect the welding quality.
[0050] For welding specimens that need to be preheated for large LNG storage tanks, it is not allowed to use gas cutting torches for residual heat. Electric heating or baking torches can be used for preheating. Welding rods must not be used if they are exposed to the air for more than 4 hours. After the welding specimens are prepared, the welder and welding inspector need to mark them, including PQR number, welding position, specimen size, welder number, etc.
[0051] The weld of the LNG storage tank is the weakest link in the structure, and nickel-based welds with good performance are required to ensure the safety of the structure. The quality of welding materials directly determines the quality of welds and welded joints, which in turn affects the service life of the LNG storage tank. The welding performance is affected by factors such as the parent material component, the welding material component, and the magnetic blow phenomenon that nickel-based metal welding is prone to. It is difficult to formulate a reasonable welding process, and the quality of nickel-based welding materials is a key issue. The present invention uses the CTOD test to evaluate the brittle fracture resistance of nickel-based welding materials for LNG storage tanks, and uses a wide plate tensile test to evaluate the performance of nickel-based welding materials for LNG storage tanks during the entire life cycle. The crack does not expand to a critical size and does not undergo rapid instability and expansion. The crack arrest test is used to evaluate whether the steel plates used in the key parts of nickel-based welding materials for LNG storage tanks have the performance of preventing brittle crack expansion, etc., which can effectively ensure the quality, safety and stability of nickel-based welding materials in the application of LNG storage tank manufacturing projects.
[0052] In this embodiment, when the performance test results of nickel-based welding materials for LNG storage tanks and the performance test results of nickel-based welding materials for LNG storage tanks are both qualified, the performance evaluation results of nickel-based welding materials used for LNG storage tank welding manufacturing are judged to be qualified, otherwise they are unqualified.
[0053] The present invention provides a method for evaluating the performance of nickel-based welding materials for LNG storage tank welding and manufacturing. The method prepares welding specimens from nickel-based welding materials for LNG storage tanks, and fully combines the performance test of nickel-based welding materials for LNG storage tanks and the performance test of nickel-based welding materials for LNG storage tanks to conduct a comprehensive evaluation of the welding specimens with different grooves, different thicknesses, and different welding positions. This method is conducive to screening nickel-based welding materials with qualified quality, ensuring the welding strength, safety and stability of nickel-based welding materials in LNG storage tank manufacturing projects, laying a technical foundation for the engineering application of domestic nickel-based welding materials for LNG storage tanks, and is expected to achieve independent control of key welding materials.
[0054] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.
[0055] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.
[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for evaluating the performance of nickel-based welding consumables used in the welding manufacture of LNG storage tanks, characterized in that, Including: Preparing a welded specimen by using a nickel-based welding consumable for the welded fabrication of an LNG storage tank; Conducting performance tests on the nickel-based welding consumables for the LNG storage tank for the welded specimen; Conducting non-destructive testing on the welded joints of the nickel-based welding consumables for the LNG storage tank for the welded specimen; Obtaining the performance evaluation result of the nickel-based welding consumables for the welded fabrication of the LNG storage tank by comprehensively considering the performance test results of the nickel-based welding consumables for the LNG storage tank and the performance test results of the nickel-based welding consumables for the LNG storage tank.
2. The performance evaluation method of nickel-based welding consumables for LNG storage tank welding and manufacturing according to claim 1, wherein The performance tests on the nickel-based welding consumables for the LNG storage tank include one or any combination of the following: wide plate tensile test, crack arrest test, fracture toughness test, welding and mechanical property test, product test plate test, critical value verification test.
3. The performance evaluation method of nickel-based welding consumables for LNG storage tank welding and manufacturing according to claim 2, wherein, The wide plate tensile test is specifically as follows: using the welded specimen, at the thickest wall plate position of the LNG storage tank, conducting one or any combination of the following for 6 groups or more: vertical seam welding, circumferential seam welding, large fillet weld welding.
4. The performance evaluation method of nickel-based welding consumables for LNG storage tank welding and manufacturing according to claim 2, characterized in that The welding and mechanical property test is specifically as follows: using the welded specimen, on the LNG storage tank, conducting one or any combination of the following for 26 groups or more: large fillet weld welding, butt welding of wall plates at the vertical seam position and the circumferential seam position, butt welding of the inner tank bottom ring plate, butt welding of the secondary bottom ring plate at the top reinforcement ring position and the thermal corner protection position of the storage tank, butt welding of the top reinforcement ring, butt welding of the intermediate reinforcement ring, butt welding of the TCP backing plate, fillet weld welding of the anchor strip at the 2F, 3F, 4F positions.
5. The performance evaluation method of nickel-based welding consumables for LNG storage tank welding and manufacturing according to claim 2, wherein, The critical value verification test is specifically as follows: using the welded specimen, on the LNG storage tank, conducting one or any combination of the following for 60 groups or more: large fillet weld welding, welding of the inner tank wall plate at the 2G and 3G positions, butt welding of the inner tank bottom ring plate at the 4G / 1G and 4G positions.
6. The method for evaluating the performance of nickel-based welding consumables for LNG storage tank welding and manufacturing according to claim 2, characterized in that, The crack arrest test is specifically as follows: using the welded specimen, conducting the crack arrest test for 4 groups or more at the thickest wall plate position of the LNG storage tank; the fracture toughness test is specifically as follows: using the welded specimen, conducting the fracture toughness test for 2 groups or more at the thickest wall plate position of the LNG storage tank; the product test plate test is specifically as follows: welding 12 groups or more at the 2G and 3G positions of the welded specimen.
7. The performance evaluation method of nickel-based welding consumables for LNG storage tank welding and manufacturing according to claim 1, characterized in that The non-destructive testing of the welded joints of the nickel-based welding consumables for the LNG storage tank is achieved through the penetrant testing procedure and / or the radiographic testing procedure.