CN116577420B - Manufacturing method of unfused defect of special dissimilar steel welding joint simulation test block for thermal power - Google Patents
Manufacturing method of unfused defect of special dissimilar steel welding joint simulation test block for thermal power Download PDFInfo
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- CN116577420B CN116577420B CN202310577941.0A CN202310577941A CN116577420B CN 116577420 B CN116577420 B CN 116577420B CN 202310577941 A CN202310577941 A CN 202310577941A CN 116577420 B CN116577420 B CN 116577420B
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- 230000007547 defect Effects 0.000 title claims abstract description 146
- 238000003466 welding Methods 0.000 title claims abstract description 145
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 36
- 239000010959 steel Substances 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000004088 simulation Methods 0.000 title claims abstract description 25
- 238000005520 cutting process Methods 0.000 claims abstract description 31
- 238000005530 etching Methods 0.000 claims abstract description 22
- 239000011229 interlayer Substances 0.000 claims abstract description 6
- 238000003754 machining Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 241001016380 Reseda luteola Species 0.000 description 25
- 239000000463 material Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 229910000734 martensite Inorganic materials 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- NGONBPOYDYSZDR-UHFFFAOYSA-N [Ar].[W] Chemical compound [Ar].[W] NGONBPOYDYSZDR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a manufacturing method of an unfused defect of a special dissimilar steel welding joint simulation test block for thermal power, which belongs to the technical field of manufacturing of defect test plates and is characterized by comprising the following steps: (1) Manufacturing simulated surface unfused defects, simulated interlayer unfused defects and simulated root unfused defects according to the number and the positions of the preset unfused defects, and machining a cut at the to-be-welded part of a pair of dissimilar steel plate weldments; (2) Performing defect-free welding, and stopping welding when the welding thickness reaches 1/2 of the thickness of the workpiece or other interlayer positions; (3) processing the surface of the welding seam to smooth the surface of the welding seam; (4) And etching the groove defect from the top surface of the welding line to the bottom of the cutting line at the joint surface of the cutting line and the welding line, and placing a welding wire above the groove defect after etching to obtain an unfused defect, so as to achieve the effect of more accurately controlling the size of the unfused defect in the simulation test block.
Description
Technical Field
The invention relates to the field of manufacturing of defect test plates, in particular to a manufacturing method of an unfused defect of a special dissimilar steel welding joint simulation test block for thermal power.
Background
With the increase of various devices and materials, the combined application among different materials is becoming more common, and especially the welding of dissimilar steel materials has shown an increasing trend over the years. However, different kinds of steel materials have obvious differences in physical, chemical and other characteristics, so that the dissimilar steel materials can be subjected to welding problems in the butt joint process.
The welding seam between dissimilar steels must be subjected to 100% nondestructive test, and a simulation test block must be adopted to verify the welding seam before the dissimilar steel welding seam is detected according to national detection standard, so that the dissimilar steel welding seam has different welding performances due to different materials of a base metal and the welding seam, groove unfused defects are easy to occur during welding, the hazard degree of the unfused defects is equivalent to that of cracks, and the welding seam burst is easy to occur. The field unfused defects are mostly narrow, if the detection sensitivity is not enough, the detection omission is easily caused, at present, the domestic unfused defects are manually welded, and small current is deliberately discharged during welding, but the unfused defects made by the method are larger and the size is difficult to control; the defect size in the simulation test block has strict requirements in national standard, especially in the detection of in-service weld joints, for example, the technical standard of NB/T47013.15 ultrasonic phased array detection does not allow the defect size of the simulation test block to exceed the level 2 of acceptance grade, such as a weld joint with the thickness of 8mm, the defect length in the simulation test block cannot exceed 8mm, the defect self-height cannot exceed 1mm, and the manual welding of the size is difficult to realize.
Therefore, the control of the defect size in the simulation test block is the key of the quality detection of the dissimilar steel welding line.
Disclosure of Invention
In order to more accurately control the size of the unfused defect in the simulation test block, the invention provides a manufacturing method of the unfused defect of the special dissimilar steel welding joint simulation test block for thermal power.
The invention provides a manufacturing method of an unfused defect of a special dissimilar steel welding joint simulation test block for thermal power, which adopts the following technical scheme:
a manufacturing method of an unfused defect of a special dissimilar steel welding joint simulation test block for thermal power comprises the following steps:
(1) Manufacturing unfused defects according to the number and the positions of the preset unfused defects, and machining a cut at the to-be-welded part of a pair of dissimilar steel plate weldments;
(2) Performing defect-free welding, and stopping welding when the welding thickness reaches 1/2 of the thickness of the workpiece or other interlayer positions;
(3) Processing the surface of the welding seam to smooth the surface of the welding seam;
(4) And etching the groove defect from the top surface of the welding line to the bottom of the welding line at the joint surface of the cutting line and the welding line by adopting an EDM grooving technology, wherein the diameter of the electrode wire is 0.2mm, the simulated unfused defect with the width of 0.2+/-0.05 mm is etched, the length and the depth of the simulated defect are in reference with the defect size specified by the NB/T47013.3 standard, and a welding wire is placed above the groove defect to be welded to obtain the unfused defect after the etching is finished, wherein the diameter of the welding wire is smaller than the diameter of the tip of the welding electrode and larger than the width of the simulated unfused defect, and the length of the welding wire is larger than the length of the simulated defect.
Preferably, argon tungsten-arc welding is adopted in the step (4), the diameter of the tip end of the welding electrode is less than or equal to 1mm, 1G flat welding is adopted, the welding current is 10-40A, intermittent welding is adopted by the welding, pulse peak base value is adopted, the welding is linearly reciprocated, and the included angle of a welding gun is 60 degrees.
Preferably, the wire length is greater than 8-12% of the simulated defect length.
Preferably, the location of the unfused defect includes an unfused defect of the weld surface, an unfused defect at the middle cut of the weld (which may also be referred to as an interlayer unfused defect), and an unfused defect at the root of the weld.
Preferably, the manufacturing method of the unfused defect at the root of the welding seam is as follows: and (3) enabling the bottom of the cutting opening to face upwards, enabling the cutting opening surface to be perpendicular to the ground, etching groove defects along the cutting opening surface from the bottom of the cutting opening to the top of the cutting opening, etching the simulated unfused defects with the width of 0.2+/-0.05 mm by the diameter of the electrode wire, and obtaining the unfused defects at the root of the welding seam after the length and the depth of the simulated defects are in accordance with the defect sizes specified by the NB/T47013.3 standard.
Preferably, the manufacturing method of the unfused defect on the surface of the welding line comprises the following steps: and after the manufacture of the unfused defect at the middle cutting opening of the welding line is finished, continuing to weld upwards until the cutting opening surface is perpendicular to the ground after the welding at the cutting opening is finished, etching the groove defect from the top to the bottom of the cutting opening along the cutting opening surface, wherein the diameter of the electrode wire is 0.2mm, etching the simulated unfused defect with the width of 0.2+/-0.05 mm, and etching the simulated unfused defect with the length and depth of the simulated defect according to the defect size specified by the NB/T47013.3 standard to obtain the unfused defect on the surface of the welding line.
In summary, the invention has the following beneficial effects:
the invention aims to develop a special dissimilar steel weld joint simulation test block for a thermal power plant, because the dissimilar steel weld joint is formed by welding martensitic steel and stainless steel through a Ni-based welding material, the largest defects appear on site, namely, unfused defects at two side cutting openings of the weld joint, therefore, the positions of the unfused defects are arranged on the surface of the weld joint, the middle cutting opening of the weld joint and the root of the weld joint, and basically represent the defect positions after the actual dissimilar steel is welded, so that the dissimilar steel weld joint can be accurately verified when the simulation test block obtained by the invention is utilized, the manufacturing of the unfused defects is realized by adopting the combination of defect etching and repair welding, the accurate control of the simulated defect size of the dissimilar steel weld joint is realized, a welding wire is placed above the groove, the relation between the diameter of the welding wire and the tip diameter of a welding electrode and the diameter of the electrode and the length of the simulated defects is limited, and the relationship between the length of the welding wire and the simulated defect is realized by adopting the defect etching and the defect forming method, and the manufacturing of the dissimilar steel weld joint simulation test block is realized by adopting the method of the invention, and the defect manufacturing method of the invention is realized by adopting the melt as the position of the unfused defect to be in the range of the unfused defect manufacturing accuracy.
Since the post-weld and pre-weld locations are effectively joined together during the welding process, the welded seam will also partially melt. According to the invention, when the diameter of the welding wire is smaller than the diameter of the tip of the welding electrode and the diameter of the welding wire is 8-12% of the diameter of the electrode wire, and the length of the welding wire is 8-12% of the length of the simulated defect, the welding wire can be ensured to be melted in the welding process, and the etched groove can not be damaged, so that the size of the unfused defect can be effectively ensured, the unfused defect still exists after the welding is finished, and the requirement in the standard is met. In addition, when the diameter of the welding wire is larger than the extreme diameter of the welding electrode, the melting time of the welding wire can be prolonged, meanwhile, the welding current is also larger than 40A, when the welding current is too large, operators can shake in the welding process, further, the situation that the edges of groove defects below the welding wire are molten can be caused, the size of the unfused defects is irregular can be caused, when the diameter of the welding wire is too small, the melted welding wire is easy to infiltrate into the groove defects, the size of the unfused defects is not in accordance with the requirements in the standard, and therefore the accuracy of welding seam detection can be affected.
Drawings
FIG. 1 is a schematic view of the structure of unfused defects at different locations and depths.
Fig. 2 is a schematic diagram of the structure before and after machining in step (21).
FIG. 3 is a schematic view of the structure of the wire position at step (22).
FIG. 4 is a schematic illustration of the structure of an unfused defect at the weld surface and an unfused defect at the weld root.
Reference numerals illustrate:
1. unfused defects on the weld surface; 2. unfused defects on the weld surface; 3. an unfused defect at a middle split of the weld; 4. an unfused defect at a middle split of the weld; 5. an unfused defect at the root of the weld; 6. an unfused defect at the root of the weld; 7. a groove; 8. and (5) welding wires.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention aims to develop a special dissimilar steel welding seam simulation test block for a thermal power plant, wherein the dissimilar steel welding seam of the thermal power plant is formed by welding martensitic steel and stainless steel through a Ni-based welding material, and the largest defects occur on site are unfused defects at the cut-open parts at two sides of the welding seam, so that six unfused defects are customized according to the characteristics, 1 and 2 represent unfused defects of two welding seam surfaces, 3 and 4 represent unfused defects at the cut-open part in the middle of the two welding seams, 5 and 6 are unfused defects at the root parts of the two welding seams, and specific positions and depths are shown by referring to FIG. 1. The specific manufacturing method for the unfused defects in the simulation test block comprises the following steps:
a manufacturing method of an unfused defect of a special dissimilar steel welding joint simulation test block for thermal power comprises the following steps:
(1) After the to-be-welded parts of the martensitic steel and the stainless steel are machined and cut, forming a group to form a to-be-welded part;
(2) Firstly, manufacturing an unfused defect at a middle cutting opening of a welding line:
(21) Firstly, normal defect-free welding is carried out at the cut of a piece to be welded, when the thickness of the welding reaches one half of the thickness of a workpiece or other interlayer positions, the welding work is stopped, at the moment, the surface of a welding line is uneven, and the surface of the welding line is leveled by adopting a machining mode, as shown in figure 2;
(22) At this time, rotating the test block to enable one cutting surface to be perpendicular to the ground, then etching a vertical groove from the top surface of the welding line to the bottom of the cutting line on the abutting surface of the cutting surface and the welding line by adopting an EDM grooving technology, wherein the width of the groove is 0.2+/-0.05 mm, the length and the depth of the groove defect are regulated by referring to the defect size regulated by the NB/T47013.3 standard, after the groove defect is etched, in order to ensure that the groove defect is not melted in the following welding process, placing a welding wire with the diameter of 0.6mm above the groove defect, as shown in fig. 3, then adopting tungsten argon arc welding, the tip diameter of a welding electrode is 1mm, the diameter of the electrode wire is 0.2mm, adopting 1G flat welding, adopting a high-frequency welding machine for welding, and adopting pulse peak-based value intermittent welding, and linearly and reciprocally swinging, wherein the welding gun included angle is 60 degrees;
(3) The manufacturing method of the unfused defect on the surface of the welding line comprises the following steps: as shown in fig. 4, after the manufacture of the unfused defect at the middle cut of the welding line is completed, continuing to build up welding to the top of the cut until the whole cut is welded, rotating the steel plate welding piece so that one cut surface is perpendicular to the ground, etching a vertical groove along the cut surface from the top of the welding line to the bottom of the cut by adopting an EDM grooving technology, wherein the diameter of a wire electrode is 0.2mm, etching a simulated unfused defect with the width of 0.2+/-0.05 mm to form a simulated unfused defect on the surface of the welding line, and the length and depth of the simulated defect refer to the defect size specified by the NB/T47013.3 standard;
(4) The manufacture mode of the unfused defect at the root of the welding line is as follows: as shown in fig. 4, the steel plate welded part was rotated so that the bottom of the split was upward and one of the split surfaces was perpendicular to the ground, vertical groove defects were etched by EDM grooving technique from the bottom of the split to the top of the split along the split surface, the wire electrode diameter was 0.2mm, a simulated unfused defect having a width of 0.2±0.05mm was etched, the simulated defect length and depth were referenced to the defect size specified by NB/T47013.3 standard, and the unfused defect at the root of the weld was obtained after the etching was completed.
The embodiments of the present invention are all preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (5)
1. The manufacturing method of the unfused defect of the special dissimilar steel welding joint simulation test block for the thermal power is characterized by comprising the following steps of:
(1) Manufacturing unfused defects according to the number and the positions of the preset unfused defects, and machining a cut at the to-be-welded part of a pair of dissimilar steel plate weldments;
(2) Performing defect-free welding, and stopping welding when the welding thickness reaches 1/2 of the thickness of the workpiece or other interlayer positions;
(3) Processing the surface of the welding seam to smooth the surface of the welding seam;
(4) And etching the groove defect from the top surface of the welding seam to the bottom of the cutting seam at the joint surface of the cutting seam and the welding seam by adopting an EDM grooving technology, wherein the diameter of a wire electrode is 0.2mm, the simulated unfused defect with the width of 0.2+/-0.05 mm is etched, the length and the depth of the simulated defect are in accordance with the defect size specified by the NB/T47013.3 standard, and a welding wire is placed above the groove defect to be welded after the etching is finished, so that the unfused defect is obtained, wherein the diameter of the welding wire is smaller than the diameter of the tip of a welding electrode and larger than the width of the simulated unfused defect, and the length of the welding wire is larger than 8-12% of the length of the simulated defect.
2. The method for manufacturing the unfused defect of the thermal power special dissimilar steel welding joint simulation test block, which is disclosed in claim 1, is characterized in that: in the step (4), argon tungsten-arc welding is adopted, the diameter of the tip end of a welding electrode is less than or equal to 1mm, 1G flat welding is adopted, the welding current is 10-40A, intermittent welding with pulse peak base value is adopted, the welding is linearly reciprocated, and the included angle of a welding gun is 60 degrees.
3. The method for manufacturing the unfused defect of the thermal power special dissimilar steel welding joint simulation test block, which is disclosed in claim 1, is characterized in that: the positions of the unfused defects comprise unfused defects on the surface of the welding line, unfused defects at the middle cut of the welding line and unfused defects at the root of the welding line.
4. The method for manufacturing the unfused defect of the thermal power special dissimilar steel welding joint simulation test block, which is disclosed in claim 3, is characterized in that: the manufacturing mode of the unfused defect at the root of the welding line is as follows: and (3) enabling the bottom of the cutting opening to face upwards, enabling the cutting opening surface to be perpendicular to the ground, etching groove defects along the cutting opening surface from the bottom of the cutting opening to the top of the cutting opening, etching the simulated unfused defects with the width of 0.2+/-0.05 mm by the diameter of the electrode wire, and obtaining the unfused defects at the root of the welding seam after the length and the depth of the simulated defects are in accordance with the defect sizes specified by the NB/T47013.3 standard.
5. The method for manufacturing the unfused defect of the thermal power special dissimilar steel welding joint simulation test block, which is disclosed in claim 3, is characterized in that: the manufacturing mode of the unfused defect on the surface of the welding line is as follows: and after the manufacture of the unfused defect at the middle cutting opening of the welding line is finished, continuing to weld upwards until the cutting opening surface is perpendicular to the ground after the welding at the cutting opening is finished, etching the groove defect from the top to the bottom of the cutting opening along the cutting opening surface, wherein the diameter of the electrode wire is 0.2mm, etching the simulated unfused defect with the width of 0.2+/-0.05 mm, and obtaining the unfused defect on the surface of the welding line after the etching is finished by referring to the defect size specified by the NB/T47013.3 standard for the length and the depth of the simulated defect.
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| CN218272134U (en) * | 2022-09-23 | 2023-01-10 | 西安热工研究院有限公司 | Simulation test block for ultrasonic single-sided and single-sided detection of incomplete fusion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103264209A (en) * | 2013-04-26 | 2013-08-28 | 中国化学工程第三建设有限公司 | Combine-welding method of stainless steel welded parts |
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| CN116577420A (en) | 2023-08-11 |
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