CN117108834A - Corrosion-resistant assembly and preparation method thereof - Google Patents
Corrosion-resistant assembly and preparation method thereof Download PDFInfo
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- CN117108834A CN117108834A CN202311378333.3A CN202311378333A CN117108834A CN 117108834 A CN117108834 A CN 117108834A CN 202311378333 A CN202311378333 A CN 202311378333A CN 117108834 A CN117108834 A CN 117108834A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 375
- 238000005260 corrosion Methods 0.000 title claims abstract description 375
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 320
- 230000007704 transition Effects 0.000 claims abstract description 169
- 239000002131 composite material Substances 0.000 claims abstract description 98
- 230000008878 coupling Effects 0.000 claims abstract description 97
- 238000010168 coupling process Methods 0.000 claims abstract description 97
- 238000005859 coupling reaction Methods 0.000 claims abstract description 97
- 239000010410 layer Substances 0.000 claims description 323
- 239000000463 material Substances 0.000 claims description 154
- 229910001220 stainless steel Inorganic materials 0.000 claims description 44
- 239000010935 stainless steel Substances 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 28
- 238000003825 pressing Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 22
- 229910045601 alloy Inorganic materials 0.000 claims description 20
- 239000000956 alloy Substances 0.000 claims description 20
- 239000011229 interlayer Substances 0.000 claims description 16
- 238000005219 brazing Methods 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052721 tungsten Inorganic materials 0.000 claims description 8
- 239000010937 tungsten Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000003475 lamination Methods 0.000 abstract 1
- 239000011324 bead Substances 0.000 description 15
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- 229910000975 Carbon steel Inorganic materials 0.000 description 8
- 239000010962 carbon steel Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000004021 metal welding Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 102220498074 Transmembrane 4 L6 family member 20_N80Q_mutation Human genes 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/182—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for screw-threaded joints
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a corrosion-resistant component and a preparation method thereof, and relates to the technical field of petrochemical devices, wherein the corrosion-resistant component comprises a bimetal composite pipe and a coupling which can be connected with the bimetal composite pipe through threads; the bimetal composite pipe comprises a bimetal composite pipe body, wherein the end surfaces of the two ends of the bimetal composite pipe are provided with a first corrosion-resistant transition layer and a first corrosion-resistant surfacing layer in a lamination mode; the coupling comprises a coupling body, wherein a second corrosion-resistant transition layer and a second corrosion-resistant surfacing layer are arranged on the inner wall of the middle area in a surrounding manner; when the bimetal composite pipe is connected with the coupling through threads, the first corrosion-resistant surfacing layer is abutted against the second corrosion-resistant surfacing layer; welding current for welding the first corrosion-resistant transition layer and the second corrosion-resistant transition layer is 120-180A, and welding voltage is 10-12V; the welding current of the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer is 220-240A, and the welding voltage is 13-16V. The joint of the bimetal composite pipe and the coupling has strong corrosion resistance.
Description
Technical Field
The invention relates to the technical field of petrochemical devices, in particular to a corrosion-resistant component and a preparation method thereof.
Background
In the development process of oil and gas fields, because the natural environment is complex and changeable, and the development of the oil and gas fields at present enters into the exploitation stage of coexistence of various high and new technologies, new challenges are presented to the corrosion resistance of an oil and gas well string (the oil pipe is screwed with a coupling with internal threads through external threads, and thus a plurality of oil pipes are connected through the coupling to form the oil and gas well string). At present, many users begin to choose to use a bimetal composite pipe with lower cost (generally, the outer layer is made of carbon steel, and the inner layer is made of corrosion-resistant materials) for corrosion prevention, and the bimetal composite pipe has low cost and corrosion resistance, but the corrosion resistance of the joint connection part of the bimetal composite pipe and the coupling is still poor and unstable, so that the bimetal composite pipe faces serious risk hidden trouble and is a serious problem to be solved in the industry.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a corrosion-resistant component and a preparation method thereof, and aims to solve the problem that the corrosion resistance of the joint connection part of the conventional bimetal composite pipe and a coupling is poor.
The technical scheme of the invention is as follows:
In a first aspect of the invention, a corrosion resistant assembly is provided, comprising a bimetallic composite tube and a collar threadably connectable to the bimetallic composite tube;
the bimetal composite pipe comprises:
a bimetal composite pipe body;
the first corrosion-resistant transition layers are arranged on the end surfaces of the two ends of the bimetal composite pipe body;
the first corrosion-resistant surfacing layer is arranged on the first corrosion-resistant transition layer;
the coupling comprises:
a coupling body;
the second corrosion-resistant transition layer is annularly arranged on the inner wall of the middle area of the coupling body;
the second corrosion-resistant surfacing layer is arranged on the second corrosion-resistant transition layer;
when the bimetal composite pipe is connected with the coupling through threads, the first corrosion-resistant surfacing layer is propped against the second corrosion-resistant surfacing layer;
the first corrosion-resistant transition layer, the first corrosion-resistant surfacing layer, the second corrosion-resistant transition layer and the second corrosion-resistant surfacing layer are all prepared by adopting non-melt inert gas tungsten electrode shielded welding;
the same stainless steel welding wire is adopted for preparing the first corrosion-resistant transition layer by welding and preparing the second corrosion-resistant transition layer by welding; the same stainless steel welding wire is adopted for preparing the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer by welding;
The total content of alloy elements of the stainless steel welding wires adopted by the first corrosion-resistant transition layer and the second corrosion-resistant transition layer is higher than or equal to that of the stainless steel welding wires adopted by the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer;
the welding process parameters of the first corrosion-resistant transition layer prepared by welding and the second corrosion-resistant transition layer prepared by welding are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 120-180A, and the welding voltage is 10-12V;
the welding process parameters of the first corrosion-resistant surfacing layer prepared by welding and the second corrosion-resistant surfacing layer prepared by welding are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 220-240A, and the welding voltage is 13-16V.
In a second aspect of the present invention, there is provided a method of manufacturing a corrosion resistant assembly, wherein the corrosion resistant assembly comprises a bimetal composite pipe and a collar capable of being screwed with the bimetal composite pipe, the method of manufacturing the corrosion resistant assembly comprising the steps of:
providing a bimetal composite pipe blank, adopting non-melt electrode inert gas tungsten electrode protection welding, setting the interlayer temperature to be not more than 250 ℃, preheating at 120-200 ℃, and welding a first corrosion-resistant transition material layer on the end surfaces of two ends of the bimetal composite pipe blank; then setting the interlayer temperature to be not more than 200 ℃, and welding a first corrosion-resistant welding material layer on the first corrosion-resistant transition material layer at room temperature; external threads are machined on the surfaces of two ends of the bimetal composite pipe blank to obtain the bimetal composite pipe, wherein the bimetal composite pipe comprises a bimetal composite pipe body, and a first corrosion-resistant transition layer and a first corrosion-resistant surfacing layer which are sequentially laminated on the end surfaces of two ends of the bimetal composite pipe body;
Providing a coupling prefabricated member with a groove formed on the inner wall of the middle area in a ring manner;
adopting non-consumable electrode inert gas tungsten electrode protection welding, setting the interlayer temperature to be not more than 250 ℃, preheating at 120-200 ℃, welding a second corrosion-resistant transition material layer in the groove, setting the interlayer temperature to be not more than 200 ℃, and welding a second corrosion-resistant welding material layer on the second corrosion-resistant transition material layer; processing internal threads on two sides of the second corrosion-resistant welding material layer to obtain the coupling, wherein the coupling comprises a coupling body, and a second corrosion-resistant transition layer and a second corrosion-resistant welding overlay which are stacked on the inner wall of the middle area of the coupling body;
the welding first corrosion-resistant transition material layer and the welding second corrosion-resistant transition material layer adopt the same stainless steel welding wire;
the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer are welded by adopting the same stainless steel welding wire;
the total content of alloy elements of the stainless steel welding wires used for welding the first corrosion-resistant transition material layer and the second corrosion-resistant transition material layer is higher than or equal to that of the stainless steel welding wires used for welding the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer;
The welding technological parameters of the first corrosion-resistant transition material layer and the second corrosion-resistant transition material layer are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 120-180A, and the welding voltage is 10-12V;
the welding technological parameters of the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 220-240A, and the welding voltage is 13-16V;
when the bimetal composite pipe is connected with the coupling through threads, the first corrosion-resistant surfacing layer is abutted against the second corrosion-resistant surfacing layer.
Optionally, the preparation method of the coupling prefabricated member with the groove formed on the inner wall of the middle area in a ring mode comprises the following steps:
providing a tubular coupling blank, and forming a groove on the inner wall of the middle area of the tubular coupling blank in a boring processing mode to obtain a coupling prefabricated member with the groove on the inner wall of the middle area in a ring mode.
Optionally, the depth of the groove is 35% -45% of the wall thickness of the tubular coupling blank body.
Optionally, an included angle between the side wall of the groove and the bottom wall of the groove is 133-135 degrees.
Optionally, the sum of the thicknesses of the first corrosion-resistant transition material layer and the first corrosion-resistant welding material layer is 9-13 mm.
Optionally, the thickness of the first corrosion-resistant transition material layer is 0.8-1.5 mm, and the thickness of the first corrosion-resistant welding material layer is 8.2-11.5 mm.
Optionally, the sum of the thicknesses of the second corrosion-resistant transition material layer and the second corrosion-resistant welding material layer is equal to the depth of the groove plus 0.8-1.2 mm.
Optionally, the thickness of the second corrosion-resistant transition material layer is 0.8-1.5 mm.
The beneficial effects are that: according to the invention, when the bimetal composite pipe is connected with the coupling through threads, the first corrosion-resistant surfacing layer is abutted against the second corrosion-resistant surfacing layer, that is, the joint connection part of the bimetal composite pipe and the coupling is made of the same metal material, so that the galvanic corrosion phenomenon can be avoided, and the corrosion resistance is strong. The problems that the corrosion resistance of the joint connection part of the conventional bimetal composite pipe and the coupling is poor and unstable and serious risk hidden trouble is faced are effectively solved. Meanwhile, the arrangement of the first corrosion-resistant transition layer and the second corrosion-resistant transition layer and the combination of the corresponding welding process can reduce cracks and stress concentration generated during dissimilar metal welding, strength and toughness of a welding joint are improved, quality of the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer is improved, and corrosion resistance of the joint connection of the bimetal composite pipe and the coupling is further improved. Further, when the stainless steel welding wire contacts carbon steel in the bimetal composite pipe (or coupling) during welding preparation of the first corrosion-resistant transition layer (or the second corrosion-resistant transition layer), a small part of alloy elements enter into a fusion part of the carbon steel when the first corrosion-resistant transition layer (or the second corrosion-resistant transition layer) is formed after the stainless steel welding wire is melted, so that the alloy element content of the first corrosion-resistant transition layer (or the second corrosion-resistant transition layer) is reduced, and in order to avoid that the alloy element content difference of the final first corrosion-resistant transition layer (or the second corrosion-resistant transition layer) and the first corrosion-resistant surfacing layer (or the second corrosion-resistant surfacing layer) is too large, the total alloy element content of the stainless steel welding wire adopted for welding preparation of the first corrosion-resistant transition layer and the second corrosion-resistant transition layer is higher than or equal to the total alloy element content of the stainless steel welding wire adopted for welding preparation of the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer. In addition, the welding process parameters have very important influence on the quality of the first corrosion-resistant transition layer and the second corrosion-resistant transition layer, the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer, so that the corrosion resistance of the final corrosion-resistant component is seriously influenced, and the welding process parameters are required to be reasonably set. Therefore, the invention adopts the direct current electrode negative electrode (DCEN), namely direct current reverse connection, and can play the role of removing the oxide film; the swinging frequency is 30-40 times/min, so that the thermal deformation and internal stress can be effectively reduced, and the welding quality is improved; the welding bead pressing amount directly affects the formation of a build-up layer and the performance of a welding seam, slag inclusion or grooves are easily generated at welding bead overlapping positions, the welding bead pressing amount is too large, the welding bead pressing is uneven or undercut is generated, in addition, the welding ratio and the dilution rate are affected by the pressing amount, the welding bead pressing amount has a better effect when 48-52%, the formation of the build-up welding seam is facilitated, and the quality of the build-up layer is guaranteed. The first corrosion-resistant transition layer and the second corrosion-resistant transition layer adopt the smaller welding current and welding voltage, so that smaller welding heat input can be obtained, the first corrosion-resistant transition layer and the second corrosion-resistant transition layer can be effectively ensured to reach thinner thickness, simultaneously, welding deformation and welding stress can be effectively reduced, and the quality of the first corrosion-resistant transition layer and the second corrosion-resistant transition layer is improved; the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer are selected and used, and the larger welding current and the welding voltage can ensure the quality of the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer and reach the preset thickness, and meanwhile reach the maximum cladding efficiency, so that the welding speed can be improved, the welding efficiency can be improved, and the time can be saved.
Drawings
FIG. 1 is a schematic diagram of a single-sided structure of a cross section of a corrosion resistant component in an embodiment of the invention.
FIG. 2a is a schematic illustration of a bimetallic composite tube blank in accordance with an embodiment of the present invention; FIG. 2b is a schematic illustration of welding a first corrosion resistant transition material layer and a first corrosion resistant brazing material layer to end surfaces of two ends of a bi-metallic composite pipe blank in accordance with an embodiment of the present invention.
Fig. 3a is a schematic structural view of a tubular coupling blank according to an embodiment of the present invention, fig. 3b is a schematic structural view of a coupling preform according to an embodiment of the present invention, and fig. 3c is a schematic structural view of another coupling preform according to an embodiment of the present invention.
FIG. 4 is a schematic illustration of welding a second corrosion resistant transition material layer and a second corrosion resistant braze material layer in a groove of a coupling preform in accordance with an embodiment of the present invention.
The reference numerals in the drawings indicate:
1. a bimetal composite pipe; 11. a bimetal composite pipe body; 111. a bimetallic composite tube blank; 12. a first corrosion-resistant weld overlay; 121. a first corrosion resistant layer of a brazing material; 13. a first corrosion-resistant transition layer; 131. a first layer of corrosion resistant transition material; 2. coupling; 21. a coupling body; 211. a tubular coupling blank; 212. a coupling preform; 22. a second corrosion-resistant weld overlay; 221. a second corrosion resistant layer of a brazing material; 23. a second corrosion-resistant transition layer; 231. a second corrosion resistant transition material layer; 3. and (5) screw threads.
Detailed Description
The invention provides a corrosion-resistant component and a preparation method thereof, and the invention is further described in detail below in order to make the purposes, technical schemes and effects of the invention clearer and more definite. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms such as "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
When an element is referred to as being "fixed" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
If there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
In addition, it should be noted that, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the embodiments, and when the technical solutions are inconsistent or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the scope of protection required by the present invention.
When the bimetal composite pipe is used, if a pure corrosion-resistant material coupling is selected, the carbon steel layer at the end of the bimetal composite pipe is directly contacted with the corrosion-resistant material of the coupling, so that galvanic corrosion phenomenon is generated between dissimilar metals, namely a corrosion battery is formed between the metal with higher potential and the metal with lower potential, and as a result, the metal with higher potential generates cathode reaction, so that the corrosion process is inhibited; the metal with lower potential reacts with anode, which results in acceleration of the corrosion process. Therefore, the corrosion resistance of the joint connection of the existing bimetal composite pipe and the coupling is poor and unstable, and the major risk hidden trouble is faced. Based on this, an embodiment of the present invention provides a corrosion resistant assembly, wherein, as shown in fig. 1, the corrosion resistant assembly includes a bimetal composite pipe 1 and a collar 2 capable of being connected with the bimetal composite pipe 1 by a thread 3;
The bimetal composite pipe 1 includes:
a bimetal composite pipe body 11;
a first corrosion-resistant transition layer 13 disposed on end surfaces of both ends of the bimetal composite pipe body 11 (fig. 1 illustrates only a structure of one end of the bimetal composite pipe);
a first corrosion-resistant overlay layer 12 disposed on the first corrosion-resistant transition layer 13;
the coupling 2 comprises:
a collar body 21;
a second corrosion-resistant transition layer 23 which is annularly arranged on the inner wall of the middle area of the coupling body 21,
a second corrosion-resistant build-up layer 22 disposed on the second corrosion-resistant transition layer 23 (the coupling is axially symmetrical in a direction perpendicular to the axial direction, and fig. 1 only illustrates the coupling structure on one side of the symmetry axis);
when the bimetal composite pipe and the coupling are connected through threads, the first corrosion resistant surfacing layer 12 is abutted against the second corrosion resistant surfacing layer 22;
the first corrosion-resistant transition layer, the first corrosion-resistant surfacing layer, the second corrosion-resistant transition layer and the second corrosion-resistant surfacing layer are all prepared by adopting non-consumable electrode inert gas tungsten electrode welding (TIG welding);
the same stainless steel welding wire is adopted for preparing the first corrosion-resistant transition layer by welding and preparing the second corrosion-resistant transition layer by welding; the same stainless steel welding wire is adopted for preparing the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer by welding;
The total content of alloy elements of the stainless steel welding wires adopted by the first corrosion-resistant transition layer and the second corrosion-resistant transition layer is higher than or equal to that of the stainless steel welding wires adopted by the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer;
the welding process parameters of the first corrosion-resistant transition layer prepared by welding and the second corrosion-resistant transition layer prepared by welding are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 120-180A, and the welding voltage is 10-12V;
the welding process parameters of the first corrosion-resistant surfacing layer prepared by welding and the second corrosion-resistant surfacing layer prepared by welding are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 220-240A, and the welding voltage is 13-16V.
The embodiment of the invention is not limited to the specific shape and structure of the thread, and can be an American Petroleum Institute (API) standard thread or a special thread which is not an API standard.
In the embodiment of the invention, when the bimetal composite pipe is connected with the coupling through threads, the first corrosion-resistant surfacing layer is propped against the second corrosion-resistant surfacing layer, that is, the joint connection parts of the bimetal composite pipe and the coupling are all made of the same metal material, so that the galvanic corrosion phenomenon can be avoided, and the corrosion resistance is strong. The problems that the corrosion resistance of the joint connection part of the conventional bimetal composite pipe and the coupling is poor and unstable and serious risk hidden trouble is faced are effectively solved. Meanwhile, the problem of high cost when the pure corrosion-resistant material coupling is adopted can be solved. Simultaneously, the setting of first corrosion-resistant transition layer and second corrosion-resistant transition layer can reduce crackle and stress concentration that produces when dissimilar metal welds, promotes the intensity and the toughness of welded joint department, promotes the quality of first corrosion-resistant overlay and second corrosion-resistant overlay, further promotes the corrosion resistance of the joint junction of bimetal composite pipe and coupling. When the first corrosion-resistant transition layer (or the second corrosion-resistant transition layer) is prepared by welding, as the stainless steel welding wire is in contact with carbon steel in the bimetal composite pipe (or the coupling), after the stainless steel welding wire is melted, the first corrosion-resistant transition layer (or the second corrosion-resistant transition layer) is formed, and a small part of alloy elements enter into a fusion part of the carbon steel, so that the alloy element content of the first corrosion-resistant transition layer (or the second corrosion-resistant transition layer) is reduced, and the final performance is influenced because the difference of the alloy element contents of the final first corrosion-resistant transition layer (or the second corrosion-resistant transition layer) and the first corrosion-resistant surfacing layer (or the second corrosion-resistant surfacing layer) is excessive. In addition, the welding process parameters have very important influence on the quality of the first corrosion-resistant transition layer and the second corrosion-resistant transition layer, the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer, so that the corrosion resistance of the final corrosion-resistant component is seriously influenced, and the welding process parameters are required to be reasonably set. Therefore, the invention adopts DCEN, namely direct current reverse connection, and can play the role of removing the oxide film; the swinging frequency is 30-40 times/min, so that the thermal deformation and internal stress can be effectively reduced, and the welding quality is improved; the welding bead pressing amount directly affects the formation of a build-up layer and the performance of a welding seam, slag inclusion or grooves are easily generated at welding bead overlapping positions, the welding bead pressing amount is too large, the welding bead pressing is uneven or undercut is generated, in addition, the welding ratio and the dilution rate are affected by the pressing amount, the welding bead pressing amount has a better effect when 48-52%, the formation of the build-up welding seam is facilitated, and the quality of the build-up layer is guaranteed. The first corrosion-resistant transition layer and the second corrosion-resistant transition layer are selected from the smaller welding current and welding voltage in the embodiment of the invention, so that smaller welding heat input can be obtained, the first corrosion-resistant transition layer and the second corrosion-resistant transition layer can be effectively ensured to reach thinner thickness, simultaneously, welding deformation and welding stress can be effectively reduced, and the quality of the first corrosion-resistant transition layer and the second corrosion-resistant transition layer is improved; the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer are selected for use, and the above-mentioned great welding current and welding voltage in this embodiment can reach the biggest cladding efficiency when guaranteeing the quality of first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer and reaching preset thickness, can improve welded speed, promote welding efficiency, save time.
The embodiment of the invention adopts a welding metallurgical composite mode, and can greatly improve the corrosion resistance of the joint of the pipe end of the bimetal composite pipe and the coupling. Specifically, the embodiment of the invention also provides a preparation method of the corrosion-resistant component, wherein the corrosion-resistant component comprises a bimetal composite pipe and a coupling which can be connected with the bimetal composite pipe through threads, when the bimetal composite pipe is connected with the coupling through threads, the first corrosion-resistant surfacing layer is abutted against the second corrosion-resistant surfacing layer, the preparation method of the corrosion-resistant component specifically comprises the following steps S1 to S3, and the implementation modes of the steps are described in detail below.
Step S1, as shown in FIG. 2a and FIG. 2b, providing a bimetal composite pipe blank 111, adopting TIG welding, setting the interlayer temperature to be not more than 250 ℃, preheating at 120-200 ℃, and welding a first corrosion-resistant transition material layer 131 on the end surfaces of two ends of the bimetal composite pipe blank 111 (FIG. 2b only shows that the first corrosion-resistant transition material layer is welded on the end surface of one end of the bimetal composite pipe blank, and the other end is the same); then setting the interlayer temperature to be not more than 200 ℃, and welding a first corrosion-resistant welding material layer 121 on the first corrosion-resistant transition material layer 131 at room temperature; external threads (API standard threads or special threads) are processed on the surfaces of the two ends of the bimetal composite pipe blank to obtain the bimetal composite pipe, as shown in fig. 1, the bimetal composite pipe 1 comprises a bimetal composite pipe body 11, and a first corrosion-resistant transition layer 13 and a first corrosion-resistant surfacing layer 12 which are sequentially laminated on the end surfaces of the two ends of the bimetal composite pipe body 11.
In the step, after a first corrosion-resistant transition material layer and a first corrosion-resistant welding material layer are welded on end surfaces of two ends of a bimetal composite pipe blank in sequence respectively, external threads are machined on the bimetal composite pipe blank, after machining, the bimetal composite pipe blank is machined into a metal composite pipe body, the first corrosion-resistant transition material layer is machined into a first corrosion-resistant transition layer, and the first corrosion-resistant welding material layer is machined into a first corrosion-resistant welding layer.
In some embodiments, the sum of the thickness of the first corrosion-resistant transition material layer and the thickness of the first corrosion-resistant welding material layer is 9-13 mm, so that the pipe end allowance of the later-stage API thread or special thread structure processing can be met. Specifically, the thickness of the first corrosion-resistant transition material layer is 0.8-1.5 mm, and the thickness of the first corrosion-resistant welding material layer is 8.2-11.5 mm.
Because cracks and stress concentration occur in the welding layer and peeling occurs due to the difference of the heat conductivity and the linear expansion coefficient when dissimilar metal welding is performed, the embodiment of the invention firstly welds a first corrosion-resistant transition material layer with the thickness of 0.8-1.5 mm at the pipe end of the bimetal composite pipe, then welds the first corrosion-resistant welding material layer on the first corrosion-resistant transition material layer, the two materials are stainless steel, and the problems of cracks and stress concentration occurring when dissimilar metal welding is performed when the first corrosion-resistant welding material layer is welded can be avoided. The arrangement of the first corrosion-resistant material layer with the thickness of 0.8-1.5 mm can play a better transitional role, the problem that cracks and stress concentration are generated when the thicker first corrosion-resistant surfacing material layer is directly welded to the end of the bimetal composite pipe to be stripped is avoided, meanwhile, the thickness of the first corrosion-resistant transitional material layer is only 0.8-1.5 mm, the welding process is combined (the swinging frequency is 30-40 times/min, the thermal deformation and the internal stress can be effectively reduced, the welding current is 120-180A, the welding current is smaller, the welding deformation and the welding stress can be effectively reduced, and the welding quality is improved, the problem that cracks and stress concentration are generated when the bimetal composite pipe end is welded with the first corrosion-resistant transitional material layer is avoided, and in addition, the problem that cracks are generated on the first corrosion-resistant transitional material layer due to the difference of the thermal conductivity and the linear expansion coefficient can be avoided to the greatest extent by combining the thinner welding process. The second corrosion-resistant transition material layer is arranged in the same way. In addition, the outer layer of the bimetal composite pipe is carbon steel, and the inner layer is made of corrosion-resistant materials, so that when the first corrosion-resistant transition material layer is deposited, welding materials with the same or similar components as those of the inner layer corrosion-resistant materials are selected as much as possible for welding, and the strength and toughness of the welding joint of the first corrosion-resistant transition material layer and the composite metal pipe can be improved.
And S2, providing a coupling prefabricated member with grooves formed on the inner wall of the middle area in a ring mode.
Specifically, as shown in fig. 3a-3c, the method for preparing the coupling preform 212, in which the groove is formed on the inner wall of the middle region in a ring, includes the steps of:
providing a tubular coupling blank 211, and forming a groove on the inner wall of the middle area of the tubular coupling blank 211 by boring to obtain a coupling prefabricated member 212 with the groove on the inner wall of the middle area.
Two structures are arranged on two sides of the inner groove of the coupling prefabricated member 212: as shown in fig. 3b, when the specification code of the coupling is smaller than 4-1/2 (i.e. the outer diameter specification is smaller than 114.30 mm), gradients smaller than 1:16 taper are required to be processed at the two ends of the inner wall of the tubular coupling blank, so that the accessibility of welding is facilitated, and meanwhile, the small gradient can be ensured not to influence the thread processing in the subsequent thread processing; as shown in FIG. 3c, when the specification code number of the coupling is larger than 4-1/2 size (namely, the outer diameter specification is larger than 114.30 mm), the inner wall of the tubular coupling blank body is directly grooved in the middle area without processing gradients with a certain taper at the two ends of the inner wall of the tubular coupling blank body.
In some embodiments, as shown in fig. 3b and 3c, the depth h2 of the groove is 35% -45% of the wall thickness h1 of the tubular collar blank, for example, may be 35%, 38%, 40%, 42% or 45%. In some specific embodiments, the included angle α between the side wall of the groove and the bottom wall of the groove is 133-135 degrees, for example, 133 degrees, 134 degrees, 135 degrees, or the like.
The depth of the groove is 35% -45% of the wall thickness h1 of the tubular coupling blank body, so that the contact between the bimetal composite pipe and the coupling joint can be fully ensured to be the same metal; the groove both sides are 133~135 degrees oblique angles, the welding of the groove root position of being convenient for, can avoid appearing the incomplete bonding or the cold joint scheduling problem when root welding.
In some embodiments, as shown in fig. 3b and 3c, the length L of the bottom wall of the groove is 49.5-50.8 mm, for example, may be 49.5mm, 49.8mm, 50mm, 50.2mm, 50.5mm, or 50.8 mm. The second corrosion-resistant surfacing layer in the coupling can be fully contacted with the first corrosion-resistant surfacing layer at the end of the bimetal composite pipe when the size can meet the requirements of subsequent API standard threads or special threads.
Step S3, as shown in FIG. 4, after preheating at the temperature of 120-200 ℃ and setting the interlayer temperature to be not more than 250 ℃ by adopting TIG welding, welding a second corrosion-resistant transition material layer 231 in the groove, and then welding a second corrosion-resistant welding material layer 221 on the second corrosion-resistant transition material layer 231 by setting the interlayer temperature to be not more than 200 ℃; internal threads (API marked threads or non-special threads) are machined on both sides of the second corrosion resistant brazing material layer 221 to form a coupling, and as shown in fig. 1, the coupling 2 includes a coupling body 21, and a second corrosion resistant transition layer 23 and a second corrosion resistant brazing layer 22 stacked on an inner wall of a middle region of the coupling body 21. As an example, the preheating is performed at a temperature of 120 ℃, 130 ℃, 140 ℃, 150 ℃ or 200 ℃.
In the step, after the second corrosion-resistant transition material layer and the second corrosion-resistant welding material layer are welded on the groove of the coupling prefabricated member in sequence, internal threads are machined on the groove, the coupling prefabricated member is machined into a coupling body after machining, the second corrosion-resistant transition material layer is machined into a second corrosion-resistant transition layer, and the second corrosion-resistant welding material layer is machined into a second corrosion-resistant welding layer.
In some embodiments, the sum of the thicknesses of the second corrosion-resistant transition material layer and the second corrosion-resistant welding material layer is equal to the groove depth plus 0.8-1.2 mm, that is, the total thickness of the welding layer=groove depth+ (0.8-1.2) mm, and the groove depth is set so that the size of the original tubular coupling blank body can be ensured after welding; the setting of the 0.8-1.2 mm part is the allowance of processing and polishing after overlaying, and the processing and polishing after overlaying ensures the flatness state of the inner surface of the coupling prefabricated member containing the welding layer. Specifically, the thickness of the second corrosion-resistant transition material layer is 0.8-1.5 mm, and the thickness of the second corrosion-resistant welding material layer=the total thickness of the welding layers- (0.8-1.5) mm.
The welding process parameters in the steps S21 and S23 are described in detail below, where the welding process parameters for welding the first corrosion-resistant transition material layer and the welding process parameters for welding the second corrosion-resistant transition material layer are: the polarity of the direct current is a direct current electrode negative electrode (DCEN), the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 120-180A, and the welding voltage is 10-12V; the welding first corrosion-resistant transition material layer and the welding second corrosion-resistant transition material layer adopt the same stainless steel welding wire; the stainless steel welding wire is of a type including, but not limited to, ER304, ER308L, ER, ER309L, ER, ER316L, ER317L or THT-307, etc.;
The welding technological parameters of the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer are as follows:
the polarity of the direct current is DCEN, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 220-240A, and the welding voltage is 13-16V;
the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer are welded by adopting the same stainless steel welding wire; the stainless steel wire types include, but are not limited to ER304, ER308L, ER, ER309L, ER, ER316L, ER317L, or THT-307, etc. The welding process parameters have very important influence on the quality of the first corrosion-resistant transition material layer and the second corrosion-resistant transition material layer, the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer, so that the corrosion resistance of the final corrosion-resistant component is seriously influenced, and the welding process parameters need to be reasonably set. Therefore, in this embodiment, DCEN, i.e., direct current reverse connection, is used to remove the oxide film, which may also be referred to as "cathode break-up" or "cathode atomization"; the swinging frequency is 30-40 times/min, so that the thermal deformation and internal stress can be effectively reduced, and the welding quality is improved; the welding bead pressing amount directly affects the formation of a build-up layer and the performance of a welding seam, slag inclusion or grooves are easily generated at welding bead overlapping positions, the welding bead pressing amount is too large, the welding bead pressing is uneven or undercut is generated, in addition, the welding ratio and the dilution rate are affected by the pressing amount, the welding bead pressing amount has a better effect when 48-52%, the formation of the build-up welding seam is facilitated, and the quality of the build-up layer is guaranteed. The first corrosion-resistant transition material layer and the second corrosion-resistant transition material layer are selected from the smaller welding current and welding voltage, so that smaller welding heat input can be obtained, the first corrosion-resistant transition material layer and the second corrosion-resistant transition material layer can be effectively ensured to reach the thinner thickness, meanwhile, welding deformation and welding stress can be effectively reduced, the quality of the first corrosion-resistant transition layer and the second corrosion-resistant transition layer is improved, and defects are avoided; the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer are selected from the large welding current and the welding voltage, so that the quality of the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer can be ensured, the preset thickness is achieved, the maximum cladding efficiency is achieved, the welding speed can be improved, the welding efficiency is improved, and the time is saved. The inventor finds that when the welding current for welding the first corrosion-resistant transition material layer and the second corrosion-resistant transition material layer exceeds the range of 120-180A and the welding voltage exceeds the range of 10-12V, the first corrosion-resistant transition material layer with good quality and thickness of only 0.8-1.5 mm cannot be formed, and the phenomena of welding deformation and welding stress can be generated. And when welding the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer, the welding current exceeds 220-240A, and when the welding voltage exceeds 13-16V, the welding quality cannot be ensured and the welding efficiency cannot be improved.
The total content of alloy elements in the stainless steel welding wire used for welding the first corrosion-resistant transition material layer is higher than or equal to that in the stainless steel welding wire used for welding the first corrosion-resistant welding material layer; and the total content of alloy elements in the stainless steel welding wire used for welding the second corrosion-resistant transition material layer is higher than or equal to that in the stainless steel welding wire used for welding the second corrosion-resistant welding material layer. When the total content of the alloy elements in the stainless steel welding wires used for welding the first corrosion-resistant transition material layer is equal to that in the stainless steel welding wires used for welding the first corrosion-resistant welding material layer, although a small part of the alloy elements in the first corrosion-resistant transition material layer can enter a carbon steel fusion area to reduce the alloy element content, the thickness of the first corrosion-resistant transition material layer is thinner and is only 0.8-1.5 mm, so that the influence of the reduction of the alloy element content on the final effect is little. And when the total content of alloy elements in the stainless steel welding wire used for welding the first corrosion-resistant transition material layer is higher than that in the stainless steel welding wire used for welding the first corrosion-resistant welding material layer, the first corrosion-resistant transition material layer has good plasticity and is not easy to generate defects. For example, the ER317L stainless steel welding wire is adopted for welding the first corrosion-resistant transition material layer, so that the first corrosion-resistant transition material layer has good plasticity and is used as a good transition layer, and the problems of cracks and stress concentration generated when the first corrosion-resistant welding material layer is directly welded are prevented; the welding of the first corrosion-resistant welding material layer adopts ER316L stainless steel welding wires; and the welding of the second corrosion-resistant transition material layer adopts ER317L stainless steel welding wires, and the same is done with the first corrosion-resistant transition material layer, and the welding of the second corrosion-resistant welding material layer adopts ER316L stainless steel welding wires.
The following is a detailed description of specific examples.
Example 1
Providing a bimetal composite pipe blank with the specification of 73.02 multiplied by 5.51mm (namely, the outer diameter is 73.02mm and the wall thickness is 5.51 mm), wherein the outer metal is N80Q steel grade, the inner layer is 316L stainless steel, the thickness is 1mm, and the chemical compositions are shown in the table 1;
a tubular collar blank was provided having a gauge of 88.9x14mm (i.e., an outer diameter of 88.9mm and a wall thickness of 14 mm), a metal of N80Q grade steel, and the chemical composition shown in table 1.
TABLE 1 specification and chemical composition of bimetallic composite pipe blank and tubular coupling blank
The preparation method of the corrosion-resistant component comprises the following steps:
adopting a TIG welding machine, setting the interlayer temperature at 230 ℃, the preheating temperature of the bimetal composite pipe blank body before welding at 200 ℃, and adopting welding wires of 1.6mm ER317L to carry out overlaying welding on the end surfaces of the two ends of the bimetal composite pipe blank body to form a first corrosion-resistant transition material layer with the thickness of 1.0 mm; a TIG welding machine and a 2.5mm ER316L welding wire are adopted, the interlayer temperature is set to be 180 ℃, the surfacing is carried out on the first corrosion-resistant transition material layer, a first corrosion-resistant surfacing material layer with the thickness of 9.0mm is formed, and argon is continuously introduced for 5 minutes after welding; then external threads (the shape of the threads can be seen in Chinese patent No. 212454292U) are processed on the surfaces of the two ends of the bimetal composite pipe blank body, so that a bimetal composite pipe is obtained;
Forming a groove on the inner wall of the middle area of the tubular coupling blank body in a boring processing mode to obtain a coupling prefabricated member with the groove formed on the inner wall of the middle area in a ring mode, as shown in fig. 3b, wherein the length L of the bottom wall of the groove is 50mm, the depth h2 of the groove is 5.6mm, the included angle alpha between the side wall of the groove and the bottom wall of the groove is 135 degrees, and the taper of two sides of the groove is 1:32;
adopting a TIG (tungsten inert gas) welding machine, setting the interlayer temperature at 230 ℃, preheating the coupling prefabricated member at 200 ℃ before welding, and adopting a welding wire with the thickness of 1.6mm ER317L to build up welding on the groove to form a second corrosion-resistant transition material layer with the thickness of 1.0 mm; a TIG welding machine and a 2.5mm ER316L welding wire are adopted, the interlayer temperature is set to be 180 ℃, and build-up welding is carried out on the second corrosion-resistant transition material layer to form a second corrosion-resistant build-up welding material layer with the thickness of 5.6mm, and argon is continuously introduced for 5 minutes after welding; and then machining internal threads (the shape of the threads can be seen in Chinese patent No. 212454292U) on two sides of the second corrosion-resistant welding material layer, and polishing to obtain the coupling.
The specific process parameters for TIG weld overlay are shown in table 2 below.
TABLE 2 technological parameters of TIG overlay
The oil and gas well pipe column formed by the corrosion-resistant component provided by the embodiment has good corrosion resistance and long service life.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (9)
1. A corrosion resistant assembly comprising a bimetallic composite tube and a collar threadably connectable to the bimetallic composite tube;
the bimetal composite pipe comprises:
a bimetal composite pipe body;
the first corrosion-resistant transition layers are arranged on the end surfaces of the two ends of the bimetal composite pipe body;
the first corrosion-resistant surfacing layer is arranged on the first corrosion-resistant transition layer;
the coupling comprises:
a coupling body;
the second corrosion-resistant transition layer is annularly arranged on the inner wall of the middle area of the coupling body;
the second corrosion-resistant surfacing layer is arranged on the second corrosion-resistant transition layer;
when the bimetal composite pipe is connected with the coupling through threads, the first corrosion-resistant surfacing layer is propped against the second corrosion-resistant surfacing layer;
the first corrosion-resistant transition layer, the first corrosion-resistant surfacing layer, the second corrosion-resistant transition layer and the second corrosion-resistant surfacing layer are all prepared by adopting non-melt inert gas tungsten electrode shielded welding;
The same stainless steel welding wire is adopted for preparing the first corrosion-resistant transition layer by welding and preparing the second corrosion-resistant transition layer by welding; the same stainless steel welding wire is adopted for preparing the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer by welding;
the total content of alloy elements of the stainless steel welding wires adopted by the first corrosion-resistant transition layer and the second corrosion-resistant transition layer is higher than or equal to that of the stainless steel welding wires adopted by the first corrosion-resistant surfacing layer and the second corrosion-resistant surfacing layer;
the welding process parameters of the first corrosion-resistant transition layer prepared by welding and the second corrosion-resistant transition layer prepared by welding are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 120-180A, and the welding voltage is 10-12V;
the welding process parameters of the first corrosion-resistant surfacing layer prepared by welding and the second corrosion-resistant surfacing layer prepared by welding are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 220-240A, and the welding voltage is 13-16V.
2. The preparation method of the corrosion-resistant component is characterized by comprising a bimetal composite pipe and a coupling which can be connected with the bimetal composite pipe through threads, and comprises the following steps:
Providing a bimetal composite pipe blank, adopting non-melt electrode inert gas tungsten electrode protection welding, setting the interlayer temperature to be not more than 250 ℃, preheating at 120-200 ℃, and welding a first corrosion-resistant transition material layer on the end surfaces of two ends of the bimetal composite pipe blank; then setting the interlayer temperature to be not more than 200 ℃, and welding a first corrosion-resistant welding material layer on the first corrosion-resistant transition material layer at room temperature; external threads are machined on the surfaces of two ends of the bimetal composite pipe blank to obtain the bimetal composite pipe, wherein the bimetal composite pipe comprises a bimetal composite pipe body, and a first corrosion-resistant transition layer and a first corrosion-resistant surfacing layer which are sequentially laminated on the end surfaces of two ends of the bimetal composite pipe body;
providing a coupling prefabricated member with a groove formed on the inner wall of the middle area in a ring manner;
adopting non-consumable electrode inert gas tungsten electrode protection welding, setting the interlayer temperature to be not more than 250 ℃, preheating at 120-200 ℃, welding a second corrosion-resistant transition material layer in the groove, setting the interlayer temperature to be not more than 200 ℃, and welding a second corrosion-resistant welding material layer on the second corrosion-resistant transition material layer; processing internal threads on two sides of the second corrosion-resistant welding material layer to obtain the coupling, wherein the coupling comprises a coupling body, and a second corrosion-resistant transition layer and a second corrosion-resistant welding overlay which are stacked on the inner wall of the middle area of the coupling body;
The welding first corrosion-resistant transition material layer and the welding second corrosion-resistant transition material layer adopt the same stainless steel welding wire;
the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer are welded by adopting the same stainless steel welding wire;
the total content of alloy elements of the stainless steel welding wires used for welding the first corrosion-resistant transition material layer and the second corrosion-resistant transition material layer is higher than or equal to that of the stainless steel welding wires used for welding the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer;
the welding technological parameters of the first corrosion-resistant transition material layer and the second corrosion-resistant transition material layer are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 120-180A, and the welding voltage is 10-12V;
the welding technological parameters of the first corrosion-resistant welding material layer and the second corrosion-resistant welding material layer are as follows:
the polarity of the direct current is the negative electrode of the direct current electrode, the swing frequency is 30-40 times/min, the channel pressing amount is 48-52%, the welding current is 220-240A, and the welding voltage is 13-16V;
When the bimetal composite pipe is connected with the coupling through threads, the first corrosion-resistant surfacing layer is abutted against the second corrosion-resistant surfacing layer.
3. The method of manufacturing a coupling preform having grooves formed around the inner wall of the intermediate region according to claim 2, comprising the steps of:
providing a tubular coupling blank, and forming a groove on the inner wall of the middle area of the tubular coupling blank in a boring processing mode to obtain a coupling prefabricated member with the groove on the inner wall of the middle area in a ring mode.
4. The method of manufacturing according to claim 3, wherein the depth of the groove is 35% -45% of the wall thickness of the tubular collar blank.
5. The method of claim 3, wherein an included angle between a side wall of the groove and a bottom wall of the groove is 133-135 degrees.
6. The method of claim 2, wherein the sum of the thicknesses of the first corrosion-resistant transition material layer and the first corrosion-resistant brazing material layer is 9-13 mm.
7. The method of claim 6, wherein the first corrosion-resistant transition material layer has a thickness of 0.8-1.5 mm and the first corrosion-resistant brazing material layer has a thickness of 8.2-11.5 mm.
8. The method of claim 4 or 5, wherein the sum of the thicknesses of the second corrosion-resistant transition material layer and the second corrosion-resistant brazing material layer is equal to the groove depth plus 0.8-1.2 mm.
9. The method of claim 8, wherein the second corrosion resistant transition material layer has a thickness of 0.8 to 1.5mm.
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| CN110449692A (en) * | 2019-07-29 | 2019-11-15 | 南京工程学院 | A kind of Phase Proportion control method of carbon steel surface overlaying two-phase anti-corrosion layer |
| CN212317880U (en) * | 2020-05-19 | 2021-01-08 | 上海天阳钢管有限公司 | Double-metal coupling |
| CN112049580A (en) * | 2020-10-16 | 2020-12-08 | 西安德信成科技有限责任公司 | Connecting joint of bimetal composite oil pipe |
| CN214579434U (en) * | 2020-12-04 | 2021-11-02 | 中海油（天津）管道工程技术有限公司 | Pipe end connecting structure of bimetal metallurgy composite pipe |
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