CN114054903A - Magnetic pulse-TIG welding connection method of stainless composite pipe - Google Patents
Magnetic pulse-TIG welding connection method of stainless composite pipe Download PDFInfo
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- CN114054903A CN114054903A CN202111458887.5A CN202111458887A CN114054903A CN 114054903 A CN114054903 A CN 114054903A CN 202111458887 A CN202111458887 A CN 202111458887A CN 114054903 A CN114054903 A CN 114054903A
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- composite pipe
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- base layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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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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Abstract
The invention discloses a magnetic pulse-TIG welding connection method of a stainless composite pipe, which comprises the following processes: step one, treating a base layer and a coating layer of two composite pipes to be welded to enable the shapes of joints of the two composite pipes to be matched, and cleaning a processing part; sleeving a nickel sheet ring at the joint of a composite pipe; connecting the other composite pipe with the composite pipe sleeved with the nickel sheet ring, and enabling the nickel sheet ring to be attached to the base layer and the coating layer of the two composite pipes; step four, arranging the supporting device inside the region to be welded to support the region to be welded; sleeving an electromagnetic coil on the outer side of the area to be welded, and electrifying the electromagnetic coil to tightly connect the base layer and the coating layer of the two composite pipes with the nickel sheet ring; and sixthly, removing the electromagnetic coil and the supporting device, and welding the welding seams at the joints of the two composite pipes by adopting TIG welding. The invention can effectively eliminate the stress concentration of the connecting area and the cracking problem caused by the stress concentration.
Description
Technical Field
The invention relates to the technical field of stainless composite pipe welding, in particular to a magnetic pulse-TIG welding connection method of a stainless composite pipe.
Background
The stainless composite pipe is formed by combining a carbon steel base layer and a stainless steel coating layer, the base layer and the coating layer are combined in a mechanical combination or metallurgical combination mode, and the stainless steel coating layer of the inner layer has good corrosion resistance and can convey corrosive media in the using process; the outer carbon steel base layer has higher strength, and the problem that the coating is cracked due to overlarge internal pressure of the pipeline is solved. The stainless composite pipe fully exerts the corrosion resistance advantage of the coating and the strength advantage of the base layer, and has important application in the field of petrochemical industry.
At present, the connection problem of the stainless composite pipe is an important obstacle influencing the use effect and application and popularization of the stainless composite pipe, once the technological parameters are not properly selected or welding materials are not properly selected, a hardened martensite structure is easily generated at a connection part by a fusion welding connection method generally adopted at the present stage, and the residual stress of a connection area is extremely high and the distribution state is complex; the unfavorable structures and residual stress can not be eliminated through subsequent process measures, the risk of crack initiation is left, integral fracture failure is easy to generate, a large amount of work is performed around the design of joints, welding methods, welding materials, process parameters and other factors, the equipment and the method are lack of universality, and the popularization and application of the stainless composite pipe are greatly limited.
Therefore, it is desirable to design a magnetic pulse-TIG welding connection method for stainless composite pipes to solve the above problems.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following scheme: the invention provides a magnetic pulse-TIG welding connection method of a stainless composite pipe, which comprises the following steps:
step one, treating a base layer and a coating layer of two composite pipes to be welded to enable the shapes of joints of the two composite pipes to be matched, and cleaning a machined part;
sleeving a nickel sheet ring at the joint of the composite pipe;
connecting the other composite pipe with the composite pipe sleeved with the nickel sheet ring, and enabling the nickel sheet ring to be attached to the base layer and the coating layer of the two composite pipes;
fourthly, arranging a supporting device in the region to be welded to support the region to be welded;
sleeving an electromagnetic coil on the outer side of the area to be welded, and electrifying the electromagnetic coil to tightly connect the base layer and the coating layer of the two composite pipes with the nickel sheet ring;
and sixthly, removing the electromagnetic coil and the supporting device, and welding the welding seam at the position of the two composite pipe joints by adopting TIG welding.
Preferably, in the first step, the base layer and the cladding layer of the composite pipe are processed in the following manners: removing a part of the base layer of the composite pipe by adopting a mechanical processing mode to ensure that the length of the base layer of the composite pipe is less than that of the cladding; and removing a part of the cladding of the other composite pipe by adopting a mechanical processing mode, so that the cladding length of the composite pipe is less than the length of the base layer.
Preferably, the processing length L of the base layer and the cladding layer of the composite pipe in the first step is as follows:
4(H-h)＜L＜4H
and H is the wall thickness of the composite pipe, and H is the wall thickness of the base layer of the composite pipe.
Preferably, in the first step, the machining part is cleaned in a manner that: and removing the burrs of the machined part by adopting a mechanical method, and cleaning stains of the machined part by a chemical method after the burrs are removed.
Preferably, in the second step, the nickel sheet ring is sleeved on the exposed surface of the coating layer of the composite pipe, and the nickel sheet ring can cover the end surface of the coating layer of the composite pipe, the outer circular surface of the coating layer of the composite pipe and the end surface of the base layer of the composite pipe.
Preferably, the connection mode of the two composite pipes in the third step is as follows: and sleeving the composite pipe with the partial coating removed on the composite pipe with the partial base layer removed, wherein the nickel sheet ring is positioned between the two composite pipes.
Preferably, the supporting device in the fourth step comprises a supporting node, a plurality of hydraulic rods are fixedly connected to the outer side of the supporting node at equal intervals in the circumferential direction, the plurality of hydraulic rods are communicated with the supporting node, supporting blocks are fixedly connected to the tail ends of the plurality of hydraulic rods and used for contacting with the area to be welded, and the supporting node is communicated with a hydraulic oil pipe.
Preferably, in the sixth step, a pure nickel wire is added when the external weld is welded by using the TIG welding.
The invention discloses the following technical effects:
1. according to the invention, the nickel sheet ring is added between the two composite pipes for transition, so that the generation of martensite in an interface region can be effectively avoided during welding, and the problem of unstable quality of a fusion welding connection method is solved, thereby improving the performance of a welding joint and prolonging the service life of the pipe.
2. According to the invention, TIG welding is adopted to perform inner and outer weld joint coating, so that a complete welding joint is formed, and the stress concentration of a connecting area and the cracking problem caused by the stress concentration are effectively eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of magnetic pulse-TIG welding of a stainless composite tube according to the present invention;
FIG. 2 is a schematic view of the pre-weld preparation of the present invention;
FIG. 3 is a schematic view of a TIG weld repair port in the present invention;
FIG. 4 is a schematic view of the support device of the present invention;
wherein, 1, a base layer; 2. coating; 3. a nickel sheet ring; 4. an electromagnetic coil; 5. a support block; 6. a support node; 7. a hydraulic lever; 8. and a hydraulic oil pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 to 4, the invention discloses a magnetic pulse-TIG welding connection method of a stainless composite pipe, comprising the following processes:
step one, treating a base layer 1 and a coating layer 2 of two composite pipes to be welded to enable the shapes of joints of the two composite pipes to be matched, and cleaning a processing part;
secondly, sleeving a nickel sheet ring 3 at the joint of a composite pipe;
the nickel sheet ring 3 is added between the interfaces of the two composite pipes for transition, so that the generation of martensite in the interface area can be effectively avoided during welding, and the problem of unstable quality of a fusion welding connection method is solved, thereby improving the performance of a welding joint and prolonging the service life of the pipe.
Connecting the other composite pipe with the composite pipe sleeved with the nickel sheet ring 3, and enabling the nickel sheet ring 3 to be attached to the base layer 1 and the coating layer 2 of the two composite pipes;
the joint of the two composite pipes is jointed, so that the nickel sheet ring 3 can be jointed with the base layer 1 and the coating layer 2, and good guarantee can be provided for subsequent welding.
Step four, arranging the supporting device inside the region to be welded to support the region to be welded;
support welding region inside through strutting arrangement, can make the junction laminating of two compound pipes more firm, make nickel piece ring 3 simultaneously can with cladding 2 and 1 zonulae occludens of basic unit, make two compound pipes realize preliminary connection and provide the guarantee for the electromagnetic force that follow-up solenoid 4 produced.
Sleeving an electromagnetic coil 4 on the outer side of the area to be welded, and electrifying the electromagnetic coil 4 to tightly connect the base layer 1 and the coating layer 2 of the two composite pipes with the nickel sheet ring 3;
the electromagnetic coil 4 is arranged on the outer side of the area to be welded, the electromagnetic coil 4 is electrified, the electromagnetic coil 4 generates magnetic force, the base layer 1 of one composite pipe quickly collides with the coating layer 2 of the other composite pipe under the action of the electromagnetic force, and the coating layer 2, the nickel sheet and the base layer 1 are tightly connected together under the action of impact force, so that the primary connection of the two composite pipes is realized.
Removing the electromagnetic coil 4 and the supporting device, and welding the welding seams at the joints of the two composite pipes by adopting TIG welding; and the TIG welding is adopted to repair the opening of the welding seam, so that the welding of the two composite pipe joints is realized, meanwhile, the stress concentration of a connecting area and the cracking problem caused by the stress concentration can be effectively eliminated by adopting the TIG welding, and the quality of the composite pipe joints of the welding head is ensured.
Further, the treatment mode of the base layer 1 and the cladding layer 2 of the composite pipe in the step one is as follows: removing a part of the base layer 1 of the composite pipe by adopting a mechanical processing mode, so that the length of the base layer 1 of the composite pipe is less than that of the coating layer 2; a part of the cladding 2 of another composite pipe is removed by mechanical processing, so that the length of the cladding 2 of the composite pipe is less than that of the base layer 1.
Adopt this kind of form to process with compound pipe, can make the basic unit 1 and the cladding 2 of compound pipe have good adaptation degree, can insert the junction of another compound pipe through the mode of pegging graft earlier simultaneously with the junction of a compound pipe, make things convenient for two compound pipes to dock, the subsequent welding of being convenient for.
Further, the processing length L of the base layer 1 and the cladding layer 2 of the composite pipe in the step one is as follows:
4(H-h)＜L＜4H
wherein H is the wall thickness of the composite pipe, and H is the wall thickness of the base layer 1 of the composite pipe.
The processing length of the composite pipe is the length calculated by the formula, so that the polishing processing amount can be reduced on the premise of ensuring the connection strength, and the processing efficiency of the composite pipe is effectively improved.
Further, the cleaning mode of the processing part in the step one is as follows: removing burrs at the machined part by adopting a mechanical method, and cleaning stains at the machined part by a chemical method after the burrs are removed.
The burrs are removed by adopting a mechanical method, so that a composite pipe can be smoothly sleeved at the joint of another composite pipe, the problem of cracking caused by stress concentration of a welding part due to the existence of the burrs can be avoided, and the welding quality is guaranteed; dirt such as oil stain in the polishing process is removed through a chemical method, and the dirt can be prevented from influencing the welding quality.
Furthermore, in the second step, the nickel sheet ring 3 is sleeved on the surface of the exposed coating layer 2 of the composite pipe, the cross section of the nickel sheet ring 3 is bent, and the end surface of the coating layer 2 of the composite pipe, the outer circular surface of the coating layer 2 of the composite pipe and the end surface of the base layer 1 of the composite pipe can be covered.
The section of the nickel sheet ring 3 is bent, so that the end face of the cladding 2 of the composite pipe, the outer circular surface of the cladding 2 of the composite pipe and the end face of the base layer 1 of the composite pipe can be covered, namely the nickel sheet ring 3 is arranged between the cladding 2 and the base layer 1 of the two composite pipes, so that no extra filler wire is required in the process of welding the inner welding seam of the connection area of the composite pipes, and the welding difficulty is reduced; meanwhile, the two composite pipes are in transition through the nickel sheet ring 3, the generation of martensite in an interface area is effectively avoided, and the problem of unstable quality of a fusion welding connection method is solved, so that the performance of a welding joint is improved, and the service life of the pipe is prolonged.
Further, the connection mode of the two composite pipes in the third step is as follows: and sleeving the composite pipe with the part of the coating layer 2 removed on the composite pipe with the part of the base layer 1 removed, wherein the nickel sheet ring 3 is positioned between the two composite pipes.
The composite pipe with the part of the coating layer 2 removed is sleeved on the composite pipe with the part of the base layer 1 removed, the nickel sheet ring 3 is positioned between the two composite pipes, the nickel sheet ring 3 is used as transition, the generation of martensite in an interface area can be effectively avoided during welding, the problem of unstable quality of a fusion welding connection method is solved, the performance of a welding joint is improved, and the service life of the pipe is prolonged.
Furthermore, the supporting device in the fourth step comprises a supporting node 6, a plurality of hydraulic rods 7 are fixedly connected to the outer side of the supporting node 6 at equal intervals in the circumferential direction, the plurality of hydraulic rods 7 are communicated with the supporting node 6, supporting blocks 5 are fixedly connected to the tail ends of the plurality of hydraulic rods 7, the supporting blocks 5 are used for contacting with areas to be welded, and the supporting node 6 is communicated with a hydraulic oil pipe 8.
According to the invention, the hydraulic rod 7 is used as a supporting structure, the pressure of hydraulic oil is transmitted to the hydraulic rod 7 through the hydraulic oil pipe 8 and the supporting node 6, so that the extension and contraction of the hydraulic rod 7 are controlled, and the size of the turning radius of the supporting block 5 is adjusted, so that the supporting requirements of pipes with different inner diameters are met.
Further, in the sixth step, pure nickel wires are added when TIG welding is adopted to weld the external welding seam.
Performing opening patching on the end surfaces of the base layer 1 and the cladding layer 2 of the composite pipe by adopting TIG welding, wherein the cladding layer 2 of the composite pipe and the nickel sheet ring 3 have good compatibility and cannot generate unfavorable tissues, so that no wire filling can be performed in the process of welding the inner welding seam; and when the external welding seam is welded, a pure nickel wire needs to be added so as to ensure that the connecting area has good plasticity and toughness and improve the comprehensive performance of the connecting area.
The specific implementation mode is as follows: treating the base layer 1 and the coating layer 2 of the two composite pipes to be welded to enable the shapes of the joints of the two composite pipes to be matched, and cleaning the processed parts; a nickel sheet ring 3 is sleeved at the joint of the composite pipe; connecting the other composite pipe with the composite pipe sleeved with the nickel sheet ring 3; supporting the inside of the area to be welded; sleeving an electromagnetic coil 4, and electrifying the electromagnetic coil 4 to tightly connect the base layer 1 and the coating layer 2 of the two composite pipes with the nickel sheet ring 3; removing the electromagnetic coil 4 and the supporting device, and welding the welding seams at the joints of the two composite pipes by adopting TIG welding; and (5) completing welding. According to the invention, the nickel sheet ring 3 is added between the two composite pipes for transition, so that the generation of martensite in an interface region can be effectively avoided during welding, and the problem of unstable quality of a fusion welding connection method is solved, thereby improving the performance of a welding joint and prolonging the service life of the pipe; and the TIG welding is adopted to perform inner and outer weld joint coating, so that a complete welding joint is formed, and the stress concentration of a connecting area and the cracking problem caused by the stress concentration are effectively eliminated.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. A magnetic pulse-TIG welding connection method of a stainless composite pipe is characterized in that: the method comprises the following steps:
step one, treating a base layer (1) and a coating layer (2) of two composite pipes to be welded to enable the shapes of joints of the two composite pipes to be matched, and cleaning machined parts;
secondly, sleeving a nickel sheet ring (3) at the joint of the composite pipe;
connecting the other composite pipe with the composite pipe sleeved with the nickel sheet ring (3), and enabling the nickel sheet ring (3) to be attached to the base layer (1) and the coating layer (2) of the two composite pipes;
fourthly, arranging a supporting device in the region to be welded to support the region to be welded;
sleeving an electromagnetic coil (4) on the outer side of the area to be welded, and electrifying the electromagnetic coil (4) to tightly connect the base layer (1) and the coating layer (2) of the two composite pipes with the nickel sheet ring (3);
and sixthly, removing the electromagnetic coil (4) and the supporting device, and welding the welding seam at the position of the two composite pipe joints by adopting TIG welding.
2. A magnetic pulse-TIG welding connection method of a stainless composite pipe according to claim 1, characterized in that: in the first step, the base layer (1) and the cladding layer (2) of the composite pipe are treated in the following way: removing a part of the base layer (1) of the composite pipe in a mechanical processing mode, so that the length of the base layer (1) of the composite pipe is smaller than that of the cladding (2); and removing a part of the cladding (2) of the other composite pipe by adopting a mechanical processing mode, so that the length of the cladding (2) of the composite pipe is smaller than that of the base layer (1).
3. A magnetic pulse-TIG welding connection method of a stainless composite pipe according to claim 1, characterized in that: the processing length L of the base layer (1) and the cladding layer (2) of the composite pipe in the step one is as follows:
4(H-h)＜L＜4H
and H is the wall thickness of the composite pipe, and H is the wall thickness of the base layer (1) of the composite pipe.
4. A magnetic pulse-TIG welding connection method of a stainless composite pipe according to claim 1, characterized in that: the cleaning mode of the processing part in the first step is as follows: and removing the burrs of the machined part by adopting a mechanical method, and cleaning stains of the machined part by a chemical method after the burrs are removed.
5. A magnetic pulse-TIG welding connection method of a stainless composite pipe according to claim 1, characterized in that: in the second step, the nickel sheet ring (3) is sleeved on the surface of the exposed coating layer (2) of the composite pipe, and the nickel sheet ring (3) can cover the end surface of the coating layer (2) of the composite pipe, the outer circular surface of the coating layer (2) of the composite pipe and the end surface of the base layer (1) of the composite pipe.
6. A magnetic pulse-TIG welding connection method of a stainless composite pipe according to claim 2, characterized in that: in the third step, the connection mode of the two composite pipes is as follows: and sleeving the composite pipe with the part of the coating (2) removed on the composite pipe with the part of the base layer (1) removed, wherein the nickel sheet ring (3) is positioned between the two composite pipes.
7. A magnetic pulse-TIG welding connection method of a stainless composite pipe according to claim 1, characterized in that: in the fourth step, the supporting device comprises a supporting node (6), a plurality of hydraulic rods (7) are fixedly connected to the outer side of the supporting node (6) in the circumferential direction at equal intervals, the plurality of hydraulic rods (7) are communicated with the supporting node (6), a plurality of supporting blocks (5) are fixedly connected to the tail ends of the hydraulic rods (7), the supporting blocks (5) are used for being in contact with the area to be welded, and the supporting node (6) is communicated with a hydraulic oil pipe (8).
8. A magnetic pulse-TIG welding connection method of a stainless composite pipe according to claim 1, characterized in that: and sixthly, adding pure nickel wires when the TIG welding is adopted to weld the external welding seam.
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| CN202111458887.5A CN114054903B (en) | 2021-12-02 | 2021-12-02 | Magnetic pulse-TIG welding connection method of stainless composite pipe |
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| CN202111458887.5A CN114054903B (en) | 2021-12-02 | 2021-12-02 | Magnetic pulse-TIG welding connection method of stainless composite pipe |
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| CN113385804A (en) * | 2021-06-22 | 2021-09-14 | 南昌航空大学 | Transition liquid phase auxiliary electromagnetic pulse welding device and method |
| CN214838961U (en) * | 2021-01-12 | 2021-11-23 | 上海天阳钢管有限公司 | Bimetal composite pipe splicing structure |
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2021
- 2021-12-02 CN CN202111458887.5A patent/CN114054903B/en active Active
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| CN1669714A (en) * | 2005-05-16 | 2005-09-21 | 凌星中 | Stainless steel composite steel pipe welding method |
| CN101905375A (en) * | 2010-07-29 | 2010-12-08 | 哈尔滨工业大学 | Magnetic pulse connecting method and joint structure for thin-wall metal pipelines |
| CN106975819A (en) * | 2016-01-15 | 2017-07-25 | 宝鸡石油钢管有限责任公司 | A kind of Ni-based composite bimetal pipe all-position automatic soldering method |
| US20190151980A1 (en) * | 2016-05-10 | 2019-05-23 | Adm28 S.Àr.L | Method for joining very thick tubular parts by magnetic pulses and corresponding article |
| CN107695509A (en) * | 2017-10-21 | 2018-02-16 | 天津大学 | Titanium steel composite pipe welding method based on agitating friction weldering/melting welding Combined Welding |
| CN214838961U (en) * | 2021-01-12 | 2021-11-23 | 上海天阳钢管有限公司 | Bimetal composite pipe splicing structure |
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| CN114054903B (en) | 2023-03-14 |
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