CN113172310A - Welding process for inlet and outlet connecting pipe of low-temperature reactor pressure vessel and heat exchanger connecting pipe - Google Patents
Welding process for inlet and outlet connecting pipe of low-temperature reactor pressure vessel and heat exchanger connecting pipe Download PDFInfo
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- CN113172310A CN113172310A CN202110409926.6A CN202110409926A CN113172310A CN 113172310 A CN113172310 A CN 113172310A CN 202110409926 A CN202110409926 A CN 202110409926A CN 113172310 A CN113172310 A CN 113172310A
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- connecting pipe
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- heat exchanger
- pressure vessel
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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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
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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
-
- 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
- B23K2101/14—Heat exchangers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a welding process of an inlet/outlet connecting pipe of a low-temperature reactor pressure vessel and a heat exchanger connecting pipe, which relates to the technical field of connecting pipe welding and comprises the following steps: step one, processing an I-shaped groove on one side to be welded of an inlet and outlet connecting pipe of a low-temperature reactor pressure vessel and a heat exchanger connecting pipe; step two, mounting a gas protection clamping tool, checking whether the assembly gap and the misalignment amount of the I-shaped groove of the inlet and outlet connecting pipe and the heat exchanger connecting pipe of the low-temperature reactor pressure vessel meet the precision requirement through an endoscope, if not, adjusting an adjusting bolt on the gas protection clamping tool until the assembly precision is qualified, and providing protective argon outside the welding seam by the gas protection clamping tool; and thirdly, positioning a welding gun to the positions to be welded of the inlet and outlet connecting pipes of the pressure vessel of the low temperature reactor and the connecting pipe of the heat exchanger with the aid of an endoscope, and then automatically welding in a full-position butt TIG helium arc inner welding mode. The welding process is stable in welding process, high in welding quality and high in welding efficiency.
Description
Technical Field
The invention relates to the technical field of connection pipe welding, in particular to a welding process of an inlet/outlet connection pipe of a low-temperature reactor pressure vessel and a heat exchanger connection pipe.
Background
The inlet and outlet connecting pipes of a certain low-temperature reactor pressure vessel and the heat exchanger connecting pipe are installed on site by adopting full-position butt TIG helium arc inner welding, the outer diameter of the pipe is 57mm, the wall thickness is 4mm, and the depth of a welding line is 261 mm. During all-position welding, the molten pools at different positions are subjected to different comprehensive actions of electric arc force, gravity and surface tension, and the defects of incomplete penetration of root welding seams, penetration of welding, concave overhead welding, incomplete fusion of filling welding side walls and the like are easily caused by the deviation of staggered edges, gaps and machining precision of field assembly. Because the external space of the product structure is limited, the pipe cannot be welded outside, and a high-temperature-resistant molten pool observation system cannot be additionally arranged inside the pipe, only the inner hole can be welded in a blind mode. The pipeline butt welding adopts conventional U type or V type groove multilayer multiple pass welding, and arc light and molten bath can not be observed to the in-process, and it is dangerous that weld once more has just divided into more, can't adjust welding parameter in real time very big increase the technology degree of difficulty again, and moreover the welding seam is in the pipeline end that a plurality of straight tubes and return bend butt joint pipe are constituteed, and the groove group is all great to clearance and wrong limit, and wrong limit is difficult to weld thoroughly once the bottom is made up to the out-of-tolerance V type or U type groove.
Disclosure of Invention
In order to solve the technical problems, the invention provides a welding process for an inlet/outlet connecting pipe and a heat exchanger connecting pipe of a low-temperature reactor pressure vessel, which has the advantages of stable welding process, high welding quality and high welding efficiency.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a welding process of an inlet/outlet connecting pipe and a heat exchanger connecting pipe of a low-temperature reactor pressure vessel, which comprises the following steps:
step one, processing an I-shaped groove on one side to be welded of an inlet and outlet connecting pipe of a low-temperature reactor pressure vessel and a heat exchanger connecting pipe;
secondly, mounting a gas protection clamping tool outside to-be-welded positions of the inlet and outlet connecting pipe of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe, using an endoscope to enter the inlet and outlet connecting pipe of the low-temperature reactor pressure vessel and the interior of the heat exchanger connecting pipe after the mounting is finished, checking whether the assembly gap and the misalignment amount of the I-shaped grooves of the inlet and outlet connecting pipe of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe meet the precision requirement of less than 0.5mm, and if the assembly gap and the misalignment amount do not meet the precision requirement of less than 0.5mm, adjusting an adjusting bolt on the gas protection clamping tool until the assembly precision is qualified, wherein the gas protection clamping tool can provide argon gas outside a welding line;
and thirdly, extending a welding gun in welding equipment to the inlet and outlet connecting pipes of the low-temperature reactor pressure vessel and the inside of the heat exchanger connecting pipe, positioning the welding gun to the positions to be welded of the inlet and outlet connecting pipes of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe with the aid of the endoscope, and then automatically welding in a full-position butt TIG helium arc inner welding mode.
Preferably, in step three, the welding parameters are as follows: the peak current is 115A-130A, the base current is 58A-62A, the peak time is 120ms, the base time is 280ms, the welding speed is 75mm/min, the arc voltage tracked by the peak current is 13.4V-14.0V, and the wire feeding speed is 0.45 m/min-0.6 m/min.
Preferably, in the third step, the flow of the argon shielding gas outside the welding seam provided by the gas shielding clamping tool in the welding process is 5L/min.
Preferably, in step three, the weld is observed through the endoscope after welding, and repair welding is performed if the weld is found to be unfused.
Preferably, the parent materials of the inlet and outlet connecting pipe of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe are both 0Cr18Ni10Ti, and the outer diameters and the wall thicknesses of the inlet and outlet connecting pipe of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe are both 57mm and 4 mm.
Preferably, in the third step, the welding equipment further comprises a welding wire and a tungsten electrode, wherein the welding wire is an ER308L stainless steel welding wire with the diameter of 1.0mm, the argon for protecting outside the welding seam is high-purity argon, the diameter of the tungsten electrode is 2.4mm, and the dry elongation of the tungsten electrode is 6 mm-8 mm.
Preferably, in step three, the welding device is a TIG automatic welding device.
Compared with the prior art, the invention has the following technical effects:
according to the welding process of the inlet and outlet connecting pipes of the low-temperature reactor pressure vessel and the connecting pipe of the heat exchanger, automatic welding is performed in an all-position butt TIG helium arc inner welding mode, and the problem that an all-position circular seam with large seam depth cannot be welded by manual inner welding is solved. When the TIG helium arc inner welding mode is used, the gas protection clamping tool is used for providing argon outside a welding line, namely, the TIG argon and helium mixed gas welding process is adopted, so that the problems that the welding arc is not stable enough under the condition of high current and the welding permeability is easily influenced by the content of chemical elements of the pipe S, Si when the TIG pure helium welding process is adopted are solved. Meanwhile, I-shaped grooves are processed on the to-be-welded sides of the inlet and outlet connecting pipes of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe, and the TIG argon-helium mixed gas welding process is combined with the I-shaped grooves, so that the connecting pipe with the wall thickness of 4mm can be welded thoroughly at one time, the single-side welding and the double-side welding are realized, the welding seam is attractive in appearance, multilayer and multi-pass welding is not needed, and the welding difficulty is reduced; the I-shaped groove is adopted, so that the gap and the misalignment of the paired groups can be conveniently adjusted, the precision requirement of less than 0.5mm can be met, the butt joint of the two connecting pipes is accurate, and the processing quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed 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 creative efforts.
Fig. 1 is a working schematic diagram of a welding process of an inlet/outlet connecting pipe and a heat exchanger connecting pipe of a low-temperature reactor pressure vessel provided by the invention.
Description of reference numerals: 1. an inlet and outlet connecting pipe of the low-temperature reactor pressure vessel; 2. a heat exchanger connecting pipe; 3. welding seams; 4. and (4) welding the welding gun.
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.
The invention aims to provide a welding process for inlet and outlet connecting pipes of a low-temperature reactor pressure vessel and connecting pipes of a heat exchanger, which has the advantages of stable welding process, high welding quality and high welding efficiency.
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.
As shown in fig. 1, the present embodiment provides a welding process for an inlet/outlet connection pipe 1 and a heat exchanger connection pipe 2 of a pressure vessel of a cryogenic reactor, which includes the following steps:
step one, processing an I-shaped groove on one side to be welded of an inlet and outlet connecting pipe 1 of a low-temperature reactor pressure vessel and a heat exchanger connecting pipe 2, wherein the I-shaped groove is simple in structure, easy to machine and very easy to ensure machining precision;
step two, mounting a gas protection clamping tool outside to-be-welded positions of an inlet/outlet connecting pipe 1 of a low-temperature reactor pressure vessel and a heat exchanger connecting pipe 2, entering the inlet/outlet connecting pipe 1 of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe 2 by using an endoscope after the mounting is finished, checking whether the assembly gap and the misalignment amount of the I-shaped grooves of the inlet/outlet connecting pipe 1 of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe 2 meet the precision requirement of less than 0.5mm, if the assembly gap and the misalignment amount do not meet the precision requirement of less than 0.5mm, adjusting an adjusting bolt on the gas protection clamping tool until the assembly precision is qualified, and providing protective argon outside a welding line by the gas protection clamping tool;
and step three, extending a welding gun 4 in the welding equipment to the inside of the inlet and outlet connecting pipe 1 of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe 2, positioning the welding gun 4 to the positions to be welded of the inlet and outlet connecting pipe 1 of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe 2 with the aid of an endoscope, and then automatically welding in a full-position butt TIG helium arc inner welding mode. Specifically, the welding gun 4 rotates when working, and the rotation center line of the welding gun 4 and the axis of the inlet and outlet connecting pipe 1 of the pressure vessel of the low temperature reactor are arranged in a collinear way.
Specifically, in step three, the welding parameters are as follows: the peak current is 115A-130A, the base current is 58A-62A, the peak time is 120ms, the base time is 280ms, the welding speed is 75mm/min, the arc voltage tracked by the peak current is 13.4V-14.0V, and the wire feeding speed is 0.45 m/min-0.6 m/min. And carrying out subarea control on the peak current, the base current, the welding speed, the wire feeding speed and the arc voltage in the whole welding process.
Specifically, in the third step, the flow of the argon for protecting outside the welding seam provided by the gas protection clamping tool in the welding process is 5L/min.
Specifically, in the third step, the welded joint 3 is observed through an endoscope after welding, and repair welding can be performed if the welded joint 3 is found to be unfused, and corresponding remelting parameters can be used for repair welding.
In the embodiment, the parent materials of the inlet and outlet connecting pipe 1 of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe 2 are 0Cr18Ni10Ti, the outer diameters of the inlet and outlet connecting pipe 1 of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe 2 are 57mm, and the wall thicknesses of the inlet and outlet connecting pipe 1 of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe 2 are 4 mm.
Specifically, in the third step, the welding equipment further comprises a welding wire and a tungsten electrode, wherein the welding wire is an ER308L stainless steel welding wire with the diameter of 1.0mm, the argon for protecting outside the welding seam is high-purity argon, the diameter of the tungsten electrode is 2.4mm, and the dry elongation of the tungsten electrode is 6-8 mm.
Specifically, in step three, the welding device is a TIG automatic welding device.
In the embodiment, automatic welding is carried out by adopting a mode of all-position butt TIG helium arc inner welding, so that the problem that the all-position circular seam with larger depth of the welding seam cannot be welded by manual inner welding is solved. When the TIG helium arc inner welding mode is used, the gas protection clamping tool provides argon outside a welding line, namely, the TIG argon and helium mixed gas welding process is adopted, so that the problems that the welding arc is not stable enough under the condition of high current and the welding permeability is easily influenced by the content of chemical elements of the pipe S, Si when the TIG pure helium welding process is adopted are solved, and the welding process is stable.
Meanwhile, I-shaped grooves are processed on the to-be-welded sides of the inlet and outlet connecting pipe 1 of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe 2, and the TIG argon-helium mixed gas welding process is combined with the I-shaped grooves, so that the connecting pipe with the wall thickness of 4mm can be welded completely at one time, the single-side welding and double-side forming are realized, the weld joint forming is attractive, multilayer and multi-pass welding is not required, the welding difficulty is reduced, and the welding efficiency is improved; through adopting I type groove to make and be convenient for adjust clearance and unfitness of butt joint to the group, make it can reach the required precision that is less than 0.5mm, and then make two takeovers butt joints accurate, promote the quality of processing, it is thus obvious that the welding process in this embodiment has that welding process is stable, welding quality is high and welding efficiency is high characteristics.
After the inlet and outlet connecting pipes 1 and the heat exchanger connecting pipe 2 of the low-temperature reactor pressure vessel in the embodiment are welded, the X-ray inspection, the intercrystalline corrosion test, the tensile test and the bending test of the low-temperature reactor pressure vessel meet the relevant standards. The inspection result shows that under the background of limited equipment swing, limited groove assembly and fluctuating pipe chemical composition, TIG argon-helium mixed gas and an I-shaped groove are adopted for the pipe-pipe all-position inner welding butt joint with the wall thickness of 4mm, so that the practical welding process is realized, and the welding quality of the all-position butt blind welding of the small-caliber pipeline is improved by adopting the welding process.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A welding process for inlet and outlet connecting pipes of a low-temperature reactor pressure vessel and connecting pipes of a heat exchanger is characterized by comprising the following steps of:
step one, processing an I-shaped groove on one side to be welded of an inlet and outlet connecting pipe of a low-temperature reactor pressure vessel and a heat exchanger connecting pipe;
secondly, mounting a gas protection clamping tool outside to-be-welded positions of the inlet and outlet connecting pipe of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe, using an endoscope to enter the inlet and outlet connecting pipe of the low-temperature reactor pressure vessel and the interior of the heat exchanger connecting pipe after the mounting is finished, checking whether the assembly gap and the misalignment amount of the I-shaped grooves of the inlet and outlet connecting pipe of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe meet the precision requirement of less than 0.5mm, and if the assembly gap and the misalignment amount do not meet the precision requirement of less than 0.5mm, adjusting an adjusting bolt on the gas protection clamping tool until the assembly precision is qualified, wherein the gas protection clamping tool can provide argon gas outside a welding line;
and thirdly, extending a welding gun in welding equipment to the inlet and outlet connecting pipes of the low-temperature reactor pressure vessel and the inside of the heat exchanger connecting pipe, positioning the welding gun to the positions to be welded of the inlet and outlet connecting pipes of the low-temperature reactor pressure vessel and the heat exchanger connecting pipe with the aid of the endoscope, and then automatically welding in a full-position butt TIG helium arc inner welding mode.
2. The process for welding the inlet/outlet connecting pipe and the heat exchanger connecting pipe of the pressure vessel of the cryogenic reactor according to claim 1, wherein in the third step, the welding parameters are as follows: the peak current is 115A-130A, the base current is 58A-62A, the peak time is 120ms, the base time is 280ms, the welding speed is 75mm/min, the arc voltage tracked by the peak current is 13.4V-14.0V, and the wire feeding speed is 0.45 m/min-0.6 m/min.
3. The process for welding the inlet/outlet connecting pipe and the heat exchanger connecting pipe of the low-temperature reactor pressure vessel as claimed in claim 1, wherein in the third step, the flow of the protective argon outside the welding line provided by the gas-shielded clamping tool in the welding process is 5L/min.
4. The process for welding the inlet/outlet connecting pipe and the heat exchanger connecting pipe of the low-temperature reactor pressure vessel as claimed in claim 1, wherein in the third step, the welding seam is observed through the endoscope after welding, and repair welding is performed if the welding seam is not fused.
5. The welding process of the inlet and outlet connecting pipe and the heat exchanger connecting pipe of the low-temperature reactor pressure vessel as claimed in claim 1, wherein the base materials of the inlet and outlet connecting pipe and the heat exchanger connecting pipe of the low-temperature reactor pressure vessel are 0Cr18Ni10Ti, the outer diameters of the inlet and outlet connecting pipe and the heat exchanger connecting pipe of the low-temperature reactor pressure vessel are 57mm, and the wall thicknesses of the inlet and outlet connecting pipe and the heat exchanger connecting pipe of the low-temperature reactor pressure vessel are 4 mm.
6. The process for welding the inlet/outlet connecting pipe and the heat exchanger connecting pipe of the low-temperature reactor pressure vessel as claimed in claim 1, wherein in the third step, the welding equipment further comprises a welding wire and a tungsten electrode, the welding wire is an ER308L stainless steel welding wire with the diameter of 1.0mm, the argon for protecting outside the welding seam is high-purity argon, the diameter of the tungsten electrode is 2.4mm, and the dry elongation of the tungsten electrode is 6 mm-8 mm.
7. The process for welding the inlet/outlet connecting pipe and the heat exchanger connecting pipe of the pressure vessel of the cryogenic reactor according to claim 1, wherein in the third step, the welding equipment is a TIG automatic welding device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110409926.6A CN113172310A (en) | 2021-04-16 | 2021-04-16 | Welding process for inlet and outlet connecting pipe of low-temperature reactor pressure vessel and heat exchanger connecting pipe |
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| CN202110409926.6A CN113172310A (en) | 2021-04-16 | 2021-04-16 | Welding process for inlet and outlet connecting pipe of low-temperature reactor pressure vessel and heat exchanger connecting pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113770491A (en) * | 2021-10-11 | 2021-12-10 | 哈尔滨焊接研究院有限公司 | Repair welding method for TIG (tungsten inert gas) inner welding of all-position butt joint of pipelines |
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Cited By (1)
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| CN113770491A (en) * | 2021-10-11 | 2021-12-10 | 哈尔滨焊接研究院有限公司 | Repair welding method for TIG (tungsten inert gas) inner welding of all-position butt joint of pipelines |
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Application publication date: 20210727 |