CN110732753A - Welding process for manufacturing inner container of low-temperature liquid storage tanks - Google Patents
Welding process for manufacturing inner container of low-temperature liquid storage tanks Download PDFInfo
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- CN110732753A CN110732753A CN201911042523.1A CN201911042523A CN110732753A CN 110732753 A CN110732753 A CN 110732753A CN 201911042523 A CN201911042523 A CN 201911042523A CN 110732753 A CN110732753 A CN 110732753A
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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
-
- 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
- B23K9/235—Preliminary treatment
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a manufacturing and welding process of inner containers of low-temperature liquid storage tanks, which comprises the following process flows of completing warehousing inspection → completing rolling of a cylinder body 1 and a cylinder body 2 according to drawings and a manufacturing process → completing welding of longitudinal seams of the cylinder body 1 and the cylinder body 2 → comparing the cylinder body 1 and the cylinder body 2 → nondestructive testing → assembling and butting of the cylinder body 1 and the cylinder body 2, and welding → nondestructive testing → assembly of a lower end socket and the cylinder body 1 and 2 on double sides → nondestructive testing → meeting the requirements of deoiling and degreasing → assembling of qualified parts and an upper end socket on one side → nondestructive testing → assembling and welding pipe joints according to drawings and processes, welding a liquid conveying pipeline and a pressure test process for carrying out a pressure test, and inspecting to be qualified → connecting a vacuum unit to complete an inner container vacuumizing process → helium mass spectrum leakage detection.
Description
Technical Field
The invention is suitable for the fields of aerospace, scientific research colleges, industrial manufacturing, medical treatment, animal husbandry and the like, and particularly relates to a manufacturing and welding process of the inner containers of low-temperature liquid storage tanks.
Background
An inner container of the CFL-15/0.8 low-temperature liquid storage tank is provided with no hole device in the welding and nondestructive testing process; therefore, welding and nondestructive testing are both applied by adopting special processes, otherwise, the requirements of standards and patterns cannot be met, and the requirements of GB/T18442-2011 fixed vacuum heat insulation deep cooling pressure vessel on the manufacturing of the inner vessel are not met.
Disclosure of Invention
Therefore, in order to solve the defects, the invention provides inner container manufacturing and welding processes for the low-temperature liquid storage tank, a special welding process and a nondestructive testing process are programmed, and the requirements of meeting standards and processes for welding the inner container are met.
The invention is realized in such a way that the manufacturing and welding process for the inner container of low-temperature liquid storage tanks is constructed, and is characterized in that the process flow is as follows, warehouse entry inspection is completed according to drawings and standards, a barrel 1 and a barrel 2 are rolled according to drawings and manufacturing processes, the barrel 1 and the barrel 2 are welded together by a welding process, the barrel 1 and the barrel 2 are welded together, and the assembly and the butt joint are performed, namely, welding → nondestructive detection → double-side welding of the assembly of a lower end socket and the barrel 1 and 2 → nondestructive detection → the qualified part, the upper end socket and a pipeline pipe are cleaned and soaked by carbon tetrachloride, so that the requirements of deoiling and degreasing are met, the qualified part and the upper end socket are assembled together by single-side welding → nondestructive detection → welding of the assembly of the pipe joint according to drawings and processes, the infusion pipeline is welded, the pressure test process is performed by a pneumatic test, the inspection is qualified → the connection of.
The invention has the following advantages: evaluating the welding process of the container in the CFL-15/0.8 low-temperature liquid storage tank, compiling the welding process, welding tools and equipment, and performing nondestructive testing on the process and the equipment to meet the structure and the application of the product; the welding process is high in working efficiency, good in quality, advanced in structure and convenient to operate, can meet the use requirements of users in different environments, avoids large containers, fills argon gas in a full volume and flows, wastes the argon gas in the process of protecting the back of a welding seam, reduces the manufacturing cost of products, and improves the stability and reliability of production enterprises on the quality of final products.
Drawings
FIG. 1 is a schematic view of the welding of the vessels within the cryogenic liquid storage tank of the present invention.
Detailed Description
The present invention will be described in detail below with reference to fig. 1, wherein the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiment is only a partial embodiment of of the present invention, rather than a complete embodiment.
The invention provides manufacturing and welding processes of inner containers of low-temperature liquid storage tanks by improvement, wherein the special tool and equipment for the inner containers of the CFL-15/0.8 low-temperature liquid storage tanks comprise:
1) WS (M) 315 IGBT inversion type DC pulse argon arc welding machine,
2) an argon gas conveying device; (made of stainless steel pipe, back protective cover structure with weld joint)
3) Argon with purity of 99.99 percent; (weld protection for welding)
4) An electric roller frame; (PLC frequency conversion control realizing stepless speed regulation)
5) B81140A/112 m edge planer; (Special equipment for processing welding seam groove before cylinder rolling)
6) 3.4 m vertical lathe; (groove processing of Container end socket)
7) Nondestructive testing equipment (X-ray flaw detector, circumferential machine model: XXG 3005; the type of the orientation machine: XXG 3505)
8) An air compressor; (for container air pressure test, 0-1.3 MPa)
9) Helium mass spectrometer leak detector ZLS-23B; (for vacuum test of leakage parameters after pressure test of vessel)
The method is characterized by comprising the following main technical parameters:
1) WS (M) 315 IGBT inversion type direct current pulse argon arc welding machine;
2) the argon is pushed under the pressure of 0.3-0.5MPa, and the back of the welding line is effectively protected in the welding process through the manufactured gas transmission pipeline and the conical cover;
3) argon with purity of 99.99 percent; (provides weld bead protection for welding);
4) 20 tons of electric roller frames; (PLC frequency conversion control realizes stepless speed regulation, and the linear speed is 0-1 m/min);
5) B81140A/112 m edge planer; planing the longest dimension of the steel plate to 12 m;
6) turning the maximum diameter of the workpiece to be 3.4 meters;
7) x-ray flaw detector, orienting machine model: XXG3505 maximum irradiation steel plate thickness, 49mm, can realize the inner container of no manhole, the image of single wall ghost. The circumferential machine model is XXG 3005:
8) the air compressor is 0-1.3 MPa;
9) helium mass spectrometer leak detector ZLS-23B.
The principle and the process flow are as follows: the method comprises the steps of purchasing an inner container end socket outside a CFL-15/0.8 low-temperature liquid storage tank, providing a material quality certificate, a heat treatment curve chart, a supervision and inspection certificate provided by local pan inspection by a manufacturer, finishing warehousing inspection according to drawings and standards, finishing barrel 1 and barrel 2 rolling according to drawings and manufacturing processes, finishing longitudinal seam welding of the barrel 1 and the barrel 2 according to a welding process, comparing the barrel 1 and the barrel 2 → nondestructive testing (X-ray inspection, welding seam numbers 1-1 and 1-2), assembling and butting the barrel 1 and the barrel 2, welding → nondestructive testing (X-ray inspection, welding seam numbers 2-2), assembling a lower end socket and the barrel 1 and 2, double-sided welding → nondestructive testing (X-ray inspection, and (4) numbering welding seams: 2-1) → the qualified part, an upper end enclosure and a pipeline are cleaned and soaked by carbon tetrachloride to meet the requirements of deoiling and degreasing → the qualified part and the upper end enclosure are assembled and welded in a single surface (no manhole, single-surface welding is adopted, argon arc welding bottoming and manual welding rod arc welding are adopted, a special argon conveying device is adopted to carry out oxidation protection on the back surface of a welding seam) → nondestructive testing (X-ray flaw detection, welding seam numbering: 2-3), assembling a welded pipe joint according to drawings and processes, welding a transfusion pipeline, carrying out a pressure test according to a pressing force test process, checking to be qualified → connecting a vacuum unit, completing an inner container vacuumizing process → helium mass spectrum leakage detection.
The method is characterized in that: evaluating the welding process of the container in the CFL-15/0.8 low-temperature liquid storage tank, compiling the welding process, welding tools and equipment, and performing nondestructive testing on the process and the equipment to meet the structure and the application of the product; the welding process is high in working efficiency, good in quality, advanced in structure and convenient to operate, can meet the use requirements of users in different environments, avoids large containers, fills argon gas in a full volume and flows, wastes the argon gas in the process of protecting the back of a welding seam, reduces the manufacturing cost of products, and improves the stability and reliability of production enterprises on the quality of final products.
Thirdly, main technical parameters:
1. the working pressure of the container is as follows: the inner container is less than or equal to 0.8 MPa;
2. design pressure of the container: the inner container is 0.84 MPa;
3. the working temperature of the container is as follows: the inner container is more than or equal to 196 ℃ below zero;
4. the design temperature of the container is as follows: an inner container 196 ℃;
5. welding joint coefficients inner vessel 11;
6. full volume inner container of 15.79 m3；
7. The filling coefficient of the inner container is less than or equal to 0.95;
8. effective volume of inner container 15 m3；
9. Static evaporation rate is less than or equal to 0.500%. d-1；
10. The leakage and deflation rate is less than or equal to 6 multiplied by 10-5Pa.M3.S-1；
11. Pressure of air pressure test: the inner container is 1.04 MPa;
12. and (4) performing air tightness test, namely detecting leakage of helium mass spectrum.
Description of the process operation:
1. a low-temperature liquid storage tank manufacturing enterprise purchases an inner container end socket according to GB/T25198-2010 pressure container end socket, purchases raw materials according to GB 2451-2009, stainless steel plates and steel strips for pressure equipment, manufactures a cylinder, and also can manufacture an end socket blank and send the end socket blank to a stamping manufacturer for outsourcing; the finished end enclosure should contain, 1) a material quality certificate; 2) monitoring and verifying certificates; 3) a certificate of authenticity containing verification data;
2. and calculating the expansion length of the cylinder body, namely the length of a neutral layer of the cylinder body according to the outer circumference of the end socket as a reference, considering the welding shrinkage of lengthening 2-6mm, fully and reasonably discharging materials and improving the material utilization rate.
3. Discharging an inner container barrel, planning a groove, pre-bending two ends of a steel plate into a pattern curvature, rolling and forming, welding a longitudinal seam according to a welding process, rounding a rolled plate, and numbering according to a nondestructive testing process weld joint: 1-1, 1-2, performing nondestructive testing, and entering the next sequence if qualified. Barrel 1 and barrel 2 go on, assemble and weld, the welding seam serial number: 2-2, the nondestructive testing is qualified and the assembly is required;
4. and (3) assembling lower end sockets and barrel 1 and 2 parts, and numbering weld joints according to a double-sided welding process: 2-1, performing nondestructive testing, and after the product is qualified; the inner wall of the part and the inner surface of the upper end enclosure are polished, and the grease and the oxide layer on the metal surface are removed by carbon tetrachloride.
5. And assembling the component and the upper end socket, adopting a connecting tool to reduce the influence on the welding seam groove, and installing a welding seam number 2-3 back argon protection device. And finishing the welding of the welding seams with the numbers of 2-3 according to the requirements of the welding process.
6. According to the nondestructive testing process, nondestructive testing is completed on the welding seams (longitudinal seams 1-1, 1-2, circular seams 2-1, 2-2, 2-3) of the inner container main body, and the qualification requirements are as follows: RT-II-AB detection rate: 100 percent.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Claims (1)
1, manufacturing and welding processes of inner containers of low-temperature liquid storage tanks are characterized in that the manufacturing and welding processes comprise the following process flows of completing warehousing inspection according to drawings and standards → completing rolling of a barrel 1 and a barrel 2 according to drawings and a manufacturing process → completing longitudinal seam welding of the barrel 1 and the barrel 2 → comparing the barrel 1 and the barrel 2 → nondestructive inspection → assembling and butting of the barrel 1 and the barrel 2, welding → nondestructive inspection → double-side welding of a lower end socket and the barrel 1 and 2 assembly → nondestructive inspection → cleaning and soaking of qualified parts, an upper end socket and pipeline pipes by carbon tetrachloride, so that the requirements of deoiling and degreasing are met → assembling of the qualified parts and the upper end socket → nondestructive inspection → assembling of pipe joints according to drawings and processes, welding of infusion pipelines, performing a pressure test by a pressing force test process, inspecting qualified → connecting a vacuum unit, and completing the vacuum pumping process of the inner containers → helium mass spectrum leakage detection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911042523.1A CN110732753A (en) | 2019-10-30 | 2019-10-30 | Welding process for manufacturing inner container of low-temperature liquid storage tanks |
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| CN201911042523.1A CN110732753A (en) | 2019-10-30 | 2019-10-30 | Welding process for manufacturing inner container of low-temperature liquid storage tanks |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111702412A (en) * | 2020-04-22 | 2020-09-25 | 安徽帮德电气有限公司 | Manufacturing method of pressure container |
| CN112247316A (en) * | 2020-09-07 | 2021-01-22 | 江阴市富仁高科股份有限公司 | Welding process of pressure container |
| CN118544020A (en) * | 2024-07-30 | 2024-08-27 | 山东奥扬新能源科技股份有限公司 | Bottom sealing welding structure of hydrogen gas storage bottle |
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