CN104308382A - Connection method and connection structure of austenitic stainless steel pressure pipeline - Google Patents
Connection method and connection structure of austenitic stainless steel pressure pipeline Download PDFInfo
- Publication number
- CN104308382A CN104308382A CN201410484166.5A CN201410484166A CN104308382A CN 104308382 A CN104308382 A CN 104308382A CN 201410484166 A CN201410484166 A CN 201410484166A CN 104308382 A CN104308382 A CN 104308382A
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- CN
- China
- Prior art keywords
- straight pipe
- elbow
- short
- welding
- solution treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a connecting method and a connecting structure of an austenitic stainless steel pressure pipeline under a high-temperature operation working condition. During installation, two ends of the elbow are respectively welded with the two short straight pipe sections to obtain a prefabricated part; then carrying out solid solution treatment on the prefabricated part to enable welding seams between the elbow and the short straight pipe section to be solid solution treatment welding seams, and carrying out nondestructive testing on the solid solution treatment welding seams to ensure that the welding seams are qualified in quality; and finally, welding the two short straight pipe sections in the prefabricated member with the first long straight pipe and the second long straight pipe respectively by a conventional welding method. The method ensures that the carbide and the sigma phase which are sensitized and precipitated by welding the welding seam of the high stress area at the joint of the elbow end and the straight pipe are dissolved, improves the joint strength of the elbow joint and greatly reduces the possibility of reheat cracks. In addition, the invention places the welding seam which can not be subjected to solution treatment on site in the straight pipe section with lower stress level, thereby ensuring the safety of pipeline connection, reducing the welding difficulty and ensuring the welding quality.
Description
Technical field
The invention belongs to Austenitic Stainless Steel Pressure pipeline construction field, relate to a kind of method of attachment and the syndeton thereof that are applicable to Austenitic Stainless Steel Pressure pipeline under hot operation operating mode.
Background technology
In prior art, Austenitic Stainless Steel Pressure pipeline is in-site installation, the mounting means of the elbow junction of pressure pipeline usually as shown in Figure 1, the two ends of elbow 10 directly with the first long straight tube 30a and the second long straight tube 30b by being welded together, the weld seam between elbow 10 and the first long straight tube 30a and the weld seam between elbow 10 and the second long straight tube 30b are normal weld B.This mounting means will cause following defect: due to elbow end directly with long straight tube welding, commissure stress level between elbow and long straight tube is higher, under hot operation operating mode, the commissure between elbow and long straight tube easily produces austenitic stainless steel and runs reheat crack(ing).
In order to improve the bonding strength of commissure between elbow and long straight tube, improve its toughness and etch resistant properties, eliminating material sensitization in welding process brings carbide to separate out with σ phase, can carry out solution treatment to the weld seam between elbow and long straight tube, but in-site installation there is no that condition butt welded seam carries out solution treatment.In addition, even if can carry out solution treatment by butt welded seam at the scene, processing cost is also higher, and the processing time is also longer, and this will reduce production efficiency greatly, delays the set-up time.
Therefore, how improving the bearing strength of weld seam between elbow and long straight tube, ensure the operation that Austenitic Stainless Steel Pressure pipeline can be continual and steady, is the technical problem that those skilled in the art make great efforts to solve always.
Summary of the invention
An object of the present invention is to overcome above-mentioned the deficiencies in the prior art, a kind of method of attachment of the Austenitic Stainless Steel Pressure pipeline be applicable under hot operation operating mode is provided, this method of attachment not only significantly improves the bonding strength of commissure between elbow and long straight tube, also ensure that speed of application, ensure that the operation that Austenitic Stainless Steel Pressure pipeline can be continual and steady.
For achieving the above object, the technical solution adopted in the present invention is:
A method of attachment for Austenitic Stainless Steel Pressure pipeline, it comprises the following steps:
S1, the two ends of elbow are welded together with two short and straight pipe sections respectively obtain prefabricated component;
S2, solution treatment is carried out to prefabricated component, make the weld seam between elbow and two short and straight pipe sections be solution treatment weld seam, and Non-Destructive Testing is carried out to solution treatment weld seam guarantee that weldquality is qualified;
S3, by the short and straight pipe section of two in prefabricated component, long straight tube and the second long straight tube are welded together by conventional soldering method with first respectively.
The internal diameter of described two short and straight pipe sections is all identical with the internal diameter of elbow, and the length of two short and straight pipe sections is 3 ~ 5 times with the ratio of himself internal diameter.
The austenitic stainless steel material trade mark that pressure pipeline uses is A312-TP321H.
Two of object of the present invention is to provide a kind of syndeton adopting aforementioned method of attachment to obtain, this syndeton at the two ends of elbow respectively with two short and straight pipe sections by being welded together, and the weld seam between described elbow and short and straight pipe section is the weld seam through solution treatment; Long straight tube and the second long straight tube are by being welded together with first respectively away from one end of elbow for described two short and straight pipe sections, and the weld seam between short and straight pipe section and the first long straight tube and the weld seam between short and straight pipe section and the second long straight tube are normal weld.
Beneficial effect of the present invention is:
1) in the method for attachment, in the present invention, first elbow and two short and straight pipe sections are welded together and obtain prefabricated component, then solution treatment is carried out to prefabricated component, prefabricated component after solution treatment is transported to erecting bed after Non-Destructive Testing is qualified, finally by the two ends of the prefabricated component after solution treatment respectively with two long straight tubes by being welded together.
First this method enhances the welding quality of elbow ends commissure, improves bonding strength and the bearing capacity of elbow junction, significantly reduces the possibility that reheat crack(ing) occurs; Secondly, the normal weld at elbow two ends of the prior art is replaced with the normal weld at prefabricated component two ends by the present invention, also the weld seam that namely solution treatment cannot be carried out in scene by the present invention has been placed on the lower straight length of stress level, not only ensure that the security that pipeline connects, and reduce welding difficulty, also ensure that welding quality.
2) prefabricated component, in method of attachment of the present invention can carry out solution treatment in makers' Solution Treatment Furnace, also the prefabricated component namely in the present invention is not produced at the scene, but in the factory prefabricated deliver to field erected, this processing mode can reduce difficulty of construction greatly, significantly improves installation rate.
3), the present invention is not only applicable to the design and installation of new pressure pipeline, is also applicable to transformation or the reconstruction of existing pressure pipeline completely.
Accompanying drawing explanation
Fig. 1 is the syndeton schematic diagram at pressure pipeline elbow place in prior art.
Fig. 2 is structural representation of the present invention.
Reference numeral implication in figure is as follows:
10-elbow 20a/20b-short and straight pipe section
The long straight tube of 30a-the first long straight tube 30b-the second
A-solution treatment weld seam B-normal weld
Detailed description of the invention
Below in conjunction with drawings and Examples, the inventive method is described further.
As shown in Figure 2, the austenitic stainless steel material trade mark that pressure pipeline in the present invention uses is A312-TP321H, one end of elbow 10 and short and straight pipe section 20a are by being welded together, the other end of elbow 10 and short and straight pipe section 20b are by being welded together, described elbow 10 and the weld seam between two short and straight pipe sections 20a, 20b are the weld seam through solution treatment, and also namely elbow 10 and the weld seam between two short and straight pipe sections 20a, 20b are solution treatment weld seam A; Described short and straight pipe section 20a away from one end of elbow 10 and the first long straight tube 30a by being welded together, short and straight pipe section 20b is away from one end of elbow 10 and the second long straight tube 30b by being welded together, and the weld seam between short and straight pipe section 20a and the first long straight tube 30a and the weld seam between short and straight pipe section 20b and the second long straight tube 30b are normal weld B.
The internal diameter of described two short and straight pipe sections 20a, 20b is all identical with the internal diameter of elbow 10, and the length of any one short and straight pipe section in two short and straight pipe sections 20a, 20b is 3 times with the ratio of himself internal diameter.
Above-mentioned syndeton is installed by following steps:
S1, the two ends of elbow 10 are welded together with two short and straight pipe sections 20a, 20b respectively obtain prefabricated component;
S2, solution treatment is carried out to prefabricated component, make elbow 10 and the weld seam between two short and straight pipe sections 20a, 20b be solution treatment weld seam A, and Non-Destructive Testing is carried out to solution treatment weld seam A guarantee that weldquality is qualified;
S3, prefabricated component is delivered to scene, and long straight tube 30a and the second long straight tube 30b is welded together by conventional soldering method with first respectively to make in prefabricated component two short and straight pipe sections 20a, 20b.
Claims (4)
1. a method of attachment for Austenitic Stainless Steel Pressure pipeline, is characterized in that comprising the following steps:
S1, the two ends of elbow (10) are welded together with two short and straight pipe sections (20a, 20b) respectively obtain prefabricated component;
S2, solution treatment is carried out to prefabricated component, make the weld seam between elbow (10) and two short and straight pipe sections (20a, 20b) be solution treatment weld seam (A), and Non-Destructive Testing is carried out to solution treatment weld seam (A) guarantee that weldquality is qualified;
S3, by the short and straight pipe section of two in prefabricated component (20a, 20b), long straight tube (30a) and the second long straight tube (30b) are welded together by conventional soldering method with first respectively.
2. the method for attachment of Austenitic Stainless Steel Pressure pipeline according to claim 1, it is characterized in that: the internal diameter of described two short and straight pipe sections (20a, 20b) is all identical with the internal diameter of elbow (10), and the length of two short and straight pipe sections (20a, 20b) is 3 ~ 5 times with the ratio of himself internal diameter.
3. the method for attachment of Austenitic Stainless Steel Pressure pipeline according to claim 1 and 2, is characterized in that: the austenitic stainless steel material trade mark that pressure pipeline uses is A312-TP321H.
4. the syndeton obtained by method of attachment of the Austenitic Stainless Steel Pressure pipeline according to any one of claims 1 to 3, it is characterized in that: the two ends of elbow (10) respectively with two short and straight pipe sections (20a, 20b) by being welded together, and the weld seam between described elbow (10) and short and straight pipe section is the weld seam through solution treatment; Long straight tube (30a) and the second long straight tube (30b) are by being welded together with first respectively away from one end of elbow (10) for described two short and straight pipe sections (20a, 20b), and the weld seam between short and straight pipe section and the first long straight tube (30a) and the weld seam between short and straight pipe section and the second long straight tube (30b) are normal weld.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410484166.5A CN104308382B (en) | 2014-09-19 | 2014-09-19 | Connection method and connection structure of austenitic stainless steel pressure pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410484166.5A CN104308382B (en) | 2014-09-19 | 2014-09-19 | Connection method and connection structure of austenitic stainless steel pressure pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104308382A true CN104308382A (en) | 2015-01-28 |
| CN104308382B CN104308382B (en) | 2017-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410484166.5A Active CN104308382B (en) | 2014-09-19 | 2014-09-19 | Connection method and connection structure of austenitic stainless steel pressure pipeline |
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| Country | Link |
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| CN (1) | CN104308382B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834605A (en) * | 2016-04-20 | 2016-08-10 | 江南造船(集团)有限责任公司 | Welding method for two-layer pipe elbow |
| CN109079361A (en) * | 2018-09-11 | 2018-12-25 | 中国化学工程第六建设有限公司 | Stainless steel pipes exempt from argon gas welding procedure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256252A (en) * | 1979-02-26 | 1981-03-17 | Thermatool Corp. | Soldering apparatus |
| JPH11294649A (en) * | 1998-04-08 | 1999-10-29 | Osaka Gas Co Ltd | Facility for treating low-temperature material |
| EP2154413A1 (en) * | 2008-08-08 | 2010-02-17 | GE-Hitachi Nuclear Energy Americas LLC | Apparatus and method for repairing welded elbow joints in a core spray line |
| CN101691895A (en) * | 2009-11-03 | 2010-04-07 | 烟台台海玛努尔核电设备有限公司 | Manufacturing process for main pipe line of primary loop in AP1000 nuclear power technology |
| CN201981238U (en) * | 2011-01-30 | 2011-09-21 | 苏州热工研究院有限公司 | Solution treatment heating device for stainless steel bent pipe |
| CN202252472U (en) * | 2011-09-30 | 2012-05-30 | 温岭市钱江化工机械有限公司 | Pressure pipeline connection structure |
-
2014
- 2014-09-19 CN CN201410484166.5A patent/CN104308382B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256252A (en) * | 1979-02-26 | 1981-03-17 | Thermatool Corp. | Soldering apparatus |
| JPH11294649A (en) * | 1998-04-08 | 1999-10-29 | Osaka Gas Co Ltd | Facility for treating low-temperature material |
| EP2154413A1 (en) * | 2008-08-08 | 2010-02-17 | GE-Hitachi Nuclear Energy Americas LLC | Apparatus and method for repairing welded elbow joints in a core spray line |
| CN101691895A (en) * | 2009-11-03 | 2010-04-07 | 烟台台海玛努尔核电设备有限公司 | Manufacturing process for main pipe line of primary loop in AP1000 nuclear power technology |
| CN201981238U (en) * | 2011-01-30 | 2011-09-21 | 苏州热工研究院有限公司 | Solution treatment heating device for stainless steel bent pipe |
| CN202252472U (en) * | 2011-09-30 | 2012-05-30 | 温岭市钱江化工机械有限公司 | Pressure pipeline connection structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834605A (en) * | 2016-04-20 | 2016-08-10 | 江南造船(集团)有限责任公司 | Welding method for two-layer pipe elbow |
| CN105834605B (en) * | 2016-04-20 | 2018-05-15 | 江南造船(集团)有限责任公司 | The welding method of double-deck pipe bend |
| CN109079361A (en) * | 2018-09-11 | 2018-12-25 | 中国化学工程第六建设有限公司 | Stainless steel pipes exempt from argon gas welding procedure |
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| Publication number | Publication date |
|---|---|
| CN104308382B (en) | 2017-03-01 |
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Address after: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE Co.,Ltd. Address before: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee before: HEFEI GENERAL MACHINERY Research Institute |