CN104308382B - 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
- CN104308382B CN104308382B CN201410484166.5A CN201410484166A CN104308382B CN 104308382 B CN104308382 B CN 104308382B CN 201410484166 A CN201410484166 A CN 201410484166A CN 104308382 B CN104308382 B CN 104308382B
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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
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, it is related to one kind and is applied to Austria under hot operation operating mode
The method of attachment of family name's body stainless steel pressure pipeline and its attachment structure.
Background technology
In prior art, Austenitic Stainless Steel Pressure pipeline is in-site installation, the peace of the elbow junction of pressure pipeline
Dress mode is generally as shown in figure 1, welding is directly passed through with the first long straight tube 30a and the second long straight tube 30b in the two ends of elbow 10
Link 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
It is normal weld B.This mounting means will lead to following defect：Because the end of elbow is direct and long straight tube welding, curved
Commissure stress level between head and long straight tube is higher, the commissure under hot operation operating mode, between elbow and long straight tube
Easily produce austenitic stainless steel and run 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, eliminate weldering
In termination process, material sensitization 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 carries out solution treatment to weld seam.Even if additionally, can carry out solid at the scene to weld seam
Molten process, processing cost is also higher, and process time is also longer, and this will substantially reduce production efficiency, delays the set-up time.
Therefore, how to improve the bearing strength of weld seam between elbow and long straight tube it is ensured that Austenitic Stainless Steel Pressure pipeline
Operation that can be continual and steady, is the technical problem that those skilled in the art make great efforts to solve always.
Content of the invention
An object of the present invention is to overcome above-mentioned the deficiencies in the prior art, provides one kind to be applied to hot operation operating mode
Under Austenitic Stainless Steel Pressure pipeline method of attachment, this method of attachment not only significantly improves between elbow and long straight tube weldering
Bonding strength at seam, also ensure that speed of application it is ensured that Austenitic Stainless Steel Pressure pipeline can be continual and steady operation.
For achieving the above object, the technical solution adopted in the present invention is：
A kind of method of attachment of 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 so that the weld seam between elbow and two short and straight pipe sections is solution treatment
Weld seam, and Non-Destructive Testing is carried out to solution treatment weld seam guarantee that weldquality is qualified；
S3, two short and straight pipe sections in prefabricated component are passed through normal welding side with the first long straight tube and the second long straight tube respectively
Method welds together.
The internal diameter all same of the internal diameter of described two short and straight pipe sections and elbow, and the length of two short and straight pipe sections and its own
The ratio of internal diameter is 3～5 times.
The austenitic stainless steel material trade mark that pressure pipeline is used is A312-TP321H.
The second object of the present invention is to provide a kind of attachment structure obtaining using aforementioned method of attachment, and this attachment structure exists
Pass through to be welded together with two short and straight pipe sections respectively in the two ends of elbow, and the weld seam between described elbow and short and straight pipe section
It is the weld seam through solution treatment；Described two short and straight pipe sections are long with the first long straight tube and second straight respectively away from one end of elbow
Gutron is crossed and is welded together, the weld seam between short and straight pipe section and the first long straight tube and short and straight pipe section and the second long straight tube it
Between weld seam be normal weld.
The beneficial effects of the present invention is：
1), in the method for attachment in the present invention, elbow and two short and straight pipe sections are welded together obtain prefabricated component first,
Then solution treatment is carried out to prefabricated component, the prefabricated component after solution treatment through Non-Destructive Testing qualified after be transported to erecting bed,
Finally passed through to be welded together with two long straight tubes respectively in the two ends of the prefabricated component after solution treatment.
This method enhances the welding quality of elbow ends commissure first, improve elbow junction bonding strength and
Bearing capacity, significantly reduces the probability of reheat crack(ing) appearance；Secondly, the present invention is by elbow two ends of the prior art
Normal weld replaces with the normal weld at prefabricated component two ends, namely the weld seam that scene cannot be carried out solution treatment is placed by the present invention
In the relatively low straight length of stress level, not only ensure that the safety that pipeline connects, and reduce welding difficulty, also ensure
Welding quality.
2), the prefabricated component in method of attachment of the present invention can carry out solution treatment in the Solution Treatment Furnace of maker,
I.e. the prefabricated component in the present invention is not produced at the scene, but prefabricated in the factory delivers to field erected, this process
Mode can substantially reduce difficulty of construction, significantly improves installation rate.
3), the present invention is not only applicable to the design and installation of new pressure pipeline, is also fully applicable for existing pressure pipeline
Transformation or reconstruction.
Brief description
Fig. 1 is the attachment structure schematic diagram at pressure pipeline elbow in prior art.
Fig. 2 is the structural representation of the present invention.
The reference implication of in figure is as follows：
10 elbow 20a/20b short and straight pipe sections
The long straight tube of the long straight tube 30b second of 30a first
A solution treatment weld seam B normal weld
Specific embodiment
With reference to the accompanying drawings and examples the inventive method is described further.
As shown in Fig. 2 the austenitic stainless steel material trade mark that the pressure pipeline in the present invention is used is A312-
TP321H, one end of elbow 10 and short and straight pipe section 20a pass through to be welded together, the other end of elbow 10 and short and straight pipe section
20b passes through to be welded together, and the weld seam between described elbow 10 and two short and straight pipe sections 20a, 20b is at solid solution
The weld seam of reason, namely the weld seam between elbow 10 and two short and straight pipe sections 20a, 20b is solution treatment weld seam A；Described short straight
Pipeline section 20a passes through to be welded together away from one end straight tube 30a long with first of elbow 10, and short and straight pipe section 20b is away from elbow
10 one end straight tube 30b long with second passes through to be welded together, the weldering between short and straight pipe section 20a and the first long straight tube 30a
Weld seam between seam and short and straight pipe section 20b and the second long straight tube 30b is normal weld B.
The internal diameter of described two short and straight pipe section 20a, 20b and the internal diameter all same of elbow 10, and two short and straight pipe section 20a,
The length of any one short and straight pipe section in 20b is 3 times with the ratio of its own internal diameter.
Above-mentioned attachment structure 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 so that the weld seam between elbow 10 and two short and straight pipe sections 20a, 20b is
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 make two short and straight pipe sections 20a, 20b in prefabricated component respectively with the first long straight tube
30a and the second long straight tube 30b is welded together by conventional soldering method.
Claims (3)
1. a kind of method of attachment of Austenitic Stainless Steel Pressure pipeline is it is characterised in that comprise 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 so that the weld seam between elbow (10) and two short and straight pipe sections (20a, 20b) is
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 two short and straight pipe sections (20a, 20b) in prefabricated component respectively with the first long straight tube (30a) and the second long straight tube
(30b) welded together by conventional soldering method；
The austenitic stainless steel material trade mark that pressure pipeline is used is A312-TP321H.
2. Austenitic Stainless Steel Pressure pipeline according to claim 1 method of attachment it is characterised in that：Described two short
The internal diameter of straight length (20a, 20b) and the internal diameter all same of elbow (10), and the length of two short and straight pipe sections (20a, 20b) and its
The ratio of itself internal diameter is 3～5 times.
3. the connection knot obtained by method of attachment of a kind of Austenitic Stainless Steel Pressure pipeline according to claim 1 and 2
Structure it is characterised in that：Pass through to be welded together with two short and straight pipe sections (20a, 20b) respectively in the two ends of elbow (10), and
Weld seam and short and straight pipe section between for the described elbow (10) is the weld seam through solution treatment；Described two short and straight pipe section (20a,
20b) one end away from elbow (10) is passed through to be welded to connect one with the first long straight tube (30a) and the second long straight tube (30b) respectively
Rise, 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)
It is 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 CN104308382A (en) | 2015-01-28 |
| CN104308382B true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256252A (en) * | 1979-02-26 | 1981-03-17 | Thermatool Corp. | Soldering apparatus |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3263027B2 (en) * | 1998-04-08 | 2002-03-04 | 大阪瓦斯株式会社 | Equipment for processing low-temperature substances |
-
2014
- 2014-09-19 CN CN201410484166.5A patent/CN104308382B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256252A (en) * | 1979-02-26 | 1981-03-17 | Thermatool Corp. | Soldering apparatus |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN104308382A (en) | 2015-01-28 |
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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 |