CN107953011B - Assembly welding method for oil pipeline of underwater Christmas tree - Google Patents
Assembly welding method for oil pipeline of underwater Christmas tree Download PDFInfo
- Publication number
- CN107953011B CN107953011B CN201711176267.6A CN201711176267A CN107953011B CN 107953011 B CN107953011 B CN 107953011B CN 201711176267 A CN201711176267 A CN 201711176267A CN 107953011 B CN107953011 B CN 107953011B
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- welding
- holes
- connecting seat
- pipeline body
- positioning
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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
- B23K9/02—Seam welding; Backing means; Inserts
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/10—Pipe-lines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses an assembling and welding method for an oil pipeline of an underwater Christmas tree, which comprises the following steps: 1) placing the auxiliary tool according to the welding position, and respectively installing a connecting seat on two groups of holes predetermined on the upper surface of the tool base; 2) connecting the two welding neck flanges to the connecting seats on the side where the two welding neck flanges are located respectively; 3) assembling a pipeline body; adjusting gaps between two ports of the pipeline body and the interfaces of the two welding neck flanges, and respectively carrying out alignment by using the two alignment devices; 4) performing all-position welding of a root welding bead by adopting a tungsten electrode argon arc welding method; before welding, continuously introducing back protective gas into the inner cavity of the pipeline body from the vent hole of the connecting seat at one end, stopping introducing the back protective gas after welding for 2-3 layers, and detaching the two port aligning devices; 5) performing full-position filling welding and cover surface welding by adopting an electric arc welding method; 6) and (5) removing the auxiliary tool after the welding line is cooled to the ambient temperature, and thus obtaining the welding line. The method of the invention has high welding quality and meets the requirement of precision.
Description
Technical Field
The invention belongs to the technical field of equipment manufacturing, and relates to an assembling and welding method for an oil pipeline of an underwater Christmas tree.
Background
The underwater oil delivery pipe of the Christmas tree is one of key parts of the Christmas tree, needs to bear larger pressure in the use process, and structurally comprises a pipe body and a welding neck flange which are welded in a full penetration mode, so that the welding seam quality requirement is high; the oil pipeline is connected with an adjacent part through a flange, and the metal sealing gasket ring is used for sealing, so that the precision requirement on the oil pipeline is particularly high, and the fine deformation can cause the sealing failure and medium leakage.
Under the prior art, due to the compact structure of the underwater Christmas tree, the on-site welding method is adopted, so that the operation space is insufficient, and the welding seam quality cannot be ensured; due to the fact that the pipe diameter is small, the wall thickness is large, welding deformation is large when welding is conducted by a conventional method, the center line of the flange deflects relative to the axis of the oil pipeline body, the end face of the flange is not perpendicular to the axis of the oil pipeline body, the length dimension and the relative position error of the flange bolt holes at two ends are large, and assembly quality and sealing performance are seriously affected; and is limited by the structure, and cannot be manufactured by adopting the method of integral machining after assembly welding. Therefore, it is urgently needed to develop an assembly welding method for the oil pipeline of the underwater Christmas tree to overcome the above defects.
Disclosure of Invention
The invention aims to provide an assembling and welding method for an oil pipeline of an underwater Christmas tree, which solves the problems that in the prior art, the oil pipeline of the underwater Christmas tree is difficult to assemble and weld on site and the precision requirement of the pipeline cannot be ensured.
The technical scheme adopted by the invention is that the method for assembling and welding the oil pipeline of the underwater Christmas tree is implemented according to the following steps:
adjusting gaps between two ports of the pipeline body and the interfaces of the two welding neck flanges, and respectively aligning the ports by using the two port aligners to realize the positioning of the two ports of the pipeline body and the two welding neck flanges;
before welding, continuously introducing back protective gas into the inner cavity of the pipeline body from the vent hole of the connecting seat at one end, stopping introducing the back protective gas after welding for 2-3 layers, and detaching the two port aligning devices;
and 6, after the electric arc welding is finished, cooling the to-be-welded joint to the ambient temperature, and then removing the auxiliary tool to obtain the welding wire.
The method has the advantages of simple operation, good welding seam quality and high pipeline precision, and solves the problems that the on-site welding of the oil pipeline of the underwater Christmas tree is difficult and the precision requirement of the pipeline cannot be ensured by the conventional method; the auxiliary tool is of a split type combined structure, positioning holes and bolt holes are machined in advance in proper positions on the tool base according to needs when the auxiliary tool is used, the auxiliary tool is suitable for positioning oil pipelines of different sizes, and the universality is good.
Drawings
FIG. 1 is a schematic view of the combined state of the oil delivery lines of the subsea tree of the present invention;
fig. 2 is an expanded sectional view a-a of fig. 1.
In the figure, 1, a pipeline body, 2, a welding neck flange, 3, a connecting seat, 4, a tool base and 5, a mouth aligning device.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses an assembling and welding method of an oil pipeline of an underwater Christmas tree, which comprises the steps of firstly respectively manufacturing a pipeline body 1 and a welding neck flange 2 by adopting a conventional manufacturing method, manufacturing an auxiliary tool, then completing the alignment and positioning of the pipeline body 1 and the welding neck flange 2 by utilizing the auxiliary tool and an alignment device 5, and finally welding.
Referring to fig. 1 and 2, the auxiliary tool is structurally characterized by comprising a tool base 4 and a butt joint device 5, wherein the tool base 4 is of a square box structure, two groups of holes are formed in the upper surface of the tool base 4 in advance according to the bending direction of an oil pipeline, each group of holes comprises two bolt holes and two positioning holes, the two bolt holes and the two positioning holes are located at four corners of a rectangle and are arranged in a pairwise diagonal crossing manner, each group of holes is fixedly connected with a connecting seat 3 through bolts and positioning pins, and two connecting seats 3 are installed in total; four holes (comprising two bolt holes and two positioning holes) are respectively formed in the horizontal plane and the vertical plane of each connecting seat 3, the four holes in the horizontal plane are matched with a group of holes in the tooling base 4 and are used for being connected with the tooling base 4, the four holes in the vertical plane are matched with mounting holes in the welding neck flange 2 and are used for being connected with the welding neck flange 2, and a vent hole is formed in the center position of the four bolt holes in the vertical plane of one connecting seat 3.
The invention relates to an assembling and welding method of an oil pipeline of an underwater Christmas tree, which is implemented according to the following steps:
when the connecting seat 3 is installed, after the diagonal through positioning pin is adopted for positioning, the diagonal through bolt is firmly fastened;
when the welding neck flange 2 is installed, after the welding neck flange is positioned by adopting a diagonally-through positioning pin, the welding neck flange is firmly fastened by diagonally-through bolts, as shown in figure 2;
adjusting gaps between two ports of the pipeline body 1 and the interfaces of the two welding neck flanges 2, wherein the gaps are required to be 2-3 mm and meet the process requirements, and then respectively aligning the ports by using the two aligning devices 5 to realize the positioning of the two ports of the pipeline body 1 and the two welding neck flanges 2;
the technological parameters of the argon tungsten-arc welding method are as follows: welding wires: AWS A5.9ER2209, current is 100-110A, voltage is 10-11V, and welding speed is 3.5-5 cm/min;
before welding, continuously introducing back protection gas a (Ar gas) into the inner cavity of the pipeline body 1 from the vent hole of the connecting seat 3 at one end, stopping introducing the back protection gas a after welding for 2-3 layers, and detaching the two port aligning devices 5;
and 5, performing full-position filling welding and cover surface welding by adopting a (manual) arc welding method, wherein the process parameters of the arc welding are as follows: welding rods: AWS A5.4ER2209-15, the current is 95-105A, the voltage is 19-21V, and the welding speed is 8-9 cm/min;
and 6, after the electric arc welding is finished, cooling the to-be-welded joint to the ambient temperature, and then removing the auxiliary tool to obtain the welding wire.
Examples
The material of the pipeline body 1 is: the steel pipe phi 168X24/S32205 is made of the following materials: s32205.
Referring to fig. 1 and 2, the general process is that a pipeline body 1 and a welding neck flange 2 are manufactured respectively by a conventional manufacturing method, a finished product is processed by a composite groove with a truncated edge of 1.6 mm plus or minus 0.6mm, then the auxiliary tool and the mouth aligner 5 are used for completing the combination and positioning of the pipeline body 1 and the two welding neck flanges 2, and then the welding is carried out step by step.
Claims (2)
1. An underwater Christmas tree oil pipeline assembly welding method utilizes an auxiliary tool, the auxiliary tool is structurally characterized by comprising a tool base (4) and a mouth aligning device (5), the tool base (4) is of a square box body structure, two groups of holes are formed in the upper surface of the tool base (4) in advance according to the bending direction of an oil pipeline, each group of holes comprises two bolt holes and two positioning holes, the two bolt holes and the two positioning holes are located at the four corners of a rectangle and are arranged in a pairwise diagonal crossing mode, each group of holes is fixedly connected with a connecting seat (3) through bolts and positioning pins, and two connecting seats (3) are installed in total; four holes are respectively arranged on the horizontal plane and the vertical plane of each connecting seat (3), the four holes on the horizontal plane are matched with a group of holes on the tooling base (4) for connecting the tooling base (4), the four holes on the vertical plane are matched with mounting holes on the welding neck flange (2) for connecting the welding neck flange (2),
the method is characterized by comprising the following steps:
step 1, placing an auxiliary tool according to the welding position, respectively installing a connecting seat (3) on two groups of holes predetermined on the upper surface of a tool base (4),
when the connecting seat (3) is installed, after the diagonal through positioning pin is adopted for positioning, the diagonal through bolt is firmly fastened;
step 2, connecting the two welding neck flanges (2) to the connecting seat (3) on one side respectively,
when the welding neck flange (2) is installed, after the welding neck flange is positioned by a diagonally-through positioning pin, the welding neck flange is firmly fastened by diagonally-through bolts;
step 3, assembling the pipeline body (1);
adjusting gaps between the two ports of the pipeline body (1) and the interfaces of the two welding neck flanges (2), and respectively aligning the ports by using the two aligning devices (5) to realize the positioning of the two ports of the pipeline body (1) and the two welding neck flanges (2);
step 4, performing all-position welding of a root weld bead by adopting a tungsten electrode argon arc welding method;
before welding, continuously introducing back shielding gas into the inner cavity of the pipeline body (1) from the vent hole of the connecting seat (3) at one end, stopping introducing the back shielding gas after welding for 2-3 layers, removing the two mouth-aligning devices (5),
the technological parameters of the argon tungsten-arc welding method are as follows: welding wires: AWS A5.9ER2209, the current is 100-110A, the voltage is 10-11V, and the welding speed is 3.5-5 cm/min;
and 5, carrying out full-position filling welding and cover surface welding by adopting a shielded metal arc welding method, wherein the process parameters of the shielded metal arc welding are as follows: welding rods: AWS A5.4ER2209-15, current 95-105A, voltage 19-21V, and welding speed 8-9 cm/min;
and 6, after the welding rod arc welding is finished, cooling the to-be-welded joint to the ambient temperature, and then removing the auxiliary tool to obtain the welding rod.
2. The method for assembling and welding the oil pipeline of the subsea tree according to claim 1, wherein: and a vent hole is formed in the center of each of the four bolt holes on the vertical surface of one of the connecting seats (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711176267.6A CN107953011B (en) | 2017-11-22 | 2017-11-22 | Assembly welding method for oil pipeline of underwater Christmas tree |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711176267.6A CN107953011B (en) | 2017-11-22 | 2017-11-22 | Assembly welding method for oil pipeline of underwater Christmas tree |
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| Publication Number | Publication Date |
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| CN107953011A CN107953011A (en) | 2018-04-24 |
| CN107953011B true CN107953011B (en) | 2020-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711176267.6A Active CN107953011B (en) | 2017-11-22 | 2017-11-22 | Assembly welding method for oil pipeline of underwater Christmas tree |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2403540Y (en) * | 1999-08-23 | 2000-11-01 | 赵谦 | Pipe and flange abutting joint device |
| CN202411761U (en) * | 2011-12-13 | 2012-09-05 | 中冶天工集团有限公司 | Thick-wall pipeline aligning and welding seam adjusting device |
| CN202447851U (en) * | 2011-12-31 | 2012-09-26 | 扬州秋源压力容器制造有限公司 | Butt welding tool of connecting pipe and flange pipe |
| CN103537781A (en) * | 2012-07-10 | 2014-01-29 | 洪泽东俊机械有限公司 | Ocean Christmas tree pipeline automatic welding device |
| CN205496899U (en) * | 2016-03-29 | 2016-08-24 | 中化二建集团有限公司 | Heavy -calibre welding neck flange and pipe connection internal [line up] clamp |
| CN106141531A (en) * | 2015-04-14 | 2016-11-23 | 昆山安意源管道科技有限公司 | Elbow group is to special internal clamp |
| KR20170030683A (en) * | 2015-09-09 | 2017-03-20 | 대우조선해양 주식회사 | Method and apparatus for purging welding pipe |
-
2017
- 2017-11-22 CN CN201711176267.6A patent/CN107953011B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2403540Y (en) * | 1999-08-23 | 2000-11-01 | 赵谦 | Pipe and flange abutting joint device |
| CN202411761U (en) * | 2011-12-13 | 2012-09-05 | 中冶天工集团有限公司 | Thick-wall pipeline aligning and welding seam adjusting device |
| CN202447851U (en) * | 2011-12-31 | 2012-09-26 | 扬州秋源压力容器制造有限公司 | Butt welding tool of connecting pipe and flange pipe |
| CN103537781A (en) * | 2012-07-10 | 2014-01-29 | 洪泽东俊机械有限公司 | Ocean Christmas tree pipeline automatic welding device |
| CN106141531A (en) * | 2015-04-14 | 2016-11-23 | 昆山安意源管道科技有限公司 | Elbow group is to special internal clamp |
| KR20170030683A (en) * | 2015-09-09 | 2017-03-20 | 대우조선해양 주식회사 | Method and apparatus for purging welding pipe |
| CN205496899U (en) * | 2016-03-29 | 2016-08-24 | 中化二建集团有限公司 | Heavy -calibre welding neck flange and pipe connection internal [line up] clamp |
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| Publication number | Publication date |
|---|---|
| CN107953011A (en) | 2018-04-24 |
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Effective date of registration: 20201228 Address after: 721002 No.2 Dongfeng Road, Jintai District, Baoji City, Shaanxi Province Patentee after: Baoji Oilfield Machinery Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC national oil and gas drilling equipment Engineering Technology Research Center Co., Ltd Address before: 721002 No.2 Dongfeng Road, Jintai District, Baoji City, Shaanxi Province Patentee before: Baoji Oilfield Machinery Co.,Ltd. |