CN203401224U - LNG inner tank wallboard dynamic semi-automatic welding structure - Google Patents
LNG inner tank wallboard dynamic semi-automatic welding structure Download PDFInfo
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- CN203401224U CN203401224U CN201320429240.4U CN201320429240U CN203401224U CN 203401224 U CN203401224 U CN 203401224U CN 201320429240 U CN201320429240 U CN 201320429240U CN 203401224 U CN203401224 U CN 203401224U
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- 238000003466 welding Methods 0.000 title claims abstract description 109
- 239000000945 filler Substances 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 239000003949 liquefied natural gas Substances 0.000 description 17
- 239000011324 bead Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000013019 agitation Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 238000011981 development test Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model relates to an LNG inner tank wallboard dynamic semi-automatic welding structure, and belongs to the technical field of welding. The structure comprises adjacent wallboards forming an X-shaped welding groove in a butt welding portion of an LNG inner tank wallboard, the smallest gap of the X-shaped welding groove is 2-4mm, and the included angle of the groove is 45-55degrees. The LNG inner tank wallboard dynamic semi-automatic welding structure has the advantages of being higher in welding quality, high in welding speed, capable of saving welding materials, and flexible in field welding operation.
Description
Technical field
The utility model relates to a kind of Welding Structure, and the dynamic semiautomatic welding connecting structure of tank shell in especially a kind of LNG, belongs to welding technology field.
Background technology
Along with economic growth and social progress, to LNG(Liquefied Natural Gas liquefied natural gas) demand increase year by year.At present, domestic all built and in the LNG engineering of building, tank shell is on-the-spot installs except circumferential weld adopts submerged-arc welding, the traditional welding technique that all adopts stick electrode arc welding, not only welding job amount is large, and welding efficiency is low, welding deformation is large, working condition is poor, and labour intensity is high, and welding quality is difficult for guaranteeing, consumable quantity is large, and cost is high.
Retrieval is found, application number is that 200610121459.2 Chinese utility model patent discloses a kind of for large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method, diameter >=the 325MM of its pipeline, wall thickness is more than or equal to 40MM, step: make the opposed end of described pipeline mother metal form the front combination of weldering groove, bottoming welding is carried out in bottom to root root face and lower root face, lower root face and upper groove are filled to welding, described filling is welded as individual layer single-run welding, and cover welding is carried out in the top of upper groove, cover welding can adopt linear welding bead or weave bead.In addition; application number is that 201010283883.3 Chinese utility model patent discloses a kind of automatic welding method of nuclear island main pipes; pipe diameter >=325mm, wall thickness >=40mm; make the front combination of the opposed end group butt welding groove of pipeline mother metal; bottoming welding is carried out in bottom to root root face and lower root face, comprising: penetration bead, the first fusion welding bead, the second fusion welding bead, first support welding bead, the second support welding bead, the 3rd supports welding bead, the 4th and supports welding bead; Lower root face and upper groove are filled to welding, form filler pass; Recharge welding, form filler pass in latter stage; Carry out cover welding, adopt weave bead and/or stringer bead.
Above-mentioned patent has solved respectively the Welding Problems of posted sides pipeline with very concrete welding procedure, but and is not suitable for the LNG pipeline welding of the medium wall thickness in 20mm left and right.
Summary of the invention
The purpose of this utility model is: for the backward situation of prior art manual welding, propose a kind of dynamic semiautomatic welding connecting structure of the interior tank shell (the medium wall thickness in 20mm left and right) of LNG that can conscientiously meet the high-quality and efficient requirement of engineering, thereby adapt to developing rapidly of LNG receiving terminal station.
In order to achieve the above object, applicant is through development test repeatedly, in the LNG summing up, the dynamic semiautomatic welding connecting structure of tank shell comprises the adjacent wallboard that forms tank shell butt welding place X-type bevel for welding in LNG, and the minimum clearance of described X-type bevel for welding is 2-4mm; Groove angle is 45 °-55 °.
Further, the minimum clearance place of described X-type bevel for welding is backing run, and described backing run both sides are respectively the closed weld of at least one filler pass and final pass formation.
Further, the ratio of the V-butt section degree of depth of described X-type bevel for welding outer surface one side and the reverse V-butt section degree of depth of inner surface one side is 1:2-2.2.
The utility model has been properly settled the Welding Problems of tank shell in medium wall thickness LNG with practicable process structure, compared with prior art, have following features:
1, welding quality is higher.After backing welding, carry out two-sided filling weldering, can guarantee that 20mm left and right medium wall thickness formation weld strength is high, the high-quality welding of good sealing effect.
2, speed of welding is fast.General T IG welding penetration is shallow, speed is slow, be generally used in the welding of backing welding or thin-walled (δ < 5mm) material, and dynamic semi-automatic TIG weldering speed is its 2～3 times, in the welding of heavy wall material, has more superiority.
3, save welding material.Normal welding groove angle is 55 °-65 °, and groove angle under dynamic agitation condition only needs 45 °-50 °, and welding wire consumption used is few.
4, Site Welding flexible operation.General T IG weldering needs manual wire feed, need two manual works, and dynamic semi-automatic TIG weldering automatic feeding is realized one-handed performance in operation, and Site Welding is more convenient.
Accompanying drawing explanation
Fig. 1 is the bevel for welding structural representation of an embodiment of the utility model.
Fig. 2 is the welding process schematic diagram of Fig. 1 embodiment bevel for welding.
The specific embodiment
Embodiment mono-
In the LNG of the present embodiment, the dynamic semiautomatic welding connecting structure of tank shell, as shown in Fig. 1 and Tu, comprises the adjacent wallboard that forms tank shell butt welding place X-type bevel for welding in LNG, and the minimum clearance of X-type bevel for welding is 2-4mm; Groove angle is 45 °-55 °.The minimum clearance place of X-type bevel for welding is backing run 1, and backing run both sides are respectively the closed weld that one filler pass 2,4 and final pass 3,5 form.The V-butt section degree of depth of X-type bevel for welding outer surface one side is 1:2-2.2 with the ratio of the reverse V-butt section degree of depth of inner surface one side.
Its welding concrete steps are as follows:
The first step, make tank shell butt welding place in LNG form X-type bevel for welding (referring to Fig. 1), minimum clearance is the 2-4mm gap of 1mm depth bounds, groove angle is 50 °, the V-butt section degree of depth of outer surface one side is less than the reverse V-butt section degree of depth of inner surface one side, ratio between two is 1:2-2.2, contributes to like this to reduce welding deformation, guarantees weld strength.
Second step, employing have the semi-automatic inert gas tungsten electrode protection of WIG 500iDC type (outsourcing) weldering (TIC weldering) equipment that welding wire is given function automatically, prepare Ф 1.0mm solid core welding wire, and welding wire preheat curent is 60～70A.
The 3rd step, in LNG, backing welding (referring to Fig. 2) is carried out in the minimum interval of tank shell joint, and bottoming welding electric current I=130～140A, voltage U=10～12V, welding speed V=4～5cm/min, form backing weld seam 1.
The 4th step, in LNG, tank shell inner surface carries out carrying out cosmetic welding 3 after one filling weldering 2 on backing weld seam basis again, fill welding current I=160～170A, voltage U=10～12V, welding speed V=5～6cm/min, cover welding electric current I=170～180A, voltage U=10～12V, welding speed V=5～6cm/min, form inner surfaces enclose weld seam.
The 5th step, in LNG, tank shell outer surface carries out carrying out cosmetic welding 5 after one filling weldering 4 on backing weld seam basis again, fill welding current I=160～170A, voltage U=10～12V, welding speed V=5～6cm/min, cover welding electric current I=170～180A, voltage U=10～12V, welding speed V=5～6cm/min, form outer surface closed weld.
Protective gas in the present embodiment is one of following gas: the mist of argon gas, argon gas and other gases.In welding process, welding wire is sent to mode of vibration, and FREQUENCY CONTROL is at 230 ± 10Hz, and amplitude is controlled at 2 ± 1mm.
Facts have proved, adopt the Welding Structure of the present embodiment, by welding pool dynamic agitation and welding wire are preheated, make welding quality higher, speed of welding is faster.
Claims (3)
- The dynamic semiautomatic welding connecting structure of tank shell in 1.LNG, is characterized in that: comprise the adjacent wallboard that forms tank shell butt welding place X-type bevel for welding in LNG, the minimum clearance of described X-type bevel for welding is 2-4mm; Groove angle is 45 °-55 °.
- 2. the dynamic semiautomatic welding connecting structure of tank shell in LNG according to claim 1, it is characterized in that: the minimum clearance place of described X-type bevel for welding is backing run, described backing run both sides are respectively the closed weld of at least one filler pass and final pass formation.
- 3. the dynamic semiautomatic welding connecting structure of tank shell in LNG according to claim 2, is characterized in that: the V-butt section degree of depth of described X-type bevel for welding outer surface one side is 1:2-2.2 with the ratio of the reverse V-butt section degree of depth of inner surface one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320429240.4U CN203401224U (en) | 2013-07-18 | 2013-07-18 | LNG inner tank wallboard dynamic semi-automatic welding structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320429240.4U CN203401224U (en) | 2013-07-18 | 2013-07-18 | LNG inner tank wallboard dynamic semi-automatic welding structure |
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| Publication Number | Publication Date |
|---|---|
| CN203401224U true CN203401224U (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320429240.4U Expired - Fee Related CN203401224U (en) | 2013-07-18 | 2013-07-18 | LNG inner tank wallboard dynamic semi-automatic welding structure |
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| Country | Link |
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| CN (1) | CN203401224U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105312741A (en) * | 2015-11-30 | 2016-02-10 | 哈尔滨理工大学 | TIP TIG welding method of LNG storage tanks |
| CN115302055A (en) * | 2022-09-13 | 2022-11-08 | 特变电工新疆新能源股份有限公司 | Preheating-free welding method for main body structure of high-strength steel wind power tower cylinder |
-
2013
- 2013-07-18 CN CN201320429240.4U patent/CN203401224U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105312741A (en) * | 2015-11-30 | 2016-02-10 | 哈尔滨理工大学 | TIP TIG welding method of LNG storage tanks |
| CN115302055A (en) * | 2022-09-13 | 2022-11-08 | 特变电工新疆新能源股份有限公司 | Preheating-free welding method for main body structure of high-strength steel wind power tower cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140122 |
|
| CX01 | Expiry of patent term | ||
| CU01 | Correction of utility model |
Correction item: Termination upon expiration of patent Correct: Revocation of Patent Expiration and Termination False: Expiration and Termination of 39 Volume 3102 Patent on August 4, 2023 Number: 31-02 Volume: 39 |
|
| CU01 | Correction of utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 |