CN107584193A - A kind of improved pressure vessel slab welding process - Google Patents
A kind of improved pressure vessel slab welding process Download PDFInfo
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- CN107584193A CN107584193A CN201711023629.8A CN201711023629A CN107584193A CN 107584193 A CN107584193 A CN 107584193A CN 201711023629 A CN201711023629 A CN 201711023629A CN 107584193 A CN107584193 A CN 107584193A
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- welding
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- pressure vessel
- improved pressure
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Abstract
The invention discloses a kind of improved pressure vessel slab welding process, including slab, groove is offered on slab, improved welding procedure includes：Carbon arc air gouging process is exempted using manual argon arc welding bottoming；The upper part of groove is arranged to U-shaped, and the angle on the groove inclined-plane of U-shaped is 20 °, and the lower part of groove sets forming V-shape, and the angle on the inclined-plane of the groove of V-arrangement is 60 °；Welded using stainless steel self-protection flux-cored wire TGF308L；When prime coat welds, welder's welding on the inside of cylinder, another one welder is synchronously protected with argon gas.The improved pressure vessel slab welding process of the present invention, by the improvement of technique, not only ensure that weldquality and performance, reduces the workload of production, in turn ensure that the qualification rate of weld seam.Finally, production joint RT detections all meet the standard I levels of NB/T47013.2 2015, fully meet design requirement.
Description
Technical field
The present invention relates to welding field, specially a kind of improved pressure vessel slab welding process.
Background technology
The factors such as welding procedure and welding method are relevant, need to be welded according to the material of welded piece, the trade mark, chemical composition during operation
Part structure type, welding performance are required to determine；The thickness of slab that material is 022Cr17Ni12Mo2 and thickness is 45mm is welded, if
According to common process, this process of carbon arc air gouging back chipping can be used in such THICK PLATE PRESSURE VESSEL WITH production process.Carbon arc air gouging meeting
Cause weld seam carburizing, with the increase of phosphorus content, austenite is changed into the amount increase of martensite in weld seam, reduces weld seam
Energy.
The content of the invention
It is an object of the invention to provide a kind of improved pressure vessel slab welding process, has and ensure that weldquality
And performance, reduce production work amount the advantages of, to solve the problems mentioned in the above background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of improved pressure vessel slab welding process, including slab, groove, improved welding procedure bag are offered on slab
Include as follows：
The improvement of the first step, welding method, carbon arc air gouging process is exempted using manual argon arc welding bottoming；
The improvement of second step, groove type, the upper part of groove are arranged to U-shaped, and the angle on the groove inclined-plane of U-shaped is 20 °, groove
Lower part set forming V-shape, the angle on the inclined-plane of the groove of V-arrangement is 60 °；
The improvement of 3rd step, wlding, welded using stainless steel self-protection flux-cored wire TGF308L；
The determination of 4th step, welding procedure, when prime coat welds, welder's welding on the inside of cylinder, another one welder synchronization
Protected with argon gas.
Preferably, the groove side elder generation welding of V-arrangement, when the groove side of U-shaped is welded, the back side carries out pressure fixation.
Preferably, the deposited metal thickness of argon arc welding is not less than 6-10mm.
Preferably, UT detections are carried out after every layer of weld seam welding of product.
Compared with prior art, the beneficial effects of the invention are as follows：The improved pressure vessel slab welding process of the present invention,
By the improvement of technique, weldquality and performance are not only ensure that, reduces the workload of production, in turn ensure that the qualified of weld seam
Rate.Finally, production joint RT detections all meet NB/T47013.2-2015 standard I levels, fully meet design requirement.
Brief description of the drawings
Fig. 1 is the groove cross-sectional view of the present invention；
Fig. 2 is the welding procedure welding parameter table figure of the present invention；
Fig. 3 is traditional groove cross-sectional view；
Fig. 4 is traditional welding procedure welding parameter table figure.
In figure：1 slab, 2 grooves.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, close Chu, complete is carried out to the technical scheme in the embodiment of the present invention
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Refering to Fig. 1-4, the present invention provides a kind of technical scheme：A kind of improved pressure vessel slab welding process, including
Slab 1, groove 2 is offered on slab 1, and improved welding procedure includes as follows：
The improvement of the first step, welding method, using manual argon arc welding bottoming, to ensure the quality of prime coat weld seam, eliminate
Carbon arc air gouging process；
The improvement of second step, the form of groove 2, the upper part of groove 2 are arranged to U-shaped, and the angle on the inclined-plane of groove 2 of U-shaped is 20 °,
The lower part of groove 2 sets forming V-shape, and the angle on the inclined-plane of the groove 2 of V-arrangement is 60 °, 2 side elder generations of the groove welding of V-arrangement, the slope of U-shaped
When 2 sides of mouth are welded, the back side carries out pressure fixation；
The improvement of 3rd step, wlding, welded using stainless steel self-protection flux-cored wire TGF308L, stainless flux-cored wire
It is the novel welding material just developed in recent years, this welding procedure has the effect of slag gas Combined Protection, after being melted using medicine core
The slag of formation is protected to back of weld, it is ensured that the air insulated of weld metal and surrounding, weld metal when avoiding high temperature
Oxidation.Therefore, during stainless flux-cored wire bottom argon arc welding, it is not necessary to which using the technological measure of back side argon filling, and weld seam is carried on the back
Face welding slag covering is preferable, and de- slag is easy, and appearance of weld is attractive in appearance；
The determination of 4th step, welding procedure, when prime coat welds, welder's welding on the inside of cylinder, another one welder synchronization
Protected with argon gas, the deposited metal thickness of argon arc welding is not less than 6-10mm, and UT detections are carried out after every layer of weld seam welding of product.
This process of carbon arc air gouging back chipping can be used in THICK PLATE PRESSURE VESSEL WITH production process.Carbon arc air gouging can cause weld seam to ooze
Carbon, with the increase of phosphorus content, austenite is changed into the amount increase of martensite in weld seam, reduces Weld Performance, is directed to this
The modified technique of the present invention is proposed, the comparison of prior art and the present invention is described in detail below：
（1）The comparison of welding method, if using Lincoln weld or SMAW bottoming, both welding methods will accomplish
One side welding with back formation has relative difficulty, if the cob webbing of sealing run or generating defect, it is rear weld side weld welding before
Must back chipping.This product clear stipulaties do not allow using this process of carbon arc air gouging, and abrasive machine polishing is unique method, but
The defects of removing back of weld using abrasive machine polishing, workload is very big, can have a strong impact on the production cycle, therefore determines to use hand
Work bottom argon arc welding, to ensure the quality of prime coat weld seam, eliminate carbon arc air gouging this process；
（2）The comparison of groove type, original groove 2 are X-type, and the angle on upper and lower groove part point inclined-plane is 55 °, because thickness of slab
Using X-type slope groove（DU35）, the inner side Lincoln weld welding of groove 2, reverse side carbon arc air gouging back chipping, abrasive machine, which is polished, sees metal
Gloss, then welded using Lincoln weld, the deposited metal of weld seam is relatively more, and this just increases the workload of welding.To protect
The quality of sealing run when demonstrate,proving bottom argon arc welding, reduces the deposited metal loading of weld seam, and welding groove have also been made adjustment, groove
2 upper part is arranged to U-shaped, and the angle on the inclined-plane of groove 2 of U-shaped is 20 °, and the lower part of groove 2 sets forming V-shape, the groove of V-arrangement
The angle on 2 inclined-plane is 60 °, 2 side elder generations of the groove welding of V-arrangement, and when the side of groove 2 of U-shaped is welded, the back side force admittedly
It is fixed；
（3）The comparison of wlding, in welding process, Cr mobility acutely increases stainless steel, if weld seam molten bath is not protected effectively
Protect, with oxygen vigorous reaction occurs for the alloying elements cr in weld seam, can cause weld seam severe oxidation.During manual argon arc welding bottoming, if
Back of weld is not protected effectively, the root of weld can severe oxidation, alloying element can serious scaling loss, so the back side must lead to argon
Gas shielded.Need to splice because product diameter is larger, before shell rolling, the long 2000mm of the longitudinal joint, use the back side during bottom argon arc welding
With frock gas-filled protective poor effect, welding point is easy to aoxidize, and the weld seam of oxidation must be removed before sealing run welding, this
One process considerably increases workload, extends the production cycle.By test of many times, using stainless steel self-protection flux-cored wire
TGF308L.Stainless flux-cored wire is the novel welding material just developed in recent years, and there is this welding procedure slag gas joint to protect
Shield is acted on, and the slag formed after being melted using medicine core protected to back of weld, it is ensured that weld metal and the air of surrounding every
From the oxidation of weld metal when avoiding high temperature.Therefore, during stainless flux-cored wire bottom argon arc welding, it is not necessary to using back side argon filling
Technological measure, and the covering of back of weld welding slag is preferable, takes off that slag is easy, and appearance of weld is attractive in appearance；
（4）The comparison of welding procedure, such as Fig. 3 and Fig. 4, welding method is GTAW when traditional welding bead/layer is 1（Prosposition）, fill out
It is FFW-316 to fill material trademark, and welding method is GTAW when welding bead/layer is 2-3（Prosposition）, the packing material trade mark is
H03Cr19Ni12Mo2, welding bead/layer after improvement only has 1-3, and welding method is GTAW during 1-3（Transverse presentation）, packing material
The trade mark is H03Cr19Ni12Mo2.
The key points for operation of the present invention：
（1）To reduce welding deformation amount, the welding of V-butt side elder generation, when U-shaped groove side is welded, the back side carries out pressure fixation；
（2）Not burn-through during to ensure submerged arc welding, it is necessary to assure deposited metal thickness >=6-10mm of argon arc welding；
（3）Welding process inevitably produces weld defect, and removal of defect can only use abrasive machine to polish.If weld seam
One-shot forming, this can bring very big difficulty to removal of defect, so carrying out UT detections after the every layer of weld seam welding of this product, to the greatest extent
It is early to find defect, so as to Weld Seam Repairation.
In summary：The improved pressure vessel slab welding process of the present invention, by the improvement of technique, not only ensure that
Weldquality and performance, the workload of production is reduced, in turn ensure that the qualification rate of weld seam.Finally, production joint RT is detected
Meet NB/T47013.2-2015 standard I levels, fully meet design requirement.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (4)
1. a kind of improved pressure vessel slab welding process, it is characterised in that including slab（1）, slab（1）On offer slope
Mouthful（2）, improved welding procedure includes as follows：
The improvement of the first step, welding method, carbon arc air gouging process is exempted using manual argon arc welding bottoming；
Second step, groove（2）The improvement of form, groove（2）Upper part be arranged to U-shaped, the groove of U-shaped（2）The angle on inclined-plane
For 20 °, groove（2）Lower part set forming V-shape, the groove of V-arrangement（2）The angle on inclined-plane be 60 °；
The improvement of 3rd step, wlding, welded using stainless steel self-protection flux-cored wire TGF308L；
The determination of 4th step, welding procedure, when prime coat welds, welder's welding on the inside of cylinder, another one welder synchronization
Protected with argon gas.
A kind of 2. improved pressure vessel slab welding process according to claim 1, it is characterised in that the groove of V-arrangement
（2）The welding of side elder generation, the groove of U-shaped（2）When side is welded, the back side carries out pressure fixation.
3. a kind of improved pressure vessel slab welding process according to claim 1, it is characterised in that argon arc welding is melted
Metallisation thickness is not less than 6-10mm.
A kind of 4. improved pressure vessel slab welding process according to claim 1, it is characterised in that every layer of weldering of product
UT detections are carried out after seam welding.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710475548 | 2017-06-21 | ||
| CN2017104755485 | 2017-06-21 |
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| CN107584193A true CN107584193A (en) | 2018-01-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114273759A (en) * | 2021-12-30 | 2022-04-05 | 东方电气（武汉）核设备有限公司 | Welding method of reactor core shroud assembly |
| CN116900537A (en) * | 2023-09-13 | 2023-10-20 | 哈尔滨电机厂有限责任公司 | Method for manufacturing small-opening water pump turbine runner split-fan cast-weld |
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| US4320277A (en) * | 1979-02-23 | 1982-03-16 | Nippon Kokan Kabushiki Kaisha | Thick welded steel pipe of large diameter and production thereof |
| CN102363238A (en) * | 2011-08-15 | 2012-02-29 | 南京钢铁股份有限公司 | Thick plate submerged arc welding technology for low-temperature maritime engineering |
| CN103658926A (en) * | 2013-11-25 | 2014-03-26 | 唐山轨道客车有限责任公司 | Pipe-pipe butt joint system and construction method of pipe-pipe butt joint system |
| CN105234535A (en) * | 2015-11-11 | 2016-01-13 | 上海振华重工(集团)股份有限公司 | Welding technology for barrel |
| CN105479187A (en) * | 2016-01-22 | 2016-04-13 | 中建钢构天津有限公司 | Welding method of medium-thickness groove |
| CN105583503A (en) * | 2014-10-23 | 2016-05-18 | 邵杰 | Carbon steel tube welding process |
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2017
- 2017-10-27 CN CN201711023629.8A patent/CN107584193A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4320277A (en) * | 1979-02-23 | 1982-03-16 | Nippon Kokan Kabushiki Kaisha | Thick welded steel pipe of large diameter and production thereof |
| CN102363238A (en) * | 2011-08-15 | 2012-02-29 | 南京钢铁股份有限公司 | Thick plate submerged arc welding technology for low-temperature maritime engineering |
| CN103658926A (en) * | 2013-11-25 | 2014-03-26 | 唐山轨道客车有限责任公司 | Pipe-pipe butt joint system and construction method of pipe-pipe butt joint system |
| CN105583503A (en) * | 2014-10-23 | 2016-05-18 | 邵杰 | Carbon steel tube welding process |
| CN105234535A (en) * | 2015-11-11 | 2016-01-13 | 上海振华重工(集团)股份有限公司 | Welding technology for barrel |
| CN105479187A (en) * | 2016-01-22 | 2016-04-13 | 中建钢构天津有限公司 | Welding method of medium-thickness groove |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114273759A (en) * | 2021-12-30 | 2022-04-05 | 东方电气（武汉）核设备有限公司 | Welding method of reactor core shroud assembly |
| CN116900537A (en) * | 2023-09-13 | 2023-10-20 | 哈尔滨电机厂有限责任公司 | Method for manufacturing small-opening water pump turbine runner split-fan cast-weld |
| CN116900537B (en) * | 2023-09-13 | 2024-03-19 | 哈尔滨电机厂有限责任公司 | Method for manufacturing small-opening water pump turbine runner split-fan cast-weld |
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Application publication date: 20180116 |