CN109807516A - A kind of continuous welded pipe line back protection device of multistage - Google Patents
A kind of continuous welded pipe line back protection device of multistage Download PDFInfo
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- CN109807516A CN109807516A CN201910190059.4A CN201910190059A CN109807516A CN 109807516 A CN109807516 A CN 109807516A CN 201910190059 A CN201910190059 A CN 201910190059A CN 109807516 A CN109807516 A CN 109807516A
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- lantern ring
- air bag
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Abstract
The invention discloses a kind of continuous welded pipe line back protection devices of multistage, are related to pipeline welding technology field, and the continuous welded pipe line back protection device of pipelines specification, multistage easy to operate can be adapted to by providing one kind.The spiral pipe outer wall is provided with external screw thread, the barrier assembly is set as at least two, the barrier assembly includes the first lantern ring and the second lantern ring to match with inner wall of the pipe, first lantern ring and the second lantern ring are connected on helix tube by sets of holes spiral, it is provided with circumferential groove on first lantern ring and the second lantern ring, blocking air bag is provided in the circumferential groove；Stop air bag itself that there is elasticity; the amplitude to swell can be adjusted according to the internal diameter of the pipeline of different size; to be adapted to the welding back-protective of pipelines specification; multiple weld bond positions of one segment pipe can continuously be welded by being threadedly coupled multiple barrier assemblies on the coil; it is simple to operate, significantly reduce labor intensity.
Description
Technical field
The present invention relates to pipeline welding technology fields, and in particular to the continuous welded pipe line back protection device of multistage.
Background technique
When pipeline welds in addition to the positive high temperature molten bath of weld seam needs suitable protecting, the back side of weld seam must also take must
Measure is wanted to obstruct the oxygen in air to the oxidation of weld seam.If not taking weld seam protection measure, the weld metal at the back side
Be easy to aoxidize in the welding process, alloying element scaling loss, and be also easy to produce welding defect, cause weld metal mechanical property and
Corrosion resistance decline.Usual inert gas is considered as preferable protection medium, can be used to implement the dress of back of weld gas shield
It sets and " back protection device " is known as by industry.In existing pipeline welding process, whole argon filling method is generallyd use, by pipe ends
It seals, is filled with inert gas and is protected, reduce oxygen content inside pipeline, to reduce degree of oxidation.For minor diameter pipe
When road or pipe fitting group shorter to pipeline, whole argon filling can be used, this method is fairly simple.But for large-diameter pipeline or pipe fitting group
When longer to pipeline, using whole argon filling, the defect so done is that the consumption of inert gas is big, leads to high production cost；It fills
The gas time is long, causes production efficiency low；And since inside pipeline or air drain space is big, even if being filled with a large amount of inert gases,
Still cannot effective evacuation of air, protecting effect is very poor, seriously affects welding quality, causes postwelding need to be to weld seam sanding and polishing or acid
Passivation is washed, a large amount of manpower and material resources are wasted.
Patent CN201620972770.7 discloses a kind of stainless steel pipeline welding back protection device, it includes blocking portion
Part and gas tube, stop member and stainless steel tube form an accommodating cavity, and stop member is connect with gas tube, convenient for accommodating cavity
Interior inflation, weldquality are effectively guaranteed, and dramatically save argon gas usage amount, are formed between the device and stainless steel
Accommodating cavity, which is bonded by front end baffle and rear end-stopping plate with tube wall, to be formed closed, and front end baffle and rear end-stopping plate are using fluorubber system
It is made of according to corresponding internal diameter of the pipeline at, the size of fluorubber, therefore the specific fluorubber size of the device can only fit
A kind of back-protective with internal diameter of the pipeline needs replacing different baffles if needing the pipeline for different size to improve back-protective
The protective device of size needs to prepare in advance the various sizes of back protection device of different size, substantially increase manufacture at
This, causes its applicability bad, further, since fluorubber needs to form sealing state, during the production and processing, fluorubber with tube wall
Outer diameter would generally be slightly larger than pipe wall internal diameters, therefore, when back protection device install in pipeline need exert oneself dragging could reach
To weld bond position, if the dimensioned error of fluorubber is crossed stucking phenomena may well occurs in pipeline.
In addition, existing back protection device is typically only capable to protect a weld bond position, if a segment pipe is deposited
In multiple weld bond positions, one of weld bond position gas-filled protective can only be welded and finish and then re-move back-protective
Device is inflated welding to next weld bond position again, carries out repeatedly, not only cumbersome, but also greatly increases
Labor intensity.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can be adapted to pipelines specification, multistage easy to operate
Continuous welded pipe line back protection device.
The technical solution adopted by the present invention to solve the technical problems is: a kind of continuous welded pipe line back-protective dress of multistage
It sets, including barrier assembly and helix tube, the spiral pipe outer wall is provided with external screw thread, and the barrier assembly is set as at least two
A, the barrier assembly includes the first lantern ring and the second lantern ring to match with inner wall of the pipe, first lantern ring and second
Lantern ring is connected on helix tube by sets of holes spiral, is provided with circumferential groove on first lantern ring and the second lantern ring, described
Blocking air bag is provided in circumferential groove；
First lantern ring and the second lantern ring are respectively arranged at the two sides of pipe welding port position, first lantern ring and the second lantern ring
Between form the accommodating chamber for filling argon gas, the structure of the first lantern ring and the second lantern ring is identical, equipped with axially through lantern ring
Axial flow channel and the radial air flow channel being arranged radially, radial air flow channel crosses with axial flow channel to be connected to；Air-flow
Channel with the air-flow seal of tube for being connected to；Several isocons are evenly distributed on radial air flow pipe, isocon and axial flow are logical
The axis in road is that the center of circle is radially distributed；；Pass through air-flow between axial flow channel between first lantern ring and the second lantern ring
Seal of tube connection, the axial flow channel of the lantern ring of two neighboring barrier assembly is also connected to by the air-flow seal of tube；
Several interlayers are provided in the blocking air bag, the interlayer will stop air bag to be along the circumferential direction separated into several interlayer lists
Member, the quantity of interlayer unit and the quantity of isocon are corresponding；It is all provided on the corresponding blocking air bag internal ring wall of each interlayer unit
Communication port, for being connected to the shunting seal of tube；Interlayer is multi-stage expansion plate, outermost laminate and the blocking air bag of multi-stage expansion plate
Internal ring wall is fixedly connected, and the innermost layer plate of multi-stage expansion plate is fixedly connected with the external annulus of air bag is stopped；Several isocon difference
Connection stops each interlayer unit of air bag, and air bag is stopped to be equipped with exhaust pipe.
It is described to stop to be provided with the insulating rubber for completely cutting off inner wall of the pipe on air bag as a kind of optimal technical scheme
Pad.
As a kind of optimal technical scheme, described helix tube one end is provided with the limitation for abutting against with pipeline oral area
Bar.
As a kind of optimal technical scheme, the quantity of the interlayer unit is 14~20.
As a kind of optimal technical scheme, the diameter of the isocon is greater than the diameter of exhaust pipe.
The beneficial effects of the present invention are: the continuous welded pipe line back protection device of the multistage of the application, stops air bag itself
With elasticity, the amplitude to swell can be adjusted according to the internal diameter of the pipeline of different size, to be adapted to the welding of pipelines specification
Back-protective.The setting of check valve can still guarantee that blocking air bag continues to use once one of interlayer unit is damaged,
The reliability that the back gas shielded device uses is greatly strengthened, in addition, by being threadedly coupled multiple barrier assemblies on the coil
Multiple weld bond positions of one segment pipe can continuously be welded, without re-starting the mobile adjustment of device, side easy to operate
Just, labor intensity is significantly reduced.
Detailed description of the invention
The a part of attached drawing as the application, for providing further understanding of the invention, of the invention is schematic
Examples and descriptions thereof are used to explain the present invention, but does not constitute an undue limitation on the present invention.Obviously, the accompanying drawings in the following description
Only some embodiments to those skilled in the art without creative efforts, can be with
Other accompanying drawings can also be obtained according to these attached drawings.In the accompanying drawings:
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the axial sectional view of the first lantern ring；
Fig. 3 is the radial cross-section of the first lantern ring；
Fig. 4 is the effect picture for stopping the interlayer elongation of air bag.
It is as shown in the figure: helix tube 1；First lantern ring 2；Second lantern ring 3；Circumferential groove 4；Stop air bag 5；Accommodating chamber 6；Air-flow
Pipe 7；Isocon 8；Axial flow channel 9；Radial air flow channel 10；Pipe welding port position 11；Interlayer 12；Exhaust pipe 13；Limitation
Bar 14；Insulating rubber pad 15.
It should be noted that these attached drawings and verbal description are not intended to the design model limiting the invention in any way
It encloses, but illustrates idea of the invention by referring to specific embodiments for those skilled in the art.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in embodiment is clearly and completely described, the following examples are intended to illustrate the invention, but
It is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Present invention will be further explained below with reference to the attached drawings and examples.
A kind of continuous welded pipe line back protection device of multistage includes barrier assembly and helix tube, and the spiral pipe outer wall is set
It is equipped with external screw thread, the barrier assembly is set as at least two, can by being threadedly coupled multiple barrier assemblies on the coil
Multiple weld bond positions of one segment pipe are continuously welded, without re-starting the mobile adjustment of device, simple to operate, pole
The earth reduces labor intensity, and the barrier assembly includes the first lantern ring to match with inner wall of the pipe, the second lantern ring, and described the
It is provided with sets of holes on one lantern ring and the second lantern ring, the internal screw thread to match with helix tube external screw thread, institute are provided in the sets of holes
It states the first lantern ring and the second lantern ring is connected on helix tube by sets of holes spiral, be connected through a screw thread, it can be according to different location
The position where barrier assembly is quickly and easily adjusted without the pipe welding port position of quantity, is threaded on helix tube multiple
Barrier assembly can continuously weld multiple weld bond positions of a segment pipe, without re-starting the mobile adjustment of device.Institute
It states and is provided with circumferential groove on the first lantern ring and the second lantern ring, the blocking air bag of annular, ring are provided in the circumferential groove
To groove position restriction effect can be played to blocking air bag.
As shown in Fig. 1 ~ Fig. 4, a kind of continuous welded pipe line back protection device of multistage of the invention, including barrier assembly and
Helix tube 1,1 outer wall of helix tube are provided with external screw thread, and the barrier assembly is set as at least two, by helix tube 1
The upper multiple barrier assemblies of threaded connection can continuously weld multiple weld bond positions of a segment pipe, without re-starting dress
Mobile adjustment is set, it is simple to operate, labor intensity is significantly reduced, the barrier assembly includes matching with inner wall of the pipe
The first lantern ring 2, the second lantern ring 3, be provided with sets of holes on first lantern ring 2 and the second lantern ring 3, be provided in the sets of holes with
The internal screw thread that 1 external screw thread of helix tube matches, first lantern ring 2 and the second lantern ring 3 are connected to helix tube 1 by sets of holes spiral
On, it is connected through a screw thread, can quickly and easily adjust blocking group according to the pipe welding port position 11 that different location does not have to quantity
Position where part, can be to multiple weld bond positions of a segment pipe by being threadedly coupled multiple barrier assemblies on helix tube 1
It is continuously welded, without re-starting the mobile adjustment of device.Circumferential direction is provided on first lantern ring 2 and the second lantern ring 3
Groove 4, is provided with cricoid blocking air bag 5 in the circumferential groove 4, and circumferential groove 4 can be to stopping air bag 5 play position limit
Production is used.
First lantern ring 2 and the second lantern ring 3 are respectively arranged at the two sides of pipe welding port position 11, first lantern ring 2
And second form the accommodating chamber 6 for filling argon gas between lantern ring 3, the first lantern ring 2 is identical with the structure of the second lantern ring 3, such as Fig. 1
Shown, lantern ring is equipped with the axial flow channel 9 axially through lantern ring, as shown in Fig. 2, being additionally provided with the diameter being arranged radially on lantern ring
To airflow channel 10, radial air flow channel 10 crosses with axial flow channel 9 is connected to the upper airflow channel that lantern ring is collectively formed.
Specifically, airflow channel is used to be connected to the sealing of gas flow tube 7, so that the argon gas that gas flow tube 7 flows into enters on lantern ring
Axial flow channel 9, then and enter the radial air flow channel 10 on lantern ring, and the radial gas on the first lantern ring 2 and the second lantern ring 3
Circulation road 10 is all connected to air bag 5 is stopped, so that argon gas enters in lantern ring.Further, the first lantern ring 2 and the second lantern ring
Pass through the sealing connection of gas flow tube 7, the axial flow of the lantern ring of two neighboring barrier assembly between axial flow channel 9 between 3
Channel 9 is also sealed by gas flow tube 7 and is connected to；It is worth illustrating, gas flow tube 7 is necessary for hose or has the elasticity of retractility
Pipe, this is because to meet barrier assembly screw displacement on helix tube 1.(in order to draw conveniently in Fig. 1,7 length of gas flow tube is seen
Getting up between the first lantern ring 2 and the second lantern ring 3, adjacent barrier assembly is exact matching, in fact, the length of gas flow tube 7
Should be long, to meet the needs of distance adjustment.)
It is evenly distributed with several isocons 8 on above-mentioned radial air flow pipe 7, the axis in isocon 8 and axial flow channel 9 is the center of circle
Radially it is distributed.Isocon 8 is connected to the sealing of air bag 5 is stopped.
The heat for stopping gas receiving closer from weld bond position is more, is easy to appear high temperature burnout phenomenon, more in order to prolong
In the long service life for stopping air bag 5 to use, prevent high temperature from damaging, it is described stop to be provided on air bag 5 for completely cut off inner wall of the pipe every
Hot rubber pad 15.The insulating rubber pad 15 uses fluorubber, and fluorubber refers to former containing fluorine on the carbon atom of main chain or side chain
The synthesis macromolecular elastomer of son.The introducing of fluorine atom assigns the excellent heat resistance of rubber, inoxidizability, oil resistivity, corrosion-resistant
Property and resistance to weathering, are widely applied in fields such as space flight, aviation, automobile, petroleum and household electrical appliance.
Several interlayers 12 are provided in the blocking air bag 5, the interlayer 12 will stop air bag 5 to be along the circumferential direction separated into
Several interlayer units, specifically, the quantity of interlayer unit are corresponding with the quantity of isocon 8.The corresponding resistance of each interlayer unit
It is all provided with communication port on gear 5 internal ring wall of air bag, for being connected to the sealing of above-mentioned isocon 8, air bag is divided into several only by interlayer 12
Vertical interlayer unit, so that breakage occurs in any one interlayer unit, and other interlayer units are kept intact, to reduce argon
Gas leakage, strengthens the reliability for stopping air bag 5.
It is worth special instruction, as shown in Fig. 3 ~ 4, above-mentioned interlayer 12 is multi-stage expansion plate, the outermost layer of multi-stage expansion plate
Plate is fixedly connected with the internal ring wall of air bag 5 is stopped, the fixed company of external annulus of the innermost layer plate and blocking air bag 5 of multi-stage expansion plate
It connects.
Several isocons 8 are respectively communicated on the blocking each interlayer unit of air bag 5, each interlayer unit for stopping air bag 5
All it is equipped with exhaust pipe 13.In the present embodiment, prevent from stopping the unexpected breakage of air bag 5 to lead to realize to stopping the design of air bag 5 to be
Argon gas leakage is caused, guarantees the effect of gas-filled protective as far as possible.
Specifically, work as certain, it is assumed that if A interlayer unit is damaged in Fig. 3,4, other interlayer units still maintain former
Shape keeps sealing effect.Therefore, most important is that Diaphragming air bag is 12 structure of interlayer and interlayer 12 is multi-stage expansion plate.By
In this structure, when non-aerating, air bag 5 is stopped not heaved, then air bag external annulus will not apply a force to multi-stage expansion plate most
Inner plating, therefore, entire balloon contraction state, size is smaller, it may be convenient to pass in and out in pipeline.When being inflated, by
Start to expand in air bag external annulus, just apply a force to the innermost layer plate of multi-stage expansion plate, therefore, multi-stage expansion plate follows air bag swollen
Swollen size automatically adjusts fit size, until tight against inner wall of the pipe.And even if A interlayer unit is damaged, but its adjacent two
A interlayer unit still maintains inflated condition, and the interlayer 12(multi-stage expansion plate of A interlayer unit two sides) be also belong to it is adjacent every
Layer unit, therefore, the inflated condition of adjacent spacers unit makes the expansion plate of A interlayer unit two sides still maintain length,
So that A interlayer unit will not be deflated, even if still maintaining the support to insulating rubber pad 15 to guarantee A interlayer unit gas leakage,
So that it still is able to be sealed, reducing argon gas leakage may.
And due to the special construction for stopping air bag 5, even if air bag has, many places are damaged, as long as breakage is that interval is damaged, that
It can still carry out using being inflated protection, the increased durability for stopping air bag 5 to use.
Its course of work is as follows, and protective device is put into pipeline, where so that pipe welding port position 11 is located at accommodating chamber 6
Region is passed through argon gas from gas flow tube 7, and gas passes sequentially through airflow channel, isocon 8 on lantern ring and enters corresponding blocking gas
In the interlayer unit of capsule 5, during each interlayer unit flows into argon gas, the argon gas of each interlayer unit also gradually passes through exhaust
Pipe 13 is discharged into accommodating chamber 6, and the oxygen in accommodating chamber 6 is discharged from pipe welding port, stops air bag 5 gradually to swell tight with tube wall
Closely connected conjunction, meanwhile, the space of accommodating chamber 6 can be gradually filled with argon gas, drastically reduce 6 oxygen content of accommodating chamber；Pipe welding port position
The blocking air bag 5 at 11 both ends is adjacent to form a closed accommodating chamber 6, to reduce degree of oxidation, weldquality is obtained
To being effectively ensured, duration of ventilation is short, and welder's waiting time is short, dramatically saves argon gas usage amount, especially large diameter pipe
The saving of road welding clearly, stops air bag 5 itself to have elasticity, can be adjusted and be swollen according to the internal diameter of the pipeline of different size
Amplitude, to be adapted to the welding back-protective of pipelines specification.The structure of air bag 5 is stopped to make, so that once wherein one
A interlayer unit is damaged, can still guarantee that air bag 5 is stopped to continue to use, and greatly strengthen that the back protection device uses can
By property.In addition, can be carried out to multiple weld bond positions of a segment pipe by being threadedly coupled multiple barrier assemblies on helix tube 1
Continuous welding, it is simple to operate without re-starting the mobile adjustment of device, significantly reduce labor intensity.
When implementing back of weld gas shield to pipeline, the pipe welding port position 11 needs to be located at 6 place of accommodating chamber
Region makes it quickly reach pipe welding port position 11,1 open end of helix tube in order to which the position to accommodating chamber 6 carries out positioning
It is provided with the limitation bar 14 for abutting against with pipeline oral area.Measure in advance pipe welding port position 11 to pipeline oral area away from
From, barrier assembly installation when arrived so that position of the accommodating chamber 6 apart from 1 port of helix tube is just adapted to pipe welding port position 11
The distance of pipeline oral area, limitation bar 14 can play restriction effect to the movement of helix tube 1, when limitation bar 14 and pipeline oral area phase
When abutting, pipe welding port position 11 is located just at the region where accommodating chamber 6, can greatly save the adjustment of barrier assembly position
Time improves working efficiency.
The very few protecting effect of the quantity of interlayer unit is unobvious, and quantity excessively increases manufacturing cost, it is preferred that the interlayer
The quantity of unit is 14~20, and the arrangement of interlayer unit is more uniform, good to the sealing effect of device.
Further, the diameter of exhaust pipe 13 is less than the diameter of isocon 8.
The above is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this patent
Member without departing from the scope of the present invention, when the technology contents using above-mentioned prompt make it is a little change or be modified to
The equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, it is right according to the technical essence of the invention
Any simple modification, equivalent change and modification made by above embodiments, in the range of still falling within the present invention program.
Claims (5)
1. a kind of continuous welded pipe line back protection device of multistage, it is characterised in that: including barrier assembly and helix tube, the spiral shell
Coil outer wall is provided with external screw thread, and the barrier assembly is set as at least two, and the barrier assembly includes and inner wall of the pipe phase
Matched first lantern ring and the second lantern ring, first lantern ring and the second lantern ring are connected on helix tube by sets of holes spiral,
It is provided with circumferential groove on first lantern ring and the second lantern ring, blocking air bag is provided in the circumferential groove；
First lantern ring and the second lantern ring are respectively arranged at the two sides of pipe welding port position, first lantern ring and the second lantern ring
Between form the accommodating chamber for filling argon gas, the structure of the first lantern ring and the second lantern ring is identical, equipped with axially through lantern ring
Axial flow channel and the radial air flow channel being arranged radially, radial air flow channel crosses with axial flow channel to be connected to；Air-flow
Channel with the air-flow seal of tube for being connected to；Several isocons are evenly distributed on radial air flow pipe, isocon and axial flow are logical
The axis in road is that the center of circle is radially distributed；；Pass through air-flow between axial flow channel between first lantern ring and the second lantern ring
Seal of tube connection, the axial flow channel of the lantern ring of two neighboring barrier assembly is also connected to by the air-flow seal of tube；
Several interlayers are provided in the blocking air bag, the interlayer will stop air bag to be along the circumferential direction separated into several interlayer lists
Member, the quantity of interlayer unit and the quantity of isocon are corresponding；It is all provided on the corresponding blocking air bag internal ring wall of each interlayer unit
Communication port, for being connected to the shunting seal of tube；Interlayer is multi-stage expansion plate, outermost laminate and the blocking air bag of multi-stage expansion plate
Internal ring wall is fixedly connected, and the innermost layer plate of multi-stage expansion plate is fixedly connected with the external annulus of air bag is stopped；Several isocon difference
Connection stops each interlayer unit of air bag, and air bag is stopped to be equipped with exhaust pipe.
2. the continuous welded pipe line back protection device of multistage as described in claim 1, it is characterised in that: on the blocking air bag
It is provided with the insulating rubber pad (17) for completely cutting off inner wall of the pipe.
3. the continuous welded pipe line back protection device of multistage as described in claim 1, it is characterised in that: described helix tube one end
It is provided with the limitation bar for abutting against with pipeline oral area.
4. the continuous welded pipe line back protection device of multistage as described in claim 1, it is characterised in that: the interlayer unit
Quantity is 14~20.
5. the continuous welded pipe line back protection device of multistage as described in claim 1, it is characterised in that: the isocon it is straight
Diameter is greater than the diameter of exhaust pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910190059.4A CN109807516B (en) | 2019-03-13 | 2019-03-13 | Back protection device for multi-section continuous welding pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910190059.4A CN109807516B (en) | 2019-03-13 | 2019-03-13 | Back protection device for multi-section continuous welding pipeline |
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| Publication Number | Publication Date |
|---|---|
| CN109807516A true CN109807516A (en) | 2019-05-28 |
| CN109807516B CN109807516B (en) | 2020-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910190059.4A Active CN109807516B (en) | 2019-03-13 | 2019-03-13 | Back protection device for multi-section continuous welding pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110355448A (en) * | 2019-07-09 | 2019-10-22 | 福建福清核电有限公司 | Stainless steel or dissimilar steel branch pipe welding back side argon-filled protection device |
| CN110788187A (en) * | 2019-11-29 | 2020-02-14 | 嵊州市鑫林机械有限公司 | Novel flanging machine |
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| EP1060827A1 (en) * | 1999-05-29 | 2000-12-20 | H. Butting GmbH & Co. KG | Method and apparatus for treating the interoir of metallic tubes |
| CN201333599Y (en) * | 2009-01-22 | 2009-10-28 | 中国化学工程第三建设有限公司 | Protective gas sealing device in a pipeline welding pipe |
| CN203171162U (en) * | 2013-04-08 | 2013-09-04 | 大连东方亿鹏设备制造有限公司 | Welding seam back face protection device |
| US20170225258A1 (en) * | 2016-02-05 | 2017-08-10 | Michael Hacikyan | Gas Diffusing Water Degradable Welding Purge Dam |
| CN207840375U (en) * | 2018-01-29 | 2018-09-11 | 昆山华恒焊接股份有限公司 | Pipe fitting welding carries on the back protective device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1060827A1 (en) * | 1999-05-29 | 2000-12-20 | H. Butting GmbH & Co. KG | Method and apparatus for treating the interoir of metallic tubes |
| CN201333599Y (en) * | 2009-01-22 | 2009-10-28 | 中国化学工程第三建设有限公司 | Protective gas sealing device in a pipeline welding pipe |
| CN203171162U (en) * | 2013-04-08 | 2013-09-04 | 大连东方亿鹏设备制造有限公司 | Welding seam back face protection device |
| US20170225258A1 (en) * | 2016-02-05 | 2017-08-10 | Michael Hacikyan | Gas Diffusing Water Degradable Welding Purge Dam |
| CN207840375U (en) * | 2018-01-29 | 2018-09-11 | 昆山华恒焊接股份有限公司 | Pipe fitting welding carries on the back protective device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110355448A (en) * | 2019-07-09 | 2019-10-22 | 福建福清核电有限公司 | Stainless steel or dissimilar steel branch pipe welding back side argon-filled protection device |
| CN110788187A (en) * | 2019-11-29 | 2020-02-14 | 嵊州市鑫林机械有限公司 | Novel flanging machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109807516B (en) | 2020-09-04 |
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