CN207806945U - Girth welding oxygen-proof protecting device - Google Patents
Girth welding oxygen-proof protecting device Download PDFInfo
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- CN207806945U CN207806945U CN201721890204.2U CN201721890204U CN207806945U CN 207806945 U CN207806945 U CN 207806945U CN 201721890204 U CN201721890204 U CN 201721890204U CN 207806945 U CN207806945 U CN 207806945U
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- circulating line
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- protecting device
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Abstract
The utility model discloses a kind of girth welding oxygen-proof protecting devices, including support element, are used to support two side ducts of Sizing In Butt Welded Pipes to be welded；Circulating line, the circulating line of the non-closed loop for being passed through inert gas, is fixed on support element, and the axis of circulating line is parallel to the supporting surface of support element and pipeline；Venthole; it is placed equidistant in the outer diameter side of circulating line; using circulating line make inert gas to be passed through path consistent with the shape of weld seam on pipeline to be welded; multiple ventholes are set simultaneously; inert gas is set to collect in the root of weld; effective protection against oxidation can be carried out to the root of weld seam, to improve welding quality.
Description
Technical field
The utility model is related to boiler technology field, especially a kind of girth welding oxygen-proof protecting device.
Background technology
Header is boiler working substance mixing, ensures the uniformly heated pipe fitting of working medium.The furnace wall of usual Industrial Boiler is by a row
The pipe of row（Water-cooling wall）Be stitched together composition, but boiler volume is huge, complicated, it cannot be guaranteed that in all pipes
The caloric receptivity of working medium is the same, and different positions caloric receptivity is mutually far short of what is expected, and installation header can allow inside each pipe
Working medium is converged herein, is gone in each pipe of next stage of reallocation, can reduce thermal deviation in this way so that the heat absorption of working medium,
Flowing, the cooling of boiler, boiler thermal efficiency all obtain optimization and improve；In addition, the specification of each section of pipe in boiler upper, middle and lower part
Size, number of tubes and arrangement are all different, and header is just responsible for each section of connection, ensures flowing smoothly for working medium.It is making
During header, it radially, axially can bore multiple holes in header cylinder and form welding grooves, then welded pipe connects on groove
Head, there are two types of pipe fitting on header cylinder is general, one is the large diameter pipe connectors that diameter is more than 101.6mm, such as header end
The hand hole pipe fitting and valve seat that lid and circumferential weld nearby open up.Another kind is the minor diameter pipe fitting that diameter is less than 101.6mm, is used for
The tube panels group such as header and economizer, superheater and reheater is welded.The minor diameter of a large amount of solid matters is welded on header cylinder overall length
Pipe fitting has plenty of the source nipple that length is less than 300mm, also has plenty of and curves definite shape length as 300~1700mm's
Long pipe fitting.
As current steel grade steps up in boiler industry, Product jointing quality requirement also improves therewith, especially
In terms of the girth welding of high-grade material, welding quality control and welding material performance, welding product run service life
Aspect earns widespread respect.And anti-oxidation work is one of important quality governing factor of the girth welding of high-grade material,
Such as utilization of SA-335P91, SA-335P92 material more universal at present in boiler header welding, in girth welding
Bottom argon arc welding anti-oxidation work it is particularly important.The anti-oxidation use of argon arc welding welding of circumferential seams of header welding currently on the market
Following manner：1）Using protection against oxidation agent is sprayed on welding groove, this mode cannot prevent header stack shell inner wall
Oxidation protection does not completely cut off welding position with air completely, and welding position is oxidizable；2）The welding of high-grade material generally requires
Preheating, about at 220 DEG C or more, existing argon arc welding oxygen-proof protecting device cannot work at high temperature temperature；3）In steel pipe
In the case of longer, it is desirable to oxidation is mounted on inside header stack shell more difficult；4）When oxidation works
Fail precise positioning position while welding, is unable to circumferential weld and carries out complete protection against oxidation.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of girth welding oxygen-proof protecting devices, can be to collection
The girth welding of case stack shell material carries out effective protection against oxidation, to improve welding quality, the welding tube head that extends header
Service life, while largely reducing the loading of inert gas.
Technical solution used by the utility model is：Girth welding oxygen-proof protecting device, including support element, for branch
Support two side ducts of Sizing In Butt Welded Pipes to be welded；Circulating line, the circulating line of the non-closed loop for being passed through inert gas are fixed
On support element, the axis of circulating line is parallel to the supporting surface of support element and pipeline；Venthole is placed equidistant in circulating line
Outer diameter side, using circulating line make inert gas to be passed through path consistent with the shape of weld seam on pipeline to be welded, simultaneously
Multiple ventholes are set, inert gas is made to collect in the root of weld, effective protection against oxidation can be carried out to the root of weld seam, from
And improve welding quality.
Further, more than two reinforcement plates are also associated on circulating line, reinforcement plate both ends are fixed on support element, are protected
The axis of circulating line is parallel to the supporting surface of support element and pipeline when card is passed through gas, to ensure that venthole can be precisely right
Welding groove sprays inert gas.
Further, support element, circulating line, reinforcement plate are made of steel, are applicable under hot conditions and carry out Welder
Make.
Further, circulating line includes the inlet port, looping tube, outlet port being sequentially connected to, and inlet port hangs down
Straight looping tube is arranged and positioned at the centrally disposed of looping tube, and the unclosed one end of looping tube is outlet port, ensures logical
The balance of looping tube is not influenced when entering inert gas.
Further, the support element include be used to support header stack shell and the first support plate disposed in parallel, second
Fagging, the first support plate, the second support plate diameter be slightly less than the internal diameter of pipeline to be welded, the first support plate, the second support plate
Between connected by more than two supporting rods；The looping tube is between the first support plate, the second support plate and is parallel to
The two is arranged, and the outer diameter of looping tube is slightly less than the diameter of the first support plate, the second support plate；The reinforcement plate is connected to ring
On shape tube body, reinforcement plate both ends are separately fixed at the first support plate, in the second support plate；The inlet port is fixed on first
On fagging, it is further ensured that the axis of circulating line when being passed through gas is parallel to the supporting surface of support element and pipeline, to ensure
Venthole precisely can spray inert gas to welding groove.
Further, the first support plate, the second support plate are stretched out in the both ends of supporting rod, and extension is supported to first
Plate, the second support plate it is centroclinal, ensure in header stack shell elapse during, can when encountering the barrier of stack shell inner wall
It passes through.
The utility model has the beneficial effects that：
（1）The utility model, can be to the root of weld seam by the way that looping tube and venthole are arranged between two pieces of support plates
Portion carries out effective protection against oxidation, to improve welding quality.
（2）Entire protective device is goed deep into inside header stack shell when welding, by inert gas packing between two support plates, makes
Welding position and air exclusion save the usage amount of inert gas.
（3）The oxygen-proof protecting device of the utility model, it is simple in structure, it is easy to use.
（4）Oxygen-proof protecting device is integrally made of steel, can be worked at high temperature, and the weldering of high-grade material is applicable in
It connects.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model girth welding oxygen-proof protecting device.
Fig. 2 is that the utility model girth welding oxygen-proof protecting device elapses process schematic into header stack shell.
Fig. 3 is that the utility model girth welding oxygen-proof protecting device is elapsed to welding groove schematic diagram.
In figure label for：1- ventholes, 2- pipelines to be welded, 3- reinforcement plates, 4- inlet ports, 5- looping tubes, 6- go out
Gas port end, the first support plates of 7-, the second support plates of 8-, 9- supporting rods, the bending part of 10- supporting rods, 11- welding grooves, 12-
Barrier.
Specific implementation mode
The utility model is further illustrated with reference to the accompanying drawings and examples.
Embodiment 1：
As shown in Figure 1, by taking the girth welding of header stack shell as an example, the girth welding protection against oxidation of the utility model fills
It sets, when making circulating line, selects the steel pipe of required length and caliber, looping tube 5 is determined according to the internal diameter of header stack shell
Outer diameter, the outer diameter of looping tube 5 are slightly less than the diameter of the first support plate 7, the second support plate 8, it is described be slightly less than both can guarantee
It can be passed through during whole device is pushed into header pipeline, the pipe for needing to be bent is calculated according to determining outer diameter
It is long, equidistantly it is provided with venthole 1 on needing the steel pipe being bent, to the curving of non-trepanning when bending, one end after bending is made
For outlet port 6, the other end is connected to as inlet port 4 with inert gas duct, on looping tube 5 near outlet port 6,
Reinforcement plate 3 is nearby welded in centre position, bending part, and reinforcement plate 3 is perpendicular to looping tube 5.
When making support element, steel plate is processed into two diameters and is slightly less than the circular steel plate of header stack shell as the first support
Plate 7, the second support plate 8, " being slightly less than " refer to that whole device can be in header stack shell after circular steel plate welds supporting rod 9
In the case of passage, only there is gap as small as possible, as far as possible between the first support plate 7, the second support plate 8 and header stack shell
Ensure to insulate the inert gas being passed through in the first support plate 7, the second support plate 8, to save the usage amount of inert gas, steel
The thickness of plate is selected according to support strength, and being provided at 7 center of the first support plate can be by the logical of circulating line inlet port 4
The inlet port 4 of circulating line is passed through through-hole, makes inlet port 4 perpendicular to the first support plate 7 and be welded to first by hole
In support plate 7, after the completion of welding, the both ends of reinforcement plate 3 are welded on the first support plate 7, in the second support plate 8, by first
Spacing between fagging 7, the second support plate 8 reduces as far as possible in the case where dynamics is made in guarantee, then processes steel plate
At column as then using at both ends as supporting rod 9 to same direction bending, supporting rod 9 is equidistantly then welded on first
The side of support plate 7, the second support plate 8, supporting rod 9 are each perpendicular to the first support plate 7, the welding of the second support plate 8 and supporting rod
Bending part 10 towards support plate center, supporting rod 9 and the contact surface of header stack shell form supporting surface.
To use the oxygen-proof protecting device of the utility model to carry out the welding of high-alloy steel material circumferential seams of header, and use argon
It is illustrated for arc welding prime coat：
Header barrel sizes are 711 × 50mm of Ф, and header stack shell material is SA-335P92, is welded using bottom argon arc welding
It connects, argon gas is passed through in circulating line, when being welded using oxidation protection device described in the utility model, welded according to the following steps
It connects：
（a）Welding groove 11 on two header stack shells to be welded is aligned, ensures two header stack shell coaxial placements；
（b）Inert gas duct connection circulating line is arrived into inlet port 4, ensures that gas can pass through ring pipe
Road；
（c）As shown in Fig. 2, by girth welding oxygen-proof protecting device under passage to welding groove 11 inside header stack shell
Side, makes looping tube 5 be in the centre position of welding groove 11, i.e. position shown in Fig. 3, during passage, inlet port 4
Axis remains parallel with the axis of header stack shell, during passage, in case of header stack shell inner wall has barrier 12, supporting rod
Bending part 10 can clear the jumps and 12 continue to move ahead；
（d）Welding groove 11 to be welded is preheated；
（e）After preheating, argon gas switch is opened, argon gas is passed through into circulating line, waiting 60 to 120s is by first
Girth welding is carried out to welding groove 11 after air discharge between fagging 7, the second support plate 8, is persistently led into circulating line
Enter inert gas until welding completion, oxygen-free environment is provided for welding；
（f）Girth welding oxygen-proof protecting device is taken out after welding, prune job scene.
Using the girth welding oxygen-proof protecting device and welding method of the utility model to high-alloy steel material pipe ring
Seam welding carries out protection against oxidation, and device is simple and quick during protection, is detected through profession and welds root non-oxidation phenomenon,
The welding quality for improving circumferential weld, it is impacted to ensure that product quality in kind, while a large amount of argon gas has been saved, it reduces
Cost.
Claims (6)
1. girth welding oxygen-proof protecting device, it is characterised in that：Including
Support element is used to support pipeline to be welded（2）Two side ducts of butt weld；
Circulating line, the circulating line of the non-closed loop for being passed through inert gas, is fixed on support element, the axis of circulating line
It is parallel to the supporting surface of support element and pipeline；
Venthole（1）, it is placed equidistant in the outer diameter side of circulating line.
2. girth welding oxygen-proof protecting device as described in claim 1, it is characterised in that：Two are also associated on circulating line
A above reinforcement plate（3）, reinforcement plate（3）Both ends are fixed on support element.
3. girth welding oxygen-proof protecting device as claimed in claim 2, it is characterised in that：Support element, circulating line, lacing wire
Plate（3）It is made of steel.
4. girth welding oxygen-proof protecting device as claimed in claim 2 or claim 3, it is characterised in that：Circulating line includes sequentially
The inlet port of connection（4）, looping tube（5）, outlet port（6）, inlet port（4）Vertical ring-shaped tube body（5）Setting and position
In looping tube（5）Centrally disposed, looping tube（5）Unclosed one end is outlet port（6）.
5. girth welding oxygen-proof protecting device as claimed in claim 4, it is characterised in that：
The support element includes being used to support header stack shell and the first support plate disposed in parallel（7）, the second support plate（8）, the
One support plate（7）, the second support plate（8）Diameter be slightly less than pipeline to be welded（2）Internal diameter, the first support plate（7）, second
Fagging（8）Between pass through more than two supporting rods（9）Connection；
The looping tube（5）Positioned at the first support plate（7）, the second support plate（8）Between and both be parallel to setting, and annular
Tube body（5）Outer diameter be slightly less than the first support plate（7）, the second support plate（8）Diameter；
The reinforcement plate（3）It is connected to looping tube（5）On, reinforcement plate（3）Both ends are separately fixed at the first support plate（7）,
Two support plates（8）On；
The inlet port（4）It is fixed on the first support plate（7）On.
6. girth welding oxygen-proof protecting device as claimed in claim 5, it is characterised in that：Supporting rod（9）Both ends stretch out
First support plate（7）, the second support plate（8）, and extension is to the first support plate（7）, the second support plate（8）Center incline
Tiltedly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721890204.2U CN207806945U (en) | 2017-12-29 | 2017-12-29 | Girth welding oxygen-proof protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721890204.2U CN207806945U (en) | 2017-12-29 | 2017-12-29 | Girth welding oxygen-proof protecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207806945U true CN207806945U (en) | 2018-09-04 |
Family
ID=63327647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721890204.2U Active CN207806945U (en) | 2017-12-29 | 2017-12-29 | Girth welding oxygen-proof protecting device |
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| Country | Link |
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| CN (1) | CN207806945U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108098204A (en) * | 2017-12-29 | 2018-06-01 | 东方电气集团东方锅炉股份有限公司 | Girth welding oxygen-proof protecting device and its header stack shell welding method |
| CN111390360A (en) * | 2020-03-27 | 2020-07-10 | 中船澄西船舶修造有限公司 | Welding seam back gas protection device for stainless steel welding |
| CN113319500A (en) * | 2021-05-18 | 2021-08-31 | 大连交通大学 | Vacuum chuck type welding seam back anti-oxidation device |
-
2017
- 2017-12-29 CN CN201721890204.2U patent/CN207806945U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108098204A (en) * | 2017-12-29 | 2018-06-01 | 东方电气集团东方锅炉股份有限公司 | Girth welding oxygen-proof protecting device and its header stack shell welding method |
| CN111390360A (en) * | 2020-03-27 | 2020-07-10 | 中船澄西船舶修造有限公司 | Welding seam back gas protection device for stainless steel welding |
| CN113319500A (en) * | 2021-05-18 | 2021-08-31 | 大连交通大学 | Vacuum chuck type welding seam back anti-oxidation device |
| CN113319500B (en) * | 2021-05-18 | 2023-10-20 | 大连交通大学 | Vacuum chuck type weld joint back oxidation preventing device |
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