CN108098204A - Girth welding oxygen-proof protecting device and its header stack shell welding method - Google Patents
Girth welding oxygen-proof protecting device and its header stack shell welding method Download PDFInfo
- Publication number
- CN108098204A CN108098204A CN201711468467.9A CN201711468467A CN108098204A CN 108098204 A CN108098204 A CN 108098204A CN 201711468467 A CN201711468467 A CN 201711468467A CN 108098204 A CN108098204 A CN 108098204A
- Authority
- CN
- China
- Prior art keywords
- welding
- support plate
- circulating line
- stack shell
- protecting device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000011261 inert gas Substances 0.000 claims abstract description 24
- 230000002787 reinforcement Effects 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 10
- 230000003064 anti-oxidating effect Effects 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 abstract description 12
- 238000007254 oxidation reaction Methods 0.000 abstract description 12
- 238000004513 sizing Methods 0.000 abstract 1
- 239000011257 shell material Substances 0.000 description 26
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 18
- 241001016380 Reseda luteola Species 0.000 description 9
- 229910052786 argon Inorganic materials 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 238000005452 bending Methods 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- 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
- B23K9/32—Accessories
-
- 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
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of girth welding oxygen-proof protecting device and its header stack shell welding methods, including supporting item, are used to support two side ducts of Sizing In Butt Welded Pipes to be welded；Circulating line for being passed through the circulating line of the non-closed loop of inert gas, is fixed on supporting item, and the axis of circulating line is parallel to supporting item and the supporting surface of pipeline；Venthole; it is placed equidistant in the outer diameter one 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 made to collect in the root of weld; effective protection against oxidation can be carried out to the root of weld seam, so as to improve welding quality.
Description
Technical field
The present invention relates to boiler technology field, especially a kind of girth welding oxygen-proof protecting device and its weldering of header stack shell
Connect method.
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 (water-cooling wall) of row is stitched together composition, but boiler volume is huge, complicated, it is impossible to ensure 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 so reduce thermal deviation 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, a kind of is the large diameter pipe connector 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 operation 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 popularized at present in boiler header welding, in girth welding
Bottom argon arc welding anti-oxidation work it is particularly important.Anti-oxidation use is welded in the argon arc welding of circumferential seams of header welding currently on the market
In the 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) welding of high-grade material generally requires
Preheating, for temperature about at 220 DEG C or more, existing argon arc welding oxygen-proof protecting device cannot be working at high 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, it is impossible to which circumferential weld carries out complete protection against oxidation.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of girth welding oxygen-proof protecting device and its header stack shell
Welding method can carry out effective protection against oxidation to the girth welding of header stack shell material, so as to improve welding quality, extend
The service life of the welding tube head of header, while largely reduce the loading of inert gas.
The technical solution adopted in the present invention is：Girth welding oxygen-proof protecting device including supporting item, is used to support and treats
Two side ducts of welded pipe line butt weld；Circulating line for being passed through the circulating line of the non-closed loop of inert gas, is fixed on branch
In support member, the axis of circulating line is parallel to supporting item and the supporting surface of pipeline；Venthole is placed equidistant in circulating line
Outer diameter one side, using circulating line make inert gas to be passed through path consistent with the shape of weld seam on pipeline to be welded, set simultaneously
Multiple ventholes are put, 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, so as to
Improve welding quality.
Further, more than two reinforcement plates are also associated on circulating line, reinforcement plate both ends are fixed on supporting item, are protected
The axis of circulating line is parallel to supporting item and the supporting surface of pipeline when card is passed through gas, so as to ensure that venthole can be precisely right
Welding groove sprays inert gas.
Further, supporting item, 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, the outlet port that sequentially connect, and inlet port hangs down
Straight looping tube sets 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 supporting item include be used to support header stack shell and be arranged in parallel the first support plate, second
Fagging, the first support plate, the diameter of the second support plate are 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 between the first support plate, the second support plate and parallel to
The two is set, and the outer diameter of looping tube is slightly less than the first support plate, the diameter of 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, the axis of circulating line when being passed through gas is further ensured that parallel to supporting item and the supporting surface of pipeline, so as 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 running into the barrier of stack shell inner wall
It passes through.
Header stack shell welding method is welded using above-mentioned girth welding oxygen-proof protecting device：Comprise the following steps：
(a) welding groove on two header stack shells to be welded is alignd, ensures two header stack shell coaxial placements；
(b) by inert gas duct connection circulating line to inlet port, ensure that gas can pass through circulating line；
(c) girth welding oxygen-proof protecting device to the inside of header stack shell is elapsed to welding groove, makes ring pipe
Body is in the centre position of welding groove；
(d) welding groove to be welded is preheated；
(e) after preheating, inert gas is passed through into circulating line, waits 60 to 120s by the first support plate, second
Girth welding is carried out to welding groove after air discharge between support plate；
(f) girth welding oxygen-proof protecting device is taken out after welding, prune job scene.
Further, in step (c), during passage, the axis of inlet port remains the axis with header stack shell
It is parallel.
Further, in step (e), inert gas is continually fed into circulating line until welding is completed.
The beneficial effects of the invention are as follows：
(1) present invention is between two pieces of support plates by setting looping tube and venthole, can to the root of weld seam into
The effective protection against oxidation of row, so as to improve welding quality.
(2) entire protective device is goed deep into inside header stack shell when welding, and by inert gas packing between two support plates, makes
Welding position and air exclusion save the usage amount of inert gas.
(3) oxygen-proof protecting device of the invention, it is simple in structure, it is easy to use.
(4) oxygen-proof protecting device is integrally made of steel, can working at high temperature, be applicable in the weldering of high-grade material
It connects.
Description of the drawings
Fig. 1 is the structure diagram of girth welding oxygen-proof protecting device of the present invention.
Fig. 2 is that girth welding oxygen-proof protecting device of the present invention elapses process schematic into header stack shell.
Fig. 3 is that girth welding oxygen-proof protecting device of the present invention is elapsed to welding groove schematic diagram.
In figure mark 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 embodiment
The present invention is further described 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, girth welding oxygen-proof protecting device of the invention, system
When making circulating line, the steel pipe of length needed for selection and caliber determines the outer diameter of looping tube 5 according to the internal diameter of header stack shell,
The outer diameter of looping tube 5 is slightly less than the first support plate 7, the diameter of the second support plate 8, described to be slightly less than that both can guarantee be entire
It can be passed through during in device push-in header pipeline, being calculated according to definite outer diameter needs curved pipe range,
It needs equidistantly to be provided with venthole 1 on curved steel pipe, to the curving of non-perforate during bending, one end after bending is as outlet
Mouth end 6, the other end is connected as inlet port 4 with inert gas duct, on looping tube 5 near outlet port 6, interposition
It puts, reinforcement plate 3 is nearby welded in bending part, and reinforcement plate 3 is perpendicular to looping tube 5.
When making supporting item, 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, whole device can be in header stack shell after " being slightly less than " refers to circular steel plate welding 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 the inert gas that will be passed through packing in the first support plate 7, the second support plate 8, so as 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
Hole by the inlet port 4 of circulating line through through hole, makes inlet port 4 perpendicular to the first support plate 7 and is welded to first
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 ensureing that dynamics is made, and then processes steel plate
It bends as supporting rod 9 and uses to same direction as and then using both ends into column, supporting rod 9 is equidistantly then welded on first
The side of support plate 7, the second support plate 8, supporting rod 9 is each perpendicular to the first support plate 7, the second support plate 8 is welded and supporting rod
Bending part 10 towards support plate center, supporting rod 9 and the contact surface of header stack shell form supporting surface.
The oxygen-proof protecting device of the present invention to be used to carry out the welding of high-alloy steel material circumferential seams of header, and using argon arc welding
It is illustrated exemplified by 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,
Argon gas is passed through in circulating line, when being welded using oxidation protection device of the present invention, is welded according to the following steps：
(a) welding groove 11 on two header stack shells to be welded is alignd, ensures two header stack shell coaxial placements；
(b) inert gas duct connection circulating line to inlet port 4, guarantee gas can be passed through annular by (b)
Pipeline；
(c) as shown in Fig. 2, being elapsed girth welding oxygen-proof protecting device to welding groove 11 to the inside of 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, the axis of inlet port 4
Line remains parallel with the axis of header stack shell, during passage, if header stack shell inner wall has barrier 12, supporting rod
Bending part 10, which can clear the jumps, 12 to be continued 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, wait 60 to 120s 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 present invention to high-alloy steel material pipeline circular seam welding
Row protection against oxidation is tapped into, device is simple and quick during protection, is detected through specialty and welds root non-oxidation phenomenon, is promoted
The welding quality of circumferential weld, it is impacted so as to ensure that product quality in kind, while saved substantial amounts of argon gas, it reduces into
This.
Claims (9)
1. girth welding oxygen-proof protecting device, it is characterised in that：Including
Supporting item is used to support two side ducts of pipeline to be welded (2) butt weld；
Circulating line for being passed through the circulating line of the non-closed loop of inert gas, is fixed on supporting item, the axis of circulating line
Parallel to supporting item and the supporting surface of pipeline；
Venthole (1) is placed equidistant in the outer diameter one 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 Yi Shang reinforcement plate (3), reinforcement plate (3) both ends are fixed on supporting item.
3. girth welding oxygen-proof protecting device as claimed in claim 2, it is characterised in that：Supporting item,
Circulating line, reinforcement plate (3) are made of steel.
4. girth welding oxygen-proof protecting device as described in claims 1 to 3, it is characterised in that：Circulating line is included sequentially
Inlet port (4), looping tube (5), the outlet port (6) of connection, inlet port (4) vertical ring-shaped tube body (5) is set and position
In the centrally disposed of looping tube (5), the unclosed one end of looping tube (5) is outlet port (6).
5. girth welding oxygen-proof protecting device as claimed in claim 4, it is characterised in that：
The supporting item includes the first support plate (7), the second support plate (8) that are used to support header stack shell and are arranged in parallel, the
One support plate (7), the diameter of the second support plate (8) are slightly less than the internal diameter of pipeline to be welded (2), the first support plate (7), second
It is connected between fagging (8) by more than two supporting rods (9)；
The looping tube (5) is set between the first support plate (7), the second support plate (8) and parallel to the two, and annular
The outer diameter of tube body (5) is slightly less than the first support plate (7), the diameter of the second support plate (8)；
The reinforcement plate (3) is connected on looping tube (5), and reinforcement plate (3) both ends are separately fixed at the first support plate (7),
In two support plates (8)；
The inlet port (4) is fixed in the first support plate (7).
6. girth welding oxygen-proof protecting device as claimed in claim 5, it is characterised in that：The both ends of supporting rod (9) are stretched out
First support plate (7), the second support plate (8), and the center of extension to the first support plate (7), the second support plate (8) is inclined
Tiltedly.
7. header stack shell welding method, it is characterised in that：It is anti-oxidation using claim 1 to 6 any one of them girth welding
Protective device is welded：Comprise the following steps：
(a) welding groove (11) on two header stack shells to be welded is alignd, ensures two header stack shell coaxial placements；
(b) by inert gas duct connection circulating line to inlet port (4), ensure that gas can pass through circulating line；
(c) girth welding oxygen-proof protecting device to the inside of header stack shell is elapsed to welding groove (11), makes ring pipe
Body (5) is in the centre position of welding groove (11)；
(d) welding groove (11) to be welded is preheated；
(e) after preheating, be passed through inert gas into circulating line, wait 60 to 120s by the first support plate (7), second
Girth welding is carried out to welding groove (11) after air discharge between fagging (8)；
(f) girth welding oxygen-proof protecting device is taken out after welding, prune job scene.
8. header stack shell welding method as claimed in claim 7, it is characterised in that：In step (c), during passage, air inlet
The axis at mouth end (4) remains parallel with the axis of header stack shell.
9. header stack shell welding method as claimed in claim 7, it is characterised in that：In step (e), continue into circulating line
Inert gas is passed through until welding is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711468467.9A CN108098204A (en) | 2017-12-29 | 2017-12-29 | Girth welding oxygen-proof protecting device and its header stack shell welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711468467.9A CN108098204A (en) | 2017-12-29 | 2017-12-29 | Girth welding oxygen-proof protecting device and its header stack shell welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108098204A true CN108098204A (en) | 2018-06-01 |
Family
ID=62214530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711468467.9A Pending CN108098204A (en) | 2017-12-29 | 2017-12-29 | Girth welding oxygen-proof protecting device and its header stack shell welding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108098204A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112475671A (en) * | 2020-10-21 | 2021-03-12 | 东方电气集团东方锅炉股份有限公司 | Assembly and gas protection device for welding thin-walled pipe and header angle |
| CN113319500A (en) * | 2021-05-18 | 2021-08-31 | 大连交通大学 | Vacuum chuck type welding seam back anti-oxidation device |
| CN114054916A (en) * | 2021-11-29 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Gas conveying device and steel rail flash welding method |
| CN114192939A (en) * | 2021-12-31 | 2022-03-18 | 上海华谊建设有限公司 | Zirconium material welding process |
| CN114248047A (en) * | 2021-12-03 | 2022-03-29 | 渤海造船厂集团有限公司 | Flexible continuous clean welding back gas protection device |
| CN115592247A (en) * | 2022-10-24 | 2023-01-13 | 立之力机械（广州）股份有限公司（Cn） | Plasma welding machine for welding tank body |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112475671A (en) * | 2020-10-21 | 2021-03-12 | 东方电气集团东方锅炉股份有限公司 | Assembly and gas protection device for welding thin-walled pipe and header angle |
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| 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 |
| CN114054916A (en) * | 2021-11-29 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Gas conveying device and steel rail flash welding method |
| CN114248047A (en) * | 2021-12-03 | 2022-03-29 | 渤海造船厂集团有限公司 | Flexible continuous clean welding back gas protection device |
| CN114192939A (en) * | 2021-12-31 | 2022-03-18 | 上海华谊建设有限公司 | Zirconium material welding process |
| CN115592247A (en) * | 2022-10-24 | 2023-01-13 | 立之力机械（广州）股份有限公司（Cn） | Plasma welding machine for welding tank body |
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Application publication date: 20180601 |