CN101569952A - Method for welding bulk boiler pipeline - Google Patents
Method for welding bulk boiler pipeline Download PDFInfo
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- CN101569952A CN101569952A CNA2009100594390A CN200910059439A CN101569952A CN 101569952 A CN101569952 A CN 101569952A CN A2009100594390 A CNA2009100594390 A CN A2009100594390A CN 200910059439 A CN200910059439 A CN 200910059439A CN 101569952 A CN101569952 A CN 101569952A
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- welding
- pipeline
- bulk
- boiler
- boiler pipeline
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Abstract
The invention discloses a method for welding a bulk boiler pipeline, mainly comprising the steps as follows: closing all valves of the bulk boiler pipeline so as to prevent air in the pipeline from communicating with outside, when pipeline installation comes to an end; then, opening valves nearest to a welding line to be welded, and introducing protective gas into the pipeline through the valve for reducing air density; and welding after 1-15 minutes. In the invention, the welding technique is very simple and the pass percent for repairing welding lines is as high as 95percent, thereby remarkably improving the welding quality of bulk boilers and saving the installation cost of bulk boilers to a large extent.
Description
Technical field
The present invention relates to a kind of welding procedure measure, specifically be meant a kind of method for welding bulk boiler pipeline.
Background technology
Because the field joint of the boiler in bulk that boiler for producing in bulk manufacturer is produced is all a lot, and these weld seams arrange very closely, and in order to ensure safe in utilization, these boilers in bulk all must carry out the 100%X ray detection, to be up to state standards.In long practice, particularly in welding job latter stage, after all weld seams all welded on request and detect, the weld seam that always has the part in bulk boiler tubing need be reprocessed.In reprocessing the weld seam process, though the welding of welder's strictness according to welding procedure, but still do not reach the detection requirement, qualification rate is almost nil.
Therefore, the weld seam process of reprocessing of bulk boiler pipeline is the technical barrier that the person skilled in art does not capture always, has not only seriously influenced the qualification rate of reprocessing of boiler in bulk, but also has wasted great amount of manpower and material resources.
Summary of the invention
The objective of the invention is to overcome the almost nil defective of the weld is accepted rate of reprocessing of existing bulk boiler pipeline, provide a kind of not only welding technique simple and practical, and the feasible very high method for welding bulk boiler pipeline of weld is accepted rate of reprocessing.
Purpose of the present invention is achieved through the following technical solutions: mainly may further comprise the steps: when the pipeline installation draws to an end, turn-off all valves of bulk boiler pipeline, to break off air and extraneous circulation in the pipeline; Then, the nearest valve of weld seam of opening Yu will welding, and in pipeline, feed the protective gas that is used to reduce atmospheric density by this valve; After 1～15 minute, weld again.
In order better to realize the present invention, described protective gas can adopt inert gas.
When the present invention adopts inert gas, preferentially adopt the argon gas in the inert gas.
The present invention compared with prior art, not only Han Jie process is very simple, and reprocess the qualification rate of weld seam can be up to 95%, thereby saved the installation cost of boiler in bulk significantly.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
Through studying for a long time and repeatedly practising, the applicant has found the pipeline of boiler in bulk is being reprocessed in the process of weld seam, particularly be installed latter stage at pipeline, the pipeline of boiler in bulk has formed the loop of sealing, there is a large amount of air in the pipeline, when reprocessing weld seam, because the air in the pipeline can form wind with extraneous air is interactive, and caliber is more little, big more this phenomenon of wind-force.
Because during welding, the existence of wind has fatal influence to the quality of welding, therefore the applicant has adopted following steps to overcome this influence when bulk boiler pipeline is reprocessed weld seam: at first, turn-off all valves of bulk boiler pipeline, the wind that forms to break off air and outside air in the pipeline to circulate mutually.In the welding process of reality, the nearest pipeline of arrangement and valve welds at last as far as possible, when the pipeline installation draws to an end, close all pipeline valves especially, particularly is about near the valve of weld seam of welding.
Then, the nearest pipeline valve of weld seam of opening Yu will welding, and in pipeline, feed protective gas; Or directly in pipeline, feed protective gas from the opening part of weld seam.According to practice, this protective gas can adopt inert gas, can reduce atmospheric density, and other harmless gases, as nitrogen, argon gas etc.Because inert gas includes helium, argon gas, radon gas etc., according to practice, when adopting inert gas, its optimal gas is for adopting argon gas.
At last, the weld seam to needs welds again, is preferably in the ventilation back and can welds after 1～15 minute.Too many in order to prevent the protective gas waste, reduce cost, and can be good at welding, its Best Times can weld for ventilation in back 10 minutes.After welding finishes, close protective gas.
Because after charging into protective gas, this protective gas will filled the air in the commissure in the pipeline, thereby reduces the atmospheric density of commissure, also is equivalent to emptying process is carried out in this commissure.Certainly, if this commissure also has rust or water, then adopt conventional means to handle after, just can weld.Through experiment repeatedly, according to the weld seam that above method is reprocessed, its qualification rate can be up to 95%.
As mentioned above, just can realize the present invention preferably.
Claims (4)
1, a kind of method for welding bulk boiler pipeline, it is characterized in that, mainly may further comprise the steps: draw to an end in pipelayer's journey, carry out pipeline welding or weld seam when reprocessing, at first turn-off all valves of bulk boiler pipeline, to break off air and extraneous circulation in the pipeline; Then, the nearest valve of weld seam of opening Yu will welding, and in pipeline, feed protective gas by this valve, be used to reduce atmospheric density; After 1～15 minute, weld again.
2, a kind of method for welding bulk boiler pipeline according to claim 1 is characterized in that, described protective gas is an inert gas.
3, a kind of method for welding bulk boiler pipeline according to claim 1 is characterized in that, described protective gas is a nitrogen.
4, a kind of method for welding bulk boiler pipeline according to claim 2 is characterized in that, described inert gas is an argon gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100594390A CN101569952A (en) | 2009-05-27 | 2009-05-27 | Method for welding bulk boiler pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100594390A CN101569952A (en) | 2009-05-27 | 2009-05-27 | Method for welding bulk boiler pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101569952A true CN101569952A (en) | 2009-11-04 |
Family
ID=41229506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100594390A Pending CN101569952A (en) | 2009-05-27 | 2009-05-27 | Method for welding bulk boiler pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101569952A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400200A (en) * | 2014-11-27 | 2015-03-11 | 广东省工业技术研究院(广州有色金属研究院) | Flash butt welding process for high-pressure boiler pipeline |
| CN104690488A (en) * | 2015-02-10 | 2015-06-10 | 衡阳市大成锅炉有限公司 | Method for assembling large-sized single-drum boiler body |
-
2009
- 2009-05-27 CN CNA2009100594390A patent/CN101569952A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400200A (en) * | 2014-11-27 | 2015-03-11 | 广东省工业技术研究院(广州有色金属研究院) | Flash butt welding process for high-pressure boiler pipeline |
| CN104690488A (en) * | 2015-02-10 | 2015-06-10 | 衡阳市大成锅炉有限公司 | Method for assembling large-sized single-drum boiler body |
| CN104690488B (en) * | 2015-02-10 | 2017-05-03 | 衡阳市大成锅炉有限公司 | Method for assembling large-sized single-drum boiler body |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20091104 |