CN102357707A - Welding method for connecting welding joint of boiler smoke pipe and pipe plates by adopting internal bore welding - Google Patents
Welding method for connecting welding joint of boiler smoke pipe and pipe plates by adopting internal bore welding Download PDFInfo
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- CN102357707A CN102357707A CN2011102681598A CN201110268159A CN102357707A CN 102357707 A CN102357707 A CN 102357707A CN 2011102681598 A CN2011102681598 A CN 2011102681598A CN 201110268159 A CN201110268159 A CN 201110268159A CN 102357707 A CN102357707 A CN 102357707A
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Abstract
The invention relates to a welding method for a connecting welding joint of a boiler smoke pipe and pipe plates by adopting internal bore welding, which comprises the following steps: (1) forming pipe holes in the pipe plates; (2) inserting the smoke pipe into the pipe holes; and (3) carrying out internal bore welding between the smoke pipe and the pipe holes in the pipe plates in the smoke pipe, thereby forming an annular welding joint of the smoke pipe and the pipe plate. The welding method has the beneficial effects that the connecting strength is high, and cracks of the pipe plates are prevented from generating.
Description
Technical field
The present invention relates to a kind of welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld.
Background technology
Pan shell type (fire tube) boiler and fire tube boiler are the major products in the Industrial Boiler.The heating surface of the heat convection of boiler, generally by tube sheet, smoke pipe (fire tube) is formed, and tube sheet and smoke pipe (fire tube) link together through the method for welding.Smoke pipe is light pipe, screwed pipe, or other forms of tubing.Adopt the method for machining to produce pore on the tube sheet; Smoke pipe inserts the pore on the tube sheet, uses SMAW or tube sheet to weld automatically then, adopt angle welding with smoke pipe 2 ' with tube sheet 1 ' weld together; See Fig. 1, thereby form the heating surface of the heat convection of boiler.
Adopt the mode of angle welding welding to make and have the gap between the pore of smoke pipe and tube sheet; When boiler operatiopn, pot water gets in the gap between smoke pipe and the pore, is prone to form incrustation scale; The heat transfer process of incrustation scale meeting heavy damage pot water and metal; And under the comprehensive function of the various stress of boiler, boiler's tube-plate is prone to produce tube-plate fracture, causes the potential safety hazard of boiler or scraps.
Summary of the invention
There is the problem that bonding strength is not high, tube sheet is prone to crack in the connected mode that the present invention will solve between existing boiler upper smoke tube and the tube sheet, the welding method that the employing internal bore welding that provides a kind of bonding strength height, tube sheet can not produce the crack welds Boiler smoke tube and tube sheet attachment weld.
The technical scheme that the present invention adopts is:
A kind of welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld, its step is following:
(1) on tube sheet, produces pore;
(2) smoke pipe is inserted in the pore;
(3) between the pore on smoke pipe and each tube sheet, in said smoke pipe, carry out internal bore welding and be welded to connect, formed the circular weld that connects smoke pipe and tube sheet.
Further, after step (3), carrying out step (4) carries out angle welding with the outside of the outer end of smoke pipe and pore and is welded to connect.
Further, when carrying out step (2), the outer end of smoke pipe is passed pore, step (4) is between the outer end of smoke pipe and the pore outside, to carry out angle welding to be welded to connect.
Perhaps, when carrying out step (2), the outer end of smoke pipe is arranged in the pore, step (4) is between the end of the outer end of smoke pipe and pore inner surface, to adopt angle welding to be welded to connect.
Perhaps; In the preceding elder generation of step (2) end of smoke pipe and the inner end inner surface of pore all are provided with forming V-shape or U-shaped groove; When carrying out step (2), the end of smoke pipe is inserted in the pore, smoke pipe in the step (3) and pore are to carry out internal bore welding at the groove place to be welded to connect.
Perhaps; In the preceding elder generation of step (2) V-butt all is arranged in the end of smoke pipe and the inner end end face of pore; When carrying out step (2), the end of smoke pipe is connected with the tube sheet butt joint, smoke pipe in the step (3) and pore are to be welded to connect through internal bore welding at the groove place.
Technical conceive of the present invention is to have adopted the method for attachment of internal bore welding that the smoke pipe of boiler and the attachment weld of tube sheet are welded, and perhaps adopts internal bore welding to add the method welding smoke pipe of angle welding welding and the attachment weld of tube sheet simultaneously.Seal pot water and got into the passage between smoke pipe and the pore, improved the bonding strength of smoke pipe and tube sheet, effectively prevented the generation of tube-plate fracture.Internal bore welding: be a kind of special-purpose internal bore welding welding machine that uses, the method that in the pore of pipe, adopts arc welding to weld forms the welding method of the attachment weld of tube-to-tube sheet connection.The connection weld seam that forms can adopt the method for not adding welding wire or adding welding wire to realize.
The welding method of employing internal bore welding welding Boiler smoke tube of the present invention and tube sheet attachment weld is applicable to horizontal extreme misery pipe coal-burning boiler and pan shell type multitubular boiler.
Beneficial effect of the present invention: bonding strength is good, prevents that tube-plate fracture from producing.
Description of drawings
Fig. 1 is the sketch map that is welded to connect of existing smoke pipe and tube sheet.
Fig. 2 is first kind of syndeton sketch map of smoke pipe of the present invention and tube sheet.
Fig. 3 is the enlarged drawing at A place among Fig. 2.
Fig. 4 is the enlarged drawing at B place among Fig. 2.
Fig. 5 is second kind of syndeton sketch map of smoke pipe of the present invention and tube sheet.
Fig. 6 is the enlarged drawing at C place among Fig. 5.
Fig. 7 is the enlarged drawing at D place among Fig. 5.
Fig. 8 is the third syndeton sketch map of smoke pipe of the present invention and tube sheet.
Fig. 9 is the enlarged drawing at E place among Fig. 8.
Figure 10 is the 4th a kind of syndeton sketch map of smoke pipe of the present invention and tube sheet.
Figure 11 is the enlarged drawing at F place among Figure 10.
Figure 12 is the application sketch map of the present invention in horizontal extreme misery pipe coal-burning boiler.
Figure 13 is the application sketch map of the present invention in the pan shell type multitubular boiler.
The specific embodiment
Come the present invention is further specified below in conjunction with specific embodiment, but do not limit the invention to these specific embodiment.One skilled in the art would recognize that the present invention contained in claims scope all alternatives, improvement project and the equivalents that possibly comprise.
Embodiment one
Referring to Fig. 2-4, a kind of welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld, its step is following:
(1) on tube sheet 1, produces pore;
(2) smoke pipe 2 is inserted in the pore;
(3) be welded to connect in said smoke pipe 2, carrying out internal bore welding between the pore on smoke pipe 2 and each tube sheet, formed the circular weld that connects smoke pipe and tube sheet.
After step (3), carrying out step (4) carries out angle welding with the outside of the outer end of smoke pipe 2 and pore and is welded to connect.
When carrying out step (2), the outer end of smoke pipe 2 is passed pore 5-7mm, step (4) is between the outer end of smoke pipe 2 and pore outer end, to carry out angle welding to be welded to connect.
Present embodiment adopts internal bore welding to add the method welding smoke pipe 2 of angle welding welding and the attachment weld of tube sheet 1 simultaneously.Sealed pot water and got into the passage between smoke pipe 2 and the pore, improved the bonding strength of smoke pipe 2, effectively prevented the generation of tube sheet 1 crackle with tube sheet 1.
Embodiment two
Referring to pressing Fig. 5-7; When the difference of present embodiment and embodiment one is to carry out step (2); The outer end of smoke pipe 2 is arranged in the pore, and smoke pipe 2 ends are 5-8mm from the pore outside, and step (4) is between the end of the outer end of smoke pipe 2 and pore inner surface, to adopt angle welding to be welded to connect.All the other 26S Proteasome Structure and Functions are all identical with embodiment one.
Embodiment three
Referring to Fig. 8, Fig. 9; The difference of present embodiment and embodiment one is in the preceding elder generation of step (2) end of smoke pipe 2 and the inner end inner surface of pore all to be provided with forming V-shape or U-shaped groove; When carrying out step (2); The end of smoke pipe 2 is inserted into 2-3mm in the pore, and the smoke pipe 2 in the step (3) is to carry out internal bore welding at the groove place to be welded to connect with pore.Present embodiment has only adopted the method for attachment of internal bore welding that the smoke pipe 2 of boiler and the attachment weld of tube sheet 1 are welded.All the other 26S Proteasome Structure and Functions are all identical with embodiment one.
Embodiment four
Referring to Figure 10, Figure 11; The difference of present embodiment and embodiment three is in the preceding elder generation of step (2) V-butt all to be arranged in the end of smoke pipe 2 and the inner end end face of pore; When carrying out step (2); The end of smoke pipe 2 is connected with tube sheet 1 butt joint, and the smoke pipe 2 in the step (3) is to be welded to connect through internal bore welding at the groove place with pore.All the other 26S Proteasome Structure and Functions are all identical with embodiment one.
Embodiment five
The application of the present invention in horizontal extreme misery pipe coal-burning boiler, shown in figure 12.Said horizontal extreme misery pipe coal-burning boiler comprises shell 5; The front and back end of said shell 5 is separately installed with front tube sheet 3 and back tube sheet 7; Said shell 5 belows are equipped with collection case 10; Water screen tube 4, down-comer 9, rear shed pipe 8 are installed between said collection case 10 and the shell 5; All have pore on said front tube sheet 3, the back tube sheet 7, be fitted with smoke pipe 6 in the said pore, all adopt the welding method of employing internal bore welding welding Boiler smoke tube of the present invention and tube sheet attachment weld to be welded to connect between the pore on said smoke pipe 6 and each tube sheet.
In order to reduce production costs, reduce user's burden, present embodiment also can only adopt the welding method of internal bore welding when smoke pipe 6 welds with the two return porch of the flue gas flow of the boiler of back tube sheet 7.Still adopt conventional angle welding welding manner welding at smoke pipe 6 and other positions of front tube sheet 3, back tube sheet 7.
Embodiment six
The application of the present invention in the pan shell type multitubular boiler, shown in figure 13.Said pan shell type multitubular boiler comprises shell 13; The front and back end of said shell 13 is separately installed with front tube sheet 11 and back tube sheet 15; Flue 12 is installed in the said shell 13 and strile-backs chamber 18; Said front and back end of strile-bacing chamber 18 is separately installed with strile-back the chamber front tube sheet 16 and the chamber back tube sheet 17 that strile-backs; All have pore on said front tube sheet 11, back tube sheet 15, the chamber front tube sheet 16 that strile-backs, be fitted with smoke pipe 14 in the said pore, all adopt the welding method of employing internal bore welding welding Boiler smoke tube of the present invention and tube sheet attachment weld to be welded to connect between the pore on said smoke pipe 14 and each tube sheet.
In order to reduce production costs, reduce user's burden, present embodiment also can only adopt the welding method of internal bore welding when smoke pipe 14 welds with the chamber front tube sheet 16 that strile-backs.Being connected between smoke pipe 14 and front tube sheet 11, back tube sheet 15 still adopted conventional angle welding welding manner.
Claims (6)
1. welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld, its step is following:
(1) on tube sheet, produces pore;
(2) smoke pipe is inserted in the pore;
(3) between the pore on smoke pipe and each tube sheet, in said smoke pipe, carry out internal bore welding and be welded to connect, form the circular weld that connects smoke pipe and tube sheet.
2. a kind of welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld according to claim 1 is characterized in that: after step (3), carry out step (4) and angle welding is carried out in the outside of the outer end of smoke pipe and pore be welded to connect.
3. a kind of welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld according to claim 2; It is characterized in that: when carrying out step (2); The outer end of smoke pipe is passed pore, and step (4) is between the outer end of smoke pipe and the pore outside, to carry out angle welding to be welded to connect.
4. a kind of welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld according to claim 2; It is characterized in that: when carrying out step (2); The outer end of smoke pipe is arranged in the pore, and step (4) is between the end of the outer end of smoke pipe and pore inner surface, to adopt angle welding to be welded to connect.
5. a kind of welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld according to claim 1; It is characterized in that: the end of smoke pipe and the inner end inner surface of pore all are provided with forming V-shape or U-shaped groove in the preceding elder generation of step (2); When carrying out step (2); The end of smoke pipe is inserted in the pore, and smoke pipe in the step (3) and pore are to carry out internal bore welding at the groove place to be welded to connect.
6. a kind of welding method that adopts internal bore welding welding Boiler smoke tube and tube sheet attachment weld according to claim 1; It is characterized in that: V-butt all is arranged in the end of smoke pipe and the inner end end face of pore in the preceding elder generation of step (2); When carrying out step (2); The end of smoke pipe is connected with the tube sheet butt joint, and smoke pipe in the step (3) and pore are to be welded to connect through internal bore welding at the groove place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102681598A CN102357707A (en) | 2011-09-13 | 2011-09-13 | Welding method for connecting welding joint of boiler smoke pipe and pipe plates by adopting internal bore welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102681598A CN102357707A (en) | 2011-09-13 | 2011-09-13 | Welding method for connecting welding joint of boiler smoke pipe and pipe plates by adopting internal bore welding |
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| Publication Number | Publication Date |
|---|---|
| CN102357707A true CN102357707A (en) | 2012-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102681598A Pending CN102357707A (en) | 2011-09-13 | 2011-09-13 | Welding method for connecting welding joint of boiler smoke pipe and pipe plates by adopting internal bore welding |
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| Country | Link |
|---|---|
| CN (1) | CN102357707A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107520548A (en) * | 2017-10-10 | 2017-12-29 | 四川蓝星机械有限公司 | A kind of assembly welding method taken over housing for emplacement type structure |
| CN114054899A (en) * | 2021-11-09 | 2022-02-18 | 江苏双良锅炉有限公司 | Welding process of smoke tube and boiler shell of boiler shell boiler |
| CN114453706A (en) * | 2022-03-08 | 2022-05-10 | 常州市乐萌压力容器有限公司 | Crystallizer driving shaft welding process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3440391A (en) * | 1966-07-11 | 1969-04-22 | Foster Wheeler Corp | Internal tube welding |
| GB1172593A (en) * | 1966-03-04 | 1969-12-03 | Foster Wheeler Corp | Bore Welding in Enlarged Bore |
| CN1792532A (en) * | 2005-12-31 | 2006-06-28 | 天脊煤化工集团有限公司 | Method for welding inner hole of heat exchanger |
| CN101628354A (en) * | 2009-08-18 | 2010-01-20 | 四川蓝星机械有限公司 | Bore welding method of heat exchange tube and tube plate in heat exchanger |
-
2011
- 2011-09-13 CN CN2011102681598A patent/CN102357707A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1172593A (en) * | 1966-03-04 | 1969-12-03 | Foster Wheeler Corp | Bore Welding in Enlarged Bore |
| US3440391A (en) * | 1966-07-11 | 1969-04-22 | Foster Wheeler Corp | Internal tube welding |
| CN1792532A (en) * | 2005-12-31 | 2006-06-28 | 天脊煤化工集团有限公司 | Method for welding inner hole of heat exchanger |
| CN101628354A (en) * | 2009-08-18 | 2010-01-20 | 四川蓝星机械有限公司 | Bore welding method of heat exchange tube and tube plate in heat exchanger |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107520548A (en) * | 2017-10-10 | 2017-12-29 | 四川蓝星机械有限公司 | A kind of assembly welding method taken over housing for emplacement type structure |
| CN114054899A (en) * | 2021-11-09 | 2022-02-18 | 江苏双良锅炉有限公司 | Welding process of smoke tube and boiler shell of boiler shell boiler |
| CN114453706A (en) * | 2022-03-08 | 2022-05-10 | 常州市乐萌压力容器有限公司 | Crystallizer driving shaft welding process |
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Application publication date: 20120222 |