CN101628354A - Bore welding method of heat exchange tube and tube plate in heat exchanger - Google Patents
Bore welding method of heat exchange tube and tube plate in heat exchanger Download PDFInfo
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- CN101628354A CN101628354A CN200910305748A CN200910305748A CN101628354A CN 101628354 A CN101628354 A CN 101628354A CN 200910305748 A CN200910305748 A CN 200910305748A CN 200910305748 A CN200910305748 A CN 200910305748A CN 101628354 A CN101628354 A CN 101628354A
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Abstract
The invention discloses a bore welding method of a heat exchange tube and a tube plate in a heat exchanger, comprising the following steps: processing a circular hole (2) on the tube plate (1), overlapping the welding end of the heat exchange tube (3) on the circular hole (2) of the tube plate (1) during the welding process, performing bore welding at the joint, and inserting the welding end of the heat exchange tube (3) into the circular hole (2) by 0.3-1.8 mm, wherein the diameter of the circular hole (2) on the tube plate (1) is 0.1-0.3 mm larger than the external diameter of the heat exchange tube (3). By welding the heat exchange tube and the tube plate with the method, the invention improves the welding quality and effectively avoids crevice corrosion and deposit fluid corrosion after welding. The bore welding method of a heat exchange tube and a tube plate in a heat exchanger has simple technological operation and excellent welding performance, greatly improves the quality of the heat exchanger and prolongs the service life.
Description
Technical field
The present invention relates to a kind of welding method, the bore welding method of heat exchanger tube and tube sheet in especially a kind of heat exchanger.
Background technology
Heat exchanger is the widely used equipment of industry such as petrochemical industry, and wherein the welding of heat exchanger tube and tube sheet is the important procedure during heat exchanger is made, so the welding quality quality of heat exchanger tube and tube sheet is directly determining the quality good or not and the service life of heat exchanger.
The heat exchanger tube in traditional heat exchanger and the welding of tube sheet are mainly adopted corner connection version as shown in Figure 1, are about to heat exchanger tube and penetrate into the front end welding of tube sheet and form angle welding, comprise fillet weld in the flat position, stretch out angle welding and three kinds of joint forms of inside fillet.This welding method is owing to exist the gap between heat exchanger tube and the tube sheet, and weld seam is subjected to the positive souring of high temperature corrosion fluid, so weld seam is easy to corrosion cracking, thereby causes the service life of equipment not high.
For fear of directly washing away of processing medium butt welded seam, reduce the destruction that high temperature corrosion fluid heat exchanging tube and tube plate welding seams causes, people begin to change traditional welding manner, preferably adopt bore welding method to come heat exchanging tube and tube plate to weld.In the patent of invention CN 100404185C of bulletin on July 23rd, 2008, disclosed a kind of bore welding method of heat exchanger, as shown in Figure 2, this method is processed circular hole earlier on the tube sheet of heat exchanger, internal bore welding end at tube sheet processes annular groove again, make to constitute an annular boss between circular hole and the groove, the annular boss on the tube-to-tube sheet connection is docking together carries out the endoporus welding at last.But this welding method is because the existence of annular groove on the tube sheet causes the corrosive liquid in the annular groove to circulate with the shell side medium, so very easily form the hydrops corrosion, destroys weld seam and makes it be difficult to repair.
Summary of the invention
Technical problem to be solved by this invention provides a kind of bore welding method that can avoid the weld seam of heat exchanger tube and tube sheet in the heat exchanging device to cause crevice corrosion and hydrops corrosion.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: the bore welding method of heat exchanger tube and tube sheet in a kind of heat exchanger, earlier process circular hole on tube sheet, the welding ends with heat exchanger tube during welding is overlapped on the circular hole of tube sheet, and its seam crossing is carried out the endoporus welding.
Described heat exchanger tube is overlapped on the welding ends that requires heat exchanger tube on the circular hole and stretches into 0.3～1.8mm in the circular hole.
Described heat exchanger tube is overlapped on the welding ends that requires heat exchanger tube on the circular hole and stretches into 1.0mm in the circular hole.
The diameter of the described circular hole that processes on tube sheet is than the big 0.1～0.3mm of external diameter of heat exchanger tube.
The diameter of the described circular hole that processes on tube sheet is than the big 0.15mm of external diameter of heat exchanger tube.
The bore welding method of heat exchanger tube and tube sheet in the heat exchanger of the present invention, welding ends with heat exchanger tube when promptly welding is overlapped on the circular hole of tube sheet, with welding gun its seam crossing is carried out the endoporus welding again, heat exchanger tube just only need be overlapped on the near-end edge of tube sheet circular hole like this, and need not to stretch in a large number in the circular hole on the tube sheet, thereby just can there be the gap in welding back heat exchanger tube and tube sheet circular hole, have therefore avoided the crevice corrosion problem in the traditional welding method; Simultaneously, this bridging arrangement form in this welding method need not to be provided with around the weld seam annular groove to eliminate welding stress, has also avoided the hydrops corrosion of the butt welded seam that caused by annular groove.
The bore welding method of heat exchanger tube and tube sheet in the heat exchanger of the present invention, technological requirement according to welding, the welding ends of heat exchanger tube must be stretched into 0.3～1.8mm in the circular hole, require the external diameter big 0.1～0.3mm of the diameter of the circular hole that processes on the tube sheet simultaneously, to guarantee the welding performance of heat exchanger tube and tube sheet than heat exchanger tube.Calculate and operating experience according to theory, the welding ends of heat exchanger tube stretches into circular hole length and is set to 1.08mm, and the Circularhole diameter on the tube sheet is processed as the big 0.15mm of external diameter than heat exchanger tube, can obtain preferable technological effect after the welding.
To sum up, the bore welding method of heat exchanger tube and tube sheet in the heat exchanger of the present invention, technological operation is simple, and welding performance is good, has improved the product quality and the service life of heat exchanger greatly.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the conventional angular soldering method schematic diagram of heat exchanger tube and tube sheet.
Fig. 2 is a schematic diagram of offering the bore welding method of annular groove on the tube sheet of heat exchanger.
Location schematic diagram when Fig. 3 is the endoporus welding of heat exchanger tube and tube sheet in the heat exchanger of the present invention.
Fig. 4 is the structural representation after the endoporus welding of heat exchanger tube and tube sheet in the heat exchanger of the present invention.
Wherein, Reference numeral: 1 is the tube sheet in the heat exchanger, and 2 is the circular hole on the tube sheet, and 3 is the heat exchanger tube in the heat exchanger, and 4 is positioning tool, and 5 is the hole inside weld, and 6 is the hole outside weld.
The specific embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
As depicted in figs. 1 and 2, the bore welding method of heat exchanger tube and tube sheet in the heat exchanger of the present invention processes circular hole 2 earlier on tube sheet 1, require the external diameter big 0.1～0.3mm of the diameter of circular hole 2 than heat exchanger tube 3, is designed to 0.15mm here; Welding ends with heat exchanger tube 3 is overlapped on the circular hole 2 of tube sheet 1 again, require the welding ends of heat exchanger tube 3 to stretch into 0.3～1.8mm in the circular hole 2, adopt positioning tool 4 assist location with the stretch into amount of control heat exchanger tube 3 in circular hole 2 during overlap joint, here the welding ends of setting heat exchanger tube 3 stretches into that length values are 1.0mm in the circular hole 2, have good positioning back employing electric welding mode at 3 points of seam crossing welding, in case fastening position frock 4 is taken out back heat exchanger tube 3 and tube sheet 1 relative displacements; Use pipe/plate endoporus welding gun to stretch at last to carry out in the circular hole 2 of tube sheet 1 welding with formation hole inside weld 5 in the hole in, hole outside weld 6 free formings, the while hole is outside equipped with the inert gas shielding device, so that seam organization is near mother metal and guarantee its mechanical performance.After the welding in time butt welded seam detect, guarantee the endoporus welding quality.
The present invention is not limited to the aforesaid specific embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (5)
1. the bore welding method of heat exchanger tube and tube sheet in the heat exchanger processes circular hole (2) earlier on tube sheet (1), and it is characterized in that: the welding ends with heat exchanger tube (3) during welding is overlapped on the circular hole (2) of tube sheet (1), and its seam crossing is carried out the endoporus welding.
2. the bore welding method of heat exchanger tube according to claim 1 and tube sheet is characterized in that: described heat exchanger tube (3) is overlapped on the welding ends that requires heat exchanger tube (3) on the circular hole (2) and stretches into 0.3～1.8mm in the circular hole (2).
3. the bore welding method of heat exchanger tube according to claim 1 and 2 and tube sheet is characterized in that: described heat exchanger tube (3) is overlapped on the welding ends that requires heat exchanger tube (3) on the circular hole (2) and stretches into the interior 1.0mm of circular hole (2).
4. the bore welding method of heat exchanger tube according to claim 1 and tube sheet is characterized in that: the diameter of the described circular hole (2) that processes on tube sheet (1) is than the big 0.1～0.3mm of external diameter of heat exchanger tube (3).
5. according to the bore welding method of claim 1 or 4 described heat exchanger tubes and tube sheet, it is characterized in that: the diameter of the described circular hole (2) that processes on tube sheet (1) is than the big 0.15mm of external diameter of heat exchanger tube (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910305748 CN101628354B (en) | 2009-08-18 | 2009-08-18 | Bore welding method of heat exchange tube and tube plate in heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910305748 CN101628354B (en) | 2009-08-18 | 2009-08-18 | Bore welding method of heat exchange tube and tube plate in heat exchanger |
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| CN101628354A true CN101628354A (en) | 2010-01-20 |
| CN101628354B CN101628354B (en) | 2011-08-10 |
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| CN 200910305748 Active CN101628354B (en) | 2009-08-18 | 2009-08-18 | Bore welding method of heat exchange tube and tube plate in heat exchanger |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357707A (en) * | 2011-09-13 | 2012-02-22 | 浙江特富锅炉有限公司 | Welding method for connecting welding joint of boiler smoke pipe and pipe plates by adopting internal bore welding |
| CN105710549A (en) * | 2016-02-06 | 2016-06-29 | 保定多田冷却设备有限公司 | Technology of welding stainless steel cooling pipe and pipe plate of air cooler for transformer |
| CN108480824A (en) * | 2018-03-06 | 2018-09-04 | 兰州兰石重型装备股份有限公司 | Heat exchanger tube sheet and heat exchange pipe orifice overlap joint welding method |
| CN110303278A (en) * | 2019-07-08 | 2019-10-08 | 四川科新机电股份有限公司 | A kind of the group to point mounted welder and group to point soldering method of tube-tube plate internal bore welding |
| CN110773897A (en) * | 2019-11-25 | 2020-02-11 | 南京扬子检修安装有限责任公司 | Tube plate and heat exchange tube shrinkage welding process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19505532A1 (en) * | 1995-02-18 | 1996-08-22 | Balcke Duerr Ag | Process for the gap-free welding of the ends of thin-walled heat exchanger tubes |
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2009
- 2009-08-18 CN CN 200910305748 patent/CN101628354B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357707A (en) * | 2011-09-13 | 2012-02-22 | 浙江特富锅炉有限公司 | Welding method for connecting welding joint of boiler smoke pipe and pipe plates by adopting internal bore welding |
| CN105710549A (en) * | 2016-02-06 | 2016-06-29 | 保定多田冷却设备有限公司 | Technology of welding stainless steel cooling pipe and pipe plate of air cooler for transformer |
| CN105710549B (en) * | 2016-02-06 | 2018-05-01 | 保定多田冷却设备有限公司 | A kind of transformer forced air cooler stainless steel cooling pipe and Tube-sheet Welding technique |
| CN108480824A (en) * | 2018-03-06 | 2018-09-04 | 兰州兰石重型装备股份有限公司 | Heat exchanger tube sheet and heat exchange pipe orifice overlap joint welding method |
| CN110303278A (en) * | 2019-07-08 | 2019-10-08 | 四川科新机电股份有限公司 | A kind of the group to point mounted welder and group to point soldering method of tube-tube plate internal bore welding |
| CN110303278B (en) * | 2019-07-08 | 2021-05-25 | 四川科新机电股份有限公司 | Assembly spot welding tool and assembly spot welding method for hole welding in pipe plate |
| CN110773897A (en) * | 2019-11-25 | 2020-02-11 | 南京扬子检修安装有限责任公司 | Tube plate and heat exchange tube shrinkage welding process |
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| CN101628354B (en) | 2011-08-10 |
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Inventor after: Zhang Zeshun Inventor after: Peng Dazhou Inventor after: Mei Qi Inventor after: Luo Hualin Inventor after: Liu Daifu Inventor after: Zhang Jiyun Inventor after: Luo Xiaocheng Inventor after: Xiang Shirong Inventor after: Li Hua Inventor after: Guo Zhizuo Inventor before: Liu Daifu Inventor before: Zhang Jiyun Inventor before: Luo Xiaocheng Inventor before: Xiang Shirong |
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Free format text: CORRECT: INVENTOR; FROM: LIU DAIFU ZHANG JIYUN LUO XIAOCHENG XIANG SHIRONG TO: ZHANG ZESHUN MEI QI LUO HUALIN LIU DAIFU ZHANG JIYUN LUO XIAOCHENG XIANG SHIRONG LI HUA GUO ZHIZUO PENG DAZHOU |
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