CN100404185C - Method for welding inner hole of heat exchanger - Google Patents
Method for welding inner hole of heat exchanger Download PDFInfo
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- CN100404185C CN100404185C CNB2005100482768A CN200510048276A CN100404185C CN 100404185 C CN100404185 C CN 100404185C CN B2005100482768 A CNB2005100482768 A CN B2005100482768A CN 200510048276 A CN200510048276 A CN 200510048276A CN 100404185 C CN100404185 C CN 100404185C
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Abstract
The present invention relates to a welding method of inner holes of heat exchangers. A circular hole is processed on a pipe plate of the heat exchanger; ring-shaped grooves are processed around the circular hole on the welding end of the inner hole of the pipe plate as stress release grooves; a ring-shaped boss is formed between the circular hole and the ring-shaped grooves; a heat exchange pipe and the ring-shaped boss are butted together; an argon arc welding gun is inserted in the heat exchange pipe, and carries out inner hole weld by argon arc welding to a seam part. The ring-shaped grooves are processed on the pipe plate around each root of the heat exchange pipe as the stress release grooves. During weld, the generated stress is easy to release for reducing the welding stress. The heat-up speed of the ring-shaped boss is basically approximated to the heat-up speed of the heat exchange pipe for effectively ensuring welding quality and increasing the service life of the heat exchanger.
Description
Technical field
The present invention relates to a kind of welding method, this welding method is suitable for the heat exchanger tube and the welding of the argon arc welding between the tube sheet of heat exchanger.
Background technology
Common welding method between the heat exchanger tube of heat exchanger and the tube sheet is the outside at tube sheet, and heat exchanger tube and tube sheet that the method for employing argon arc welding will be passed tube sheet weld together, and belong to the angle welding form.This welding method when processing medium flows into heat exchanger tube, can directly be washed away weld seam.
The low pressure reaction water condenser is the visual plant that is used to produce nitric acid, and its effect is with the condensate liquid rapid condensation in the oxidation nitrogen.The tube side medium of heat exchanger is oxidation nitrogen (moderate harm), and the shell side medium is a condensed water.Because low pressure reaction water condenser work under bad environment, variations in temperature is big, and the erosion corrosion of tube side medium butt welded seam is serious, so, be not suitable for adopting the heat exchanger tube and the tube sheet of common welding method welding equipment process gas arrival end.
Bore welding method is that special welding gun is inserted in the heat exchanger tube, and the method that adopts no welding wire argonaut welding to connect welds heat exchanger tube and tube sheet, belongs to the butt weld form.Bore welding method can avoid processing medium directly to wash away weld seam, is bearing alternate stress and is preventing that liquid all is better than traditional common welding manner aspect washing away.
Japan adopts bore welding method to be applied to welding between low pressure reaction water condenser upper inlet end heat exchanger tube and the tube sheet in the eighties the earliest, its welding method is to have bored earlier the diameter circular hole identical with the heat exchanger tube internal diameter on tube sheet, internal bore welding end in tube sheet processes the concave station that a diameter is equivalent to the heat exchanger external diameter again, during welding heat exchanger tube is inserted in the concave station, argon-arc welding gun inserts pore and welds.
Though this bore welding method tube sheet processing is simple, heat exchanger tube can insert in the concave station during welding, and heat exchanger tube is convenient with docking of tube sheet, also has weak point, at first is that the stress after the welding can not discharge; Secondly, tube sheet heats up slowlyer than heat exchanger tube during welding, influences welding quality; Simultaneously, because weld seam is positioned at the inside of tube sheet, also be inconvenient to observe the quality quality of welding after the welding.
Summary of the invention
The bore welding method that the purpose of this invention is to provide a kind of heat exchanger to reduce welding stress, guarantees welding quality, thereby improves the service life of heat exchanger.
Heat exchanger bore welding method of the present invention comprises:
On the tube sheet of heat exchanger, process circular hole;
Internal bore welding end on tube sheet, makes to constitute an annular boss between circular hole and the annular groove as stress relief grooves around each circular hole processing annular groove;
Annular boss on heat exchanger tube and the tube sheet is docking together;
Argon-arc welding gun is inserted in the heat exchanger tube, and the abutment joint place carries out the welding of argon arc welding endoporus.
Wherein, the Circularhole diameter of processing on the heat exchanger tube sheet is identical with the internal diameter of heat exchanger tube, and the internal diameter of annular groove is not less than the external diameter of heat exchanger tube.
More preferably, the internal diameter of annular groove equates that with the external diameter of heat exchanger tube at this moment, the thickness of annular boss is identical with the pipe thickness of heat exchanger tube.
The present invention is owing to process annular groove as stress relief grooves on the tube sheet around the every heat exchanger tube, the stress that produces during welding is easy to discharge, thereby reduced welding stress, simultaneously, the annular boss programming rate when welding on the tube sheet and the programming rate of heat exchanger tube are approaching substantially, can effectively guarantee the quality of welding, improve the service life of heat exchanger, have good welding performance, and the weld seam after the welding is positioned at the surface of tube sheet, also is convenient to observe the quality of welding quality.
Except that being used to produce the low pressure reaction water condenser of nitric acid, other has the relatively poor heat exchanger of working condition that variations in temperature is big, produce characteristics such as alternate stress, butt welded seam erosion corrosion be serious, can use bore welding method of the present invention to make the service life that effectively to improve heat exchanger.
Description of drawings
Fig. 1 is the schematic diagram of bore welding method of the present invention.
The specific embodiment
The low pressure reaction water condenser is a visual plant of producing nitric acid, and this equipment is shell-and-tube heat exchanger, length overall 14.6m, and tube sheet diameter phi 2124mm is evenly equipped with 2020 heat exchanger tubes on the tube sheet, equipment heat exchange area 1798m
2, net weight 48055Kg.
When making the low pressure reaction water condenser, at first process the inner body of condensers such as comprising tube sheet, heat exchanger tube, deflection plate, pull bar, comprise the blanking of shell ring again and roll and shell ring between group to operations such as welding, produce the cylindrical shell of heat exchanger, then heat exchanger tube is restrained and is worn in assembling, tube bank is penetrated in the heat exchanger cylindrical shell, preparation is docked with tube sheet and is carried out the endoporus welding again.
Bore welding method such as Fig. 1 of low pressure reaction water condenser process gas arrival end tube sheet 2 and heat exchanger tube 4, at first getting out 2020 apertures on tube sheet 2 is φ 21.4
0 + 0.05The circular hole of mm (identical) with the internal diameter of heat exchanger tube 4, then each circular hole of internal bore welding end that is connected with heat exchanger tube 4 at tube sheet 2 all processes the annular groove 6 of a φ 29.4mm as stress relief grooves on every side, the groove width 3mm of annular groove 6, groove depth 3mm, thereby form an annular boss between circular hole and annular groove 6, the width of annular boss is identical with the pipe thickness of heat exchanger tube 4.During welding, with the annular boss that heat exchanger tube 4 is aimed on the tube sheet 2, argon-arc welding gun 1 inserts in the tube sheet 2, and tungsten electrode 3 is aimed at the junction of tube sheet 2 and heat exchanger tube 4, adopts the two-sided argon shield argonaut welding of no welding wire to weld.Weld seam 5 after the welding carries out single local 0.54MPa hydrostatic test immediately, to guarantee the endoporus welding quality of every heat exchanger tube 4.
Then adopt common welding method again, the other end and the heat exchanger exit end tube sheet of heat exchanger tube 4 welded together, and the subsides of carrying out heat exchanger tube expand, make and weld bobbin carriage at last.
After the low pressure reaction water condenser is made, according to designing requirement, respectively the equipment shell side is carried out the 0.58MPa water pressure test according to the GB150-1998 standard, tube side is carried out the 0.54MPa water pressure test, qualification rate reaches 100%; According to the HG20584-98 standard shell side is carried out 1% ammonia leak test of 0.48MPa, qualification rate 100%.
Any abnormal problem is not found in the operation of putting into production after the new low pressure reaction water condenser of making was installed on January 13rd, 2005 so far.
Claims (4)
1. the bore welding method of a heat exchanger comprises:
On the tube sheet of heat exchanger, process circular hole;
Internal bore welding end on tube sheet around each circular hole processing annular groove, makes to constitute an annular boss between circular hole and the annular groove;
Annular boss on heat exchanger tube and the tube sheet is docking together;
Argon-arc welding gun is inserted in the heat exchanger tube, and the abutment joint place carries out the welding of argon arc welding endoporus.
2. heat exchanger bore welding method according to claim 1 is characterized in that the diameter of processing circular hole on heat exchanger tube sheet is identical with the internal diameter of heat exchanger tube.
3. heat exchanger bore welding method according to claim 1 and 2 is characterized in that the internal diameter of annular groove is not less than the external diameter of heat exchanger tube.
4. heat exchanger tube bore welding method according to claim 3 is characterized in that the internal diameter of annular groove equals the external diameter of heat exchanger tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100482768A CN100404185C (en) | 2005-12-31 | 2005-12-31 | Method for welding inner hole of heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100482768A CN100404185C (en) | 2005-12-31 | 2005-12-31 | Method for welding inner hole of heat exchanger |
Publications (2)
| Publication Number | Publication Date |
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| CN1792532A CN1792532A (en) | 2006-06-28 |
| CN100404185C true CN100404185C (en) | 2008-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100482768A Active CN100404185C (en) | 2005-12-31 | 2005-12-31 | Method for welding inner hole of heat exchanger |
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| CN (1) | CN100404185C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608876B (en) * | 2009-07-01 | 2010-10-27 | 南通三圣石墨设备科技有限公司 | Assembling method of vertical tube-type graphite heat exchanger |
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| CN101745721A (en) * | 2008-12-09 | 2010-06-23 | 上海一诺仪表有限公司 | Welding method of damper plate and flow tube in Coriolis mass flowmeter |
| CN102288062B (en) * | 2011-07-20 | 2013-02-13 | 牛鸿宾 | Sealed pipe plate for heat exchanger |
| 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 |
| CN102501034B (en) * | 2011-12-30 | 2015-01-14 | 无锡信大气象传感网科技有限公司 | Processing technology of outer conductor made of ferrite nodules |
| CN102513668B (en) * | 2011-12-31 | 2014-04-09 | 茂名重力石化机械制造有限公司 | Welding gun head for inner hole of sharp quenching heat exchanger |
| CN103769726A (en) * | 2014-02-14 | 2014-05-07 | 中国船舶重工集团公司第七�三研究所 | Tube and tube plate welding structure capable of reducing residual stress |
| CN104359333B (en) * | 2014-11-07 | 2017-02-01 | 张家港市江南锅炉压力容器有限公司 | Gas-gas heat exchanger |
| CN105115319A (en) * | 2015-09-28 | 2015-12-02 | 江阴中南重工有限公司 | Reaction water cooler |
| CN105269122A (en) * | 2015-11-23 | 2016-01-27 | 上海电气电站设备有限公司 | Inner bore automatic welding method for snake-shaped high-pressure heater header and extension section |
| 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 |
| CN107999933A (en) * | 2017-12-26 | 2018-05-08 | 哈尔滨锅炉厂有限责任公司 | Fountain type stringing inner hole welding of rapid cooling structure and welding method |
| CN111037065B (en) * | 2019-12-31 | 2021-09-24 | 中国科学院上海应用物理研究所 | Welding method for inner hole welding of tube plate of small-aperture heat exchange tube |
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| US4535214A (en) * | 1983-08-26 | 1985-08-13 | Nooter Corporation | Method and apparatus for joining a tube to a tubesheet |
| JPH05118774A (en) * | 1991-10-23 | 1993-05-14 | Matsushita Refrig Co Ltd | Laminated heat exchanger |
| JPH0835789A (en) * | 1994-07-21 | 1996-02-06 | Chiyoda Corp | Heat-exchanger and method for sealing its tube plate and heat-transfer pipe |
| CN1153690A (en) * | 1996-01-05 | 1997-07-09 | 黄月义 | Welding method and material for the welding between the pipe with infiltrated metal layer and the plate |
| CN2276393Y (en) * | 1996-10-16 | 1998-03-18 | 中国科学院金属研究所 | Tube sheet circular seam welding fixture |
| US6552294B1 (en) * | 2001-10-02 | 2003-04-22 | Delphi Technologies, Inc. | Method for metallurgically attaching together two members |
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2005
- 2005-12-31 CN CNB2005100482768A patent/CN100404185C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4535214A (en) * | 1983-08-26 | 1985-08-13 | Nooter Corporation | Method and apparatus for joining a tube to a tubesheet |
| JPH05118774A (en) * | 1991-10-23 | 1993-05-14 | Matsushita Refrig Co Ltd | Laminated heat exchanger |
| JPH0835789A (en) * | 1994-07-21 | 1996-02-06 | Chiyoda Corp | Heat-exchanger and method for sealing its tube plate and heat-transfer pipe |
| CN1153690A (en) * | 1996-01-05 | 1997-07-09 | 黄月义 | Welding method and material for the welding between the pipe with infiltrated metal layer and the plate |
| CN2276393Y (en) * | 1996-10-16 | 1998-03-18 | 中国科学院金属研究所 | Tube sheet circular seam welding fixture |
| US6552294B1 (en) * | 2001-10-02 | 2003-04-22 | Delphi Technologies, Inc. | Method for metallurgically attaching together two members |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608876B (en) * | 2009-07-01 | 2010-10-27 | 南通三圣石墨设备科技有限公司 | Assembling method of vertical tube-type graphite heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1792532A (en) | 2006-06-28 |
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Address after: 047500 Zhonghua East Street, Lucheng City, Changzhi City, Shanxi Province Patentee after: TIANJI COAL CHEMICAL INDUSTRY GROUP Co.,Ltd. Address before: 047507 Shanxi Lucheng city of East Street Tianji coal chemical industry group limited company chief engineer office Patentee before: TIANJI COAL CHEMICAL GROUP Co.,Ltd. |
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Effective date of registration: 20211123 Address after: 047500 Zhonghua East Street, Lucheng City, Changzhi City, Shanxi Province Patentee after: TIANJI COAL CHEMICAL INDUSTRY GROUP Co.,Ltd. Patentee after: Shanxi Lu'an Tianji mechanical equipment manufacturing Co.,Ltd. Address before: 047500 Zhonghua East Street, Lucheng City, Changzhi City, Shanxi Province Patentee before: TIANJI COAL CHEMICAL INDUSTRY GROUP Co.,Ltd. |
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