CN201799751U - Welding structure adopting expansion after welding for heat exchange pipe and pipe sheet - Google Patents
Welding structure adopting expansion after welding for heat exchange pipe and pipe sheet Download PDFInfo
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- CN201799751U CN201799751U CN2010202884697U CN201020288469U CN201799751U CN 201799751 U CN201799751 U CN 201799751U CN 2010202884697 U CN2010202884697 U CN 2010202884697U CN 201020288469 U CN201020288469 U CN 201020288469U CN 201799751 U CN201799751 U CN 201799751U
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- welding
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- exchanger tube
- tube
- heat exchange
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Abstract
The utility model provides a welding structure adopting expansion after welding for a heat exchange pipe and a pipe sheet. The welding structure comprises the heat exchange pipe, the pipe sheet and a copper bush, wherein the copper bush is movably arranged in the heat exchange pipe, the heat exchange pipe extends into a hole of the pipe sheet, a welding bevel is arranged on the pipe sheet, the front end of the heat exchange pipe corresponds to the welding bevel in position, and the outer wall of the copper bush is arranged on the inner side of the front end of the heat exchange pipe corresponding to the welding bevel in position. The welding structure effectively solves the problem that the inner drift diameter at the welding line is reduced after the heat exchange pipe is welded with a pipe sheet welding joint, avoids welding defects (such as poor surface quality caused by gas injection, incomplete penetration in an arc-ending position, etc), realizes the expansion after welding processing technique, improves the production efficiency by 50 percent, effectively guarantees the surface quality of the welding line, and increases the post-welding detection yield up to 98 percent.
Description
Technical field
The utility model relates to the joint of heat exchanger tube and tube sheet in the heat exchanger, when adopting the automatic tungsten anode argon arc welding welding, be a kind of process structure that prevents that heat exchanger tube and tube sheet joint weld seam from subsiding and causing heat exchanger tube endoporus effective drift diameter to reduce, and particularly a kind of heat exchanger tube and the bloated Welding Structure of tube sheet elder generation postwelding.
Background technology
The syndeton of tube-to-tube sheet connection and quality control are crucial structure and links during heat exchanger is made.Heat exchanger tube and tube sheet are the unique barriers between heat exchanger tube side and the shell side, so the good ring of heat exchanger tube and tube sheet jointing quality is the shell-and-tube heat exchanger topmost factor that lost efficacy; According to the service condition difference of heat exchanger, heat exchanger tube sheet and pipe jointing pattern are divided into expanded joint, welding, expanded joint and add welding.
The general method of attachment of adopting expanded joint+welding.When adopting welding to add expanded joint, be divided into the first postwelding back welding process method that expands, expands earlier.
Expand earlier and afterwards weld manufacturing process the clean-up performance of pipe and tube sheet is had relatively high expectations, otherwise impurity such as gas moisture very easily causes weld defect when welding during welding, the difficult eliminating of the gas of generation when welding simultaneously influences appearance of weld, welding quality and production efficiency; When the back welder's skill that expands was earlier carried out the tube head connection, welding had adverse effect to expanded joint, easily causes the expanded joint position loose, influences the tube head quality of connection.
Elder generation's postwelding expands and can fundamentally avoid this situation to take place.After elder generation's postwelding expands (heat exchanger and tube sheet joint form such as Fig. 4), heat exchanger tube and pipe sheet weld joint all are to weld in the 5FG position, subsiding appears in joint welding top, cause heat exchange pipe and tube sheet joint internal diameter to dwindle, when heat exchange internal diameter of pipe joint and casing roller expansion head diameter difference during greater than 0.6mm, under the situation of not carrying out the reconditioning of tube head weld seam endoporus, flexible tube expander can not insert in the heat exchanger tube, can't implement the postwelding expanded joint.After taking all factors into consideration, prior art generally still adopts the process that expands and afterwards weld earlier.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the utility model proposes the Welding Structure that a kind of heat exchanger tube and tube sheet elder generation postwelding expands, its role is to, utilize the red copper cover to force cooling and moulding effect during welding, the effective drift diameter of tube sheet joint endoporus is controlled in the margin of tolerance of permission, so that when heat exchanger tube and tube sheet joint postwelding adopt the liquid bag to carry out expanded joint, the head that guarantees to expand puts in heat exchanger tube and carries out the heat exchanger tube expanded joint, thereby has realized the first postwelding technology that expands easily.Concrete technical scheme is as follows:
The Welding Structure that a kind of heat exchanger tube and tube sheet elder generation postwelding expand comprises heat exchanger tube, tube sheet and copper sheathing.Wherein, copper sheathing is movably set in the heat exchanger tube.Heat exchanger tube stretches in the hole of tube sheet.Tube sheet is provided with bevel for welding, and the front end of heat exchanger tube is corresponding with the bevel for welding position.Copper sheathing outer wall pad is in the inboard of the front end of the heat exchanger tube corresponding with the bevel for welding position.
In the utility model, the material of described copper sheathing is T2.
In the utility model, described copper sheathing is a tubular construction, and the gap between the external diameter of copper sheathing and the heat exchanger tube internal diameter is not more than 0.4mm.
In the utility model, the precision of described copper sheathing is combined into (D-2 δ)
-0.05 -0.40, wherein D is that heat exchanger tube external diameter, δ are the heat exchanger tube wall thickness, size is mm.
In the utility model, the front end angulation of described bevel for welding and heat exchanger tube is 45 °.
In the utility model, it is 0～1.5mm that the front end of described heat exchanger tube stretches out bevel for welding length.
The use principle of this device is, the copper sheathing size of employing on the core bar of the location of automatic tungsten anode argon arc welding increases the process unit of machining tolerance, utilize copper sheathing pressure moulding and cooling effect in the welding process, heat exchanger tube endoporus latus rectum is controlled in the scope of tube expander expanded joint requirement, under the situation of not reconditioning endoporus weld seam, realize adopting flexible expanded joint method to carry out heat exchanger tube and the bloated processing technology of tube sheet elder generation postwelding.
Heat exchanger tube and tube sheet joint are because the restriction of produced on-site condition, weld seam is in the 5FG position during welding, subside (the extension knurl) of joint welding the first half is difficult to avoid, heat exchanger tube and tube sheet joint copper sheathing on free state welding or automatic tungsten anode argon arc welding core bar does not carry out tolerance control, and the endoporus effective drift diameter of heat exchanger tube and tube sheet joint will be difficult to control reach and adopt flexible expanding joint process method to realize that first welded and rolled tube joint connects technology.By tube sheet joint heat exchanger tube internal diameter effective drift diameter and casing roller expansion header structure are studied, expand a diameter and the heat exchanger tube internal diameter diameter deviation of finding tube expander is during less than 0.6mm, can be under the situation of not reconditioning of postwelding heat exchanger tube and tube sheet joint, adopt flexible expanding joint method to realize the first postwelding technology that expands.According to bloated technological requirement of first postwelding and automatic tungsten anode argon arc welding core bar structure characteristics, core bar copper sheathing machining accuracy is controlled according to the interior diameter of heat exchanger tube, promptly adopting processing dimension is D1
-0.05 -0.20Copper sheathing process unit (concrete fit structure form as shown in Figure 3), when adopting automatic tungsten anode argon arc welding to carry out heat exchanger tube and tube sheet welding, copper sheathing is cooperated installation with core bar, utilize the fast characteristics of copper sheathing heat transfer, the weld metal that heat exchanger tube and panel weld is subsided enter the heat exchanger tube inwall is forced cooling forming, with the clearance control between copper sheathing (material is T2) and the heat exchanger tube internal diameter in the 0.4mm scope, the difference that guarantees flexible casing roller expansion head and heat exchanger tube diameter of bore is controlled at the 0.6mm scope, realizes the bloated processing technology of first postwelding that heat exchanger tube is connected with tube sheet.Quicken the cooling velocity of welding point simultaneously by copper sheathing, improve weldquality.Realize first postwelding expand assemble sequence such as Fig. 2～shown in Figure 4.
By experiment, adopt before the fine finishining copper sheathing 3, welding point for heat exchanger tube and tube sheet, when adopting automatic tungsten anode argon arc welding to carry out heat exchanger tube and tube sheet welding, because weld seam free state moulding, postwelding needs heat exchanging tube and tube plate joint endoporus weld metal the raised area to carry out the reconditioning processing, and head can not put in heat exchanger tube otherwise flexible tube expander (stainless steel and non-ferrous metal generally can not carry out mechanical expanded joint) expands, and can't implement flexible expanded joint.When adopting the back welder of expanding earlier to plant, cleaning is strict before the welding, when welding behind the expanded joint, because the gas in the welding process in heat exchanger tube and the tube sheet groove can not a large amount of gases occur and outwards spray by heat exchanger tube and the discharging of tube sheet gap when arc is received in welding, cause the weld appearance moulding poor, receive the arc place simultaneously and hole (lack of penetration) occurs, need carry out postwelding and close up, postwelding detects qualification rate less than 70% (under the situation that the welder pays special attention to), and the postwelding amount of reprocessing is big.Use this Welding Structure by improving the precision of copper sheathing on the automatic tungsten anode argon arc welding core bar, efficiently solve commissure, heat exchanger tube and pipe sheet weld joint welding back endoporus latus rectum and reduce problem, avoided simultaneously above-mentioned weld defect (as jet cause surface quality bad, receive defectives such as the arc place is lack of penetration) generation, realized the first postwelding processing technology that expands; Enhance productivity 50%, the face of weld quality is guaranteed that effectively postwelding detects qualification rate and reaches 98%.
Description of drawings
Figure 1 shows that copper sheathing (material: dimensional structure schematic diagram T2);
Fig. 2～Figure 4 shows that placement schematic diagram of heat exchanger and pipe sheet weld joint structure and copper sheathing;
Wherein:
Fig. 2 is first postwelding expanded joint heat exchanger tube and tube sheet joint welding assembly structure figure;
Fig. 3 is that first postwelding expands heat exchanger tube when welding with tube sheet joint and copper sheathing assembly structure dimensional drawing;
Fig. 4 is hole dimension and an expanded joint result schematic diagram in the postwelding tube sheet joint;
Among the last figure: the 1-tube sheet; The 2-heat exchanger tube; The 3-T2 copper sheathing; D-heat exchanger tube external diameter (mm); δ-heat exchanger tube wall thickness (mm); T-tube plate thickness (mm); L2-groove depth (mm).
The specific embodiment
For above-mentioned and other purpose, feature and advantage of the present utility model can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
The Welding Structure that a kind of heat exchanger tube and tube sheet elder generation postwelding expand comprises heat exchanger tube 2 and tube sheet 1; Heat exchanger tube 2 stretches in the hole of tube sheet 1; Be provided with bevel for welding on tube sheet 1, the front end of heat exchanger tube 2 is corresponding with the bevel for welding position; Also be movably equipped with copper sheathing 3, copper sheathing 3 is located in the heat exchanger tube 2, and copper sheathing 3 outer wall pads are in the inboard of the front end of the described heat exchanger tube 2 corresponding with the bevel for welding position.
In the utility model, the material of copper sheathing 3 is T2.Copper sheathing 3 is tubular constructions, and the gap between the external diameter of copper sheathing and the heat exchanger tube internal diameter is not more than 0.4mm.The precision of copper sheathing 3 is (D-2 δ)
-0.05 -0.40, wherein D is that heat exchanger tube external diameter, δ are the heat exchanger tube wall thickness, size is mm.The front end angulation of bevel for welding and heat exchanger tube 2 is 45 °.It is 0～1.5mm that the front end of heat exchanger tube 2 stretches out bevel for welding length.
During concrete operations,
1, adopts vernier caliper measurement heat exchanger tube dimensions D * δ (mm);
2, determine the processing dimension and the precision (D-2 δ) of copper sheathing
-0.05 -0.40, establishment copper sheathing processing technology;
3, meet the copper sheathing of tolerance by pattern processing, copper sheathing inspection is met (D-2 δ)
-0.05 -0.40
4, press the installation requirement of automatic tungsten anode argon arc welding core bar, copper sheathing is contained on the core bar, the automatic tungsten anode argon arc welding machine is regulated, copper sheathing should be in heat exchanger tube and panel weld position;
5, carry out the welding of heat exchanger tube and tube sheet joint, postwelding adopts flexible tube expander (stainless steel and non-ferrous metal generally can not carry out mechanical expanded joint) heat exchanging tube and tube plate joint to carry out expanded joint, realizes bloated heat exchanger tube of first postwelding and tube sheet processing technology.
Concrete case study on implementation only is a preferable case study on implementation of the present utility model described in the utility model, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should be as technology category of the present utility model.
Claims (6)
1. the Welding Structure that expands of heat exchanger tube and tube sheet elder generation postwelding comprises heat exchanger tube and tube sheet, it is characterized in that, also comprises copper sheathing; Copper sheathing is movably set in the described heat exchanger tube, heat exchanger tube stretches in the hole of tube sheet, described tube sheet is provided with bevel for welding, and the front end of heat exchanger tube is corresponding with the bevel for welding position, and copper sheathing outer wall pad is in the inboard of the front end of the described heat exchanger tube corresponding with the bevel for welding position.
2. the Welding Structure that heat exchanger tube according to claim 1 and tube sheet elder generation postwelding expand is characterized in that the material of described copper sheathing is T2.
3. the Welding Structure that heat exchanger tube according to claim 1 and 2 and tube sheet elder generation postwelding expand is characterized in that described copper sheathing is a tubular construction, and the gap between the external diameter of copper sheathing and the heat exchanger tube internal diameter is not more than 0.4mm.
4. the Welding Structure that heat exchanger tube according to claim 3 and tube sheet elder generation postwelding expand is characterized in that the precision of described copper sheathing is (D-2 δ)
-0.05 -0.40, wherein D is that heat exchanger tube external diameter, δ are the heat exchanger tube wall thickness, size is mm.
5. the Welding Structure that heat exchanger tube according to claim 1 and tube sheet elder generation postwelding expand is characterized in that the front end angulation of described bevel for welding and heat exchanger tube is 45 °.
6. the Welding Structure that heat exchanger tube according to claim 1 and tube sheet elder generation postwelding expand is characterized in that it is 0～1.5mm that the front end of described heat exchanger tube stretches out bevel for welding length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202884697U CN201799751U (en) | 2010-08-11 | 2010-08-11 | Welding structure adopting expansion after welding for heat exchange pipe and pipe sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202884697U CN201799751U (en) | 2010-08-11 | 2010-08-11 | Welding structure adopting expansion after welding for heat exchange pipe and pipe sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201799751U true CN201799751U (en) | 2011-04-20 |
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|---|---|---|---|
| CN2010202884697U Expired - Lifetime CN201799751U (en) | 2010-08-11 | 2010-08-11 | Welding structure adopting expansion after welding for heat exchange pipe and pipe sheet |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418886A (en) * | 2013-08-15 | 2013-12-04 | 东方电气集团东方锅炉股份有限公司 | Technology for welding carbon steel overlaying welding layer of tube plate of high pressure heat exchanger with low carbon steel tube in sealing way |
| CN104028879A (en) * | 2014-06-30 | 2014-09-10 | 成都高普石油工程技术有限公司 | Tube plate joint welding technology for tube type heat exchanger |
| CN104043893A (en) * | 2014-06-30 | 2014-09-17 | 成都高普石油工程技术有限公司 | Process for fixing connectors of tube plates of heat exchanger |
| CN104084673A (en) * | 2014-06-30 | 2014-10-08 | 成都高普石油工程技术有限公司 | Technology for connecting tube plate with heat exchange tube of heat exchanger |
| CN104084674A (en) * | 2014-06-30 | 2014-10-08 | 成都高普石油工程技术有限公司 | Manufacturing technology for expanded welding and connecting of heat exchanger tube panel and heat exchanging tube |
| CN104191069A (en) * | 2014-07-25 | 2014-12-10 | 武汉宇宙科技有限公司 | Manufacturing process of smoke waste heat exchanger for radiant tube burner |
| CN104613806A (en) * | 2015-01-30 | 2015-05-13 | 永胜机械工业（昆山）有限公司 | Connector for heat exchange tube and tube board of heat exchanger |
| CN105935832A (en) * | 2016-07-06 | 2016-09-14 | 兰州兰石重型装备股份有限公司 | Titanium heat exchange tube welded argon shield device and using method thereof |
| CN108188611A (en) * | 2018-02-01 | 2018-06-22 | 浙江宣达特种合金流程装备股份有限公司 | Heat exchanger tube sheet welding structure |
| CN109277719A (en) * | 2018-11-15 | 2019-01-29 | 海明（江苏）环境科技有限公司 | A kind of heat exchanger tube expanded and welded tube joint clad tubesheet structure |
| CN109396770A (en) * | 2018-12-20 | 2019-03-01 | 东方电气集团东方锅炉股份有限公司 | A kind of replacing options and special right angle boring cutter of expanded joint bulge U-shaped heat exchanger tube |
| CN111283328A (en) * | 2020-03-19 | 2020-06-16 | 昆山华恒焊接股份有限公司 | Method for welding heat exchange tube and tube plate |
| CN114871532A (en) * | 2022-07-11 | 2022-08-09 | 四川空分设备(集团)有限责任公司 | Manual deep hole welding method for heat exchange tube and tube plate |
-
2010
- 2010-08-11 CN CN2010202884697U patent/CN201799751U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418886A (en) * | 2013-08-15 | 2013-12-04 | 东方电气集团东方锅炉股份有限公司 | Technology for welding carbon steel overlaying welding layer of tube plate of high pressure heat exchanger with low carbon steel tube in sealing way |
| CN103418886B (en) * | 2013-08-15 | 2015-06-24 | 东方电气集团东方锅炉股份有限公司 | Technology for welding carbon steel overlaying welding layer of tube plate of high pressure heat exchanger with low carbon steel tube in sealing way |
| CN104028879A (en) * | 2014-06-30 | 2014-09-10 | 成都高普石油工程技术有限公司 | Tube plate joint welding technology for tube type heat exchanger |
| CN104043893A (en) * | 2014-06-30 | 2014-09-17 | 成都高普石油工程技术有限公司 | Process for fixing connectors of tube plates of heat exchanger |
| CN104084673A (en) * | 2014-06-30 | 2014-10-08 | 成都高普石油工程技术有限公司 | Technology for connecting tube plate with heat exchange tube of heat exchanger |
| CN104084674A (en) * | 2014-06-30 | 2014-10-08 | 成都高普石油工程技术有限公司 | Manufacturing technology for expanded welding and connecting of heat exchanger tube panel and heat exchanging tube |
| CN104191069A (en) * | 2014-07-25 | 2014-12-10 | 武汉宇宙科技有限公司 | Manufacturing process of smoke waste heat exchanger for radiant tube burner |
| CN104613806A (en) * | 2015-01-30 | 2015-05-13 | 永胜机械工业（昆山）有限公司 | Connector for heat exchange tube and tube board of heat exchanger |
| CN105935832A (en) * | 2016-07-06 | 2016-09-14 | 兰州兰石重型装备股份有限公司 | Titanium heat exchange tube welded argon shield device and using method thereof |
| CN108188611A (en) * | 2018-02-01 | 2018-06-22 | 浙江宣达特种合金流程装备股份有限公司 | Heat exchanger tube sheet welding structure |
| CN109277719A (en) * | 2018-11-15 | 2019-01-29 | 海明（江苏）环境科技有限公司 | A kind of heat exchanger tube expanded and welded tube joint clad tubesheet structure |
| CN109396770A (en) * | 2018-12-20 | 2019-03-01 | 东方电气集团东方锅炉股份有限公司 | A kind of replacing options and special right angle boring cutter of expanded joint bulge U-shaped heat exchanger tube |
| CN109396770B (en) * | 2018-12-20 | 2023-10-20 | 东方电气集团东方锅炉股份有限公司 | Replacement method of expansion-connection bulge U-shaped heat exchange tube and special right-angle boring cutter |
| CN111283328A (en) * | 2020-03-19 | 2020-06-16 | 昆山华恒焊接股份有限公司 | Method for welding heat exchange tube and tube plate |
| CN114871532A (en) * | 2022-07-11 | 2022-08-09 | 四川空分设备(集团)有限责任公司 | Manual deep hole welding method for heat exchange tube and tube plate |
| CN114871532B (en) * | 2022-07-11 | 2022-10-11 | 四川空分设备(集团)有限责任公司 | Manual deep hole welding method for heat exchange tube and tube plate |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110420 |