CN108971710A - A kind of connection processing technology of tube-tube plate - Google Patents
A kind of connection processing technology of tube-tube plate Download PDFInfo
- Publication number
- CN108971710A CN108971710A CN201810819964.7A CN201810819964A CN108971710A CN 108971710 A CN108971710 A CN 108971710A CN 201810819964 A CN201810819964 A CN 201810819964A CN 108971710 A CN108971710 A CN 108971710A
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- tube
- welding
- tube sheet
- expanded joint
- connection processing
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a kind of connection processing technologys of tube-tube plate, comprising the following steps: carries out built-up welding to tube sheet, forms overlay cladding；Bevel at the pore of overlay cladding on tube sheet；Pipe is penetrated into the pore on tube sheet, tube end is concordant with overlay cladding；Expanded joint is carried out to the welding section of tube-to-tube sheet connection；Tube-to-tube sheet connection is welded, using automatic pulsed tungsten argon arc welding filler wire welding；Expanded joint is carried out to the non-solder area of tube-to-tube sheet connection.The connection processing technology of this tube-tube plate, overlay cladding increases that tube sheet is wear-resisting and corrosion resistance, first time expanded joint eliminates the gap at tube-to-tube sheet connection welding region before welding, improve welding quality, using bevel filler wire welding, reduce risk of leakage, second of expanded joint after welding, eliminate the gap in tube-to-tube sheet connection non-solder area, preventing liquid or impurity from entering generation corrosion leads to welding seam failure, by front and back, expanded joint and bevel filler wire welding, guarantee tube-to-sheet joint quality, the invention are used for field of heat exchangers twice.
Description
Technical field
The present invention relates to field of heat exchangers, more particularly to a kind of connection processing technology of tube-tube plate.
Background technique
C-shaped single tube journey, vertical heat exchanger are one of key equipments in nuclear power system, and tube plate structure is that heat exchanger is common
A kind of structure type, the heat exchanger of tube plate structure frequently with the process of welding or expanded joint or welded and rolled tube joint connection pipe with
Tube sheet.In nuclear power system, heat exchanger operating temperature and pressure are higher, in the work of thermal deformation, thermal shock, heat erosion and Fluid pressure
It under, is easily destroyed at tube-to-sheet joint, wanting for bonding strength and leakproofness is difficult to ensure using expanded joint or welding
It asks.What is be widely used at present is the method for welded and rolled tube joint, considers the welding stress expanded joint residual stress swollen much larger than patch, generally
, using the method for expanded joint after first welding.Expanded joint after first welding, main problem are to control the precision of pore on pipe and tube sheet
And cooperation, when the welding is completed when expanded joint, pipe center line must be overlapped with tube sheet pore center line, and otherwise excessive expanded joint becomes
Welded Joints are generated damage by shape, or even cause weld bond desoldering, in the actual operation process, it is more difficult to which control reaches requirement.
Summary of the invention
The purpose of the present invention is to provide a kind of connection processing technologys of tube-tube plate, it is ensured that the connection matter of tube-tube plate
Amount.
The technical solution used in the present invention is:
A kind of connection processing technology of tube-tube plate, comprising the following steps:
A, built-up welding is carried out to tube sheet, forms overlay cladding；
B, bevel, bevel angle are 45 ° at the pore of overlay cladding on tube sheet, depth 2.5mm；
C, pipe is penetrated into the pore on tube sheet, tube end is concordant with overlay cladding；
D, expanded joint is carried out to the welding section of tube-to-tube sheet connection；
E, tube-to-tube sheet connection is welded, using argon arc welding filler wire welding；
F, expanded joint is carried out to the non-solder area of tube-to-tube sheet connection.
It is further used as the improvement of technical solution of the present invention, in step e, using automatic pulsed tungsten argon arc welding, welding electricity
It is pressed in 8~14V, pulse background current is in 30~190A, and peak point current is in 85~220A.
It is further used as the improvement of technical solution of the present invention, and in step e, speed of welding is 50~80mm/min.
It is further used as the improvement of technical solution of the present invention, and in step e, it is flat to weld larynx in 2.01~2.61mm for weldering larynx size
Having a size of 2.32mm.
It is further used as the improvement of technical solution of the present invention, weldingvoltage 12V, and pulse background current is 160A, peak value
Electric current is 190A.
It is further used as the improvement of technical solution of the present invention, and the expanded joint in step d uses mechanical expanding device, in step f
Expanded joint uses hydraulic tube expander.
It is further used as the improvement of technical solution of the present invention, after the completion of welding in step e, detects to weld seam, to depositing
It is reprocessed in the weld seam of defect, clears up the weld seam of existing defects, then expanded joint and welding again, expanded joint is swollen using being transformed again
Pipe device is transformed between the swollen shell of tube expander and swollen pearl and is equipped with arc-shaped transitional surface or 45 ° of chamferings.
It is further used as the improvement of technical solution of the present invention, and manual argon arc welding, welding current 35 are used when welding again
~85A.
It is further used as the improvement of technical solution of the present invention, and overlay cladding is stainless steel in step a, and the material of pipe is stainless
Steel, the material of tube sheet are low-alloy steel.
It is further used as the improvement of technical solution of the present invention, and the diameter of pipe is 20mm, wall thickness 2.5mm, the thickness of tube sheet
Degree be 170mm, overlay cladding with a thickness of 6mm.
Beneficial effects of the present invention: the connection processing technology of this tube-tube plate, overlay cladding increase the wear-resisting and resistance to of tube sheet
Corrosive power, first time expanded joint eliminates the gap at tube-to-tube sheet connection welding region before welding, and prevents welding uneven and changes
Vibration causes weld bond to generate fatigue rupture in the hot device course of work, improves welding quality, and using bevel filler wire welding, welding is molten
Deep, weld seam bearing cross-section and weld strength are big, reduce risk of leakage, and it is non-to eliminate tube-to-tube sheet connection for second of expanded joint after welding
The gap of welding section, preventing liquid or impurity from entering generation corrosion leads to welding seam failure, and makes tube-to-sheet joint more
Closely, by front and back expanded joint and bevel filler wire welding twice, guarantee the quality of connection of tube-to-tube sheet connection.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings:
Fig. 1 is the structural schematic diagram of pipe of the embodiment of the present invention and tube sheet；
Fig. 2 is the structural schematic diagram of tradition machinery tube expander；
Fig. 3 is the structural schematic diagram of the chamfering transformation of transformation tube expander of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the arc-shaped transitional surface transformation of transformation tube expander of the embodiment of the present invention.
Specific embodiment
Referring to Fig.1~Fig. 4, the present invention are a kind of connection processing technology of tube-tube plate, it is preferred that the diameter of pipe 2 is
20mm, wall thickness 2.5mm, tube sheet 1 with a thickness of 170mm, comprise the following steps that:
A, built-up welding is carried out to tube sheet 1, forms overlay cladding 3, it is preferred that overlay cladding 3 with a thickness of 6mm, resurfacing welding material is not
Become rusty steel, and the material of pipe 2 is stainless steel, and the material of tube sheet 1 is low-alloy steel.
B, bevel 4,4 angle of groove are 45 ° at the pore of overlay cladding 3 on tube sheet 1, depth 2.5mm.
C, pipe 2 is penetrated into the pore on tube sheet 1,2 end of pipe is concordant with overlay cladding 3, concordant degree be -0.5mm~+
0.1mm。
D, expanded joint is carried out to the welding section of pipe 2 and tube sheet 1.
E, pipe 2 and tube sheet 1 are welded, using argon arc welding filler wire welding, welding wire is 0.9mm's using diameter
ER308L welding wire, welding position are vertical-up welding, and the welding number of plies is 1~2 layer.
F, expanded joint is carried out to the non-solder area of pipe 2 and tube sheet 1.
The connection processing technology of this tube-tube plate, overlay cladding 3 increases the wear-resisting and corrosion resistance of tube sheet 1, before welding
First time expanded joint eliminates the gap at pipe 2 and 1 welding region of tube sheet, prevents welding unevenly and in the heat exchanger course of work
Vibration causes weld bond to generate fatigue rupture, improves welding quality, and using 4 filler wire welding of bevel, welding penetration, weld seam carrying are cut
Face and weld strength are big, reduce risk of leakage, and second of expanded joint after welding is eliminated between pipe 2 and 1 non-solder area of tube sheet
Gap, preventing liquid or impurity from entering generation corrosion leads to welding seam failure, and it is even closer to connect pipe 2 with tube sheet 1, passes through
Front and back 4 filler wire welding of expanded joint and bevel twice guarantees the quality of connection of pipe 2 and tube sheet 1.
C-shaped single tube journey in existing nuclear power system, the tube-tube plate welding technology of vertical heat exchanger be square groove not
Fill silk tube-tube plate weld seam welding technique, and tube sheet resurfacing welding material be it is Ni-based, pipe material is also Ni-based, pipe and pore diameter
It is small, it is Ф 17.48mm, pipe wall thickness is small, is 1.01mm.Ni-based material is easy to appear microfissure in welding, thus in the presence of
The risk of leakage.The tube-tube plate weld penetration of square groove is shallow, and weld seam bearing cross-section is also small accordingly, thus weld strength compared with
It is small.Weld seam is when encountering slight friction or colliding with, it is easy to the risk of weld leakage occur.This technique uses stainless steel material
Pipe 2 and low-alloy steel material tube sheet 1, guarantee pipe 2 and tube sheet 1 intensity, using the pipe 2 of larger diameter and wall thickness
And by 4 filler wire welding pipe 2 of bevel and tube sheet 1, increase weld strength, reduce disclosure risk.
Using 4 filler wire welding of bevel, welding difficulty is greatly increased, and (angle is 45 ° to the size of groove 4, and side length is
2.5mm) it is arranged and brings great difficulty to the selection of welding parameter.Since 4 size of groove is smaller, tungsten electrode can not go deep into groove
4 roots limit the necessary sufficiently large ability penetration root of thermal weld stress and meet weldering larynx requirement, but thermal weld stress crosses conference
Cause pipe 2 it is molten collapse, necking.Tungsten electrode, which can not go deep into 4 root of groove, simultaneously may also will lead to electric arc for 1 side of pipe 2 and tube sheet
Wall metal first melts, and the molten iron after dissolving is formed under the action of surface tension of liquid floats on the molten bath above root, hinders electricity
Arc makes it be unable to reach root, forms sealed chamber with the root of weld, leads to root lack of fusion, it is therefore necessary to which selection is just arrived
The welding parameter at place just can guarantee the quality of root run.By the adjustment of a large amount of engineer testing and technological parameter, obtain
Optimal welding condition and Rework Technics parameter.
As a preferred embodiment of the present invention, in step e, using automatic pulsed tungsten argon arc welding, weldingvoltage 8~
14V, pulse background current is in 30~190A, and peak point current is in 85~220A.
As a preferred embodiment of the present invention, in step e, speed of welding is 50~80mm/min.
As a preferred embodiment of the present invention, in step e, weldering larynx size welds larynx average-size in 2.01~2.61mm
For 2.32mm.
4 filler wire welding of bevel uses above-mentioned parameter in this technique, can get the good weld seam of forming, and the root of weld does not connect
Unqualified continuous digit is 0, and weld porosity is eliminated.Preferably, using biggish weldingvoltage and welding current, weldingvoltage
For 12V, pulse background current is 160A, peak point current 190A, speed of welding 60mm/min, it is ensured that sweating heat is enough
Greatly, penetration root meet weldering larynx require and not will lead to pipe 2 it is molten collapse, necking.
As a preferred embodiment of the present invention, expanded joint uses mechanical expanding device in step d, and expanded joint uses liquid in step f
Press tube expander.The depth of mechanical expanding device expanded joint is welding section, and the expanded joint depth of hydraulic tube expander is non-solder area, i.e. tube sheet
1 thickness subtracts the depth of mechanical expanding device expanded joint, and the expanded joint depth of hydraulic tube expander is greater than the depth of mechanical expanding device expanded joint.
As a preferred embodiment of the present invention, after the completion of being welded in step e, weld seam is detected, to existing defects
Weld seam reprocessed, clear up the weld seam of existing defects, then expanded joint and welding again, again expanded joint using transformation tube expander,
It is illustrated in figure 2 traditional mechanical expanding device, when Weld Seam Repairation, cleans up weld seam, be swollen due to the presence of groove 4, at groove 4
Neutral gear region is connect, will lead to the reduction of swollen pearl 6 effective expanded joint length, the decline of expanded joint intensity influences expanded joint effect, such as Fig. 3 and Fig. 4 institute
Show, is transformed between the swollen shell 5 of tube expander and swollen pearl 6 and is equipped with arc-shaped transitional surface or 45 ° of chamferings, arc-shaped transitional surface or fillet surface and slope
4 face contacts of mouth improve expanded joint effect to guarantee that expanded joint length is swollen 6 length of pearl.
Preferably, manual argon arc welding is used when welding again, welding current is 35~85A, and the welding number of plies is 1~3 layer.
Certainly, the invention is not limited to above embodiment, and those skilled in the art are without prejudice to originally
Equivalent modifications or replacement can be also made under the premise of spirit, these equivalent variation or replacement are all contained in the application right
It is required that in limited range.
Claims (10)
1. a kind of connection processing technology of tube-tube plate, which comprises the following steps:
A, built-up welding is carried out to tube sheet (1), is formed overlay cladding (3)；
B, bevel (4), groove (4) angle are 45 ° at the pore of overlay cladding (3) on tube sheet (1), depth 2.5mm；
C, pipe (2) is penetrated into the pore on tube sheet (1), pipe (2) end is concordant with overlay cladding (3)；
D, expanded joint is carried out to the welding section of pipe (2) and tube sheet (1)；
E, pipe (2) and tube sheet (1) are welded, using argon arc welding filler wire welding；
F, expanded joint is carried out to the non-solder area of pipe (2) and tube sheet (1).
2. the connection processing technology of tube-tube plate according to claim 1, it is characterised in that: in the step e, using certainly
Moving pulse argon tungsten-arc welding, weldingvoltage is in 8~14V, and pulse background current is in 30~190A, and peak point current is in 85~220A.
3. the connection processing technology of tube-tube plate according to claim 1, it is characterised in that: in the step e, welding speed
Degree is 50~80mm/min.
4. the connection processing technology of tube-tube plate according to claim 1, it is characterised in that: in the step e, weld larynx ruler
It is very little in 2.01~2.61mm, weldering larynx average-size is 2.32mm.
5. the connection processing technology of tube-tube plate according to claim 2, it is characterised in that: weldingvoltage 12V, pulse
Background current is 160A, peak point current 190A.
6. the connection processing technology of tube-tube plate according to claim 1, it is characterised in that: the expanded joint in the step d
Using mechanical expanding device, the expanded joint in the step f uses hydraulic tube expander.
7. the connection processing technology of tube-tube plate according to claim 1, it is characterised in that: welded in the step e
Cheng Hou detects weld seam, reprocesses to the weld seam of existing defects, clears up the weld seam of existing defects, then expanded joint again
And welding, expanded joint is equipped with circular arc mistake between the swollen shell (5) and swollen pearl (6) of the transformation tube expander using transformation tube expander again
Cross face or 45 ° of chamferings.
8. the connection processing technology of tube-tube plate according to claim 7, it is characterised in that: using by hand when welding again
Argon arc welding, welding current are 35~85A.
9. the connection processing technology of tube-tube plate according to claim 1, it is characterised in that: overlay cladding in the step a
It (3) is stainless steel, the material of pipe (2) is stainless steel, and the material of tube sheet (1) is low-alloy steel.
10. the connection processing technology of tube-tube plate described according to claim 1~any one of 9, it is characterised in that: described
The diameter of pipe (2) is 20mm, wall thickness 2.5mm, tube sheet (1) with a thickness of 170mm, overlay cladding (3) with a thickness of 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810819964.7A CN108971710B (en) | 2018-07-24 | 2018-07-24 | Connecting and processing technology of tube and tube plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810819964.7A CN108971710B (en) | 2018-07-24 | 2018-07-24 | Connecting and processing technology of tube and tube plate |
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| Publication Number | Publication Date |
|---|---|
| CN108971710A true CN108971710A (en) | 2018-12-11 |
| CN108971710B CN108971710B (en) | 2021-03-12 |
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| CN201810819964.7A Active CN108971710B (en) | 2018-07-24 | 2018-07-24 | Connecting and processing technology of tube and tube plate |
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| CN110370662A (en) * | 2019-07-15 | 2019-10-25 | 北京美景华夏环保科技有限公司 | Sweating soldering device for plastic tube and plastics orifice plate |
| CN110595103A (en) * | 2019-10-30 | 2019-12-20 | 远大空调有限公司 | High-temperature generator tube plate structure for lithium bromide cold-warm water unit |
| CN111069775A (en) * | 2019-12-31 | 2020-04-28 | 哈电集团（秦皇岛）重型装备有限公司 | Connecting system and method for heat exchange tube and tube plate |
| CN111203669A (en) * | 2020-01-17 | 2020-05-29 | 哈尔滨锅炉厂有限责任公司 | Pipe-pipe plate welding groove suitable for nickel-based welding material |
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| CN112756835A (en) * | 2021-01-29 | 2021-05-07 | 东方电气集团东方锅炉股份有限公司 | Method for processing surfacing layer of butt weld of tube plate |
| CN113049363A (en) * | 2021-03-24 | 2021-06-29 | 哈尔滨锅炉厂有限责任公司 | Heat exchanger tube-tube plate welding pull-out force experimental method |
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| CN112756835B (en) * | 2021-01-29 | 2022-10-28 | 东方电气集团东方锅炉股份有限公司 | Method for processing surfacing layer of butt weld of tube plate |
| CN113049363A (en) * | 2021-03-24 | 2021-06-29 | 哈尔滨锅炉厂有限责任公司 | Heat exchanger tube-tube plate welding pull-out force experimental method |
| CN113441818A (en) * | 2021-08-16 | 2021-09-28 | 哈尔滨焊接研究院有限公司 | Welding method for tube plate of sodium-cooled fast reactor evaporator tube |
| CN113441818B (en) * | 2021-08-16 | 2022-06-24 | 哈尔滨焊接研究院有限公司 | Welding method for tube plate of sodium-cooled fast reactor evaporator tube |
| 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 |
| CN114101522A (en) * | 2021-11-12 | 2022-03-01 | 山东凯斯达机械制造有限公司 | Connection process of heat exchanger tube plate and heat exchange tube |
| CN114101522B (en) * | 2021-11-12 | 2023-08-29 | 山东凯斯达机械制造有限公司 | Connection process of heat exchanger tube plate and heat exchange tube |
| 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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