CN105397396A - Inner pipe shallow hole welding assembly device of jacket heat exchanger jacketed pipe, jacket heat exchanger and welding method of jacketed pipe - Google Patents
Inner pipe shallow hole welding assembly device of jacket heat exchanger jacketed pipe, jacket heat exchanger and welding method of jacketed pipe Download PDFInfo
- Publication number
- CN105397396A CN105397396A CN201510923291.6A CN201510923291A CN105397396A CN 105397396 A CN105397396 A CN 105397396A CN 201510923291 A CN201510923291 A CN 201510923291A CN 105397396 A CN105397396 A CN 105397396A
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- pipe
- jacket
- group
- locator
- exchanger
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0531—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor internal pipe alignment clamps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses an inner pipe shallow hole welding assembly device of a jacket heat exchanger jacketed pipe, a jacket heat exchanger and a welding method of the jacketed pipe. The assembly device is used for seamless assembly between an inner pipe of the jacketed pipe and connecting grooves of end connecting pieces of the jacketed pipe and structurally comprises a claw type locator, a rotating pull rod, a lock nut and a beating handle. One end of the rotating pull rod penetrates the center axis of the claw type locator and is fixedly connected through a bolt and a nut. The beating handle is arranged at the other end of the rotating pull rod and limited through the lock nut. The assembly device is used on the inner pipe of the straight jacketed pipe and the inner sides of the grooves of the connecting pieces, and the problem of the eccentric misalignment of a pipe fitting during assembly of the inner pipe and the grooves is solved through assembly and spot welding of the assembly device. The concentricity of the inner pipe and the grooves is controlled by controlling the linearity deviation of the locator, and the wrong variable of the inner pipe and the grooves is controlled by controlling the outer diameter deviation of the locator. The assembly device is of a detachable structure and is simple and easy to detach. The assembly device can be recycled, and the assembly device is suitable for sleeve type equipment with inner pipes of the same type.
Description
Technical field
The interior pipe that the present invention relates to the various chuck straight tubes in petrochemical equipment is positioned at the group of inner more shallow position to technology, particularly in jacket heat-exchanger jacket pipe pipe shallow bore hole weldering group to the welding method of device, jacket heat-exchanger and jacket pipe.
Technical background
Rapid-cooling heat exchanger is the key equipment that in ethylene cracker, manufacturability is very strong.From technique, Quick cooling heat exchanger for cracking gas is mainly divided into one-level rapid-cooling heat exchanger and secondary rapid-cooling heat exchanger, sometimes also adopts three grades of rapid-cooling heat exchangers for gas raw material.
Bushing type rapid-cooling heat exchanger is normally in a row side by side by many sleeve pipes be made up of inner and outer pipe, and inner and outer pipe is connected with upper and lower header by upper and lower connector at outer tube two ends place by every bar sleeve pipe.Bushing type rapid-cooling heat exchanger mainly bears two functions: the Pintsch process gas of about 800 DEG C is cooled to rapidly below secondary response temperature by the first, reduces olefin loss; It two is the high level heats reclaiming cracking gas as much as possible, produces the high steam of about 12.0MPa.The tube side medium of bushing type rapid-cooling heat exchanger is the cracking gas of HTHP, and the weld seam of interior pipe and connector is very near cracking gas import, this just requires that the weld seam of interior pipe and connector has higher welding quality, guarantee can not cause because of weld defect revealing thus occurring security incident after cracking gas access arrangement, therefore, to ensure and the welding quality improving this weld seam is very important.
But, the quality of weld seam be unable to do without group to weld, when in particularly adopting, U groove carries out internal bore welding, because this road weld seam is after inner and outer pipe poling by the manufacturing technology requirement that product design proposes, first solder mask pipe, after carry out the welding of inner sleeve, belong to sleeve pipe and close up seam, so directly weld seam cannot be seen from outside, can only be observed by the sighting distance that end is limited, interior pipe and the right concentricity of connector group and wrong variable directly have influence on welding quality, are rings very important in bushing type rapid-cooling heat exchanger manufacture process.
To sum up, from source, invent and a kind ofly effectively can control the concentricity of interior pipe and connector and wrong variable, the welding for this road weld seam provides best welding condition, has important engineering significance with the structure and method that improve weldquality.
Summary of the invention
An object of the present invention is avoid weak point of the prior art and provide the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe to device, regulate the group of interior pipe and end coupling to unfitness of butt joint and concentricity by this group to device, for welding provides best welding condition, thus control weldquality, ensure the quality of cracking gas import department critical welding seams, prevent the security incident that equipment is revealed and it produces.
Two of object of the present invention is avoid weak point of the prior art and provide jacket heat-exchanger, adopts above-mentioned group to connect device welding between the connection groove of the interior Guan Yuqi end coupling of the jacket pipe of this jacket heat-exchanger.
The welding method that three of object of the present invention is to avoid weak point of the prior art and provides jacket heat-exchanger jacket pipe and end coupling, welding can be ensured to provide best welding condition by this welding method, thus control weldquality, ensure the quality of cracking gas import department critical welding seams, prevent the security incident that equipment is revealed and it produces, extend the service life of jacket heat-exchanger.
Above object of the present invention realizes respectively by following technical scheme:
Provide the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe to device, its for Guan Yuqi end coupling in the jacket pipe of jacket heat-exchanger connection groove between gapless group pair, described group comprises claw locator, rotating rod, locking nut to device and beats handle, one end of described rotating rod is worn the central axis of described claw locator and is fixedly connected with by bolt and nut, beat handle described in the other end of described rotating rod is arranged, described in beat handle spacing by described locking nut.
Preferably, described claw locator comprises the structure of more than at least three-jaw, and more than described at least three-jaw structure distributes along the even circumferential of described claw locator.
Preferably, described claw locator is three-jaw structure or four paws structure.
Preferably, the inside of described claw locator is set to hollow-core construction.
Preferably, the leading section of described claw locator and rearward end are all set to rounding structure.
Preferably, the outer surface of described claw locator is provided with smooth abrasion-proof layer.
Preferably, band gap fit between handle and described rotating rod is beaten described in.
Additionally provide jacket heat-exchanger, comprise the jacket pipe be made up of inner and outer tubes, and be positioned at the end coupling at described jacket pipe both ends, wherein, by the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe described above, device welding is connected between the connection groove of the interior Guan Yuqi end coupling of described jacket pipe.
Additionally provide the welding method of jacket heat-exchanger jacket pipe and end coupling, it comprises the following steps:
Step one, after interior pipe and outer tube poling, first welds the weld seam of end coupling and outer tube;
Step 2, in the welding carrying out the weld seam between the connection groove of interior pipe and end coupling after the weld seam of above-mentioned end coupling and outer tube welds;
Wherein the concrete operations of step 2 are as follows: pipe shallow bore hole weldering group in jacket heat-exchanger jacket pipe described above is filled in interior pipe to device from the side of the weld seam between the connection groove near interior pipe and end coupling, move this group to the position of device to connecting groove, the position of this group to device is adjusted before and after the central axial direction of interior pipe, rotate this group again to the orientation of device to make the pawl structure distribution of described claw locator at the position without the need to spot welding, secondly, interior pipe is stretched into from the end adjustment welding gun of interior pipe, spot welding position is found accurately by illumination auxiliary device, then, connecting the circumferentially even spot welding of groove to reach group to point weldering, finally, spot welding completes, dismantle this group to device, welding gun is again utilized to complete welding of weld seam between the connection groove of interior pipe and end coupling.
Preferably, described illumination auxiliary device is flashlight or camera.
beneficial effect of the present invention:
The interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe of the present invention is to device, its for Guan Yuqi end coupling in the jacket pipe of jacket heat-exchanger connection groove between gapless group pair, described group comprises claw locator, rotating rod, locking nut to device and beats handle, one end of described rotating rod is worn the central axis of described claw locator and is fixedly connected with by bolt and nut, beat handle described in the other end of described rotating rod is arranged, described in beat handle spacing by described locking nut.Compared with prior art, by group to device group to, spot welding, solve the problem of the eccentric misalignment of pipe fitting during the connection groove group pair of the interior Guan Yuqi end coupling of the jacket pipe of jacket heat-exchanger, the concentricity of the two is controlled by the linearity deviation controlling locator, the wrong variable of the two is controlled by the outside diameter tolerance controlling locator, make to present invention achieves group that the interior U groove shallow bore hole between interior pipe and end coupling welds to spot welding, solve shallow bore hole weldering and cannot organize right problem from outside; Achieve group that the interior U groove shallow bore hole between interior pipe and end coupling welds to the control of parameter, in effectively controlling, pipe and the group of end coupling are to concentricity, for welding provides best welding condition; Achieve group that the interior U groove shallow bore hole between interior pipe and end coupling welds to the control of parameter, in effectively controlling, pipe and the group of connector are to unfitness of butt joint, for welding provides best welding condition; Achieve group between interior pipe and end coupling to location, group to after carry out fixing point weldering, play positioning supports effect, and this group is simple to device structure, easy disassembly, recyclable recycling, and internally cast number identical bushing type rapid-cooling heat exchanger equipment is all applicable, applies very extensive.
Jacket heat-exchanger of the present invention, comprise the jacket pipe be made up of inner and outer tubes, and be positioned at the end coupling at described jacket pipe both ends, wherein, by the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe described above, device welding is connected between the connection groove of the interior Guan Yuqi end coupling of described jacket pipe.Make this jacket heat-exchanger welding quality good, service life extends.
The welding method of jacket heat-exchanger jacket pipe of the present invention and end coupling, it comprises first by after interior pipe and outer tube poling, first welds the weld seam of end coupling and outer tube; In the welding carrying out the weld seam between the connection groove of interior pipe and end coupling after welding; The method of this welding can meet the precondition of above-mentioned welding, has welding method described above equally simple, easy to operate, the feature such as the weldquality of welding is good.
Accompanying drawing explanation
The invention will be further described to utilize accompanying drawing, but the embodiment in accompanying drawing does not form any limitation of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, can also obtain other accompanying drawing according to the following drawings.
Fig. 1 is that the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe of the present invention is to the structural representation of device.
Fig. 2 is that the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe of the present invention is to the structural representation of the claw locator of device.
Include in fig. 1 and 2:
1---beat handle, 2---locking nut, 3---rotating rod, 4---claw locator,
A---end coupling, B---interior pipe, C---outer tube, the weld seam of D---end coupling and outer tube, the weld seam between the connection groove of H---interior pipe and end coupling, E---top, F---bottom.
Detailed description of the invention
Below in conjunction with accompanying drawing, further detailed description is done to the specific embodiment of the present invention:
It should be noted that: the jacket heat-exchanger that the present invention mentions can be rapid-cooling heat exchanger, and this jacket heat-exchanger is made up of multiple jacket pipe, and so-called jacket pipe refers to that the pipe box that overall diameter is less enters in the pipe formed inside the larger pipe of interior diameter to have tubular construction.
embodiment 1
The interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe of the present invention is to device, its for pipe B in the jacket pipe of jacket heat-exchanger and its end coupling A connection groove between gapless group pair, described group comprises claw locator 4, rotating rod 3, locking nut 2 to device and beats handle 1, one end of described rotating rod 3 is worn the central axis of described claw locator 4 and is fixedly connected with by bolt and nut, beat handle 1 described in the other end of described rotating rod 3 is arranged, described in beat handle 1 spacing by described locking nut 2.Group adopts bolt and nut to connect between the claw locator 4 of device and rotating rod 3, makes this group to device for can dismountable head, without the need to being fixed on equipment, easy mounting or dismounting, simple and convenient, to device fabrication without any harmful effect, be also convenient to deposit and carry simultaneously.Compared with prior art, by group to device group to, spot welding, solve the problem of the eccentric misalignment of pipe fitting during the connection groove group pair of the interior pipe B of jacket pipe of jacket heat-exchanger and its end coupling A, the concentricity of the two is controlled by the linearity deviation controlling locator, the wrong variable of the two is controlled by the outside diameter tolerance controlling locator, make to present invention achieves group that the interior U groove shallow bore hole between interior pipe B and end coupling A welds to spot welding, solve shallow bore hole weldering and cannot organize right problem from outside; Achieve group that the interior U groove shallow bore hole between interior pipe B and end coupling A welds to the control of parameter, in effectively controlling, the group of pipe B and end coupling A is to concentricity, provides best welding condition for welding; Achieve group that the interior U groove shallow bore hole between interior pipe B and end coupling A welds to the control of parameter, in effectively controlling, pipe B and the group of connector are to unfitness of butt joint, provide best welding condition for welding; Achieve group between interior pipe B and end coupling A to location, group to after carry out fixing point weldering, play positioning supports effect, and this group is simple to device structure, easy disassembly, recyclable recycling, and internally pipe Type B number identical bushing type rapid-cooling heat exchanger equipment is all applicable, applies very extensive.
Installation method of the present invention, after first rotating rod 3 and claw locator 4 being assembled by bolt and nut, then will be beaten after handle 1 is in place and lock with locking nut 2, during dismounting, first unclamped by locking nut 2, then unclamp bolt and nut, beaing handle 1 can install and remove together with rotating rod 3.
Concrete, described claw locator 4 comprises the structure of more than at least three-jaw, and more than described at least three-jaw structure distributes along the even circumferential of described claw locator 4.Claw locator 4 can adopt axially symmetric structure, also can adopt incomplete axially symmetric structure.
Concrete, described claw locator 4 is three-jaw structure or four paws structure.The bottom of claw locator 4 adopts three-jaw or four paws structure, and can provide enough spaces for welding gun spot welding, bottom it, three-jaw or four paws are circumferentially uniformly distributed, and group can be facilitated to rotate device, and the group being not limited to a direction is right.
Concrete, the inside of described claw locator 4 is set to hollow-core construction.The inside of claw locator 4 adopts hollow-core construction, on the one hand in order to alleviate the weight of group to device, is also after finishing using, extract difficult problem in order to solve group out to device on the other hand.
Concrete, leading section and the rearward end of described claw locator 4 are all set to rounding structure.The sliding angle of rounding is carried out in the top E of claw locator 4 and the end of bottom F, facilitates group to device into and out of interior pipe B, prevents group to the scratch of the internal pipe B of device.
Concrete, the outer surface of described claw locator 4 is provided with smooth abrasion-proof layer.Outer surface roughness for claw locator 4 requires smooth abrasion-proof, facilitates group to device into and out of interior pipe B, prevents group to device internal pipe B scratch simultaneously.
Concrete, described in beat band gap fit between handle 1 and described rotating rod 3.Beaing between handle 1 and rotating rod 3 and adopt gap fit, making without the need to adopting other External Force Actings can make group to device into and out of interior pipe B to group to device, prevent that other External Force Actings are uneven causes interior pipe B to damage or cannot take out group occurs the situation of device.
embodiment 2
Jacket heat-exchanger of the present invention, comprise the jacket pipe be made up of interior pipe B and outer tube C, and be positioned at the end coupling A at described jacket pipe both ends, wherein, the interior pipe shallow bore hole weldering group by jacket heat-exchanger jacket pipe described above between the interior pipe B of described jacket pipe and the connection groove of its end coupling A connects device welding.Make this jacket heat-exchanger welding quality good, service life extends.
embodiment 3
The welding method of jacket heat-exchanger jacket pipe of the present invention and end coupling, comprises step one, after interior pipe B and outer tube C poling, first welds the weld seam D of end coupling A and outer tube C; Step 2, the welding of the weld seam H after the weld seam D of above-mentioned end coupling A and outer tube C welds between the connection groove carrying out interior pipe B and end coupling A, because this road weld seam H is after interior pipe B, outer tube C poling, the welding of weld seam H is carried out again after the weld seam D of end coupling A and outer tube C welds, belong to and close up weld seam in sleeve pipe, so cannot directly see weld seam H from outside, can only be grouping from pipe inside.By first-class for claw locator 4 rotating rod 3, locking nut 2 with beat handle 1 after fill in interior pipe B near weld seam H side, the mobile group of position to device is to connecting groove place, the position of this group to device is adjusted before and after the central axial direction of interior pipe B, rotate the orientation of group to device again, make the pawl structure distribution of the bottom of claw locator 4 at the position without the need to spot welding, from interior pipe B end portion adjustment welding gun, stretch into pipe inside, spot welding position is found accurately by flashlight or first-class auxiliary equipment of making a video recording, at groove circumferentially even spot welding 3 or multiple spot, reach the two group right, the object of spot welding.
After spot welding completes, dismounting group, to device, stretches into welding gun from interior pipe B end portion, carries out the welding of weld seam H, can complete the manufacture of jacket pipe.The method of this welding can meet the precondition of above-mentioned welding, has welding method described above equally simple, easy to operate, the feature such as the weldquality of welding is good.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although done to explain to the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.Such as, the present invention is mainly applicable to jacket heat-exchanger, but is suitable for too for other bushing type equipment of the same type.
Claims (10)
1. the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe is to device, it is characterized in that: for Guan Yuqi end coupling in the jacket pipe of jacket heat-exchanger connection groove between gapless group pair, described group comprises claw locator, rotating rod, locking nut to device and beats handle, one end of described rotating rod is worn the central axis of described claw locator and is fixedly connected with by bolt and nut, beat handle described in the other end of described rotating rod is arranged, described in beat handle spacing by described locking nut.
2. the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe according to claim 1 is to device, it is characterized in that: described claw locator comprises the structure of more than at least three-jaw, and more than described at least three-jaw structure distributes along the even circumferential of described claw locator.
3. the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe according to claim 2 is to device, it is characterized in that: described claw locator is three-jaw structure or four paws structure.
4. the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe according to claim 1 is to device, it is characterized in that: the inside of described claw locator is set to hollow-core construction.
5. the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe according to claim 1 is to device, it is characterized in that: leading section and the rearward end of described claw locator are all set to rounding structure.
6. the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe according to claim 1 is to device, it is characterized in that: the outer surface of described claw locator is provided with smooth abrasion-proof layer.
7. the interior pipe shallow bore hole weldering group of jacket heat-exchanger jacket pipe according to claim 1 is to device, it is characterized in that: described in beat band gap fit between handle and described rotating rod.
8. jacket heat-exchanger, comprise the jacket pipe be made up of inner and outer tubes, and be positioned at the end coupling at described jacket pipe both ends, it is characterized in that: by pipe shallow bore hole weldering group in the jacket heat-exchanger jacket pipe in claim 1 to 7 described in any one, device welding is connected between the connection groove of the interior Guan Yuqi end coupling of described jacket pipe.
9. the welding method of jacket heat-exchanger jacket pipe and end coupling, is characterized in that, comprises the following steps:
Step one, after interior pipe and outer tube poling, first welds the weld seam of end coupling and outer tube;
Step 2, in the welding carrying out the weld seam between the connection groove of interior pipe and end coupling after the weld seam of above-mentioned end coupling and outer tube welds;
Wherein the concrete operations of step 2 are as follows: pipe shallow bore hole weldering group in the jacket heat-exchanger jacket pipe in claim 1 to 7 described in any one is filled in interior pipe to device from the side of the weld seam between the connection groove near interior pipe and end coupling, move this group to the position of device to connecting groove, the position of this group to device is adjusted before and after the central axial direction of interior pipe, rotate this group again to the orientation of device to make the pawl structure distribution of described claw locator at the position without the need to spot welding, secondly, interior pipe is stretched into from the end adjustment welding gun of interior pipe, spot welding position is found accurately by illumination auxiliary device, then, connecting the circumferentially even spot welding of groove to reach group to point weldering, finally, spot welding completes, dismantle this group to device, welding gun is again utilized to complete welding of weld seam between the connection groove of interior pipe and end coupling.
10. the welding method of jacket heat-exchanger jacket pipe according to claim 9 and end coupling, is characterized in that: described illumination auxiliary device is flashlight or camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510923291.6A CN105397396B (en) | 2015-12-14 | 2015-12-14 | Welding method of the inner tube shallow bore hole weldering group of jacket heat-exchanger jacket pipe to device, jacket heat-exchanger and jacket pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510923291.6A CN105397396B (en) | 2015-12-14 | 2015-12-14 | Welding method of the inner tube shallow bore hole weldering group of jacket heat-exchanger jacket pipe to device, jacket heat-exchanger and jacket pipe |
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| Publication Number | Publication Date |
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| CN105397396A true CN105397396A (en) | 2016-03-16 |
| CN105397396B CN105397396B (en) | 2017-12-08 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107855721A (en) * | 2017-09-20 | 2018-03-30 | 上海市安装工程集团有限公司 | The prefabricated platform and method for prefabricating of jacket pipe |
| RU2657270C1 (en) * | 2017-04-04 | 2018-06-09 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" | Method for determining a slant of annular welded joints of steel pipes |
| CN109317896A (en) * | 2018-11-23 | 2019-02-12 | 哈电集团（秦皇岛）重型装备有限公司 | A kind of thermal shock casing and safe end assemble fixed device |
| CN110449697A (en) * | 2019-08-06 | 2019-11-15 | 张家港市江南锅炉压力容器有限公司 | Interior pipe heating device for linear quencher and the inner tube welding method using it |
| CN110977132A (en) * | 2019-12-23 | 2020-04-10 | 东方电气集团东方汽轮机有限公司 | Welding structure and method of multilayer sleeve structure |
| 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 |
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