CN113983850B - Fin tube and electron beam welding process thereof - Google Patents
Fin tube and electron beam welding process thereof Download PDFInfo
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- CN113983850B CN113983850B CN202111273185.XA CN202111273185A CN113983850B CN 113983850 B CN113983850 B CN 113983850B CN 202111273185 A CN202111273185 A CN 202111273185A CN 113983850 B CN113983850 B CN 113983850B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
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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
- B23K15/00—Electron-beam welding or cutting
- B23K15/0006—Electron-beam welding or cutting specially adapted for particular articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
- F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
Abstract
本发明公开一种翅片管及其电子束焊接工艺，所述翅片管包括内部的耐压管与外部的外管，所述耐压管与外管之间均匀间隔设置有若干个翅片，所述翅片沿耐压管轴向设置，所述翅片为空心结构，所述外管横截面为多边形，翅片管的电子束焊接工艺为采用分束电子束根据焊接波形图完成每个面的点焊、定位焊和正式焊接，按照既定焊接工艺进行焊接，采用分束电子束焊接技术可以实现一次单面的三条焊缝同步焊接，控制分束焊接路径避免焊缝间的焊接干扰，有效控制焊接变形，且提高了焊缝深宽比，从而实现新型翅片管稳定可靠的分束脉冲电子束焊接。
The invention discloses a fin tube and an electron beam welding process thereof. The fin tube comprises an inner pressure-resistant tube and an outer tube. A plurality of fins are evenly spaced between the pressure-resistant tube and the outer tube. The fins are arranged along the axial direction of the pressure-resistant tube. The fins are hollow structures. The cross section of the outer tube is polygonal. The electron beam welding process of the fin tube adopts a split electron beam to complete spot welding, positioning welding and formal welding of each surface according to a welding waveform diagram, and welding is performed according to an established welding process. The split electron beam welding technology can realize synchronous welding of three welds on a single side at one time, control the split beam welding path to avoid welding interference between welds, effectively control welding deformation, and improve the depth-to-width ratio of the weld, thereby realizing stable and reliable split beam pulse electron beam welding of a novel fin tube.
Description
Technical Field
The invention belongs to the technical field of metal material welding, and particularly relates to a finned tube and an electron beam welding process thereof.
Background
The existing finned tube is usually provided with fins on the surface of the heat exchange tube, the surface area of the heat exchange tube is increased to improve the heat exchange efficiency, a plurality of micro-channels are designed in the finned tube to further improve the heat exchange efficiency of the finned tube, the fin structure is thin and narrow, the flow channels are tiny and dense, the structure is complex, the finned tube is machined in an electric spark machining mode in the prior art, the fin flow channel structure is realized, the sealing is realized by adopting a welding technology, the precision of the finned tube is influenced by welding deformation, the channels are required to be sealed after machining, and independent heat exchange of the channels is guaranteed, so that higher requirements are put forward for the welding method, quality and precision of the finned tube.
Disclosure of Invention
In order to solve the problems, the invention provides the finned tube and the electron beam welding process thereof, which improve the heat exchange efficiency of the heat exchange tube, can realize micro-channel precise welding of the finned tube by adopting beam splitting electron beam welding, can control welding deformation to realize effective welding penetration, and ensure independent sealing of a runner so as to ensure welding quality and precision control.
The invention is realized by the following technical scheme:
the finned tube comprises an internal pressure-resistant tube and an external outer tube, wherein the cross section of the outer tube is polygonal, a plurality of fins are uniformly arranged between the pressure-resistant tube and the outer tube at intervals, and the fins are axially arranged along the pressure-resistant tube and are of hollow structures.
Further, the fin thickness is 1 mm-1.5 mm.
Further, the aspect ratio of the fins is 1 mm-1.5 mm.
Further, the cross section of the outer tube is hexagonal.
An electron beam welding process of a finned tube mainly comprises the following steps:
firstly, installing a finned tube into a vacuum electron beam welding machine, fixing the finned tube by utilizing a tool, closing a vacuum chamber furnace door of the vacuum electron beam welding machine, and vacuumizing;
Step two, determining three welding seams to be welded on each end face of the outer tube of the finned tube, and carrying out beam-splitting electron beam welding on each end face of the finned tube according to the generated welding oscillogram and an electron beam modeling program;
In the beam splitting electron beam welding process, intermittent spot welding is carried out on the weld joint to be welded on each end face of the outer tube by adopting a beam splitting electron beam; then, beam splitting electron beams are adopted to carry out small beam welding so as to achieve the purpose of reducing the gap of butt welding seams; finally, adopting a beam splitting electron beam to carry out pulse electron beam welding on the surface to be welded so as to achieve the penetration and the width of the steel plate with large depth-to-width ratio and realize the connection of the fins and the outer tube;
And thirdly, after the electron beam welding of each surface is finished, opening the furnace door of the vacuum chamber to take out the finned tube after the finned tube is cooled, and finally forming the finned tube with a required structure.
Further, in the second step, the intermittent spot welding intervals are 50mm.
Further, before the fin micro-channel oil stain is removed by using alcohol and acetone solvents in the vacuum electron beam welding machine.
Further, in the intermittent spot welding process, the voltage is 150KV, the beam current is 0.5-5 mM A, the speed is 800-1500 mM/min, and the scanning frequency F is as follows: 1-1000 HZ, graph amplitude range: 0.1-10 mm, and the treatment time is 1-100 s; the six faces are completely spot welded through a rotating tool;
In the small beam welding process, the voltage is 150KV, the beam current is 5-10 mA, the speed is 800-1500 mm/min, and the scanning frequency F is as follows: 1-1000 HZ, graph amplitude range: 0.1-10 mm;
In the pulse electron beam welding process, the voltage is 150KV, the beam current is 10-30 mA, the speed is 800-1500 mm/min, and the scanning frequency F is as follows: 1-1000 HZ, graph amplitude range: 0.1-10 mm.
Further, in the beam splitting electron beam welding process, the welding waveform is a triangular waveform, the size of the triangular waveform is determined according to the position of a welding seam to be welded of the finned tube, the height of the welding waveform is A, the bottom width B of the welding waveform is the distance between two welding seams on the outer side, and A: b=1: 2.
The invention has the beneficial effects that:
1. The fin tube structure can greatly improve heat exchange efficiency, adopts a beam-splitting electron beam welding mode, accurately positions welding seam positions, can realize synchronous sealing welding of a plurality of fin micro-channels, and effectively controls welding deformation;
2. the invention can obtain larger depth-to-width ratio by the beam splitting pulse electron beam welding method, improves the depth-to-width ratio of the welding seam, and is suitable for the precise welding requirement of the fin micro-channel of the structural member;
3. The invention controls the beam-splitting welding path to avoid welding interference among welding seams, so that the welding of a plurality of surfaces of the polygonal finned tube is not interfered with each other, the process and the method are stable, the deformation of the welded finned tube is ensured, and the precise welding forming of the whole finned tube can be completed;
4. The invention utilizes beam splitting pulse to control the energy distribution and welding path of electron beam welding, provides a new technical approach for the development direction of the manufacturing technology of the special-shaped thin-wall microchannel finned tube in the future, and can obtain remarkable economic benefit in batch production;
in summary, the invention adopts beam-splitting electron beam welding to realize the sealing welding of the finned tube with extremely narrow gap welding seams, realizes electron beam welding seams with large depth-to-width ratio, can control welding deformation to realize effective welding penetration, ensures independent sealing of flow channels, ensures welding quality and deformation control, reduces welding deformation to realize control of precision of the finned tube, can realize precise welding of complex micro-channels of long finned tubes, solves the problems of complex design flow channels and manufacturing of finned tubes with high heat exchange requirements, and has direct guiding significance for practical engineering application.
Drawings
FIG. 1 is a schematic view of a fin tube according to the present invention;
FIG. 2 is a schematic view of the internal structure of the finned tube of the present invention;
FIG. 3 is a schematic cross-sectional view of a finned tube according to the present invention;
FIG. 4 is a waveform diagram of a split electron beam welding of the present invention;
Reference numerals: 1. pressure-resistant pipe, 2, fin, 3, outer tube.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention is made clearly and completely with reference to the accompanying drawings.
As shown in the drawing, the finned tube comprises an internal pressure-resistant tube 1 and an external outer tube 3, wherein a plurality of fins 2 are uniformly arranged between the pressure-resistant tube 1 and the external tube 3 at intervals, the fins 2 are axially arranged along the pressure-resistant tube 1, the fins 2 are of hollow structures, the cross section of the external tube 3 is hexagonal, and the thickness and the length-width ratio of the fins are 1 mm-1.5 mm.
An electron beam welding process of a finned tube, wherein a pressure-resistant tube 1 of the finned tube and fins are integrally processed, and the welding process of the fins and an outer tube 3 mainly comprises the following steps:
Step one, cleaning the fin micro-channels by using solvents such as alcohol, acetone and the like, removing greasy dirt, and drying for later use;
Installing the finned tube into a vacuum electron beam welding machine, fixing the finned tube by utilizing a tool, adjusting the distance from the outer surface of the finned tube to an electron gun to be 600-1000 mm, detecting each welding system, closing a vacuum chamber furnace door after the detection is qualified, and opening a vacuum pump group to vacuumize;
Step three, after the vacuum degree is extracted to 1X 10 -2 Pa, adjusting the position of the workpiece to the lower part of the electron gun, and preparing for welding;
Determining three welding seams to be welded on each end face of an outer tube of the finned tube, performing beam-splitting electron beam welding on each end face of the finned tube according to the generated welding waveform diagram and an electron beam modeling program, and adopting a beam-splitting electron beam welding technology to realize one-time single-sided synchronous welding of the three welding seams, effectively controlling welding deformation and accurately positioning the welding seam position through the welding waveform diagram; the welding waveform is a triangular waveform, the size of the welding waveform is determined according to the positions of welding seams to be welded of the finned tube, the height of the welding waveform is A, the bottom width B of the welding waveform is the distance between two welding seams to be welded on the outer side, and A: b=1: 2, the triangle advancing direction is the welding direction;
According to the generated welding waveform diagram and the electron beam modeling program, each end face of the finned tube is subjected to beam-splitting electron beam welding, which mainly comprises electron beam spot welding, electron beam seal welding and electron beam welding, and specifically comprises the following steps:
Electron beam spot welding: opening an electron gun, starting an electron beam current, and performing intermittent spot welding on a weld joint to be welded on each end face of an outer tube by adopting a beam splitting electron beam according to a welding waveform diagram at intervals of 50mm, wherein the welding process comprises the following steps: the voltage is 150KV, the beam current is 0.5-5 mA, the speed is 800-1500 mm/min, and the scanning frequency F is as follows: 1-1000 HZ, graph amplitude range: 0.1-10 mm, and the treatment time is 1-100 s; the six faces are completely spot welded through a rotating tool;
Electron beam seal welding: and leveling the surface to be welded under a welding gun, and performing small beam welding by adopting a beam splitting electron beam according to a welding waveform diagram so as to achieve the aim of reducing the butt welding seam gap, wherein the welding process comprises the following steps: the voltage is 150KV, the beam current is 5-10 mA, the speed is 800-1500 mm/min, and the scanning frequency F is as follows: 1-1000 HZ, graph amplitude range: 0.1-10 mm;
Electron beam welding: and finally, carrying out pulse electron beam welding on the surface to be welded by adopting a beam splitting electron beam according to a welding oscillogram to achieve high depth-to-width ratio penetration and width and realize the connection of the fins and the outer tube, wherein the welding process comprises the following steps: the voltage is 150KV, the beam current is 10-30 mA, the speed is 800-1500 mm/min, and the scanning frequency F is: 1-1000 HZ, graph amplitude range: 0.1-10 mm;
After the six surfaces are respectively subjected to spot welding, positioning and formal welding of the six surfaces are sequentially performed;
And fifthly, after the electron beam welding of each surface is finished, cooling the finned tube (the temperature is reduced to below 100 ℃), deflating the vacuum chamber, opening the furnace door of the vacuum chamber, dismantling each system, taking out the finned tube, and finally forming the finned tube with a required structure.
While the basic principles, principal features and advantages of the present invention have been shown and described, it will be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, which are described in the foregoing description merely illustrate the principles of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111273185.XA CN113983850B (en) | 2021-10-29 | 2021-10-29 | Fin tube and electron beam welding process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111273185.XA CN113983850B (en) | 2021-10-29 | 2021-10-29 | Fin tube and electron beam welding process thereof |
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| CN113983850A CN113983850A (en) | 2022-01-28 |
| CN113983850B true CN113983850B (en) | 2024-04-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1762636A (en) * | 2004-10-22 | 2006-04-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Vacuum electron beam welding method for thin-walled titanium alloy assembly |
| CN2869738Y (en) * | 2005-12-21 | 2007-02-14 | 李建明 | Aluminium inner-finned-tube heat exchanger |
| CN102689089A (en) * | 2011-03-23 | 2012-09-26 | 通用汽车环球科技运作有限责任公司 | Beam welding of a multi-sheet work stack having a reduced thickness feature |
| CN103175429A (en) * | 2013-04-18 | 2013-06-26 | 南京工业大学 | Multidirectional corrugated inner finned tube |
| CN103946659A (en) * | 2011-11-08 | 2014-07-23 | 开利公司 | Heat exchanger and manufacturing method thereof |
| CN107649777A (en) * | 2017-08-01 | 2018-02-02 | 中国船舶重工集团公司第七二五研究所 | A kind of titanium alloy Needle fin tube electron beam preparation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014219853A1 (en) * | 2014-05-06 | 2015-11-26 | Mahle International Gmbh | Thermoelectric generator |
-
2021
- 2021-10-29 CN CN202111273185.XA patent/CN113983850B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1762636A (en) * | 2004-10-22 | 2006-04-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Vacuum electron beam welding method for thin-walled titanium alloy assembly |
| CN2869738Y (en) * | 2005-12-21 | 2007-02-14 | 李建明 | Aluminium inner-finned-tube heat exchanger |
| CN102689089A (en) * | 2011-03-23 | 2012-09-26 | 通用汽车环球科技运作有限责任公司 | Beam welding of a multi-sheet work stack having a reduced thickness feature |
| CN103946659A (en) * | 2011-11-08 | 2014-07-23 | 开利公司 | Heat exchanger and manufacturing method thereof |
| CN103175429A (en) * | 2013-04-18 | 2013-06-26 | 南京工业大学 | Multidirectional corrugated inner finned tube |
| CN107649777A (en) * | 2017-08-01 | 2018-02-02 | 中国船舶重工集团公司第七二五研究所 | A kind of titanium alloy Needle fin tube electron beam preparation method |
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| CN113983850A (en) | 2022-01-28 |
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