CN1065616A - Continuously pressurizing and heating non-protective atomsphere diffusion welding process - Google Patents
Continuously pressurizing and heating non-protective atomsphere diffusion welding process Download PDFInfo
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- CN1065616A CN1065616A CN 91102375 CN91102375A CN1065616A CN 1065616 A CN1065616 A CN 1065616A CN 91102375 CN91102375 CN 91102375 CN 91102375 A CN91102375 A CN 91102375A CN 1065616 A CN1065616 A CN 1065616A
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- welding
- diffusion welding
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- atomsphere
- diffusion
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Abstract
The invention discloses a kind of continuously pressurizing and heating non-protective atomsphere diffusion welding process, it comprises: a. prepares on the surface, promptly makes face of weld reach certain fineness by machining, and cleans face of weld with chemical method; B. put into the welding booth after the two solder side driving fits, and the secondary two ends of welding are fixed; C. raising temp and loading; D. insulation.Feature of the present invention is: after the two solder side driving fits, add first pressing P
0, P
0Be generally 6MPa～10MPa, the welding booth is an open type, the intensification Diffusion Welding of promptly pressurizeing continuously in air.Advantage of the present invention is: simplified the technology of vacuum diffusion welding greatly, reduced equipment investment, shortened the production cycle, enlarged the material scope of application.
Description
The present invention relates to Diffusion Welding and especially relate to the continuously pressurizing and heating non-protective atomsphere diffusion welding new technology.
The Diffusion Welding technology is that a kind of advanced person's of growing up mid-term of twentieth century material connects and joint method.Its direct pushing factor that produces with development be high-tech sectors such as hyundai electronics, atomic energy, aviation and aerospace to new material and with the requirement of new material materials processing new method of equal importance.Thereby for a long time, be mainly used in these industrial guide departments.Because the composite and the structure of this technology manufacturing have high-quality, high accuracy, do not damage material property, and be subjected to characteristics such as material restriction hardly.In recent years, begun to be generalized to common mechanical process industry department abroad, the someone foretells that Diffusion Welding will become the most effective joint method under the condition of cosmic space.
According to present diffusion welding (DW) development, it can be divided into the diffusion welding (DW) that adds intermediate diffusion layer and not add intermediate diffusion layer and diffusion welding (DW), and they comprise gas shield diffusion welding (DW), vacuum diffusion welding, solvent protection diffusion welding (DW).Existing diffusion technology for welding all carries out under vacuum or protective atmosphere." metal solder handbook " P327 of International Industry publishing house publication in 1988 mentions: surfacecti proteon is considered to measures necessary.If allow to stain once more with post processing the time, it is non-remunerative that the energy that then costs a lot of money before diffusion welding (DW) carries out the surface preparation.The measure that solves this potential challenges is when diffusion welding (DW) environment effectively to be protected.Protection when the vacuum protection during diffusion welding (DW) is prepared with the surface is the same, can continue to break away from contamination.Protective atmosphere when doing diffusion welding (DW) with hydrogen, the quantity of the oxide that generates when helping to make welding reduces to minimum, and can reduce existing oxide.But, in titanium, zirconium, hafnium, niobium and tantalum alloy, will generate hydride, may be unfavorable to welding performance.Argon, helium and nitrogen at high temperature can be protected clean surface.When using these inert gases, their purity must be high.Be applicable to the many precautionary measures and the principle of soldering atmosphere, all can be directly used in diffusion welding (DW).
The diffusion welding craft of vacuum or protective atmosphere; be generally: 1. prepare on the surface, 1. by mechanical grinding, grinds; or polishing makes the surface of desire welding reach certain surface smoothness; glacing flatness and smoothness, distortion that need not be big with assurance just can make its interface reach needed uniformity, 2. pickling; usually adopt chemical method corrosion or pickling before the weldering; its main purpose is: remove lip-deep non-metallic film, modal is oxide, cleaning part or removing surface cool machined layer.3. alcohol is used in oil removing, and trichloro-ethylene acetone or washing agent carry out surface degreasing; 2. after the two solder side driving fits, put into airtight welding booth, and welding pair two ends are fixed, the welding booth is evacuated to 10
-3-10
-5Torr or charge into inert gas; 3. raising temp and loading, Diffusion Welding temperature are generally in two kinds of materials 0.6～0.8T than low melting material
M(T
MBe fusing point).Load mode can be divided into and add dead load or the pressurization of expanding, i.e. welding is paid two ends and fixed, and utilizes to expand when heating up and pressurize.Pressure is the important parameter of diffusion welding (DW), can in very large range change, and is changed in 276MPa by 4MPa.4. insulation is according to material and different being generally 10～30 minutes also has a few hours of reaching.Because Diffusion Welding needs to work under the protective atmosphere of vacuum or strictness; not only production efficiency is low; and the size of restriction welding work pieces; because of weld size when big; the corresponding increase of vacuum welding fitting; the vacuum seal difficulty increases, and evacuated time increases, and has therefore limited the application of Diffusion Welding technology in industry.
The purpose of this invention is to provide a kind of continuously pressurizing and heating non-protective atomsphere diffusion welding and connect new technology.
Technology of the present invention is: 1. prepare on the surface, 1. by the machinery pressurization, makes solder side reach certain fineness, to steel-copper, and aluminium-aluminium △
6Get final product, 2. do not carry out pickling, but with metal cleaner the surface of desire welding is scrubbed, dichloroethanes is used in then water flushing at last, and acetone or trichloro-ethylene clean; 2. the welding booth was put in driving fit immediately after two solders side cleaned, and added first pressing P
0, P
0Be generally 6MPa～10MPa, and welding pair two ends are fixed.3. raising temp and loading, The faster the better for programming rate, and the incipient stage is generally 100 ℃/min, makes pressure by P owing to expanding during intensification
0Rising reaches maximum P
MAfter, because of making pressure, plastic deformation is reduced to P
t(P
tTemperature for welding), welding temperature is 0.6～0.8T
Mo4. insulation is 10-30 minute.
Up to now, people mainly from the thermodynamic stability of surface film oxide, reach oxide-film desorb, reduction or stop its continued growth by control vacuum or protective atmosphere.But under common vacuum or protective atmosphere diffusion welding (DW) condition, (vacuum 10
-4～10
-5Torr).Vacuum or protective atmosphere are all venerated can stop the further oxidation in metal surface; Diffusion welding (DW) remains being coated with to be carried out between the oxide-film surface; the present invention is from this fundamemtal phenomena; mechanical instability according to surface film oxide; (causing) by rough surface peak flow or thermal expansion; and surperficial automatically cleaning principle; promptly Feng Bi inner surface can make the conception of oxide-film disappearance by the reduction of diffusion or alloying element, has proposed the continuously pressurizing and heating non-protective atomsphere diffusion welding new technology.
New technology is by the surface clean of 1. strictnesses, and promptly metal cleaner is scrubbed-washed-acetone or the last pretreating process that cleans of dichloroethanes; 2. combine by adding precompressed and expanding to pressurize, realize pressurization continuously, both protected the further oxidation of two solders side, accelerating oxidation film mechanical instability increases and increases real contact area realization Diffusion Welding again.
Embodiment:
Copper-steel diffusion welding (DW)
Welding work pieces size: steel loop external diameter φ 48mm, internal diameter φ 18mm, high 50mm.
Copper ring external diameter φ 48mm, internal diameter φ 18mm, high 30mm.
Surface Machining condition: steel loop, finish turning
Copper ring, finish turning
Steel loop, copper ring surface preparation program is as follows, with metal cleaner scrub-water washes-finally cleans with acetone or dichloroethanes.
Should carry out Diffusion Welding immediately after steel loop, the copper ring surface preparation.
Temperature T
MBe 900 ℃, the time is 30 minutes, precompressed 10N/mm
2, peak pressure P
M42N/mm
2, P
t3.8N/mm
2, copper-steel interface bond strength is 170N/mm
2, percentage elongation δ is 17.1%, reaches the strength level of vacuum diffusion welding.
Applicating new process is also realized the Diffusion Welding of following combination of materials.
1. aluminium-aluminium, tensile strength sigma=35N/mm
2, be better than vacuum diffusion welding.
2. steel-steel, tensile strength sigma=410N/mm
2, reach the vacuum diffusion welding level.
3. copper-copper, tensile strength sigma=110N/mm
2, near the vacuum diffusion welding level.
Advantage of the present invention is: 1. the technology of greatly having simplified vacuum diffusion welding is not equipped with complicated vacuum system, thereby has shortened the cost that the production cycle has reduced equipment investment or transformation yet. 2. the bigger material scope of application is arranged, can realize the Diffusion Welding of multiple material and combination thereof, such as aluminium-aluminium system, steel-copper system, steel-steel system, copper-copper system, copper-silicon system etc. 3. those are contained the material of vacuum volatilization constituent element such as brass (Cu-Zn, Zn has vacuum volatilization) etc., have bigger potential practical value.
Claims (2)
1, a kind of continuously pressurizing and heating non-protective atomsphere diffusion welding process, it comprises:
A. prepare on the surface, makes face of weld reach certain fineness by machining, and clean face of weld with chemical method;
B. put into the welding booth after the two solder side driving fits, and welding pair two ends are fixed;
C. raising temp and loading, welding temperature are generally in two kinds of materials 0.6～0.8T than low melting material
M(T
MBe fusing point) owing to expand pressure is raise when heating up, to maximum P
MAfter, because of making pressure, plastic deformation is reduced to P
t, (P
tPressure when being welding);
D. insulation generally is incubated 10～30 minutes;
It is characterized in that:
E. after the two solder side driving fits, add first pressing P among the said b
0, P
0Be generally 6MPa～10MPa, the welding booth is an open type;
2, a kind of continuously pressurizing and heating non-protective atomsphere diffusion welding process according to claim 1 is characterized in that:
F. the chemical method among the said a is with metal cleaner the surface of desire welding to be scrubbed, and then, dichloroethanes is used in the water flushing at last, and acetone or trichloro-ethylene clean;
G. programming rate among the said c, general 100 ℃/min of incipient stage, the pressure P t during welding is 25MPa～45MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102375 CN1065616A (en) | 1991-04-12 | 1991-04-12 | Continuously pressurizing and heating non-protective atomsphere diffusion welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102375 CN1065616A (en) | 1991-04-12 | 1991-04-12 | Continuously pressurizing and heating non-protective atomsphere diffusion welding process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1065616A true CN1065616A (en) | 1992-10-28 |
Family
ID=4905564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91102375 Pending CN1065616A (en) | 1991-04-12 | 1991-04-12 | Continuously pressurizing and heating non-protective atomsphere diffusion welding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1065616A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103567624A (en) * | 2013-11-05 | 2014-02-12 | 南京三乐电子信息产业集团有限公司 | Welding method for composite cavity sheets of high-power coupled-cavity traveling-wave tube |
| CN112388144A (en) * | 2020-10-28 | 2021-02-23 | 中国电子科技集团公司第三十八研究所 | Precise diffusion welding method for millimeter wave waveguide antenna |
-
1991
- 1991-04-12 CN CN 91102375 patent/CN1065616A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103567624A (en) * | 2013-11-05 | 2014-02-12 | 南京三乐电子信息产业集团有限公司 | Welding method for composite cavity sheets of high-power coupled-cavity traveling-wave tube |
| CN103567624B (en) * | 2013-11-05 | 2015-08-05 | 南京三乐电子信息产业集团有限公司 | The welding method of the Compound Cavity sheet of high-power coupled-cavity TWT |
| CN112388144A (en) * | 2020-10-28 | 2021-02-23 | 中国电子科技集团公司第三十八研究所 | Precise diffusion welding method for millimeter wave waveguide antenna |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |