CN102699593B - Welding fixture for diffusion welding of dissimilar metal and welding method thereof - Google Patents
Welding fixture for diffusion welding of dissimilar metal and welding method thereof Download PDFInfo
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Abstract
The invention discloses a welding fixture for diffusion welding of dissimilar metals and a welding method thereof, wherein the welding fixture comprises an upper base plate (1), a lower base plate (2), a screw rod (3), a centering core rod (4) and a nut (5), the upper base plate (1) and the lower base plate (2) are completely the same in shape and are both disc-shaped structures, three uniformly distributed holes and a central hole are formed in each disc, the screw rod (3) is installed in the three uniformly distributed holes, both ends of the screw rod (3) are provided with thread structures, the nut (5) is matched with the thread structures, and the centering core rod (4) is installed in the central hole. The welding fixture for diffusion welding of dissimilar metals can meet the requirement of diffusion welding between sheet dissimilar metals, is simple in welding operation, can be applied to manufacturing of slow-wave system radiating fins of a ku waveband 100W air-cooled traveling wave tube, and can also be applied to diffusion welding between metals of annular structures.
Description
Technical field
The present invention relates to the outer establishment of component field of travelling-wave tubes pipe in microwave electrovacuum, especially relate to a kind of weld jig for different in nature metal diffusion welding (DW) and welding method thereof.
Background technology
Travelling-wave tubes is a kind of electron tube, and be a kind of microwave signal amplifying device, its structure comprises electron gun, slow wave system, collection level, delivery of energy structure and focusing structure etc.Its type of cooling can be divided into air-cooled, Conduction cooled and water-cooling structure, in air-cooled structure, needs to collect level to the position that its heat is maximum and slow wave system carries out high wind heat radiation.Collect level when designing and make, consider heat dissipation problem, problem is little.But because the strong magnetic of its outside need carries out the focusing of electron beam in slow wave system, general pure iron and the permanent magnet of adopting realizes focusing on, and radiator structure is difficult to realize in the design.In order to increase heat dispersion, sometimes adopting the excellent copper of heat conductivility to be inserted in pure iron and permanent magnet gap, sometimes adopting the mode of welding by copper and pure iron welding.Can ensure during welding that copper metal leads away the heat on pure iron faster, the welding manner often taked has soldering, brazing and diffusion welding.
Soldering is generally usually used in Conduction cooled, is welded on base plate by fin one section, simultaneously the fin other end and pure iron welding, and large to thermal shock around when shortcoming is welding, solder trickling is wayward.Soldering is fin and pure iron welded before slow-wave component assembling, and weld strength is good, and utilization rate is many, and shortcoming is that solder trickles and affects the assembly precision of magnetic sheet to Pure Iron Surface.Diffusion welding (DW) be by copper piece clip between pure iron, the external diameter of copper sheet is heat radiation laminated structure, is convenient to high wind heat radiation, often utilizes in air-cooled slow wave system, the internal diameter of copper sheet is identical with pure iron internal diameter, large with the contact area of pure iron, be beneficial to and derived by heat, advantage is open, do not affect fitted position, shortcoming is that different in nature metallic property.So is different, and the coefficient of expansion is different, is difficult to integrally welded.
Summary of the invention
Technical problem to be solved by this invention provides a kind of weld jig for different in nature metal diffusion welding (DW) and welding method thereof for problems of the prior art, its objective is by adopting certain weld jig, weld according to certain method, solve the problem that different in nature metal Diffusion Welding is difficult to weld, ensure the smooth enforcement of different in nature metal Diffusion Welding.
To be this kind comprise upper plate, lower shoe, screw rod, centering core bar and nut for the weld jig of different in nature metal diffusion welding (DW) to technical scheme of the present invention, described upper plate is identical with the shape of lower shoe, all disc-shaped structures, disk is provided with three equally distributed holes and a centre bore, screw rod is arranged in three equally distributed holes, and the two ends of screw rod are equipped with helicitic texture, described nut and this helicitic texture cooperatively interact, and described centering core bar is arranged in centre bore.
The material of described upper plate, lower shoe, screw rod and nut is the low-expansion metal molybdenum of high temperature.
On described screw rod, the length of every section of screw thread is all not less than 1/3 of screw rod total length.
Above-mentioned method of carrying out welding for the weld jig of different in nature metal diffusion welding (DW) is utilized to comprise:
1) by after the first metal of different in nature metal and the cleaning of the second metal of Diffusion Welding, assembled in 48 hours;
2) lower shoe is placed on base, centering core bar is inserted the centre bore of lower shoe, screw rod lower end is placed in the corresponding hole of lower shoe by nut;
3) by the first metal of Diffusion Welding and the second metal by the centering core bar of weld jig inside through being fixed on the lower shoe of weld jig successively, order repeats successively according to the order of the first metal, the second metal, the first metal, mica sheet;
4) upper plate is placed on by centering core bar on the different in nature metal and mica sheet put well; Screw rod is penetrated the hole of upper plate, and fixed by nut screwing clamping;
5) on upper plate, place a briquetting, briquetting applies certain pressure, screws the nut on three screw rods, cancel pressure, take off briquetting, take out centering core bar, the assembling of Diffusion Welding assembly can be completed;
6) weld jig of the Diffusion Welding assembly assembled is placed in firing equipment, by certain process curve heating and cooling, the Diffusion Welding of different in nature metal can be completed.
As a kind of detailed description of the invention of the present invention, the first metal is pure iron, and the second metal is copper, and wherein the built-up time of copper completes in 2 hours after cleaning.
When placing mica sheet, need to be coated with one deck alcohol, alumina powder mixture on the metal of its contact.
Formula relation between described alcohol, alumina powder is: the alumina powder of 4-5g needs the alcohol of 10ml, and any formula relation identical with this ratio.
Described process curve refers to that the welding heating and cooling process curve of copper and pure iron metal be programming rate is 5-60 DEG C/min, is incubated 20-40 minute, then cools with stove at 800-1200 DEG C.
More preferably, described programming rate is 12-40 DEG C/min, is incubated 30 ± 1 minutes, then cools with stove at 950 ± 20 DEG C.
This kind can meet the intermetallic diffusion welding (DW) of the sheet opposite sex for the weld jig of different in nature metal diffusion welding (DW), solve the problem of dissimilar metal welding difficulty, welding operation is simple, can be applied in the slow wave system fin making of the air-cooled travelling-wave tubes of ku wave band 100W, can also be applied in the intermetallic Diffusion Welding of circulus.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of upper and lower base plate in the present invention.
Fig. 3 is the structural representation of the weld jig assembling different in nature metal to be welded.
Fig. 4 is that single Diffusion Welding component part places sequential schematic.
In figures 1-4,1: upper plate; 2: lower shoe; 3: screw rod; 4: centering core bar; 5: nut; 6: pure iron; 7: copper; 8: mica sheet; 9: base; 10: briquetting.
Detailed description of the invention
From structure shown in Fig. 1-2, this kind comprises upper plate 1, lower shoe 2, screw rod 3, centering core bar 4 and nut 5 for the weld jig of different in nature metal diffusion welding (DW), upper plate 1 is identical with the shape of lower shoe 2, all disc-shaped structures, disk is provided with three equally distributed holes and a centre bore, and screw rod 3 is arranged in three equally distributed holes, and the two ends of screw rod 3 are equipped with helicitic texture, nut 5 and this helicitic texture cooperatively interact, and centering core bar 4 is arranged in centre bore.
The material of upper plate 1, lower shoe 2, screw rod 3 and nut 5 is the low-expansion metal molybdenum of high temperature.On screw rod 4, the length of every section of screw thread is all not less than 1/3 of screw rod 4 total length.
From structure shown in Fig. 1-4, above-mentioned method of carrying out welding for the weld jig of different in nature metal diffusion welding (DW) is utilized to comprise:
1) by after the first metal 6 of different in nature metal of Diffusion Welding and the second metal 7 clean, assembled in 48 hours;
2) lower shoe 2 is placed on base 9, centering core bar 4 is inserted the centre bore of lower shoe 2, screw rod 3 lower end is screwed by nut 5 and is placed in the corresponding hole of lower shoe 2;
3) by the first metal 6 of Diffusion Welding and the second metal 7 by the centering core bar 4 of weld jig inside through being fixed on the lower shoe 2 of weld jig successively, order repeats successively according to the order of the first metal 6, the second metal 7, the first metal 6, mica sheet 8;
4) upper plate 1 is placed on by centering core bar 4 on the different in nature metal and mica sheet 8 put well; Screw rod 3 is penetrated the hole of upper plate 1, and tighten fixing by nut 5;
5) on upper plate 1, place a briquetting 10, briquetting 10 applies certain pressure, screws the nut 5 on three screw rods 3, cancel pressure, take off briquetting 10, take out centering core bar 4, the assembling of Diffusion Welding assembly can be completed;
6) weld jig of the Diffusion Welding assembly assembled is placed in firing equipment, by certain process curve heating and cooling, here process curve refers to that the welding heating and cooling process curve of copper and pure iron metal be programming rate is 5-60 DEG C/min, at 800-1200 DEG C, be incubated 20-40 minute, then cool with stove.
More preferably, programming rate is 12-40 DEG C/min, at 950 ± 20 DEG C, be incubated 30 ± 1 minutes, then with stove cooling, can complete the Diffusion Welding of different in nature metal.
As a kind of specific embodiment of the present invention, the first metal 6 is pure iron, and the second metal 7 is copper, and wherein the built-up time of Copper and its alloy completes in 2 hours after cleaning.
When placing mica sheet 8, need to be coated with one deck alcohol, alumina powder mixture on the metal of its contact.Formula relation between alcohol, alumina powder is: the alumina powder of 4-5g needs the alcohol of 10ml, and any formula relation identical with this ratio.
In the present invention, the processing technology requirement of each structure is:
The processing of upper and lower base plate: material is high temperature low-expansion coefficient metal molybdenum, disc-shaped structure, and be holding structure intensity, thickness is greater than 12mm; Disk has three equally distributed holes and a centre bore, and equally distributed hole is the position of screw rod 3, and centre bore is the position of centering core bar 4.
The processing of screw rod: material is high temperature low-expansion coefficient metal molybdenum, screw rod 3 is through three holes of base plate, and external diameter is smaller, and two sections of screw rod 3 are helicitic texture, and the length of helicitic texture is all not less than 1/3 of overall length; Screw rod 3 is three, and all there is nut 5 at every root two ends.
The processing of centering core bar: material is stainless steel 1Cr18Ni9Ti, elongate rod structure, external diameter is more smaller than the centre bore of upper and lower base plate, and concrete size, can through the centre bore of weld metal sheet with reference to the centre bore of weld metal.
This kind can meet the intermetallic diffusion welding (DW) of the sheet opposite sex for the weld jig of different in nature metal diffusion welding (DW), welding operation is simple, can be applied in the slow wave system fin making of the air-cooled travelling-wave tubes of ku wave band 100W, can also be applied in the intermetallic Diffusion Welding of circulus.
Claims (7)
1. one kind utilizes the weld jig being used for different in nature metal diffusion welding (DW) to carry out welding method, described weld jig comprises upper plate (1), lower shoe (2), screw rod (3), centering core bar (4) and nut (5), described upper plate (1) is identical with the shape of lower shoe (2), all disc-shaped structures, disk is provided with three equally distributed holes and a centre bore, screw rod (3) is arranged in three equally distributed holes, and the two ends of screw rod (3) are equipped with helicitic texture, described nut (5) and this helicitic texture cooperatively interact, described centering core bar (4) is arranged in centre bore, it is characterized in that: described welding method comprises:
1) by after the first metal of different in nature metal (6) and the second metal (7) cleaning of Diffusion Welding, assembled in 48 hours;
2) lower shoe (2) is placed on base (9), centering core bar (4) is inserted the centre bore of lower shoe (2), screw rod (3) lower end is screwed by nut (5) and is placed in the corresponding hole of lower shoe (2);
3) by the first metal (6) of Diffusion Welding and the second metal (7) by the centering core bar (4) of weld jig inside through being fixed on the lower shoe (2) of weld jig successively, order repeats successively according to the order of the first metal (6), the second metal (7), the first metal (6), mica sheet (8);
4) upper plate (1) is placed on by centering core bar (4) on the different in nature metal and mica sheet (8) put well; Screw rod (3) is penetrated the hole of upper plate (1), and tighten fixing by nut (5);
5) the upper placement briquetting (10) of upper plate (1), at the pressure that the upper applying of briquetting (10) is certain, screw the nut (5) on three screw rods (3), cancel pressure, take off briquetting (10), take out centering core bar (4), the assembling of Diffusion Welding assembly can be completed;
6) weld jig of the Diffusion Welding assembly assembled is placed in firing equipment, by certain process curve heating and cooling, the Diffusion Welding of different in nature metal can be completed.
2. welding method according to claim 1, is characterized in that: the material of described upper plate (1), lower shoe (2), screw rod (3) and nut (5) is the low-expansion metal molybdenum of high temperature.
3. welding method according to claim 1, is characterized in that: the first metal (6) is pure iron, and the second metal (7) is copper, and wherein the built-up time of copper completes in 2 hours after cleaning.
4. the welding method according to claim 1 or 3, is characterized in that: when placing mica sheet (8), needs to be coated with one deck alcohol, alumina powder mixture on the metal of its contact.
5. welding method according to claim 4, is characterized in that: the formula relation between described alcohol, alumina powder is: the alumina powder of 4-5g needs the alcohol of 10ml.
6. welding method according to claim 5, it is characterized in that: described process curve refers to the welding heating and cooling process curve of copper and pure iron metal, this welding heating and cooling process curve is programming rate is 5-60 DEG C/min, is incubated 20-40 minute, then cools with stove at 800-1200 DEG C.
7. welding method according to claim 6, is characterized in that: described programming rate is 12-40 DEG C/min, is incubated 30 ± 1 minutes, then cools with stove at 950 ± 20 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210151159.4A CN102699593B (en) | 2012-05-16 | 2012-05-16 | Welding fixture for diffusion welding of dissimilar metal and welding method thereof |
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| CN201210151159.4A CN102699593B (en) | 2012-05-16 | 2012-05-16 | Welding fixture for diffusion welding of dissimilar metal and welding method thereof |
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| CN102699593B true CN102699593B (en) | 2015-04-22 |
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| CN102756205B (en) * | 2012-07-13 | 2015-08-26 | 安徽华东光电技术研究所 | Clamp for diffusion welding and using method thereof |
| CN103753041A (en) * | 2014-01-07 | 2014-04-30 | 江苏银河电子股份有限公司 | Method for welding hoop with screw |
| CN105328328B (en) * | 2015-10-12 | 2017-03-29 | 中国石油大学(华东) | A kind of metal double polar plates superplastic diffusion bonding technique |
| CN105598619B (en) * | 2016-01-22 | 2017-09-19 | 哈尔滨工业大学（威海） | Al in one kind welding artificial retina2O3The fixture of ceramics and titanacycle |
| CN106808078B (en) * | 2017-01-11 | 2019-05-24 | 首都航天机械公司 | A kind of diffusion welding method of dissimilar metal |
| CN107838635B (en) * | 2017-10-17 | 2019-03-22 | 陕西智拓固相增材制造技术有限公司 | The processing method of pallet grippers |
| CN109807455A (en) * | 2019-03-12 | 2019-05-28 | 广东省焊接技术研究所（广东省中乌研究院） | A kind of diffusion welding method of diffusion welding (DW) fixture and cupro-nickel composite sheet |
| CN111162325A (en) * | 2019-11-14 | 2020-05-15 | 浙江安力能源有限公司 | Hot-pressing sealing tool |
| CN115121929A (en) * | 2022-06-29 | 2022-09-30 | 中国科学院金属研究所 | Vacuum electron beam packaging method for preventing cracking of difficult-to-weld metal |
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