CN103737137A - Welding method for high-energy ignition device of aero-engine - Google Patents
Welding method for high-energy ignition device of aero-engine Download PDFInfo
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- CN103737137A CN103737137A CN201310653541.XA CN201310653541A CN103737137A CN 103737137 A CN103737137 A CN 103737137A CN 201310653541 A CN201310653541 A CN 201310653541A CN 103737137 A CN103737137 A CN 103737137A
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention relates to a welding method for a high-energy ignition device of an aero-engine. Chemical nickel-plating is conducted on the surface of an aluminium alloy part, wetting and combining of brazing filler metal and base metal are guaranteed, and it is guaranteed that welding can be conducted effectively. Multiple kinds of welding modes are combined, so that the difficult problems that operation space is small, and welding can not be conducted are solved, the shielding performance of the high-energy ignition device is guaranteed, welding deformation of aluminium alloy thin sheets is effectively controlled, operation can be conducted in narrow space conveniently, and it is guaranteed that a high-energy ignition coil is not burnt in the welding process. The difficult problem of aluminium tin soldering and brazing is well solved, and the special requirement for electromagnetic shielding of the high-energy ignition device can be met.
Description
Technical field
The present invention relates to a kind of welding method, especially a kind of welding method of aero-engine high energy ignition unit.
Background technology
Since the establishment of the nation, the aero-engine igniter of China is all copied former Soviet Union's prototype design, what adopt is all platinum contact point sparking mode, the housing of whole device and lid are all to adopt aluminium alloy casting, thickness is in 3～5mm left and right, weight is not more than 3.35Kg, and appearance and size is 246mm * 184mm * 126mm.Between housing and lug plate, adopt the mode of riveted joint, what the last assembling of housing and lid adopted is bolted mode, and the connector of whole device and aero-engine has plenty of the mode that adopts argon arc welding.The each igniting in platinum contact all can have scaling loss, igniting often after, platinum contact will attenuation, the gap of upper and lower contact point will become greatly, thereby affect ignition performance, therefore needs frequent adjusting play and replacing contact point, the life-span is short, functional reliability is bad; Meanwhile, the state on platinum contactor igniter butt contact surface and some fire environment around have higher requirement, and contact point surface is dirty, surrounding environment is poor all can affect its ignition performance.In recent years, along with the continuous appearance of type aircraft and engine, also more and more higher to the requirement of igniter, and high energy ignition unit is exactly one of them.What high energy ignition unit adopted is the mode of high energy coil igniting, weight for alleviator, the housing of whole igniter and lid adopt is that the Welding of Aluminium Alloy Sheet Structure of 1.2～1.5mm thickness forms, whole igniter be included on housing, arrange with the column of outside coupling part, mounting points fire coil and circuit board, housing on the wire output mouth that arranges and Connection Block, injection soldering and sealing material soldering and sealing pipe and enclosure interior setting for shielding the shielding box of high energy coil.The weight of high energy ignition unit is not more than 1.1Kg, and appearance and size is 106mm * 88mm * 55mm, therefore has lightweight, volume is little, and the life-span is long, and reliability is high, the feature that starting time is fast, this igniter extremely still can normally worked under rugged environment simultaneously.Yet novel high energy ignition unit requires the electromagnetic wave shielding of ignition coil to get well, and the shielding box of enclosure interior and screening cover are wanted whole soldering and sealing.And these soldering and sealing complete will high energy ignition coil and circuit board be housed in enclosure interior and shielding box inside in the situation that, therefore to guarantee in soldering and sealing process, the high energy ignition coil that is arranged on device inside is not burnt.Guarantee that the temperature that high energy ignition coil is not burnt is 70 ℃, while that is to say the soldering and sealing of housing and shielding box, the temperature of high energy ignition coil can not surpass 70 ℃, and comparatively reasonable manner is to adopt solder, i.e. aluminium alloy tin brazing mode at present.Yet, between aluminium alloy, adopt the mode difficulty of tin soldering very large, its reason is because have one deck fusing point up to the di-aluminium trioxide film of 2050 degree in aluminum alloy surface, is difficult to remove, when room temperature, the thicknesses of layers of alundum (Al2O3) is 5nm left and right, under brazing temperature, thicknesses of layers sharply increases to 100～200nm, simultaneously, after this film adopts mechanical means to remove, can after 0.02s, generate rapidly, hinder the wetting and combination of solder and mother metal.The current domestic a kind of method that there is no aluminium alloy tin soldering of maturation.Meanwhile, due to the housing of high energy ignition unit and the wall thickness of lid thinner, controlling welding deformation is also one of difficult point of welding.
Summary of the invention
The welding method that the object of this invention is to provide a kind of aero-engine high energy ignition unit; solve the difficult point of aluminium alloy tin soldering; guarantee the soldering and sealing quality of Al-alloy casing and lid; and in welding process, protect ignition coil not to be subject to fire damage, and reach the object of the electromagnetic shielding of high energy ignition unit.
Specific embodiment of the invention method is that described welding method comprises the following steps:
1) all aluminum alloy parts of tin soldering that need are carried out to chemical nickel plating on surface, described chemical nickel plating on surface is undertaken by following work step:
A) clean: part is soaked 8～12 minutes with No. 180 gasoline, after taking out, with clean banister brush, clean up and naturally dry;
B) electrochemical deoiling: part is put into composition is NaOH 8～12 grams per liters, sodium phosphate 40～50 grams per liters, sodium metasilicate 25～35 grams per liters, sodium carbonate 20～30 grams per liters, all the other soak 3～5 minutes for the solution of water, soaking temperature is 60～70 ℃;
C) alkali etch: part is put into composition is NaOH 40～60 grams per liters, all the other are in the solution of water 0.5～1 minute, soaking temperature is 50～60 ℃;
D) acid etch: part is put into composition is 500 milliliters/liter, nitric acid, all the other are in the solution of water 10～15 seconds, soaking temperature is room temperature;
E) soak for the first time zinc: part is put in the solution that composition is NaOH 400～600 grams per liters, zinc oxide 80～120 grams per liters, rocchelle's salt 15～25 grams per liters, ferric trichloride 1～2 grams per liter, all the other are water 0.5～1 minute, and temperature is room temperature;
F) soak for the second time zinc: part is put in the solution that composition is NaOH 400～600 grams per liters, zinc oxide 80～120 grams per liters, rocchelle's salt 15～25 grams per liters, ferric trichloride 1～2 grams per liter, sodium nitrate 0.8～1.2 grams per liter, all the other are water 0.5～1 minute, and temperature is room temperature;
G) surface is adjusted: part is put in the solution that composition is sodium acid carbonate 40～60 grams per liters, all the other are water 10～15 minutes, and temperature is room temperature;
H) chemical nickel plating: part is put in the solution that composition is nickelous sulfate 25～30 grams per liters, dibastic sodium phosphate 20～25 grams per liters, sodium acetate 15～25 grams per liters, winestone carbon 8～12 grams per liters, 12～17 milliliters/liter of complexing agents, stabilizing agent 0.001～0.002 grams per liter, all the other are water 40～60 minutes, and temperature is 90～94 ℃;
It is that the hot water of 60～80 ℃ and normal-temperature water are cleaned to air-dry after piece surface noresidue solution that above-described all work steps finish the rear water temperature of all carrying out;
2) after the place to be welded of all parts being tried totally with absolute alcohol wiping, dry;
3), by after all assembling parts, place to be welded is preheated to 50～60 ℃;
4) welding: order and the mode of welding are as shown in the table:
In above-described stove, in tin soldering step, the temperature of implementing should be over 300 ℃; The temperature that gas brazing is implemented should be higher than 600 ℃; Before shielding box welding, high energy ignition coil is installed, mounting circuit boards before housing soldering and sealing;
5) final inspection.
In described step 3), the firing equipment adopting can be heat gun; In described step 4), in all welding processes, the temperature of monitoring housing any point should be over 70 ℃; The mode of monitoring can adopt infrared radiation thermometer.
The present invention, by before welding, carries out chemical nickel plating on aluminum alloy part surface, effectively prevents from generating alundum (Al2O3) rete in aluminum alloy surface, has guaranteed the wetting and combination of solder and mother metal, has guaranteed effectively carrying out of welding; By multiple welding manner, combine, and the high part of high-temperature soldering mode welding requirements intensity is first carried out in employing, temperature welding manner of the rear end is controlled welding deformation, by the mode of furnace brazing, solve that operating space is little, a difficult problem that cannot welding, guaranteed the shielding of high energy ignition unit, effectively control thin plate aluminum alloy welding deformation amount, and be convenient to operate at narrow space; Meanwhile, control the temperature of welding, and the temperature of housing is monitored, ignition coil is not burnt in welding process, guaranteed the functional reliability of igniter.The present invention has well solved a difficult problem for aluminium alloy tin soldering, can meet the specific (special) requirements of high energy ignition unit to electromagnetic shielding.
The specific embodiment
The welding method of aero-engine high energy ignition unit, its concrete steps are:
1) all aluminum alloy parts of tin soldering that need are carried out to chemical nickel plating on surface, described chemical nickel plating on surface is undertaken by following work step:
A) clean: part is soaked 8～12 minutes with No. 180 gasoline, after taking out, with clean banister brush, clean up and naturally dry;
B) electrochemical deoiling: part is put into composition is NaOH 8～12 grams per liters, sodium phosphate 40～50 grams per liters, sodium metasilicate 25～35 grams per liters, sodium carbonate 20～30 grams per liters, all the other soak 3～5 minutes for the solution of water, soaking temperature is 60～70 ℃;
C) alkali etch: part is put into composition is NaOH 40～60 grams per liters, all the other are in the solution of water 0.5～1 minute, soaking temperature is 50～60 ℃;
D) acid etch: part is put into composition is 500 milliliters/liter, nitric acid, all the other are in the solution of water 10～15 seconds, soaking temperature is room temperature;
E) soak for the first time zinc: part is put in the solution that composition is NaOH 400～600 grams per liters, zinc oxide 80～120 grams per liters, rocchelle's salt 15～25 grams per liters, ferric trichloride 1～2 grams per liter, all the other are water 0.5～1 minute, and temperature is room temperature;
F) soak for the second time zinc: part is put in the solution that composition is NaOH 400～600 grams per liters, zinc oxide 80～120 grams per liters, rocchelle's salt 15～25 grams per liters, ferric trichloride 1～2 grams per liter, sodium nitrate 0.8～1.2 grams per liter, all the other are water 0.5～1 minute, and temperature is room temperature;
G) surface is adjusted: part is put in the solution that composition is sodium acid carbonate 40～60 grams per liters, all the other are water 10～15 minutes, and temperature is room temperature;
H) chemical nickel plating: part is put in the solution that composition is nickelous sulfate 25～30 grams per liters, dibastic sodium phosphate 20～25 grams per liters, sodium acetate 15～25 grams per liters, winestone carbon 8～12 grams per liters, 12～17 milliliters/liter of complexing agents, stabilizing agent 0.001～0.002 grams per liter, all the other are water 40～60 minutes, and temperature is 90～94 ℃;
It is that the hot water of 60～80 ℃ and normal-temperature water are cleaned to air-dry after piece surface noresidue solution that above-described all work steps finish the rear water temperature of all carrying out;
2) after the place to be welded of all parts being tried totally with absolute alcohol wiping, dry;
3), by after all assembling parts, place to be welded is preheated to 50～60 ℃;
4) welding: order and the mode of welding are as shown in the table:
In above-described stove, in tin soldering step, the temperature of implementing should be over 300 ℃; The temperature that gas brazing is implemented should be higher than 600 ℃; Before shielding box welding, high energy ignition coil is installed, mounting circuit boards before housing soldering and sealing;
5) final inspection.
Embodiment mono-
Certain aircraft high energy ignition unit, product type is DHZ-119, the concrete steps of its welding are:
1) all aluminum alloy parts of tin soldering that need are carried out to chemical nickel plating on surface, described chemical nickel plating on surface is undertaken by following work step:
A) clean: part is soaked 10 minutes with No. 180 gasoline, after taking out, with clean banister brush, clean up and naturally dry;
B) electrochemical deoiling: part is put into composition is 10 grams per liters, sodium phosphate 18 grams per liters, sodium metasilicate 31 grams per liters, sodium carbonate 24 grams per liters, all the other soak 3 minutes for the solution of water, soaking temperature is 70 ℃;
C) alkali etch: part is put into composition is NaOH 60 grams per liters, all the other are in the solution of water 0.8 minute, soaking temperature is 60 ℃;
D) acid etch: part is put into composition is 500 milliliters/liter, nitric acid, all the other are in the solution of water 12 seconds, soaking temperature is room temperature;
E) soak for the first time zinc: part is put in the solution that composition is NaOH 500 grams per liters, zinc oxide 100 grams per liters, rocchelle's salt 20 grams per liters, ferric trichloride 2 grams per liters, all the other are water 0.8 minute, and temperature is room temperature;
F) soak for the second time zinc: part is put in the solution that composition is NaOH 500 grams per liters, zinc oxide 100 grams per liters, rocchelle's salt 20 grams per liters, ferric trichloride 2 grams per liters, sodium nitrate 1 grams per liter, all the other are water 0.8 minute, and temperature is room temperature;
G) surface is adjusted: part is put in the solution that composition is sodium acid carbonate 50 grams per liters, all the other are water 0.6 minute, and temperature is room temperature;
H) chemical nickel plating: part is put in the solution that composition is nickelous sulfate 28 grams per liters, dibastic sodium phosphate 25 grams per liters, sodium acetate 25 grams per liters, winestone carbon 10 grams per liters, 15 milliliters/liter of complexing agents, stabilizing agent 0.001 grams per liter, all the other are water 50 minutes, and temperature is 94 ℃;
It is that the hot water of 70 ℃ and normal-temperature water are cleaned to air-dry after piece surface noresidue solution that above-described all work steps finish the rear water temperature of all carrying out;
2) after the place to be welded of all parts being tried totally with absolute alcohol wiping, dry;
3), by after all assembling parts, with heat gun, place to be welded is preheated to 60 ℃;
4) welding: order and the mode of welding are as shown in the table:
In the above stove, in tin soldering step, the maximum temperature of implementing is 280 ℃; Before shielding box welding, high energy ignition coil is installed, mounting circuit boards before housing soldering and sealing.In all welding processes, the temperature with infrared radiation thermometer monitoring housing any point, is all no more than 70 ℃;
5) final inspection.Igniter shielding is up to standard, and high energy ignition coil ignition function meets the demands, and it is qualified to install.
Claims (5)
1. a welding method for aero-engine high energy ignition unit, is characterized in that, described method comprises the following steps:
1) all aluminum alloy parts of tin soldering that need are carried out to chemical nickel plating on surface;
2) after the place to be welded of all parts being tried totally with absolute alcohol wiping, dry;
3), by after all assembling parts, place to be welded is preheated to 50～60 ℃;
4) welding: order and the mode of welding are as shown in the table:
In above-described stove, in tin soldering step, the temperature of implementing should be over 300 ℃; The temperature that gas brazing is implemented should be higher than 600 ℃; Before shielding box welding, high energy ignition coil is installed, mounting circuit boards before housing soldering and sealing;
5) final inspection.
2. the welding method of aero-engine high energy ignition unit as claimed in claim 1, is characterized in that, described chemical nickel plating on surface is undertaken by following work step:
1) clean: part is soaked 8～12 minutes with No. 180 gasoline, after taking out, with clean banister brush, clean up and naturally dry;
2) electrochemical deoiling: part is put into composition is NaOH 8～12 grams per liters, sodium phosphate 40～50 grams per liters, sodium metasilicate 25～35 grams per liters, sodium carbonate 20～30 grams per liters, all the other soak 3～5 minutes for the solution of water, soaking temperature is 60～70 ℃;
3) alkali etch: part is put into composition is NaOH 40～60 grams per liters, all the other are in the solution of water 0.5～1 minute, soaking temperature is 50～60 ℃;
4) acid etch: part is put into composition is 500 milliliters/liter, nitric acid, all the other are in the solution of water 10～15 seconds, soaking temperature is room temperature;
5) soak for the first time zinc: part is put in the solution that composition is NaOH 400～600 grams per liters, zinc oxide 80～120 grams per liters, rocchelle's salt 15～25 grams per liters, ferric trichloride 1～2 grams per liter, all the other are water 0.5～1 minute, and temperature is room temperature;
6) soak for the second time zinc: part is put in the solution that composition is NaOH 400～600 grams per liters, zinc oxide 80～120 grams per liters, rocchelle's salt 15～25 grams per liters, ferric trichloride 1～2 grams per liter, sodium nitrate 0.8～1.2 grams per liter, all the other are water 0.5～1 minute, and temperature is room temperature;
7) surface is adjusted: part is put in the solution that composition is sodium acid carbonate 40～60 grams per liters, all the other are water 10～15 minutes, and temperature is room temperature;
8) chemical nickel plating: part is put in the solution that composition is nickelous sulfate 25～30 grams per liters, dibastic sodium phosphate 20～25 grams per liters, sodium acetate 15～25 grams per liters, winestone carbon 8～12 grams per liters, 12～17 milliliters/liter of complexing agents, stabilizing agent 0.001～0.002 grams per liter, all the other are water 40～60 minutes, and temperature is 90～94 ℃;
It is that the hot water of 60～80 ℃ and normal-temperature water are cleaned to air-dry after piece surface noresidue solution that above-described all work steps finish the rear water temperature of all carrying out.
3. the welding method of aero-engine high energy ignition unit as claimed in claim 1, is characterized in that, in described step 3), the firing equipment adopting can be heat gun.
4. the welding method of aero-engine high energy ignition unit as claimed in claim 1, is characterized in that, in described step 4), in all welding processes, the temperature of monitoring housing any point should be over 70 ℃.
5. the welding method of aero-engine high energy ignition unit as claimed in claim 4, is characterized in that, the mode of described monitoring adopts infrared radiation thermometer.
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| CN201310653541.XA CN103737137B (en) | 2013-12-06 | 2013-12-06 | The welding method of high-energy ignition device of aero-engine |
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| CN201310653541.XA CN103737137B (en) | 2013-12-06 | 2013-12-06 | The welding method of high-energy ignition device of aero-engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160333480A1 (en) * | 2015-05-13 | 2016-11-17 | Dan Porodo | Metallic alloy coating system and method |
| CN110560943A (en) * | 2019-10-12 | 2019-12-13 | 中国科学院金属研究所 | Precision manufacturing method of ultrathin-wall box type cabin section model |
| CN114260534A (en) * | 2021-12-31 | 2022-04-01 | 合肥聚能电物理高技术开发有限公司 | Vacuum brazing method for connecting Ti-6Al-4V and CuZrCr |
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| CN101728373A (en) * | 2008-10-30 | 2010-06-09 | 雅马哈株式会社 | Thermoelectric module package and manufacturing method therefor |
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| US4909071A (en) * | 1988-03-07 | 1990-03-20 | Ngk Spark Plug Co., Ltd. | Spark plug pressure sensor |
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| CN101015875A (en) * | 2007-02-07 | 2007-08-15 | 顺特电气有限公司 | Brazing procedure of aluminium electric-magnetic wires and Guinea gold |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160333480A1 (en) * | 2015-05-13 | 2016-11-17 | Dan Porodo | Metallic alloy coating system and method |
| US9752232B2 (en) * | 2015-05-13 | 2017-09-05 | Dan Porodo | Method of electrolessly plating nickel on tubulars |
| CN110560943A (en) * | 2019-10-12 | 2019-12-13 | 中国科学院金属研究所 | Precision manufacturing method of ultrathin-wall box type cabin section model |
| CN114260534A (en) * | 2021-12-31 | 2022-04-01 | 合肥聚能电物理高技术开发有限公司 | Vacuum brazing method for connecting Ti-6Al-4V and CuZrCr |
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| CN103737137B (en) | 2018-03-09 |
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Effective date of registration: 20180619 Address after: 150060 Songhua Road, core area, Hanan industrial town, Harbin, Heilongjiang, 66 Patentee after: Harbin Dongan electromechanical Manufacturing Co., Ltd. Address before: 150066 51 Po Guo street, Ping Fang District, Harbin, Heilongjiang Patentee before: Harbin Dongan Engine (Group) Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180309 Termination date: 20191206 |