CN1727106A - Fast, low temperature, temperature difference welding methods for aluminum-lithium alloy - Google Patents
Fast, low temperature, temperature difference welding methods for aluminum-lithium alloy Download PDFInfo
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- CN1727106A CN1727106A CN 200510018822 CN200510018822A CN1727106A CN 1727106 A CN1727106 A CN 1727106A CN 200510018822 CN200510018822 CN 200510018822 CN 200510018822 A CN200510018822 A CN 200510018822A CN 1727106 A CN1727106 A CN 1727106A
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Abstract
A method for quickly welding AlLi alloy material features that in the procedure of pulse current heating, the waveform of current pulses is controlled to form a temp difference between the high temp in welding area and the low temp of whole workpiece, resulting in higher welding speed. It can be used to make the laminal composite metal.
Description
Technical field
The present invention relates to the temperature difference fast welding method of aluminium lithium alloy.
Background technology
Aluminium lithium alloy has less atom gap and high specific strength, good heat-resisting, corrosion resistance, in the Aeronautics and Astronautics field very important using value is arranged.It can be used for the reserve tank of light Fuel and the structure member of spacecraft etc.But, exist very big difficulty during welding because the aluminium lithium is a kind of low-melting alloy.Current the aluminium lithium alloy solder technology is mainly concentrated on soldering and Diffusion Welding aspect, from relevant result of study, generally below 450 ℃, substrate temperature should be controlled at below 200 ℃ the welding temperature of aluminium lithium alloy, but adopts above-mentioned traditional welding method to be difficult to reach above-mentioned requirements.
Diffusion welding (DW) [as patent 1517169], diffusion welding (DW) utilizes radiation, heat transfer by heat conduction, and weld interval is long; Under incorporate even heating source effect, weld interface and matrix all are in the temperature field of basically identical simultaneously, and the substrate performance deterioration is obvious.
Method for resistance welding [as patent 1517169], electric resistance welding utilizes a big dash current, and with the piece-holder location, with two electrodes and Work-sheet pressing, discharge realizes welding; Under the dash current effect, utilize the interface of moment to melt and realize welding.Because in that variations in temperature is big at the interface, moderate finite deformation can appear in workpiece.
Therefore reduce the welding temperature of material, or the control matrix is out of shape and the bulk material properties deterioration becomes the subject matter that aluminium lithium alloy welds.
Fast low temperature, differential temperature welding method are mainly utilized the electricresistance effect, pulse current of the weld interface facilitation to diffusion process, waveform, size by the control impuls electric current, reach and form one at low temperatures the solder side temperature is higher and temperature field that substrate temperature is lower, realize the rapid welding of aluminium lithium alloy.
Summary of the invention
The objective of the invention is to solve the fusing in the above-mentioned welding process, problems such as welding deformation and substrate performance deterioration obtain the good and substrate performance of welding performance and change little aluminium lithium alloy structure.
The present invention proposes to utilize control impuls electrical current heat processing technology to come rapid welding aluminium lithium alloy material.The pulse current heat processing technique utilizes the joule heating effect heating of electric current itself and the discharge activation effect on the interface to promote welding.Because interface resistance is more a lot of greatly than matrix resistance, under the driving of big electric current, understand, and the temperature of matrix still remains at low levels in high-temperature activation district of very fast at the interface formation; Owing at the contact gap place of weld interface, can produce the part electric discharge phenomena in welding process, the interface atom of welding material is activated and purifies simultaneously, and this makes the atom on the welding process median surface also can rapid diffusion form seam under lower temperature.
Details are as follows for technological process specific implementation process of the present invention:
1. raw material is prepared.
The different size aluminium lithium alloy exemplar or the material that process are carried out surface treatment, contact-making surface is adopted the different stage liquid honing; Adopt soaked in absolute ethyl alcohol 3～6h, remove surface organic matter, place 0.5～1M hydrochloric acid to soak 1h, remove oxide layer, clear water is cleaned, and the protective agent (as kerosene) and the 3～5Mpa that pressurizes are coated in vacuum rapid draing, and keep 30 minutes;
2. welding is prepared.
Sample is put into the pulse high current heater, will install cavity and vacuumize, protect feeding pure Ar in the cavity then less than 5Pa;
3. protective agent is removed.
Speed with 20～100 ℃/min is rapidly heated, and warming interface temperature to 100～200 ℃ are incubated 3～5 minutes, removes the exemplar surface protectant;
4. welding temperature control.
Control size of current (50～1500A) and waveform (ripple is wide by 0.5～60sec), and pulse ratio is 1～50: 10～500; Sample interface is heated to the temperature of setting, applies 3～30Mpa in the welding process, be 5～15 minutes weld interval.Because the aluminium lithium alloy fusing point generally about 560 ℃, therefore is controlled at 300～450 ℃ in place, welding process median surface temperature.
5. finished product.
Naturally be cooled to below 80 ℃, stop Ar and feed, obtain finished product.
Characteristics of the present invention are:
1, invention utilizes the electric current Joule heat to carry out the body heating, and programming rate is fast, has simultaneously along the interface temperature height, and leaves characteristics such as interface temperature reduces.
2, among the present invention, electric current is the periodic current of a kind of waveform, controlled amount, thereby temperature and distribution thereof can be regulated in welding process.
3, utilize interface resistance effect and pulse current to promote the effect of diffusion, make workpiece under infusible advantage, realize welding, and reduced interfacial stress to greatest extent.
Compare with existing preparation method, welding temperature of the present invention is low, and warm area is controlled, and weld interval is short, is the method for the high welding of aluminum lithium alloy of a kind of simple, economy and efficient, has great application value at aspects such as Aeronautics and Astronautics and energy industries.
Description of drawings
Fig. 1: welding process flow figure.
Fig. 2: the controllable pulse electric current temperature difference, low temperature rapid welding device schematic diagram.
Fig. 3: the specimen temperature distribution control principle figure in the welding process.
Fig. 4: the specimen temperature in the welding process is distribution schematic diagram longitudinally.
Specific embodiments
Embodiment 1: with diameter is that φ 50mm aluminium lithium alloy 1420 (Al92% Li2.0% Mg5.1% 0.08% Zr, 560 ℃ of fusing points) exemplar solder side adopts coarse sandpaper water mill, abrasive paper for metallograph polishing; Remove surface organic matter with soaked in absolute ethyl alcohol 3h then, place 1M hydrochloric acid to soak 1h, remove oxide layer, clear water cleans up, and vacuum rapid draing is coated protective agent kerosene and the 10MPa and keeping 30 minutes of pressurizeing; With pulse ratio is that 5: 25, the 500A electric current of the wide 10sec of ripple import in the sample, the high-purity Ar gas shiled, and circulation is 5 minutes when interface temperature is 150 ℃, removes surface protectant, and the interface is warming up to 400 ℃, and pressurization 10MPa circulate 10 minutes, and the Ar gas shiled is lowered the temperature.Obtaining material commissure intensity is matrix material intensity 90%.
Embodiment 2: be bar surface employing coarse sandpaper water mill, the abrasive paper for metallograph polishing of φ 100mm aluminium lithium alloy 1420 (560 ℃ of fusing points) with diameter; Remove surface organic matter with soaked in absolute ethyl alcohol 6h then, place 1M hydrochloric acid to soak 1h, remove oxide layer, clear water cleans up, and vacuum rapid draing is coated protective agent and the 5MPa and keeping 30 minutes of pressurizeing; With pulse ratio is that 10: 150, the 1000A electric current of the wide 30sec of ripple import in the sample, the high-purity Ar gas shiled, and circulation is 5 minutes when interface temperature is 200 ℃; remove surface protectant kerosene, the interface is warming up to 350 ℃, pressurization 30MPa; circulated Ar gas shiled cooling 15 minutes.Obtaining material commissure intensity is matrix material intensity 90%.
Embodiment 3: be bar surface employing coarse sandpaper water mill, the abrasive paper for metallograph polishing of φ 10mm aluminium lithium alloy 1420 (560 ℃ of fusing points) with diameter; Remove surface organic matter with soaked in absolute ethyl alcohol 3h then, place 1M hydrochloric acid to soak 1h, remove oxide layer, clear water cleans up, and vacuum rapid draing is coated protective agent and the 5MPa and keeping 30 minutes of pressurizeing; With pulse ratio is that 10: 200, the 100A electric current of the wide 10sec of ripple import in the sample, the high-purity Ar gas shiled, and circulation is 3 minutes when interface temperature is 200 ℃, removes surface protectant kerosene, and the interface is warming up to 450 ℃, and pressurization 5MPa circulate 5 minutes, and the Ar gas shiled is lowered the temperature.Obtaining material commissure intensity is matrix material intensity 92%.
Embodiment 4: with diameter is that φ 50mm aluminium lithium alloy 2091 (530 ℃ of fusing points) exemplar solder side adopts coarse sandpaper water mill, abrasive paper for metallograph polishing; Remove surface organic matter with soaked in absolute ethyl alcohol 3h then, place 1M hydrochloric acid to soak 1h, remove oxide layer, clear water cleans up, and vacuum rapid draing is coated protective agent and the 10MPa and keeping 30 minutes of pressurizeing; With pulse ratio is that 5: 25, the 400A electric current of the wide 10sec of ripple import in the sample, the high-purity Ar gas shiled, and circulation is 5 minutes when interface temperature is 150 ℃, removes surface protectant kerosene, and the interface is warming up to 400 ℃, and pressurization 10MPa circulate 5 minutes, and the Ar gas shiled is lowered the temperature.Obtaining material commissure intensity is matrix material intensity 93%.
Embodiment 5: be bar surface employing coarse sandpaper water mill, the abrasive paper for metallograph polishing of φ 50mm aluminium lithium alloy 2195 (500 ℃ of fusing points) with diameter; Remove surface organic matter with soaked in absolute ethyl alcohol 6h then, place 1M hydrochloric acid to soak 1h, remove oxide layer, clear water cleans up, and vacuum rapid draing is coated protective agent kerosene and the 5MPa and keeping 30 minutes of pressurizeing; With pulse ratio is that 10: 250, the 600A electric current of the wide 10sec of ripple import in the sample, the high-purity Ar gas shiled, and circulation is 5 minutes when interface temperature is 200 ℃, removes surface protectant, and the interface is warming up to 380 ℃, and pressurization 30MPa circulate 15 minutes, and the Ar gas shiled is lowered the temperature.Obtaining material commissure intensity is matrix material intensity 92%.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (2)
1, a kind of quick, temperature difference welding method of aluminium lithium alloy material pulse high current heating, comprise steps such as the dynamic non-uniform temperature field control of alloy surface processing, the big current flow heats process of controllable pulse and the welding of pressurizeing, it is characterized by and at first to insert in the welder through the sample after the surface treatment, to install cavity vacuumizes less than 5Pa, pulse high current is imported in the sample, charge into the high-purity Ar gas shiled, be incubated 3～5 minutes down, to remove surface protectant at 100～200 ℃; Then, adopt specific currents pulse mode interface to be warming up to 300～450 ℃, add certain pressure, a plurality of pulse cycle, be 5～15 minutes weld interval, is cooled to room temperature naturally, overall process Ar gas shiled.
2, method according to claim 1 is characterized in that it mainly being utilize to regulate size of current to reach at interval conduction time the distribution of resistance in the sample is designed in the method, realizes the non-uniform temperature field control of the big current flow heats temperature-rise period of paired pulses.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699520A (en) * | 2012-06-21 | 2012-10-03 | 江苏科技大学 | Low-temperature rapid diffusion welding device and method based on pulse current auxiliary heating |
| CN109623176A (en) * | 2019-02-14 | 2019-04-16 | 福州大学 | A kind of aluminium lithium alloy plate method for laser welding |
| CN113172322A (en) * | 2021-05-14 | 2021-07-27 | 上海交通大学 | Electric auxiliary diffusion connection method using aluminum-lithium alloy gallium as interlayer |
| CN114734107A (en) * | 2022-06-15 | 2022-07-12 | 河北宇天材料科技有限公司 | 1420 aluminum lithium alloy brazing welding method by nickel plating |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5880425A (en) * | 1997-04-29 | 1999-03-09 | Board Of Regents, The University Of Texas System | Method and apparatus for joining metals |
| JP4301761B2 (en) * | 2002-03-08 | 2009-07-22 | 昌雄 本藤 | Joining device by pulse energization |
| CN100335225C (en) * | 2004-07-15 | 2007-09-05 | 武汉理工大学 | Large pulse power supply heating welding method for Ti-6Al-4V titanium alloy |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699520A (en) * | 2012-06-21 | 2012-10-03 | 江苏科技大学 | Low-temperature rapid diffusion welding device and method based on pulse current auxiliary heating |
| CN102699520B (en) * | 2012-06-21 | 2015-08-19 | 江苏科技大学 | The low temperature rapid diffusion welder of pulse current auxiliary heating and welding method thereof |
| CN109623176A (en) * | 2019-02-14 | 2019-04-16 | 福州大学 | A kind of aluminium lithium alloy plate method for laser welding |
| CN113172322A (en) * | 2021-05-14 | 2021-07-27 | 上海交通大学 | Electric auxiliary diffusion connection method using aluminum-lithium alloy gallium as interlayer |
| CN114734107A (en) * | 2022-06-15 | 2022-07-12 | 河北宇天材料科技有限公司 | 1420 aluminum lithium alloy brazing welding method by nickel plating |
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