CN103028828A - Diffusion welding device and method based on independent control of local weldment environment temperature - Google Patents
Diffusion welding device and method based on independent control of local weldment environment temperature Download PDFInfo
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- CN103028828A CN103028828A CN2012104478386A CN201210447838A CN103028828A CN 103028828 A CN103028828 A CN 103028828A CN 2012104478386 A CN2012104478386 A CN 2012104478386A CN 201210447838 A CN201210447838 A CN 201210447838A CN 103028828 A CN103028828 A CN 103028828A
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Abstract
The invention discloses a diffusion welding device based on the independent control of a local weldment environment temperature. The device is sequentially provided with a pressure control device, a pressure head, an upper insulated cushion block, an upper electrode pressure lever, a lower electrode pressure lever, a lower insulated cushion block and a support table from top to bottom, wherein weldments are arranged between the upper electrode pressure lever and the lower electrode pressure lever, and the weldments are sequentially a metal workpiece, an interlayer and a non-metal workpiece or a non-metal workpiece, an interlayer and a metal workpiece from top to bottom and also comprise a first graphite heater, a metal environment temperature measuring and controlling device, a first graphite heater power source, a second graphite heater, a second graphite heater power source and a non-metal environment temperature measuring and controlling device. The invention also discloses a diffusion welding method based on the independent control of the local weldment environment temperature. According to the device and the method disclosed by the invention, the diffusion welding temperature can be effectively reduced, and the synchronous telescoping of the non-metal workpiece and the metal workpiece in a diffusion welding process is realized.
Description
Technical field
The present invention relates to a kind of welder and method, be specifically related to a kind of Diffusion Welding apparatus and method of independently controlling based on local weldment environment temperature.
Background technology
The Diffusion Welding joint high-temperature properties is good, is suitable for chemical property and differs larger foreign material and connect, and is connected connection etc. with metal such as pottery.Although its weld interval is longer, the preparation of butt-welding fitting surface and matching requirements are higher, are with a wide range of applications in fields such as Aero-Space, nuclear engineerings.
Nonmetal and the key metal Diffusion Welding is how to control welding residual stress.In recent years, Chinese scholars has been carried out comparatively widely research to this.For control welding residual stress be everlasting the solid-state diffusion plumb joint insert the intermediate layer (Ji Xiaoqiang, etc. connect SiC pottery and Ni based high-temperature alloy [J] with the Zr/Nb composite interlayer. silicate journal, 2002,30 (3): 305-310.).Can't avoid a key issue but insert the intermediate layer method, that be exactly connecting material and be connected material all must the identical Thermal Cycle of experience, this is just inevitable easily to form higher residual stress field in welding point.To this, the people such as Yasuhiro FUKAYA of Japan adopt pulse high current to A1
2O
3Pottery and SUS304 have carried out diffusion welding (DW) research.At first by method for welding at A1
2O
3Pottery, SUS304 face to be connected preset Ag, Cu film, afterwards to A1
2O
3Pottery/Ag film and Ag film/SUS304, A1
2O
3Carry out pulse high current pressurization diffusion welding (DW) between pottery/Cu film and the Cu film/SUS304, the result shows A1
2O
3Pottery side cracking phenomena be improved significantly (YasuhiroFUKAYA, Yasuhisa OKUMOTO, Aki hiko IKUTA, Hidenori KUROKI, BondingA1
2O
3To SUS304 By Pulse Current Heated Bonding atfer Brazing Ag, Cu Thin plateto A1
2O
3, SUS304, welding society's collection of thesis, the 19th volume, No. second, p.336-344 (2001).Patent (application number: 201010233919.7), the SPS method of attachment of a kind of stainless steel and zirconia ceramics has been proposed, whole weldment environment temperature is provided by single graphite heating body, and welding parameter is chosen larger, 1000 ~ 1100 ℃ of 60 ~ 200 ℃/min of heating rate, connection temperature, easily make inside workpiece produce very large residual stress, reduce joint mechanical property.
Although reducing the joint residual stress to nonmetal and metal Diffusion Welding, above research played positive role, but still have the following disadvantages: between nonmetal and metal, insert the intermediate layer for conventional diffusion welding (DW), often need improve to connect temperature and pressure, nonmetal, intermediate layer, metal all must the thermal cycles of the identical welding high temperature of experience simultaneously; Put on nonmetal/intermediate layer/metal Diffusion Welding overall process for the resistance heat that simply pulse high current is produced, certainly will cause so weld heating and cooldown rate to be difficult to control, because the thermophysical property parameters such as thermal coefficient of expansion, elastic modelling quantity differ greatly between nonmetal and the metal, can cause higher residual stress equally in the welding cooling procedure.
Summary of the invention
Goal of the invention: for the problem and shortage of above-mentioned prior art existence, the purpose of this invention is to provide a kind of Diffusion Welding apparatus and method of independently controlling based on local weldment environment temperature, the diffusion welding (DW) temperature be can effectively reduce, non-metal workpiece and the synchronization telescope of metal works in the Diffusion Welding process realized.
Technical scheme: for achieving the above object, the first technical scheme that the present invention adopts is a kind of Diffusion Welding device of independently controlling based on local weldment environment temperature, be provided with successively from top to bottom pressure control device, pressure head, upper cross-over block, the top electrode depression bar, the bottom electrode depression bar, lower cross-over block and brace table, be that welding work pieces (is metal works between described top electrode depression bar and the bottom electrode depression bar, intermediate layer and non-metal workpiece), described welding work pieces is followed successively by metal works from top to bottom, intermediate layer and non-metal workpiece or non-metal workpiece, intermediate layer and metal works, also comprise the first graphite heater, metal environment temperature measurement and control instrument, the first graphite heater power supply, the second graphite heater, the second graphite heater power supply and nonmetal environment temperature measurement and control instrument, described the first graphite heater and the second graphite heater are located at respectively by metal works and the non-metal workpiece, described metal environment temperature measurement and control instrument be connected the environment temperature measurement and control instrument respectively by the first graphite heater power supply be connected the graphite heater power supply and connect the temperature that the first graphite heater and the second graphite heater described metal environment temperature measurement and control instrument and nonmetal environment temperature measurement and control instrument detect respectively metal works and non-metal workpiece surrounding enviroment, control the electric current of the first graphite heater power supply and the second graphite heater power supply.
Preferably, also comprise large current pulse power supply, described large current pulse power supply connects top electrode depression bar and bottom electrode depression bar.Preferred, described large current pulse power supply is numerical control pulse power supply.
Preferably, described pressure head, upper cross-over block, top electrode depression bar, welding work pieces, bottom electrode depression bar, lower cross-over block, brace table, the first graphite heater and the second graphite heater place the vacuum diffusion furnace.
Preferably, described the first graphite heater and the second graphite heater be shaped as hollow cylindrical cavity, and described the first graphite heater and the second graphite heater are respectively around metal works and non-metal workpiece.
Preferably, described pressure control device adopts hydraulic control.
The second technical scheme that the present invention adopts be a kind of utilization as mentioned above the Diffusion Welding device carry out the method for Diffusion Welding, comprise the steps:
Step 1: welding work pieces is put into the vacuum diffusion furnace, and metal works and non-metal workpiece place respectively in the first graphite heater and the second graphite heater, and the intermediate layer is between described metal works and non-metal workpiece;
Step 2: use top electrode depression bar and bottom electrode depression bar to compress welding work pieces, the air in the extracting vacuum diffusion furnace reaches 1 ~ 5 * 10 to the vacuum diffusion furnace
-2The vacuum state of Pa is connected respectively the first graphite heater power supply and the second graphite heater power supply afterwards;
Step 3: connect large current pulse power supply, by top electrode depression bar and bottom electrode depression bar welding work pieces is applied heavy current pulse, so that the interface microcell between intermediate layer and metal works and the non-metal workpiece forms the Transient liquid phase thin layer;
Step 4: the unloading heavy current pulse, continue diffusion welding (DW) according to the described condition of step 2;
Step 5: cut off the first graphite heater power supply and the second graphite heater power supply, workpiece is cooled to room temperature with the vacuum diffusion furnace; Remove top electrode depression bar and bottom electrode depression bar to the workpiece applied pressure, finish Diffusion Welding.
Preferably, in described step 2 and the step 4, the top electrode depression bar is 1-3MPa to the pressure of welding work pieces; In the described step 3, the top electrode depression bar is 5-10MPa to the pressure of welding work pieces.
Beneficial effect: the present invention makes nonmetal independent adjustable with metal environment temperature of living in, to realize nonmetal and the synchronization telescope of metal in diffusion welding (DW) heating and cooling process; By control heavy current pulse group's pulse number and impulse train frequency, realize that the interface micro-area temperature raises rapidly and formation Transient liquid phase thin layer, with the temperature and pressure load of the follow-up diffusion welding (DW) of effective reduction; Control device of the present invention is flexible, easy to use, can be widely used in the heterogeneous material diffusion welding that physical and mechanical properties differs greatly and connect, such as various nonmetal and Metal Material Weldings etc.
Description of drawings
Fig. 1 is the Diffusion Welding apparatus structure schematic diagram of independently controlling based on the weldment local ambient temperature;
Fig. 2 is the Diffusion Welding flow chart of independently controlling based on the weldment local ambient temperature;
Fig. 3 is the structural representation of pressure control device.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
There are the characteristics of significant difference in the thermal coefficient of expansion, elastic modelling quantity etc. that the present invention is based on nonmetal and metal, use two independently graphite heater provide environment temperature as nonmetal parts and metalwork, to realize the nonmetal and synchronization telescope of metal in diffusion welding (DW) heating and cooling process; The diffusion welding (DW) initial stage applies the low-voltage and high-current impulse train at interface to be connected, pulse number and impulse train frequency by control heavy current pulse group, realize that the interface micro-area temperature raises rapidly and formation Transient liquid phase thin layer, with the temperature and pressure load of the follow-up diffusion welding (DW) of effective reduction; Cooling stage after diffusion welding (DW) finishes, on the basis of guaranteeing nonmetal and metal synchronization telescope, according to the workpiece real time temperature, pass through pressure control device, regulate the welding process applied pressure, make it numerical value change according to the rules, further realize welding point residual stress and minimizing deformation.
Referring to Fig. 1, relevant apparatus of the present invention comprises following part: metal environment temperature measurement and control instrument 1, the first graphite heater 2, top electrode depression bar 3, upper cross-over block 4, pressure control device 5, pressure head 6, metal works 7, large current pulse power supply 8, intermediate layer 9, non-metal workpiece 10, bottom electrode depression bar 11, brace table 12, lower cross-over block 13, nonmetal environment temperature measurement and control instrument 14, the second graphite heater power supply 15, the second graphite heater 16, the first graphite heater power supply 17.Described top electrode depression bar 3, bottom electrode depression bar 11 has conducting function, the positive pole of top electrode depression bar 3 connection metal workpiece 7 and large current pulse power supply 8, bottom electrode depression bar 11 connects the negative pole of non-metal workpiece 12 and large current pulse power supply 8, described non-metal workpiece 10, intermediate layer 11, metal works 7, the second graphite heater 16, the first graphite heater 2, top electrode depression bar 3, upper cross-over block 4, pressure head 6, bottom electrode depression bar 11, brace table 12 and lower cross-over block 13 are arranged in vacuum diffusion furnace (not shown) (namely parts are arranged in the vacuum diffusion furnace shown in the dotted line frame of figure), and the first graphite heater power supply 17 and the second graphite heater power supply 15 are respectively the first graphite heater 2 and 16 power supplies of the second graphite heater.
The Diffusion Welding principle of independently controlling based on the weldment local ambient temperature is as follows:
At first the first graphite heater power supply 17, the second graphite heater power supply 15 are respectively the first graphite heater 2,16 power supplies of the second graphite heater, make it to produce radiant heat, be respectively metal works and non-metal workpiece suitable welding surroundings temperature is provided; Then 8 pairs of non-metal workpieces 10 of large current pulse power supply, intermediate layer 9, metal works 7 apply controlled heavy current pulse; Under the effect of pressure control device 5 and pressure head 6,3 pairs of metal works 7 of top electrode depression bar, intermediate layer 9, non-metal workpiece 10 are exerted pressure, when needing pressurization, pressure control device 5 is according to pressure Real-time Feedback value and set-point, the calculating pressure deviation, the aperture instruction of output control magnetic valve realizes the automatic adjusting of pressure; Under resistance heat, heat discharge, photothermal acting in conjunction, the interface microcell local melting of intermediate layer and metal works and non-metal workpiece also forms the Transient liquid phase thin layer, and can stop the output of heavy current pulse this moment; Then the first graphite heater power supply 17, the second graphite heater power supply 15 continue to be respectively the first graphite heater 2,16 power supplies of the second graphite heater, thereby continue to provide radiant heat to keep the environment temperature of diffusion welding (DW).Because various defective bulk depositions such as distortion of lattice on the contact-making surface, dislocation, rooms, the boundary zone energy significantly increases, and atom is in the height state of activation, therefore only need carry out the short period insulation, can finish welding process by the short-range diffusion of atom; Owing to nonmetal in the Diffusion Welding process and metal have been realized synchronization telescope, heavy current pulse effectively reduces the temperature and pressure load of follow-up diffusion welding (DW) at the Transient liquid phase thin layer of interface microcell formation simultaneously, therefore can realize the low stress small deformation welding of nonmetal and metal.
The below, illustrates further the present invention as example by reference to the accompanying drawings take metal works material 40Cr steel, non-metal workpiece material Ti (C, N) cermet, intermediate layer material Cu powder+5%Ti powder (thickness 20 ~ 30 μ m).
The present invention selects graphite body as the environmental radiation thermal source, and the graphite body material is public technology; Large current pulse power supply 8 can be selected numerical control pulse power supply, and pulse frequency is 1 ~ 50Hz, and pulse current peak is 500 ~ 800A, background current 45 ~ 55%; 600 ~ 900 ℃ of welding surroundings temperature are controlled, and the ceramic-metallic environment temperature of non-metal workpiece material Ti (C, N) is higher than the environment temperature of metal works material 40Cr steel, impressed pressure 1 ~ 10MPa.
With reference to Fig. 1, top electrode depression bar 3, upper cross-over block 4, pressure control device 5, pressure head 6 link to each other; Metal environment temperature measurement and control instrument 1 and nonmetal environment temperature measurement and control instrument 14 detect respectively the local ambient temperature of metal works and non-metal workpiece by thermocouple, and by the first graphite heater power supply 17, the second graphite heater power supply 15 is respectively the first graphite heater 2,16 power supplies of the second graphite heater, make it to produce radiant heat, be metal works material 40Cr steel and non-metal workpiece material Ti (C, N) cermet provides suitable welding surroundings temperature, in the present embodiment, metal works material 40Cr steel and non-metal workpiece material Ti (C, N) ceramic-metallic welding surroundings temperature is respectively 700 ℃ and 800 ℃.
With reference to Fig. 1, Fig. 3, slide block 512 and pressure head 6 in the pressure control device 5 for top electrode depression bar 3 provides source pressure, in order to make welding work pieces (being metal works, intermediate layer and the non-metal workpiece) pressure that bears controlled, adopt hydraulic control mode.
With reference to Fig. 2, the Diffusion Welding process of independently controlling based on the weldment local ambient temperature is as follows:
Ti (the C that (1) will polish and clean with acetone, N) cermet/Cu powder+5%Ti powder/40Cr steel workpiece is put into vacuum drying oven, Ti (C, N) cermet and 40Cr steel place respectively in two graphite heaters, Cu powder+5%Ti powder intermediate layer is positioned between Ti (C, N) cermet and the 40Cr steel.
(2) extract diffusion furnace air to 1 ~ 5 * 10
-2The Pa vacuum state applies pre-pressing pressure 1-3MPa by the top electrode depression bar to welding work pieces, connects respectively afterwards two graphite body heating power supplies, for welding work pieces provides suitable environment temperature.
(3) adjustment top electrode depression bar is 5-10MPa to the pressure of welding work pieces, by top electrode depression bar and bottom electrode depression bar welding work pieces is applied heavy current pulse, under the effect of heavy current pulse, between Cu powder+5%Ti powder particles, and Ti (C, N) between cermet and Cu powder+5%Ti powder, the 40Cr steel/Cu powder+5%Ti powder, because contact resistance heat and heat discharge effect, temperature raises rapidly until form liquid phase, at capillary force and adding under the extruding force effect, the linkage interface microcell forms the Transient liquid phase thin layer; Can produce the Transient liquid phase thin layer in order to ensure applying heavy current pulse stage interface, and the needs of conventional diffusion welding (DW), adopt two kinds and exert pressure.Namely pressure is larger when only using two graphite body heating power supplies to weld, and to apply the heavy current pulse staged pressure less, to guarantee to produce enough resistance heats and heat discharge, until Cu powder+5%Ti powder all melts.
(4) apply heavy current pulse after, in case the linkage interface microcell forms the liquid phase thin layer, can unload the heavy current pulse group, enter the conventional diffusion welding (DW) stage of constant temperature and pressure, the top electrode depression bar reverts to 1-3MPa to the pressure of welding work pieces, this phases-time is decided according to the workpiece size, and its span is 15 ~ 60min.
(5) the conventional diffusion welding (DW) stage finishes, and cuts off two graphite body heating power supplies, and workpiece cools to room temperature with the furnace; Remove pre-pressing pressure, finish whole Diffusion Welding process.
When interface temperature was controlled, heavy current pulse group's control parameter was: pulse number n, impulse train frequency f in the group, and effect and the control method of n, f are as follows:
(1) effect of n
In the welding starting stage, because the part, interface is the some contact, current density is larger, in order to reduce welding stress, needs to control the interface heating rate, and needed n value is less; After local interface liquid phase layer formed, the some contact reduced, and current density descends, and interface resistance heat and heat discharge reduce gradually, continued fusing in order to make the interface, and the n value increases gradually; After a contact lost, interface liquid phase thin layer formed, current density descended rapidly, and interface resistance heat and heat discharge significantly reduce, in order to accelerate the welding process, still need to apply the less heavy current pulse group of n, after peak temperature is kept a period of time, close the heavy current pulse group.
(2) effect of f
Certain as n, when f is larger, the impulse train number in the unit interval increases, firing rate is larger; , f certain as n hour, the impulse train number in the unit interval is less, firing rate reduces.
With reference to Fig. 3, pressure control device 5 chief components are as follows: fuel tank 501, filter 502, variable pump 503, overflow valve 504, check valve 505,3-position 4-way solenoid directional control valve 506, flow speed control valve 507, one way sequence valve 508, check valve 509, bi-bit bi-pass solenoid directional control valve 510, hydraulic cylinder 511, slide block 512, electromagnetic relay 513, travel switch xk1, travel switch xk2, travel switch xk3.
Slide block 512 operation cycle are: the decompression → original position stop of fast descending → at a slow speed pressurization → pressurize time-delay → at a slow speed, and the specific embodiment is as follows:
(1) descending fast
Electromagnet 1YA and 3YA energising, solenoid directional control valve 506 and solenoid directional control valve 510 all change to right position.
In-line: variable pump 503 → check valve 505 → solenoid directional control valve 506 → flow speed control valve, 507 → hydraulic cylinder, 511 epicoeles (rodless cavity);
Oil return line: hydraulic cylinder 511 cavity of resorption rod chamber → solenoid directional control valves, 510 → hydraulic cylinder epicoeles (rodless cavity).
Hydraulic cylinder slide block 512 is subjected to effect of weight meeting fast-descending at this moment, adopt differential connection also to guarantee hydraulic cylinder 511 epicoele fuel feeding, and slide block 512 is descending fast.
(2) at a slow speed near workpiece and progressively pressurization
During the buting iron depression stroke switch XK2 that settles on the slide block, electromagnet 3YA outage, solenoid directional control valve 510 is in left position, and check valve 509 is closed.
In-line: variable pump 503 → check valve 505 → solenoid directional control valve 506 → flow speed control valve, 507 → hydraulic cylinder, 511 epicoeles (rodless cavity).
Oil return line: hydraulic cylinder 511 cavity of resorptions (rod chamber) → solenoid directional control valve 510 → one way sequence valve 508 → fuel tank 501.
One way sequence valve 508 makes cavity of resorption set up back pressure, and slide block can not descend by deadweight, and the pressure oil that variable pump 503 is supplied with makes it descending.Because oil return line changes, the epicoele oil-supply speed reduces, and pressure raises and slows down, and piston speed reduces.When slide block 511 contacted workpiece at a slow speed, resistance (load) sharply increased, and the flow speed control valve flow reduces, and hydraulic cylinder piston speed further reduces, and with extremely slow speed workpiece is pressurizeed.
(3) pressurize time-delay
When hydraulic cylinder 511 operating pressures reached predetermined value, pressure switch 513 sent electrical control signal, electromagnet 1YA outage, and solenoid directional control valve 506 multiple metas, hydraulic cylinder advances the back to the fluid chamber sealing, and variable pump 503 is through solenoid directional control valve 506 meta off-loads.Dwell time can be regulated by the time relay of pressure switch 513 controls.
(4) at a slow speed decompression
After pressurize finished, the time relay sent signal and makes electromagnet 2YA energising, and electro-hydraulic reversing valve 506 is cut to left position.
In-line: variable pump 503 → solenoid directional control valve 506 → check valve 509 → solenoid directional control valve, 510 → hydraulic cylinder, 511 cavity of resorptions (rod chamber).
Oil return line: hydraulic cylinder 511 epicoeles (rodless cavity) → flow speed control valve 507 → solenoid directional control valve 506 → fuel tank.
Illustrate: by the flow control hydraulic cylinder piston backhaul speed of control flow speed control valve, thus control workpiece decompression rate.
(5) stop
When hydraulic cylinder was positioned at its reverse stroke end, buting iron pressed down travel switch XK1, electromagnet 2YA outage, and electro-hydraulic reversing valve 506 is in meta, and hydraulic cylinder is locked and is stopped.Variable pump 503 is in unloading condition at this moment.In use, can manually control at any time the 2YA outage, make hydraulic cylinder be at any time halted state.
Claims (7)
1. Diffusion Welding device of independently controlling based on local weldment environment temperature, be provided with successively from top to bottom pressure control device (5), pressure head (6), upper cross-over block (4), top electrode depression bar (3), bottom electrode depression bar (11), lower cross-over block (13) and brace table (12), be welding work pieces between described top electrode depression bar (3) and the bottom electrode depression bar (11), described welding work pieces is followed successively by metal works (7) from top to bottom, intermediate layer (9) and non-metal workpiece (10) or non-metal workpiece (10), intermediate layer (9) and metal works (7), it is characterized in that: also comprise the first graphite heater (2), metal environment temperature measurement and control instrument (1), the first graphite heater power supply (17), the second graphite heater (16), the second graphite heater power supply (15) and nonmetal environment temperature measurement and control instrument (14), described the first graphite heater (2) and the second graphite heater (16) are located at respectively metal works (7) and non-metal workpiece (10) is other, described metal environment temperature measurement and control instrument (1) and nonmetal environment temperature measurement and control instrument (14) detect respectively the temperature of metal works (7) and non-metal workpiece (10) surrounding enviroment, described metal environment temperature measurement and control instrument (1) be connected environment temperature measurement and control instrument (14) respectively by the first graphite heater power supply (17) be connected graphite heater power supply (15) connection the first graphite heater (2) and the second graphite heater (16).
2. the described Diffusion Welding device of independently controlling based on local weldment environment temperature according to claim 1, it is characterized in that: also comprise large current pulse power supply (8), described large current pulse power supply (8) connects top electrode depression bar (3) and bottom electrode depression bar (11).
3. the described Diffusion Welding device of independently controlling based on local weldment environment temperature according to claim 1, it is characterized in that: described pressure head (6), upper cross-over block (4), top electrode depression bar (3), welding work pieces, bottom electrode depression bar (11), lower cross-over block (13), brace table (12), the first graphite heater (2) and the second graphite heater (16) place the vacuum diffusion furnace.
4. the described Diffusion Welding device of independently controlling based on local weldment environment temperature according to claim 1, it is characterized in that: described the first graphite heater (2) and the second graphite heater (16) be shaped as hollow cylindrical cavity, and described the first graphite heater (2) and the second graphite heater (16) are respectively around metal works (7) and non-metal workpiece (10).
5. the described Diffusion Welding device of independently controlling based on local weldment environment temperature according to claim 1, it is characterized in that: described pressure control device (5) adopts hydraulic control.
6. a method of utilizing Diffusion Welding device as claimed in claim 2 to carry out Diffusion Welding comprises the steps:
Step 1: welding work pieces is put into the vacuum diffusion furnace, metal works (7) and non-metal workpiece (10) place respectively in the first graphite heater (2) and the second graphite heater (16), and intermediate layer (9) are positioned between described metal works (7) and the non-metal workpiece (10);
Step 2: use top electrode depression bar (3) and bottom electrode depression bar (11) to compress welding work pieces, air in the extracting vacuum diffusion furnace is connected respectively the first graphite heater power supply (17) and the second graphite heater power supply (15) afterwards to vacuum state;
Step 3: connect large current pulse power supply (8), by top electrode depression bar (3) and bottom electrode depression bar (11) welding work pieces is applied heavy current pulse, so that the interface microcell between intermediate layer (9) and metal works (7) and the non-metal workpiece (10) forms the Transient liquid phase thin layer;
Step 4: the unloading heavy current pulse, continue diffusion welding (DW) according to the described condition of step 2;
Step 5: cut off the first graphite heater power supply (17) and the second graphite heater power supply (15), workpiece is cooled to room temperature with the vacuum diffusion furnace; Remove top electrode depression bar (3) and bottom electrode depression bar (11) to the workpiece applied pressure, finish Diffusion Welding.
According to claim 6 described a kind of utilization as claimed in claim 2 the Diffusion Welding device carry out the method for Diffusion Welding, it is characterized in that: in described step 2 and the step 4, top electrode depression bar (3) is 1-3MPa to the pressure of welding work pieces; In the described step 3, top electrode depression bar (3) is 5-10MPa to the pressure of welding work pieces.
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| CN111886106A (en) * | 2018-03-20 | 2020-11-03 | 国立大学法人大阪大学 | Solid-phase bonding method and solid-phase bonding apparatus for metal material |
| CN112975185A (en) * | 2021-02-24 | 2021-06-18 | 哈尔滨工业大学 | Device for electric field auxiliary ceramic quick connection and use method thereof |
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| CN112975185B (en) * | 2021-02-24 | 2022-01-14 | 哈尔滨工业大学 | Device for electric field auxiliary ceramic quick connection |
| CN116604167A (en) * | 2023-07-20 | 2023-08-18 | 杭州凯龙医疗器械有限公司 | Welding device and welding method for anode of X-ray tube |
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