CN109128509A - A kind of method of high-frequency vibration auxiliary laser welding nickel base superalloy - Google Patents
A kind of method of high-frequency vibration auxiliary laser welding nickel base superalloy Download PDFInfo
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- CN109128509A CN109128509A CN201811300986.9A CN201811300986A CN109128509A CN 109128509 A CN109128509 A CN 109128509A CN 201811300986 A CN201811300986 A CN 201811300986A CN 109128509 A CN109128509 A CN 109128509A
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Classifications
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/32—Bonding taking account of the properties of the material involved
Abstract
The invention belongs to materials processing engineering fields; more particularly to a kind of method of high-frequency vibration auxiliary laser welding nickel base superalloy; step includes: that pretreated nickel base superalloy workpiece is rigidly fixed on workbench; under electromagnetic exciter effect; the resonance state of nickel base superalloy workpiece is kept, carries out laser welding in protective gas environment.In the nickel base superalloy seam organization of the method for the present invention preparation, dendrite, which generates, to be reduced, and is broken more, effectively refinement crystal grain, reduces dendritic segregation, weakens crystal boundary roughening, weld crack is avoided to generate, promote welding line joint hardness.And the method for the present invention is easy to automatically control, is high-efficient, convenient for operation, has ideal engineer application meaning.
Description
Technical field
The invention belongs to materials processing engineering fields, and in particular to a kind of high-frequency vibration auxiliary laser welding nickel-base high-temperature conjunction
The method of gold.
Background technique
Nickel base superalloy is based on good resistance to high temperature oxidation, antifatigue, corrosion resistance and yield strength height, forming
Property with weldability it is good the features such as, be widely used in Aeronautics and Astronautics, nuclear energy, power and petrochemical field.718 nickel of Inconel
Based high-temperature alloy (the domestic trade mark is GH4169) is one of current output and the biggish alloy of dosage, and yield strength occupies deformation
High temperature alloy is the first, and yield accounts for the 45% of wrought superalloy total amount, mainly for the manufacture of aero-engine, industry gas turbine
Moving turbine blade, the turbine disk, combustion chamber etc., can be used in high/low temperature, acidity etc. compared with extreme environment.According to U.S. 2000
Data statistics, dosage of the alloy in GE aero-engine account for 56%, it is seen then that carry out 718 alloy correlative study of Inconel
It has important practical significance.
The welding method for being widely used in nickel base superalloy research has argon arc welding, electron beam welding, soldering and diffusion welding (DW)
Etc. welding techniques.The micro member such as the solution strengthening elements such as W, Mo, Cr, Co, the Al being added in nickel base superalloy and S, P, C, B
Element will increase crack sensitivity, cause to make crackle up, postwelding weld seam easily forms microstructure segregation, brittlement phase and other defect is precipitated,
Welding joint mechanical property and high-temperature and durable is caused to decline.
In the innovation tide of Intelligent welding technology, laser welding is high with its energy density, centrality is good, speed of welding
Fastly, welding deformation is small, welding quality is high, convenient for automation control, stability is good, flexible the advantages that, be widely used in manufacturing
The fields such as industry, auto industry, electric, biomedical, ship, nuclear power, aerospace.High power laser is constantly ground
Hair, has also widened the use scope of laser welding.
Existing nickel base superalloy (Inconel 718) the research on laser-welding shows the Ni-based conjunction that laser welding is formed
There are coarse grains in golden high temperature alloy seam organization, dendrite is segregated more, and a large amount of discontinuous cracks, weld metal zone occurs in heat affected area
Hardness is significantly lower than the defects of base material hardness, so that the performance for the nickel base superalloy workpiece that laser welding is formed is unsatisfactory.
Vibration Welding is the technique to grow up on the basis of oscillating aging, by being welded in the welding process
Component applies exciting force, with weldering with vibration, reaches refinement welding point microstructure, reduces residual stress, improve plumb joint tissue
The purpose of performance, and the time used in postwelding removal residual stress can be shortened, improve production efficiency.
Based on the defect of the existing welding technique of nickel base superalloy, the application imagines laser welding technology and vibrotechnique
The welding applied to nickel base superalloy is combined, to improve the defect of the existing welding technique of nickel base superalloy, and is saved
Resource improves efficiency, and has ideal future in engineering applications.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of high-frequency vibration auxiliary lasers to weld nickel-base high-temperature
The method of alloy, this method reduce the temperature gradient of welding pool, promote liquid metal flows in molten bath, refine weld grain,
Dendritic segregation is reduced, weld crack is avoided, improves the mechanical property of plumb joint (mainly heat affected area).
The technical scheme is that a kind of method of high-frequency vibration auxiliary laser welding nickel base superalloy, step packet
Include: pretreated nickel base superalloy workpiece is rigidly fixed on workbench, under electromagnetic exciter effect, is kept Ni-based
The resonance state of high temperature alloy workpiece carries out laser welding in protective gas environment.Under resonance state, nickel base superalloy workpiece
Resonant frequency and vibration acceleration stablize, form resonant frequency and the stable resonance state of vibration acceleration.
Nickel base superalloy workpiece is rigidly fixed on workbench, and nickel base superalloy workpiece and workbench form one
Body structure.Electromagnetic exciter is assemblied on workbench, and the exciting force that electromagnetic exciter generates, which is transferred to, rigidly fixes Ni-based height
On the workbench of temperature alloy workpiece, the resonant frequency and vibration acceleration of nickel base superalloy workpiece are determined, and keep Ni-based
The resonance state of high temperature alloy workpiece.
Under electromagnetic exciter effect, the method for forming vibration frequency and the stable resonance state of vibration acceleration include with
Lower step: control signal is generated using function signal generator and power amplifier；Electromagnetic exciter is generated according to control signal
Exciting force, and exciting force is transferred to the workbench for rigidly fixing nickel base superalloy workpiece, determine nickel base superalloy work
Vibration frequency range needed for part；Frequency sweep is carried out in vibration frequency range using function signal generator, determines nickel-base high-temperature
The resonant frequency of alloy workpiece；Meanwhile using the vibration acceleration of vialog monitoring nickel base superalloy workpiece, Ni-based height is determined
The vibration acceleration of temperature alloy workpiece determines that the resonance state of nickel base superalloy workpiece, especially resonant frequency and vibration add
Speed stable resonance state.
The exciting force edge of electromagnetic exciter and workbench and/or nickel base superalloy workpiece are in 0 °~90 ° angle directions
On be transferred to the workbench for rigidly fixing nickel base superalloy workpiece.Preferably, the exciting force edge of electromagnetic exciter
It is in that 90 ° of angle sides are passed up to and rigidly fix nickel base superalloy workpiece with workbench and nickel base superalloy workpiece
Workbench.The exciting force of electromagnetic exciter be transferred to rigidly fix the workbench of nickel base superalloy workpiece direction it is adjustable
Section can form the three-dimensional vibration of more in-planes, multi-angle direction, on nickel base superalloy workpiece to meet nickel-base alloy work
Requirement of the part to applied vibration.
The parameter of laser welding are as follows: optical fiber laser, laser power 4000W, speed of welding 0.02m/s, defocusing amount be-
15mm, spot diameter 0.3mm, shield gas flow rate 15L/min, angle of welding gun are 90 °.Under laser weld parameters effect
The laser welding of progress is Laser Deep Penetration Welding.
Vibration frequency range is 0~1500Hz, preferably 300~1500Hz, more preferably 522~1331Hz.
Resonant frequency be 300~1500Hz, preferably 522~1331Hz, more preferably 522Hz, 919Hz or
1331Hz；It is 919Hz as preferred version of the present invention.
Vibration acceleration is 15~51m/s2, preferably 20~51m/s2, more preferably 20.20m/s2Or 50.10m/
s2；It is 50.10m/s as preferred version of the present invention2。
The parameter of electromagnetic exciter are as follows: encouraging coil current is 0~2A, preferably 2A.
The preprocess method of nickel base superalloy workpiece are as follows: polishing and clear is successively carried out to nickel base superalloy workpiece surface
Clean processing is polished after removing nickel-base alloy workpiece surface oxide layer and spot, then cleaned with acetone, and natural air drying guarantees Ni-based
Alloy surface to be welded it is bright, smooth.
Protective gas includes the gaseous mixture of argon gas, nitrogen or argon gas and nitrogen, preferably purity be 99.99% argon
Gas.
As a preferred embodiment of the present invention, pretreated nickel base superalloy workpiece, which is rigidly fixed in, to be equipped with
On the workbench of electromagnetic exciter；Control signal is generated using function signal generator and power amplifier；Electromagnetic exciter
Exciting force is generated according to control signal, and is in 90 ° of angle sides with workbench and nickel base superalloy workpiece by exciting force edge
It is passed up to the workbench for rigidly fixing nickel base superalloy workpiece, the frequency of vibration needed for determining nickel base superalloy workpiece
Rate range；Frequency sweep is carried out in vibration frequency range using function signal generator, determines the resonance of nickel base superalloy workpiece
Frequency；Meanwhile using the vibration acceleration of vialog monitoring nickel base superalloy workpiece, the vibration of nickel base superalloy workpiece is determined
Dynamic acceleration；Nickel base superalloy workpiece keeps resonant frequency and the stable resonance state of vibration acceleration, protective gas environment
Middle carry out laser welding；
Laser weld parameters are as follows: optical fiber laser, laser power 4000W, speed of welding 0.02m/s, defocusing amount be-
15mm, spot diameter 0.3mm, shield gas flow rate 15L/min, angle of welding gun are 90 °.
Vibration frequency range is 0~1500Hz, preferably 300~1500Hz, more preferably 522~1331Hz.
Resonant frequency be 300~1500Hz, preferably 522~1331Hz, more preferably 522Hz, 919Hz or
1331Hz；It is 919Hz as preferred version of the present invention.
Vibration acceleration is 15~51m/s2, preferably 20~51m/s2, more preferably 20.20m/s2Or 50.10m/
s2；It is 50.10m/s as preferred version of the present invention2。
The method of high-frequency vibration auxiliary laser welding nickel base superalloy of the present invention, can refine crystal grain, reduce dendritic segregation,
Weld crack is avoided, nickel base superalloy strength of welded joint is promoted, is particularly suitable for 718 nickel base superalloy plate of Inconel
Material.
Compared with the existing technology, the present invention has the advantages that
(1) high frequency vibrating that the present invention passes through the introducing electromagnetic exciter in nickel base superalloy workpiece laser welding process
Centrifugal mechanical vibration exciter dynamic, that substitution industrially generally uses reduces vibration amplitude while improving vibration frequency.
Under the high-frequency vibration effect of electromagnetic exciter, agitation molten pool enhances liquid metal flow in molten bath, reduces molten bath
Temperature gradient, can effectively be crushed molten bath columnar dendrite, and the decrease of bath temperature gradient, further hinder columnar dendrite
The generation of equal coarse grains, to refine seam organization crystal grain；Effectively drive the precipitated phases such as Nb, Mo, Ti, C element to austenite
Diffusion weakens crystal boundary and is roughened trend；It avoids weld crack from generating, promotes weld metal zone hardness, it is final to improve Nickel-based Alloy Welding head
Mechanical property.
(2) vibration frequency for the electromagnetic exciter that the present invention uses may be up to kHz, with centrifugal mechanical vibration exciter one
As compared in the maximum vibration frequency of 60Hz~100Hz, it is possible to provide vibration bandwidth, maximum frequency of oscillation are big, vibration frequency connects
Continue adjustable high-frequency vibration.
For different nickel base superalloy workpiece, electromagnetic exciter can provide different vibration frequencies, can also pass through adjusting
The vibration direction of transfer of electromagnetic exciter, forms the solid of more in-planes, multi-angle direction on nickel base superalloy workpiece
Vibration, further satisfaction difference nickel base superalloy workpiece avoid weld crack from generating refinement crystal grain, reduction dendritic segregation,
Promote the demand of welding line joint hardness.
(3) the method for the present invention be also easy to automation control, convenient for operation and it is high-efficient, have extensive engineer application before
Scape.
Detailed description of the invention
Fig. 1 is the high-frequency vibration assistant laser welding device schematic diagram that the present invention is used for nickel base superalloy.In figure, 1- weldering
Connect workbench, 2- electromagnetic actuator, 3- rubber mat, 4- nickel base superalloy workpiece, 5- fixture, 6- gas passage, 7- laser
Beam, 8- controller, 9- backing plate, 10- bloom.
Fig. 2 is 718 nickel-base alloy plate welding seams area precipitated phase shape appearance figure of Inconel under different vibration frequencies.A is 0Hz vibration
718 nickel-base alloy plate welding seams area precipitated phase shape appearance figure of Inconel under frequency, b are 718 nickel of Inconel under 522Hz vibration frequency
Based alloy plate welding seams area precipitated phase shape appearance figure, c are that the 718 nickel-base alloy plate welding seams area Inconel is precipitated under 919Hz vibration frequency
Phase morphology figure, d are 718 nickel-base alloy plate welding seams area precipitated phase shape appearance figure of Inconel under 1331Hz vibration frequency.
Fig. 3 is the 718 nickel-base alloy plate plumb joint base material area Inconel, heat affected area and weld metal zone under different vibration frequencies
Microhardness distribution curve.1 is the microhardness distribution of 718 nickel-base alloy plate plumb joint of Inconel under 0Hz vibration frequency
Curve, 2-1 are the microhardness distribution curve of 718 nickel-base alloy plate plumb joint of Inconel under 522Hz vibration frequency, and 2-2 is
The microhardness distribution curve of 718 nickel-base alloy plate plumb joint of Inconel under 919Hz vibration frequency, 2-3 are 1331Hz vibration
The microhardness distribution curve of 718 nickel-base alloy plate plumb joint of Inconel under frequency.
Fig. 4 is 718 nickel-base alloy plate welding seams area precipitated phase shape appearance figure of Inconel under different vibration accelerations.A is 0m/s2
718 nickel-base alloy plate welding seams area precipitated phase shape appearance figure of Inconel, b 15.10m/s under vibration acceleration2Under vibration acceleration
718 nickel-base alloy plate welding seams area precipitated phase shape appearance figure of Inconel, c 20.20m/s2718 nickel of Inconel under vibration acceleration
Based alloy plate welding seams area precipitated phase shape appearance figure, d 50.10m/s2718 nickel-base alloy plate welding seams of Inconel under vibration acceleration
Area's precipitated phase shape appearance figure.
Fig. 5 is 20.20m/s2The 718 nickel-base alloy plate welding seams area Inconel under vibration acceleration, 1331Hz vibration frequency
Microstructure figure (a), the isometric crystalline region enlarged drawing (b) in weld metal zone, weld metal zone columnar zone enlarged drawing (c) and weld metal zone fusion
Born of the same parents' crystalline region enlarged drawing (d) near line.
Specific embodiment
In order to realize the present invention technological means, creation characteristic, reach purpose and effect is apparent to, below with reference to tool
Body case study on implementation and attached drawing, the present invention is further explained.
High-frequency vibration assistant laser welding device for nickel base superalloy as shown in Figure 1, welding platform 1
The vertical Motionless electromagnetic formula vibration excitor 2 in bottom surface, electromagnetic exciter 2 are located at the center of welding platform；Welding platform 1
Top surface be horizontally fixed with backing plate 9, in order to preferably transmit vibration, between welding platform 1 and backing plate 9 be symmetrical arranged glue
Pad 3；Nickel base superalloy workpiece 4 is fixed on backing plate 9 by 5 level of fixture, between nickel base superalloy workpiece 4 and backing plate 9
It is symmetrically arranged with bloom 10, prevents nickel-based high-temperature alloy sheet material and welding with backing from connecting；The top of welding platform 1 is equipped with laser
Welding equipment, laser welding apparatus include the gas passage 6 for conveying inert gas and the laser beam 7 for laser welding；
Controller 8 connects electromagnetic actuator 2, is provided with function signal generator, power amplifier and vialog etc. on controller 8.
By the fixed function of rubber mat 3, backing plate 9 and fixture 5, nickel-based high-temperature alloy sheet material is rigidly secured to welding
On platform 1, nickel-based high-temperature alloy sheet material and welding mesa-shaped are into a single integrated structure, preferably transmitting vibration, are conducive to one knot
The nickel-based high-temperature alloy sheet material and welding platform of structure form vibration and resonance state.
The exciting force edge of electromagnetic actuator 2 is in welding platform 1, backing plate 9 and nickel base superalloy workpiece 4
Welding platform 1, backing plate 9 and nickel base superalloy workpiece 4 are successively transferred on the direction of 90 ° of angles, perpendicular to welding
The exciting force to pump is formed in the plane of workbench 1, backing plate 9 and nickel base superalloy workpiece 4.
It is auxiliary that high-frequency vibration is carried out to 718 nickel-base alloy plate of Inconel using IPG YLS-5000 high-capacity optical fiber laser
Help the processing step of laser self-welding as follows:
It is using fixture 5 that the 718 nickel-base alloy plate of Inconel of to be welded 100 (length) × 50 (width) × 5 (thickness) mm is rigidly solid
It is scheduled on the fixed backing plate 9 in 1 top surface of welding platform, is symmetrically arranged between 718 nickel-base alloy plate of Inconel and backing plate 9
Bloom connects to prevent nickel-base alloy plate and welding with backing.
With the surface of 400# coarse sandpaper polishing 718 nickel-base alloy plate of Inconel, surface oxide layer and spot are removed, is prevented
Molten bath occurs being mingled with and stomata when welding, is finally cleaned with acetone, natural air drying.
Controller 8 is opened, high-frequency vibration frequency platform is started, generates control letter using function signal generator and power amplifier
Number；Electromagnetic actuator 2 generates mechanical oscillation according to the exciting force that control signal adjusts itself, and mechanical oscillation are transferred to just
Property fixed 718 nickel-base alloy plate of Inconel welding platform 1, substantially determine 718 nickel-base alloy plate of Inconel to be welded
Required vibration frequency range；Frequency sweep is carried out in the vibration frequency range using function signal generator, finds Inconel
The resonant frequency of 718 nickel-base alloy plates；
After determining resonant frequency, under the resonance state of 718 nickel-base alloy plate of Inconel to be welded, Tuning function signal hair
The voltage and current of the output voltage amplitude control electromagnetic actuator 2 of raw device, to change the output work of electromagnetic actuator 2
Rate；Meanwhile be monitored using vibration acceleration of the vialog to 718 nickel-base alloy plate of Inconel to be welded, find be suitble to
Weld the vibration acceleration of 718 nickel-base alloy plate of Inconel；Regulate and control electromagnetic type by the output voltage of function signal generator to swash
The amplitude and frequency of vibration device, are easy to carry out automation control, reduce cost.
Vibration acceleration is directly proportional to Oscillation Amplitude within the scope of high-frequency vibration, reflects the size of oscillation intensity.
After determining resonant frequency and resonance acceleration, the resonance state of 718 nickel-base alloy plate of Inconel, starting are kept
Robot is synchronous to carry out laser welding, laser welding process parameter are as follows: fibre laser power 4000W, speed of welding are
0.02m/s, defocusing amount are -15mm, spot diameter 0.3mm, shield gas flow rate 15L/min, and angle of welding gun is 90 °.
It resonates in laser beam welding, the excitation coil electric current of electromagnetic actuator is 2A.
After completion 30s to be laser welded, closing machine people control system and high-frequency vibration frequency platform obtain welding joint shaping
Preferably, the nickel-base alloy workpiece organized crystal grain refinement, weld crack, welding joint mechanical property is avoided to improve.
It, will according to above-mentioned 718 nickel-base alloy plate high-frequency vibration auxiliary laser of Inconel from the processing step of melting welding
718 nickel-base alloy plate of Inconel is rigidly secured on workbench, according to laser parameter listed by table 1 and vibration parameters respectively into
Row resonant frequency and vibration acceleration are investigated.
1 high-frequency micro-vibration laser welding process parameter of table
(1) resonant frequency is investigated
As shown in 1,2-1 to 2-3 in table 1,20.20m/s is selected2Vibration acceleration, pass through and apply different vibration frequencies
522Hz, 919Hz, 1331Hz, the vibration auxiliary laser that grouping carries out nickel-base alloy workpiece, which welds, to be investigated, under different vibration frequencies
Phase morphology is precipitated for the 718 nickel-base alloy plate welding seams area Inconel as shown in Fig. 2, Inconel 718 is Ni-based under different vibration frequencies
The fiber stiffness distribution curve in alloy sheets plumb joint base material area, heat affected area and weld metal zone is as shown in figure 3, under different vibration frequencies
It is as shown in table 2 that 718 nickel-base alloy plate plumb joint fiber stiffness of Inconel measures statistical result.
Plumb joint micro-hardness measurement statistical result under the different vibration frequencies of table 2
As shown in Figure 2, as vibration frequency increases, commissure interdendritic precipitated phase is gradually decreased, or even is disappeared.Vibration frequency
Rate is an Important Parameters of vibration acceleration, is one of the key factor for influencing vibration acceleration size.Vibration frequency is bigger,
Vibration acceleration is bigger, and vibrational energy is higher, and molten bath vibration is more violent, does work to molten bath more, and atom acquisition energy is more, heat
Move it is more violent, reduce molten bath in temperature gradient, reduce crystallization rate spread alloying element sufficiently, increase high temperature under γ ' with
γ " hardening constituent transformation time reduces low temperature Laves phase and is precipitated, reduce dendritic segregation, improves weld properties.
As seen from the results in Table 2, heat affected area: the microhardness mean value for introducing vibration (522Hz, 919Hz, 1331Hz) is high
In the microhardness for being not introduced into (0Hz) vibration；Weld metal zone: the microhardness mean value of vibration (522Hz, 919Hz, 1331Hz) is introduced
It is below the microhardness for being not introduced into (0Hz) vibration；Welding point: relative to vibration (0Hz) is not introduced into, vibration is introduced
After (522Hz), microhardness mean value is increased；And then the raising with vibration frequency, fiber stiffness mean value is on a declining curve,
Dislocation density may be caused to reduce or disappear by high-frequency vibration to be caused.
From the figure 3, it may be seen that heat affected area fiber stiffness changes in distribution is unobvious after introducing vibration, weld metal zone microhardness point
Cloth is fallen after rising, and in 919Hz, and weld metal zone microhardness maximum value is apparently higher than other vibration frequencies, it was demonstrated that 919Hz is most
Good vibration frequency.
To sum up, opposite pure laser welds, and when laser welding introduces vibration, it can be achieved that improving welding joint mechanical property
Purpose.When introducing proper vibration, can make heat affected area, weld metal zone, plumb joint entirety mechanical property relative to pure laser
Welding is most preferably improved.
(2) vibration acceleration is investigated
As shown in 1,1-4 to 1-6 in table 1, the vibration frequency of 1331Hz is selected, by applying different vibration accelerations
15.10m/s2、20.20m/s2、50.10m/s2, the vibration auxiliary laser welding of grouping progress 718 nickel-base alloy plate of Inconel
It investigates, it is as shown in Figure 4 that phase morphology is precipitated in the weld metal zone under 718 nickel-base alloy plate difference vibration acceleration of Inconel.
As shown in Figure 4, as vibration acceleration increases, interdendritic white precipitated phase is fewer and fewer, or even disappears.With vibration
Acceleration increases, and elements diffusion speed is accelerated in liquid metal, promotes Mo element solid solution into austenite, Nb, Ti member under high temperature
Element is sufficiently combined with Ni, forms γ ' and γ " precipitated phase, reduces interdendritic segregation, reduces the life of brittle phase Laves under low temperature
At rate, connector plasticity and toughness are improved.
Also carry out 1-1 to 1-3 in table 1, under 522Hz vibration frequency, 20.20m/s2、30.2m/s2、48.5m/s2Vibration
Dynamic acceleration is investigated, similar to the investigation result trend of 1-4 to 1-6, as vibration acceleration increases, interdendritic white precipitated phase
It is fewer and fewer, or even disappear.
(3)20.20m/s2The 718 nickel-base alloy plate welding seams area Inconel is aobvious under vibration acceleration, 1331Hz vibration frequency
Micro-assembly robot is investigated
According to aforementioned high-frequency vibration auxiliary laser from the processing step and laser welding process parameter of melting welding, 1331Hz is selected
Vibration frequency, 20.20m/s2Vibration acceleration, carry out 718 nickel-base alloy plate of Inconel vibration auxiliary laser welding,
Rivet nut shape plumb joint, weld metal zone and heat affected area is formed on 718 nickel-base alloy plate of Inconel to occur without liquation crack.
718 nickel-base alloy plate plumb joint weld metal zone microscopic structure of Inconel is as shown in figure 5, a is the weldering of Inconel718 nickel-base alloy plate
Joint welding area microscopic structure distribution map, b are the 718 isometric crystalline region enlarged drawing in nickel-base alloy plate plumb joint weld metal zone of Inconel, c
For 718 nickel-base alloy plate plumb joint weld metal zone columnar zone enlarged drawing of Inconel, d is the weldering of 718 nickel-base alloy plate of Inconel
Born of the same parents crystalline region enlarged drawing near joint welding area melt run.
As shown in Figure 5, lower laser welding head weld metal zone Tissue distribution and without friction consistent, including weld seam district center etc. are vibrated
Axis area, columnar zone, the neighbouring born of the same parents crystalline region of melt run.Unlike, after laser assisted vibration, occur born of the same parents crystalline region in weld metal zone,
There are some shake broken lines in born of the same parents crystalline region crystal grain, and born of the same parents' Jingjing grain is unobvious in 50 μ m of edge, mostly black fine grained.Column
A transgranular elongated dendrite fracture is biased to crystallographic axis two sides, is in wheat head shape and catkin shape.Secondary dendrite falls off, and Dispersed precipitate exists
Intergranular.
By upper test result it is found that being aided with high-frequency vibration in nickel base superalloy laser beam welding, weld seam group can be refined
Crystal grain is knitted, dendritic segregation is reduced, weakens crystal boundary and is roughened trend, avoid weld crack, promote weld metal zone hardness, improve plumb joint
Mechanical property improves the reliability of nickel base superalloy weldment, meets the various requirements of Nickel-based Alloy Welding part, is promoted
The industrial application of Nickel-based Alloy Welding part.
The above is preferred embodiments of the invention, but the present invention is not limited to the embodiment disclosure of that.It is all
The equivalent or modification completed under principles of this disclosure is not departed from, the scope of the present invention is both fallen within.
Claims (10)
1. a kind of method of high-frequency vibration auxiliary laser welding nickel base superalloy, which is characterized in that step includes: preprocessed
Nickel base superalloy workpiece be rigidly fixed on workbench, electromagnetic exciter effect under, keep nickel base superalloy work
The resonance state of part carries out laser welding in protective gas environment.
2. the method according to claim 1, wherein the resonance of nickel base superalloy workpiece is frequently under resonance state
Rate and vibration acceleration are stablized.
3. the method according to claim 1, wherein forming the method packet of nickel base superalloy workpiece resonance state
It includes following steps: generating control signal using function signal generator and power amplifier；Electromagnetic exciter is according to control signal
Exciting force is generated, and exciting force is transferred to the workbench for rigidly fixing nickel base superalloy workpiece, determines that nickel-base high-temperature closes
Vibration frequency range needed for metal working part；Frequency sweep is carried out in vibration frequency range using function signal generator, is determined Ni-based
The resonant frequency of high temperature alloy workpiece；Meanwhile using the vibration acceleration of vialog monitoring nickel base superalloy workpiece, nickel is determined
The vibration acceleration of based high-temperature alloy workpiece determines the resonance state of nickel base superalloy workpiece.
4. according to the method described in claim 3, it is characterized in that, vibration frequency range is 0~1500Hz.
5. method according to claim 1 or 3, which is characterized in that the exciting force of electromagnetic exciter along with workbench and/
Or nickel base superalloy workpiece be passed up in 0 °~90 ° angle sides rigidly fix nickel base superalloy workpiece work it is flat
Platform.
6. the method according to claim 1, wherein the parameter of laser welding are as follows: optical fiber laser, laser power
4000W, speed of welding 0.02m/s, defocusing amount are -15mm, spot diameter 0.3mm, shield gas flow rate 15L/min, welding gun
Angle is 90 °.
7. method according to claim 1 or 3, which is characterized in that under resonance state, the resonance of nickel base superalloy workpiece
Frequency is 300~1500Hz, and vibration acceleration is 15~51m/s2。
8. the method according to claim 1, wherein the preprocess method of nickel base superalloy workpiece are as follows: to nickel
Based high-temperature alloy workpiece surface successively carries out polishing and cleaning treatment, polishing removal nickel-base alloy workpiece surface oxide layer and spot
Afterwards, then with acetone it cleans, natural air drying, guarantees the bright, smooth of nickel-base alloy surface to be welded.
9. the method according to claim 1, wherein protective gas includes argon gas, nitrogen or argon gas and nitrogen
Gaseous mixture.
10. method according to claim 1 or 3, which is characterized in that the coil current of encouraging of electromagnetic exciter is 0~2A.
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| CN201811300986.9A CN109128509A (en) | 2018-11-02 | 2018-11-02 | A kind of method of high-frequency vibration auxiliary laser welding nickel base superalloy |
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| CN114273750A (en) * | 2021-12-10 | 2022-04-05 | 天津大学 | Method for regulating and controlling Laves phase precipitation form and distribution in nickel-based alloy manufactured by electric arc additive manufacturing |
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