CN107008985A - A kind of molybdenum alloy fusion welding method based on microalloying with synchronous parasitic soldering - Google Patents
A kind of molybdenum alloy fusion welding method based on microalloying with synchronous parasitic soldering Download PDFInfo
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- CN107008985A CN107008985A CN201710284251.0A CN201710284251A CN107008985A CN 107008985 A CN107008985 A CN 107008985A CN 201710284251 A CN201710284251 A CN 201710284251A CN 107008985 A CN107008985 A CN 107008985A
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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
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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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
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
Abstract
The invention discloses a kind of molybdenum alloy fusion welding method based on microalloying with synchronous parasitic soldering, comprise the following steps：1) calmodulin binding domain CaM to be welded for treating welding workpiece is pre-processed, wherein, the material of the workpiece to be welded is molybdenum or molybdenum alloy；2) metallic intermediate layer is filled at the faying face to be welded of workpiece to be welded, then completes the docking of workpiece to be welded；3) workpiece to be welded is placed in the atmosphere of inert gas shielding or in vacuum environment, then treats the calmodulin binding domain CaM to be welded of welding workpiece and preheated；4) fusion welds of workpiece to be welded, the workpiece after must welding are completed；5) welding point of welded workpiece is incubated; the welding point of welded workpiece is placed in inert gas shielding atmosphere or is cooled to room temperature in vacuum environment again; the molybdenum alloy melting welding based on microalloying with synchronous parasitic soldering is completed, this method can effectively improve the mechanical property of welded workpiece welding point.
Description
Technical field
The invention belongs to welding technology field, it is related to a kind of molybdenum alloy melting welding based on microalloying with synchronous parasitic soldering
Method.
Background technology
Molybdenum, fusing point is up to 2610 DEG C, and neutron absorption cross-section is small, and thermal coefficient of expansion is low, and heat-conductive characteristic is excellent, high-temperature mechanics
Performance is good, and machinability is good, and when temperature is less than 500 DEG C, molybdenum has good stability in air or water.Above-mentioned advantage causes
Molybdenum and molybdenum alloy, especially high-performance molybdenum alloy have important application in fields such as metallurgy, Aeronautics and Astronautics, nuclear energy, military affairs.It is high
Itself obdurability of performance molybdenum alloy is excellent, but once carries out melting welding, and its is tough, and sexual clorminance will completely lose.Moreover, due to
The fusing point of molybdenum is too high, typically must preparation is processed by the way of powder metallurgy, on the one hand cause material density can not and founding
Metallurgical material is compared, air content is higher, and weld blowhole defect is serious；On the other hand, easily the impurity such as O, N are introduced into material, and
Solubility of the impurity element such as O, N in molybdenum is extremely low at room temperature, and the impurity element such as O, N is easy in grain boundaries segregation when molten bath solidifies,
Make crystal boundary severe weakness, the mechanical property extreme difference of weld seam, above mentioned problem seriously constrains molybdenum and molybdenum alloy exists as structural material
The application of the key occasion such as nuclear power.
The content of the invention
It is an object of the invention to overcome the shortcoming of above-mentioned prior art there is provided one kind based on microalloying with synchronously post
The molybdenum alloy fusion welding method of raw soldering, this method can effectively improve the mechanical property of welded workpiece welding point.
To reach above-mentioned purpose, the molybdenum alloy fusion welding method of the present invention based on microalloying with synchronous parasitic soldering
Comprise the following steps：
1) calmodulin binding domain CaM to be welded for treating welding workpiece is pre-processed, wherein, the material of the workpiece to be welded is molybdenum
Or molybdenum alloy；
2) metallic intermediate layer is filled at the faying face to be welded of workpiece to be welded, then completes the docking of workpiece to be welded, its
In, the fusing point of metallic intermediate layer is less than the fusing point of workpiece to be welded, the filling region scope covering welding process of metallic intermediate layer
In workpiece arc-seam weld region to be welded and the heat-affected zone of melting welding；
3) workpiece to be welded is placed in the atmosphere of inert gas shielding or in vacuum environment, then treats treating for welding workpiece
Weldering calmodulin binding domain CaM is preheated；
4) fusion welds of workpiece to be welded are completed, during fusion welds, the joint location of workpiece to be welded and its
The metallic intermediate layer of near zone melts, and the joint location of metallic intermediate layer and workpiece to be welded is formed molten soldering metallurgy
With reference to；
5) welding point of welded workpiece is incubated, then the welding point of welded workpiece is placed in inert gas
Room temperature is cooled in protective atmosphere or in vacuum environment, the molybdenum alloy melting welding based on microalloying with synchronous parasitic soldering is completed.
Step 1) in treat the concrete operations that the calmodulin binding domain CaM to be welded of welding workpiece pre-processed and be：By workpiece to be welded
Calmodulin binding domain CaM to be welded polished successively, alkali cleaning, acetone cleaning and dry；
The material of workpiece to be welded is that the molybdenum alloy of pure molybdenum, alloying element content less than or equal to 2wt% or second are mutually adulterated
Thing content is less than or equal to 2wt% molybdenum alloy.
Step 4) in workpiece to be welded is completed using Laser Welding, electron beam weldering, beam-plasma weldering or the method for argon arc welding
Fusion welds；
The welding point form of welded workpiece is pipe/rod casing joint, lap joint, the banjo fixing butt jointing with backing plate, envelope
The cruciform joint of bottom banjo fixing butt jointing, the T connector of incomplete fusion or incomplete fusion.
The material of metallic intermediate layer is Ti, Ni, Zr or Al.
Step 2) in treated by way of directly filling metal foil, sputter coating, plating, cold spraying or laser melting coating
Metallic intermediate layer is filled at the faying face to be welded of welding workpiece.
The purity of metallic intermediate layer is more than or equal to 99.99%.
Step 3) in preheating temperature be 400 DEG C -500 DEG C.
Step 2) in workpiece to be welded docking after the completion of, the butt-joint clearance of workpiece to be welded is less than or equal to 0.1mm, to be welded
The unfitness of butt joint for connecing workpiece joint is less than or equal to the 10% of thickness of workpiece to be welded, and the unfitness of butt joint of workpiece joint to be welded is small
In 0.5mm；
The gap of the overlapping regions of workpiece to be welded filled with metallic intermediate layer is less than or equal to 0.05mm.
The invention has the advantages that：
Molybdenum alloy fusion welding method of the present invention based on microalloying and synchronous parasitic soldering in concrete operations,
Metallic intermediate layer is filled at the faying face to be welded of workpiece to be welded, wherein, the fusing point of metallic intermediate layer is less than workpiece to be welded
Fusing point, so as to enter part metallic intermediate layer in molten bath in fusion process, realizes the microalloying of arc-seam weld, simultaneously
Because the thermal conductivity of molybdenum and molybdenum alloy is higher, make to melt away from the metallic intermediate layer in the range of weld-fusion line certain distance,
So as to form the soldering interface for parasitizing melting welding heat affected area, the metallurgical junction between workpiece to be welded is realized by the soldering interface
Close, with obvious auxiliary carrying effect.Welded it should be noted that one aspect of the present invention is effectively improved melting welding by microalloying
The mechanical property of seam, the auxiliary on the other hand realizing Welded Joints by synchronous parasitic soldering is carried, and in two kinds of mechanism
Under collective effect, the overall mechanical property of the significant joint made by flame welding for improving molybdenum and molybdenum alloy.
Brief description of the drawings
Fig. 1 is Ti-Mo binary decision tree phasors；
Fig. 2 a are structural representation when being not added with Ti paper tinsels in embodiment one；
Fig. 2 b are the structural representation in embodiment one only when joint adds Ti；
Fig. 2 c are the structural representation in embodiment one when joint and lap-joint add Ti paper tinsels；
Fig. 3 a are the dimensional drawing of molybdenum tube 1 in embodiment one；
Fig. 3 b are the dimensional drawing of molybdenum alloy end plug 2 in embodiment one；
Fig. 3 c be embodiment one in only when joint adds Ti metallic intermediate layer 3 dimensional drawing；
Fig. 3 d be embodiment one in when joint and lap-joint add Ti paper tinsels metallic intermediate layer 3 dimensional drawing；
Fig. 4 is welding point cross-sectional morphology and soldering interface constituent analysis figure in embodiment one；
Fig. 5 a be embodiment one in be not added with welding point microhardness distribution figure during Ti paper tinsels；
Fig. 5 b be embodiment one in when joint and lap-joint add Ti paper tinsels welding point microhardness distribution figure；
Fig. 6 is stress strain curve figure in the embodiment of the present invention one；
Fig. 7 a are to be not added with shape appearance figure during Ti paper tinsels after welding point tension failure in embodiment one；
Fig. 7 b are the shape appearance figure in embodiment one when joint and lap-joint add Ti paper tinsels after welding point tension failure；
Fig. 8 a are to be not added with the microstructure figure of welding point stretching fracture during Ti paper tinsels in embodiment one；
Fig. 8 b be embodiment one in when joint and lap-joint add Ti paper tinsels welding point stretching fracture microstructure
Figure；
Fig. 9 is the cross-sectional morphology figure of welding point in embodiment two；
Figure 10 is the stress strain curve figure in embodiment two；
Figure 11 is the cross-sectional morphology figure of welding point in embodiment three；
Figure 12 is the stress strain curve figure in embodiment three；
Figure 13 is the stress strain curve figure in example IV；
Figure 14 is the microstructure figure of welding point stretching fracture in example IV.
Wherein, 1 it is molybdenum tube, 2 be end plug, 3 is metallic intermediate layer.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
It is of the present invention to be comprised the following steps based on microalloying with the molybdenum alloy fusion welding method of synchronous parasitic soldering：
1) calmodulin binding domain CaM to be welded for treating welding workpiece is pre-processed, wherein, the material of the workpiece to be welded is molybdenum
Or molybdenum alloy；
2) metallic intermediate layer 3 is filled at the faying face to be welded of workpiece to be welded, then completes the docking of workpiece to be welded, its
In, the fusing point of metallic intermediate layer 3 is less than the fusing point of workpiece to be welded, and the filling region scope covering of metallic intermediate layer 3 was welded
Workpiece arc-seam weld region to be welded and the heat-affected zone of melting welding in journey；
3) workpiece to be welded is placed in the atmosphere of inert gas shielding or in vacuum environment, then treats treating for welding workpiece
Weldering calmodulin binding domain CaM is preheated；
4) fusion welds of workpiece to be welded are completed, during fusion welds, the joint location of workpiece to be welded and its
The metallic intermediate layer 3 of near zone melts, and metallic intermediate layer 3 and the joint location of workpiece to be welded is formed molten soldering smelting
Gold is combined；
5) welding point of welded workpiece is incubated, then the welding point of welded workpiece is placed in inert gas
Room temperature is cooled in protective atmosphere or in vacuum environment, the molybdenum alloy melting welding based on microalloying with synchronous parasitic soldering is completed.
Step 1) in treat the concrete operations that the calmodulin binding domain CaM to be welded of welding workpiece pre-processed and be：By workpiece to be welded
Calmodulin binding domain CaM to be welded polished successively, alkali cleaning, acetone cleaning and dry.
The material of workpiece to be welded is that the molybdenum alloy of pure molybdenum, alloying element content less than or equal to 2wt% or second are mutually adulterated
Thing content is less than or equal to 2wt% molybdenum alloy.
Step 4) in workpiece to be welded is completed using Laser Welding, electron beam weldering, beam-plasma weldering or the method for argon arc welding
Fusion welds.
The welding point form of welded workpiece is pipe/rod casing joint, lap joint, the banjo fixing butt jointing with backing plate, envelope
The cruciform joint of bottom banjo fixing butt jointing, the T connector of incomplete fusion or incomplete fusion.
The material of metallic intermediate layer 3 is Ti, Ni, Zr or Al.
Step 2) in treated by way of directly filling metal foil, sputter coating, plating, cold spraying or laser melting coating
Metallic intermediate layer 3 is filled at the faying face to be welded of welding workpiece.
The purity of metallic intermediate layer 3 is more than or equal to 99.99%.
Step 3) in preheating temperature be 400 DEG C -500 DEG C.
Step 2) in workpiece to be welded docking after the completion of, the butt-joint clearance of workpiece to be welded is less than or equal to 0.1mm, to be welded
The unfitness of butt joint for connecing workpiece joint is less than or equal to the 10% of thickness of workpiece to be welded, and the unfitness of butt joint of workpiece joint to be welded is small
In 0.5mm；
The gap of the overlapping regions of workpiece to be welded filled with metallic intermediate layer 3 is less than or equal to 0.05mm.
Embodiment one
From material of the titanium as metallic intermediate layer 3, because Ti and Mo occurs in the transition process from liquid phase to solid phase
Uniform grain reacts, as shown in figure 1, so that Ti and Mo infinitely dissolves, and brittlement phase will not be generated；The fusing point of Mo-Ti solid solution compared with
Height, and have good mechanical behavior under high temperature；Ti have micro in extremely strong affinity, welding pool to the member such as O under high temperature
Ti elements react with O and Mo, generate MoxTiyOzThe second phase particles of composite oxides, eliminating, impurity element crystal boundary is inclined
While analysis, energy Resistance of Weld Metal plays a part of second phase particles reinforcing.
As shown in Fig. 2 a, Fig. 2 b and Fig. 2 c, three groups of molybdenum alloy light-wall pipe-casing joints of end plug 2 are welded using Laser Welding, its
In, first group is that molybdenum tube 1 and end plug 2 are directly assembled, and second group is to fill titanium foil, the 3rd group in molybdenum tube 1 and the joint of end plug 2
Titanium foil is all filled for the joint and lap-joint in molybdenum tube 1 and end plug 2.Test material is mixed with 0.25wt%La2O3Dispersion-strengtherning
The high-performance molybdenum alloy of phase, size such as Fig. 3 a, Fig. 3 b, Fig. 3 c of experiment high-performance molybdenum alloy thin-wall pipe used, end plug 2 and titanium foil
And shown in Fig. 3 d；Concrete operations are：First the contact site of molybdenum tube 1 and end plug 2 is polished with sand paper, dilute sodium hydroxide water is then used
Solution carries out alkali cleaning, then uses clear water and acetone to be dried up after cleaning successively；Thickness is processed into such as Fig. 3 d for 0.05mm TA1 titanium foils
Illustrated dimension, with the HNO by 12mL3, 6mL HF and 82mL H2The solution that O is formulated carries out pickling, then uses clear water successively
And acetone clean after dry up；Three groups of samples are assembled, then welded successively again, sample is placed in high-purity argon gas protection during welding
In atmosphere, then butt joint is preheated, after connector temperature reaches 500 DEG C, using IPG-4000 types optical fiber laser to weld
Power P is that 1200W, defocusing amount f are that the welding parameter that+1mm, linear velocity v are 0.2m/min is completed to molybdenum tube 1 and end plug 2
Laser Welding boxing, welding point is incubated 30s, is slowly cooled to room temperature again afterwards by postwelding more than 500 DEG C.
Observation is all filled with the welding point cross section (as shown in Figure 4) of the sample of titanium foil in joint and lap-joint.From
As can be seen that molten pricker occurs for the titanium foil fusing filled between the heat affected area of laser welding head, molybdenum tube 1 and end plug 2 in Fig. 4
Weldering, all forms parasitic soldering metallurgical binding between titanium foil and molybdenum tube 1, titanium foil and end plug 2, Mo and Ti occurs at soldering interface
Dissolve each other.
Choose the sample for being not added with titanium foil and be all filled with the sample of titanium foil in joint and lap-joint, respectively the two weldering of measurement
The microhardness of fusion zone is stitched, measurement result is as shown in Fig. 5 a and Fig. 5 b.Through measurement, the micro- hard of molybdenum alloy mother metal used is tested
Degree is about 235HV, and the microhardness for being not added with titanium foil sample weld seam fusion zone is can be seen that from Fig. 5 a and Fig. 5 b compared under mother metal
Drop is obvious, and the range of decrease is about 30HV；The microhardness of sample weld seam of titanium foil is filled with joint and lap-joint compared to mother
Material is reduced only by about 15HV, therefore illustrates that weld strength can really be improved by being used as alloying element by mixing Ti into weld seam.
Respectively measurement the mother metal of molybdenum tube 1 and three bond pads joint samples tensile mechanical properties, stress strain curve as shown in fig. 6,
The tensile strength of the mother metal of molybdenum tube 1 is 720MPa, and elongation reaches 10.6mm during fracture；The tension for being not added with the welding point of titanium foil is strong
Degree only has 124MPa, and elongation is only 0.6mm during fracture；Add the tension of the welding point of titanium foil in molybdenum tube 1 and the joint of end plug 2
Intensity is 606MPa, reaches the 84.2% of mother metal tensile strength, and elongation is 3.1mm during fracture, illustrates to mix Ti into weld seam
The tensile strength of weld seam can be significantly improved as micro alloying element；Simultaneously lap-joint in molybdenum tube 1 and the joint of end plug 2 and all
Plus the tension of the welding point of titanium foil reaches by force the 95.6% of 688MPa, up to mother metal tensile strength, elongation reaches during fracture
9.8mm, illustrates while adding Ti to make weld seam microalloying, the molten soldering land for parasitizing joint made by flame welding heat affected area is played
Auxiliary carrying effect, while welding point tensile strength is further improved, significantly improves the elongation percentage of welding point.
The former breaks in weld seam it can be seen from Fig. 7 a and Fig. 7 b, and the constriction of the latter's molybdenum tube 1 is obvious and breaks since molybdenum tube 1
Split；Welding point all breaks in weld seam when being not added with titanium foil it can be seen from Fig. 8 a and Fig. 8 b, and fracture mode is mainly shown as along crystalline substance
Fracture；The welding point for all filling titanium foil in joint and lap-joint mainly breaks in mother metal, only sub-fraction fracture in weld seam,
And the fracture pattern on the fracture of welding is mainly shown as transcrystalline cleavage fracture.
Embodiment two
From material of the nickel as metallic intermediate layer 3, two groups of molybdenum alloy light-wall pipe-casing joints of end plug 2 and embodiment one
It is identical, wherein, first group is that molybdenum tube 1 is directly assembled with end plug 2, and nickel foil is filled on second group of composition surface in molybdenum tube 1 and end plug 2.
Test material is mixed with 0.25wt%La2O3The high-performance molybdenum alloy of dispersion-strengtherning phase；Specifically fusion welds process is：First by molybdenum
The contact site of pipe 1 and end plug 2 is polished with sand paper, then carries out alkali cleaning with dilute sodium hydroxide aqueous solution, then successively with clear water and
Acetone is cleaned and dried up；Thickness is processed into size as shown in Figure 3 d for 0.05mm nickel foil, is HF with by matching:HNO3:H2O
=2:1:4.5 mix acid liquor carries out pickling, then uses clear water and acetone to be dried up after cleaning successively；Two groups of samples are assembled, then
Fusion welds are carried out successively.Sample is placed in high-purity argon gas protective atmosphere during welding, then butt joint is preheated, works as docking
Head temperature reach after 500 DEG C, using IPG-4000 types optical fiber laser by 1200W of bonding power P, defocusing amount f be+1mm, revolve
Turn the welding parameter that linear velocity v is 0.2m/min to complete to molybdenum tube 1 and the Laser Welding boxing of end plug 2, postwelding exists welding point
More than 500 DEG C are incubated 30s, are then slowly cooled to room temperature again.
The welding point cross section of sample filled with nickel foil is as shown in figure 9, it can be seen in figure 9 that in laser welding
Molten soldering occurs for the heat affected area of head, the nickel foil fusing filled between molybdenum tube 1 and end plug 2, nickel foil and molybdenum tube 1, nickel foil and end plug 2 it
Between all form parasitic soldering metallurgical binding.
Contrast is not added with nickel foil and adds the tensile mechanical properties of the bond pads joint of nickel foil two, and stress strain curve is as shown in Figure 10, no
Plus the tensile strength of the welding point of nickel foil only has 124MPa, elongation is only 0.6mm during fracture；Engaged in molybdenum tube 1 and end plug 2
The tensile strength of the welding point filled with nickel foil is 624MPa at face, reaches mother metal tensile strength (about 720MPa)
86.7%, and elongation is 2.55mm during fracture, illustrates to weld mixed with 0.25wt%La using Laser Welding2O3Dispersion-strengtherning phase
High-performance molybdenum alloy when, by filling nickel foil, in weld metal microalloying and form synchronous parasitic two kinds of mechanism of soldering
Under collective effect, the intensity and elongation percentage of welding point can significantly improve.
Embodiment three
From zirconium metal material, the size and embodiment of molybdenum alloy light-wall pipe-casing joint of end plug 2 are filled as intermediate layer
One is identical, wherein, first group is directly to assemble molybdenum tube 1 and end plug 2, and second group is filled at the composition surface of molybdenum tube 1 and end plug 2
Zirconium paper tinsel, test material is mixed with 0.25wt%La2O3The high-performance molybdenum alloy of dispersion-strengtherning phase, experiment high-performance molybdenum alloy used
Light-wall pipe and the size of end plug 2 are as shown in Fig. 3 a and Fig. 3 b, and specific welding process is：By molybdenum tube 1 and the contact site sand of end plug 2
Paper is polished, and then carries out alkali cleaning with dilute sodium hydroxide aqueous solution, then with clear water and acetone is cleaned and dried up successively；It is by thickness
0.05mm zirconium paper tinsel is processed into size as shown in Figure 3 d, then with by matching is HF:HNO3:H2O=3:45:52 mix acid liquor enters
Row pickling, is dried up after then being cleaned successively with clear water and acetone again；Two groups of samples are assembled, welded successively, during welding
Sample is placed in high-purity argon gas protective atmosphere, then butt joint is preheated, and after connector temperature reaches 500 DEG C, uses IPG-
4000 type optical fiber lasers are by 1200W of bonding power P, defocusing amount f is+1mm, linear velocity v for 0.2m/min welding
Parameter completes the Laser Welding boxing to molybdenum tube 1 and end plug 2, and welding point is incubated 30s, then delayed again by postwelding more than 500 DEG C
Slow cool down is to room temperature.
As shown in figure 11, the welding point cross section of sample of the observation filled with zirconium paper tinsel；It can be seen from fig. 11 that swashing
The heat affected area of flush weld joint, the zirconium paper tinsel fusing filled between molybdenum tube 1 and end plug 2, Zr and Mo phases counterdiffusion generation intermetallic
Metallurgical binding is all formed between thing, zirconium paper tinsel and molybdenum tube 1, zirconium paper tinsel and end plug 2.
Contrast is not added with zirconium paper tinsel and adds the tensile mechanical properties of two bond pads joints of zirconium paper tinsel, and stress strain curve is as shown in figure 12,
The tensile strength for being not added with zirconium paper tinsel welding point is the 17.2% of 124MPa, only mother metal tensile strength (about 720MPa), during fracture
Elongation is only 0.6mm；The tensile strength of the welding point filled with zirconium paper tinsel is 480MPa at molybdenum tube 1 and the composition surface of end plug 2,
Reach the 66.7% of mother metal tensile strength, during fracture elongation be 1.55mm, illustrate using Laser Welding weld mixed with
0.25wt%La2O3During the high-performance molybdenum alloy of dispersion-strengtherning phase, by filling zirconium paper tinsel, in weld metal microalloying and formation
Under the collective effect of synchronous parasitism two kinds of mechanism of soldering, the intensity and elongation percentage of welding point can significantly improve.
Example IV
Aluminium is the material of metallic intermediate layer 3, the casing joint size of molybdenum alloy light-wall pipe-end plug 2 and the phase of embodiment one
Together, wherein, first group is directly assemble molybdenum tube 1 and end plug 2, and second group is the filling aluminum at composition surface of the molybdenum tube 1 with end plug 2
Paper tinsel；Test material is mixed with 0.25wt%La2O3The high-performance molybdenum alloy of dispersion-strengtherning phase, experiment high-performance molybdenum alloy used is thin
Wall pipe and the size of end plug 2 are as shown in Fig. 3 a and Fig. 3 b, and specific welding process is：First by molybdenum tube 1 and the contact site sand of end plug 2
Paper is polished, and alkali cleaning is then carried out with dilute sodium hydroxide aqueous solution, then uses clear water and acetone to be dried up after cleaning successively；It is by thickness
0.05mm aluminium foil is processed into size as shown in Figure 3 d, carries out alkali cleaning to it with dilute sodium hydroxide aqueous solution, then use clear water successively
Dried up after being cleaned with acetone；Two groups of samples are assembled, then welded successively, sample is placed in high-purity argon gas protection during welding
In atmosphere, then butt joint is preheated, after connector temperature reaches 500 DEG C, using IPG-4000 types optical fiber laser to weld
Power P is that 1200W, defocusing amount f are that the welding parameter that+1mm, linear velocity v are 0.2m/min completes molybdenum tube 1 and end plug 2
Laser Welding boxing；Postwelding is incubated 30s by welding point more than 500 DEG C, is then slowly cooled to room temperature again.
Contrast is not added with aluminium foil and adds the tensile mechanical properties of the bond pads joint of aluminium foil two, and stress strain curve is as shown in figure 13, no
Plus 17.2% that the tensile strength of aluminium foil welding point is 124MPa, only mother metal tensile strength (about 720MPa), stretched during fracture
Long amount is only 0.6mm；The tensile strength that the welding point of aluminium foil is filled at molybdenum tube 1 and the composition surface of end plug 2 is 557MPa, is reached
The 77.4% of mother metal tensile strength, elongation is 1.8mm during fracture.Figure 14 is whole disconnected to add aluminium foil sample stretching fracture pattern
Mouth fracture mode illustrates to weld mixed with 0.25wt%La using Laser Welding based on transgranular fracture2O3The high property of dispersion-strengtherning phase
During energy molybdenum alloy, by filling aluminium foil, in weld metal microalloying and the common work of formation two kinds of mechanism of synchronous parasitic soldering
Under, the intensity and elongation percentage of welding point can significantly improve.
Claims (10)
1. a kind of molybdenum alloy fusion welding method based on microalloying with synchronous parasitic soldering, it is characterised in that comprise the following steps：
1) calmodulin binding domain CaM to be welded for treating welding workpiece is pre-processed, wherein, the material of the workpiece to be welded is molybdenum or molybdenum
Alloy；
2) metallic intermediate layer (3) is filled at the faying face to be welded of workpiece to be welded, then completes the docking of workpiece to be welded, its
In, the fusing point of metallic intermediate layer (3) is less than the fusing point of workpiece to be welded, the filling region scope covering weldering of metallic intermediate layer (3)
Workpiece arc-seam weld region to be welded and the heat affected area of melting welding in termination process；
3) workpiece to be welded is placed in the atmosphere of inert gas shielding or in vacuum environment, then treats the knot to be welded of welding workpiece
Region is closed to be preheated；
4) fusion welds of workpiece to be welded are completed, during fusion welds, the joint location of workpiece to be welded and its near
The metallic intermediate layer (3) in region melts, and metallic intermediate layer (3) and the joint location of workpiece to be welded is formed molten soldering smelting
Gold is combined；
5) welding point of welded workpiece is incubated, then the welding point of welded workpiece is placed in inert gas shielding
Room temperature is cooled in atmosphere or in vacuum environment, the molybdenum alloy melting welding based on microalloying with synchronous parasitic soldering is completed.
2. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In step 1) in treat the concrete operations that the calmodulin binding domain CaM to be welded of welding workpiece pre-processed and be：By treating for workpiece to be welded
Weldering calmodulin binding domain CaM polished successively, alkali cleaning, acetone cleaning and dry.
3. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In the material of workpiece to be welded is the molybdenum alloy of pure molybdenum, alloying element content less than or equal to 2wt% or the second phase dopant content
Molybdenum alloy less than or equal to 2wt%.
4. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In step 4) in the melting welding weldering of workpiece to be welded is completed using Laser Welding, electron beam weldering, beam-plasma weldering or the method for argon arc welding
Connect.
5. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In the welding point form of welded workpiece is pipe/rod casing joint, lap joint, the banjo fixing butt jointing with backing plate, back cover docking
The cruciform joint of joint, the T connector of incomplete fusion or incomplete fusion.
6. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In the material of metallic intermediate layer (3) is Ti, Ni, Zr or Al.
7. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In step 2) in by way of directly filling metal foil, sputter coating, plating, cold spraying or laser melting coating to be welded
Metallic intermediate layer (3) is filled at the faying face to be welded of workpiece.
8. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In the purity of metallic intermediate layer (3) is more than or equal to 99.99%.
9. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In step 3) in preheating temperature be 400 DEG C -500 DEG C.
10. the molybdenum alloy fusion welding method according to claim 1 based on microalloying with synchronous parasitic soldering, its feature exists
In step 2) in workpiece to be welded docking after the completion of, the butt-joint clearance of workpiece to be welded is less than or equal to 0.1mm, work to be welded
The unfitness of butt joint of part joint is less than or equal to the 10% of thickness of workpiece to be welded, and the unfitness of butt joint of workpiece joint to be welded is less than
0.5mm。
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| CN201710284251.0A CN107008985B (en) | 2017-04-26 | 2017-04-26 | Molybdenum alloy fusion welding method based on micro-alloying and synchronous parasitic brazing |
| PCT/CN2018/080433 WO2018196524A1 (en) | 2017-04-26 | 2018-03-26 | Molybdenum alloy fusion welding method based on micro-alloying and synchronized parasitic brazing |
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| CN201710284251.0A CN107008985B (en) | 2017-04-26 | 2017-04-26 | Molybdenum alloy fusion welding method based on micro-alloying and synchronous parasitic brazing |
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| WO2018196524A1 (en) * | 2017-04-26 | 2018-11-01 | 西安交通大学 | Molybdenum alloy fusion welding method based on micro-alloying and synchronized parasitic brazing |
| CN109943802A (en) * | 2019-04-22 | 2019-06-28 | 西安交通大学 | The method for improving molybdenum and molybdenum alloy fusion welding seam intensity by pack carburizing mode |
| CN110340505A (en) * | 2019-06-25 | 2019-10-18 | 西安交通大学 | A kind of Mo alloy lap joint electric resistance welding method adding titanium foil |
| CN112222614A (en) * | 2020-08-27 | 2021-01-15 | 西安交通大学 | Method for improving molybdenum and molybdenum alloy laser welding head in nitrogen alloying mode |
| CN113732504A (en) * | 2021-09-18 | 2021-12-03 | 西安交通大学 | Method for strengthening welding performance of tungsten/molybdenum and alloy thereof by ODS |
| CN113894420A (en) * | 2021-10-27 | 2022-01-07 | 西安交通大学 | Local vacuum laser welding method for tungsten/molybdenum and alloy component thereof |
| CN115415623A (en) * | 2022-08-05 | 2022-12-02 | 西安交通大学 | Assembling and welding method for molybdenum alloy heat pipe sleeve joint |
| CN117655530A (en) * | 2024-02-02 | 2024-03-08 | 安徽瑞控信光电技术股份有限公司 | Quick reflection mirror, cross flexible supporting structure of quick reflection mirror and forming process method of cross flexible supporting structure |
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| CN112222614A (en) * | 2020-08-27 | 2021-01-15 | 西安交通大学 | Method for improving molybdenum and molybdenum alloy laser welding head in nitrogen alloying mode |
| CN113732504A (en) * | 2021-09-18 | 2021-12-03 | 西安交通大学 | Method for strengthening welding performance of tungsten/molybdenum and alloy thereof by ODS |
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| CN117655530A (en) * | 2024-02-02 | 2024-03-08 | 安徽瑞控信光电技术股份有限公司 | Quick reflection mirror, cross flexible supporting structure of quick reflection mirror and forming process method of cross flexible supporting structure |
Also Published As
| Publication number | Publication date |
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| CN107008985B (en) | 2020-03-31 |
| WO2018196524A1 (en) | 2018-11-01 |
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