CN110541093B - Metal filling material for regulating brittle phase in titanium-aluminum dissimilar metal welding joint and application thereof - Google Patents
Metal filling material for regulating brittle phase in titanium-aluminum dissimilar metal welding joint and application thereof Download PDFInfo
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- CN110541093B CN110541093B CN201910885986.8A CN201910885986A CN110541093B CN 110541093 B CN110541093 B CN 110541093B CN 201910885986 A CN201910885986 A CN 201910885986A CN 110541093 B CN110541093 B CN 110541093B
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- 239000000463 material Substances 0.000 title claims abstract description 66
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 64
- 239000002184 metal Substances 0.000 title claims abstract description 64
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 21
- 238000004021 metal welding Methods 0.000 title claims abstract description 17
- 238000003466 welding Methods 0.000 claims abstract description 85
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000945 filler Substances 0.000 claims abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 23
- 230000001276 controlling effect Effects 0.000 claims abstract description 18
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 14
- 229910052709 silver Inorganic materials 0.000 claims abstract description 11
- 239000004332 silver Substances 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 239000010703 silicon Substances 0.000 claims abstract description 10
- 229910000838 Al alloy Inorganic materials 0.000 claims description 37
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 8
- 238000010894 electron beam technology Methods 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 1
- 229910052719 titanium Inorganic materials 0.000 abstract description 13
- 229910004349 Ti-Al Inorganic materials 0.000 abstract description 8
- 229910004692 Ti—Al Inorganic materials 0.000 abstract description 8
- 238000009792 diffusion process Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 229910010039 TiAl3 Inorganic materials 0.000 abstract description 4
- 229910000765 intermetallic Inorganic materials 0.000 abstract description 4
- 239000011159 matrix material Substances 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 230000002452 interceptive effect Effects 0.000 abstract description 2
- 239000003973 paint Substances 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 35
- 239000010936 titanium Substances 0.000 description 15
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 7
- 210000001503 joint Anatomy 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000012255 powdered metal Substances 0.000 description 4
- 238000002203 pretreatment Methods 0.000 description 4
- 239000011863 silicon-based powder Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910019752 Mg2Si Inorganic materials 0.000 description 1
- 229910010038 TiAl Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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- 238000003672 processing method Methods 0.000 description 1
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- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
-
- 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
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—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
- B23K26/20—Bonding
- B23K26/21—Bonding by 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
Abstract
The invention provides a metal filling material for regulating and controlling brittle phases in a titanium-aluminum dissimilar metal welding joint and application thereof, belonging to the technical field of welding fillers. The paint comprises the following components in percentage by mass: 68-78% of aluminum, 8-15% of silicon, 8-18% of nickel and 6-16% of silver. The Si in the metal filling material of the invention can delay TiAl3Formation of intermetallic compounds; since the mutual diffusion coefficient of Ni and Ti is larger than that of Al and Ti, the added Ni can be preferentially combined with Ti in a diffusion way to interfere the generation of Ti-Al brittle phase; ag can diffuse into the grain boundary of the Al matrix in a relatively fast mode, and plays a role in interfering and blocking the generation of Ti-Al brittle phases. The metal filling material can be suitable for various welding methods and is flexible to apply. The example data shows that: the average tensile strength of the welded joint obtained by adopting the metal filling material is more than 230 MPa.
Description
Technical Field
The invention relates to the technical field of welding filler, in particular to a metal filling material for regulating and controlling brittle phases in a titanium-aluminum dissimilar metal welding joint and application thereof.
Background
At present, in the high and new technical fields of aerospace, weaponry and the like, the aluminum alloy is widely applied by virtue of the characteristics of low density and good economy; titanium alloy is one of the important new materials for aerospace development because of its advantages of light weight, high specific strength, impact resistance, wear resistance, etc. With the increasing requirements of the aircraft engine and aircraft structure design on the thrust-weight ratio, the demand on the titanium alloy and aluminum alloy composite structure is more and more urgent. The titanium/aluminum composite component has the excellent performances of high strength-to-weight ratio, good fatigue resistance, good stability, higher vibration resistance limit and the like, and has wide application prospect in the fields of aerospace, weaponry, transportation and the like. However, during aluminum/titanium welding, due to the large difference of the thermal and physical properties of the two components, the residual stress of the welded joint is large and easy to deform, and the two components are metallurgically incompatible, a brittle phase is easily formed at a welding seam interface, so that the performance of the joint is obviously reduced, and the titanium/aluminum composite component is difficult to apply in a large amount.
At present, two measures are taken for improving the titanium/aluminum welding joint, one is that a high-energy beam processing method such as vacuum electron beam welding or laser welding is used, the precise deviation of the beam is utilized to carry out melting-brazing, the temperature at the interface is reduced as much as possible, and the number of brittle phases is reduced, so that the strength of the joint is improved; secondly, solid phase welding is adopted and three-party elements are introduced, so that the number of brittle phases is reduced, and the generation of partial brittle phases is blocked, so that the types of the brittle phases are reduced, and the strength of the joint is improved. Both measures are costly and require high demands on the operator, which is greatly limited in industrial production. Today, manual fusion welding is still predominant in industrial applications, but there is a lack of a suitable process to reduce the generation of brittle phases.
Disclosure of Invention
In view of the above, the present invention provides a metal filling material for regulating and controlling a brittle phase in a titanium-aluminum dissimilar metal welded joint and a preparation method thereof. When the metal filling filler provided by the invention is applied to welding aluminum alloy and titanium alloy, the generation of Ti-Al brittle phase can be effectively inhibited.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a metal filling material for regulating and controlling brittle phases in a titanium-aluminum dissimilar metal welding joint, which comprises the following components in percentage by mass: 68-78% of aluminum, 8-15% of silicon, 8-18% of nickel and 6-16% of silver.
Preferably, the metal filling material comprises the following components in percentage by mass: 73% of aluminum, 10% of silicon, 9% of nickel and 8% of silver.
Preferably, the metallic filler material is in the form of a powder or a weld wire.
The invention also provides application of the metal filling material for regulating and controlling the brittle phase in the titanium-aluminum dissimilar metal welding joint in the technical scheme in welding titanium alloy and aluminum alloy.
Preferably, the application comprises the steps of:
(1) respectively preprocessing an aluminum alloy plate and a titanium alloy plate, and then assembling the preprocessed aluminum alloy plate, the preprocessed titanium alloy plate and a metal filling material to obtain an assembled workpiece;
(2) and (2) welding the assembled workpiece obtained in the step (1).
Preferably, when the metallic filler material is in a powder form, the assembling includes: and polishing the pre-treated aluminum alloy plate into a groove angle of 45-60 degrees, and then filling the powdery metal filling material into a single V-shaped groove formed by the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate to enable the powdery metal filling material to be flush with the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate.
Preferably, when the metallic filler material is in the form of a weld wire, the assembling comprises: and placing the welding wire-shaped metal filling material at the welding position of the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate.
Preferably, the welding of step (2) comprises TIG welding, laser welding or electron beam welding.
Preferably, the welding wire used for TIG welding is a pure aluminum welding wire.
Preferably, the welding current of the TIG welding is 100-115A, the welding voltage is 9-10V, and the welding speed is 75-100 mm/min.
The invention provides a metal filling material for regulating and controlling brittle phases in a titanium-aluminum dissimilar metal welding joint, which comprises the following components in percentage by mass: 68-78% of aluminum, 8-15% of silicon, 8-18% of nickel and 6-16% of silver. In the metal filling material provided by the invention, Si plays a role in delaying TiAl3Formation of intermetallic compounds; since the mutual diffusion coefficient of Ni and Ti is larger than that of Al and Ti, the added Ni can be preferentially combined with Ti in a diffusion way to interfere the generation of Ti-Al brittle phase; ag can diffuse into the grain boundary of Al matrix in a relatively fast way, and generates Ti-Al brittle phaseSo as to play a role in interference resistance. The data of the examples show that: the brittle phase of the welding joint obtained by adopting the metal filling material is reduced, the mechanical property of the welding joint is improved, and the average tensile strength of the welding joint is more than 230 MPa.
Drawings
FIG. 1 is an EDS line scan photograph of a weld joint obtained in example 1;
FIG. 2 is an EDS line scan photograph of a weld joint obtained in example 2;
FIG. 3 is an EDS line scan photograph of a weld joint obtained in comparative example 1;
FIG. 4 is an XRD spectrum of a weld joint obtained in example 1;
FIG. 5 is an XRD spectrum of a weld joint obtained in example 2;
fig. 6 is an XRD spectrum of the welded joint obtained in comparative example 1.
Detailed Description
The invention provides a metal filling material for regulating and controlling brittle phases in a titanium-aluminum dissimilar metal welding joint, which comprises the following components in percentage by mass: 68-78% of aluminum, 8-15% of silicon, 8-18% of nickel and 6-16% of silver.
The metal filling material for regulating and controlling the brittle phase in the titanium-aluminum dissimilar metal welding joint comprises 68-78% by mass of aluminum, preferably 70-76%, and further preferably 72-74%.
The metal filling material for regulating and controlling the brittle phase in the titanium-aluminum dissimilar metal welding joint comprises 8-15% by mass of silicon, preferably 9-14%, and further preferably 10-12%. In the present invention, the addition of silicon can enhance the fluidity of the metal filler material.
The metal filling material for regulating and controlling the brittle phase in the titanium-aluminum dissimilar metal welding joint comprises 8-18% of nickel by mass, preferably 9-16% of nickel by mass, and further preferably 12-14% of nickel by mass.
The metal filling material for regulating and controlling the brittle phase in the titanium-aluminum dissimilar metal welding joint comprises 6-16% of silver by mass, preferably 8-14% of silver by mass, and further preferably 10-12% of silver by mass.
In a specific embodiment of the invention, the metal filling material for regulating and controlling the brittle phase in the titanium-aluminum dissimilar metal welded joint preferably comprises the following components in percentage by mass: 73% of aluminum, 10% of silicon, 9% of nickel and 8% of silver.
In the invention, the metal filling material for regulating the brittle phase in the titanium-aluminum dissimilar metal welding joint is preferably in a powder or welding wire shape. The preparation method of the metal filling material is not particularly limited, and a preparation method well known to those skilled in the art can be adopted.
In the present invention, when the metal filler is in a powder form, the preparation method of the metal filler preferably includes mixing aluminum powder, nickel powder, silicon powder, and silver powder in proportion. In the present invention, the particle size of the nickel powder is preferably 325 mesh, the particle size of the silver powder is preferably 300 mesh, the particle size of the silicon powder is preferably 400 mesh, and the particle size of the aluminum powder is preferably 400 mesh. The present invention is not particularly limited to the mixing method.
In the invention, when the metal filling material is in a welding wire shape, the preparation method of the welding wire-shaped metal filling material is not particularly limited, and a conventional welding wire manufacturing process is adopted.
In the present invention, the Si functions to retard TiAl3Formation of intermetallic compounds; since the mutual diffusion coefficient of Ni and Ti is larger than that of Al and Ti, the added Ni can be preferentially combined with Ti in a diffusion way to interfere the generation of Ti-Al brittle phase; ag can diffuse into the grain boundary of the Al matrix in a relatively fast mode, and plays a role in interfering and blocking the generation of Ti-Al brittle phases.
The invention also provides application of the metal filling material for regulating and controlling the brittle phase in the titanium-aluminum dissimilar metal welding joint in the technical scheme in welding titanium alloy and aluminum alloy. The types of the titanium alloy and the aluminum alloy are not particularly limited, and any type of titanium alloy and aluminum alloy can be used. In a specific embodiment of the invention, the titanium alloy is preferably TC4, and the aluminum alloy is preferably 2a 14.
In the present invention, the application preferably comprises the steps of:
(1) respectively preprocessing an aluminum alloy plate and a titanium alloy plate, and then assembling the preprocessed aluminum alloy plate, the preprocessed titanium alloy plate and a metal filling material to obtain an assembled workpiece;
(2) and (2) welding the assembled workpiece obtained in the step (1).
According to the invention, after the aluminum alloy plate and the titanium alloy plate are respectively pretreated, the pretreated aluminum alloy plate, the pretreated titanium alloy plate and the metal filling material are assembled to obtain an assembled workpiece.
In the present invention, the pretreatment preferably comprises the steps of: and (3) brushing the butt joint surface of the titanium alloy plate and the aluminum alloy plate within 20mm by using a steel wire brush to expose the metallic luster.
In the present invention, when the metallic filler material is in a powder form, the assembling preferably includes: and polishing the pre-treated aluminum alloy plate into a groove angle of 45-60 degrees, and then filling the powdery metal filling material into a single V-shaped groove formed by the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate to enable the powdery metal filling material to be flush with the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate. If the bevel is formed on one side of the titanium alloy, the contact area between the metal filling material and the titanium alloy is increased, and the main element in the metal filling material is aluminum, so that the condition of generating a brittle phase is increased; meanwhile, the diffusion speed of titanium to aluminum is higher than that of aluminum to titanium, so that the contact between titanium and aluminum is reduced as much as possible. Therefore, the opening is formed only in the aluminum alloy side, and the formation of Ti-Al brittle phase can be further suppressed.
In the present invention, when the metallic filler material is in the form of a solder wire, the assembling preferably includes: and placing the welding wire-shaped metal filling material at the welding position of the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate.
After the assembly is finished, the present invention preferably further comprises: acetone was used to clean the interface and surrounding metal.
After the assembled workpiece is obtained, the invention welds the assembled workpiece. In the present invention, the welding preferably includes TIG welding, laser welding or electron beam welding. The metal filling material provided by the invention is suitable for various welding modes and is more flexible to apply.
In the invention, when the welding method is preferably TIG welding, the welding wire used for TIG welding is preferably pure aluminum welding wire; the welding current of TIG welding is preferably 100-115A, the welding voltage is preferably 9-10V, and the welding speed is preferably 75-100 mm/min; the TIG welding is preferably single-pass butt welding. In the present invention, when the welding method is preferably TIG welding and the metal filler is in a powder form, it is preferable that a welding torch of TIG welding is swung to both sides to complete welding when welding is performed; the swing amplitude of the welding gun is not particularly limited, and the swing amplitude can be determined by a person skilled in the art after trial welding according to the thickness of a welded plate and welding parameters.
The following will explain the metallic filling material for regulating brittle phase in a titanium aluminum dissimilar metal welded joint and its application in detail with reference to the examples, but they should not be construed as limiting the scope of the invention.
Example 1
A powdery metal filling material for regulating and controlling brittle phases in a titanium-aluminum dissimilar metal welding joint comprises the following components in percentage by mass: 73% of 400-mesh aluminum powder, 10% of 400-mesh silicon powder, 9% of 325-mesh nickel powder and 8% of 300-mesh silver powder.
The application method of the metal filling material comprises the following steps:
(1) brushing the butt joint surfaces of TC4 titanium alloy and 2A14 aluminum alloy plates within 20mm by using a steel wire brush to expose metallic luster to obtain a pretreated titanium alloy plate and an aluminum alloy plate; then, polishing the pre-treated aluminum alloy plate into a groove angle of 45 degrees by using an angle grinder, cleaning a welding seam within a range of 20mm by using a steel wire brush and acetone, and then fixing the welding seam in a tool clamp; uniformly filling a powdery metal filling material into a single V-shaped groove formed by the pre-treatment titanium alloy plate and the pre-treatment aluminum alloy plate, wherein the upper surface of the metal filling material is flush with the surfaces of the pre-treatment titanium alloy plate and the pre-treatment aluminum alloy plate, so as to obtain an assembled workpiece;
(2) and selecting an alternating current mode, setting the current of a welding machine to be 110A, performing TIG welding on the assembled workpiece by using a frustum-shaped tungsten electrode, arcing on one side of the aluminum alloy, swinging for about 3mm to one side of the titanium alloy at a constant speed, and performing reciprocating welding in the way.
Example 2
A powdery metal filling material for regulating and controlling brittle phases in a titanium-aluminum dissimilar metal welding joint comprises the following components in percentage by mass: 68% of 400-mesh aluminum powder, 12% of 400-mesh silicon powder, 10% of 325-mesh nickel powder and 10% of 300-mesh silver powder.
The application method of the above-described metal filler is the same as in example 1.
Comparative example 1
Similar to example 1, except that no powdered metal filler material was added.
Fig. 1, 2 and 3 are EDS line scan photographs of the welded joints obtained in example 1, example 2 and comparative example 1, respectively, from which it can be seen that: after the addition of the metallic filler material, the thickness of the intermetallic layer (about 7 μm) is less than the thickness of the intermetallic layer (about 10 μm) in the joint without the addition of the metallic filler material.
Examples 4, 5 and 6 are XRD spectra of the welded joints obtained in example 1, example 2 and comparative example 1, respectively, and it can be seen from fig. 4 to 6 that: after addition of the powdered metal filler, Ag is formed in the resulting weld joint3Al，AgTi3，Mg2Si and Al3Ni2The intermetallic compound and a certain brittle phase TiAl exist at the same time3When no powdered metal filler is added, Ti is mainly used in the welded joint3Al，TiAl2，Ti2Al5The presence of these brittle phases is a major factor in reducing the welded joint.
The properties of the welded joints obtained in example 1, example 2 and comparative example 1 were measured, and the results are shown in table 1. As can be seen from table 1: when the powdered metal filler was not added, the average tensile strength of the joint was 216.67MPa, and the average tensile strength of the joint increased to 238.89MPa when the metal filler obtained in example 1 was added, and the average tensile strength of the joint was 230.48MPa when the metal filler obtained in example 2 was added.
Table 1 results of performance test of welded joints obtained in example 1, example 2 and comparative example 1
| Performance of | Tensile strength/MPa |
| Example 1 | 238.89 |
| Example 2 | 230.48 |
| Comparative example 1 | 216.67 |
Under the same welding conditions, the welding joint added with the metal filling material of the invention has the average tensile strength 7.3 percent higher than that of the welding joint without the metal filling material, and a plastic deformation stage appears in a tensile curve, and a brittle phase, particularly TiAl3The reduction in phase content promotes the transition from brittle fracture to ductile fracture in the joint. By adding the metal filling material, the purposes of regulating and controlling the brittle phase and improving the performance of the joint are achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The metal filling material for regulating and controlling the brittle phase in the titanium-aluminum dissimilar metal welding joint is characterized by comprising the following components in percentage by mass: 68-78% of aluminum, 8-15% of silicon, 8-18% of nickel and 6-16% of silver.
2. The metal filling material according to claim 1, which is composed of the following components in percentage by mass: 73% of aluminum, 10% of silicon, 9% of nickel and 8% of silver.
3. Metallic filler material according to claim 1 or 2, characterized in that it is in powder form or in the form of a weld wire.
4. Use of the metallic filler material for controlling brittle phase in a titanium-aluminum dissimilar metal welded joint according to any one of claims 1 to 3 for welding titanium alloy and aluminum alloy.
5. Use according to claim 4, characterized in that it comprises the following steps:
(1) respectively preprocessing an aluminum alloy plate and a titanium alloy plate, and then assembling the preprocessed aluminum alloy plate, the preprocessed titanium alloy plate and a metal filling material to obtain an assembled workpiece;
(2) and (2) welding the assembled workpiece obtained in the step (1).
6. Use according to claim 5, wherein, when the metallic filler material is in powder form, the fitting comprises: polishing the pre-treated aluminum alloy plate into a groove angle of 45-60 degrees, and filling the powdery metal filling material into a single V-shaped groove formed by the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate to enable the powdery metal filling material to be flush with the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate.
7. The use according to claim 5, wherein, when the metallic filler material is in the form of a welding wire, the assembling comprises: and placing the welding wire-shaped metal filling material at the welding position of the pre-treated aluminum alloy plate and the pre-treated titanium alloy plate.
8. Use according to claim 5, characterized in that the welding of step (2) comprises TIG welding, laser welding or electron beam welding.
9. Use according to claim 8, characterised in that the welding wire used for TIG welding is a pure aluminium wire.
10. The use according to claim 8 or 9, characterized in that the TIG welding has a welding current of 100 to 115A, a welding voltage of 9 to 10V and a welding speed of 75 to 100 mm/min.
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