CN114734142A - Thick-wall narrow-gap welding method for refining TC4 titanium alloy weld structure grains - Google Patents
Thick-wall narrow-gap welding method for refining TC4 titanium alloy weld structure grains Download PDFInfo
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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
- B23K26/20—Bonding
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- 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
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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
- B23K26/60—Preliminary treatment
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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
- B23K26/70—Auxiliary operations or equipment
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B23K2103/00—Materials to be soldered, welded or cut
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- B23K2103/14—Titanium or alloys thereof
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Abstract
The invention discloses a thick-wall narrow-gap welding method for refining TC4 titanium alloy weld joint structure grains, and belongs to the technical field of welding. The thick-wall narrow-gap welding method for refining TC4 titanium alloy grains comprises the following steps: s100, performing groove machining on the thick-wall titanium alloy plate to be welded, performing pretreatment after the groove machining is completed, and then clamping; s200, under the protection of inert shielding gas, performing laser flux-cored wire welding in a laser beam space spiral swinging mode; and S300, cleaning the welding bead after the single-layer welding is finished, and then repeating the single-layer and single-pass welding until the welding bead is filled, thereby finishing the welding. The invention realizes the grain refinement of the titanium alloy narrow gap welding seam structure, greatly improves the impact toughness of the titanium alloy welding joint, and improves the impact toughness of the welding joint by about 50 percent compared with the base metal.
Description
Technical Field
The invention relates to a thick-wall narrow-gap welding method for refining TC4 titanium alloy weld joint structure grains, and belongs to the technical field of welding.
Background
The titanium alloy has the characteristics of high melting point, high specific strength, corrosion resistance, no toxicity, low modulus, no magnetism and the like, and is widely applied to the fields of national defense, military industry, aerospace and the like. At present, the thick-wall titanium alloy is often welded by non-consumable electrode gas shielded welding (TIG), Electron Beam Welding (EBW) and other welding methods. The bevel processing angle of the thick-wall non-consumable electrode gas shielded welding (TIG) is generally required to be more than 30 degrees, the welding efficiency is low, the welding deformation and the residual stress are large, and defects easily exist in a welding line; the Electron Beam Welding (EBW) has high energy density and large depth-to-width ratio of a welding seam, and is suitable for welding thick-wall materials, but the method needs to be carried out under the vacuum condition, the size of a workpiece to be welded is limited by a vacuum chamber, and the welding of large-size thick-wall members is difficult to realize. The laser filler wire welding has the advantages of small welding heat input, accurate energy regulation, weld joint structure regulation and the like, so the laser filler wire welding technology becomes a trend for realizing the efficient connection of the titanium alloy thick wall and the ultra-narrow gap. However, the problem that the impact toughness is reduced due to coarsening of crystal grains of the conventional thick-wall titanium alloy narrow-gap laser filler wire welding joint is solved by greatly limiting the development of the thick-wall narrow-gap laser filler wire welding technology in the field of titanium alloys, and the method is a key technology for widely applying titanium alloy thick-wall narrow-gap welding components.
The grain size of the welding joint is an important parameter for describing the structure characteristics of the joint, and the strength, the plasticity and the impact toughness of the titanium alloy welding joint are greatly improved along with the refinement of the grain size of the welding joint; the specific strength is improved through the grain refinement of the titanium alloy welding joint, and the size and the weight of the component can be reduced; the impact toughness is improved through the grain refinement of the titanium alloy welding joint, and the service life of the joint can be prolonged. At present, the commonly used methods for refining grains of titanium alloy welding joints mainly comprise methods of regulating and controlling multi-element alloy structures, applying energy fields (ultrasound, hammering, magnetic fields) and the like. The grains can be obviously refined by adopting a multi-element alloy solid welding wire regulation and control method, but the method needs to simultaneously feed a plurality of welding wires or smelt the solid welding wires of a new alloy system, so that the production cost is obviously increased; the method of applying external energy field (ultrasonic, hammering, magnetic field) needs to purchase equipment, and is not practical in practical production. Therefore, the development of a welding method with refined welding joint grains, high efficiency and low cost has great significance.
Disclosure of Invention
The invention provides a thick-wall narrow-gap welding method for refining TC4 titanium alloy grains based on the problems.
A thick-wall narrow gap welding method for refining TC4 titanium alloy grains comprises the following steps:
s100, performing groove machining on the thick-wall titanium alloy plate to be welded, performing pretreatment after the groove machining is completed, and then clamping;
s200, under the protection of inert protective gas, welding a laser flux-filled core welding wire in a laser space spiral swinging mode;
and S300, cleaning the welding bead after the single-layer welding is finished, and then repeating the single-layer and single-pass welding until the welding bead is filled, thereby finishing the welding.
Further, in S100, the thickness of the titanium alloy plate to be welded with the thick wall is 20mm to 80 mm.
Further, in S100, the specific parameters of groove preparation are: the groove is Y-shaped or X-shaped, the truncated edge of the groove is 4-6 mm, and the angle of the single groove is 1-3 degrees.
Further, in S100, the pretreatment includes grinding and acid washing, and the specific process of acid washing is as follows: in HF and HNO3Soaking the mixed solution for 15-20 min, then washing and drying the solution by using clear water, and then using HF and HNO3The volume fraction of HF in the mixed solution is 2-4%, and HNO330-40% by volume, and the balance of H2O。
Further, in S200, the parameters of the laser flux cored wire bonding are set as: the filler metal is a titanium alloy flux-cored wire, the laser beam and the normal line of the plate form a first included angle, the welding wire and the plate form a second included angle, the incident point of the laser beam and the end part of the welding wire are arranged without intervals, the first included angle is 10-15 degrees, and the second included angle is 30-60 degrees.
Further, in S200, inert shielding gas is fed through a shielding gas cover and then is subjected to gas feeding protection, gas is fed before welding, gas is stopped after welding, wherein the inert shielding gas is high-purity argon with the purity of 99.99-99.999%, and the flow of the shielding gas is 15-30L/min.
Further, in S200, the flux-cored wire performs the proportioning of the alloy system according to the grain size, service conditions and mechanical properties of the welded joint, wherein the flux-cored wire is formed by combining a TA1 titanium alloy metal sheath and a powder core of the required alloy system.
Further, in S200, the laser swing mode is a spatial spiral laser swing mode, the swing frequency of the spatial spiral laser swing mode is 100Hz to 300Hz, the swing amplitude is 1mm to 3mm, and the helix angle is 20 ° to 30 °.
Furthermore, in S200, the laser power is 3000W-6000W, the defocusing amount is-10 mm- +20mm, and the welding speed is 0.3 m/min-0.8 m/min.
Further, in S300, the cleaning bead is a mechanical cleaning or a laser cleaning method for removing an oxide between the weld layers.
The invention has the following beneficial effects:
the invention is applied to the titanium alloy narrow gap welding in a mode of combining a laser beam space spiral swinging mode with a flux-cored wire added with refined grain alloy elements. In order to ensure the thinning of the narrow gap welding seam structure of the titanium alloy, the two parts are combined with each other. On the premise of ensuring the welding quality, compared with a titanium alloy laser filled solid welding wire, the invention realizes the grain refinement of the titanium alloy narrow gap welding seam structure, greatly improves the impact toughness of the titanium alloy welding joint, improves the impact toughness of the welding joint by about 50 percent compared with the base metal, and can realize large-scale industrial popularization and application.
The invention has the beneficial effects that:
the invention is applied to the titanium alloy narrow gap welding in a mode of combining the spatial spiral swinging laser beam with the flux-cored wire added with refined grain alloy elements. The welding manufacturability is good, and the comprehensive mechanical property is excellent. Has better application prospect, and has the following specific advantages:
(1) the invention provides metal powder for refining grains for a molten pool through the multi-alloy system flux-cored wire, and reduces the smelting cost and time cost required by developing a new alloy system solid wire.
(2) The flux-cored wire obtained by strictly regulating and controlling the proportion of each metal powder obviously improves the plasticity and toughness of the narrow-gap welding joint. The introduction of V and Mo in the metal powder stabilizes the beta phase in the weld structure, provides nucleation points and refines crystal grains. Less than or equal to 2.5 percent of Fe is introduced to react with oxygen element in the molten pool to generate Fe2O3Removing oxygen from the weld to purify the weld pool, resulting in Fe2O3Is easily suspended on the surface of the molten pool, forms slag to facilitate removal of the slag and a limited amount of Fe to avoid formation of brittle intermetallics. By beneficial addition of Mo, V and Al in the flux core and reasonable control of the proportion, alpha' martensite nucleation particles are increased, crystal grains are refined, and good toughness matching of the joint is realized.
(3) The invention can realize the real-time, uniform and periodic stirring of the three-dimensional space of the molten pool by adopting a space spiral swinging laser welding mode. The spatial spiral swinging laser beam can uniformly distribute metal powder provided by the multi-alloy system flux-cored wire in the three-dimensional space of the welding seam area, so that the composition segregation of the welding seam tissue is avoided, and the uniform refinement of crystal grains in the welding seam area is realized; meanwhile, the porosity of the welding seam is reduced, the fusion of the side wall is enhanced, and the welding quality is ensured.
In order to ensure the refining of the narrow-gap welding seam of the titanium alloy, the space spiral swing and the flux-cored wire added with refined grain alloy elements are combined with each other. On the premise of ensuring the welding quality, compared with a titanium alloy laser filled solid welding wire, the invention realizes the refinement of titanium alloy narrow gap welding grains, greatly improves the impact toughness of a titanium alloy welding joint, improves the impact toughness of the welding joint by about 50 percent compared with a base metal, and can realize large-scale industrial popularization and application.
Drawings
FIG. 1 is a schematic view of a welding process;
FIG. 2 is a schematic diagram of the groove size of a narrow gap butt test;
FIG. 3 is a 20mm thick TC4 titanium alloy narrow gap weld joint macro topography, wherein FIG. 3(a) is a frontal image; FIG. 3(b) is a back image; FIG. 3(c) is a sectional view;
FIG. 4 is a narrow gap weld joint microstructure.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the invention provides a thick-wall narrow gap welding method for refining TC4 titanium alloy grains, and the thick-wall narrow gap welding method for refining TC4 titanium alloy grains comprises the following steps:
s100, performing groove machining on the thick-wall titanium alloy plate to be welded, performing pretreatment after the groove machining is completed, and then clamping;
s200, under the protection of inert protective gas, welding a laser flux-filled core welding wire in a laser space spiral swinging mode;
and S300, cleaning a weld bead after the single-layer welding is finished, and then repeating the single-layer welding until the weld joint is filled, thereby finishing the welding.
Specifically, the method is applied to titanium alloy narrow gap welding in a mode of combining the spatial spiral swinging laser beam with the refined crystal grain and multi-alloy system flux-cored wire. In order to ensure the thinning of the narrow gap welding seam of the titanium alloy, the two welding seams are combined with each other. If a spatial spiral swinging laser welding mode is not adopted, when other heat sources such as non-consumable electrode gas shielded welding (TIG) are adopted as the heat sources, the energy of the heat sources is dispersed, the energy density of the heat sources needs to be increased in order to ensure that welding wires are fully melted, a large amount of alloy elements are burnt, important elements for refining grains cannot be transited to a molten pool, and the effect of refining the grains cannot be realized; meanwhile, the heat source has dispersed energy density, long weld solidification time and poor molten pool fluidity, increases the tendency of anisotropy of a welding joint, and ensures that alloy elements for refining grains are difficult to be uniformly distributed in the welding joint, thereby causing local grain refinement of the welding joint and failing to improve the overall mechanical property of the welding joint; when the weaving laser welding (weaving method of circular, vertical, infinity, 8, etc.) is adopted, it is difficult to achieve uniform distribution of alloy elements of refined crystal grains in a three-dimensional space. If the flux-cored wire is not adopted for multi-component alloy regulation, a mode of feeding multiple wires and smelting new solid welding wires is needed, a wire feeder is needed to be added in the multi-wire feeding method, the production cost is high, the condition that multiple wires are fed simultaneously is difficult to realize due to small groove gaps in the narrow-gap welding process, and the production period is long and the cost is high if the new solid welding wires are smelted. Therefore, the optimal effect can be realized only by tightly combining the two measures in sequence while ensuring the grain refinement of the welding joint and ensuring high efficiency and low cost.
Further, in S100, the thickness of the titanium alloy plate to be welded with the thick wall is 20mm to 80 mm.
Further, in S100, the specific parameters of groove preparation are as follows: the bevel is Y-shaped or X-shaped, the truncated edge of the bevel is 4-6 mm, and the angle of the single bevel is 1-3 degrees.
Further, in S100, the pretreatment includes grinding and acid washing, and the specific process of acid washing is as follows: in HF and HNO3Soaking the mixed solution for 15-20 min, then washing and drying the solution by using clear water, and then using HF and HNO3The volume fraction of HF in the mixed solution is 2-4%, and HNO330-40% by volume, and the balance of H2O。
Further, in S200, the parameters of the laser flux cored wire bonding are set as: the filler metal is a titanium alloy flux-cored wire, the laser beam and the normal line of the plate form a first included angle, the welding wire and the plate form a second included angle, the incident point of the laser beam and the end part of the welding wire are arranged without intervals, the first included angle is 10-15 degrees, and the second included angle is 30-60 degrees.
Further, in S200, inert shielding gas is fed through a shielding gas cover and then is subjected to gas feeding protection, gas is fed before welding, gas is stopped after welding, wherein the inert shielding gas is high-purity argon with the purity of 99.99-99.999%, and the flow of the shielding gas is 15-30L/min.
Further, in S200, the flux-cored wire performs the proportioning of the alloy system according to the grain size, service conditions and mechanical properties of the welded joint, wherein the flux-cored wire is formed by combining a TA1 titanium alloy metal sheath and a powder core of the required alloy system.
Further, in S200, the laser oscillation mode is preferably a spatial spiral laser oscillation mode, the oscillation frequency of the spatial spiral laser oscillation mode is 100Hz to 300Hz, the oscillation amplitude is 1mm to 3mm, and the helix angle is 20 ° to 60 °.
Furthermore, in S200, the laser power is 3000W-6000W, the defocusing amount is-10 mm- +20mm, and the welding speed is 0.3 m/min-0.8 m/min.
Further, in S300, the weld bead cleaning is performed by mechanical cleaning or laser cleaning, and is used to remove the oxide between the weld layers.
The following is a specific embodiment of the present invention:
in the embodiment, a TC4 titanium alloy test plate with the thickness of 20mm is selected and used for processing a Y-shaped groove, and the groove is in a form shown in FIG. 1. The chemical compositions of the parent metal and the flux-cored deposited metal are shown in table 1.
TABLE 1 chemical composition of parent metal and flux cored deposited metal
The flux-cored wire comprises the following chemical components in percentage by weight: 0.19% of C, 0.18% of O, 0.02% of N, 0.03% of H, 0.015% of Fe, 5.92% of Al, 5.78% of V, 0.5% of Mo and the balance of Ti. Specifically, the test plate to be welded is polished in 3% HF and 35% HNO3Soaking the mixed solution for 15-20 min, and then washing and drying the mixed solution by using clear water to remove oil stains and oxides on the surface. Clamping the test plate by using a clamp, introducing argon with the purity of 99.999 percent into a welding shielding gas device before welding, wherein the flow of the shielding gas is 20L/min; adjusting the included angle between the laser and the test board to be 10 degrees; the included angle between the welding wire and the plate is 45 degrees, the laser power is set to be 4kW, the defocusing amount is +15mm, and the welding speed is set by the welding processThe degree is 0.5m/min, the swing frequency is 150Hz, the swing amplitude is 2mm, and the helix angle is 30 degrees. The macroscopic topography of the front, back and cross section of the weld joint is shown in fig. 3. As can be seen from FIG. 3, the weld surface was uniform and dense without any weld defects. The microstructure of the welded joint is shown in fig. 4. As can be seen from fig. 4, the grains of the welded joint are significantly refined. The mechanical properties of the welded joints were measured as shown in table 2,
TABLE 2 weld joint mechanical property test results
As can be seen from table 2, the weld joint impact performance was improved by about 50% compared to the base material. Therefore, the effective combination of the welding method can be proved to be capable of obviously thinning the grain size of the titanium alloy welding joint, and the method is feasible.
In summary, the invention provides a thick-wall narrow-gap welding method for refining TC4 titanium alloy weld joint structure grains, and the method combines a spatial spiral swinging laser beam and a multi-alloy system titanium alloy flux-cored wire and is applied to the welding of titanium alloy narrow gaps. Compared with a solid welding wire, the titanium alloy flux-cored wire has the advantages of flexible component adjustment, low development cost and the like, but the flux-cored wire has high welding pool viscosity and poor spreadability in the welding process, and welding defects such as poor side wall fusion, air holes and the like are easily generated in the narrow-gap welding process of the large-thickness titanium alloy. When welding methods such as conventional arc welding (TIG welding, MIG welding), and swing laser welding (circular, vertical, infinity, 8, and other swing methods) are used for welding the titanium alloy flux-cored wire, it is difficult to stir molten pool liquid metal in a three-dimensional space in a real-time, uniform, and periodic manner. According to the invention, on the basis of the multi-alloy system flux-cored wire, the three-dimensional space fluidity of the molten pool is increased by introducing the spatial spiral swinging laser heat source, so that the alloy elements for refining the grains can be uniformly distributed in the welding joint, the effect of refining the grains of the structure of the welding joint is achieved, the porosity of the welding seam is obviously reduced, and the defect of poor fusion of the side wall is inhibited. Through the measures, the crystal grains of the TC4 titanium alloy narrow-gap welding joint are obviously refined on the premise of ensuring the welding quality, and the impact toughness of the welding joint is greatly improved. Provides a new method for refining the narrow gap welding of TC4 titanium alloy weld grains and improving the impact toughness of a welding joint.
Claims (10)
1. The thick-wall narrow gap welding method for refining TC4 titanium alloy weld structure grains is characterized by comprising the following steps of:
s100, performing groove machining on the thick-wall titanium alloy plate to be welded, performing pretreatment after the machining is finished, and then clamping;
s200, under the protection of inert shielding gas, performing laser flux-cored wire welding in a laser beam space spiral swinging mode;
and S300, cleaning the welding bead after the single-layer welding is finished, and then repeating the single-layer and single-pass welding until the welding bead is filled, thereby finishing the welding.
2. The thick-wall narrow-gap welding method for refining the TC4 titanium alloy grains is characterized in that in S100, the thickness of the to-be-welded thick-wall titanium alloy plate is 20-80 mm.
3. The thick-wall narrow-gap welding method for refining TC4 titanium alloy grains according to claim 1, wherein in S100, the specific parameters of the groove machining are as follows: the groove is Y-shaped or X-shaped, the truncated edge of the groove is 4-6 mm, and the angle of the single groove is 1-3 degrees.
4. The thick-wall narrow-gap welding method for refining TC4 titanium alloy grains according to claim 1, wherein in S100, the pretreatment comprises grinding and pickling, and the pickling comprises the following specific processes: in HF and HNO3Soaking the mixed solution for 15-20 min, then washing and drying the mixed solution by using clear water, wherein the HF and the HNO3The volume fraction of HF in the mixed solution is 2-4%, and HNO3The volume fraction of (A) is 30-40%, and the rest is H2O。
5. The thick-walled narrow gap welding method for refining TC4 titanium alloy grain weld structure grains according to claim 1, wherein in S200, the parameters of the laser flux cored wire welding are set as follows: the filling metal is a titanium alloy flux-cored wire, a laser beam and a plate normal line form a first included angle, the welding wire and the plate form a second included angle, an incident point of the laser beam and the end portion of the welding wire are arranged at intervals, the first included angle is 10-15 degrees, and the second included angle is 30-60 degrees.
6. The method for thick-wall narrow-gap welding of refined TC4 titanium alloy grain weld structure grains as claimed in claim 5, wherein in S200, the inert shielding gas is post-gas-fed through a shielding gas hood, gas is fed before welding, gas is delayed and stopped after welding, wherein the inert shielding gas is high-purity argon gas with the purity of 99.99-99.999%, and the shielding gas flow is 15-30L/min.
7. The method of claim 5, wherein in S200, the flux-cored wire is prepared by proportioning an alloy system according to the requirements of the grain size, service conditions and mechanical properties of a welding joint, wherein the flux-cored wire is formed by combining a TA1 titanium alloy metal sheath and a metal powder core of a required alloy system.
8. The method for thick-wall narrow-gap welding with refined TC4 Ti alloy weld seam structure grains according to claim 5, wherein in S200, the laser oscillation mode is a space spiral laser oscillation mode, the oscillation frequency of the space spiral laser oscillation mode is 100 Hz-300 Hz, the oscillation amplitude is 1 mm-3 mm, and the helix angle is 20-30 °.
9. The thick-wall narrow-gap welding method for refining the TC4 titanium alloy weld structure grains as claimed in claim 5, wherein in S200, the laser power is 3000W-6000W, the defocusing amount is-10 mm- +20mm, and the welding speed is 0.3 m/min-0.8 m/min.
10. The thick-walled narrow gap welding method for refining the TC4 titanium alloy weld structure grains according to claim 1, wherein in S300, the cleaning welding bead is a mechanical cleaning mode or a laser cleaning mode and is used for removing oxides between weld layers.
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| CN115846867A (en) * | 2022-10-28 | 2023-03-28 | 哈尔滨焊接研究院有限公司 | High-ductility, high-toughness and high-strength welding joint based on Ti-6Al-4V titanium alloy and tissue regulation method and application thereof |
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| CN115821186B (en) * | 2022-12-19 | 2023-08-08 | 中国机械总院集团哈尔滨焊接研究所有限公司 | Heat treatment method for improving toughness of titanium alloy welded joint |
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