Nickel-based alloy laser cladding and GTAW double transition layer material and method

Abstract

The invention discloses a nickel-based alloy laser cladding and GTAW double-transition-layer material. The nickel-based alloy laser cladding and GTAW double-transition-layer material comprises a laser cladding material and a GTAW welding material. The laser cladding material comprises the following components in percentage by mass: 20.0%-30.0% of Fe powder, 15.0%-20.0% of Cr powder, 5.0%-10.0% of Co powder, 5.0%-10.0% of W powder, 0.5%-1.0% of Al powder, 0.5%-1.0% of Ti powder and the balance of Ni powder. The GTAW welding material comprises powder and a welding skin, and the powder comprises, by mass, 50.0%-60.0% of Co powder, 10.0%-20.0% of W powder, 2.0%-4.0% of Al powder, 2.0%-4.0% of Ti powder and the balance Ni powder. The material is used for solving the problem that the joint performance of an aging-state nickel-based high-temperature alloy joint under a single process is lower than that of a base material. The invention further discloses a nickel-based alloy welding method using the double-transition-layer material.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metal materials, and particularly relates to a nickel-based alloy laser cladding+GTAW double transition layer material and a nickel-based alloy welding method using the double transition layer material. BACKGROUND

[0002] Nickel-based high-temperature alloys play an important role in the manufacture of key components in the fields of aerospace, energy and chemical industry, etc. After aging strengthening, the forged state has excellent high-temperature strength, creep resistance and corrosion resistance. However, the alloy often needs to be welded during manufacturing or repairing, especially for the iron-nickel-based high-temperature alloy in the aged strengthening state. The welding process easily causes performance degradation in the heat-affected zone, which constitutes a process difficulty.

[0003] At present, as a commonly used welding method, GTAW has a high heat input, which leads to the "overaging" or dissolution and coarsening of precipitated phases in the heat-affected zone under the action of welding thermal cycle, thereby weakening the strengthening effect of the strengthening phases such as γ' and γ''. As a result, a softened zone is formed. The strength and hardness of the zone are significantly lower than those of the base material and the weld, which becomes a weak link of the welded joint and seriously affects the reliability and service performance of the component under high temperature and high pressure working conditions.

[0004] To alleviate the above-mentioned softening phenomenon, the conventional methods include controlling the welding heat input and optimizing the post-weld heat treatment. However, the former is limited by the process feasibility and is easy to cause defects such as incomplete fusion, and the latter has the challenges of narrow process window and difficulty in accurately controlling the organization and performance. Laser cladding, as a high-energy beam processing technology, can significantly inhibit the width and softening degree of the heat-affected zone due to its high energy density, low heat input and rapid cooling characteristics. However, as a direct connection method, the laser cladding has limited penetration capability for thick-walled components, and the component matching and synergistic performance control between the cladding material and the subsequent welding material are still technical bottlenecks.

[0005] Therefore, it is urgent to develop a new type of composite welding process to solve the problem that the joint performance of the aged nickel-based high-temperature alloy joint under the single GTAW process is lower than that of the base material. SUMMARY

[0006] The first object of the present application is to provide a nickel-based alloy laser cladding+GTAW double transition layer material, which comprises a laser cladding material and a GTAW welding material, to solve the problem that the joint performance of the aged nickel-based high-temperature alloy joint under the single GTAW process is lower than that of the base material.

[0007] The second object of the present application is to provide a nickel-based alloy welding method using the double transition layer material, which solves the problem that the joint performance of the aged nickel-based high-temperature alloy joint under the single GTAW process is lower than that of the base material.

[0008] The first technical solution adopted by the present application is a nickel-based alloy laser cladding + GTAW double transition layer material, which comprises laser cladding material and GTAW welding material. The laser cladding material comprises the following components in terms of mass percentage: Fe powder 20.0-30.0%, Cr powder 15.0-20.0%, Co powder 5.0-10.0%, W powder 5.0-10.0%, Al powder 0.5-1.0%, Ti powder 0.5-1.0%, and the rest is Ni powder, and the sum of the mass percentages of the above components is 100%. The GTAW welding material comprises powder and welding skin, wherein the powder comprises the following components in terms of mass percentage: Co powder 50.0-60.0%, W powder 10.0-20.0%, Al powder 2.0-4.0%, Ti powder 2.0-4.0%, and the rest is Ni powder, and the sum of the mass percentages of the above components is 100%.

[0009] The purity of each raw material component alloy powder of the laser cladding material is ≥99.9%.

[0010] The purity of each raw material component alloy powder of the GTAW welding material is ≥99.1%.

[0011] The present application is further characterized in that: The particle size of each powder of the GTAW welding material is 100-200 mesh.

[0012] The welding skin of the GTAW welding material is Inconel 625 tape, with a thickness of 0.4 mm and a width of 7 mm.

[0013] The filling rate of the GTAW welding material is controlled at 30-32 wt%.

[0014] The preparation method of the laser cladding material comprises the following specific steps: Step 1: Fe powder 20.0-30.0%, Cr powder 15.0-20.0%, Co powder 5.0-10.0%, W powder 5.0-10.0%, Al powder 0.5-1.0%, Ti powder 0.5-1.0%, and the rest is Ni powder, in terms of mass percentage; Step 2: After mixing the alloy powders of step 1, vacuum smelting is carried out, and gas atomization method is used for powder preparation; Step 3: The atomized alloy powder is sieved to a certain particle size range; Step 4: The prepared powder is vacuum packaged and ready for use.

[0015] In the preparation method of the laser cladding material: In step 2, a vacuum melting device is used, N2 is used as atomizing gas, the atomizing pressure is 6MPa~8MPa, and the overheat of the melt is kept at 100℃~150℃ during the atomizing process; In step 3, the particle size of the screened alloy powder is 25μm~53μm, namely 270~500 meshes. The flowability of the screened alloy powder is required to be 25s / 100g~40s / 100g.

[0016] The preparation method of the GTAW welding material is as follows: Step 1: Co powder 50.0~60.0%, W powder 10.0~20.0%, Al powder 2.0~4.0%, Ti powder 2.0~4.0%, and the rest is Ni powder are weighed according to the mass percentage, and the sum of the mass percentages of the above components is 100%; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at a temperature of 200℃~260℃ for 1h~2h to remove the crystal water in the powder; the dried powder is placed in a powder mixer for thorough mixing for 1h~2h; Step 3: Inconel 625 tape is used, alcohol is used to remove the grease on the surface of the Inconel 625 tape, the powder prepared in step 2 is wrapped in the Inconel 625 tape through a core wire drawing device, and the first drawing die has a hole diameter of 2.6mm; In step 3, the filling rate of the flux-cored wire is controlled at 30wt%~32wt%; Step 4: After the first process of drawing is completed, the die hole diameter is gradually reduced, and finally the flux-cored wire with a diameter of 1.2mm is obtained; Step 5: After the drawing of the flux-cored wire is completed, the wire is wound on a wire spool by a winding machine, and finally sealed in a vacuum packaging bag for use.

[0017] The second technical solution adopted by the present application is a nickel-based alloy welding method using double transition layer materials, which uses the above-mentioned nickel-based alloy laser cladding + GTAW double transition layer materials for welding, and the specific steps are as follows: Step 1, the two nickel-based alloy plates to be welded are opened on one side for welding with a bevel; Step 2, laser cladding layer preparation is carried out on the opened bevel surface, and the above-mentioned laser cladding material is selected; Step 3, the above-mentioned GTAW welding material is selected, and a hot wire GTAW automatic welding process is used to prepare a cladding layer on the surface of the laser cladding layer obtained in step 2; Step 4, the two nickel-based alloy plates with double transition layers obtained in step 3 are butt welded, and the welding material is ERNiCrCoMo-1.

[0018] The application is also characterized in that: In step 1, a V-shaped groove is formed between the two nickel-based alloy plates to be welded, with a single-side angle of 10°-15°; In step 2, when laser cladding is performed, the laser power is 1kW-3kW, and the cladding layer thickness is 1.0mm-1.5mm; In step 3, the welding current is 130A-200A, the surfacing layer thickness is 2.0mm-4.0mm, and the interlayer temperature is controlled at 20℃-50℃; In step 4, the welding method is hot wire GTAW automatic welding process, the welding current is 130A-200A, and the interlayer temperature is controlled at 20℃-50℃.

[0019] The application has the following beneficial effects: (1) The laser cladding layer material and the GTAW layer material designed in the application are combined by solid solution strengthening and precipitation strengthening, thereby realizing excellent strength and toughness matching of the joint.

[0020] (2) The welding material developed in the application can be used for non-gas shielded arc welding and gas shielded arc welding, and has wide application prospects.

[0021] (3) The method of the application first prepares a layer of transition material with matched composition and performance on the surface of the aged base material by laser cladding, so as to greatly isolate the influence of the subsequent GTAW heat process on the base material; then GTAW welding is performed on the basis, and special welding material matched therewith is used to form a second layer of transition structure. Through the collaborative design and preparation of the double transition layers, the softening of the heat affected zone can be effectively inhibited, the performance of each region of the welded joint can be balanced, and a reliable path for high-quality connection of the aged nickel-based high-temperature alloy is provided.

[0022] (4) The method of the application aims at the performance mismatch problem of the GTAW welded joint of the aged nickel-based alloy, and develops the preparation of laser cladding+GTAW double transition layer, so as to finally realize the matching of the performance of the welded joint and the base material.

[0023] (5) The method of the application adopts the method of preparing the laser cladding layer first and then preparing the GTAW surfacing layer, which takes advantage of the low heat input characteristics of laser cladding, so that the softening effect on the base material when the GTAW surfacing layer is prepared subsequently is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a flowchart of the nickel-based alloy welding method using double transition layer material of the application; Figure 2 It is the metallographic structure of the laser cladding layer prepared by example 2; Figure 3 Metallographic structure of GTAW surfacing layer prepared using example 2; Figure 4 Tensile fracture morphology of nickel-based alloy butt joint prepared using example 2. DETAILED DESCRIPTION

[0025] The application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The application provides a nickel-based alloy laser cladding + GTAW double transition layer material, which comprises laser cladding material and GTAW welding material. The laser cladding material comprises the following components in percentage by mass: Fe powder 20.0-30.0%, Cr powder 15.0-20.0%, Co powder 5.0-10.0%, W powder 5.0-10.0%, Al powder 0.5-1.0%, Ti powder 0.5-1.0%, and the rest is Ni powder, and the sum of the mass percentages of the above components is 100%. The GTAW welding material comprises powder and a welding skin, wherein the powder comprises the following components in percentage by mass: Co powder 50.0-60.0%, W powder 10.0-20.0%, Al powder 2.0-4.0%, Ti powder 2.0-4.0%, and the rest is Ni powder, and the sum of the mass percentages of the above components is 100%.

[0027] The purity of each raw material component alloy powder of the laser cladding material is ≥99.9%.

[0028] The purity of each raw material component alloy powder of the GTAW welding material is ≥99.1%.

[0029] The particle size of each powder of the GTAW welding material is 100-200 mesh.

[0030] The welding skin of the GTAW welding material is an Inconel 625 strip with a thickness of 0.4 mm and a width of 7 mm.

[0031] The filling rate of the GTAW welding material is controlled at 30-32 wt%.

[0032] The functions and functions of the main components in the nickel-based alloy laser cladding + GTAW double transition layer material are as follows: The main elements of the laser cladding material are: Ni, Fe, Cr, Co, W, Al, Ti The main alloying elements of the GTAW welding material are: Ni, Co, Cr, W, Mo, Nb, Al, Ti.

[0033] (1) Ni element: the laser cladding material and the GTAW material are mainly composed of Ni element, which is because the main alloying element of the nickel-based alloy to be welded is Ni, so the transition layer welding material is mainly composed of Ni, which belongs to the composition matching with the base material.

[0034] (2) Co element: the laser cladding material and the GTAW material both add Co element. The double transition layers designed in the application are both in the mode of solid solution strengthening + precipitation strengthening. Co element belongs to solid solution strengthening element, and Co element solid solution in the γ-Ni matrix can significantly improve the strength of the nickel-based alloy. The addition of Co element can also significantly improve the high-temperature mechanical properties of the weld, thereby making up for the performance deficiency of the weld due to element segregation in the non-equilibrium solidification process.

[0035] (3) Cr element: the laser cladding material and the GTAW material both add Cr element. The double transition layers designed in the application are both in the mode of solid solution strengthening + precipitation strengthening. Cr element belongs to solid solution strengthening element, and the introduction of Cr element is mainly based on double considerations: firstly, Cr element solid solution in the γ-Ni matrix can realize significant solid solution strengthening through lattice distortion effect, thereby effectively improving the strength of the transition layer and matching the performance of the base material; secondly, Cr can generate a layer of dense and well-adhered chromium oxide (Cr2O3) protective film on the surface in high temperature environment, thereby fundamentally enhancing the high-temperature oxidation resistance of the surfacing alloy.

[0036] (4) W element: the laser cladding material and the GTAW material both add W element. The double transition layers designed in the application are both in the mode of solid solution strengthening + precipitation strengthening. W element belongs to solid solution strengthening element, and the large atomic of W element dissolved in the nickel matrix causes lattice distortion, effectively hinders dislocation movement. At the same time, as a slow diffusion element, W can inhibit the degradation of microstructure at high temperature, thereby stabilizing the strengthening phase and ensuring the durability of the performance. However, the addition of W also needs to be accurately controlled, because it will increase the density of the alloy and may worsen the processability, and in excess, it may even promote the precipitation of harmful brittle phase.

[0037] (5) Al and Ti elements: In the GTAW welding of nickel-based alloys, the introduction of aluminum (Al) and titanium (Ti) into the weld metal is the key means to realize the precipitation strengthening effect. During the post-weld cooling or heat treatment stage, Al and Ti elements interact with the nickel matrix, promoting the fine distribution of γ' phase (Ni3(Al, Ti)) from the matrix. This coherent ordered precipitated phase can effectively inhibit dislocation slip, thereby significantly enhancing the mechanical properties of the weld metal, especially its strength and creep resistance at high temperatures. This strengthening mechanism is of key significance to the performance matching between the weld and the age-hardened base material, which can avoid joint failure due to strength difference. Further, by reasonably adjusting the ratio of Al and Ti, the lattice mismatch between γ' phase and matrix can be adjusted, thereby maintaining the long-term stability of the organizational structure while ensuring high strength, and ensuring the safe and long-term service of the welded components in high temperature environment. In the present invention, the Al and Ti contents in the laser cladding layer are lower than those in the GTAW cladding layer, because laser cladding itself has the characteristics of fast cooling, and the grains in the cladding layer are smaller than those in the GTAW cladding layer, and the performance is better than that of the GTAW cladding layer with the same composition.

[0038] (6) Fe element: Fe element is added to the laser cladding layer. The laser cladding layer is in direct contact with the nickel-based base material. In the transition layer design, iron (Fe) element is introduced, mainly based on its two key contributions: on the one hand, Fe atoms enter the γ-Ni matrix by solid solution, causing lattice distortion and producing obvious solid solution strengthening effect, directly enhancing the strength of the transition layer material; on the other hand, considering that the nickel-based base material usually contains a certain amount of Fe, the intentional addition of this element in the transition layer helps to improve its compatibility with the base material in the alloy system, thereby promoting the weld interface to achieve good metallurgical bonding, effectively ensuring the connection quality and service reliability of the joint.

[0039] (7) Mo element: In order to ensure the performance matching of the butt joint, sufficient solid solution strengthening elements must be introduced into the weld or transition layer, as the nickel-based base material is usually subjected to aging treatment to have high strength. As an ideal additive element, molybdenum (Mo) can significantly strengthen the nickel-based solid solution, effectively improve the material strength while maintaining good plasticity and toughness matching.

[0040] (8) Nb element: In the alloy design of nickel-based alloy, the addition of niobium (Nb) is one of the key links to realize the high performance of the material. Its function mainly shows the synergistic effect of triple strengthening mechanism: as a solid solution element, Nb atoms melt into the nickel matrix to cause lattice strain, contributing to the basic strength; as a key precipitate phase forming element, Nb dominates the precipitation of metastable γ" phase (Ni3Nb), which maintains a coherent relationship with the matrix and can produce strong coherent strain strengthening, significantly improving the yield strength of the alloy; in addition, Nb has a strong tendency to form carbides, which can generate thermodynamically stable NbC carbides. These carbides are often precipitated at grain boundaries or within grains, not only refining the grain structure, but also effectively pinning the grain boundary migration, thereby optimizing the creep properties and long-term organizational stability of the alloy. Through the organic combination of the above solid solution, precipitation and carbide strengthening paths, the addition of Nb comprehensively enhances the mechanical properties and high temperature service ability of nickel-based alloy.

[0041] The preparation method of the laser cladding material is as follows: Step 1: respectively take Fe powder 20.0-30.0%, Cr powder 15.0-20.0%, Co powder 5.0-10.0%, W powder 5.0-10.0%, Al powder 0.5-1.0%, Ti powder 0.5-1.0%, and the rest is Ni powder, the sum of the mass percentage of the above components is 100%; Step 2: vacuum smelting after mixing the alloy powders of step 1, and adopting gas atomization method for powdering; In step 2, a vacuum smelting equipment is used, N2 is used as atomizing gas, the atomizing pressure is 6MPa-8MPa, and the superheat degree of the melt is kept at 100℃-150℃ during the atomizing process; Step 3: screen the atomized alloy powder to make the screened alloy powder within a certain particle size range; In step 3, the particle size range of the screened alloy powder is 25μm-53μm, i.e. 270-500 mesh; The flowability of the screened alloy powder is required to be 25s / 100g-40s / 100g.

[0042] Step 4: vacuum package the prepared powder for later use.

[0043] The preparation method of the GTAW welding material is as follows: Step 1: respectively take Co powder 50.0-60.0%, W powder 10.0-20.0%, Al powder 2.0-4.0%, Ti powder 2.0-4.0%, and the rest is Ni powder, the sum of the mass percentage of the above components is 100%; Step 2: Place the weighed powder from Step 1 into a vacuum heating furnace and heat it at a temperature of 200℃~260℃ for 1h~2h to remove the water of crystallization from the powder; place the dried powder into a powder mixer for thorough mixing for 1h~2h. Step 3: Using Inconel 625 strip, remove the grease from the surface of the Inconel 625 strip with alcohol, and wrap the flux powder prepared in step 2 inside the Inconel 625 strip using a flux-cored wire drawing device. The diameter of the first drawing die is 2.6mm. In step 3, the filling rate of the flux-cored welding wire is controlled at 30wt%~32wt%; Step 4: After the first drawing process is completed, the die hole diameter is reduced one by one to finally obtain a flux-cored wire with a diameter of 1.2mm; Step 5: After the flux-cored welding wire is drawn, it is wound onto the welding wire spool by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for later use.

[0044] This invention also provides a method for welding nickel-based alloys using a double transition layer material, employing the aforementioned nickel-based alloy laser cladding + GTAW double transition layer material for welding. The specific steps are as follows (e.g.) Figure 1 (as shown) Step 1: Make welding bevels on opposite sides of the two nickel-based alloy plates to be welded; In step 1, a V-shaped bevel is formed between the two nickel-based alloy plates to be welded, with an angle of 10°~15° on one side; Step 2: Prepare a laser cladding layer on the beveled surface, selecting the laser cladding material mentioned above; In step 2, when performing laser cladding, the laser power is 1kW~3kW and the cladding layer thickness is 1.0mm~1.5mm; Step 3: Select the above-mentioned GTAW welding material and use the hot wire GTAW automatic welding process to prepare the weld overlay layer on the surface of the laser cladding layer obtained in Step 2; In step 3, the welding current is 130A~200A, the thickness of the weld overlay is 2.0mm~4.0mm, and the interpass temperature is controlled at 20℃~50℃; Step 4: Butt weld the two nickel-based alloy plates with double transition layers obtained in Step 3. The welding material is ERNiCrCoMo-1.

[0045] In step 4, the welding method is hot wire GTAW automatic welding process, the welding current is 130A~200A, and the interpass temperature is controlled at 20℃~50℃.

[0046] Example 1 The specific steps for preparing laser cladding materials are as follows: Step 1: Fe powder 20.0%, Cr powder 15.0%, Co powder 5.0%, W powder 5.0%, Al powder 0.5%, Ti powder 0.5%, and the rest is Ni powder, respectively, according to the mass percentage, and the sum of the mass percentages of the above components is 100%; Step 2: After mixing the alloy powders of each raw material in step 1, vacuum melting is carried out, and gas atomization method is used for powdering; Step 3: The atomized alloy powder is sieved to have the sieved alloy powder in a certain particle size range.

[0047] Step 4: The prepared powder is vacuum packaged and ready for use.

[0048] In step 2, a vacuum melting device is used, N2 is used as the atomizing gas, the atomizing pressure is 6 MPa, and the superheat of the melt is kept at 100℃ during the atomizing process.

[0049] In step 3, the particle size of the sieved alloy powder is 253 μm.

[0050] The flowability of the sieved alloy powder is required to be 25 s / 100 g.

[0051] The purity of each raw material component alloy powder of the laser cladding material is ≥99.9%.

[0052] The preparation method of the GTAW welding material is as follows: Step 1: Co powder 50.0%, W powder 10.0%, Al powder 2.0%, Ti powder 2.0%, and the rest is Ni powder, respectively, according to the mass percentage, and the sum of the mass percentages of the above components is 100%; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated, the heating temperature is 200℃, and the holding time is 1h to remove the crystal water in the powder. The dried powder is placed in a powder mixer for thorough mixing, and the mixing time is 1h; Step 3: Inconel 625 tape is used as the welding skin, alcohol is used to remove the grease on the surface of the Inconel 625 tape, the powder prepared in step 2 is wrapped in the Inconel 625 tape through the core wire drawing equipment, and the first drawing die hole diameter is 2.6mm; In step 3, the thickness of the Inconel 625 tape is 0.4mm, and the width is 7mm; the filling rate of the flux-cored wire is controlled at 30wt%.

[0053] Step 4: After the first process of drawing is completed, the die hole diameter is gradually reduced, and finally the flux-cored wire with a diameter of 1.2mm is obtained.

[0054] Step 5: After the core wire drawing is completed, the core wire is wound on the wire spool by the wire winding machine, and finally sealed in the core wire vacuum packaging bag for use.

[0055] The purity of each raw material component alloy powder of the GTAW welding material is ≥ 99.1%.

[0056] The particle size of each powder of the GTAW welding material is 100 mesh.

[0057] The laser cladding + GTAW welding material prepared by the case 1 is used to prepare a nickel-based alloy double transition layer, and a nickel-based alloy welding method using the double transition layer material is used. The specific steps are as follows (as shown in Figure 1 ). Step 1: The two nickel-based alloy plates to be welded are opened on one side for welding with a bevel, and a V-shaped groove is formed between the two nickel-based alloy plates, with a single side angle of 10°. Step 2: Laser cladding layer preparation is performed on the surface of the opened groove, and the laser cladding material prepared in this embodiment is selected, the laser power is 1 kW, and the cladding layer thickness is 1.0 mm. Step 3: The GTAW welding material prepared in this embodiment is selected, and a build-up layer is prepared on the surface of the laser cladding layer obtained in step 2 by using hot wire GTAW automatic welding process, the welding current is 130 A, the build-up layer thickness is 2.0 mm, and the interlayer temperature is controlled at 20℃.

[0058] Step 4: The two nickel-based alloy plates with double transition layers obtained in step 3 are butt welded, the welding material is ERNiCrCoMo-1, the welding method is hot wire GTAW automatic welding process, the welding current is 130 A, and the interlayer temperature is controlled at 20℃.

[0059] The above joint is subjected to non-destructive testing, microstructure observation and mechanical property testing, and the results are as follows: (1) According to the NB / T 47013.2 “Non-destructive testing of pressure equipment Part 2: Radiographic testing” specification, the above heat-treated welded test plate is subjected to radiographic testing, and the results show that the radiographic testing technical grade is AB grade, and the quality grade is I grade qualified.

[0060] (2) The above welded joint is subjected to tensile test according to NB / T 47014-2023 “Welding procedure qualification of pressure equipment”. The results show that the tensile strength of the joint is 1006 MPa, and the tensile strength of the aged parent material is 1010 MPa, which indicates that the joint realizes excellent strength matching with the parent material.

[0061] Example 2 The preparation method of the laser cladding material is as follows: Step 1: Fe powder 30.0%, Cr powder 20.0%, Co powder 10.0%, W powder 10.0%, Al powder 1.0%, Ti powder 1.0%, and the rest is Ni powder, respectively, according to the mass percentage, and the sum of the mass percentages of the above components is 100%; Step 2: After mixing the alloy powders of step 1, vacuum melting is carried out, and gas atomization method is used for powdering; Step 3: The atomized alloy powder is sieved to have the sieved alloy powder in a certain particle size range. Step 4: The prepared powder is vacuum packaged and ready for use.

[0062] In step 2, a vacuum melting device is used, N2 is used as the atomizing gas, the atomizing pressure is 8 MPa, and the superheat of the melt is kept at 150℃ during the atomizing process.

[0063] In step 3, the particle size of the sieved alloy powder is 53 μm.

[0064] The flowability of the sieved alloy powder is required to be 40 s / 100g.

[0065] The purity of each raw material component alloy powder of the laser cladding material is ≥99.9%.

[0066] The preparation method of the GTAW welding material is as follows: Step 1: Co powder 60.0%, W powder 20.0%, Al powder 4.0%, Ti powder 4.0%, and the rest is Ni powder, respectively, according to the mass percentage, and the sum of the mass percentages of the above components is 100%; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated, the heating temperature is 260℃, and the holding time is 2h, to remove the crystal water in the powder; the dried powder is placed in a powder mixer for thorough mixing, and the mixing time is 2h; Step 3: Inconel 625 tape is used as the welding skin, alcohol is used to remove the grease on the surface of the Inconel 625 tape, the powder prepared in step 2 is wrapped in the Inconel 625 tape through the core wire drawing equipment, and the first drawing die hole diameter is 2.6mm; In step 3, the thickness of the Inconel 625 tape is 0.4mm, and the width is 7mm; the filling rate of the flux-cored wire is controlled at 32wt%.

[0067] Step 4: After the first process of drawing is completed, the die hole diameter is gradually reduced, and finally the flux-cored wire with a diameter of 1.2mm is obtained.

[0068] Step 5: After the drawing of the flux-cored wire is completed, it is wound on the welding wire disc through the winding machine, and finally sealed in the vacuum packaging bag of the flux-cored wire for use.

[0069] The purity of each raw material component of the GTAW welding material alloy powder is ≥ 99.1%.

[0070] The particle size of each powder of the GTAW welding material is 200 mesh.

[0071] The nickel-based alloy double-transition layer prepared by the laser cladding + GTAW welding material prepared in the implementation case 2 is used, and the nickel-based alloy welding method of the double-transition layer material is used. The specific steps are as follows (as shown in Figure 1 Step 1, the two sides of the nickel-based alloy plates to be welded are opened for welding with a groove, and a V-shaped groove is formed between the two nickel-based alloy plates to be welded, and the single-side angle is 15°; Step 2, laser cladding layer preparation is carried out on the surface of the opened groove, and the laser cladding material prepared in this embodiment is selected, the laser power is 3kW, and the cladding layer thickness is 1.5mm; Step 3, the GTAW welding material prepared in this embodiment is selected, and the hot wire GTAW automatic welding process is used to prepare the cladding layer on the surface of the laser cladding layer obtained in step 2, the welding current is 200A, the cladding layer thickness is 4.0mm, and the interlayer temperature is controlled at 50℃.

[0072] Step 4, butt welding is carried out on the two nickel-based alloy plates with double-transition layers obtained in step 3, the welding material is ERNiCrCoMo-1, the welding method is hot wire GTAW automatic welding process, the welding current is 200A, and the interlayer temperature is controlled at 50℃.

[0073] The above joint is subjected to non-destructive testing, microstructure observation and mechanical property testing, and the results are as follows: (1) According to the NB / T 47013.2 “Non-destructive testing of pressure equipment Part 2: Radiographic testing” specification, the above heat-treated welded test plate is subjected to radiographic testing, and the results show that the radiographic testing technical grade is AB grade, and the quality grade is I grade qualified.

[0074] (2) The above welding joint is subjected to tensile test according to NB / T 47014-2023 “Welding procedure qualification of pressure equipment”. The results show that the tensile strength of the joint is 1008MPa, and the tensile strength of the aged parent material is 1010MPa, which indicates that the joint realizes excellent strength matching with the parent material.

[0075] Figure 2 The metallographic structure of the laser cladding layer prepared by using the implementation example 2 is shown in the figure. As can be seen from the figure, the laser cladding layer is mainly composed of fine γ-Ni structure. No pores and cracks and other defects are found in the cladding layer.

[0076] Figure 3 ​Metallographic structure of the GTAW surfacing layer prepared using Example 2. As can be seen from the figure, the GTAW surfacing layer is mainly composed of γ-Ni and presents a columnar dendritic crystal morphology. No defects such as pores and cracks are found in the surfacing layer.

[0077] Figure 4 Tensile fracture morphology of the nickel-based alloy butt joint prepared using Example 2. As can be seen from the figure, the tensile fracture is mainly in the form of dimples.

[0078] Example 3 The preparation method of the laser cladding material is as follows: Step 1: Fe powder 25.0%, Cr powder 17.0%, Co powder 7.0%, W powder 7.0%, Al powder 0.7%, Ti powder 0.7%, and the rest is Ni powder, with the sum of the mass percentages of the above components being 100%; Step 2: After mixing the alloy powders of step 1, vacuum melting is performed, and gas atomization method is used for powdering; Step 3: The atomized alloy powder is sieved to have the sieved alloy powder within a certain particle size range. Step 4: The prepared powder is vacuum packaged for later use.

[0079] In step 2, a vacuum melting device is used, N2 is used as the atomizing gas, the atomizing pressure is 7 MPa, and the superheat degree of the melt during the atomizing process is kept at 130℃.

[0080] In step 3, the particle size of the sieved alloy powder is 35μm.

[0081] The flowability of the sieved alloy powder is required to be 30s / 100g.

[0082] The purity of each raw material component alloy powder of the laser cladding material is ≥99.9%.

[0083] The preparation method of the GTAW welding material is as follows: Step 1: Co powder 55.0%, W powder 15.0%, Al powder 3.0%, Ti powder 3.0%, and the rest is Ni powder, with the sum of the mass percentages of the above components being 100%; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated, the heating temperature is 230℃, the holding time is 1.5h, and the crystal water in the powder is removed; the dried powder is placed in a powder mixer for thorough mixing, and the mixing time is 1.5h; Step 3: Inconel 625 tape is used as a welding skin, alcohol is used to remove grease on the surface of the Inconel 625 tape, the drug powder prepared in step 2 is wrapped in the Inconel 625 tape through the core wire drawing equipment, and the first drawing die hole diameter is 2.6 mm; In step 3, the thickness of the Inconel 625 tape is 0.4 mm, and the width is 7 mm; the filling rate of the flux-cored wire is controlled at 30wt%.

[0084] Step 4: After the first process of drawing is completed, the die hole diameter is gradually reduced, and finally the flux-cored wire with a diameter of 1.2 mm is obtained.

[0085] Step 5: After the drawing of the flux-cored wire is completed, it is wound on the welding wire disc through the winding machine, and finally sealed in the vacuum packaging bag of the flux-cored wire for use.

[0086] The purity of each raw material component alloy powder of the GTAW welding material is ≥99.1%.

[0087] The particle size of each drug powder of the GTAW welding material is 100 mesh.

[0088] The laser cladding + GTAW welding material prepared by the implementation case 3 is used to prepare a nickel-based alloy double transition layer, and a nickel-based alloy welding method using a double transition layer material is used. The specific steps are as follows (as shown in Figure 1 ). Step 1, the two nickel-based alloy plates to be welded are opened on one side of the bevel for welding, and a V-shaped groove is formed between the two nickel-based alloy plates, with a single side angle of 13°; Step 2, laser cladding layer preparation is carried out on the surface of the opened groove, the laser cladding material prepared in this embodiment is selected, the laser power is 2kW, and the cladding layer thickness is 1.3mm; Step 3, select the GTAW welding material prepared in this embodiment, and use hot wire GTAW automatic welding process to prepare the surfacing layer on the surface of the laser cladding layer obtained in step 2, the welding current is 165A, the surfacing layer thickness is 3.0mm, and the interlayer temperature is controlled at 35℃.

[0089] Step 4, butt welding is carried out on the two nickel-based alloy plates with double transition layers obtained in step 3, the welding material is ERNiCrCoMo-1, the welding method is hot wire GTAW automatic welding process, the welding current is 165A, and the interlayer temperature is controlled at 20~50℃.

[0090] The above joint is subjected to nondestructive testing, microstructure observation and mechanical property testing, and the results are as follows: (1) According to the NB / T 47013.2 "Nondestructive Testing of Pressure Equipment Part 2: Radiographic Testing" specification, the above-mentioned heat-treated welded test plate was subjected to radiographic testing, and the results showed that the radiographic testing technology level was AB level, and the quality level was I level qualified.

[0091] (2) The NB / T 47014-2023 "Welding Procedure Qualification of Pressure Equipment" was subjected to tensile test on the above-mentioned welded joint. The results showed that the tensile strength of the joint was 1011 MPa, and the tensile strength of the aged base material was 1010 MPa, which indicated that the joint realized excellent strength matching with the base material.

[0092] Example 4 The preparation method of the laser cladding material is as follows: Step 1: Fe powder 21.0%, Cr powder 16.0%, Co powder 6.0%, W powder 6.0%, Al powder 0.6%, Ti powder 0.6%, and the rest is Ni powder, the sum of the mass percentages of the above components is 100%; Step 2: The alloy powders in step 1 are mixed and vacuum melted, and the gas atomization method is used for powdering; Step 3: The atomized alloy powder is sieved to make the sieved alloy powder within a certain particle size range. Step 4: The prepared powder is vacuum packaged and ready for use.

[0093] In step 2, a vacuum melting equipment is used, N2 is used as the atomizing gas, the atomizing pressure is 6.1 MPa, and the superheat degree of the melt is kept at 110℃ during the atomizing process.

[0094] In step 3, the particle size of the sieved alloy powder is 50μm.

[0095] The flowability of the sieved alloy powder is required to be 35s / 100g.

[0096] The purity of each raw material component alloy powder of the laser cladding material is ≥99.9%.

[0097] The preparation method of the GTAW welding material is as follows: Step 1: Co powder 51.0%, W powder 11.0%, Al powder 2.1%, Ti powder 2.1%, and the rest is Ni powder, the sum of the mass percentages of the above components is 100%; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated, the heating temperature is 210℃, the holding time is 1.1h, and the crystal water in the powder is removed; the dried powder is placed in a powder mixer for thorough mixing, and the mixing time is 1.1h; Step 3: Inconel 625 strip is used as the welding skin, alcohol is used to remove grease on the surface of the Inconel 625 strip, the drug powder prepared in step 2 is wrapped in the Inconel 625 strip through the core wire drawing equipment, and the first drawing die hole diameter is 2.6 mm; In step 3, the thickness of the Inconel 625 strip is 0.4 mm, and the width is 7 mm; the filling rate of the flux-cored wire is controlled at 31wt%.

[0098] Step 4: After the first process of drawing is completed, the die hole diameter is gradually reduced, and finally the flux-cored wire with a diameter of 1.2 mm is obtained.

[0099] Step 5: After the drawing of the flux-cored wire is completed, it is wound on the welding wire disc through the winding machine, and finally sealed in the vacuum packaging bag of the flux-cored wire for use.

[0100] The purity of each raw material component alloy powder of the GTAW welding material is ≥99.1%.

[0101] The particle size of each drug powder of the GTAW welding material is 200 mesh.

[0102] The laser cladding + GTAW welding material prepared by the implementation case 4 is used to prepare a nickel-based alloy double transition layer, and a nickel-based alloy welding method using a double transition layer material is used. The specific steps are as follows (as shown in Figure 1 ). Step 1, the two nickel-based alloy plates to be welded are opened on one side for welding with a bevel, and a V-shaped groove is formed between the two nickel-based alloy plates, with a single side angle of 11°; Step 2, laser cladding layer preparation is carried out on the surface of the opened groove, the laser cladding material prepared in this embodiment is selected, the laser power is 1.1 kW, and the cladding layer thickness is 1.1 mm; Step 3, the GTAW welding material prepared in this embodiment is selected, and a hot wire GTAW automatic welding process is used to prepare a cladding layer on the surface of the laser cladding layer obtained in step 2, the welding current is 131 A, the cladding layer thickness is 2.1 mm, and the interlayer temperature is controlled at 21℃.

[0103] Step 4, the two nickel-based alloy plates with double transition layers obtained in step 3 are butt welded, the welding material is ERNiCrCoMo-1, the welding method is a hot wire GTAW automatic welding process, the welding current is 135 A, and the interlayer temperature is controlled at 21℃.

[0104] The above joint is subjected to nondestructive testing, microstructure observation and mechanical property testing, and the results are as follows: (1) Radiographic testing was performed on the above-mentioned heat-treated welded test plate in accordance with NB / T 47013.2 "Non-destructive testing of pressure equipment - Part 2: Radiographic testing". The results showed that the radiographic testing technology level was AB and the quality level was I qualified.

[0105] (2) NB / T 47014-2023 "Welding Procedure Qualification for Pressure Equipment" conducted a tensile test on the above-mentioned welded joint. The results showed that the tensile strength of the joint was 1004 MPa, of which the tensile strength of the aged base material was 1010 MPa, indicating that the joint achieved excellent strength matching with the base material.

[0106] Example 5 The specific steps for preparing laser cladding materials are as follows: Step 1: Weigh out the following components by mass percentage: 22.0% Fe powder, 15.5% Cr powder, 5.1% Co powder, 5.5% W powder, 0.65% Al powder, 0.65% Ti powder, with the remainder being Ni powder. The sum of the mass percentages of the above components is 100%. Step 2: Mix the raw material alloy powders from Step 1 and then vacuum melt them, using a gas atomization method to produce powder; Step 3: Perform particle size sieving on the atomized alloy powder to ensure that the sieved alloy powder is within a certain particle size range. Step 4: Vacuum package the prepared powder for later use.

[0107] In step 2, a vacuum melting device is used, with N2 as the atomizing gas and an atomization pressure of 7.5 MPa. During the atomization process, the superheat of the melt is maintained at 145°C.

[0108] In step 3, the particle size of the alloy powder after sieving is 36 μm.

[0109] The flowability requirement for the sieved alloy powder is 28s / 100g.

[0110] The purity of each raw material component alloy powder in the laser cladding material is ≥99.9%.

[0111] The preparation method of GTAW welding material, and the specific steps are as follows: Step 1: Weigh out 52.0% Co powder, 12.0% W powder, 2.2% Al powder, 2.2% Ti powder, and the remainder Ni powder by mass percentage. The sum of the mass percentages of the above components is 100%. Step 2: Place the weighed powder from Step 1 into a vacuum heating furnace and heat it at 215℃ for 1.3 hours to remove the water of crystallization from the powder. After drying, place the powder into a powder mixer for thorough mixing for 1.3 hours. Step 3: Inconel 625 strip is used as the welding skin, alcohol is used to remove grease on the surface of the Inconel 625 strip, the drug powder prepared in step 2 is wrapped in the Inconel 625 strip through the core wire drawing equipment, and the first drawing die hole diameter is 2.6 mm; In step 3, the thickness of the Inconel 625 strip is 0.4 mm, and the width is 7 mm; the filling rate of the flux-cored wire is controlled at 32wt%.

[0112] Step 4: After the first process of drawing is completed, the die hole diameter is sequentially reduced, and finally the flux-cored wire with a diameter of 1.2 mm is obtained.

[0113] Step 5: After the drawing of the flux-cored wire is completed, it is wound on the welding wire disc through the winding machine, and finally sealed in the vacuum packaging bag of the flux-cored wire for use.

[0114] The purity of each raw material component alloy powder of the GTAW welding material is ≥99.1%.

[0115] The particle size of each drug powder of the GTAW welding material is 100 mesh.

[0116] The laser cladding + GTAW welding material prepared by the implementation case 5 is used to prepare a nickel-based alloy double transition layer, and a nickel-based alloy welding method using a double transition layer material is used. The specific steps are as follows (as shown in Figure 1 ). Step 1, the two nickel-based alloy plates to be welded are opened on one side for welding with a bevel, and a V-shaped groove is formed between the two nickel-based alloy plates, with a single side angle of 14.5°; Step 2, laser cladding layer preparation is carried out on the surface of the opened groove, the laser cladding material prepared in this embodiment is selected, the laser power is 2.6 kW, and the cladding layer thickness is 1.4 mm; Step 3, the GTAW welding material prepared in this embodiment is selected, and a hot wire GTAW automatic welding process is used to prepare a cladding layer on the surface of the laser cladding layer obtained in step 2, the welding current is 180 A, the cladding layer thickness is 3.5 mm, and the interlayer temperature is controlled at 45℃.

[0117] Step 4, the two nickel-based alloy plates with double transition layers obtained in step 3 are butt welded, the welding material is ERNiCrCoMo-1, the welding method is a hot wire GTAW automatic welding process, the welding current is 180 A, and the interlayer temperature is controlled at 45℃.

[0118] The above joint is subjected to nondestructive testing, microstructure observation and mechanical property testing, and the results are as follows: (1) According to the NB / T 47013.2 "Nondestructive Testing of Pressure Equipment Part 2: Radiographic Testing" specification, the above-mentioned heat-treated welded test plate was subjected to radiographic testing, and the results showed that the radiographic testing technology level was AB level, and the quality level was I level qualified.

[0119] (2) The NB / T 47014-2023 "Welding Procedure Qualification of Pressure Equipment" was subjected to tensile test on the above-mentioned welded joint. The results showed that the tensile strength of the joint was 1003 MPa, and the tensile strength of the aged base material was 1010 MPa, which indicated that the joint realized excellent strength matching with the base material.

[0120] Example 6 The preparation method of the laser cladding material is as follows: Step 1: Fe powder 29.0%, Cr powder 19.0%, Co powder 9.0%, W powder 9.0%, Al powder 0.9%, Ti powder 0.9%, and the rest is Ni powder, the sum of the mass percentages of the above components is 100%; Step 2: The alloy powders in step 1 are mixed and vacuum melted, and the gas atomization method is used for powdering; Step 3: The atomized alloy powder is sieved to make the sieved alloy powder within a certain particle size range. Step 4: The prepared powder is vacuum packaged and ready for use.

[0121] In step 2, a vacuum melting equipment is used, N2 is used as the atomizing gas, the atomizing pressure is 7.9 MPa, and the superheat degree of the melt is kept at 149℃ during the atomizing process.

[0122] In step 3, the particle size range of the sieved alloy powder is 50μm.

[0123] The flowability of the sieved alloy powder is required to be 39s / 100g.

[0124] The purity of each raw material component alloy powder of the laser cladding material is ≥99.9%.

[0125] The preparation method of the GTAW welding material is as follows: Step 1: Co powder 59.0%, W powder 19.0%, Al powder 3.9%, Ti powder 3.9%, and the rest is Ni powder, the sum of the mass percentages of the above components is 100%; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated, the heating temperature is 259℃, the holding time is 1.9h, and the crystal water in the powder is removed; the dried powder is placed in a powder mixer for thorough mixing, and the mixing time is 1.9h; Step 3: Inconel 625 strip is used as the welding skin, alcohol is used to remove grease on the surface of the Inconel 625 strip, the drug powder prepared in step 2 is wrapped in the Inconel 625 strip through the core wire drawing equipment, and the first drawing die hole diameter is 2.6 mm; In step 3, the thickness of the Inconel 625 strip is 0.4 mm, and the width is 7 mm; the filling rate of the flux-cored wire is controlled at 30wt%.

[0126] Step 4: After the first process of drawing is completed, the die hole diameter is sequentially reduced, and finally the flux-cored wire with a diameter of 1.2 mm is obtained.

[0127] Step 5: After the drawing of the flux-cored wire is completed, it is wound on the welding wire disc through the winding machine, and finally sealed in the vacuum packaging bag of the flux-cored wire for use.

[0128] The purity of each raw material component alloy powder of the GTAW welding material is ≥99.1%.

[0129] The particle size of each drug powder of the GTAW welding material is 150 mesh.

[0130] The laser cladding + GTAW welding material prepared by the implementation case 6 is used to prepare a nickel-based alloy double transition layer, and a nickel-based alloy welding method using a double transition layer material is used. The specific steps are as follows (as shown in Figure 1 ). Step 1, the two nickel-based alloy plates to be welded are opened on one side for welding with a bevel, and a V-shaped groove is formed between the two nickel-based alloy plates, with a single side angle of 14.9°; Step 2, laser cladding layer preparation is performed on the surface of the opened groove, the laser cladding material prepared in this embodiment is selected, the laser power is 2.7 kW, and the cladding layer thickness is 1.49 mm; Step 3, the GTAW welding material prepared in this embodiment is selected, and a hot wire GTAW automatic welding process is used to prepare a cladding layer on the surface of the laser cladding layer obtained in step 2, the welding current is 144 A, the cladding layer thickness is 2.9 mm, and the interlayer temperature is controlled at 38℃.

[0131] Step 4, the two nickel-based alloy plates with double transition layers obtained in step 3 are butt welded, the welding material is ERNiCrCoMo-1, the welding method is a hot wire GTAW automatic welding process, the welding current is 150 A, and the interlayer temperature is controlled at 48℃.

[0132] The above joint is subjected to nondestructive testing, microstructure observation and mechanical property testing, and the results are as follows: (1) According to the NB / T 47013.2 "Non-destructive testing of pressure equipment Part 2: Radiographic testing" specification, the above-mentioned heat-treated welded test plate was radiographic tested, and the results showed that the radiographic testing technology level was AB level, and the quality level was I level qualified.

[0133] (2) The above-mentioned welded joint was subjected to tensile test according to NB / T 47014-2023 "Welding procedure qualification of pressure equipment". The results showed that the tensile strength of the joint was 1011 MPa, and the tensile strength of the aged base material was 1010 MPa, which indicated that the joint realized excellent strength matching with the base material.

Claims

1. A nickel-based alloy laser cladding + GTAW dual transition layer material, characterized in that, The laser cladding material and the GTAW welding material; The laser cladding material comprises the following components in percentage by mass: Fe powder 20.0-30.0%, Cr powder 15.0-20.0%, Co powder 5.0-10.0%, W powder 5.0-10.0%, Al powder 0.5-1.0%, Ti powder 0.5-1.0%, and the rest is Ni powder, and the sum of the percentage by mass of the above components is 100%. The GTAW welding material comprises powder and a welding sheath, wherein the powder comprises the following components in percentage by mass: Co powder 50.0-60.0%, W powder 10.0-20.0%, Al powder 2.0-4.0%, Ti powder 2.0-4.0%, and the rest is Ni powder, and the sum of the percentage by mass of the above components is 100%.

2. The nickel-based alloy laser clad + GTAW dual transition layer material of claim 1, wherein, The particle size of each powder of the GTAW welding material is 100-200 mesh.

3. The nickel-based alloy laser clad + GTAW dual transition layer material of claim 1, wherein, The welding sheath of the GTAW welding material is an Inconel 625 strip with a thickness of 0.4 mm and a width of 7 mm.

4. The nickel-based alloy laser clad + GTAW dual transition layer material of claim 1, wherein, The filling rate of the GTAW welding material is controlled to be 30-32 wt%.

5. The nickel-based alloy laser clad + GTAW dual transition layer material of claim 1, wherein, The preparation method of the laser cladding material comprises the following steps: Step 1: Fe powder 20.0-30.0%, Cr powder 15.0-20.0%, Co powder 5.0-10.0%, W powder 5.0-10.0%, Al powder 0.5-1.0%, Ti powder 0.5-1.0%, and the rest is Ni powder are weighed in percentage by mass, and the sum of the percentage by mass of the above components is 100%. Step 2: The alloy powders in step 1 are mixed and vacuum melted, and the powders are prepared by gas atomization method. Step 3: The atomized alloy powders are sieved by particle size. Step 4: The prepared powders are vacuum packaged and ready for use.

6. The nickel-based alloy laser clad + GTAW dual transition layer material of claim 5, wherein, In the preparation method of the laser cladding material: In step 2, a vacuum melting device is used, N2 is used as the atomizing gas, the atomizing pressure is 6-8 MPa, and the superheat degree of the melt is kept at 100-150℃ during the atomization process. In step 3, the particle size of the sieved alloy powders is 25-53 μm. The flowability of the sieved alloy powders is required to be 25-40 s / 100 g.

7. The nickel-based alloy laser clad + GTAW dual transition layer material of claim 1, wherein, The preparation method of the GTAW welding material comprises the following steps: Step 1: Co powder 50.0-60.0%, W powder 10.0-20.0%, Al powder 2.0-4.0%, Ti powder 2.0-4.0%, and the rest is Ni powder are weighed in percentage by mass, and the sum of the percentage by mass of the above components is 100%. Step 2: The powders weighed in step 1 are placed in a vacuum heating furnace and heated at a temperature of 200-260℃ for 1-2 h; the dried powders are placed in a powder mixer for thorough mixing for 1-2 h; Step 3: Inconel 625 strip is used as the welding sheath, alcohol is used to remove the grease on the surface of the Inconel 625 strip, the powders prepared in step 2 are wrapped in the Inconel 625 strip through a core wire drawing equipment, and the first drawing die has a hole diameter of 2.6 mm. In step 3, the filling rate of the flux-cored wire is controlled at 30wt%-32wt%; Step 4: After the first process of drawing is completed, the hole diameter of the mold is reduced in turn, and finally the diameter of the flux-cored wire is 1.2mm; Step 5: After the drawing of the flux-cored wire is completed, it is wound on the welding wire disc by the winding machine, and finally sealed in the vacuum packaging bag of the flux-cored wire for use.

8. A method of welding nickel-base alloys using a dual transition layer material, characterized in that, The nickel-based alloy laser cladding+GTAW double transition layer material as claimed in claim 1 is used for welding, and the specific steps are as follows: Step 1, the two nickel-based alloy plates to be welded are opened on one side of the welding groove; Step 2, laser cladding layer preparation is carried out on the surface of the opened groove, and the laser cladding material of claim 1 is selected; Step 3, the GTAW welding material of claim 1 is selected, and the hot wire GTAW automatic welding process is used to prepare the surfacing layer on the surface of the laser cladding layer obtained in step 2; Step 4, the two nickel-based alloy plates with double transition layers obtained in step 3 are butt welded, and the welding material is ERNiCrCoMo-1.

9. The method of welding nickel-base alloys using a dual transition layer material of claim 8, wherein, In step 1, a V-shaped groove is formed between the two nickel-based alloy plates to be welded, and the single-side angle is 10°-15°; In step 2, when laser cladding is carried out, the laser power is 1kW-3kW, and the cladding layer thickness is 1.0mm-1.5mm; In step 3, the welding current is 130A-200A, the surfacing layer thickness is 2.0mm-4.0mm, and the interlayer temperature is controlled at 20℃-50℃; In step 4, the welding method is hot wire GTAW automatic welding process, the welding current is 130A-200A, and the interlayer temperature is controlled at 20℃-50℃.

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