High-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation and control and application thereof

Abstract

The invention relates to the technical field of welding materials, in particular to a high-efficiency deposited nickel-based welding wire capable of preventing welding cracks based on phase regulation and application of the high-efficiency deposited nickel-based welding wire, and the nickel-based welding wire comprises the following chemical components in percentage by weight: less than or equal to 0.03% of C, 0.10-0.20% of Si, 2.9-3.2% of Mn, and 1t of P; 0.005%, S: lt; 0.003% of Cu, 19.7-20.5% of Cr, less than or equal to 0.04% of Co, and 1t of Cu; the Ni-based alloy comprises the following components in percentage by weight: 0.10% of Ni, 0.3-0.6% of Ti, 0.4-2.0% of Fe, 2.1-2.9% of Nb, less than or equal to 0.3% of Mo, less than or equal to 0.01% of N, less than or equal to 0.005% of O, less than or equal to 0.50% of other impurity elements and the balance of Ni. The specific value of Ti to Nb is controlled to be 0.10-0.22, the specific value of C to Nb + Ti is controlled to be 0.012 or below, appropriate morphology and distribution of (Nb, Ti) C type intergranular precipitates are obtained, precipitation of grain boundary M23C6 is reduced, and the creep resistance and high-temperature deplasticity crack resistance of the material are effectively optimized.

Description

Technical Field

[0001] The invention relates to the technical field of welding materials, and in particular to a high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation and application thereof. Background Art

[0002] The performance of nickel-based welding materials is unstable during on-site welding, and two types of welding defects often appear in the weld metal, namely high-temperature deplastic cracks (DDC) and inclusion defects. DDC is a type of welding hot crack, which occurs in the high-temperature stage after complete solidification. It has the characteristics of intercrystalline and no intercrystalline liquid film. Conventional non-destructive testing methods are difficult to fully detect it. DDC often becomes the origin of other cracks, and its potential harm is relatively large, bringing hidden dangers to the manufacturing quality and safe operation of related equipment.

[0003] The DDC sensitivity of nickel-based weld metal is related to the elements and precipitates in the material. The alloy elements affect the type, quantity and distribution of the precipitates, which in turn affect the DDC sensitivity of the weld metal. There are two main types of precipitates in nickel-based welds. One type of precipitate is MX, which can reduce the DDC sensitivity of the weld metal. The MX precipitate precipitates during the solidification process, which can pin the grain boundary, hinder the migration of the grain boundary, form a curved grain boundary, and reduce the DDC sensitivity. The other type of precipitate is M 23 C6; Researchers believe that M 23 There will be a large mismatch between C6 and the matrix, which will lead to stress concentration at both ends of the carbide, promote the nucleation of cracks, and easily cause DDC. Summary of the invention

[0004] The first object of the present invention is to provide a highly efficient deposited nickel-based welding wire for preventing welding cracks based on phase regulation, so as to solve the problems of high crack sensitivity, crack defects and oxidation inclusions in the welding process of the existing nickel-based welding wire.

[0005] The invention discloses a highly efficient deposited nickel-based welding wire for preventing welding cracks based on phase regulation. The chemical composition of the nickel-based welding wire is as follows by weight percentage: C: ≤0.03%, Si: 0.10-0.20%, Mn: 2.9%-3.2%, P: <0.005%, S: <0.003%, Cr: 19.7-20.5%, Co: ≤0.04%, Cu: <0.10%, Ti: 0.3-0.6%, Fe: 0.4-2.0%, Nb: 2.1-2.9%, Mo: ≤0.3%, N: ≤0.01%, O ≤0.005%, the sum of other impurity elements: ≤0.50%, and Ni is the balance;

[0006] Specifically, the functions of the various elements of the nickel-based welding wire of the present invention are as follows:

[0007] Ni, Cr, Fe: Ni is an austenite matrix and an element that stabilizes austenite; Cr plays a major role in solid solution strengthening in nickel-based alloys and is a carbide-forming element. It plays an important role in stabilizing the alloy surface and can form an anti-oxidation and anti-corrosion protective layer on the surface of the matrix material. In the present invention, the Cr content is controlled between 19.7% and 20.5%. Within the above range, the chromium content is high enough to stabilize the austenite structure, while not excessive enough to cause the formation of brittle δ phase or other harmful phases, thereby maintaining the toughness and ductility of the alloy; the addition of Fe can reduce the alloy cost, and the addition amount is controlled at 0.4-2.0%. The iron content is strictly controlled within the above range to prevent excessive iron from causing the formation of unfavorable phases such as σ phase and α' phase, which may reduce the toughness and ductility of the alloy and may affect its processing performance;

[0008] The invention relates to a Mn content controlled within 2.9-3.2%. The addition of Mn is beneficial to reducing the hot crack tendency of the nickel-based alloy caused by the low-melting eutectic phase. On the one hand, Mn has good desulfurization and deoxidation effects, and can be combined with S to form MnS (melting point 1610°C), reducing the tendency of the sulfide low-melting eutectic liquid film and reducing the hot crack tendency. On the other hand, Mn is also a strong deoxidizing element, which reduces the oxygen content in the weld and reduces the formation of low-melting silicates, thereby reducing the hot crack tendency. The Mn content is controlled within 2.9-3.2%, and the Mn content can fully play its role in reducing the hot crack tendency and improving the processing performance without affecting the main properties of the alloy. Too high a Mn content may introduce other adverse effects, such as increasing the hardness of the alloy or changing its magnetic properties. Too low a Mn content cannot effectively achieve the above effects.

[0009] In the nickel-based alloy weld structure, Nb can be dissolved in the matrix γ phase to reduce the stacking fault energy of the matrix and play a role in solid solution strengthening. The bonding force between Ti and C is stronger than that of Cr, which can prevent the grain boundary from being depleted in Cr and the occurrence of intergranular corrosion. The Ti content of the present invention is between 0.3% and 0.6%. Under the premise of ensuring that the deposited metal precipitation phase is suitable, the oxide in the weld pool is reduced, so that the deoxidation effect of the welding process is obvious, the fluidity of the weld pool is improved, and the inclusions formed in the welding process float to the surface of the weld pool, and it is not easy to form inclusion defects.

[0010] In nickel-based alloys, Si can be used as an alloying element, but also has harmful effects. First, Si can be used as a deoxidizer and participate in the deoxidation reaction. A small amount of Si can increase the wettability of liquid metal and improve weld bead formation. In addition, Si can also improve the strength of the material. On the other hand, Si can form a low-melting-point eutectic and increase the sensitivity to thermal cracking. Therefore, the factor of Si should be considered in alloy design. The content of Si in the present invention can be controlled at 0.10% to 0.20%. The use of the above percentage of Si is the key to achieving the best deoxidation effect, improving welding characteristics and enhancing material strength in nickel-based alloys. At the same time, it also effectively avoids the risks brought by high silicon content. Such a component design takes into account both the requirements of the manufacturing process and the quality requirements of the final product, ensuring the reliability and durability of the alloy in various application environments.

[0011] The solubility of S and P in nickel-based alloys is very small, and it is very easy to form grain boundary segregation, produce low melting point eutectic, segregate at the grain boundary, and increase the crack tendency; therefore, in nickel-based alloys, the content should be strictly controlled and reduced as much as possible. In the present invention, the S content is controlled to be less than 0.003%, and the P content is controlled to be less than 0.005%;

[0012] The presence of Cu in the nickel-based alloy makes it easy to form a second phase during welding, which increases the thermal cracking tendency of the alloy, so Cu should be controlled to a minimum value; the present invention designs the Cu content to be controlled below 0.10%, which can minimize the above-mentioned adverse effects without affecting the main properties of the alloy, ensuring that the alloy has good mechanical properties, corrosion resistance and welding performance;

[0013] In nickel-based alloys, Mo can not only increase high temperature strength, but also increase corrosion resistance, but Mo will promote the formation of Laves phase, which has an adverse effect on plasticity and crystallization cracks. By strictly controlling the Mo content to ≤0.3%, it is possible to minimize the formation of Laves phase while taking advantage of its beneficial effects.

[0014] In the material, O and N are inevitable residual elements, but they are not essential elements in the alloy. In all cases, the oxygen content is limited to below 0.005%, the lower the better; N can improve the strength of the weld deposited metal and is generally controlled below 0.01%.

[0015] As a preferred embodiment of the present invention, the weight percentage of Nb is 2.2-2.75%;

[0016] A narrower Nb content range can more effectively prevent the formation of Laves phase and maintain the plasticity and weldability of the alloy.

[0017] As a preferred embodiment of the present invention, the weight ratio of Ti to Nb is 0.1-0.22; the weight ratio of C to Ti+Nb is ≤0.012;

[0018] Nb and Ti elements have a cooperative relationship in improving the DDC sensitivity of welding wire deposited metal. Nb and Ti elements have a strong affinity with C. Since the precipitation temperature of TiC is high, the NbC precipitated later will nucleate and grow as TiC, and the stability of the composite carbide of Nb and Ti is significantly higher than that of the single carbide of Nb and Ti. Therefore, replacing part of the Ti element with Nb and controlling the ratio of Ti to Nb between 0.1-0.22, a suitable (Nb, Ti) C-type composite carbide is obtained, which can pin the grain boundary, hinder the migration of the grain boundary, make the grain boundary tortuosity, and improve the creep resistance and DDC crack resistance of the material.

[0019] M 23 There will be a large mismatch between C6 and the matrix, which will lead to stress concentration at both ends of the carbide, promote the nucleation of cracks, and easily cause DDC; Nb and Ti are alloying elements that form carbides. Controlling the ratio of C and Nb+Ti below 0.012 can increase the amount of solid C in the grain, reduce the amount of C segregation at the grain boundary, and inhibit M 23 The precipitation of C6 carbide reduces the DDC sensitivity of the weld while ensuring that there are no inclusion defects in the welding process.

[0020] As a preferred embodiment of the present invention, the diameter of the nickel-based welding wire is in the range of 0.9-1.6 mm.

[0021] As a preferred embodiment of the present invention, the diameters of the nickel-based welding wire are 0.9 mm, 1.2 mm and 1.6 mm.

[0022] As a preferred embodiment of the present invention, the weight percentage of P is <0.003%;

[0023] Further reducing the phosphorus content can significantly improve the long-term stability and reliability of the material, reduce the need for maintenance and replacement, and extend the service life of the product; by reducing the presence of phosphorus, the corrosion resistance of the alloy in corrosive environments can be significantly enhanced, especially the ability to resist chloride ion corrosion.

[0024] The second purpose of the present invention is to provide an application of a highly efficient nickel-based welding wire based on phase regulation to prevent welding cracks. When the cladding thickness reaches 50 mm, the deposited metal has no cracks or defects, which effectively solves the problem that the current welding wire is prone to crack defects under harsh conditions such as on-site welding.

[0025] Specifically, the application of efficient deposited nickel-based welding wire for preventing welding cracks based on phase regulation includes the following steps:

[0026] The hot wire double tungsten electrode TIG welding method is adopted to preheat the nickel-based welding wire by electric heating, the welding current is 220-300A, and the welding voltage is 12-16V;

[0027] With the above parameters, the maximum welding heat input of a single tungsten electrode is 25KJ, and the maximum welding heat input of a double tungsten electrode is 50KJ. The higher heat input makes the filling amount of each weld larger, reduces the number of layers to be welded and the total welding time, and significantly improves the welding wire deposition efficiency.

[0028] Electric preheating of the welding wire helps ensure that the welding wire is at a higher temperature when it enters the molten pool, reducing the temperature gradient of the molten pool, making the molten pool temperature more uniform, which is conducive to forming high-quality welds. At the same time, preheating the welding wire can reduce the formation of defects such as pores and slag inclusions in the weld, improving the quality and reliability of the weld;

[0029] The dual tungsten electrode system allows for more precise control of welding current and voltage, ensuring the stability of the welding process and reducing welding quality issues caused by parameter fluctuations.

[0030] As a preferred embodiment of the present invention, the preheating temperature of the nickel-based welding wire is 300°C;

[0031] Preheating to 300°C helps ensure that the welding wire is at a higher temperature when it enters the molten pool, which can effectively slow down the cooling rate of the molten pool, reduce the thermal stress caused by rapid cooling, and reduce the tendency of thermal crack formation. The preheating temperature of 300°C helps stabilize the strengthening phases in the alloy, such as carbides such as NbC and TiC, and further improve the mechanical properties of the weld metal.

[0032] As a preferred embodiment of the present invention, in the hot wire double tungsten electrode TIG welding method:

[0033] Two tungsten electrodes are placed in the nozzle of the welding gun, and the two tungsten electrodes are powered by two TIG welding power supplies respectively;

[0034] Two independently powered tungsten electrodes can provide more uniform arc energy distribution, ensuring a more uniform molten pool temperature, which is conducive to the formation of high-quality welds; more uniform energy distribution helps reduce the formation of defects such as porosity and slag inclusions in the weld; the dual power supply system can more accurately control the welding current and voltage, ensuring the stability of the welding process and reducing welding quality problems caused by parameter fluctuations.

[0035] As a preferred embodiment of the present invention, the distance between the two tungsten electrodes is 1-6 mm;

[0036] During welding, arcs are induced between two tungsten electrodes and the workpiece. Under the action of electromagnetic force, the two arcs are coupled into one arc. Appropriate spacing can ensure that the interaction between the two arcs is minimized, thereby providing a more uniform energy distribution, which helps to form a stable and uniform molten pool and improve welding quality.

[0037] If the spacing is less than 1mm, the two arcs may interfere with each other, resulting in arc instability and uneven molten pool; if the spacing exceeds 6mm, it is difficult to ensure the effective synergy of the two arcs, affecting welding efficiency and quality;

[0038] In the range of 1-6mm, the two arcs can effectively cover a larger welding area, increase the amount of deposit per unit time, reduce the number of layers to be welded and the total welding time, and speed up the overall welding process.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) By replacing part of the Ti element with Nb and optimizing the ratio of Nb to Ti (0.1-0.22), as well as controlling the ratio of C to Nb+Ti (≤0.012), appropriate (Nb,Ti)C-type intergranular precipitates are formed in the weld microstructure, reducing harmful M 23 The precipitation of C6 carbide effectively reduces the delayed cracking sensitivity of the weld metal and improves the creep resistance and high temperature loss of plastic crack resistance of the material;

[0041] (2) Appropriate contents of Nb and Ti promote the formation of MX precipitates, which pin the grain boundaries, hinder grain boundary migration, and form curved grain boundaries, thereby further reducing the DDC sensitivity; in addition, the precipitates of Nb and Ti between dendrites inhibit the growth of grain boundaries during the solidification stage, and the formed MC carbides can prevent grain boundary movement and inhibit the generation of cracks;

[0042] (3) Strictly control the content of harmful elements such as S, P, and Cu, reduce the formation of low-melting eutectic, avoid the tendency of hot cracks, and ensure that there are no inclusion defects during the welding process; at the same time, the appropriate amount of Si improves the weld bead formation, enhances the deoxidation effect, and improves the strength of the material;

[0043] (4) By preheating the welding wire to 300°C, combined with a welding current of 220-300A and a voltage of 12-16V, a maximum welding heat input of 25KJ for a single tungsten electrode and a maximum heat input of 50KJ for a double tungsten electrode are achieved, which significantly increases the amount of deposited metal per unit time, reduces the number of welding layers and the total welding time, and greatly improves productivity; the electric heating preheating of the welding wire ensures that the welding wire is at a higher temperature when it enters the molten pool, reduces the temperature gradient of the molten pool, makes the molten pool temperature more uniform, and is conducive to the formation of high-quality welds. More uniform energy distribution reduces the formation of defects such as pores and slag inclusions, and improves the quality and reliability of the weld. Two independently powered tungsten electrodes provide more uniform arc energy distribution, ensuring a more uniform molten pool temperature, which is conducive to forming stable and high-quality welds. The dual power supply system can more accurately control the welding current and voltage, ensuring the stability of the welding process and reducing quality problems caused by parameter fluctuations. The tungsten electrode spacing range of 1-6mm can be flexibly adjusted according to different materials and welding thicknesses to achieve the best welding effect. This flexibility is particularly suitable for welding complex structures, such as multi-layer welding or multi-angle welding, and can better control the welding quality and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematic diagram of the microstructure of the cladding metal formed in Example 1. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0048] In the present invention, the welding wire is smelted in vacuum, and other methods can also be used, as long as the final chemical composition of the welding wire can meet the requirements of the above invention content;

[0049] Embodiment 1:

[0050] The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation in this embodiment has a weight percentage composition of: C: 0.008%, Si: 0.15%, Mn: 3.2%, Cr: 20%, Ti: 0.4%, Fe: 0.4%, Nb: 2.75%, N: 0.005%, impurity elements: ≤0.5%, and Ni is the balance.

[0051] In this embodiment, the ratio of Ti to Nb is 0.145, and the ratio of C to Ti+Nb is 0.0025.

[0052] In this embodiment, the nickel-based welding wire specification is Φ0.9mm, and the hot wire double tungsten electrode TIG welding process parameters are: welding wire preheating temperature 300°C, welding current 220A, welding voltage 12V, wire feeding speed 710mm / min, tungsten electrode spacing 2mm, single tungsten electrode welding heat input 20KJ, and double tungsten electrode welding heat input 40KJ.

[0053] Embodiment 2:

[0054] The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation in this embodiment has a weight percentage composition of C: 0.03%, Si: 0.15%, Mn: 2.9%, Cr: 20%, Ti: 0.3%, Fe: 1.8%, Nb: 2.2%, N: 0.005%, impurity elements: ≤0.5%, and Ni is the balance.

[0055] In this embodiment, the ratio of Ti to Nb is 0.136, and the ratio of C to Ti+Nb is 0.012.

[0056] In this embodiment, the nickel-based welding wire specification is Φ1.2mm, and the hot wire double tungsten electrode TIG welding process parameters are: welding wire preheating temperature 300°C, welding current 250A, welding voltage 14V, wire feeding speed 680mm / min, tungsten electrode spacing 2mm, single tungsten electrode welding heat input 23KJ, and double tungsten electrode welding heat input 46KJ.

[0057] Embodiment 3:

[0058] The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation in this embodiment has a weight percentage composition of C: 0.012%, Si: 0.15%, Mn: 3.0%, Cr: 20%, Ti: 0.4%, Fe: 0.4%, Nb: 2.5%, N: 0.01%, impurity elements: ≤0.5%, and Ni is the balance.

[0059] In this embodiment, the ratio of Ti to Nb is 0.16, and the ratio of C to Ti+Nb is less than 0.00413.

[0060] In this embodiment, the nickel-based welding wire specification is Φ1.6mm, and the hot wire double tungsten electrode TIG welding process parameters are: welding wire preheating temperature 300°C, average welding current 300A, welding voltage 16V, wire feeding speed 660mm / min, tungsten electrode spacing 3mm, single tungsten electrode welding heat input 25KJ, double tungsten electrode welding heat input 50KJ.

[0061] Embodiment 4:

[0062] The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation in this embodiment has a weight percentage composition of C: 0.012%, Si: 0.15%, Mn: 3.0%, Cr: 20%, Ti: 0.4%, Fe: 0.4%, Nb: 2.20%, N: 0.01%, impurity elements: ≤0.5%, and Ni is the balance.

[0063] In this embodiment, the ratio of Ti to Nb is 0.182, and the ratio of C to Ti+Nb is 0.00461.

[0064] The welding wire specifications and welding process parameters of this embodiment are the same as those of Example 3.

[0065] Embodiment 5:

[0066] The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation in this embodiment has a weight percentage composition of C: 0.03%, Si: 0.3%, Mn: 3.0%, Cr: 20%, Ti: 0.6%, Fe: 2.0%, Nb: 2.75%, N: 0.01%, impurity elements: ≤0.5%, and Ni is the balance.

[0067] In this embodiment, the ratio of Ti to Nb is 0.218, and the ratio of C to Ti+Nb is 0.00895.

[0068] The welding wire specifications and welding process parameters of this embodiment are the same as those of Example 3.

[0069] In Examples 1 to 5, a piece of Inconel 600 with a size of 500×150×20 mm (length×width×height) is selected as the substrate, 15 passes are set in each layer, and the surfacing thickness is 50 mm.

[0070] The invention discloses a highly efficient nickel-based welding wire for preventing welding cracks based on phase regulation, and the hot wire double tungsten electrode TIG cladding weld bead is well formed, the weld bead surface has metallic luster and less oxides.

[0071] After the surfacing welding is completed, the surfacing metal is subjected to X-ray inspection, and there are no defects such as pores and cracks, and the forming of the deposited metal meets the standards.

[0072] Reference Figure 1Most of the precipitated phases of the cladding metal are formed between dendrites, and a few are formed near the grain boundaries, which are (Ti, Nb)C.

[0073] In Examples 1-5, the welded cladding metal was subjected to room temperature tensile test and 350°C high temperature tensile test according to GB / T 2652 and GB / T 4338, respectively. The sampling position was the non-dilution zone and the sampling direction was the longitudinal direction.

[0074] Table 1 is the measured results of the embodiment:

[0075]

[0076]

[0077] The side bending test was performed according to the requirements of GB / T 2653. The sampling position was the cladding layer, and the sampling directions were transverse and longitudinal. Table 2 shows the side bending test results of the embodiment.

[0078]

[0079] By using the chemical composition of the nickel-based welding wire designed by the present invention, the room temperature and 350° C. tensile strengths of Examples 1-6 are greater than 600 MPa, and the yield strength is greater than 400 MPa.

[0080] By using the chemical composition of the welding wire and the welding process in this embodiment, no cracks were found in the bending test of the weld overlay layer.

[0081] The welding material designed by the present invention can be used for welding structural parts, and can also be used as a corrosion-resistant material for surfacing on other surfaces.

[0082] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An efficient deposited nickel-based welding wire for preventing welding cracks based on phase regulation, characterized in that: By weight percentage, the chemical composition of the nickel-based welding wire is: C: ≤0.03%, Si: 0.10-0.20%, Mn: 2.9%-3.2%, P: <0.005%, S: <0.003%, Cr: 19.7-20.5%, Co: ≤0.04%, Cu: <0.10%, Ti: 0.3-0.6%, Fe: 0.4-2.0%, Nb: 2.1-2.9%, Mo: ≤0.3%, N: ≤0.01%, O ≤0.005%, the sum of other impurity elements: ≤0.50%, and Ni is the balance.

2. The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation according to claim 1, characterized in that: The weight percentage of Nb is 2.2-2.75%.

3. The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation according to claim 2, characterized in that: The weight ratio of the Ti to the Nb is 0.1-0.22; the weight ratio of the C to the Ti+Nb is ≤0.

012.

4. The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation according to claim 1, characterized in that: The diameter of the nickel-based welding wire ranges from 0.9 to 1.6 mm.

5. The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation according to claim 4, characterized in that: The diameters of the nickel-based welding wires are 0.9 mm, 1.2 mm and 1.6 mm.

6. The high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation according to claim 1, characterized in that: The weight percentage of P is less than 0.003%.

7. The use of a highly efficient deposited nickel-based welding wire for preventing welding cracks based on phase regulation as described in any one of claims 1 to 6, characterized in that: The following steps are involved: A hot wire double tungsten electrode TIG welding method is adopted, and the nickel-based welding wire is preheated by electric heating. The welding current is 220-300A, and the welding voltage is 12-16V.

8. The use of the high-efficiency deposited nickel-based welding wire for preventing welding cracks based on phase regulation as claimed in claim 7, characterized in that: The preheating temperature of the nickel-based welding wire is 300°C.

9. The use of the high-efficiency deposited nickel-based welding wire based on phase regulation to prevent welding cracks as claimed in claim 7, characterized in that: In the hot wire double tungsten electrode TIG welding method: Two tungsten electrodes are placed in the nozzle of the welding gun, and the two tungsten electrodes are powered by two TIG welding power supplies respectively.

10. The use of the high-efficiency deposited nickel-based welding wire based on phase regulation to prevent welding cracks as claimed in claim 9, characterized in that: The distance between the two tungsten electrodes is 1-6 mm.

Images