High-temperature-resistant welding wire and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant welding wire and a preparation method thereof, and relates to the technical field of welding materials, and the high-temperature-resistant welding wire comprises an outer skin and a flux core; the flux core comprises the following components in parts by weight: 10-15 parts of chromium nitride, 5-10 parts of zirconium boride, 60-75 parts of iron, 1-5 parts of holmium, 0.2-0.5 part of calcium oxide and 0.3-0.6 part of fluorite. On the basis of an existing high-temperature-resistant welding wire, a proper amount of holmium and zirconium boride are introduced, the high temperature resistance and other performance of the high-temperature-resistant welding wire are improved through the combined action of all the components, the hardness of the obtained high-temperature-resistant welding wire can be maintained at 720-840 HV at the temperature of 700 DEG C, the use requirement in the high-temperature environment can be met, and the defects in the prior art are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of welding materials, and in particular to a high temperature resistant welding wire and a preparation method thereof. Background Art

[0002] In the field of modern industrial manufacturing, welding technology, as an important means of connecting metal materials, is widely used in many key industries such as aerospace, petrochemical, nuclear power generation, and automobile manufacturing. With the advancement of science and technology and the continuous improvement of industrial needs, especially in extreme environments such as high temperature, high pressure, and corrosion, the performance requirements for welding materials are becoming increasingly stringent. Among them, high-temperature resistant welding wire is a key material for achieving effective connection of materials in high-temperature environments, and its performance is directly related to the strength, stability, and service life of the welded joint.

[0003] Traditional high temperature resistant welding wire is mainly composed of outer skin and flux core. By adjusting the type and content of alloy elements in the flux core, the high temperature resistance of the welding wire can be improved to a certain extent. However, with the continuous increase in the use temperature, traditional welding wire gradually exposes problems such as decreased hardness, insufficient oxidation resistance, and easy cracking of welded joints, which seriously affects the reliability and safety of the welded structure. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a high temperature resistant welding wire and a preparation method thereof.

[0005] In a first aspect, the present invention provides a high temperature resistant welding wire, the high temperature resistant welding wire comprising an outer sheath and a flux core; the flux core comprises the following components in parts by weight:

[0006] 10-15 parts of chromium nitride, 5-10 parts of zirconium boride, 60-75 parts of iron, 1-5 parts of holmium, 0.2-0.5 parts of calcium oxide and 0.3-0.6 parts of fluorite.

[0007] Furthermore, the weight ratio of the chromium nitride to the zirconium boride is (1-2):1.

[0008] Furthermore, the drug core comprises the following components in parts by weight:

[0009] 12 parts of chromium nitride, 8 parts of zirconium boride, 70 parts of iron, 3 parts of holmium, 0.4 parts of calcium oxide and 0.5 parts of fluorite.

[0010] Furthermore, the outer skin includes at least one of an H08A steel strip and a 430 stainless steel strip.

[0011] Furthermore, in terms of weight percentage, the filling rate of the drug core is 55-65%.

[0012] Furthermore, the diameter of the high temperature resistant welding wire is 1.5 to 3.0 mm.

[0013] Furthermore, at a temperature of 700° C., the hardness of the high temperature resistant welding wire is 720-840 HV.

[0014] In a second aspect, the present invention provides a method for preparing the high temperature resistant welding wire according to any one of the first aspects, the preparation method comprising the following steps:

[0015] The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture;

[0016] The outer skin is rolled into shape to obtain a U-shaped groove;

[0017] The flux core mixture is filled into the U-shaped groove, and then drawn to obtain the high temperature resistant welding wire.

[0018] Furthermore, the mesh size of the grinding and sieving is 100 to 150 meshes.

[0019] Furthermore, the working condition parameters of the baking include: a temperature of 130 to 150° C. and a time of 60 to 90 minutes.

[0020] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0021] The embodiment of the present invention provides a high temperature resistant welding wire. On the basis of the existing high temperature resistant welding wire, the present invention introduces an appropriate amount of holmium and zirconium boride. The components work together to improve the high temperature resistance and other properties of the high temperature resistant welding wire. At a temperature of 700°C, the hardness of the obtained high temperature resistant welding wire can be maintained at 720-840HV, which can meet the use requirements in high temperature environments and make up for the shortcomings of the prior art. Specifically, the functions of each component are as follows:

[0022] 1. Chromium nitride (CrN)

[0023] Function: Chromium nitride is a high temperature stable phase that can significantly improve the hardness and wear resistance of the material. At high temperatures, chromium nitride can form a dense oxide protective film that effectively prevents oxygen from diffusing into the matrix, thereby improving the oxidation resistance and corrosion resistance of the welding wire.

[0024] Interaction: Combines with other elements such as iron (Fe) to form complex alloy phases, enhancing the high temperature stability of the material.

[0025] 2. Zirconium boride (ZrB2)

[0026] Function: Zirconium boride is an excellent high-temperature resistant ceramic material with high melting point, high hardness, and good thermal and chemical stability. Its addition can significantly improve the high-temperature hardness and creep resistance of the welding wire.

[0027] Interaction: At high temperatures, zirconium boride interacts with components such as chromium nitride to form a more stable high-temperature phase, further enhancing the high-temperature resistance of the welding wire.

[0028] 3. Iron (Fe)

[0029] Function: As the main matrix element of welding wire, iron provides good weldability and mechanical properties. Combined with other alloying elements, it forms a stable alloy phase and improves the overall performance of welding wire.

[0030] Interaction: Form alloy phase with components such as chromium nitride and zirconium boride to improve the hardness and high temperature resistance of welding wire.

[0031] 4. Holmium (Ho)

[0032] Function: Holmium is a rare earth element with unique physical and chemical properties. Adding an appropriate amount of holmium to the welding wire can refine the grains and improve the density and hardness of the material. At the same time, holmium can also enhance the oxidation resistance of the welding wire at high temperatures.

[0033] Interaction: Form solid solutions or intermetallic compounds with elements such as iron and chromium to improve the high temperature stability and hardness of the welding wire.

[0034] 5. Calcium oxide (CaO)

[0035] Function: As a flux component, calcium oxide can remove oxide inclusions during welding and improve the purity and strength of the weld. At the same time, it can also react with other components in the welding wire to form high-temperature stable compounds.

[0036] Interaction: It works together with fluorite (CaF2) to improve the welding performance and high temperature stability of welding wire.

[0037] 6. Fluorite (CaF2)

[0038] Function: Fluorite can reduce the melting point of welding wire and improve its fluidity and wettability. At the same time, it can also work together with calcium oxide and other components to form a protective layer to prevent the welding wire from oxidizing at high temperatures.

[0039] Interaction: It works together with flux components such as calcium oxide to improve the welding performance and high-temperature oxidation resistance of the welding wire.

[0040] Therefore, the present invention introduces appropriate amounts of holmium and zirconium boride to form a tissue structure that can maintain stable performance at high temperatures and resist material softening caused by high temperatures, thereby improving the high temperature resistance and other properties of the high temperature resistant welding wire and making up for the shortcomings of the prior art. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0043] In a first aspect, the present invention provides a high temperature resistant welding wire, the high temperature resistant welding wire comprising an outer sheath and a flux core; the flux core comprises the following components in parts by weight:

[0044] 10-15 parts of chromium nitride, 5-10 parts of zirconium boride, 60-75 parts of iron, 1-5 parts of holmium, 0.2-0.5 parts of calcium oxide and 0.3-0.6 parts of fluorite.

[0045] The embodiment of the present invention provides a high temperature resistant welding wire. On the basis of the existing high temperature resistant welding wire, the present invention introduces an appropriate amount of holmium and zirconium boride. The components work together to improve the high temperature resistance and other properties of the high temperature resistant welding wire. At a temperature of 700°C, the hardness of the obtained high temperature resistant welding wire can be maintained at 720-840HV, which can meet the use requirements in high temperature environments and make up for the shortcomings of the prior art. Specifically, the functions of each component are as follows:

[0046] 1. Chromium nitride (CrN)

[0047] Function: Chromium nitride is a high temperature stable phase that can significantly improve the hardness and wear resistance of the material. At high temperatures, chromium nitride can form a dense oxide protective film that effectively prevents oxygen from diffusing into the matrix, thereby improving the oxidation resistance and corrosion resistance of the welding wire.

[0048] Interaction: Combines with other elements such as iron (Fe) to form complex alloy phases, enhancing the high temperature stability of the material.

[0049] 2. Zirconium boride (ZrB2)

[0050] Function: Zirconium boride is an excellent high-temperature resistant ceramic material with high melting point, high hardness, and good thermal and chemical stability. Its addition can significantly improve the high-temperature hardness and creep resistance of the welding wire.

[0051] Interaction: At high temperatures, zirconium boride interacts with components such as chromium nitride to form a more stable high-temperature phase, further enhancing the high-temperature resistance of the welding wire.

[0052] 3. Iron (Fe)

[0053] Function: As the main matrix element of welding wire, iron provides good weldability and mechanical properties. Combined with other alloying elements, it forms a stable alloy phase and improves the overall performance of welding wire.

[0054] Interaction: Form alloy phase with components such as chromium nitride and zirconium boride to improve the hardness and high temperature resistance of welding wire.

[0055] 4. Holmium (Ho)

[0056] Function: Holmium is a rare earth element with unique physical and chemical properties. Adding an appropriate amount of holmium to the welding wire can refine the grains and improve the density and hardness of the material. At the same time, holmium can also enhance the oxidation resistance of the welding wire at high temperatures.

[0057] Interaction: Form solid solutions or intermetallic compounds with elements such as iron and chromium to improve the high temperature stability and hardness of the welding wire.

[0058] 5. Calcium oxide (CaO)

[0059] Function: As a flux component, calcium oxide can remove oxide inclusions during welding and improve the purity and strength of the weld. At the same time, it can also react with other components in the welding wire to form high-temperature stable compounds.

[0060] Interaction: It works together with fluorite (CaF2) to improve the welding performance and high temperature stability of welding wire.

[0061] 6. Fluorite (CaF2)

[0062] Function: Fluorite can reduce the melting point of welding wire and improve its fluidity and wettability. At the same time, it can also work together with calcium oxide and other components to form a protective layer to prevent the welding wire from oxidizing at high temperatures.

[0063] Interaction: It works together with flux components such as calcium oxide to improve the welding performance and high-temperature oxidation resistance of the welding wire.

[0064] Therefore, the present invention introduces appropriate amounts of holmium and zirconium boride to form a tissue structure that can maintain stable performance at high temperatures and resist material softening caused by high temperatures, thereby improving the high temperature resistance and other properties of the high temperature resistant welding wire and making up for the shortcomings of the prior art.

[0065] In some specific embodiments, the weight ratio of the chromium nitride to the zirconium boride is (1-2):1, preferably 1.5:1.

[0066] In some specific embodiments, the drug core comprises the following components in parts by weight:

[0067] 12 parts of chromium nitride, 8 parts of zirconium boride, 70 parts of iron, 3 parts of holmium, 0.4 parts of calcium oxide and 0.5 parts of fluorite.

[0068] In some specific embodiments, the outer skin includes at least one of an H08A steel strip and a 430 stainless steel strip.

[0069] In some specific embodiments, the filling rate of the drug core is 55-65% by weight.

[0070] In some specific embodiments, the diameter of the high temperature resistant welding wire is 1.5 to 3.0 mm.

[0071] In some specific embodiments, at a temperature of 700° C., the hardness of the high temperature resistant welding wire is 720-840 HV.

[0072] In a second aspect, the present invention provides a method for preparing the high temperature resistant welding wire according to any one of the first aspects, the preparation method comprising the following steps:

[0073] The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture;

[0074] The outer skin is rolled into shape to obtain a U-shaped groove;

[0075] The flux core mixture is filled into the U-shaped groove, and then drawn to obtain the high temperature resistant welding wire.

[0076] In some specific embodiments, the mesh size of the ground sieve is 100-150 meshes.

[0077] In some specific embodiments, the baking working condition parameters include: a temperature of 130 to 150° C. and a time of 60 to 90 minutes.

[0078] The raw materials involved in the high-temperature resistant welding wire and the preparation method thereof provided by the embodiments of the present invention, unless otherwise specified or described, can be directly commercially available products or homemade according to the existing disclosed preparation methods; at the same time, the operating steps involved in the preparation method of the high-temperature resistant welding wire, unless otherwise specified or described, can be carried out according to the conventional preparation method of the existing welding wire in the art or using existing equipment, and will not be described one by one here.

[0079] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0080] Example 1

[0081] This example provides a high temperature resistant welding wire, the high temperature resistant welding wire comprising an outer sheath and a flux core;

[0082] The core comprises the following components in parts by weight: 12 parts of chromium nitride, 8 parts of zirconium boride, 70 parts of iron, 3 parts of holmium, 0.4 parts of calcium oxide and 0.5 parts of fluorite;

[0083] The outer skin is 430 stainless steel strip;

[0084] In terms of weight percentage, the filling rate of the drug core is 60%;

[0085] The diameter of the high temperature resistant welding wire is 2.0 mm.

[0086] The preparation method of the high temperature resistant welding wire comprises the following steps:

[0087] The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture;

[0088] The outer skin is rolled into shape to obtain a U-shaped groove;

[0089] Filling the flux core mixture into the U-shaped groove, and then drawing to obtain the high temperature resistant welding wire;

[0090] The mesh size of the grinding and sieving is 120 meshes, and the working condition parameters of the baking include: the temperature is 140° C. and the time is 80 minutes.

[0091] Example 2

[0092] This example provides a high temperature resistant welding wire, the high temperature resistant welding wire comprising an outer sheath and a flux core;

[0093] The core comprises the following components in parts by weight: 10 parts of chromium nitride, 5 parts of zirconium boride, 60 parts of iron, 1 part of holmium, 0.2 parts of calcium oxide and 0.3 parts of fluorite;

[0094] The outer skin is H08A steel strip;

[0095] In terms of weight percentage, the filling rate of the drug core is 65%;

[0096] The diameter of the high temperature resistant welding wire is 2.0 mm.

[0097] The preparation method of the high temperature resistant welding wire comprises the following steps:

[0098] The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture;

[0099] The outer skin is rolled into shape to obtain a U-shaped groove;

[0100] Filling the flux core mixture into the U-shaped groove, and then drawing to obtain the high temperature resistant welding wire;

[0101] The mesh size of the grinding and sieving is 120 meshes, and the working condition parameters of the baking include: the temperature is 140° C. and the time is 80 minutes.

[0102] Example 3

[0103] This example provides a high temperature resistant welding wire, the high temperature resistant welding wire comprising an outer sheath and a flux core;

[0104] The core comprises the following components in parts by weight: 15 parts of chromium nitride, 10 parts of zirconium boride, 75 parts of iron, 5 parts of holmium, 0.5 parts of calcium oxide and 0.6 parts of fluorite;

[0105] The outer skin is H08A steel strip;

[0106] The filling rate of the drug core is 55% by weight;

[0107] The diameter of the high temperature resistant welding wire is 2.0 mm.

[0108] The preparation method of the high temperature resistant welding wire comprises the following steps:

[0109] The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture;

[0110] The outer skin is rolled into shape to obtain a U-shaped groove;

[0111] Filling the flux core mixture into the U-shaped groove, and then drawing to obtain the high temperature resistant welding wire;

[0112] The mesh size of the grinding and sieving is 120 meshes, and the working condition parameters of the baking include: the temperature is 140° C. and the time is 80 minutes.

[0113] Comparative Example 1

[0114] This example provides a high temperature resistant welding wire and a preparation method thereof, which is different from Example 1 only in that the amount of zirconium boride is adjusted to 0 part; the remaining steps and parameters are the same.

[0115] This example provides a high temperature resistant welding wire, the high temperature resistant welding wire comprising an outer sheath and a flux core;

[0116] In parts by weight, the core comprises the following components: 12 parts of chromium nitride, 70 parts of iron, 3 parts of holmium, 0.4 parts of calcium oxide and 0.5 parts of fluorite;

[0117] The outer skin is 430 stainless steel strip;

[0118] In terms of weight percentage, the filling rate of the drug core is 60%;

[0119] The diameter of the high temperature resistant welding wire is 2.0 mm.

[0120] The preparation method of the high temperature resistant welding wire comprises the following steps:

[0121] The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture;

[0122] The outer skin is rolled into shape to obtain a U-shaped groove;

[0123] Filling the flux core mixture into the U-shaped groove, and then drawing to obtain the high temperature resistant welding wire;

[0124] The mesh size of the grinding and sieving is 120 meshes, and the working condition parameters of the baking include: the temperature is 140° C. and the time is 80 minutes.

[0125] Comparative Example 2

[0126] This example provides a high temperature resistant welding wire and a preparation method thereof, which is different from Example 1 only in that the amount of zirconium boride is adjusted to 15 parts; the remaining steps and parameters are the same.

[0127] This example provides a high temperature resistant welding wire, the high temperature resistant welding wire comprising an outer sheath and a flux core;

[0128] The core comprises the following components in parts by weight: 12 parts of chromium nitride, 15 parts of zirconium boride, 70 parts of iron, 3 parts of holmium, 0.4 parts of calcium oxide and 0.5 parts of fluorite;

[0129] The outer skin is 430 stainless steel strip;

[0130] In terms of weight percentage, the filling rate of the drug core is 60%;

[0131] The diameter of the high temperature resistant welding wire is 2.0 mm.

[0132] The preparation method of the high temperature resistant welding wire comprises the following steps:

[0133] The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture;

[0134] The outer skin is rolled into shape to obtain a U-shaped groove;

[0135] Filling the flux core mixture into the U-shaped groove, and then drawing to obtain the high temperature resistant welding wire;

[0136] The mesh size of the grinding and sieving is 120 meshes, and the working condition parameters of the baking include: the temperature is 140° C. and the time is 80 minutes.

[0137] Comparative Example 3

[0138] This example provides a high temperature resistant welding wire and a preparation method thereof, which is different from Example 1 only in that the amount of holmium is adjusted to 0; the remaining steps and parameters are the same.

[0139] This example provides a high temperature resistant welding wire, the high temperature resistant welding wire comprising an outer sheath and a flux core;

[0140] The core comprises the following components in parts by weight: 12 parts of chromium nitride, 8 parts of zirconium boride, 70 parts of iron, 0.4 parts of calcium oxide and 0.5 parts of fluorite;

[0141] The outer skin is 430 stainless steel strip;

[0142] In terms of weight percentage, the filling rate of the drug core is 60%;

[0143] The diameter of the high temperature resistant welding wire is 2.0 mm.

[0144] The preparation method of the high temperature resistant welding wire comprises the following steps:

[0145] The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture;

[0146] The outer skin is rolled into shape to obtain a U-shaped groove;

[0147] Filling the flux core mixture into the U-shaped groove, and then drawing to obtain the high temperature resistant welding wire;

[0148] The mesh size of the grinding and sieving is 120 meshes, and the working condition parameters of the baking include: the temperature is 140° C. and the time is 80 minutes.

[0149] Test Case

[0150] In this example, the high temperature resistance performance of the high temperature resistant welding wires provided by Examples 1 to 3 and Comparative Examples 1 to 3 was tested, and the test results are shown in Table 1.

[0151] Table 1

[0152]

[0153]

[0154] In summary, the embodiments of the present invention provide a high temperature resistant welding wire and a preparation method thereof. On the basis of the existing high temperature resistant welding wire, the present invention introduces an appropriate amount of holmium and zirconium boride. The components work together to improve the high temperature resistance and other properties of the high temperature resistant welding wire. At a temperature of 700°C, the hardness of the obtained high temperature resistant welding wire can be maintained at 720-840HV, which can meet the use requirements in high temperature environments and make up for the shortcomings of the prior art.

[0155] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A high temperature resistant welding wire, characterized in that: The high temperature resistant welding wire comprises an outer sheath and a flux core; the flux core comprises the following components in parts by weight: 10-15 parts of chromium nitride, 5-10 parts of zirconium boride, 60-75 parts of iron, 1-5 parts of holmium, 0.2-0.5 parts of calcium oxide and 0.3-0.6 parts of fluorite.

2. The high temperature resistant welding wire according to claim 1, characterized in that: The weight ratio of the chromium nitride to the zirconium boride is (1-2):

1.

3. The high temperature resistant welding wire according to claim 1, characterized in that: The drug core comprises the following components in parts by weight: 12 parts of chromium nitride, 8 parts of zirconium boride, 70 parts of iron, 3 parts of holmium, 0.4 parts of calcium oxide and 0.5 parts of fluorite.

4. The high temperature resistant welding wire according to claim 1, characterized in that: The outer skin includes at least one of an H08A steel strip and a 430 stainless steel strip.

5. The high temperature resistant welding wire according to claim 1, characterized in that: Calculated by weight percentage, the filling rate of the drug core is 55-65%.

6. The high temperature resistant welding wire according to claim 1, characterized in that: The diameter of the high temperature resistant welding wire is 1.5-3.0 mm.

7. The high temperature resistant welding wire according to any one of claims 1 to 6, characterized in that: At a temperature of 700° C., the hardness of the high temperature resistant welding wire is 720-840 HV.

8. A method for preparing a high temperature resistant welding wire according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: The components in the drug core are stirred and mixed, and then ground, sieved, baked and cooled to obtain a drug core mixture; The outer skin is rolled into shape to obtain a U-shaped groove; The flux core mixture is filled into the U-shaped groove, and then drawn to obtain the high temperature resistant welding wire.

9. The method for preparing a high temperature resistant welding wire according to claim 8, characterized in that: The mesh number of the grinding and sieving is 100 to 150 meshes.

10. The method for preparing a high temperature resistant welding wire according to claim 8, characterized in that: The working condition parameters of the baking include: a temperature of 130 to 150° C. and a time of 60 to 90 minutes.

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