High-temperature-resistant and intergranular-corrosion-resistant nickel-based alloy welding rod and manufacturing method thereof

Abstract

The invention relates to a high-temperature-resistant and intergranular-corrosion-resistant nickel-based alloy welding rod and a preparation method thereof. Specifically, the excellent high-temperature-resistant and intergranular-corrosion-resistant nickel-based welding rod is prepared by the following steps: uniformly mixing powder of the following ingredients, then adding potassium-sodium water glass accounting for 22-27% of the total weight of the mixed powder, uniformly stirring, pressing and coating a nickel-based alloy core wire with the mixed powder, and then drying, the powder comprises marble, fluorite, quartz, titanium dioxide, rutile, calcined mica, sodium alginate, microcrystalline cellulose, sodium carbonate, ferrotitanium, electrolytic manganese, niobium powder, chromium metal and ferromolybdenum. When the nickel-based alloy welding rod ENiCrFe-7 is used for welding, the electric arc blowing force is soft and stable, splashing is little, slag covering is complete, deslagging is good, welding seam forming is good, the coating is good in large current resistance, and welding seam metal has excellent high temperature resistance and intergranular corrosion resistance.

Description

Technical Field

[0001] The invention belongs to the field of welding materials and relates to a welding rod, in particular to a nickel-based alloy welding rod that is resistant to high temperature and intergranular corrosion. Background Art

[0002] Nickel-based alloy refers to a type of alloy with high strength and certain anti-oxidation corrosion ability at high temperatures of 650~1000℃. The main alloying elements are nickel, chromium and molybdenum. It has good comprehensive properties and can resist various acid corrosion and stress corrosion. The earliest application (produced in the United States in 1905) is nickel-copper (Ni-Cu) alloy, also known as Monel alloy (Monel alloy Ni70Cu30); in addition, there are nickel-chromium (Ni-Cr) alloy (that is, nickel-based heat-resistant alloy, heat-resistant corrosion alloy in corrosion-resistant alloy), nickel-molybdenum (Ni-Mo) alloy (mainly Hastelloy B series), nickel-chromium-molybdenum (Ni-Cr-Mo) alloy (mainly Hastelloy C series), etc. These nickel-based corrosion-resistant alloys are mainly used to manufacture various corrosion-resistant environment parts in petroleum, chemical industry, electric power, etc.

[0003] Nickel-based alloy materials are commonly used in manufacturing high-temperature parts of aircraft engine blades and rocket engines, nuclear reactors, and energy conversion equipment. This type of welding material has good high-temperature performance, excellent thermal strength, corrosion resistance, and thermal fatigue resistance. It is especially suitable for nuclear power generation equipment, which is usually used in harsh conditions and has high requirements for mechanical properties, corrosion resistance, and reliability. With the development of industry, domestic manufacturers' demand for nuclear power generation has gradually increased, and the demand for nickel-based alloy welding materials has also increased.

[0004] Therefore, the field still expects nickel-based welding rods with excellent high temperature resistance and intergranular corrosion resistance to be used in welding processes. Summary of the invention

[0005] The object of the present invention is to provide a nickel-based alloy welding rod that is resistant to high temperature and intergranular corrosion. The present invention has surprisingly found that the nickel-based welding rod having the characteristics of the present invention exhibits excellent welding process performance and high temperature resistance and intergranular corrosion resistance. The present invention is completed based on this discovery.

[0006] To this end, the present invention provides a nickel-based alloy welding rod resistant to high temperature and intergranular corrosion, characterized in that the welding rod is prepared by uniformly mixing powders in the following weight proportions, then adding potassium sodium water glass accounting for 22-27% of the total weight of the mixed powders, stirring evenly, pressing and coating on a nickel-based alloy welding core (for example, an ERNiCrFe-7 welding core of Φ2.5-4.0 mm), and then drying (for example, drying at low temperature for 12 hours and then drying at high temperature); the weight proportions of the powders are: 20-30 parts of marble, 15-20 parts of fluorite, 2-8 parts of quartz, 2-8 parts of titanium dioxide, 2-10 parts of rutile, 2-8 parts of calcined mica, 0.5-3 parts of sodium alginate, 1-3 parts of microcrystalline cellulose, 1-1.5 parts of soda ash, 1-5 parts of ferrotitanium, 6-18 parts of electrolytic manganese, 2-8 parts of niobium powder, 2-10 parts of metallic chromium, and 2-8 parts of ferromolybdenum.

[0007] The high temperature and intergranular corrosion resistant nickel-based alloy welding rod according to any embodiment of the present invention is characterized in that the specification of the nickel-based alloy welding core is Φ2~5mm, or Ф2.5~4.0mm, for example including but not limited to Ф2.5mm, Ф3.2mm, Ф4.0mm.

[0008] The nickel-based alloy welding rod resistant to high temperature and intergranular corrosion according to any embodiment of the present invention is characterized in that the weight ratio of the powder is: 26 parts of marble, 20 parts of fluorite, 8 parts of quartz, 2 parts of titanium dioxide, 6 parts of rutile, 2 parts of calcined mica, 3 parts of sodium alginate, 3 parts of microcrystalline cellulose, 1 part of soda ash, 1 part of ferrotitanium, 6 parts of electrolytic manganese, 8 parts of niobium powder, 10 parts of metallic chromium, and 2 parts of ferromolybdenum.

[0009] The nickel-based alloy welding rod resistant to high temperature and intergranular corrosion according to any embodiment of the present invention is characterized in that the weight ratio of the powder is: 30 parts of marble, 15 parts of fluorite, 2 parts of quartz, 8 parts of titanium dioxide, 2 parts of rutile, 8 parts of calcined mica, 0.5 parts of sodium alginate, 1 part of microcrystalline cellulose, 1.5 parts of soda ash, 5 parts of ferrotitanium, 18 parts of electrolytic manganese, 2 parts of niobium powder, 2 parts of metallic chromium, and 5 parts of ferromolybdenum.

[0010] According to any embodiment of the present invention, the nickel-based alloy welding rod resistant to high temperature and intergranular corrosion is characterized in that the weight ratio of the powder is: 20 parts of marble, 17 parts of fluorite, 5 parts of quartz, 5 parts of titanium dioxide, 10 parts of rutile, 5 parts of calcined mica, 1.5 parts of sodium alginate, 2 parts of microcrystalline cellulose, 1.2 parts of soda ash, 3 parts of ferrotitanium, 12 parts of electrolytic manganese, 5 parts of niobium powder, 5 parts of metallic chromium, and 8 parts of ferromolybdenum. For example, based on 20 to 30 parts of marble, the powder further includes 3 to 5 parts of bentonite; for example, it has the weight ratio of the powder described in Examples 4-6 respectively; for example, the bentonite contains 85% to 95% of montmorillonite, for example, 88% to 95% of montmorillonite.

[0011] In the powder material ratio of the present invention, due to the strict control of raw materials and the reasonable alloy ratio, the arc blowing force of this electrode is soft and stable during welding, with less spatter, complete slag coverage, good slag removal, smooth weld formation, good high current resistance of the coating, and excellent high mechanical properties of the deposited metal.

[0012] In the steps of the above-mentioned preparation method of the present invention, although the specific steps described therein are different from the steps described in the preparation examples in the specific implementation mode part below in some details or language descriptions, those skilled in the art can fully summarize the above-mentioned method steps based on the detailed disclosure of the full text of the present invention.

[0013] Any embodiment of the present invention can be combined with other embodiments, as long as they do not conflict. In addition, in any embodiment of the present invention, any technical feature can be applied to the technical features in other embodiments, as long as they do not conflict. The present invention is further described below.

[0014] The various terms and phrases used in the present invention have general meanings known to those skilled in the art. Even so, the present invention still hopes to provide a more detailed description and explanation of these terms and phrases herein. If the mentioned terms and phrases are inconsistent with the known meanings, the meanings expressed in the present invention shall prevail.

[0015] In the present invention, the term "parts by weight" indicates the relative amount of each component in the electrode coating of the present invention, and the "parts by weight" may be an absolute weight (e.g., mg, g, or kg, etc.) or a weight percentage (e.g., weight % or wt%). Of course, when expressed in weight percentage (e.g., weight % or wt%), a preferred embodiment is that the sum of each component is 100%.

[0016] In the present invention, the various ingredients used are well known in the art, such as marble, fluorite, quartz, titanium dioxide, rutile, calcined mica, sodium alginate, microcrystalline cellulose, soda ash, ferrotitanium, electrolytic manganese, niobium powder, metallic chromium, ferromolybdenum, and potassium sodium water glass, etc., which can be directly purchased from the market with the above-mentioned product names.

[0017] In order to facilitate understanding of the invention, the main functions of the components of the Chinese medicine skin raw material of the present invention are described as follows: Marble, fluorite, quartz, and calcined mica are added to the coating as gasifiers and slag-forming agents, mainly to protect the welding pool and improve the weld formation. Marble decomposes into CaO and CO2 under the action of arc heat, slag and gasification, which can increase the basicity of slag, stabilize the arc, refine the molten droplets, increase the interfacial tension between slag and metal, improve slag removal, and have good desulfurization ability; fluorite can slag, protect the welding pool and improve the weld formation; quartz is used to improve the molten droplet transition form during welding; calcined mica can enhance the plasticity of the electrode during the pressure coating process.

[0018] Titanium dioxide and rutile are added to the coating as arc stabilizers, making it easier for the electrode to strike an arc and keep the arc burning stably during welding. At the same time, titanium dioxide can enhance the plasticity, lubricity and fluidity of the electrode during the pressure coating process; rutile can adjust the melting point, viscosity, surface tension and fluidity of the slag, improve the weld formation and reduce spatter.

[0019] Sodium alginate, microcrystalline cellulose and soda ash are added to the coating as pressure-coating lubricants, mainly to improve the pressure-coating properties of the welding rod.

[0020] Titanium iron is added to the coating as a deoxidizer. Through metallurgical reactions during welding, it reduces the oxygen content in the weld metal and improves the properties of the weld metal. It also has the functions of stabilizing the welding arc, transferring trace Ti, refining grains, and improving the toughness of the weld metal.

[0021] Electrolytic manganese, niobium powder, metallic chromium and ferromolybdenum are added to the coating as alloying agents. Electrolytic manganese can desulfurize and deoxidize, and can also transfer manganese elements to the weld to improve weld strength; niobium powder transfers niobium elements to the weld to improve the strength, plasticity and heat and corrosion resistance of the weld metal; metallic chromium transfers chromium elements; ferromolybdenum transfers molybdenum elements to improve the heat and corrosion resistance of the weld metal.

[0022] According to any embodiment of the present invention, the welding core used to prepare the welding rod is a typical welding wire.

[0023] The nickel-based alloy welding rod with high temperature resistance and intergranular corrosion resistance according to the present invention has the following significant advantages: 1. The arc blowing force is soft, stable and less spatter during welding. 2. The weld slag is completely covered, the slag is well removed, and the weld is well formed. 3. The welding rod coating has good high current resistance. 4. The weld metal has excellent high temperature resistance and intergranular corrosion resistance. DETAILED DESCRIPTION

[0024] The present invention can be further described by the following examples, however, the scope of the present invention is not limited to the following examples. It will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. The present invention provides general and / or specific descriptions of the materials and test methods used in the test. Although many materials and operating methods used to achieve the purpose of the present invention are well known in the art, the present invention is still described in as much detail as possible at this point.

[0025] Example 1: Preparation of a nickel-based alloy welding rod resistant to high temperature and intergranular corrosion (a) taking 26 parts of marble, 20 parts of fluorite, 8 parts of quartz, 2 parts of titanium dioxide, 6 parts of rutile, 2 parts of calcined mica, 3 parts of sodium alginate, 3 parts of microcrystalline cellulose, 1 part of soda ash, 1 part of ferrotitanium, 6 parts of electrolytic manganese, 8 parts of niobium powder, 10 parts of metallic chromium, and 2 parts of ferromolybdenum, and mixing the powders of the materials uniformly; (b) taking 27 parts by weight of potassium sodium water glass per 100 parts by weight of the mixed powder of step (a), adding the mixed powder to the dry powder, and applying the mixed powder to a Φ2.5 mm welding core (ERNiCrFe-7) by a hydraulic press, and drying the welding rod at low temperature for 12 hours, and then drying the welding rod at high temperature to obtain a nickel-based alloy welding rod resistant to high temperature and intergranular corrosion, which is designated as ENiCrFe-7.

[0026] The high temperature resistant and intergranular corrosion resistant nickel-based alloy electrode ENiCrFe-7 obtained in this embodiment is used to weld the carbon steel plate base material, and the welding current is 150-160A. Its welding process performance is excellent, for example: the arc blowing force is soft and stable during welding, with less spatter, the weld slag is completely covered, the slag is well removed, the weld is smooth and excellent, the electrode coating has excellent high current resistance, and the weld metal has excellent high temperature resistance and intergranular corrosion resistance. The welding process records of some embodiments of the present invention are shown in Table 1.

[0027] Table 1: Welding processability record

[0028] The above embodiments all have excellent operability, excellent weld formation, and the weld metal has good properties.

[0029] In addition, the composition of the weld metal meets the requirements of relevant standards. The room temperature mechanical properties of the weld metal are Rm=657Mpa, Rp0.2=454Mpa, A=41.8%, the high temperature mechanical properties of the weld metal at 350°C are Rm=517Mpa, Rp0.2=344Mpa, A=45.7%, and the bending performance and intergranular corrosion performance of the weld metal are qualified. Rm is the tensile strength, Rp0.2 is the yield strength, and A is the elongation.

[0030] In addition, the obtained weld metal was subjected to an intergranular corrosion sensitivity test according to the D method of "GB / T 15260-2016 Nickel-based alloy intergranular corrosion test method", i.e., the 65% nitric acid method. The weld metal specimens were prepared according to the requirements of the GB / T method, and the processed specimens were placed in a conical flask with a co-current condensation device, and a 65% nitric acid solution was added. The test solution was heated and kept in a slightly boiling state and the test was continued for 48 hours. The above test steps were repeated 5 times (i.e., 5 test cycles), and the intergranular corrosion rate test results of each test cycle were obtained by weighing, and the average corrosion rate of the five test cycles was calculated. The nickel-based alloy electrode obtained in each embodiment was welded to the carbon steel plate base material to prepare 3 weld metal specimens for testing, and the average corrosion rate of the 3 weld metal specimens was calculated. The intergranular corrosion rate test results of the weld metal specimens obtained by welding the nickel-based alloy electrode in some embodiments of the present invention are shown in Table 2. The main component of bentonite is montmorillonite. The montmorillonite content of bentonite used in Examples 4-6 of the present invention is 88.2%, 94.1% and 91.3% respectively, and all are produced in Renshou, Sichuan. The intergranular corrosion rate of weld metal samples generally expected in the art should be less than 0.275 mm / year. According to the results of the present invention, it is unexpectedly found that the intergranular corrosion rate of the weld metal sample obtained by adding bentonite to the nickel-based alloy welding rod is significantly lower, indicating that some nickel-based alloy welding rods prepared by the present invention have excellent performance.

[0031] Table 2: Test results of intergranular corrosion rate of weld metal (mm / year)

[0032] The inventors have also found in other experiments that adding an appropriate amount of microcrystalline cellulose to the ingredients helps to improve the room temperature and high temperature mechanical properties of the weld metal. Specifically, in additional experiments, 6 batches of nickel-based alloy electrodes were prepared with reference to Examples 1 to 6 of the present invention, except that microcrystalline cellulose was not added. The 6 electrodes were used to weld the carbon steel plate base material, respectively, with a welding current of 150 to 160A, and 6 weld metals were obtained. It was determined that the room temperature A values ​​of the 6 weld metals were all within the range of 31% to 33%. For example, when referring to Example 1 and Example 4 but without adding microcrystalline cellulose, the room temperature A values ​​of the obtained weld metals were 32.5% and 31.7% respectively; the 350°C high temperature A values ​​of the 6 weld metals were all within the range of 34% to 37%. For example, when referring to Example 1 and Example 4 but without adding microcrystalline cellulose, the room temperature A values ​​of the obtained weld metals were 34.2% and 35.7% respectively; when microcrystalline cellulose was not added, the two parameters Rm and Rp0.2 were not significantly affected.

[0033] Although it is believed that microcrystalline cellulose can be used as a combustion-supporting material, has excellent combustion-supporting properties and enhances the arc blowing force and the re-striking performance of the welding rod, this property has no technical relevance to the excellent effect of increasing the A value caused by its use in the welding rod of the present invention.

[0034] Example 2: Preparation of a nickel-based alloy welding rod resistant to high temperature and intergranular corrosion (a) taking, by weight, 30 parts of marble, 15 parts of fluorite, 2 parts of quartz, 8 parts of titanium dioxide, 2 parts of rutile, 8 parts of calcined mica, 0.5 parts of sodium alginate, 1 part of microcrystalline cellulose, 1.5 parts of soda ash, 5 parts of ferrotitanium, 18 parts of electrolytic manganese, 2 parts of niobium powder, 2 parts of metallic chromium, and 5 parts of ferromolybdenum, and mixing the powders of the materials uniformly; (b) taking 25 parts by weight of potassium sodium water glass per 100 parts by weight of the mixed powder of step (a), adding the mixed powder to the dry powder, and applying the mixed powder to a Φ3.2 mm welding core (ERNiCrFe-7) by a hydraulic press, and drying the welding rod at low temperature for 12 hours, and then drying the welding rod at high temperature to obtain a nickel-based alloy welding rod ENiCrFe-7 resistant to high temperature and intergranular corrosion.

[0035] The high temperature resistant and intergranular corrosion resistant nickel-based alloy electrode ENiCrFe-7 obtained in this embodiment is used to weld the carbon steel plate base material, and the welding current is 150-160 A. The welding process performance is excellent, for example: the arc blowing force is soft and stable during welding, with less spatter, the weld slag is completely covered, the slag is well removed, the weld is smooth and excellent, the electrode coating has excellent high current resistance, and the weld metal has excellent high temperature resistance and intergranular corrosion resistance.

[0036] In addition, the composition of the weld metal meets the requirements of relevant standards. The room temperature mechanical properties of the weld metal are Rm=652Mpa, Rp0.2=451Mpa, A=42.5%, the high temperature mechanical properties of the weld metal at 350°C are Rm=515Mpa, Rp0.2=355Mpa, A=44.7%, and the bending performance and intergranular corrosion performance of the weld metal are qualified.

[0037] Example 3: Preparation of a nickel-based alloy welding rod resistant to high temperature and intergranular corrosion (a) taking 20 parts of marble, 17 parts of fluorite, 5 parts of quartz, 5 parts of titanium dioxide, 10 parts of rutile, 5 parts of calcined mica, 1.5 parts of sodium alginate, 2 parts of microcrystalline cellulose, 1.2 parts of soda ash, 3 parts of ferrotitanium, 12 parts of electrolytic manganese, 5 parts of niobium powder, 5 parts of metallic chromium, and 8 parts of ferromolybdenum, and mixing the powders of the materials uniformly; (b) taking 22 parts by weight of potassium sodium water glass per 100 parts by weight of the mixed powder of step (a), adding the mixed powder to the dry powder, and applying the mixed powder to a Φ4.0 mm welding core (ERNiCrFe-7) by a hydraulic press, and drying the welding rod at low temperature for 12 hours, and then drying the welding rod at high temperature to obtain a nickel-based alloy welding rod ENiCrFe-7 resistant to high temperature and intergranular corrosion.

[0038] The high temperature resistant and intergranular corrosion resistant nickel-based alloy electrode ENiCrFe-7 obtained in this embodiment is used to weld the carbon steel plate base material, and the welding current is 150-160 A. The welding process performance is excellent, for example: the arc blowing force is soft and stable during welding, with less spatter, the weld slag is completely covered, the slag is well removed, the weld is smooth and excellent, the electrode coating has excellent high current resistance, and the weld metal has excellent high temperature resistance and intergranular corrosion resistance.

[0039] In addition, the composition of the weld metal meets the requirements of relevant standards. The room temperature mechanical properties of the weld metal are Rm=655Mpa, Rp0.2=452Mpa, A=41.3%, the high temperature mechanical properties of the weld metal at 350°C are Rm=512Mpa, Rp0.2=347Mpa, A=46.4%, and the bending performance and intergranular corrosion performance of the weld metal are qualified.

[0040] Example 4: Preparation of a nickel-based alloy welding rod resistant to high temperature and intergranular corrosion (a) taking 26 parts of marble, 20 parts of fluorite, 8 parts of quartz, 2 parts of titanium dioxide, 6 parts of rutile, 2 parts of calcined mica, 3 parts of sodium alginate, 3 parts of microcrystalline cellulose, 5 parts of bentonite, 1 part of soda ash, 1 part of ferrotitanium, 6 parts of electrolytic manganese, 8 parts of niobium powder, 10 parts of metallic chromium, and 2 parts of ferromolybdenum, and mixing the powders of the materials uniformly; (b) taking 27 parts by weight of potassium sodium water glass per 100 parts by weight of the mixed powder of step (a), adding the mixed powder to the dry powder, and applying the mixed powder to a Φ2.5 mm welding core (ERNiCrFe-7) by a hydraulic press, and drying the welding rod at low temperature for 12 hours, and then drying the welding rod at high temperature to obtain a nickel-based alloy welding rod ENiCrFe-7 resistant to high temperature and intergranular corrosion.

[0041] The high temperature resistant and intergranular corrosion resistant nickel-based alloy electrode ENiCrFe-7 obtained in this embodiment is used to weld the carbon steel plate base material, and the welding current is 150-160 A. The welding process performance is excellent, for example: the arc blowing force is soft and stable during welding, with less spatter, the weld slag is completely covered, the slag is well removed, the weld is smooth and excellent, the electrode coating has excellent high current resistance, and the weld metal has excellent high temperature resistance and intergranular corrosion resistance.

[0042] In addition, the composition of the weld metal meets the requirements of relevant standards. The room temperature mechanical properties of the weld metal are Rm=664Mpa, Rp0.2=462Mpa, A=42.6%, the high temperature mechanical properties of the weld metal at 350°C are Rm=524Mpa, Rp0.2=363Mpa, A=45.3%, and the bending performance and intergranular corrosion performance of the weld metal are qualified.

[0043] Example 5: Preparation of a nickel-based alloy welding rod resistant to high temperature and intergranular corrosion (a) taking, by weight, 30 parts of marble, 15 parts of fluorite, 2 parts of quartz, 8 parts of titanium dioxide, 2 parts of rutile, 8 parts of calcined mica, 0.5 parts of sodium alginate, 1 part of microcrystalline cellulose, 3 parts of bentonite, 1.5 parts of soda ash, 5 parts of ferrotitanium, 18 parts of electrolytic manganese, 2 parts of niobium powder, 2 parts of metallic chromium, and 5 parts of ferromolybdenum, and mixing the powders of the materials uniformly; (b) taking 25 parts by weight of potassium sodium water glass per 100 parts by weight of the mixed powder of step (a), adding the mixed powder to the dry powder, and applying the mixed powder to a Φ3.2 mm welding core (ERNiCrFe-7) by a hydraulic press, and drying the welding rod at low temperature for 12 hours, and then drying the welding rod at high temperature to obtain a nickel-based alloy welding rod ENiCrFe-7 resistant to high temperature and intergranular corrosion.

[0044] The high temperature resistant and intergranular corrosion resistant nickel-based alloy electrode ENiCrFe-7 obtained in this embodiment is used to weld the carbon steel plate base material, and the welding current is 150-160 A. The welding process performance is excellent, for example: the arc blowing force is soft and stable during welding, with less spatter, the weld slag is completely covered, the slag is well removed, the weld is smooth and excellent, the electrode coating has excellent high current resistance, and the weld metal has excellent high temperature resistance and intergranular corrosion resistance.

[0045] In addition, the composition of the weld metal meets the requirements of relevant standards. The room temperature mechanical properties of the weld metal are Rm=642Mpa, Rp0.2=443Mpa, A=43.2%, the high temperature mechanical properties of the weld metal at 350°C are Rm=517Mpa, Rp0.2=358Mpa, A=46.8%, and the bending performance and intergranular corrosion performance of the weld metal are qualified.

[0046] Example 6: Preparation of a nickel-based alloy welding rod resistant to high temperature and intergranular corrosion (a) taking 20 parts of marble, 17 parts of fluorite, 5 parts of quartz, 5 parts of titanium dioxide, 10 parts of rutile, 5 parts of calcined mica, 1.5 parts of sodium alginate, 2 parts of microcrystalline cellulose, 4 parts of bentonite, 1.2 parts of soda ash, 3 parts of ferrotitanium, 12 parts of electrolytic manganese, 5 parts of niobium powder, 5 parts of metallic chromium, and 8 parts of ferromolybdenum, and mixing the powders of the materials uniformly; (b) taking 22 parts by weight of potassium sodium water glass per 100 parts by weight of the mixed powder of step (a), adding the mixed powder to the dry powder, and applying the mixed powder to a Φ4.0 mm welding core (ERNiCrFe-7) by a hydraulic press, and drying the welding rod at low temperature for 12 hours, and then drying the welding rod at high temperature to obtain a nickel-based alloy welding rod ENiCrFe-7 resistant to high temperature and intergranular corrosion.

[0047] The high temperature resistant and intergranular corrosion resistant nickel-based alloy electrode ENiCrFe-7 obtained in this embodiment is used to weld the carbon steel plate base material, and the welding current is 150-160 A. The welding process performance is excellent, for example: the arc blowing force is soft and stable during welding, with less spatter, the weld slag is completely covered, the slag is well removed, the weld is smooth and excellent, the electrode coating has excellent high current resistance, and the weld metal has excellent high temperature resistance and intergranular corrosion resistance.

[0048] In addition, the composition of the weld metal meets the requirements of relevant standards. The room temperature mechanical properties of the weld metal are Rm=638Mpa, Rp0.2=457Mpa, A=40.6%, the high temperature mechanical properties of the weld metal at 350°C are Rm=523Mpa, Rp0.2=342Mpa, A=45.2%, and the bending performance and intergranular corrosion performance of the weld metal are qualified.

[0049] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A nickel-based alloy welding rod resistant to high temperature and intergranular corrosion, characterized in that: The invention is prepared by uniformly mixing powders in the following weight proportions, adding potassium sodium water glass accounting for 22-27% of the total weight of the mixed powders, uniformly stirring, pressing and coating on a nickel-based alloy welding core, and then drying; the weight proportions of the powders are: 20-30 parts of marble, 15-20 parts of fluorite, 2-8 parts of quartz, 2-8 parts of titanium dioxide, 2-10 parts of rutile, 2-8 parts of calcined mica, 0.5-3 parts of sodium alginate, 1-3 parts of microcrystalline cellulose, 1-1.5 parts of soda ash, 1-5 parts of ferrotitanium, 6-18 parts of electrolytic manganese, 2-8 parts of niobium powder, 2-10 parts of metallic chromium, and 2-8 parts of ferromolybdenum.

2. The nickel-based alloy welding rod according to claim 1, characterized in that: The specification of the nickel-based alloy welding core is Φ2~5mm.

3. The nickel-based alloy welding rod according to claim 1, characterized in that: The nickel-based alloy welding core is an ERNiCrFe-7 welding core.

4. The nickel-based alloy welding rod according to claim 1, characterized in that: The drying process is to dry at low temperature for 12 hours and then dry at high temperature.

5. The nickel-based alloy welding rod according to claim 1, characterized in that: The specification of the nickel-based alloy welding core is Φ2.5~4.0mm.

6. The nickel-based alloy welding rod according to claim 1, characterized in that: The specification of the nickel-based alloy welding core is Φ2.5mm.

7. The nickel-based alloy welding rod according to claim 1, characterized in that: The specification of the nickel-based alloy welding core is Φ3.2mm.

8. The nickel-based alloy welding rod according to claim 1, characterized in that: The specification of the nickel-based alloy welding core is Φ4.0mm.

9. The nickel-based alloy welding rod according to claim 1, characterized in that: The weight ratio of the powder is: 26 parts of marble, 20 parts of fluorite, 8 parts of quartz, 2 parts of titanium dioxide, 6 parts of rutile, 2 parts of calcined mica, 3 parts of sodium alginate, 3 parts of microcrystalline cellulose, 1 part of soda ash, 1 part of ferrotitanium, 6 parts of electrolytic manganese, 8 parts of niobium powder, 10 parts of metallic chromium, and 2 parts of ferromolybdenum.

10. The nickel-based alloy welding rod according to claim 1, characterized in that: The weight ratio of the powder is: 30 parts of marble, 15 parts of fluorite, 2 parts of quartz, 8 parts of titanium dioxide, 2 parts of rutile, 8 parts of calcined mica, 0.5 parts of sodium alginate, 1 part of microcrystalline cellulose, 1.5 parts of soda ash, 5 parts of ferrotitanium, 18 parts of electrolytic manganese, 2 parts of niobium powder, 2 parts of metallic chromium, and 5 parts of ferromolybdenum; or, the weight ratio of the powder is: 20 parts of marble, 17 parts of fluorite, 5 parts of quartz, 5 parts of titanium dioxide, 10 parts of rutile, 5 parts of calcined mica, 1.5 parts of sodium alginate, 2 parts of microcrystalline cellulose, 1.2 parts of soda ash, 3 parts of ferrotitanium, 12 parts of electrolytic manganese, 5 parts of niobium powder, 5 parts of metallic chromium, and 8 parts of ferromolybdenum; or, based on 20-30 parts of marble, the powder further contains 3-5 parts of bentonite; or, the powder has the weight ratio of the powder as described in each embodiment.

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