An acid electrode for high current resistance

Abstract

The application provides an acid electrode for resisting large current, which comprises an electrode core and a coating covering the electrode core, and the coating comprises the following components: 45-65% of reduced ilmenite, 7.5-12.5% of potassium feldspar, 2.2-3.5% of white clay, 2.2-3.5% of mica, 3.7-6.2% of fine mica, 3-5% of palygorskite, 6-10% of medium-carbon ferromanganese, 3.7-6.2% of marble, 2.2-3.7% of organic matter and 3-5% of sepiolite. The acid electrode for resisting large current increases the ability of resisting large current by adding palygorskite-sepiolite type hydrous aluminosilicate.

Description

Technical Field

[0001] This invention belongs to the field of welding electrodes, and in particular relates to an acidic welding electrode for high current resistance. Background Technology

[0002] Ordinary high-current acidic welding electrodes are among the most widely used welding materials in China, accounting for a huge proportion. When using these electrodes, welders often adjust the welding current to a very high level to increase work efficiency. This results in a large amount of alloy being oxidized and burned off without being transferred to the deposited metal, causing the weld strength to fail to meet technical requirements and creating certain safety hazards. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes an acidic welding electrode resistant to high current.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] An acid-resistant welding electrode for high current applications, comprising a core and a coating encasing the core, the coating comprising the following components:

[0006] Reduced ilmenite 45-65%, potassium feldspar 7.5-12.5%, white clay 2.2-3.5%, mica 2.2-3.5%, fine mica 3.7-6.2%, palygorskite 3-5%, medium carbon manganese iron 6-10%, marble 3.7-6.2%, organic matter 2.2-3.7%, sepiolite 3-5%.

[0007] Furthermore, the organic matter mentioned refers to at least one of wood flour, bamboo flour, starch, or microcrystalline cellulose.

[0008] Preferably, the coating comprises the following components: 46-63% reduced ilmenite, 8.5-11.5% potassium feldspar, 2.5-3.4% bleach, 2.5-3.4% mica, 4.2-5.7% fine mica, 3.4-4.6% palygorskite, 6.8-9.2% medium-carbon manganese iron, 4.2-5.7% marble, 2.5-3.4% organic matter, and 3.4-4.6% sepiolite.

[0009] Preferably, the coating comprises the following components: 60% reduced ilmenite, 8.5% potassium feldspar, 3.3% bleach, 2.6% mica, 4.5% fine mica, 3.5% palygorskite, 7% medium-carbon manganese iron, 4.5% marble, 2.6% organic matter, and 3.5% sepiolite.

[0010] Preferably, the coating comprises the following components: 52.7% reduced ilmenite, 11% potassium feldspar, 2.9% bleach, 3% mica, 5% fine mica, 4.5% palygorskite, 8% medium-carbon manganese iron, 5% marble, 3.4% organic matter, and 4.5% sepiolite.

[0011] Preferably, the coating comprises the following components: 56% reduced ilmenite, 10% potassium feldspar, 3.1% bleach, 3.1% mica, 5% fine mica, 4% palygorskite, 7% medium-carbon manganese iron, 5.4% marble, 2.9% organic matter, and 3.5% sepiolite.

[0012] Preferably, the coating comprises the following components: 50% reduced ilmenite, 11.5% potassium feldspar, 3.4% bleaching clay, 3.2% mica, 5.5% fine mica, 4.5% palygorskite, 8.5% medium-carbon manganese iron, 5.5% marble, 3.4% organic matter, and 4.5% sepiolite.

[0013] The preparation method of the acidic welding electrode for high current resistance includes the following steps: mixing the components evenly, adding a binder, stirring evenly and then coating it evenly on the welding core, grinding out the clamping end and the arc-starting end, and then drying it in a welding electrode drying oven at low temperature 45-90℃, medium temperature 90-130℃, and high temperature 130-160℃ to obtain the acidic welding electrode for high current resistance.

[0014] Furthermore, when using spiral welding electrode production equipment, the binder is a potassium-sodium mixed water glass with a modulus of 2.3-2.8, a potassium-sodium ratio of 2.5-4:1, and a concentration of 37-40° Baume. The added mass of the binder is 18-25% of the sum of the components of the coating.

[0015] Furthermore, when using hydraulic welding electrode production equipment, the binder is a potassium-sodium mixed water glass with a modulus of 3.00-3.15, a potassium-sodium ratio of 2.5-3.6:1, and a concentration of 40-45° Baume. The added mass of the binder is 16-23% of the sum of the components of the coating.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The acidic welding electrode for high current resistance described in this invention increases the electrode's ability to withstand high current by adding hydrous aluminum magnesium silicate of palygorskite-sepiolite type.

[0018] The acidic welding electrode for high current resistance described in this invention can withstand large welding currents without the electrode tip turning red or the coating failing. Its mechanical properties and chemical composition under high current significantly exceed those of existing commercially available welding electrodes, thus ensuring weld quality, improving welding efficiency, and enhancing the economic benefits of enterprises.

[0019] The Charpy V-notch impact absorption energy (KV2) of the weld metal of the acidic welding electrode for high current resistance described in this invention has a low-temperature (-20℃) impact toughness value that is 70% higher than the Level 3 (greater than 47J at -20℃) index of the authoritative international classification society certification body, which significantly improves the crack resistance of the weld.

[0020] The acidic welding electrode for high current resistance described in this invention can be manufactured using the industry-standard spiral or hydraulic production equipment manufacturing process; the electrode has excellent welding process performance, mechanical properties and production coating performance, and can be used for both AC and DC. Detailed Implementation

[0021] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; and the experimental methods described are conventional methods.

[0022] The present invention will be described in detail below with reference to the embodiments.

[0023] Example 1

[0024] An acidic welding electrode for high current resistance, comprising a core and a coating covering the core, wherein the coating comprises the following components: 60% reduced ilmenite, 8.5% potassium feldspar, 3.3% bleaching clay, 2.6% mica, 4.5% fine mica, 3.5% palygorskite, 7% medium-carbon ferromanganese, 4.5% marble, 2.6% organic matter, and 3.5% sepiolite.

[0025] The preparation method of the acidic welding electrode for high current resistance includes the following steps: Mixing the components evenly; when using a spiral welding electrode production equipment, using a potassium-sodium mixed water glass with a modulus of 2.3-2.8, a potassium-sodium ratio of 2.5-4:1, and a concentration of 37-40° Baume degree as a binder, adding 18-25% of the weight of the mixed powder; after stirring evenly, uniformly coating the mixture onto H08A or H08E welding cores of different diameters using a spiral welding electrode production equipment; when using a hydraulic welding electrode production equipment, using a modulus of 3.00-... 3.15. A potassium-sodium mixed water glass with a potassium-sodium ratio of 2.5-3.6:1 and a concentration of 40-45° Baume is used as a binder. The amount added is 16-23% of the weight of the mixed powder. After stirring evenly, it is uniformly coated on H08A or H08E welding cores of different diameters using a hydraulic welding electrode production equipment. After grinding out the clamping end and the arc-starting end, it is dried in a welding electrode drying oven at low temperature (45-90°C), medium temperature (90-130°C), and high temperature (130-160°C) to prepare the acidic welding electrode for high current resistance of the present invention.

[0026] Example 2

[0027] An acidic welding electrode for high current resistance, comprising a core and a coating covering the core, wherein the coating comprises the following components: 52.7% reduced ilmenite, 11% potassium feldspar, 2.9% bleach, 3% mica, 5% fine mica, 4.5% palygorskite, 8% medium-carbon ferromanganese, 5% marble, 3.4% organic matter, and 4.5% sepiolite.

[0028] The preparation method of the acidic welding electrode for high current resistance includes the following steps: Mixing the components evenly; when using a spiral welding electrode production equipment, using a potassium-sodium mixed water glass with a modulus of 2.3-2.8, a potassium-sodium ratio of 2.5-4:1, and a concentration of 37-40° Baume degree as a binder, adding 18-25% of the weight of the mixed powder; after stirring evenly, uniformly coating the mixture onto H08A or H08E welding cores of different diameters using a spiral welding electrode production equipment; when using a hydraulic welding electrode production equipment, using a modulus of 3.00-... 3.15. A potassium-sodium mixed water glass with a potassium-sodium ratio of 2.5-3.6:1 and a concentration of 40-45° Baume is used as a binder. The amount added is 16-23% of the weight of the mixed powder. After stirring evenly, it is uniformly coated on H08A or H08E welding cores of different diameters using a hydraulic welding electrode production equipment. After grinding out the clamping end and the arc-starting end, it is dried in a welding electrode drying oven at low temperature (45-90°C), medium temperature (90-130°C), and high temperature (130-160°C) to prepare the acidic welding electrode for high current resistance of the present invention.

[0029] Example 3

[0030] An acidic welding electrode for high current resistance, comprising a core and a coating covering the core, wherein the coating comprises the following components: 56% reduced ilmenite, 10% potassium feldspar, 3.1% bleach, 3.1% mica, 5% fine mica, 4% palygorskite, 7% medium-carbon ferromanganese, 5.4% marble, 2.9% organic matter, and 3.5% sepiolite.

[0031] The preparation method of the acidic welding electrode for high current resistance includes the following steps: Mixing the components evenly; when using a spiral welding electrode production equipment, using a potassium-sodium mixed water glass with a modulus of 2.3-2.8, a potassium-sodium ratio of 2.5-4:1, and a concentration of 37-40° Baume degree as a binder, adding 18-25% of the weight of the mixed powder; after stirring evenly, uniformly coating the mixture onto H08A or H08E welding cores of different diameters using a spiral welding electrode production equipment; when using a hydraulic welding electrode production equipment, using a modulus of 3.00-... 3.15. A potassium-sodium mixed water glass with a potassium-sodium ratio of 2.5-3.6:1 and a concentration of 40-45° Baume is used as a binder. The amount added is 16-23% of the weight of the mixed powder. After stirring evenly, it is uniformly coated on H08A or H08E welding cores of different diameters using a hydraulic welding electrode production equipment. After grinding out the clamping end and the arc-starting end, it is dried in a welding electrode drying oven at low temperature (45-90°C), medium temperature (90-130°C), and high temperature (130-160°C) to prepare the acidic welding electrode for high current resistance of the present invention.

[0032] Example 4

[0033] An acidic welding electrode for high current resistance, comprising a core and a coating covering the core, wherein the coating comprises the following components: 50% reduced ilmenite, 11.5% potassium feldspar, 3.4% bleaching clay, 3.2% mica, 5.5% fine mica, 4.5% palygorskite, 8.5% medium-carbon ferromanganese, 5.5% marble, 3.4% organic matter, and 4.5% sepiolite.

[0034] The preparation method of the acidic welding electrode for high current resistance includes the following steps: Mixing the components evenly; when using a spiral welding electrode production equipment, using a potassium-sodium mixed water glass with a modulus of 2.3-2.8, a potassium-sodium ratio of 2.5-4:1, and a concentration of 37-40° Baume degree as a binder, adding 18-25% of the weight of the mixed powder; after stirring evenly, uniformly coating the mixture onto H08A or H08E welding cores of different diameters using a spiral welding electrode production equipment; when using a hydraulic welding electrode production equipment, using a modulus of 3.00-... 3.15. A potassium-sodium mixed water glass with a potassium-sodium ratio of 2.5-3.6:1 and a concentration of 40-45° Baume is used as a binder. The amount added is 16-23% of the weight of the mixed powder. After stirring evenly, it is uniformly coated on H08A or H08E welding cores of different diameters using a hydraulic welding electrode production equipment. After grinding out the clamping end and the arc-starting end, it is dried in a welding electrode drying oven at low temperature (45-90°C), medium temperature (90-130°C), and high temperature (130-160°C) to prepare the acidic welding electrode for high current resistance of the present invention.

[0035] The mechanical properties of the electrode deposited metal prepared in Examples 1-4 were tested using industry-standard methods, and the results are shown in Table 1.

[0036] Table 1 Mechanical properties of welded metal in the weld state (electrode specifications are as follows) Welding current 220A)

[0037]

[0038] The chemical composition results of the electrode deposited metal prepared in Examples 1-4, tested according to industry standard methods, are shown in Table 2.

[0039] Table 2 Chemical composition of deposited metal (weight percentage)

[0040] C S Mn P Si Example 1 0.08 0.016 0.33 0.020 0.15 Example 2 0.09 0.018 0.37 0.018 0.14 Example 3 0.07 0.019 0.35 0.021 0.15 Example 4 0.08 0.015 0.39 0.023 0.17 Commercially available welding electrodes 0.07 0.017 0.30 0.025 0.20

[0041] Based on the two sets of data above, it can be seen that when welding under the same high current, the present invention is superior to commercially available welding electrodes in terms of impact toughness and chemical composition of deposited metal.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An acidic welding electrode resistant to high current, characterized in that: The welding electrode comprises a core and a coating that covers the core, wherein the coating comprises the following components: Reduced ilmenite 60%, potassium feldspar 8.5%, white clay 3.3%, mica 2.6%, fine mica 4.5%, palygorskite 3.5%, medium-carbon manganese iron 7%, marble 4.5%, organic matter 2.6%, sepiolite 3.5%; The organic matter mentioned refers to at least one of wood flour, bamboo flour, starch, or microcrystalline cellulose.

2. The method for preparing the acidic welding electrode for high current resistance according to claim 1, characterized in that: The process includes the following steps: mixing all components evenly, adding a binder, stirring evenly and then coating the core evenly. After grinding out the clamping end and the arc-starting end, the core is dried in a welding electrode drying oven at low temperature (45-90℃), medium temperature (90-130℃), and high temperature (130-160℃) to obtain the acidic welding electrode for high current resistance.

3. The method for preparing acidic welding electrodes resistant to high current according to claim 2, characterized in that: When using spiral welding electrode production equipment, the binder is a potassium-sodium mixed water glass with a modulus of 2.3-2.8, a potassium-sodium ratio of 2.5-4:1, and a concentration of 37-40° Baume. The added mass of the binder is 18-25% of the sum of the components of the coating.

4. The method for preparing acidic welding electrodes resistant to high current according to claim 2, characterized in that: When using hydraulic welding electrode production equipment, the binder is a potassium-sodium mixed water glass with a modulus of 3.00-3.15, a potassium-sodium ratio of 2.5-3.6:1, and a concentration of 40-45° Baume. The added mass of the binder is 16-23% of the sum of the components of the coating.

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