A helix machine produces a surfacing electrode

Abstract

The application provides a surfacing electrode produced by a screw machine and a preparation method thereof, the electrode comprising an electrode core and a coating covering the surface of the electrode core, the weight of the coating being 48-52% of the weight of the electrode core; the coating comprises the following components in percentage by weight: marble 5.0%-8.0%, reduced ilmenite 20.0%-24.0%, rutile 8.0%-12.0%, white clay 3.0%-8.0%, mica 5.0%-8.0%, wood powder 2.0%-4.0%, starch 2.0%-3.0%, medium-carbon ferromanganese 8.0%-10.0%, high-carbon ferrochrome 20.0%-22.0%, ferromolybdenum 5.0%-9.0%, and green clay phyllite 7.0%-12.0%. The electrode is used for single-layer or multi-layer surfacing of various worn machine surfaces, has good Rockwell hardness, and can be used in alternating current and direct current.

Description

Technical Field

[0001] This invention relates to the field of welding materials, and in particular to a welding electrode for overlay welding produced by a screw press. Background Technology

[0002] With increasingly fierce competition in the welding materials industry in recent years, users have higher and higher requirements for product quality, while profit margins are shrinking. This necessitates continuous product improvement by manufacturers, aiming to optimize product quality while reducing costs and increasing efficiency. Therefore, it is essential not only to focus on product formulations but also to leverage increasingly advanced production equipment, changing production methods and process control to achieve the goals of improving product quality while simultaneously reducing costs and increasing efficiency. Summary of the Invention

[0003] In view of this, the present invention aims to provide a welding electrode for overlay welding produced by a screw press. This electrode is used for single-layer or multi-layer overlay welding of various worn machine parts, has good Rockwell hardness, and can be used for both AC and DC welding.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A welding electrode produced by a spiral mill includes a core and a flux coating on the surface of the core, wherein the flux coating accounts for 48-52% of the weight of the core. The coating comprises the following components by weight percentage: Marble: 5.0%-8.0%; Reduced ilmenite: 20.0%-24.0%; Rutile: 8.0%-12.0%; White clay: 3.0%-8.0%; Mica: 5.0%-8.0%; Wood flour: 2.0%-4.0%; Starch: 2.0%-3.0%; Medium-carbon ferromanganese: 8.0%-10.0%; High-carbon ferrochrome: 20.0%-22.0%; Ferromolybdenum: 5.0%-9.0%; Chlorite phyllite: 7.0%-12.0%; The preparation method of the welding electrode is as follows: After the components of the coating are mixed, they are transported through a negative pressure pipeline to a roller mixer for dry mixing. Then, water glass is added and mixed evenly according to the set mixing time. The mixed powder is then transported through a negative pressure pipeline to the feed hopper of a spiral coating machine for coating. The coated welding rod is continuously baked in a chain furnace, cooled, and then sent to an automatic packaging device for packaging and warehousing. The water glass is a potassium-sodium water glass with a modulus of 2.4-2.6, a concentration of 39-41.5°Bé, and a potassium-sodium ratio of 3-4:1, mixed with a potassium-sodium water glass with a modulus of 3.2-3.3, a concentration of 29-32°Bé, and a potassium-sodium ratio of 1:1 in a mass ratio of 3:1.

[0005] Furthermore, the marble is 60 mesh.

[0006] Furthermore, the TiO2 content in the rutile is 85%.

[0007] Furthermore, the welding core material is designated as H08A.

[0008] Furthermore, the coated welding rods are continuously baked in low-temperature, medium-temperature, and high-temperature chain ovens. The low-temperature baking temperature is 50℃-70℃, the medium-temperature baking temperature is 100℃-150℃, and the high-temperature baking temperature is 220℃-240℃.

[0009] Compared with existing technologies, the welding electrodes produced by the spiral mill described in this invention have the following advantages: The coating formula of the welding electrode produced by the spiral machine described in this invention incorporates an appropriate amount of chlorite phyllite and is used in conjunction with mixed water glass. This increases the moisture retention of the coating powder and gives it good fluidity. By controlling the formula cost and combining it with improved production technology and a reasonable process flow, the goal of controlling production costs can be achieved. Detailed Implementation

[0010] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0011] The present invention will now be described in detail with reference to embodiments.

[0012] Example Table 1. Composition table of welding electrodes for Examples 1-4 The method for preparing welding electrodes described in Examples 1-4 includes the following steps: Enter the production formula into the automatic powder mixing system in advance, select the formula, and start the program.

[0013] After the components of the coating are mixed, they are transported through a negative pressure pipeline to a roller-type mixer for dry mixing. The computer control system automatically weighs and adds water glass (pre-mixed in a specific ratio) according to the entered addition ratio (by weight percentage), and mixes it evenly according to the set mixing time. The mixed powder is then transported through a negative pressure pipeline to the feed hopper of a spiral coating machine for coating. The entire process is in a fully enclosed state, reducing the degree of dryness changes of the mixed powder during forklift transportation. After coating, the welding rods are continuously baked in low-temperature, medium-temperature, and high-temperature chain furnaces, and then cooled before being automatically packaged and stored, realizing automated production linkage control. This changes the traditional production process of forklift transportation of materials and personnel, reduces the need for personnel in the mixing process, and greatly reduces process production costs. Compared with the traditional manufacturing process, the production method designed here truly achieves one-button start and intelligent manufacturing.

[0014] Among them, potassium-sodium water glass with a modulus of 2.4-2.6, a concentration of 39-41.5°Bé, and a potassium-sodium ratio of 3-4:1 is mixed with potassium-sodium water glass with a modulus of 3.2-3.3, a concentration of 29-32°Bé, and a potassium-sodium ratio of 1:1 in a mass ratio of 3:1.

[0015] Specifically, the two types of water glass are potassium-sodium water glass with a modulus of 2.5, a concentration of 39°Bé, and a potassium-sodium ratio of 3:1, and potassium-sodium water glass with a modulus of 3.2, a concentration of 31.2°Bé, and a potassium-sodium ratio of 1:1.

[0016] The low-temperature baking temperature is 50℃, the medium-temperature baking temperature is 110℃, and the high-temperature baking temperature is 240℃.

[0017] The HRC hardness test results of the weld metal surface prepared in Examples 1-4, tested according to industry standard methods, are shown in Table 2.

[0018] Table 2 Surface hardness of deposited metal (weld overlay height 3 layers) The chemical composition test results of the weld metal deposited by the welding electrodes prepared in Examples 1-4, tested according to industry standard methods, are shown in Table 3.

[0019] Table 3 Chemical composition of deposited metal (by weight percentage) After hardness testing and chemical composition testing of the deposited metal, the present invention has met the target value requirements.

[0020] Comparative Example 1 The difference from Example 1 is that no chlorite phyllite is added.

[0021] During the stirring process, it can be seen that the "water absorption" of the powder decreases, the powder does not form a solid shape, and it is too soft. During the pressing process, the pressing is unstable and eccentric. After a period of pressing, the mold hole is blocked, the pressing head clumps obviously, and normal production cannot be achieved.

[0022] Comparative Example 2 The difference from Example 1 is that the amount of chlorite phyllite added is 5%.

[0023] During the mixing process, it can be seen that the powder is mixed normally and the dryness and wetness are good; during the pressing process, the pressing is unstable, especially after pressing for a period of time, there will still be eccentric instability and blockage of the mold, making it impossible to produce normally and continuously.

[0024] Comparative Example 3 The difference from Example 1 is that the amount of chlorite phyllite added is 13%.

[0025] During the mixing process, it can be seen that the powder is mixed normally and the dryness and wetness are good; the coating process is good, but the welding process of the finished welding rod deteriorates, with more spatter and poor weld formation.

[0026] Comparative Example 4 The difference from Example 1 is that only one type of water glass is used: potassium-sodium water glass with a modulus of 3.2, a concentration of 31.2°Bé, and a potassium-sodium ratio of 1:1.

[0027] During the mixing process, it can be seen that the powder is mixed normally, but it dries quickly and is prone to clumping. During the pressing process, the pressing is unstable, especially after a period of pressing, there will be eccentricity and blockage of the mold, making it impossible to produce normally and continuously.

[0028] 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. A welding electrode produced by a screw press, characterized in that: Includes the core wire and the flux coating covering the surface of the core wire, with the flux coating accounting for 48-52% of the core wire weight; The coating comprises the following components by weight percentage: Marble: 5.0%-8.0%; Reduced ilmenite: 20.0%-24.0%; Rutile: 8.0%-12.0%; White clay: 3.0%-8.0%; Mica: 5.0%-8.0%; Wood flour: 2.0%-4.0%; Starch: 2.0%-3.0%; Medium-carbon ferromanganese: 8.0%-10.0%; High-carbon ferrochrome: 20.0%-22.0%; Ferromolybdenum: 5.0%-9.0%; Chlorite phyllite: 7.0%-12.0%; The preparation method of the welding electrode is as follows: After the components of the coating are mixed, they are transported through a negative pressure pipeline to a roller mixer for dry mixing. Then water glass is added and mixed evenly according to the set mixing time. The mixed powder is then transported through a negative pressure pipeline to the feed hopper of a spiral coating machine for coating. After being coated, the welding rods are continuously baked in a chain furnace, cooled down, and then sent to an automatic packaging device for packaging and warehousing. The water glass is a potassium-sodium water glass with a modulus of 2.4-2.6, a concentration of 39-41.5°Bé, and a potassium-sodium ratio of 3-4:1, mixed with a potassium-sodium water glass with a modulus of 3.2-3.3, a concentration of 29-32°Bé, and a potassium-sodium ratio of 1:1 in a mass ratio of 3:

1.

2. The welding electrode produced by the screw press according to claim 1, characterized in that: The marble is 60 mesh.

3. The welding electrode produced by the screw press according to claim 1, characterized in that: The rutile contains 85% TiO2.

4. The welding electrode produced by the screw press according to claim 1, characterized in that: The welding core material is grade H08A.

5. The welding electrode produced by the screw press according to claim 1, characterized in that: After being coated, the welding rods are continuously baked in low-temperature, medium-temperature and high-temperature chain ovens. The low-temperature baking temperature is 50℃-70℃, the medium-temperature baking temperature is 100℃-150℃, and the high-temperature baking temperature is 220℃-240℃.

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