A welding rod for a magnesium reduction tank and its preparation method

Abstract

The object of the present invention is to provide a welding electrode for a magnesium reduction tank and a preparation method thereof, which comprises a steel core and a welding flux. The welding flux is evenly distributed on the outer side of the steel core. Based on the total mass of the welding flux, the welding flux comprises raw materials in the following mass percentages: 30-40% of marble, 10-15% of fluorite, 5-10% of cryolite, 0.5-2% of rutile, 2-5% of ferrosilicon, 5-10% of manganese nitride, 2-5% of potassium feldspar, 1-3% of potassium titanate, 5-8% of ferrotitanium, 0.1-1% of ferromolybdenum, 0.1-1% of rare earth fluoride, 0.5-1% of soda ash, 0.1-1% of sodium carboxymethyl cellulose, and the balance is iron powder. The deposited metal formed by the welding electrode of the present invention can ensure that the welded joint has good high temperature resistance and corrosion resistance, thereby improving the service life of the reduction tank, and the welding electrode has good controllability and high welding efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of welding wires, and particularly to a welding rod for welding magnesium reduction pots and a preparation method thereof. Background Art

[0002] Most magnesium smelting processes adopt the Pidgeon process for production, that is, calcined dolomite, ferrosilicon and fluorite are ground into powder and made into pellets in a certain proportion, and the pellets are added into the reduction pot. The reduction pot is made of heat-resistant alloy steel. The temperature in the reduction pot is maintained at 1150°C - 1200°C, and the vacuum degree is about 10 Pa - 20 Pa. A reduction reaction occurs at high temperature, and the generated magnesium vapor flows to the cooling area with a crystallized water jacket and condenses into crystallized magnesium. During the smelting process, the reduction pot not only has to withstand high-temperature oxidation close to 1200°C, but also has to withstand the erosion of the high-temperature gas medium in the furnace. And once defects such as depressions and cracks occur in the weld of the reduction pot, the vacuum environment in the furnace will be damaged, resulting in the inability to carry out the reduction reaction, and the entire reduction pot will be scrapped, causing huge economic losses. Summary of the Invention

[0003] The purpose of the present invention is to provide a welding rod for welding magnesium reduction pots and a preparation method thereof. The deposited metal formed by this welding rod can ensure that the welded joint has good high-temperature resistance and corrosion resistance, thereby improving the service life of the reduction pot, and the welding rod has good controllability and high welding efficiency.

[0004] To meet the above technical purpose and its related technical purposes, the present invention provides a welding rod for welding magnesium reduction pots, which includes a steel core and a welding flux. The welding flux is evenly distributed outside the steel core. Based on the total mass of the welding flux, the welding flux includes raw materials with the following mass percentages: 30 - 40% of marble, 10 - 15% of fluorite, 5 - 10% of cryolite, 0.5 - 2% of rutile, 2 - 5% of ferrosilicon, 5 - 10% of nitrided manganese, 2 - 5% of potassium feldspar, 1 - 3% of potassium titanate, 5 - 8% of ferrotitanium, 0.1 - 1% of ferromolybdenum, 0.1 - 1% of rare earth fluoride, 0.5 - 1% of soda ash, 0.1 - 1% of sodium carboxymethyl cellulose, and the balance is iron powder.

[0005] In an example of the welding rod for welding magnesium reduction pots of the present invention, the steel core is a stainless steel core. Based on the total mass of the stainless steel core, the stainless steel core includes the following mass percentages of each component: C: ≤0.15%, Mn: 1.0 - 2.5%, Si: ≤0.65%, S: ≤0.03%, P: ≤0.03%, Cr: 28 - 32%, Ni: 8 - 10.5%, Mo: ≤0.75%, Cu: ≤0.75%, and the balance is Fe and some inevitable impurities.

[0006] In an example of the welding rod for welding magnesium reduction pots of the present invention, the addition amount of the marble is 35 - 40%.

[0007] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of fluorite is 12-15%.

[0008] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of cryolite is 6-9%.

[0009] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of rutile is 1-2%.

[0010] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of ferrosilicon is 3-4%.

[0011] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of manganese nitride is 6-9%.

[0012] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of potassium sodium feldspar is 3-4%.

[0013] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of potassium titanate is 1-2%.

[0014] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of ferromolybdenum is 0.5-1%.

[0015] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of rare earth fluoride is 0.5-1%.

[0016] In an example of the electrode for welding the magnesium reduction tank of the present invention, the addition amount of sodium carboxymethyl cellulose is 0.5-1%.

[0017] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of marble is 40-50 mesh.

[0018] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of fluorite is 40-50 mesh.

[0019] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of cryolite is 60-70 mesh.

[0020] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of rutile is 40-50 mesh.

[0021] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of ferrosilicon is 60-70 mesh.

[0022] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of manganese nitride is 70-80 mesh.

[0023] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of the potassium feldspar is 40 to 50 mesh.

[0024] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of the potassium titanate is 60 to 70 mesh.

[0025] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of the ferrotitanium is 60 to 70 mesh.

[0026] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of the ferromolybdenum is 60 to 70 mesh.

[0027] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of the rare earth fluoride is 70 to 80 mesh.

[0028] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of the soda ash is 60 to 70 mesh.

[0029] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of the sodium carboxymethyl cellulose is 60 to 70 mesh.

[0030] In an example of the electrode for welding the magnesium reduction tank of the present invention, the particle size of the iron powder is 40 to 50 mesh.

[0031] In an example of the electrode for welding the magnesium reduction tank of the present invention, based on the total mass of the electrode for welding the magnesium reduction tank, the mass percentage of the welding flux is 20 to 30%.

[0032] In an example of the electrode for welding the magnesium reduction tank of the present invention, the diameter of the electrode for welding the magnesium reduction tank is 2.5 to 5.0 mm.

[0033] The present invention also provides a preparation method of an electrode for welding a magnesium reduction tank, and the preparation steps include:

[0034] S1. Respectively screen and weigh each component of the welding flux and set aside for use;

[0035] S2. Add the powder of each component obtained in step S1 into a mixer, and add a water glass binder into the mixer, and then stir and mix evenly to obtain a mixed powder;

[0036] S3. Press and coat the mixed powder on a steel core through a press-coating machine, and dry it to obtain the electrode for welding the magnesium reduction tank.

[0037] In an example of the preparation method of the electrode for welding the magnesium reduction tank of the present invention, in step S2, the addition amount of the water glass binder is 21 to 24% of the total mass of the welding flux powder.

[0038] In an example of the preparation method of the electrode for welding the magnesium reduction tank of the present invention, in step S2, the stirring and mixing time of the mixer is 60 to 90 minutes.

[0039] In an example of the preparation method of the electrode for welding the magnesium reduction tank of the present invention, in step S3, the drying temperature of the drying is 350 to 370 °C, and the drying time is 2 to 4 hours.

[0040] The functions of the components in the flux-cored material of the present invention are as follows:

[0041] Marble: The main gas-forming agent and slag-forming agent, which decomposes into CO2 gas and CaO during welding to protect the molten pool and reduce the porosity sensitivity.

[0042] Fluorite: The main component is CaF2, which adjusts the melting point and viscosity of the slag, enhances the slag removal performance, and improves the weld formation.

[0043] Cryolite: The main component is sodium hexafluoroaluminate, which has a similar effect to fluorite and can adjust the fluidity of the slag.

[0044] Rutile: The main component is the acidic oxide TiO2, which adjusts the basicity of the slag, improves the slag removal property and arc stability.

[0045] Potassium and sodium feldspar: The main component is potassium and sodium aluminosilicate, which has the functions of stabilizing the arc and forming slag, and can also improve the pressing and coating property.

[0046] Potassium titanate: The main components are TiO2 and K2O, which have a similar effect to potassium and sodium feldspar and further improve the arc stability.

[0047] Rare earth fluoride: The main components are CeO2, La2O3, F, etc., which have the functions of deoxidation, desulfurization and dehydrogenation, and purify the weld.

[0048] Soda ash, sodium carboxymethyl cellulose: Can enhance the adhesion between the powder and improve the pressing and coating property of the electrode.

[0049] Ferrosilicon: The grade is SiFe75Al1.0-B, which is one of the deoxidizers. Transiting Si element to the weld is beneficial to improving the weld strength and heat resistance.

[0050] Manganese nitride: The grade is JMnN4, both N and Mn are austenite-forming elements. Appropriate N can improve the heat resistance of the weld metal, Mn is beneficial to improving the strength and toughness of the weld metal, and it also has a certain desulfurization ability.

[0051] Ferrotitanium: The grade is FeTi30-A, which is one of the deoxidizers and reduces the O content in the weld.

[0052] Ferromolybdenum: The grade is FeMo55-A, transiting Mo element to the weld, and Mo can significantly improve the high-temperature resistance of the weld.

[0053] In summary, the electrode for welding magnesium reduction pots and its preparation method according to the present invention adopt a Cr-Ni-Mo-Mn-Si alloy system, enabling the weld seam to have good high-temperature resistance and corrosion resistance. A variety of fluorides such as fluorite, cryolite, and rare earth fluoride are used for dehydrogenation, reducing the solidification rate of the molten pool and facilitating the discharge of gas from the molten pool. Rare earth elements can purify the weld seam structure. When combined in a certain ratio, it can effectively reduce the porosity sensitivity and crack sensitivity of the deposited metal; an appropriate amount of rutile, potassium feldspar, and potassium titanate are added to improve slag detachment performance. At the same time, K and Na elements can make the welding arc more stable and reduce spatter; the nitrogen element in manganese nitride, as a solid solution strengthening element, can further improve the strength and corrosion resistance of the weld metal, and a certain amount of manganese element can also reduce the harm of sulfur; an appropriate amount of soda ash and sodium carboxymethyl cellulose are added to adjust the ratio of the water glass binder, improving the strength of the welding flux coating and ensuring that the end of the welding flux does not crack during high-current welding, thereby improving the welding efficiency. Through the comprehensive action of the above various powders, the electrode has many advantages such as good arc stability, small spatter, beautiful formation, easy slag detachment, no cracking at the end during high-current welding, high welding efficiency, strong high-temperature resistance and corrosion resistance of the welded joint, effectively extending the service life of the magnesium reduction pot. Specific Embodiments

[0054] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present invention are for the purpose of describing specific specific implementation manners and are not intended to limit the protection scope of the present invention. The test methods without specific conditions noted in the following embodiments are usually carried out under conventional conditions or according to the conditions recommended by each manufacturer.

[0055] When the embodiments give a numerical range, it should be understood that unless otherwise specified in the present invention, any value at both ends of each numerical range and any value between the two ends can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention, based on the understanding of those skilled in the art of the prior art and the description of the present invention, can also use any methods, devices, and materials similar or equivalent to the methods, devices, and materials in the embodiments of the present invention to implement the present invention.

[0056] In addition, it should be noted that the material components not specifically described in the present invention are all selected from the conventional raw materials in the field of welding wire technology and can be obtained through general commercial channels. In the following examples, except for the explicitly given values, other undisclosed conditions are the same.

[0057] The following will be described with specific examples. In the following examples, the particle size of the marble is 40 mesh. The particle size of the fluorite is 40 mesh. The particle size of the cryolite is 60 mesh. The particle size of the rutile is 40 mesh. The particle size of the ferrosilicon is 60 mesh. The particle size of the manganese nitride is 80 mesh. The particle size of the potassium sodium feldspar is 40 mesh. The particle size of the potassium titanate is 60 mesh. The particle size of the ferrotitanium is 60 mesh. The particle size of the ferromolybdenum is 60 mesh. The particle size of the rare earth fluoride is 80 mesh. The particle size of the soda ash is 60 mesh. The particle size of the sodium carboxymethyl cellulose is 60 mesh. The particle size of the iron powder is 40 mesh.

[0058] The present invention provides a welding electrode for welding magnesium reduction tanks, which includes a steel core and a welding flux. The welding flux is evenly distributed outside the steel core. Based on the total mass of the welding flux, the welding flux includes the following raw materials in mass percentages: 30 - 40% of marble, 10 - 15% of fluorite, 5 - 10% of cryolite, 0.5 - 2% of rutile, 2 - 5% of ferrosilicon, 5 - 10% of manganese nitride, 2 - 5% of potassium sodium feldspar, 1 - 3% of potassium titanate, 5 - 8% of ferrotitanium, 0.1 - 1% of ferromolybdenum, 0.1 - 1% of rare earth fluoride, 0.5 - 1% of soda ash, 0.1 - 1% of sodium carboxymethyl cellulose, and the balance is iron powder.

[0059] In an example of the welding electrode for welding magnesium reduction tanks of the present invention, the steel core is a stainless steel core. Based on the total mass of the stainless steel core, the stainless steel core includes the following components in mass percentages: C: ≤0.15%, Mn: 1.0 - 2.5%, Si: ≤0.65%, S: ≤0.03%, P: ≤0.03%, Cr: 28 - 32%, Ni: 8 - 10.5%, Mo: ≤0.75%, Cu: ≤0.75%, and the balance is Fe and some inevitable impurities.

[0060] In an example of the welding electrode for welding magnesium reduction tanks of the present invention, based on the total mass of the welding electrode for welding magnesium reduction tanks, the mass percentage of the welding flux is 20 - 30%.

[0061] In an example of the welding electrode for welding magnesium reduction tanks of the present invention, the diameter of the welding electrode for welding magnesium reduction tanks is 2.5 - 5.0 mm.

[0062] The present invention also provides a preparation method of a welding electrode for welding magnesium reduction tanks, and its preparation steps include:

[0063] S1. Sieve and weigh each component of the welding flux for later use;

[0064] S2. Add the powder of each component obtained in step S1 into a blender, add sodium silicate binder into the blender, and then stir and mix evenly to obtain a mixed powder.

[0065] S3. Press and coat the mixed powder on a steel core through a press coater, and obtain the electrode for welding magnesium reduction tank after drying.

[0066] In an example of the preparation method of the electrode for welding magnesium reduction tank of the present invention, in step S2, the addition amount of the sodium silicate binder is 21-24% of the total mass of the welding flux powder.

[0067] In an example of the preparation method of the electrode for welding magnesium reduction tank of the present invention, in step S2, the stirring and mixing time of the blender is 60-90 min.

[0068] In an example of the preparation method of the electrode for welding magnesium reduction tank of the present invention, in step S3, the drying temperature for drying is 350-370 °C, and the drying time is 2-4 h.

[0069] The present invention adopts the Cr-Ni-Mo-Mn-Si alloy system to make the weld have good high-temperature resistance and corrosion resistance. A variety of fluorides such as fluorite, cryolite, and rare earth fluoride are used for dehydrogenation to reduce the solidification speed of the molten pool and facilitate the discharge of gas from the molten pool. Rare earth elements can purify the weld structure. Combined in a certain ratio, it can effectively reduce the porosity sensitivity and crack sensitivity of the deposited metal. Appropriate amounts of rutile, potassium feldspar, and potassium titanate are added to improve slag detachment performance. At the same time, K and Na elements can make the welding arc more stable and reduce spatter. The nitrogen element in manganese nitride is used as a solid solution strengthening element, which can improve the strength and corrosion resistance of the weld metal. A certain amount of manganese element can also reduce the harm of sulfur. Appropriate amounts of soda ash and sodium carboxymethyl cellulose are added to adjust the ratio of the sodium silicate binder, improve the strength of the welding flux coating, ensure that the end of the welding flux does not crack during high-current welding, and improve the welding efficiency.

[0070] Example 1

[0071] An electrode for welding magnesium reduction tank, which comprises a steel core and a welding flux. Based on the total mass of the welding flux, the welding flux comprises raw materials with the following mass percentages: 35% marble, 12% fluorite, 7% cryolite, 0.8% rutile, 2.4% ferrosilicon, 6.6% manganese nitride, 4.6% potassium feldspar, 2.6% potassium titanate, 6% ferrotitanium, 0.3% ferromolybdenum, 0.5% rare earth fluoride, 0.8% soda ash, 0.5% sodium carboxymethyl cellulose, and the balance is iron powder. The steel core is a stainless steel core.

[0072] The preparation steps of the electrode for welding magnesium reduction tank include:

[0073] S1. Sieve and weigh each component of the welding flux respectively for later use;

[0074] S2. Add the powder of each component obtained in step S1 into a blender, and add sodium silicate binder into the blender. The addition amount of the sodium silicate binder is 22% of the total mass of the welding flux powder. Then stir and mix for 60 min to obtain a mixed powder;

[0075] S3. Coat the mixed powder on the steel core through a press coater, and dry it at 360 °C for 2 h to obtain the welding rod for welding the magnesium reduction tank.

[0076] Among them, the welding flux accounts for 20% of the total mass of the welding rod for welding the magnesium reduction tank, and the diameter of the welding rod for welding the magnesium reduction tank is 2.5 mm.

[0077] Example 2

[0078] A welding rod for welding a magnesium reduction tank, which comprises a steel core and a welding flux. Based on the total mass of the welding flux, the welding flux comprises raw materials with the following mass percentages: 30% marble, 15% fluorite, 5.5% cryolite, 1.8% rutile, 4.5% ferrosilicon, 9.5% manganese nitride, 2.5% potassium sodium feldspar, 1.2% potassium titanate, 7.3% ferrotitanium, 0.6% ferromolybdenum, 0.8% rare earth fluoride, 0.5% soda ash, 0.2% sodium carboxymethyl cellulose, and the balance is iron powder. The steel core is a stainless steel core.

[0079] The preparation steps of the welding rod for welding the magnesium reduction tank include:

[0080] S1. Sieve and weigh each component of the welding flux respectively for later use;

[0081] S2. Add the powder of each component obtained in step S1 into a blender, and add sodium silicate binder into the blender. The addition amount of the sodium silicate binder is 23% of the total mass of the welding flux powder. Then stir and mix for 60 min to obtain a mixed powder;

[0082] S3. Coat the mixed powder on the steel core through a press coater, and dry it at 360 °C for 2 h to obtain the welding rod for welding the magnesium reduction tank.

[0083] Among them, the welding flux accounts for 25% of the total mass of the welding rod for welding the magnesium reduction tank, and the diameter of the welding rod for welding the magnesium reduction tank is 3.2 mm.

[0084] Example 3

[0085] A welding rod for magnesium reduction tank, which comprises a steel core and a welding flux. Based on the total mass of the welding flux, the welding flux comprises raw materials with the following mass percentages: 39% marble, 13% fluorite, 9.2% cryolite, 1.2% rutile, 3.5% ferrosilicon, 7.8% manganese nitride, 3.6% potassium feldspar, 2% potassium titanate, 5.2% ferrotitanium, 0.8% ferromolybdenum, 0.2% rare earth fluoride, 0.6% soda ash, 0.8% sodium carboxymethyl cellulose, and the balance is iron powder. The steel core is a stainless steel core.

[0086] The preparation steps of the welding rod for magnesium reduction tank include:

[0087] S1. Sieving and weighing each component of the welding flux respectively for later use;

[0088] S2. Adding the powder of each component obtained in step S1 into a mixer, and adding a sodium silicate binder to the mixer. The addition amount of the sodium silicate binder is 24% of the total mass of the welding flux powder, and then stirring and mixing for 60 min to obtain a mixed powder;

[0089] S3. Pressing and coating the mixed powder on the steel core through a coating machine, and drying at 360 °C for 2 h to obtain the welding rod for magnesium reduction tank.

[0090] Among them, the welding flux accounts for 20% of the total mass of the welding rod for magnesium reduction tank, and the diameter of the welding rod for magnesium reduction tank is 4.0 mm.

[0091] Example 4

[0092] A welding rod for magnesium reduction tank, which comprises a steel core and a welding flux. Based on the total mass of the welding flux, the welding flux comprises raw materials with the following mass percentages: 40% marble, 12% fluorite, 10% cryolite, 2% rutile, 5% ferrosilicon, 5% manganese nitride, 5% potassium feldspar, 3% potassium titanate, 5% ferrotitanium, 4% ferromolybdenum, 0.1% rare earth fluoride, 1% soda ash, 0.1% sodium carboxymethyl cellulose, and the balance is iron powder. The steel core is a stainless steel core.

[0093] The preparation steps of the welding rod for magnesium reduction tank include:

[0094] S1. Sieving and weighing each component of the welding flux respectively for later use;

[0095] S2. Adding the powder of each component obtained in step S1 into a mixer, and adding a sodium silicate binder to the mixer. The addition amount of the sodium silicate binder is 21% of the total mass of the welding flux powder, and then stirring and mixing for 90 min to obtain a mixed powder;

[0096] S3. Coat the mixed powder on the steel core through a coating machine, and obtain the electrode for welding the magnesium reduction tank after drying at 350°C for 4 hours.

[0097] Among them, the welding flux accounts for 30% of the total mass of the electrode for welding the magnesium reduction tank, and the diameter of the electrode for welding the magnesium reduction tank is 5.0 mm.

[0098] Example 5

[0099] An electrode for welding the magnesium reduction tank, which includes a steel core and a welding flux. Based on the total mass of the welding flux, the welding flux includes the following raw materials in mass percentages: 30% marble, 10% fluorite, 10% cryolite, 0.5% rutile, 4% ferrosilicon, 10% manganese nitride, 2% potassium sodium feldspar, 1% potassium titanate, 8% ferrotitanium, 0.5% ferromolybdenum, 1% rare earth fluoride, 0.5% soda ash, 0.2% sodium carboxymethyl cellulose, and the balance is iron powder. The steel core is a stainless steel core.

[0100] The preparation steps of the electrode for welding the magnesium reduction tank include:

[0101] S1. Sieve and weigh each component of the welding flux for later use;

[0102] S2. Add the powder of each component obtained in step S1 into a mixer, and add sodium silicate binder to the mixer. The addition amount of the sodium silicate binder is 22% of the total mass of the welding flux powder, and then stir and mix for 80 minutes to obtain a mixed powder;

[0103] S3. Coat the mixed powder on the steel core through a coating machine, and obtain the electrode for welding the magnesium reduction tank after drying at 370°C for 2 hours.

[0104] Among them, the welding flux accounts for 30% of the total mass of the electrode for welding the magnesium reduction tank, and the diameter of the electrode for welding the magnesium reduction tank is 5.0 mm.

[0105] Example 6

[0106] An electrode for welding the magnesium reduction tank, which includes a steel core and a welding flux. Based on the total mass of the welding flux, the welding flux includes the following raw materials in mass percentages: 35% marble, 12% fluorite, 7% cryolite, 0.8% rutile, 3% ferrosilicon, 6% manganese nitride, 4% potassium sodium feldspar, 2.5% potassium titanate, 6% ferrotitanium, 0.1% ferromolybdenum, 0.5% rare earth fluoride, 0.8% soda ash, 1% sodium carboxymethyl cellulose, and the balance is iron powder. The steel core is a stainless steel core.

[0107] The preparation steps of the electrode for welding the magnesium reduction tank include:

[0108] S1. Sieve and weigh each component of the welding flux for later use;

[0109] S2. Add the powder of each component obtained in step S1 into a blender, and add sodium silicate binder into the blender. The addition amount of the sodium silicate binder is 23% of the total mass of the welding flux powder. Then stir and mix for 60 min to obtain a mixed powder.

[0110] S3. Press and coat the mixed powder on a steel core through a press coater, and dry it at 360 °C for 2 h to obtain the electrode for welding the magnesium reduction tank.

[0111] Among them, the welding flux accounts for 25% of the total mass of the electrode for welding the magnesium reduction tank, and the diameter of the electrode for welding the magnesium reduction tank is 4.0 mm.

[0112] Use the electrodes for welding the magnesium reduction tank prepared in Examples 1 to 6 to conduct welding tests on the magnesium reduction tank. The parameters of the electric welding machine are: voltage 34 - 36 V, current 200 - 220 A. Test the welding process performance of the electrode, the mechanical properties of the deposited metal, and the service life of the magnesium reduction tank. The test results of the welding process performance of the electrode are shown in Table 1, and the test results of the mechanical properties of the deposited metal and the service life of the magnesium reduction tank are shown in Table 2.

[0113] Table 1 shows the test results of the welding process performance of the electrode

[0114] Test Items Arc Stability Slag Removal Property Spatter Tip Crack Forming Condition Example 1 Excellent Excellent Small None Good Example 2 Excellent Excellent Small None Good Example 3 Excellent Excellent Small None Good Example 4 Excellent Excellent Small None Good Example 5 Excellent Excellent Small None Good Example 6 Excellent Excellent Small None Good Ordinary Electrode General General Large Cracking Slight Undercut

[0115] It can be seen from the test results in Table 1 that the electrode for welding the magnesium reduction tank of the present invention has good arc stability, small spatter, beautiful shape, easy slag detachment, no crack at the end during high-current welding, high welding efficiency, and good welding effect.

[0116] Table 2 shows the test results of the mechanical properties of the deposited metal and the service life of the magnesium reduction tank

[0117]

[0118] It can be seen from the test results in Table 2 that the deposited metal formed by the electrode for welding the magnesium reduction tank of the present invention has high tensile strength, high temperature resistance, and corrosion resistance, and has good porosity resistance and crack resistance, and also has a high elongation rate. The service life of the magnesium reduction tank welded with the present invention is much higher than that of ordinary electrodes, indicating that the deposited metal formed by the electrode for welding the magnesium reduction tank of the present invention has advantages such as high temperature resistance and corrosion resistance.

[0119] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An electrode for welding a magnesium reduction tank, characterized in that, It includes a steel core and a welding flux. The welding flux is evenly distributed on the outer side of the steel core. Based on the total mass of the welding flux, the welding flux is composed of raw materials in the following mass percentages: 35 - 40% marble, 10 - 15% fluorite, 5 - 10% cryolite, 0.5 - 2% rutile, 2 - 5% ferrosilicon, 5 - 10% manganese nitride, 2 - 5% potassium sodium feldspar, 1 - 3% potassium titanate, 5 - 8% ferrotitanium, 0.1 - 1% ferromolybdenum, 0.1 - 1% rare earth fluoride, 0.5 - 1% soda ash, 0.1 - 1% sodium carboxymethyl cellulose, and the balance is iron powder; based on the total mass of the electrode for welding the magnesium reduction tank, the mass percentage of the welding flux is 20 - 30%.

2. The welding electrode for the magnesium reduction tank as described in claim 1 is characterized in that, The steel core is a stainless - steel core. Based on the total mass of the stainless - steel core, the stainless - steel core includes the following components in mass percentages: C: ≤0.15%, Mn: 1.0 - 2.5%, Si: ≤0.65%, S: ≤0.03%, P: ≤0.03%, Cr: 28 - 32%, Ni: 8 - 10.5%, Mo: ≤0.75%, Cu: ≤0.75%, and the balance is Fe and some inevitable impurities.

3. The welding electrode for the magnesium reduction tank as described in claim 1 is characterized in that, The addition amount of the fluorite is 12 - 15%.

4. The welding electrode for magnesium reduction tank as described in claim 1, characterized in that, The diameter of the electrode for welding the magnesium reduction tank is 2.5 - 5.0 mm.

5. A preparation method of a welding electrode for a magnesium reduction tank as described in any one of claims 1 to 4, characterized in that, The preparation steps include: S1. Sieving and weighing each component of the welding flux respectively for later use; S2. Adding the powder of each component obtained in step S1 into a mixer, and adding sodium silicate binder into the mixer, then stirring and mixing evenly to obtain a mixed powder; S3. Press - coating the mixed powder on the steel core through a press - coating machine, and drying to obtain the electrode for welding the magnesium reduction tank.

6. The preparation method of the welding rod for the magnesium reduction tank welding according to claim 5, characterized in that, In step S2, the addition amount of the sodium silicate binder is 21 - 24% of the total mass of the welding - flux powder.

7. The preparation method of the welding rod for the magnesium reduction tank as described in claim 5, characterized in that, In step S2, the stirring and mixing time of the mixer is 60 - 90 min.

8. The preparation method of the welding rod for the magnesium reduction tank welding according to claim 5, characterized in that, In step S3, the drying temperature for drying is 350 - 370 °C, and the drying time is 2 - 4 h.

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