CN114850724A - High-alkaline sintered flux for submerged-arc welding of austenitic low-temperature steel and preparation method thereof - Google Patents
High-alkaline sintered flux for submerged-arc welding of austenitic low-temperature steel and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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Abstract
The invention provides a high-alkalinity sintered flux for submerged-arc welding of austenitic low-temperature steel and a preparation method thereof. The sintered flux comprises dry powder and a binder, wherein the dry powder comprises the following raw materials in parts by weight: 26-35% of fused magnesite, 24-29% of fluorite, 10-18% of wollastonite, 12-18% of alumina, 1-3% of ilmenite, 2-5% of electrolytic manganese metal, 1-2% of chromium metal, 0.1-0.6% of graphite, 0.1-1% of sodium carbonate, 0.1-1% of potassium carbonate, 0.1-0.5% of aluminum-magnesium alloy, 0.1-1% of sodium fluoroaluminate and 19-23% of binder by weight of dry powder. The alkalinity of a slag system is increased through reasonable optimization of the proportion of slagging components, so that the spreadability of a welding seam is good, and automatic deslagging can be realized in a flat plate and a groove; through micro-adjustment of alloy elements such as C, Mn, Cr and the like, the burning loss in a welding wire in the welding process is compensated, and the growth of crystal grains is effectively inhibited, so that the deposited components are ensured, and the comprehensive mechanical property of a welding line is improved. The high-temperature sintering temperature can be controlled below 600 ℃, the production cost and the sintering energy consumption are reduced, and the welding flux has the characteristics of low manufacturing cost and good comprehensive performance.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a high-alkalinity sintered flux for submerged-arc welding of austenitic low-temperature steel and a preparation method thereof.
Background
Liquefied Natural Gas (LNG) is used as a relatively clean and efficient fossil energy, the percentage of energy consumption in China increases year by year, and the consumption of domestic natural gas is estimated to break 6000 billion cubes by 2030 years, so that the industrial development is more and more emphasized. LNG temperatures as low as-162 ℃ require excellent cryogenic properties for the materials of construction of LNG ships and storage tanks. Materials conventionally used for the construction of LNG ships (storage tanks) are austenitic stainless steel, aluminum alloy, invar alloy, and 9Ni steel, of which 9Ni steel is used in the maximum amount. Because the 9Ni steel plate and the matched welding material contain high nickel content (about 9% of nickel content in the steel plate and more than 50% of nickel content in the welding material), the cost of the steel plate and the welding material is high, and at present, novel ultralow temperature materials are actively developed in many countries and regions to replace the traditional materials. The high-manganese ultralow-temperature steel has good low-temperature performance and cost far lower than that of 9Ni steel, so that the high-manganese ultralow-temperature steel has great potential. In view of the good application prospect of the high-manganese ultralow-temperature steel, the submerged-arc welding is indispensable as an efficient welding mode, and the research and development of the sintered flux matched with the submerged-arc welding wire of the high-manganese austenitic steel for the submerged-arc welding are very important.
CN111660038B discloses a sintered flux for welding high-manganese low-temperature steel and a preparation method thereof, wherein the sintered flux is a sinter obtained by mixing dry powder and a binder, and the dry powder comprises the following components in percentage by weight: 18-25% of alumina, 10-15% of mullite, 18-26% of magnesia, 15-25% of fluorite, 5-10% of quartz, 5-10% of wollastonite, 5-10% of nepheline, 1-3% of manganese-silicon alloy, 0.5% of sodium carbonate and 0.5% of sodium fluoride, wherein the addition amount of the binder is 21-24% of the weight of the dry powder. With this sintered flux, the tendency to segregation of components and hot cracking can be avoided. However, slag removal in the groove is difficult, part of key elements are seriously burnt, and high impurities of hydrogen and oxygen exist.
Disclosure of Invention
In view of the above, the invention aims to provide a high-alkaline sintered flux for submerged arc welding of austenitic low-temperature steel and a preparation method thereof, which have good weld spreadability, can realize automatic slag removal in a flat plate and a groove, can transit required or burnt alloy elements to a weld, and have low weld crack sensitivity.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a high-alkalinity sintered flux for submerged-arc welding of austenitic low-temperature steel, which comprises dry powder and a binder, wherein the dry powder comprises the following raw materials in parts by weight: 26-35% of fused magnesia, 24-29% of fluorite, 10-18% of wollastonite, 12-18% of alumina, 0.1-0.5% of aluminum-magnesium alloy, 0.1-1% of sodium fluoroaluminate, 0.1-1% of sodium carbonate, 0.1-1% of potassium carbonate and a supplement, wherein the addition amount of the binder is 19-23% of the weight of the dry powder. By reasonably optimizing the proportion of slagging components, the alkalinity of a slag system is increased, and the problems of difficult slag removal in a groove and serious surface oxidation of a welding seam in the welding process are solved.
The main component of the mineral fused magnesia in the sintered flux is MgO, the alkalinity of the slag can be improved by adding the component and controlling the dosage, the higher alkalinity is beneficial to reducing the content of impurity elements and improving the low-temperature toughness of deposited metal, meanwhile, the slag detachability is also influenced to a certain extent, and the mass part is controlled to be 26-35%.
The main component of fluorite in the sintered flux of the invention is CaF 2 By adding the components and controlling the dosage, the flux plays roles of slagging, dehydrogenation and fluxing agent in the flux, and can also improve the alkalinity of slag, improve the mechanical property of deposited metal, refine crystal grains and improve the impact absorption work. Has certain influence on the stability, slag detachability, spreadability and smoke quantity of the electric arc in the welding process, can not obtain proper melting point or melting temperature range when the content is too low or too high, can not obtain better protection for welding seams, is not favorable for forming,the mass portion is preferably controlled to be 24-29%.
Further, the wollastonite mainly comprises 46-55% of CaO and 43-50% of SiO 2 And minor amounts of impurities. The wollastonite in the welding flux can improve the granulation performance of the welding flux, adjust the viscosity and the fluidity of molten slag, facilitate short slag, does not contain structural water, reduces the phenomenon of air column indentation on the surface of a welding seam, and improves the welding process performance, and the mass fraction is controlled to be 10-18%.
The alumina in the sintered flux of the invention and the SiO in the wollastonite 2 The combined action of the components can reduce the surface tension of the molten slag, improve the interfacial tension, improve the slag detachability and avoid slag adhesion, and the weight part of the aluminum oxide is controlled to be 12-18%.
The aluminum-magnesium alloy in the sintered flux has extremely high activity, and an exothermic reaction occurs in the welding process, so that the adverse effect of high water content of the flux caused by low sintering temperature can be reduced.
The sodium fluoroaluminate in the sintered flux has the functions of the soldering flux and the reducing agent, can prevent oxidation reaction, reduces and removes an oxide film on the surface of a welding seam, and solves the problem of serious oxidation of the surface of the welding seam.
K produced by decomposition of sodium carbonate and potassium carbonate in the sintered flux of the present invention 2 O and Na 2 O belongs to an active component, and the problem of poor arc stability caused by the addition of a proper amount of reinforcing deoxidizing elements and alkaline oxides can be solved. Aiming at the problem of difficult deslagging in the prior art, the invention improves the problem of difficult deslagging by increasing the alkalinity, but the deoxidation is obvious after the alkalinity is increased, and the arc stability is poor, so the arc stability is improved by adding sodium carbonate and potassium carbonate.
Furthermore, the binder is sodium potassium silicate, the modulus is 2.9, the molar ratio of sodium to potassium is 1:3, and the baume degree is 38-45 DEG Be. The sodium-potassium water glass has less impurities and good transparency.
Further, the supplement agent comprises 1-3% of ilmenite, 2-5% of electrolytic manganese metal, 1-2% of metal chromium and 0.1-0.6% of graphite. Ilmenite, electrolytic manganese metal, chromium metal and graphite in the welding flux are mainly used for supplementing burning loss of carbon, manganese, chromium and titanium elements in the welding process, deposited metal components are guaranteed by adjusting the adding proportion, the problems that deposited metal and joint performance are poor due to burning loss of alloy components of the welding wire, welding seams are easy to generate and cracks in the welding process and the like are solved, good comprehensive mechanical properties are guaranteed, and a small amount of graphite is added to enable a small amount of carbon elements to be transited into the deposited metal, so that the strength of the deposited metal is improved. Wherein the weight portion of ilmenite is controlled to be 1-3%, electrolytic manganese metal is 2-5%, metal chromium is 1-2%, and graphite is 0.1-0.6%.
The invention also provides a preparation method of the high-alkalinity sintered flux for submerged-arc welding of the austenitic low-temperature steel, which comprises the following steps:
s1, weighing: weighing the dry powder and the binder according to the parts by weight, and putting the dry powder and the binder into a clean container for later use;
s2, dry mixing: sieving and mixing alumina and wollastonite in a container, then mixing the sieved mixture with other dry powder materials, pouring the mixture into a mixer, and stirring for 20-25 minutes to uniformly mix the dry powder;
s3, wet mixing: uniformly adding the binder into the uniformly mixed dry powder, and continuously stirring for 20-25 minutes by using a mixer;
s4, granulating: adding the wet mixed powder into a rotating roller, and obtaining welding flux particles through rotating friction forming of the roller;
s5, sieving: passing the formed flux particles through a 20-80-mesh sieve to obtain a semi-finished flux with target granularity;
s6, drying: drying the screened semi-finished flux;
s7, sieving: sieving the dried flux again, and crushing the flux agglomerated in the drying process to obtain uniform flux particles;
s8, sintering: and sintering the flux particles obtained in the step S7 to prepare the finished flux.
Furthermore, in step S4, the wet-mixed powder is intermittently, slightly and uniformly added to the rotating drum in batches, so as to obtain more shaped flux particles which are not easy to stick.
Further, in the step S6, the sieved semi-finished flux is dried at a low temperature of 300-350 ℃ for 55-65 minutes. And drying at the low temperature of 300-350 ℃ to remove the moisture attached to the surface of the semi-finished flux.
Further, in the step S8, the flux particles of the step S7 are sintered at 550 to 600 ℃ for 55 to 65 minutes, thereby further eliminating moisture in the flux particles.
Compared with the prior art, the high-alkaline sintered flux for submerged arc welding of austenitic low-temperature steel and the preparation method thereof have the following advantages:
(1) by reasonably optimizing the proportion of slagging components, the alkalinity of a slag system is increased, so that the spreadability of a welding seam is good, and automatic deslagging can be realized in a flat plate and a groove;
(2) alloy elements which are needed or burnt to be damaged can be transited to the welding seam, and the sensitivity of welding seam cracks is low;
(3) the high-temperature sintering temperature can be controlled below 600 ℃, and the production cost and the sintering energy consumption are reduced.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be noted at first that the data in the experimental examples described below are obtained by the inventors through a large number of experiments, limited to the space, only a part of which is shown in the specification, and those skilled in the art can understand and implement the present invention under the data. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. Furthermore, it should be understood that various changes or modifications to the invention may be made by those skilled in the art after reading the disclosure of the present invention, and these changes or modifications also fall within the scope of the protection of the present application. The parts ratio mentioned in the application refers to parts by weight unless otherwise specified.
The invention relates to a high-alkalinity sintered flux for submerged arc welding of austenitic low-temperature steel, which comprises dry powder and a binder, wherein the dry powder comprises the following raw materials in parts by weight: 26-35% of fused magnesia, 24-29% of fluorite, 10-18% of wollastonite, 12-18% of alumina, 0.1-0.5% of aluminum-magnesium alloy, 0.1-1% of sodium fluoroaluminate, a supplement and an activator, wherein the addition amount of the binder is 19-23% of the weight of the dry powder.
The binder is sodium-potassium water glass, the modulus is 2.9, the mole ratio of sodium to potassium is 1:3, and the Baume degree is 38-45 DEG Be. Preferably, the baume degree is 40 ° Be. The wollastonite mainly comprises 46-55% of CaO and 43-50% of SiO 2 。
Further, the alkaline sintered flux for submerged arc welding comprises dry powder and a binder, wherein the dry powder comprises the following raw materials in parts by weight: 26-35% of fused magnesite, 24-29% of fluorite, 10-18% of wollastonite, 12-18% of alumina, 1-3% of ilmenite, 2-5% of electrolytic manganese metal, 1-2% of chromium metal, 0.1-0.6% of graphite, 0.1-1% of sodium carbonate, 0.1-1% of potassium carbonate, 0.1-0.5% of aluminum-magnesium alloy and 0.1-1% of sodium fluoroaluminate, wherein the addition amount of the binder is 19-23% of the weight of the dry powder.
The preparation method of the alkaline sintered flux for submerged arc welding comprises the following steps:
s1, weighing: weighing the dry powder and the binder according to the parts by weight, and putting the dry powder and the binder into a clean container for later use;
s2, dry mixing: sieving and mixing alumina and wollastonite in a container, then mixing the sieved mixture with other dry powder materials, pouring the mixture into a mixer, and stirring for 20-25 minutes to uniformly mix the dry powder;
s3, wet mixing: uniformly adding the binder into the uniformly mixed dry powder, and continuously stirring for 20-25 minutes by using a mixer;
s4, granulation: adding the wet mixed powder into a rotating roller, and obtaining welding flux particles through rotating friction forming of the roller;
specifically, in step S4, the wet-mixed powder is intermittently, slightly, and uniformly fed in portions into a rotating drum, and flux particles are obtained by friction forming with the rotating drum. The number of batches is determined by the operator on the basis of the amount of wet-mixed powder and empirical values. The wet mixed powder is added into the roller intermittently, slightly and uniformly, so that more formed flux particles which are not easy to adhere can be obtained conveniently.
S5, sieving: passing the formed flux particles through a 20-80-mesh sieve to obtain a semi-finished flux with target granularity;
s6, drying: drying the screened semi-finished flux;
specifically, in step S6, the sieved semi-finished flux is dried at a low temperature of 300-350 ℃ for 55-65 minutes. And drying to remove the moisture attached to the surface of the semi-finished flux.
S7, sieving: sieving the dried flux again, and crushing the flux agglomerated in the drying process to obtain uniform flux particles;
s8, sintering: the flux particles of step S7 are sintered.
Specifically, in step S8, sintering the flux particles obtained in step S7 at 550-600 ℃ for 55-65 minutes; the moisture in the flux particles can be further removed by the step S8, and the obtained flux particles have a particle size of 20 to 80 mesh.
The formulations of the highly basic sintered fluxes for submerged arc welding of austenitic low-temperature steels in the following examples 1 to 10 are shown in Table 1, wherein the binders are wet-mixed and granulated with sodium potassium (K) 3:1 water glass having a modulus of 2.9 and Baume degree of 40 ℃ Be, and the amount of the binder added is 20% by weight of the dry powder. CaO and SiO in wollastonite used 2 The dosage ratio is about 1: 1. The preparation method of the basic sintered flux for submerged arc welding of examples 1-10 employs the following steps:
s1, weighing: weighing the corresponding dry powder and binder in the table 1 according to the parts by weight, and putting the dry powder and the binder into a clean container for later use;
s2, dry mixing: firstly, sieving the alumina and the wollastonite in a container by a 20-mesh sieve, mixing, then mixing with other dry powder materials, pouring the mixture into a mixer, and stirring for 20-25 minutes to uniformly mix the dry powder;
s3, wet mixing: uniformly adding the binder into the uniformly mixed dry powder, and continuously stirring for 20-25 minutes by using a mixer;
s4, granulation: adding the wet mixed powder into a rotating roller in batches intermittently, slightly and uniformly, and obtaining welding flux particles through rotating friction forming of the roller;
s5, sieving: passing the formed flux particles through a sieve of 20-80 meshes to obtain a semi-finished flux with target granularity;
s6, low-temperature drying: and drying the sieved semi-finished flux at the low temperature of 300-350 ℃ for 55-65 minutes.
S7, sieving: sieving the flux dried at low temperature again, and crushing the flux agglomerated in the drying process to obtain uniform flux particles;
s8, sintering: and (5) sintering the flux particles obtained in the step S7 at 550-600 ℃, wherein the sintering time is 55-65 minutes, and preparing the finished flux.
The prepared finished flux needs to be re-baked at 350 +/-10 ℃ for 2 hours before use.
TABLE 1 composition ratio of basic sintered flux for submerged arc welding (/%)
Comparative example 1
Sintered flux prepared by the method of example 1 of CN 111660038B.
The effects of the fluxes prepared by the method of the present invention are further illustrated by the example of the finished fluxes prepared in examples 1-8. The finished fluxes prepared in examples 1-8 were combined with a high manganese steel submerged arc welding wire of the designation SRSF40Mn for evaluation of welding manufacturability and for welding of deposited metal and butt-jointed test panels. Wherein the deposited metal welding is performed according to table 2, and the butt-joint test plate welding parameters are performed according to table 3.
The welding test plate is made of 20mm high-manganese austenitic steel meeting the requirements of ASTMA1106-2017, the fusion welding test plate groove is a V-shaped groove with the angle of 10-12 degrees, the length of the test plate is 400-500 mm, and the root gap is 14-16 mm.
The bevels of the butt-joint test plates are K-shaped bevels 1/3 and 2/3, wherein the angle of the large-surface bevel is 50 degrees, the angle of the small-surface bevel is 60 degrees, the length of the test plate is 500-600 mm, and the root gap is 0-2 mm.
Welding manufacturability the welding arc stability, slag detachability, spreadability, weld bead formation, amount of smoke, and the like were mainly considered, and the sintered fluxes prepared in examples 1 to 8 and comparative example 1 were welded in a flat plate and a groove according to the welding manufacturability evaluation items shown in table 4, and evaluated and scored by a professional welder. The deposited metal is subjected to a round bar tensile test and a-196 ℃ impact test, and the mechanical property results are shown in Table 5; the butt joints were subjected to transverse plate drawing, transverse cold bending and-196 ℃ impact tests, and the results are shown in table 6.
TABLE 2 deposited metal welding parameters
| Welding material specification/mm | Welding current/A | Welding voltage/V | Welding speed/cm/min | Interchannel temperature/. degree.C |
| Ф3.2 | 420±20 | 30±1 | 42±2 | 80～120 |
TABLE 3 Butt joint weld parameters
| Welding material specification/mm | Welding current/A | Welding voltage/V | Welding speed/cm/min | Interchannel temperature/. degree.C |
| Ф3.2 | 480±20 | 31±2 | 42±2 | 80～120 |
TABLE 4 evaluation of welding workability
Referring to the table for evaluating the welding manufacturability of table 4, the finished fluxes prepared in examples 1 to 6 of the present invention were all evaluated as follows: the arc stability is B stable; the slag detachability is A automatic slag detachability; the spreadability is A excellent; the weld joint is formed to be B beautiful; the smoke amount is A little; the comprehensive evaluation is A excellent. The evaluation results of the flux of comparative example 1 were: the arc stability is B stable; the slag detachability is poor; spreadability is good B; the weld joint is formed to be B beautiful; the smoke amount is less than B; the overall evaluation was C general. It can be seen that the welding fluxes of examples 1-8, which are prepared by the alkaline sintered flux for submerged arc welding and the preparation method thereof, have better welding manufacturability evaluation than that of comparative example 1, and particularly can automatically remove slag, and can automatically remove slag in both a flat plate and a groove. In contrast, comparative example 1 had poor slag removability in the bevel.
TABLE 5 mechanical Properties of deposited metals
TABLE 6 mechanical properties of butt joints
As can be seen from tables 5 to 6, the fluxes prepared in examples 1 to 8 have excellent mechanical properties, good manufacturability of sintered fluxes, low crack sensitivity, good mechanical properties of deposited metals and butt joints, and can be matched with high manganese steel submerged arc welding wires for use. And performing dye penetrant inspection on each welding pass in the welding process of melting and butting test plates, and performing ray inspection after the test plates are placed for 48 hours at room temperature, wherein defects such as cracks are not found. Ilmenite, electrolytic manganese metal, chromium metal and graphite in the flux supplement burning loss carbon, manganese, chromium and titanium elements in the welding process, make up the burning loss in a welding wire in the welding process, effectively inhibit the growth of crystal grains, refine the crystal grains, and thus adjust and ensure deposited metal components to ensure good comprehensive mechanical properties. The graphite makes a little carbon element enter deposited metal, and further improves the strength. The sintered flux prepared in the comparative example 1 has cracks, the cracks need to be polished, the workload of welders is increased, the welding efficiency is greatly reduced, the crack sensitivity is high, and the sintering temperature is above 700 ℃. The sintered fluxes prepared in examples 1 to 8 were free of crack defects and the sintering temperature was lowered to 550 ℃ to 600 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The high-alkalinity sintered flux for submerged arc welding of the austenitic low-temperature steel comprises dry powder and a binder, and is characterized in that the dry powder comprises the following raw materials in parts by weight: 26-35% of fused magnesia, 24-29% of fluorite, 10-18% of wollastonite, 12-18% of alumina, 0.1-0.5% of aluminum-magnesium alloy, 0.1-1% of sodium fluoroaluminate, 0.1-1% of sodium carbonate, 0.1-1% of potassium carbonate and a supplement, wherein the addition amount of the binder is 19-23% of the weight of the dry powder.
2. The high alkaline sintered flux for submerged arc welding of austenitic low temperature steel as claimed in claim 1, wherein said wollastonite mainly comprises 46-55% CaO and 43-50% SiO 2 。
3. The highly alkaline sintered flux for submerged arc welding of austenitic low-temperature steel as claimed in claim 1, wherein said binder is soda-potash water glass with a modulus of 2.9, a molar ratio of sodium to potassium of 1:3, and a baume degree of 38-45 ° Be.
4. The high-alkaline sintered flux for submerged arc welding of austenitic low-temperature steel as claimed in claim 1, wherein the extender is ilmenite 1-3%, electrolytic manganese metal 2-5%, metallic chromium 1-2%, graphite 0.1-0.6%.
5. A method for preparing the high-alkaline sintered flux for submerged arc welding of austenitic low-temperature steel according to any one of claims 1 to 4, comprising the steps of:
s1, weighing: weighing the dry powder and the binder according to the parts by weight, and putting the dry powder and the binder into a clean container for later use;
s2, dry mixing: sieving and mixing alumina and wollastonite in a container, then mixing the sieved mixture with other dry powder materials, pouring the mixture into a mixer, and stirring for 20-25 minutes to uniformly mix the dry powder;
s3, wet mixing: uniformly adding the binder into the uniformly mixed dry powder, and continuously stirring for 20-25 minutes by using a mixer;
s4, granulation: adding the wet mixed powder into a rotating roller, and obtaining welding flux particles through rotating friction forming of the roller;
s5, sieving: passing the formed flux particles through a 20-80-mesh sieve to obtain a semi-finished flux with target granularity;
s6, drying: drying the screened semi-finished flux;
s7, sieving: sieving the dried flux again, and crushing the flux agglomerated in the drying process to obtain uniform flux particles;
s8, sintering: and sintering the flux particles obtained in the step S7 to prepare the finished flux.
6. The method of claim 5, wherein the wet-mixed powder is intermittently, uniformly and in small amounts fed to the rotating drum in step S4.
7. The method for preparing the high alkaline sintered flux for submerged arc welding of austenitic low temperature steel according to claim 5, wherein in step S6, the screened semi-finished flux is dried at low temperature of 300-350 ℃ for 55-65 minutes.
8. The method for preparing a highly basic sintered flux for submerged arc welding of austenitic low-temperature steel as claimed in claim 5, wherein in step S8, the flux particles of step S7 are sintered at 550-600 ℃ for 55-65 minutes.
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| CN115635213A (en) * | 2022-12-23 | 2023-01-24 | 天津市金桥焊材科技有限公司 | Arc striking agent for welding electrode |
| CN116117375A (en) * | 2022-12-14 | 2023-05-16 | 合肥工业大学 | Cobalt-free iron-based multielement composite hard wear-resistant alloy flux-cored wire and preparation method and application thereof |
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| CN115635213B (en) * | 2022-12-23 | 2023-04-07 | 天津市金桥焊材科技有限公司 | Arc striking agent for welding electrode |
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