CN114850724B - High-alkalinity sintered flux for submerged arc welding of austenitic low-temperature steel and preparation method thereof - Google Patents
High-alkalinity 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 an overbased 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 magnesia, 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. By reasonably optimizing the proportion of slag forming components and increasing the alkalinity of a slag system, the weld joint spreadability is good, and automatic deslagging can be realized in a flat plate and a groove; the trace adjustment is carried out by the alloy elements such as C, mn, cr, etc., so as to compensate the burning loss in the welding wire in the welding process, effectively inhibit the growth of crystal grains, ensure the cladding components and improve the comprehensive mechanical property of the welding seam. The high-temperature sintering temperature can be controlled below 600 ℃, and the production cost and sintering energy consumption are reduced, so that 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 an overbased 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 cleaner and efficient fossil energy, the energy consumption ratio of the LNG is increased year by year in the country, the consumption of the LNG in 2030 is expected to break through 6000 hundred million cubes, and the industrial development of the LNG is more and more paid attention to. LNG temperatures as low as-162 c require excellent cryogenic properties of the LNG ship and the materials of construction of the storage tanks. Materials conventionally used for LNG ship (tank) construction are austenitic stainless steel, aluminum alloy, invar alloy, and 9Ni steel, with the 9Ni steel being the largest amount. Because the 9Ni steel plate and the matched welding materials contain nickel with higher content (the nickel content of the steel plate is about 9 percent, and the nickel content of the welding materials is more than 50 percent), the cost of the steel plate and the welding materials is higher, and at present, a plurality of countries and regions are actively developing novel ultralow-temperature materials to replace the traditional materials. The high-manganese ultralow-temperature steel not only has good low-temperature performance, but also has the 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, submerged arc welding is indispensable as an efficient welding mode, and research and development of sintered flux matched with a submerged arc welding wire of the high-manganese austenitic steel for submerged arc welding are vital.
The sintered flux for welding the high-manganese low-temperature steel of CN111660038B and a preparation method thereof disclose that the sintered flux is a sintered product obtained by mixing dry powder and an adhesive, wherein the dry powder comprises the following components in percentage by weight: 18-25% of aluminum oxide, 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 dry powder. With this sintered flux, component segregation and a tendency to heat cracking can be avoided. But the slag is difficult to remove in the groove, part of key elements are seriously burnt, and impurities of hydrogen and oxygen are high.
Disclosure of Invention
In view of the above, the invention aims to provide the high-alkalinity sintered flux for submerged arc welding of austenitic low-temperature steel and the preparation method thereof, the spreadability of the welding seam is good, automatic deslagging can be realized in a flat plate and a groove, the welding seam can be transited with required or burnt alloy elements, and the sensitivity of the welding seam crack is low.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the invention provides an overbased 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 dry powder. By reasonably optimizing the proportion of slag forming components, the alkalinity of a slag system is increased, and the problems of difficult slag removal in a groove and serious oxidation on the surface of a welding line in the welding process are solved.
The main component of the mineral electro-fused magnesia in the sintered flux is MgO, the slag alkalinity can be improved by controlling the addition and the consumption of the component, the higher alkalinity is beneficial to reducing the content of impurity elements, the low-temperature toughness of deposited metal is improved, the slag removing property is also affected to a certain extent, and the mass fraction is controlled to be 26-35%.
The fluorite in the sintered flux of the invention has the main component of CaF 2 By controlling the addition and the dosage of the components, the functions of slagging, dehydrogenation and fluxing agent are realized in the welding flux, the basicity of slag can be improved, the mechanical property of deposited metal can be improved, grains can be refined, and the impact absorption work can be improved. The welding process has certain influence on arc stability, slag removal performance, spreadability and smoke amount, the proper melting point or melting temperature range cannot be obtained when the content is too low or too high, the welding seam cannot be well protected, the forming is unfavorable, and the mass portion is controlled to be between 24 and 29 percent.
Further, the wollastonite mainly comprises 46 to 55 percent of CaO and 43 to 50 percent of SiO 2 And a small amount of impurities. Wollastonite in the flux can improve the pelleting performance of the flux, adjust the viscosity and fluidity of slag, be favorable for promoting short slag, contain no structural water, reduce the phenomenon of air column indentation on the surface of a welding line, improve the welding process performance and control the mass fraction to be 10-18%.
The invention sinters the SiO in the alumina and wollastonite in the flux 2 The combined action of the aluminum oxide and the aluminum oxide can reduce the surface tension of slag, improve the interfacial tension, improve the deslagging property and avoid slag adhesion, and the mass portion of the aluminum oxide is controlled to be 12-18%.
The aluminum magnesium alloy in the sintered flux has extremely high activity, and exothermic reaction occurs in the welding process, so that the adverse effect of high water content of the flux due to low sintering temperature can be reduced.
The sodium fluoroaluminate in the sintered flux has the functions of the flux and the reducing agent, can prevent oxidation reaction, reduces and removes the oxide film on the surface of the welding seam, and solves the problem of serious oxidation on the surface of the welding seam.
K produced by decomposing sodium carbonate and potassium carbonate in the sintered flux of the invention 2 O and Na 2 O belongs to an active component, and the proper addition of O can solve the problem of poor arc stability caused by strong deoxidizing elements and alkaline oxides. Aiming at the problem of difficult deslagging in the prior art, the invention improves the problem of difficult deslagging by improving the alkalinity, but has obvious deoxidization after the alkalinity is improved and poor arc stability, so the arc stability is improved by adding sodium carbonate and potassium carbonate.
Further, the binder is sodium-potassium water glass, the modulus is 2.9, the molar ratio of sodium to potassium is 1:3, and the Baume degree is 38-45 DEG Be. Sodium-potassium water glass is adopted, so that the impurity is less, and the transparency is good.
Further, the extender is 1 to 3 percent of ilmenite, 2 to 5 percent of electrolytic manganese metal, 1 to 2 percent of chromium metal and 0.1 to 0.6 percent of graphite. Ilmenite, electrolytic manganese metal, chromium metal and graphite in the flux are mainly used for supplementing the burning loss of carbon, manganese, chromium and titanium elements in the welding process, deposited metal components are guaranteed through the adjustment of the adding proportion, the problems that deposited metal and joint performance are poor, weld cracks are easy to generate in the welding process and the like caused by the burning loss of welding wire alloy components are solved, good comprehensive mechanical properties are guaranteed, and a small amount of graphite can be added to be capable of transitionally adding a small amount of carbon elements 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%, chromium metal 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 parts by weight, and placing the dry powder and the binder into a clean container for standby;
s2, dry mixing: sieving and mixing alumina and wollastonite in a container, mixing with other dry powder, 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 a mixer;
s4, granulating: adding the wet mixed powder into a rotating roller, and obtaining flux particles through roller rotating friction forming;
s5, sieving: the formed flux particles pass 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 (3) sintering the flux particles in the step (S7) to obtain the finished flux.
Further, in the step S4, the wet-mixed powder is intermittently, slightly and uniformly fed into the rotating drum in batches, so as to obtain more shaped flux particles which are not easy to adhere.
In step S6, the screened semi-finished flux is dried at a low temperature of 300-350 ℃ for 55-65 minutes. And removing the water attached to the surface of the semi-finished flux by low-temperature drying at 300-350 ℃.
Further, in the step S8, the flux particles in the step S7 are sintered at 550 to 600 ℃ for 55 to 65 minutes, so as to further eliminate the moisture in the flux particles.
Compared with the prior art, the high-alkalinity 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 slag forming components and increasing the alkalinity of a slag system, the weld joint spreadability is good, and automatic deslagging can be realized in a flat plate and a groove;
(2) Alloy elements which can be required or burnt can be transited to the welding line, and the crack sensitivity of the welding line 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 is further described below in conjunction with the detailed description. It should be noted that the data in the following examples are obtained by the inventors through a lot of experiments, and are only shown in some of the descriptions, and those skilled in the art can understand and practice the present invention under the data. These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. Further, it should be understood that after reading the present disclosure, those skilled in the art may make various changes or modifications to the present disclosure, which also fall within the scope of the present disclosure. The parts and proportions referred to in this application refer to parts by weight unless otherwise specified.
The invention discloses an overbased 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 active agent, wherein the addition amount of the binder is 19-23% of the weight of 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 is 40 ° Be. The wollastonite mainly comprises 46 to 55 percent of CaO and 43 to 50 percent 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 magnesia, 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 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 parts by weight, and placing the dry powder and the binder into a clean container for standby;
s2, dry mixing: sieving and mixing alumina and wollastonite in a container, mixing with other dry powder, 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 a mixer;
s4, granulating: adding the wet mixed powder into a rotating roller, and obtaining flux particles through roller rotating friction forming;
specifically, in step S4, the wet mixed powder is intermittently, slightly and uniformly fed into a rotating drum in batches, and the flux particles are obtained by the rotary friction forming of the drum. The number of batches is determined by the operator based on the amount of wet-mixed powder and on empirical values. The wet mixed powder is intermittently, slightly and uniformly added into the roller, so that more formed flux particles which are not easy to adhere are conveniently obtained.
S5, sieving: the formed flux particles pass 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 screened semi-finished flux is dried at a low temperature of 300-350 ℃ for 55-65 minutes. And removing the moisture attached to the surface of the semi-finished flux by drying.
S7, sieving: sieving the dried flux again, and crushing the flux agglomerated in the drying process to obtain uniform flux particles;
s8, sintering: sintering the flux particles of step S7.
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 eliminated by step S8, and the obtained flux particles have a particle size of 20 to 80 mesh.
The formulation of the highly basic sintered flux for submerged arc welding of austenitic low temperature steel of the following examples 1 to 10 is shown in Table 1The binder adopts sodium potassium with a modulus of 2.9 and sodium potassium with a modulus of 3:1, the Baume degree is 40 DEG Be, wet mixing granulation flux is carried out, and the addition amount of the binder is 20% of the weight of dry powder. CaO and SiO in wollastonite used 2 The dosage ratio was about 1:1. The method for preparing the alkaline sintered flux for submerged arc welding of examples 1 to 10 adopts the following steps:
s1, weighing: weighing the corresponding dry powder and binder in the table 1 according to parts by weight, and placing the dry powder and binder into a clean container for standby;
s2, dry mixing: firstly, sieving alumina and wollastonite in a container by a 20-mesh sieve, mixing the alumina and wollastonite with other dry powder, pouring the mixture into a mixer together, 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 a mixer;
s4, granulating: intermittently, slightly and uniformly adding the wet mixed powder into a rotary roller in batches, and forming by rotary friction of the roller to obtain flux particles;
s5, sieving: the formed flux particles pass through a 20-80 mesh sieve to obtain a semi-finished flux with target granularity;
s6, low-temperature drying: and (3) drying the screened semi-finished flux at a low temperature of 300-350 ℃ for 55-65 minutes.
S7, sieving: sieving the low-temperature dried flux again, and crushing the flux agglomerated in the drying process to obtain uniform flux particles;
s8, sintering: sintering the flux particles in the step S7 at 550-600 ℃ for 55-65 minutes to obtain the finished flux.
Before the prepared finished flux is used, re-baking is needed for 2 hours at the temperature of 350+/-10 ℃.
TABLE 1 alkaline sintered flux composition for submerged arc welding (/%)
Comparative example 1
Sintered flux prepared using the method of example 1 of CN 111660038B.
The effect of the fluxes prepared by the method of the present invention will be further illustrated by taking the finished fluxes prepared in examples 1 to 8 as examples. The finished fluxes prepared in examples 1-8 were combined with a high manganese submerged arc welding wire of SRSF40Mn for welding manufacturability evaluation and welding of deposited metal and butt test plates. 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 adopts 20mm high manganese austenitic steel conforming to the specification of ASTMA1106-2017, the 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 grooves of the butt joint test plates are K-shaped grooves with the angles of 1/3 and 2/3, wherein the large-surface groove angle is 50 degrees, the small-surface groove angle is 60 degrees, the length of the test plate is 500-600 mm, and the root gap is 0-2 mm.
Welding manufacturability mainly examined welding arc stability, slag detachability, spreadability, bead formation, dust amount, and the like, 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. Carrying out round bar tensile test and impact test at-196 ℃ on deposited metal, wherein the mechanical property results are shown in Table 5; the butt joint was subjected to transverse plate drawing, transverse cold bending and impact test at-196℃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 | Inter-lane temperature/. Degree.C |
| Ф3.2 | 420±20 | 30±1 | 42±2 | 80～120 |
TABLE 3 Butt joint welding parameters
| Welding material specification/mm | Welding current/A | Welding voltage/V | Welding speed/cm/min | Inter-lane temperature/. Degree.C |
| Ф3.2 | 480±20 | 31±2 | 42±2 | 80～120 |
Table 4 evaluation of welding manufacturability
Referring to the welding manufacturability evaluation table of table 4, the evaluation results of the finished fluxes prepared in examples 1 to 6 of the present invention are: the arc stability is B stability; the deslagging performance is automatic deslagging of A; the spreadability is A; the welding seam is formed to be B attractive; the smoke dust amount is less than A; comprehensive evaluation was a-you. The evaluation result of the flux of comparative example 1 was: the arc stability is B stability; the deslagging performance is poor; the spreadability is B good; the welding seam is formed to be B attractive; the smoke dust amount is less B; the overall evaluation was C. It can be seen that the welding process evaluation of the alkaline sintered flux for submerged arc welding and the fluxes of examples 1 to 8 prepared by the method of the invention is superior to that of comparative example 1, and particularly, the alkaline sintered flux can automatically remove slag, and can realize automatic slag removal in a flat plate and a groove. While comparative example 1 had poor deslagging in the groove.
TABLE 5 mechanical Properties of deposited metal
TABLE 6 mechanical Properties of Butt joint
As can be seen from tables 5-6, the fluxes prepared in examples 1-8 have excellent mechanical properties, and the sintered fluxes have good manufacturability, low crack sensitivity, and good mechanical properties of both deposited metal and butt joint, and can be used as matched with high manganese steel submerged arc welding wires. And (3) performing dye check on each layer of welding beads in the cladding and butt joint test plate welding processes, and performing radiographic check after the test plate is 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 carbon, manganese, chromium and titanium elements burnt in the welding process, compensate for the burnt in the welding process, effectively inhibit the growth of crystal grains, refine the crystal grains, thereby adjusting and ensuring deposited metal components and ensuring good comprehensive mechanical properties. The graphite allows a small amount of carbon element to enter the deposited metal, and further improves the strength. The sintered flux prepared in comparative example 1 has cracks, the cracks are 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 had no crack defect, and the sintering temperature was reduced to 550 ℃ to 600 ℃.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
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 dry powder; preparing the dry powder and the binder into flux particles, and sintering the flux particles at 550-600 ℃ for 55-65 minutes.
2. The high alkaline sintered flux for submerged arc welding of austenitic low temperature steel according to claim 1, wherein the wollastonite mainly comprises46-55% CaO and 43-50% SiO 2 。
3. The high alkaline sintered flux for submerged arc welding of austenitic low temperature steel according to claim 1, wherein the binder is sodium-potassium water glass, the modulus is 2.9, the molar ratio of sodium to potassium is 1:3, and the baume degree is 38-45 ° Be.
4. The high alkaline sintered flux for submerged arc welding of austenitic low temperature steel according to claim 1, wherein the extender is ilmenite 1-3%, electrolytic manganese metal 2-5%, chromium metal 1-2%, graphite 0.1-0.6%.
5. A method of preparing an overbased sintered flux for submerged arc welding of austenitic low temperature steel as claimed in any of claims 1 to 4, comprising the steps of:
s1, weighing: weighing the dry powder and the binder according to parts by weight, and placing the dry powder and the binder into a clean container for standby;
s2, dry mixing: sieving and mixing alumina and wollastonite in a container, mixing with other dry powder, 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 a mixer;
s4, granulating: adding the wet mixed powder into a rotating roller, and obtaining flux particles through roller rotating friction forming;
s5, sieving: the formed flux particles pass 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 (3) sintering the flux particles in the step (S7) to obtain the finished flux.
6. The method for preparing the high alkaline sintered flux for submerged arc welding of austenitic low temperature steel according to claim 5, wherein in the step S4, the wet mixed powder is intermittently, slightly and uniformly fed into the rotating drum in batches.
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 the step S6, the screened semi-finished flux is dried at a low temperature of 300-350 ℃ for 55-65 minutes.
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| JP3617605B2 (en) * | 1998-10-01 | 2005-02-09 | 株式会社神戸製鋼所 | Bond flux for submerged arc welding |
| CN104708231B (en) * | 2015-03-17 | 2017-06-16 | 北京金威焊材有限公司 | Nickel-base strip pole electroslag welding sintered flux |
| CN106624460B (en) * | 2017-01-06 | 2021-06-04 | 招商局重工（江苏）有限公司 | Marine low-temperature steel submerged-arc welding sintered flux |
| CN107745203A (en) * | 2017-09-29 | 2018-03-02 | 四川西冶新材料股份有限公司 | Large-scale water power 800MPa level high-strength steel submerged arc fluxes and its production method |
| CN109175788B (en) * | 2018-11-26 | 2021-01-26 | 北京金威焊材有限公司 | Submerged arc sintered flux for stainless steel at low temperature |
| CN110181195B (en) * | 2019-05-28 | 2021-07-30 | 阳江职业技术学院 | Material for submerged arc welding for X100 pipeline steel |
| CN111660038B (en) * | 2020-05-07 | 2021-12-24 | 中国船舶重工集团公司第七二五研究所 | Sintered flux for welding high-manganese low-temperature steel and preparation method thereof |
| CN113319470A (en) * | 2021-06-21 | 2021-08-31 | 中国船舶重工集团公司第七二五研究所 | Bonding flux capable of transferring alloy elements and used for nickel-based welding wire and preparation method thereof |
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| CN102350598A (en) * | 2011-09-22 | 2012-02-15 | 中国船舶重工集团公司第七二五研究所 | Chromium-nickel austenitic stainless steel submerged-arc welding sintered flux |
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