CN111673316A - Fluorine-alkali sintered flux and preparation method and application thereof - Google Patents
Fluorine-alkali sintered flux and preparation method and application thereof Download PDFInfo
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- CN111673316A CN111673316A CN202010538428.7A CN202010538428A CN111673316A CN 111673316 A CN111673316 A CN 111673316A CN 202010538428 A CN202010538428 A CN 202010538428A CN 111673316 A CN111673316 A CN 111673316A
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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
- B23K35/362—Selection of compositions of fluxes
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Abstract
The invention discloses a fluorine-alkali sintered flux which is prepared by sintering the following raw materials in parts by weight and 21-27 parts of sodium potassium water glass: 4-5 parts of manganese ore, 22-27 parts of alumina, 27-33 parts of dead burned magnesia, 20-25 parts of fluorite powder, 1-2 parts of ferrosilicon alloy and 5-10 parts of wollastonite. The sintered flux prepared by the invention has excellent low-temperature impact resistance. The invention also provides a specific preparation method for sintering the flux and application of the flux in X70 pipeline steel welding, and the sintered flux prepared by sintering the flux can be completely applied to X70 pipeline steel.
Description
Technical Field
The invention relates to the technical field of welding flux, in particular to a fluorine-alkali sintered welding flux, and provides a preparation method and application thereof.
Background
Submerged arc welding is one of the current mechanized welding methods with higher production efficiency, the conductive length of a welding wire is shortened, the current and the current density are improved, so the penetration of an electric arc and the deposition efficiency of the welding wire are greatly improved, the electric arc basically has no heat radiation loss and less splashing due to the heat insulation effect of a welding flux and slag, the production efficiency is higher, in addition, the protection effect of the slag for insulating air is good, welding parameters can be kept stable through automatic adjustment, the requirement on the technical level of a welder is not high, the components of a welding seam are stable, the mechanical performance is better, meanwhile, the arc light radiation is avoided, and the welding wire is relatively safe for operators.
The fluxes used for submerged arc welding can be divided into three types: fluxes are generally classified into three types, i.e., a melting flux, a sintering flux, and a ceramic flux, depending on the manufacturing method. The sintered flux has the advantages of high quality, high efficiency, energy conservation, environmental protection, no smoke, no odor, no arc and no splash during welding, no environmental pollution in the production and manufacturing process, low energy consumption, full utilization of raw materials and the like, and is widely applied. Alkaline sintered flux is an important classification of sintered flux, which can effectively reduce the oxygen content of a welding seam, but due to the influence of the composition components of the sintered flux, the welding seam is easy to generate oxide slag inclusion, pores and cracks, which cause the deficiency of impact toughness, especially in the welding process of X70 pipeline steel. The X70 pipeline steel can meet the requirements of forward large-caliber and high-pressure transportation required in the transportation process of oil and gas pipelines, and simultaneously has higher strength, low-temperature toughness and excellent welding performance, so the X70 pipeline steel becomes the most used steel grade in international oil and gas long-distance pipeline steel, the X70 pipeline steel also requires excellent low-temperature toughness for used welding flux, and the general alkaline sintered welding flux cannot meet the requirements, so the X70 pipeline steel is not suitable for X70 pipeline steel.
Disclosure of Invention
In view of the defects of the prior art, one of the purposes of the invention is to provide a fluorine-alkali sintered flux which has better low-temperature impact toughness and is suitable for welding X70 pipeline steel, the second purpose of the invention is to provide a preparation method of the fluorine-alkali sintered flux, and the third purpose of the invention is to provide the application of the fluorine-alkali sintered flux.
In order to realize the first purpose, the invention provides a fluorine-alkali sintered flux which is prepared by adding 21-27 parts of potassium-sodium water glass into the following raw materials in parts by weight:
the technical scheme adopts the ore raw materials to prepare the sintered flux, the raw materials mostly adopt different ores, the sources of the ores are wide, the cost is low, the ores also contain various metal elements, and the sintered ores are favorable for generating a metallographic phase for improving the performance of the flux.
Wherein the manganese ore is produced from Australia, and the manganese content is more than 45 percent;
bauxite is produced from Henan province and has an alumina content of more than 80 percent;
the dead burned magnesite is produced from Liaoning Dashiqiao, and the content of magnesium oxide is more than 90 percent;
the fluorite powder is produced from Wuyi Zhejiang, and the content of calcium fluoride is more than 95 percent;
wollastonite produced in Yichun Jiangxi mainly comprises Ca040.0-50.0% and SiO247.0-52.0%;
the modulus of the potash water glass is 3.0.
Further, the raw materials also comprise 1-2 parts of nickel-manganese alloy.
The nickel-manganese alloy is added to further improve the impact property of the weld.
Furthermore, the nickel-manganese alloy is prepared by the following steps:
s1, adding 1 part by weight of nickel and 3 parts by weight of manganese into a crucible in a high-temperature evaporator respectively, vacuumizing the reaction system after checking that the air tightness of the reaction system is qualified, then opening a nitrogen valve arranged at the bottom of the high-temperature evaporator, and filling nitrogen into the reaction system to ensure that the atmosphere in the reaction system is inert and the internal pressure of the reaction system is 1.4 atmospheres;
s2, starting a plasma gun arranged at the top of the high-temperature evaporator, heating and evaporating the nickel raw material and the manganese raw material by using the generated high-frequency plasma nitrogen as a heating source, heating the nickel raw material and the manganese raw material to a boiling state to form nickel vapor and manganese vapor, forming mixed vapor of the nickel vapor and the manganese vapor in the high-temperature evaporator, adding the nickel raw material and the manganese raw material while evaporating, wherein the adding speed of the nickel raw material is 900g/h, and the adding speed of the manganese raw material is 100 g/h; the pressure of the nitrogen is 0.5 MPa;
s3, adjusting the flow rate of the nitrogen at the bottom of the high-temperature evaporator to 100m3Conveying the evaporated nickel vapor and manganese vapor to a particle controller communicated with the high-temperature evaporator along with nitrogen gas flow, and colliding, fusing and solidifying the nickel vapor and the manganese vapor in the particle controller to form nickel-manganese alloy particles; the particle controller is specifically a cold collecting pipe, and the structure of the cold collecting pipe comprises five layers, namely a graphite pipe, a carbon felt pipe and a carbon felt pipe from inside to outside in sequenceThe cooling system comprises a stainless steel pipe, a stainless steel pipe and a cold water circulating system, wherein the cold water circulating system is arranged between the two layers of stainless steel pipes;
s4, conveying the nickel-manganese alloy particles to a collector communicated with the particle controller by nitrogen airflow in the particle controller, enabling the nickel-manganese alloy particles to be attached to the outer wall of a gas-solid separator in the collector, and then opening a nitrogen valve arranged in the gas-solid separator at the tail end of the airflow to enable the nickel-manganese alloy particles on the outer wall of the gas-solid separator to be collected in a collecting hopper at the bottom of the collector to obtain the nano-scale nickel-manganese alloy powder.
By adding the specially-made nickel-manganese alloy, metal elements in the original raw materials can be increased, and a welding line with more excellent performance is formed.
Further, the fluorine-alkali sintering welding is formed by sintering the following raw materials in parts by weight with 23 parts of sodium potassium water glass:
through optimizing the dosage of each raw material, the mixture ratio with high impact performance after sintering is screened out.
Furthermore, the raw materials also comprise 0.5-2 parts of a silicon-manganese compound deoxidizer.
The addition of deoxidizer can reduce the generation of air holes and pockmarks, thereby improving the impact toughness of the welding seam.
The second purpose of the invention is to provide a preparation method of the fluorine-alkali sintered flux, which is prepared by adopting the following method:
weighing the raw materials according to the parts by weight, placing the raw materials into a stirrer, and adding 21-27 parts by weight of potassium-sodium water glass to mechanically stir for 5 min; after stirring, the mixture enters a granulator for granulation, and then enters a dryer for drying; and (3) screening after drying, putting the material with the granularity of 10-40 meshes into a sintering furnace for sintering, wherein the sintering temperature is 780-minus-one 850 ℃, and putting the sintered material into a cooling cylinder for natural cooling to obtain the material.
By adopting the process of granulating, drying and sintering after the potassium-sodium water glass is used as the adhesive for bonding, the preparation method is simple, and the prepared sintered flux has stable performance.
Further, the amount of the potassium-sodium water glass is 23 parts by weight.
Further, the sintering temperature is 810 ℃.
Through the screening of the dosage of the adhesive and the sintering temperature, the sintering process can be accelerated, and the prepared sintered flux has stable performance.
The third purpose of the invention is to provide the application of the fluorine alkali sintered flux in X70 pipeline steel welding.
The sintered flux can be used for welding various low-alloy structural steels by matching with proper welding wires such as H08MnA, H10Mn2, H08MnMoA and H08Mn2MoA, and is used for important welding products such as ship hulls, boilers, pressure vessels, X70 pipeline steel and the like. Multilayer welding, double-sided single pass welding, multi-wire welding and narrow gap submerged arc welding may be used.
The invention has the following beneficial effects:
1. according to the fluorine-alkali sintering welding, the prepared fluorine-alkali sintering welding flux has excellent low-temperature impact resistance toughness by adopting the mineral raw materials and adding the special alloy;
2. the fluorine-alkali sintered flux provided by the invention has the advantages of stable electric arc combustion after use, easy slag removal, no pocking mark, no slag adhesion and attractive weld joint forming;
3. the preparation method provided by the invention is simple and easy to operate;
4. the sintered flux can be used for welding various low alloy steels, such as ship hulls, boilers, pressure vessels, X70 pipeline steel and the like.
Detailed Description
The present invention will be further described with reference to the following examples.
Preparation example 1
Preparing the nickel-manganese alloy:
s1, adding 1 part by weight of nickel and 3 parts by weight of manganese into a crucible in a high-temperature evaporator respectively, vacuumizing the reaction system after checking that the air tightness of the reaction system is qualified, then opening a nitrogen valve arranged at the bottom of the high-temperature evaporator, and filling nitrogen into the reaction system to ensure that the atmosphere in the reaction system is inert and the internal pressure of the reaction system is 1.4 atmospheres;
s2, starting a plasma gun arranged at the top of the high-temperature evaporator, heating and evaporating the nickel raw material and the manganese raw material by using the generated high-frequency plasma nitrogen as a heating source, heating the nickel raw material and the manganese raw material to a boiling state to form nickel vapor and manganese vapor, forming mixed vapor of the nickel vapor and the manganese vapor in the high-temperature evaporator, adding the nickel raw material and the manganese raw material while evaporating, wherein the adding speed of the nickel raw material is 900g/h, and the adding speed of the manganese raw material is 100 g/h; the pressure of the nitrogen is 0.5 MPa;
s3, adjusting the flow rate of the nitrogen at the bottom of the high-temperature evaporator to 100m3Conveying the evaporated nickel vapor and manganese vapor to a particle controller communicated with the high-temperature evaporator along with nitrogen gas flow, and colliding, fusing and solidifying the nickel vapor and the manganese vapor in the particle controller to form nickel-manganese alloy particles; the particle controller is specifically a cold accumulating pipe, the structure of the cold accumulating pipe comprises five layers, namely a graphite pipe, a carbon felt pipe, a stainless steel pipe and a stainless steel pipe from inside to outside, and a cold water circulating system is arranged between the two layers of stainless steel pipes;
s4, conveying the nickel-manganese alloy particles to a collector communicated with the particle controller by nitrogen airflow in the particle controller, enabling the nickel-manganese alloy particles to be attached to the outer wall of a gas-solid separator in the collector, and then opening a nitrogen valve arranged in the gas-solid separator at the tail end of the airflow to enable the nickel-manganese alloy particles on the outer wall of the gas-solid separator to be collected in a collecting hopper at the bottom of the collector to obtain the nano-scale nickel-manganese alloy powder.
Example 1
Weighing the raw materials according to the parts by weight, placing the raw materials into a stirrer, and adding 21 parts by weight of potassium-sodium water glass to mechanically stir for 5 min; after stirring, the mixture enters a granulator for granulation, and then enters a dryer for drying; and (3) drying, screening, putting the material with the granularity of 10-40 meshes into a sintering furnace for sintering at the sintering temperature of 850 ℃, and putting the sintered material into a cooling cylinder for natural cooling to obtain the material. The specific raw materials and the dosage are shown in Table 1
Example 2
Weighing the raw materials according to the parts by weight, placing the raw materials into a stirrer, and adding 23 parts by weight of potassium-sodium water glass to mechanically stir for 5 min; after stirring, the mixture enters a granulator for granulation, and then enters a dryer for drying; and (3) drying, screening, putting the material with the granularity of 10-40 meshes into a sintering furnace for sintering at the sintering temperature of 810 ℃, and putting the sintered material into a cooling cylinder for natural cooling to obtain the material. The specific raw materials and the dosage are shown in Table 1
Example 3
Weighing the raw materials according to the parts by weight, placing the raw materials into a stirrer, and adding 27 parts by weight of potassium-sodium water glass to mechanically stir for 5 min; after stirring, the mixture enters a granulator for granulation, and then enters a dryer for drying; and (3) drying, screening, putting the material with the granularity of 10-40 meshes into a sintering furnace for sintering, wherein the sintering temperature is 780 ℃, and putting the sintered material into a cooling cylinder for natural cooling to obtain the material. The specific raw materials and the dosage are shown in Table 1
Example 4
On the basis of example 2, 1 part by weight of the nickel manganese alloy prepared in preparation example 1 was added to the raw materials.
Example 5
On the basis of example 2, 1.5 parts by weight of the nickel-manganese alloy prepared in preparation example 1 was added to the raw materials.
Example 6
2 parts by weight of the nickel-manganese alloy prepared in preparation example 1 was added to the raw materials in addition to example 2.
Example 7
In addition to example 5, 0.5 part by weight of a silicomanganese complex deoxidizer was added to the raw materials.
Example 8
In addition to example 5, 1 part by weight of a silicomanganese complex deoxidizer was added to the raw materials.
Example 9
In addition to the example 5, 2 parts by weight of a silicomanganese complex deoxidizer was added to the raw materials.
The raw materials and the amounts used in examples 1-9 are as follows:
| manganese ore | Alumina (A) | Dead burned magnesia | Fluorite powder | Silicon-iron alloy | Wollastonite | Nickel-manganese alloy | Silicon-manganese composite deoxidant | Potassium sodium silicate | |
| Example 1 | 4 | 27 | 27 | 25 | 1.5 | 10 | 21 | ||
| Example 2 | 4.5 | 25 | 30 | 23 | 1 | 7 | 23 | ||
| Example 3 | 5 | 22 | 33 | 20 | 2 | 5 | 27 | ||
| Example 4 | 4.5 | 25 | 30 | 23 | 1 | 7 | 1 | 23 | |
| Example 5 | 4.5 | 25 | 30 | 23 | 1 | 7 | 1.5 | 23 | |
| Example 6 | 4.5 | 25 | 30 | 23 | 1 | 7 | 2 | 23 | |
| Example 7 | 4.5 | 25 | 30 | 23 | 1 | 7 | 1.5 | 0.5 | 23 |
| Example 8 | 4.5 | 25 | 30 | 23 | 1 | 7 | 1.5 | 1 | 23 |
| Example 9 | 4.5 | 25 | 30 | 23 | 1 | 7 | 1.5 | 2 | 23 |
Test for testing welding performance
The flux frits of the flux type of fluorine alkali prepared in examples 1 to 9 were off-white round particles having a particle size of 10 to 40 mesh.
The welding test of direct current reverse connection H08Mn2NiE welding wires is adopted, the mechanical characteristics of welding seams and detection welding seams are observed, each welding seam has no pocking mark, no slag sticking and attractive welding seam forming.
The deposited metal mechanical property test piece is detected according to GB/T25774.1, the tensile test is detected according to GB/T2651, the impact absorption power is detected according to GB/T2650, and the detection results are as follows:
it can be seen from the above examples that in examples 1-3, the impact performance of example 2 is the best, which means that the mixture ratio of example 2 is better, in examples 4-6, the performance is improved significantly because of the addition of the specially made nickel-manganese alloy, while the experiment result is improved by the addition of the deoxidizer in examples 7-9, but the experiment result is only slightly improved, which means that the performance is not greatly affected by the addition of the deoxidizer, the deoxidizing effect of the sintered flux prepared by the present invention is better, the low temperature impact performance of the fluorine-alkali sintered flux provided by the present invention is excellent, and the sintered flux can be used not only for general low temperature alloy steel, such as ship hull, pressure vessel, etc., but also for X70 pipeline steel.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The sintered flux is characterized by being prepared by adding 21-27 parts of sodium potassium water glass into the following raw materials in parts by weight:
4-5 parts of manganese ore
Alumina 22-27
Dead burned magnesia 27-33
20-25% fluorite powder
Silicon-iron alloy 1-2
5-10 parts of wollastonite.
2. The sintered flux of claim 1, further comprising 1 to 2 parts of a nickel-manganese alloy.
3. The sintered flux of claim 2, wherein said nickel manganese alloy is prepared by the steps of:
s1, adding 1 part by weight of nickel and 3 parts by weight of manganese into a crucible in a high-temperature evaporator respectively, vacuumizing the reaction system after checking that the air tightness of the reaction system is qualified, then opening a nitrogen valve arranged at the bottom of the high-temperature evaporator, and filling nitrogen into the reaction system to ensure that the atmosphere in the reaction system is inert and the internal pressure of the reaction system is 1.4 atmospheres;
s2, starting a plasma gun arranged at the top of the high-temperature evaporator, heating and evaporating the nickel raw material and the manganese raw material by using the generated high-frequency plasma nitrogen as a heating source, heating the nickel raw material and the manganese raw material to a boiling state to form nickel vapor and manganese vapor, forming mixed vapor of the nickel vapor and the manganese vapor in the high-temperature evaporator, adding the nickel raw material and the manganese raw material while evaporating, wherein the adding speed of the nickel raw material is 900g/h, and the adding speed of the manganese raw material is 100 g/h; the pressure of the nitrogen is 0.5 MPa;
s3, adjusting the flow rate of the nitrogen at the bottom of the high-temperature evaporator to 100m3Conveying the evaporated nickel vapor and manganese vapor to a particle controller communicated with the high-temperature evaporator along with nitrogen gas flow, and colliding, fusing and solidifying the nickel vapor and the manganese vapor in the particle controller to form nickel-manganese alloy particles; the particle controller is specifically a cold collecting pipe, and the structure of the cold collecting pipe comprises five layers, namely a graphite pipe, a carbon felt pipe and carbon from inside to outside in sequenceThe cooling system comprises a felt pipe, stainless steel pipes and stainless steel pipes, wherein a cold water circulating system is arranged between the two layers of stainless steel pipes;
s4, conveying the nickel-manganese alloy particles to a collector communicated with the particle controller by nitrogen airflow in the particle controller, enabling the nickel-manganese alloy particles to be attached to the outer wall of a gas-solid separator in the collector, and then opening a nitrogen valve arranged in the gas-solid separator at the tail end of the airflow to enable the nickel-manganese alloy particles on the outer wall of the gas-solid separator to be collected in a collecting hopper at the bottom of the collector to obtain the nano-scale nickel-manganese alloy powder.
4. The sintered flux of claim 1, wherein the sintered flux is prepared by sintering the following raw materials in parts by weight with 23 parts of sodium potassium silicate:
manganese ore 4.5
Alumina 25
Dead burned magnesite 30
Fluorite powder 23
Silicon-iron alloy 1
Wollastonite 7
1.5 of nickel-manganese alloy.
5. The sintered flux of claim 4, wherein said raw materials further comprise 0.5-2 parts of a silicon-manganese complex deoxidizer.
6. A method for preparing the flux according to any one of claims 1 to 5, wherein the preparation steps are specifically as follows:
weighing the raw materials according to the parts by weight, placing the raw materials into a stirrer, and adding 21-27 parts by weight of potassium-sodium water glass to mechanically stir for 5 min; after stirring, the mixture enters a granulator for granulation, and then enters a dryer for drying; and (3) screening after drying, putting the material with the granularity of 10-40 meshes into a sintering furnace for sintering, wherein the sintering temperature is 780-minus-one 850 ℃, and putting the sintered material into a cooling cylinder for natural cooling to obtain the material.
7. The method for preparing sintered flux of fluorine alkali according to claim 6 wherein the amount of the potassium sodium water glass is 23 parts by weight.
8. The method for preparing sintered flux of fluorine alkali as claimed in claim 6 or 7, wherein the sintering temperature is 810 ℃.
9. Use of the flux prepared according to claims 1-5 for welding X70 pipeline steel.
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Application publication date: 20200918 |