CN109175788B - Submerged arc sintered flux for stainless steel at low temperature - Google Patents
Submerged arc sintered flux for stainless steel at low temperature Download PDFInfo
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- CN109175788B CN109175788B CN201811413993.XA CN201811413993A CN109175788B CN 109175788 B CN109175788 B CN 109175788B CN 201811413993 A CN201811413993 A CN 201811413993A CN 109175788 B CN109175788 B CN 109175788B
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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
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
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Abstract
The invention relates to a submerged arc sintered flux for stainless steel at low temperature, which is prepared from dry powder of various components and a binder, namely water glass, and is characterized in that the dry powder comprises the following components in parts by weight: 15-30 parts of fluorite, 15-30 parts of white corundum, 20-35 parts of magnesia, 10-25 parts of wollastonite and 1-5 parts of alloy powder. The flux is prepared according to a method comprising the following steps: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material. The flux of the present invention exhibits excellent effects as described in the specification.
Description
Technical Field
The invention relates to a submerged arc sintered flux for stainless steel at low temperature, which is mainly suitable for submerged arc welding of stainless steel, in particular to medium plate welding in petrochemical industry, nuclear power industry and the like.
Background
With the development of modern industry and the improvement of automation level, the stainless steel submerged arc automatic welding is widely applied to the industries of petrifaction, nuclear power and the like due to the characteristics of high automation degree, high welding speed and good welding seam technological performance. At present, when a common welding flux is used for welding medium and thick plates, the technological properties such as forming, deslagging and the like are poor, the burning loss of alloy elements is large, the toughness at minus 196 ℃ is poor, the corrosion resistance and the like cannot meet the requirements of high-end users, and therefore, the performance of the matched welding material is very important. Previous researches show that the low-alkalinity slag-system sintered flux is easy to obtain good process performance, but the low-temperature toughness is poor; the high alkalinity slag system sintered flux has the advantages of low content of acid oxides, weak oxidizability, strong pore resistance and better low-temperature toughness, so the flux slag system with moderate alkalinity needs to be selected. For submerged arc welding, the properties of the weld and the quality of the weld depend mainly on the flux in addition to the welding wire, and the demand for high quality flux is increasing rapidly.
The prior art discloses the formulation of some welding fluxes, for example, CN108057964A (application No. 201711323063.0, jinwei) discloses a sintered welding flux for submerged arc welding of a nickel-based wire electrode, which is prepared by dry powder and a binder, namely water glass, of multiple components, wherein the dry powder comprises the following components in parts by weight: 48 to 68 parts by weight of fluorite, for example 48 to 60 parts by weight, 18 to 38 parts by weight of white corundum, for example 18 to 25 parts by weight, for example 18 to 21 parts by weight, 15 to 25 parts by weight of magnesia, for example 15 to 21 parts by weight, 5 to 10 parts by weight of wollastonite, for example 5 to 8 parts by weight, and other components; the invention also relates to a manufacturing method of the sintered flux for the submerged arc welding of the nickel-based filament; the sintered flux for submerged arc welding of nickel-based electrodes of the present invention is believed to exhibit excellent properties such as excellent corrosion resistance, excellent welding electroslag pool stability, bead formability and slag detachability, and excellent tensile strength, yield strength, elongation, etc. However, the prior welding flux is difficult to meet the requirements of the application related to the invention. Therefore, those skilled in the art still expect the submerged arc sintered flux for stainless steel at low temperature, and expect the flux to be applicable to submerged arc welding of stainless steel, especially to medium plate welding in petrochemical, nuclear power and other industries.
Disclosure of Invention
The invention solves the technical problem of overcoming the defects of poor welding process performance and poor low-temperature toughness of the existing submerged arc welding agent for stainless steel at low temperature. The invention provides a sintered flux system, which designs a sintered flux, has less burning loss of alloy elements, can better control the content of metal ferrite of a welding seam, has higher impact toughness at-196 ℃, is attractive in welding bead forming, has good slag detachability and has excellent corrosion resistance. The CaF is designed according to the influence of the physical characteristics of the flux slag on the welding process performance2-Al2O3-MgO-SiO2Is a slag system of the flux. Ensure good processing property of weld metalMeanwhile, the alkalinity of the welding flux is properly improved, and the low-temperature toughness of the weld metal is improved. The present invention has been completed based on these findings.
Therefore, the invention provides a sintered flux for stainless steel wire electrode submerged arc welding at low temperature, which is prepared from dry powder of various components and a binder, namely water glass, and is characterized in that the dry powder comprises the following components in parts by weight: 15-30 parts of fluorite, 15-30 parts of white corundum, 20-35 parts of magnesia, 10-25 parts of wollastonite and 1-5 parts of alloy powder.
The sintered flux for the stainless steel wire electrode submerged arc welding at the low temperature is characterized in that the dry powder comprises the following components in parts by weight: 25-30 parts of fluorite, 20-25 parts of white corundum, 20-25 parts of magnesia, 20-25 parts of wollastonite and 2-4 parts of alloy powder.
The sintered flux for the stainless steel wire electrode submerged arc welding at the low temperature is characterized in that the weight ratio of each component in the dry powder is any one of the following ratios 1-6:
proportioning 1: 27 parts of dry-milled fluorite, 22 parts of white corundum, 25 parts of sintered magnesia, 23 parts of wollastonite and 3 parts of alloy powder;
and (2) proportioning: 25 parts of dry-milled fluorite, 25 parts of white corundum, 25 parts of sintered magnesia, 25 parts of wollastonite and 2 parts of alloy powder;
proportioning 3: 30 parts of dry-milled fluorite, 20 parts of white corundum, 20 parts of sintered magnesia, 20 parts of wollastonite and 4 parts of alloy powder;
and (4) proportioning: 30 parts of dry-milled fluorite, 15 parts of white corundum, 35 parts of sintered magnesia, 10 parts of wollastonite and 5 parts of alloy powder;
and (2) proportioning 5: 15 parts of dry-milled fluorite, 30 parts of white corundum, 20 parts of sintered magnesia, 25 parts of wollastonite and 1 part of alloy powder;
proportioning 6: 26 parts of dry-milled fluorite, 25 parts of white corundum, 22 parts of sintered magnesia, 24 parts of wollastonite and 3 parts of alloy powder.
According to the first aspect of the invention, the sintered flux for stainless steel wire electrode submerged arc welding at low temperature is characterized in that the weight ratio of the binder to the dry powder is 15-25: 100, respectively; for example, the weight ratio of the binder to the dry powder is 20-25: 100.
according to the first aspect of the present invention, the sintered flux for stainless steel wire electrode submerged arc welding at a low temperature is characterized in that the binder is a sintered flux having a potassium-sodium ratio of 1 to 2:1, for example, the binder is a mixture of sodium and potassium in a ratio of 1-1.5: 1, for example, a sodium-potassium ratio of 1: 1 of water glass.
The sintered flux for low-temperature submerged arc welding of stainless steel wires according to the first aspect of the invention is characterized in that the binder sodium potassium silicate has a baume ° bete (20 ℃) of 40.0-46.0, optionally the binder sodium potassium silicate has a modulus of 2.8-3.8. The adhesive potassium sodium silicate is colorless, slightly colored transparent or semitransparent thick liquid or glass block. The sodium potassium silicate of water glass is commercially available, and in the present invention, the water glass is commercially available unless otherwise specified; and in the specific examples, as not otherwise specified, the binder used is a mixture of potassium and sodium in a ratio of 1: 1 of water glass.
The sintered flux for stainless steel wire extreme submerged arc welding at low temperature according to the first aspect of the present invention is characterized in that the fluorite may be added in the form of dry-ground fluorite or in the form of flotation fluorite, and there is no difference in chemical composition between the fluorite and the dry-ground fluorite, and there is no difference in effect when applied to the present invention. In one embodiment, the main component of the fluorite is CaF2。
The sintered flux for low-temperature use for extremely submerged arc welding of stainless steel wire according to the first aspect of the present invention is characterized in that the main component of the white corundum is Al2O3。
The sintered flux for stainless steel wire extreme submerged arc welding at low temperature according to the first aspect of the present invention is characterized in that the magnesite can be added in the form of sintered magnesite or fused magnesite, and the sintered magnesite and the fused magnesite are not different in chemical composition and have no difference in effect when applied to the present invention. In one embodiment, the main component of the magnesite is MgO.
The sintered flux for low-temperature use for extremely submerged arc welding of stainless steel wire according to the first aspect of the present invention is characterized in that the wollastonite mainly contains calcium silicate, typically containing CaO and SiO2. The main ingredient of the natural wollastonite ore is calcium metasilicate (CaSiO)3)。
The sintered flux for low-temperature use for extremely submerged arc welding of stainless steel wire according to the first aspect of the present invention is characterized in that the alloy powder is an alloy powder for balancing deposited metal components. In particular, the inconel powder includes, for example, 20 to 30% of nickel, 50 to 60% of chromium, and the balance of iron, and in the following examples, as not otherwise described, the alloy powder includes 23 to 27% of nickel, 53 to 57% of chromium, and the balance of iron.
The sintered flux for low-temperature use for extremely submerged arc welding of stainless steel wires according to the first aspect of the present invention is characterized in that it is prepared by a method comprising the steps of: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material.
The sintered flux for low-temperature submerged arc welding of a stainless steel wire according to the first aspect of the present invention has a particle size in the range of 20 to 80 mesh.
The sintered flux for low-temperature submerged arc welding of stainless steel wire according to the first aspect of the present invention is a flux for use with an ER308L welding wire. ER308L welding wire is commonly used to weld 304 stainless steel and nuclear power secondary layers.
The sintered flux for low-temperature use for extremely submerged arc welding of stainless steel wire according to the first aspect of the present invention is characterized in that its basicity is in the range of 1.8 to 2.1.
Further, the invention provides a method for preparing the sintered flux for the low temperature of the submerged arc welding of the stainless steel wire electrode, wherein the sintered flux for the low temperature of the submerged arc welding of the stainless steel wire electrode is prepared from dry powder and a binder water glass, and the dry powder comprises the following components in parts by weight: 15-30 parts of fluorite, 15-30 parts of white corundum, 20-35 parts of magnesia, 10-25 parts of wollastonite and 1-5 parts of alloy powder; the method comprises the following steps: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material.
The method according to the second aspect of the invention is characterized in that the dry powder comprises the following components in parts by weight: 25-30 parts of fluorite, 20-25 parts of white corundum, 20-25 parts of magnesia, 20-25 parts of wollastonite and 2-4 parts of alloy powder.
The method according to the second aspect of the invention is characterized in that the weight ratio of each component in the dry powder is any one of the following ratio 1-6:
proportioning 1: 27 parts of dry-milled fluorite, 22 parts of white corundum, 25 parts of sintered magnesia, 23 parts of wollastonite and 3 parts of alloy powder;
and (2) proportioning: 25 parts of dry-milled fluorite, 25 parts of white corundum, 25 parts of sintered magnesia, 25 parts of wollastonite and 2 parts of alloy powder;
proportioning 3: 30 parts of dry-milled fluorite, 20 parts of white corundum, 20 parts of sintered magnesia, 20 parts of wollastonite and 4 parts of alloy powder;
and (4) proportioning: 30 parts of dry-milled fluorite, 15 parts of white corundum, 35 parts of sintered magnesia, 10 parts of wollastonite and 5 parts of alloy powder;
and (2) proportioning 5: 15 parts of dry-milled fluorite, 30 parts of white corundum, 20 parts of sintered magnesia, 25 parts of wollastonite and 1 part of alloy powder;
proportioning 6: 26 parts of dry-milled fluorite, 25 parts of white corundum, 22 parts of sintered magnesia, 24 parts of wollastonite and 3 parts of alloy powder.
The method is characterized in that the weight ratio of the binder to the dry powder is 15-25: 100, respectively; for example, the weight ratio of the binder to the dry powder is 20-25: 100.
the method according to the second aspect of the present invention is characterized in that the binder is a mixture of a potassium-sodium ratio of 1-2: 1, for example, the binder is a mixture of sodium and potassium in a ratio of 1-1.5: 1, for example, a sodium-potassium ratio of 1: 1 of water glass.
The method according to the second aspect of the invention is characterized in that the binder potassium sodium silicate has a baume ° B (20 ℃) of 40.0 to 46.0, optionally the binder potassium sodium silicate has a modulus of 2.8 to 3.8. The adhesive potassium sodium silicate is colorless, slightly colored transparent or semitransparent thick liquid or glass block. The sodium potassium silicate of water glass is commercially available, and in the present invention, the water glass is commercially available unless otherwise specified; and in the specific examples, as not otherwise specified, the binder used is a mixture of potassium and sodium in a ratio of 1: 1 of water glass.
The method according to the second aspect of the present invention is characterized in that the fluorite is added in the form of dry-milled fluorite or in the form of flotation fluorite, and there is no difference in chemical composition between the fluorite and the dry-milled fluorite or the flotation fluorite, and there is no difference in effect when the method is applied to the present invention. In one embodiment, the main component of the fluorite is CaF2。
A method according to a second aspect of the invention, characterized in that the main component of the white corundum is Al2O3。
The method according to the second aspect of the present invention is characterized in that the magnesite is either sintered magnesite or fused magnesite, and the chemical composition of the magnesite and the fused magnesite is not different, and the effect of the method is not different. In one embodiment, the main component of the magnesite is MgO.
The method according to the second aspect of the invention is characterized in that the wollastonite contains calcium silicate as the main component, typically containing CaO and SiO2。
The method according to the second aspect of the invention is characterized in that the alloy powder is an alloy powder for balancing deposited metal components. In particular, the inconel powder includes, for example, 20 to 30% of nickel, 50 to 60% of chromium, and the balance of iron, and in the following examples, as not otherwise described, the alloy powder includes 23 to 27% of nickel, 53 to 57% of chromium, and the balance of iron.
According to a second aspect of the present invention, there is provided a method for manufacturing a sintered flux for submerged arc welding of a stainless steel wire electrode, the sintered flux having a particle size in the range of 20 to 80 mesh.
According to any aspect of the invention, the stainless steel wire electrode submerged arc welding low-temperature sintered flux has the mixture ratio of any embodiment of the invention.
Any embodiment of any aspect of the invention may be combined with other embodiments, as long as they do not contradict. Furthermore, in any embodiment of any aspect of the invention, any feature may be applicable to that feature in other embodiments, so long as they do not contradict.
The invention is further described below.
All documents cited herein are incorporated by reference in their entirety and to the extent such documents do not conform to the meaning of the present invention, the present invention shall control. Further, the various terms and phrases used herein have the ordinary meaning as is known to those skilled in the art, and even though such terms and phrases are intended to be described or explained in greater detail herein, reference is made to the term and phrase as being inconsistent with the known meaning and meaning as is accorded to such meaning throughout this disclosure.
The function of each component of the sintered flux for the stainless steel wire electrode submerged arc welding at low temperature is detailed as follows:
in general, the principal component CaF2The fluorite mainly has the functions of slagging, electric conduction and dehydrogenation, and is also the key for smoothly carrying out the electroslag process. With fluorite/CaF2The addition proportion is increased, the electrical conductivity of the slag is gradually increased, and when the electrical conductivity is increased to a certain degree, the generated resistance heat can ensure the rapid establishment of the electroslag process and the stability of an electroslag molten pool, thereby ensuring the stability of the whole electroslag welding process. But too much fluorite/CaF2The electrical conductivity is too high, the slag viscosity is reduced, the stability of electroslag welding is influenced, andand (4) weld bead forming quality.
Generally, Al is the main component2O3The white corundum is added to adjust the physical properties of the flux slag, adjust the electric arc and electroslag process in the welding process and improve the formation of slag shells and welding seams to a certain extent.
Generally, the main components comprise CaO and SiO2The wollastonite has the main functions of balancing the pH value of the flux and slagging. CaO can improve the alkalinity of welding slag and improve the mechanical property of deposited metal of the overlaying layer. SiO 22The alkalinity of the slag is reduced, but the slag has the functions of adjusting the fluidity of the slag, refining molten drops and improving the formation of welding seams.
Generally, magnesia, which is a main component of MgO, is mainly added as a slag former, and can improve the alkalinity of slag, increase the air permeability and surface tension of slag and improve the slag detachability of the flux.
In the present invention, the addition of alloy powder (e.g., nichrome powder, which is also referred to as nichrome powder in the present invention) has the effect of supplementing the dilution and burning loss of effective alloy elements.
In the invention, in order to ensure the quality of the welding flux, the binder adopts water glass with a potassium-sodium ratio of 1-2: 1, the Baume degree of the water glass is about 40-43 at room temperature, dry powder is subjected to wet mixing granulation, drying, screening, high-temperature sintering, cooling, lifting, screening and packaging to prepare the welding flux, and the granularity of the welding flux is controlled within the range of 20-80 meshes.
The invention relates to a sintered flux for stainless steel wire electrode submerged arc welding at low temperature, wherein the main component of the dry-milled fluorite used in the sintered flux is CaF2(ii) a The main component of the sintered magnesia is MgO; the main component of the white corundum is Al2O3(ii) a The wollastonite mainly comprises CaO and SiO2A composite compound of the composition.
The sintered flux is prepared by uniformly stirring the ingredients and water glass, granulating, drying and sintering. The sintered flux according to the present invention is prepared by mixing the batch components with water glass uniformly, granulating, drying, sieving, and sintering at 800 deg.C (e.g., sintering for 0.5-2 hours, e.g., about 1 hour) at 700-.
The nickel in the alloy powder used in the following examples of the invention is added in the form of metallic nickel, and the performance of the examples is examined at the performance of'd') at a welding speed of 12-15 m/h, and if the speed is increased, the weld forming property is obviously and adversely affected. The inventors of the present invention, referring to the experiments of examples 1 to 6 below, except that nickel in the alloy powder is changed to be added in the form of nickel nitride and the proportion of nickel in the alloy is not changed, have surprisingly found that the properties still reach the indexes of the fluxes of examples 1 to 6 under the condition of welding speed of 25 to 28m/h, for example, the tensile strength is 615R after referring to example 1 but nickel in the alloy powder is changed to nickel nitride powder with equal nickel amountmA tensile elongation (A/%) of 41 and an impact value (AK) at-196 deg.C under MPavThe value of/J) was 67. To this end, in one embodiment of the present invention, the nickel in the alloy powder is added in the form of metallic nickel nitride powder.
In order to improve the welding manufacturability of the weld metal at the low temperature of-196 ℃, the invention adopts the following main measures:
1. the main means for improving the low-temperature toughness of the weld metal at-196 ℃ is as follows: adding alloying elements to the flux to ensure reasonable alloying element transition in the weld joint and better control of ferrite content, wherein the addition of the alloying elements mainly prefers ferroalloy ferrochrome as a transition form because it is not decomposed during sintering, chromium-containing ferroalloy transfers carbon in a predictable manner, and nickel element is in a transition form of metal particles; the quality of raw materials is improved, harmful impurities brought by the raw materials are reduced, and the purity of a welding seam is improved; the formula can effectively inhibit harmful elements such as H, O from being transited to the welding seam, and effectively enhance the S, P removing effect of the welding seam.
2. The main means for improving the welding process performance are as follows: with MgO, Al2O3As a main slagging agent for adjusting the alkalinity, the alkalinity range of the welding flux is controlled to be 1.8-2.1, so that the welding flux has the advantage of good welding process performance of a low-alkalinity slag system. The formula of the invention can effectively improve the viscosity, surface tension, fluidity and the like of the slag, thereby improving the surface smoothness of the welding seamThe slag removing performance of slag shells and the surface quality of welding seams are ensured.
The technical solution of the present invention provides some obvious advantages and effects compared to the prior art, such as but not limited to at least one of the following:
1. the invention reasonably adjusts the proportion of each component of the welding flux, adopts a sintered welding flux system with moderate alkalinity, and better adjusts the viscosity, surface tension and fluidity of the slag, so that the electric arc combustion is stable in the welding process of the welding flux, the slag is easy to remove after welding, the edge of the welding bead is smooth in transition, and the welding process performance is also excellent under the harsh conditions of grooves, narrow gaps and the like.
2. The formula can effectively inhibit harmful elements such as H, O from being transited to the weld joint, has low S, P increment, ensures the purity of weld joint metal, little burning loss of austenite forming elements and the like, and improves the low-temperature impact toughness of the weld joint metal at-196 ℃.
3. The invention is matched with an ER308L welding wire, and because the welding seam has lower ferrite content, the welding seam metal has higher low-temperature impact toughness and Charpy impact value AKvThe average value at (-196 ℃) reaches 63J, and the impact value is stable.
Detailed Description
The present invention will be further described by the following examples, however, the scope of the present invention is not limited to the following examples. It will be understood by those skilled in the art that various changes and modifications may be made to the invention without departing from the spirit and scope of the invention. The present invention has been described generally and/or specifically with respect to materials used in testing and testing methods. Although many materials and methods of operation are known in the art for the purpose of carrying out the invention, the invention is nevertheless described herein in as detail as possible. The following examples further illustrate the invention without limiting it.
Example 1:
a) the proportion of the ingredients of the dry powder part of the welding flux is as follows:
27 parts of dry-milled fluorite, 22 parts of white corundum, 25 parts of sintered magnesia, 23 parts of wollastonite and 3 parts of alloy powder;
alloy powder: nickel 25%, chromium 56% and alloy powder;
binder water glass which accounts for 22% of dry powder weight, and the ratio of potassium to sodium is 1: 1. 43.2 ℃ Be (20 ℃), modulus 3.3.
b) Alkalinity of the flux: 2
c) The preparation method comprises the following steps: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material. The specific preparation method comprises the following steps: sieving the required raw materials according to the formula for proportioning weighing, after the total weight is rechecked, putting the dry powder into a dry mixer for dry mixing, after the dry mixing is even, putting the dry powder into a wet mixer, adding water glass for wet mixing, after the wet mixing is even, sending the wet powder into a granulating disc through a conveyor belt for granulation, after the granulation is finished, sending the wet powder into a drying furnace through the conveyor belt, drying for 45min at the temperature of 280 plus 290 ℃, removing the moisture, sieving the welding flux, sending the sieved welding flux in the standard granularity range into a sintering furnace, sintering for 1 h at the temperature of 730 plus 740 ℃, taking out the welding flux from the furnace, cooling, then sieving the welding flux (20-80 mesh particles), packaging and warehousing the welding flux with qualified granularity inspection, and finishing the production of the welding flux.
d) Performance inspection
The flux obtained in the present example was used in combination with an ER308L welding wire to conduct a welding test, wherein the steel sheet used for the test was 304 stainless steel and had a thickness of 20 mm; diameter of welding wire: 4.0 mm. The determination methods for various determination items are conventional in the art, and the specific methods and process parameters are shown in CN108057964A, especially in CN108057964A "table 2: the welding process parameter is' but the welding speed is reduced to 12-15 m/h. As a result: the welding process performance shows that the stability of a welding electroslag molten pool, the welding bead formability and the slag detachability are all excellent, no splashing condition occurs in a welding test, and the flatness of a lap joint is all excellent.
The chemical compositions (%) of the wire and deposited metal are as follows (with ER308L wire):
| C | Si | Mn | Cr | Ni | |
| composition of welding wire | 0.014 | 0.49 | 1.83 | 19.95 | 9.81 |
| Deposited metal composition | 0.019 | 0.632 | 1.308 | 19.05 | 10.21 |
The deposited metal mechanical properties (matched with ER308L welding wires) are as follows (all the results are determined by 5 times of tests):
| tensile Strength (R)m/Mpa) | Elongation (A/%) | Impact value (AK) at 196 ℃ below zerov/J) |
| 600 | 42 | 66 |
The tensile strength, elongation and impact value at-196 ℃ are respectively tested according to the following standards: GB/T12470-2018 stainless steel welding wire and flux for submerged arc welding.
Example 11:
CN102581518A (Chinese patent application No. 2012100794134, Jinwei) Specification [0153] Table 1 discloses 6 welding flux compositions of S1-S6, wherein the dosage of used white corundum is obviously lower than that of the invention, the dosage of wollastonite is obviously higher than that of the invention, and the used alloy powder is nickel alloy powder.
In this example 11, the inventor used 6 kinds of solder compositions S1-S6 of CN102581518A, CaF2By dry grinding fluorite, Al2O3Sintered magnesia, CaO and SiO for white corundum and MgO2The additive amount of wollastonite and alloy powder is changed to the additive amount of the invention in example 1, and the formulation and the preparation method of the invention in example 1 are referred to, 6 kinds of fluxes are obtained and are examined according to the performance examination of'd) performance examination of the invention in example 1 matched with an ER308L welding wire, and the results of the 6 kinds of fluxes are as follows:
tensile Strength (R)mA tensile strength/MPa of 490 to 520 and an elongation (A/%) of 31 to 34, and an impact value (AK) at-196 DEG CvThe result of the other parameters is equivalent to that of the example 1, and the obtained welding flux can not be applied to the application occasions of the invention after the proportion of the ingredients is properly changed.
Example 12:
CN108057964A (Chinese patent application No. 201711323063.0, Jinwei) specification, example 1, Table 1 discloses 5 welding flux compositions of N1-N5, wherein the used amount of fluorite is obviously higher than that of the invention, potassium fluoroaluminate is also used, and the used alloy powder is ferrocolumbium powder.
In this example 12, the inventor uses 5 kinds of flux compositions of N1-N5 of CN108057964A, the alloy powder is changed to the invention in the example 1, and the rest conditions refer to the formula and the preparation method of the invention in the example 1, and 5 kinds of fluxes are obtained and are examined according to the performance examination of'd) matching with ER308L welding wire' of the invention in the example 1, and the results of the 5 kinds of fluxes are as follows:
tensile Strength (R)ma/Mpa in the range of 470 to 510, an elongation (A/%) in the range of 32 to 36, and an impact value (AK) at-196 DEG CvThe results of the other parameters are equivalent to those of the example 1, and it can be seen that the obtained flux can not be applied to the application of the invention after the proportion of the ingredients is properly changed, for example, the results of the deposited metal mechanical properties (matching with ER308L welding wire) of the flux obtained by referring to N1 are shown in the following table:
| tensile Strength (R)m/Mpa) | Elongation (A/%) | Impact value (AK) at 196 ℃ below zerov/J) |
| 510 | 35 | 40、42、44、43、43 |
Example 2:
a) the proportion of the ingredients of the dry powder part of the welding flux is as follows:
25 parts of dry-milled fluorite, 25 parts of white corundum, 25 parts of sintered magnesia, 25 parts of wollastonite and 2 parts of alloy powder;
alloy powder: nickel 20%, chromium 59% and alloy powder;
the binder is sodium silicate, which accounts for 19 percent of the weight of dry powder, and the ratio of potassium to sodium is 2: 1. 40.4 ℃ Be (20 ℃), modulus 3.5.
b) Alkalinity of the flux: 1.9
c) The preparation method comprises the following steps: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material. The specific preparation method comprises the following steps: sieving the required raw materials according to the formula for proportioning weighing, after the total weight is rechecked, putting the dry powder into a dry mixer for dry mixing, after the dry mixing is uniform, putting the dry powder into a wet mixer, adding water glass for wet mixing, after the wet mixing is uniform, sending the wet powder into a granulation disc through a conveyor belt for granulation, after the granulation is finished, sending the wet powder into a drying furnace through the conveyor belt, drying for 30min at the temperature of 200 plus materials and 210 ℃, removing the moisture, sieving the welding flux, sending the sieved welding flux in the standard granularity range into a sintering furnace, sintering for 1 h at the temperature of 700 plus materials and 710 ℃, taking out the welding flux from the sintering furnace, cooling, then sieving the welding flux (20-80 mesh particles), packaging and warehousing the welding flux with qualified granularity inspection, and finishing the production.
d) Performance inspection
The flux obtained in the present example was used in combination with an ER308L welding wire to conduct a welding test, wherein the steel sheet used for the test was 304 stainless steel and had a thickness of 20 mm; diameter of welding wire: 4.0 mm. The determination method of various determination items is a conventional determination method in the field, and the specific method and process parameters are shown in CN 108057964A. As a result: the welding process performance shows that the stability of a welding electroslag molten pool, the welding bead formability and the slag detachability are all excellent, no splashing condition occurs in a welding test, and the flatness of a lap joint is all excellent.
When ER308L wire was used, the results of the chemical composition (%) of the wire and deposited metal were substantially the same as those of example 1, for example, the levels of Mn and Cr burn-out were substantially the same as those of example 1, and the transition contents of Si, C and Ni elements were substantially the same as those of example 1.
Tensile Strength (R) measured in accordance with example 1ma/Mpa in a range of 590 to 630 and an elongation (A/%) in a range of 40 to 45, and an impact value (AK) at-196 DEG Cvand/J) is within a range of 64 to 69.
Example 3:
a) the proportion of the ingredients of the dry powder part of the welding flux is as follows:
30 parts of dry-milled fluorite, 20 parts of white corundum, 20 parts of sintered magnesia, 20 parts of wollastonite and 4 parts of alloy powder;
alloy powder: 29% of nickel, 51% of chromium and 51% of alloy powder;
15% of binder water glass in dry powder weight, 1.5% of potassium-sodium ratio: 1. 45.7 ℃ Be (20 ℃) and a modulus of 3.1.
b) Alkalinity of the flux: 1.8
c) The preparation method comprises the following steps: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material. The specific preparation method comprises the following steps: sieving the required raw materials according to the formula for proportioning weighing, after the total weight is rechecked, putting the dry powder into a dry mixer for dry mixing, after the dry mixing is uniform, putting the dry powder into a wet mixer, adding water glass for wet mixing, after the wet mixing is uniform, sending the wet powder into a granulating disc through a conveyor belt for granulation, after the granulation is finished, sending the wet powder into a drying furnace through the conveyor belt, drying for 50min at the temperature of 320-.
d) Performance inspection
The flux obtained in the present example was used in combination with an ER308L welding wire to conduct a welding test, wherein the steel sheet used for the test was 304 stainless steel and had a thickness of 20 mm; diameter of welding wire: 4.0 mm. The determination method of various determination items is a conventional determination method in the field, and the specific method and process parameters are shown in CN 108057964A. As a result: the welding process performance shows that the stability of a welding electroslag molten pool, the welding bead formability and the slag detachability are all excellent, no splashing condition occurs in a welding test, and the flatness of a lap joint is all excellent.
When ER308L wire was used, the results of the chemical composition (%) of the wire and deposited metal were substantially the same as those of example 1, for example, the levels of Mn and Cr burn-out were substantially the same as those of example 1, and the transition contents of Si, C and Ni elements were substantially the same as those of example 1.
Tensile Strength (R) measured in accordance with example 1ma/Mpa in a range of 590 to 630 and an elongation (A/%) in a range of 40 to 45, and an impact value (AK) at-196 DEG Cvand/J) is within a range of 64 to 69.
Example 4:
a) the proportion of the ingredients of the dry powder part of the welding flux is as follows:
30 parts of dry-milled fluorite, 15 parts of white corundum, 35 parts of sintered magnesia, 10 parts of wollastonite and 5 parts of alloy powder;
alloy powder: nickel 23%, chromium 57% and alloy powder;
25% of binder water glass in dry powder weight, 1.2% of potassium-sodium ratio: 1. 44.1 ℃ Be (20 ℃) and a modulus of 2.3.
b) Alkalinity of the flux: 2.1
c) The preparation method comprises the following steps: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material. The specific preparation method comprises the following steps: sieving the required raw materials according to the formula for proportioning weighing, after the total weight is rechecked, putting the dry powder into a dry mixer for dry mixing, after the dry mixing is uniform, putting the dry powder into a wet mixer, adding water glass for wet mixing, after the wet mixing is uniform, sending the wet powder into a granulating disc through a conveyor belt for granulation, after the granulation is finished, sending the wet powder into a drying furnace through the conveyor belt, drying for 40min at 230 plus 240 ℃, removing the moisture, sieving the welding flux, sending the sieved welding flux in the standard granularity range into a sintering furnace, sintering for 50min at 720 plus 730 ℃, taking out the welding flux from the furnace, cooling, then sieving the welding flux (20-80 mesh particles), packaging and warehousing the welding flux with qualified granularity inspection, and finishing the production of the welding flux.
d) Performance inspection
The flux obtained in the present example was used in combination with an ER308L welding wire to conduct a welding test, wherein the steel sheet used for the test was 304 stainless steel and had a thickness of 20 mm; diameter of welding wire: 4.0 mm. The determination method of various determination items is a conventional determination method in the field, and the specific method and process parameters are shown in CN 108057964A. As a result: the welding process performance shows that the stability of a welding electroslag molten pool, the welding bead formability and the slag detachability are all excellent, no splashing condition occurs in a welding test, and the flatness of a lap joint is all excellent.
When ER308L wire was used, the results of the chemical composition (%) of the wire and deposited metal were substantially the same as those of example 1, for example, the levels of Mn and Cr burn-out were substantially the same as those of example 1, and the transition contents of Si, C and Ni elements were substantially the same as those of example 1.
Tensile Strength (R) measured in accordance with example 1ma/Mpa in a range of 590 to 630 and an elongation (A/%) in a range of 40 to 45, and an impact value (AK) at-196 DEG Cvand/J) is within a range of 64 to 69.
Example 5:
a) the proportion of the ingredients of the dry powder part of the welding flux is as follows:
15 parts of dry-milled fluorite, 30 parts of white corundum, 20 parts of sintered magnesia, 25 parts of wollastonite and 1 part of alloy powder;
alloy powder: 27% of nickel, 53% of chromium and 53% of alloy powder;
20% of binder water glass in dry powder weight, 1.5% of potassium-sodium ratio: 1. 41.7 ℃ Be (20 ℃), modulus 3.8.
b) Alkalinity of the flux: 2
c) The preparation method comprises the following steps: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material. The specific preparation method comprises the following steps: sieving the required raw materials according to the formula for proportioning weighing, after the total weight is rechecked, putting the dry powder into a dry mixer for dry mixing, after the dry mixing is uniform, putting the dry powder into a wet mixer, adding water glass for wet mixing, after the wet mixing is uniform, sending the wet powder into a granulation disc through a conveyor belt for granulation, after the granulation is finished, sending the wet powder into a drying furnace through the conveyor belt, drying for 45min at the temperature of 280 plus 290 ℃, removing the moisture, sieving the welding flux, sending the sieved welding flux in the standard granularity range into a sintering furnace, sintering for 45min at the temperature of 760 plus 770 ℃, taking out the welding flux from the furnace, cooling, then sieving the welding flux (20-80 mesh particles), packaging and warehousing the welding flux with qualified granularity inspection, and finishing the production of the welding flux.
d) Performance inspection
The flux obtained in the present example was used in combination with an ER308L welding wire to conduct a welding test, wherein the steel sheet used for the test was 304 stainless steel and had a thickness of 20 mm; diameter of welding wire: 4.0 mm. The determination method of various determination items is a conventional determination method in the field, and the specific method and process parameters are shown in CN 108057964A. As a result: the welding process performance shows that the stability of a welding electroslag molten pool, the welding bead formability and the slag detachability are all excellent, no splashing condition occurs in a welding test, and the flatness of a lap joint is all excellent.
When ER308L wire was used, the results of the chemical composition (%) of the wire and deposited metal were substantially the same as those of example 1, for example, the levels of Mn and Cr burn-out were substantially the same as those of example 1, and the transition contents of Si, C and Ni elements were substantially the same as those of example 1.
Tensile Strength (R) measured in accordance with example 1ma/Mpa in a range of 590 to 630 and an elongation (A/%) in a range of 40 to 45, and an impact value (AK) at-196 DEG Cvand/J) is within a range of 64 to 69.
Example 6:
a) the proportion of the ingredients of the dry powder part of the welding flux is as follows:
26 parts of dry-milled fluorite, 25 parts of white corundum, 22 parts of sintered magnesia, 24 parts of wollastonite and 3 parts of alloy powder;
alloy powder: 26% of nickel, 56% of chromium and 56% of alloy powder;
20% of binder water glass in dry powder weight, 1.2% of potassium-sodium ratio: 1. 42.1 ℃ Be (20 ℃) and a modulus of 3.2.
b) Alkalinity of the flux: 1.9
c) The preparation method comprises the following steps: the preparation method comprises the steps of uniformly mixing dry powder materials according to the proportion, adding water glass, carrying out wet mixing, then carrying out granulation, drying at the low temperature of 200-330 ℃ for 30-50 min, screening, sintering at the high temperature of 700-800 ℃ for 45-60min, cooling and screening to obtain the material. The specific preparation method comprises the following steps: sieving the required raw materials according to the formula for proportioning weighing, re-testing the total weight, then putting dry powder into a dry mixer for dry mixing, putting the dry powder into a wet mixer after the dry mixing is uniform, adding water glass for wet mixing, sending the wet powder into a granulating disc for granulation through a conveyor belt after the wet mixing is uniform, sending the wet powder into a drying furnace through the conveyor belt after the granulation is finished, drying for 50min at the temperature of 270 plus 280 ℃, removing the moisture, sieving the welding flux, sending the sieved welding flux in the standard granularity range into a sintering furnace, sintering for 45min at the temperature of 760 plus 765 ℃, taking out the welding flux from the sintering furnace, cooling, then sieving the welding flux (20-80 mesh particles), packaging and warehousing the welding flux with qualified granularity inspection, and finishing the production of the welding flux.
d) Performance inspection
The flux obtained in the present example was used in combination with an ER308L welding wire to conduct a welding test, wherein the steel sheet used for the test was 304 stainless steel and had a thickness of 20 mm; diameter of welding wire: 4.0 mm. The determination method of various determination items is a conventional determination method in the field, and the specific method and process parameters are shown in CN 108057964A. As a result: the welding process performance shows that the stability of a welding electroslag molten pool, the welding bead formability and the slag detachability are all excellent, no splashing condition occurs in a welding test, and the flatness of a lap joint is all excellent.
When ER308L wire was used, the results of the chemical composition (%) of the wire and deposited metal were substantially the same as those of example 1, for example, the levels of Mn and Cr burn-out were substantially the same as those of example 1, and the transition contents of Si, C and Ni elements were substantially the same as those of example 1.
Tensile Strength (R) measured in accordance with example 1ma/Mpa in a range of 590 to 630 and an elongation (A/%) in a range of 40 to 45, and an impact value (AK) at-196 DEG Cv/J) is in the range of 64 to 69Inside the enclosure.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (14)
1. The sintered flux for the submerged arc welding of the stainless steel wire electrode at low temperature is prepared from dry powder of various components and a binder, namely water glass, and is characterized in that the dry powder comprises the following components in parts by weight: 15-30 parts of fluorite, 15-30 parts of white corundum, 20-35 parts of magnesia, 10-25 parts of wollastonite and 1-5 parts of alloy powder; the weight ratio of the binder to the dry powder is 15-25: 100, respectively; the binder is prepared by mixing a raw material with a potassium-sodium ratio of 1-2: 1 of water glass; the alloy powder is nickel-chromium-iron alloy powder for balancing deposited metal components, and comprises 20-30% of nickel, 50-60% of chromium and the balance of iron, wherein the nickel is added in the form of nickel nitride powder.
2. The sintered flux for stainless steel wire electrode submerged arc welding at low temperature according to claim 1, wherein the dry powder comprises the following components in parts by weight: 25-30 parts of fluorite, 20-25 parts of white corundum, 20-25 parts of magnesia, 20-25 parts of wollastonite and 2-4 parts of alloy powder.
3. The sintered flux for low-temperature stainless steel wire electrode submerged arc welding according to claim 1, wherein the dry powder comprises the following components in any one of the following proportions by weight 1 to 6:
proportioning 1: 27 parts of dry-milled fluorite, 22 parts of white corundum, 25 parts of sintered magnesia, 23 parts of wollastonite and 3 parts of alloy powder;
and (2) proportioning: 25 parts of dry-milled fluorite, 25 parts of white corundum, 25 parts of sintered magnesia, 25 parts of wollastonite and 2 parts of alloy powder;
proportioning 3: 30 parts of dry-milled fluorite, 20 parts of white corundum, 20 parts of sintered magnesia, 20 parts of wollastonite and 4 parts of alloy powder;
and (4) proportioning: 30 parts of dry-milled fluorite, 15 parts of white corundum, 35 parts of sintered magnesia, 10 parts of wollastonite and 5 parts of alloy powder;
and (2) proportioning 5: 15 parts of dry-milled fluorite, 30 parts of white corundum, 20 parts of sintered magnesia, 25 parts of wollastonite and 1 part of alloy powder;
proportioning 6: 26 parts of dry-milled fluorite, 25 parts of white corundum, 22 parts of sintered magnesia, 24 parts of wollastonite and 3 parts of alloy powder.
4. The sintered flux for low-temperature stainless steel wire extreme submerged arc welding according to claim 1, wherein the weight ratio of the binder to the dry powder is 20 to 25: 100.
5. the sintered flux for low-temperature stainless steel wire extreme submerged arc welding according to claim 1, wherein the binder is a mixture of a binder having a potassium-sodium ratio of 1 to 1.5: 1 of water glass.
6. The sintered flux for low-temperature submerged arc welding for stainless steel wire according to claim 1, characterized in that said binder is a sintered flux having a potassium-sodium ratio of 1: 1 of water glass.
7. The sintered flux for low temperature submerged arc welding of stainless steel wires according to claim 1, characterized in that the binder sodium potassium silicate has a baume ° be of 40.0-46.0, measured at 20 ℃.
8. The sintered flux for low temperature use for stainless steel wire extreme submerged arc welding according to claim 1, characterized in that said binder sodium potassium silicate has a modulus of 2.8-3.8.
9. The sintered flux for low-temperature submerged arc welding of a stainless steel wire according to claim 1, wherein the alloy powder is an alloy powder containing 23 to 27% of nickel, 53 to 57% of chromium, and the balance being iron.
10. The sintered flux for low-temperature submerged arc welding of stainless steel wire according to claim 1, characterized in that it is prepared by a method comprising the steps of: the dry powder materials proportioned according to the proportion are uniformly mixed, added with water glass, subjected to wet mixing, granulated, dried at the low temperature of 200-330 ℃ for 30-50 min, screened, sintered at the high temperature of 700-800 ℃ for 45-60min, cooled and screened to obtain the material.
11. The sintered flux for low-temperature submerged arc welding of a stainless steel wire according to claim 1, wherein the particle size is in the range of 20 to 80 mesh.
12. The sintered flux for low-temperature submerged arc welding of stainless steel wire according to claim 1, characterized in that it is a flux for use with ER308L welding wire.
13. The sintered flux for low-temperature submerged arc welding of stainless steel wire according to claim 1, characterized in that its basicity is in the range of 1.8 to 2.1.
14. A method for preparing the sintered flux for stainless steel wire extreme submerged arc welding at low temperature according to any one of claims 1 to 13, comprising the steps of: the dry powder materials proportioned according to the proportion are uniformly mixed, added with water glass, subjected to wet mixing, granulated, dried at the low temperature of 200-330 ℃ for 30-50 min, screened, sintered at the high temperature of 700-800 ℃ for 45-60min, cooled and screened to obtain the material.
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| CN111037155B (en) * | 2019-12-31 | 2020-09-08 | 四川西冶新材料股份有限公司 | 850 MPa-grade weather-proof high-strength steel matched submerged-arc welding flux |
| CN111761259A (en) * | 2020-06-24 | 2020-10-13 | 中国船舶重工集团公司第七二五研究所 | Preparation method of sintered flux capable of reducing apparent density |
| CN113146096B (en) * | 2021-03-03 | 2022-07-15 | 北京金威焊材有限公司 | Welding strip for nickel-saving high-nitrogen austenitic stainless steel strip electrode surfacing, matched welding agent and preparation method of welding strip |
| CN113770591B (en) * | 2021-10-13 | 2023-01-31 | 北京金威焊材有限公司 | Flux-cored wire for welding stainless steel used in high-temperature environment |
| CN114101973B (en) * | 2021-12-10 | 2023-01-31 | 北京金威焊材有限公司 | Alkaline coated stainless steel electrode |
| CN114850724B (en) * | 2022-06-17 | 2023-06-23 | 中国船舶重工集团公司第七二五研究所 | High-alkalinity sintered flux for submerged arc welding of austenitic low-temperature steel and preparation method thereof |
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| CN102581518B (en) * | 2012-03-23 | 2014-10-15 | 北京金威焊材有限公司 | Sintered flux for stainless steel surfacing with band electrode |
| CN103464931B (en) * | 2013-08-14 | 2015-11-18 | 中国船舶重工集团公司第七二五研究所 | A kind of high-toughness submerged arc welding sintered flux and preparation method |
| CN106736044A (en) * | 2016-12-29 | 2017-05-31 | 上海沪临重工有限公司 | A kind of small groove submerged arc flux of hull steel and preparation method thereof |
| CN108015453A (en) * | 2017-12-05 | 2018-05-11 | 河南科技大学 | A kind of nickel-base alloy submerged-arc welding sintered flux and preparation method and application |
| CN108057964B (en) * | 2017-12-12 | 2020-05-26 | 北京金威焊材有限公司 | Sintered flux for submerged arc welding of nickel-based filament |
| CN108838581A (en) * | 2018-09-13 | 2018-11-20 | 郑州凤凰新材料科技有限公司 | A kind of sintered flux for stainless steel and preparation method thereof |
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