CN112692465B - Low-density surfacing flux with long-fiber wollastonite as frame and preparation method thereof - Google Patents
Low-density surfacing flux with long-fiber wollastonite as frame and preparation method thereof Download PDFInfo
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- CN112692465B CN112692465B CN202110319627.3A CN202110319627A CN112692465B CN 112692465 B CN112692465 B CN 112692465B CN 202110319627 A CN202110319627 A CN 202110319627A CN 112692465 B CN112692465 B CN 112692465B
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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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- 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 relates to the field of surfacing welding fluxes, and provides a low-density surfacing welding flux taking long-fiber wollastonite as a frame and a preparation method thereof, wherein the low-density surfacing welding flux comprises the following raw materials in percentage by mass: 40-45% of long fiber wollastonite, 23-27% of alumina, 10-14% of fluorite, 12-15% of potassium feldspar, 2-3% of Cr powder, 1-2% of Mn powder and 1-2% of SiFe. Also provides a preparation method of the low-density surfacing flux taking long-fiber wollastonite as a frame. The low-density surfacing flux with the long fiber wollastonite as the frame, which is produced by the invention, has lower original bulk density, thereby having good welding process performance; the preparation method of the low-density surfacing flux with the long fiber wollastonite as the frame can prepare the flux with proper bonding strength and higher abrasion resistance, and can better meet higher process requirements in the production, transportation and application processes.
Description
Technical Field
The invention relates to the field of surfacing welding fluxes, in particular to a low-density surfacing welding flux taking long-fiber wollastonite as a frame and a preparation method thereof.
Background
The stainless steel band electrode submerged arc surfacing is the most common technology of a corrosion-resistant layer surfacing material in nuclear, petrochemical and chemical containers; through the stainless steel welding strip that uses different width (15 ~120 mm), cooperation stainless steel band pole build-up welding flux, can obtain smooth large width build-up welding bead, realize the quick large tracts of land build-up welding of pressure vessel stainless steel corrosion-resistant layer. The types of common stainless steel welding strips and corrosion resistant layers are austenitic stainless steel and duplex stainless steel such as 309L, 308L, 309LMo, 316L, 309LNb, 347, 2209 and the like, and the welding line composition and the corrosion resistance requirements are different; however, in all the stainless steel strip surfacing processes, the formation of a smooth bead and the formation defects such as undercut and indentation during continuous lapping are not caused, and the most important technical requirements are for the stainless steel strip surfacing flux.
The density of the flux pile can directly influence the manufacturability of stainless steel strip surfacing; the effect of the larger flux bulk density on the stainless steel strip surfacing is as follows: the width of a welding bead becomes narrow, and the flatness of the welding bead is poor; in the width direction of the welding bead, the center is concave, the edges of two sides are convex, and the cross section of the surfacing layer which is similar to the cross section of the low middle part of the M-shaped drum at two sides is not beneficial to surfacing surface flatness; secondly, the wettability between the surfacing metal and the base metal is poor; the wetting angle is increased, and the defects of non-fusion and undercut are easily formed during the next lapping.
The Chinese patent application No. 2020105842618 discloses a preparation method of a sintered flux capable of reducing loose packing density, which is characterized in that 2-6% of cellulose (the cellulose is totally called as sodium carboxymethylcellulose in the welding material industry) is added into the flux, the flux is fluffed by utilizing the characteristic of water absorption and expansion of the cellulose, and the cellulose is decomposed (the decomposition temperature is 200-300 ℃) into gas through the subsequent high-temperature sintering process (the sintering temperature is more than or equal to 500 ℃) of the flux to reduce the density of the flux. However, cellulose is a soft organic fiber, which rapidly loses the fiber characteristics after absorbing water and expanding in the powder mixing process to become semitransparent soft jelly, has good viscosity, and can tightly adsorb fine powder granular raw materials and rapidly form compact flux particles in a granulation rolling ring section of the flux, so that too much large-particle flux can be formed after a little long granulation time, and the arc stability of the flux is poor. Further, the chemical component of cellulose is [ C ]6H7O2(OH)2OCH2COONa]n is an organic matter containing a large amount of C and H, for stainless steel surfacing, C and H are mainly harmful elements, C is an impurity element which has the largest influence on the intercrystalline corrosion performance of stainless steel, and the C content in the stainless steel corrosion-resistant surfacing layer is generally required to be not more than 0.04%; h, in the welding process, the content of diffusible hydrogen in a welding seam and a heat affected zone of a welding area is increased, the plasticity of a surfacing layer is reduced, and the defect sensitivity of welding pores and cracks is increased; therefore, this way of adding C and H additionally is not advantageous for the manufacture of stainless steel build-up products requiring ultra low carbon.
In addition, in this patent, the granulation time is controlled within 1min to reduce the bonding strength between the raw material fine powder particles and to control the granulation density of the particles. Other published papers and other references also mention adjusting the rotation angle and rotation time of the granulating pan, or using process variations such as vibration granulation to reduce the degree of compaction of the flux particles. However, these measures have caused problems that powder materials of the flux raw materials are mutually agglomerated and loosened, and the cohesive strength is insufficient. The particle strength of the welding flux is not enough, so that the welding flux particles are easy to collide and break in the production, transportation and application processes, the amount of generated fine powder is obviously increased, the air permeability and the electric arc stability of the welding flux are influenced, gas indentations are easy to generate on the surface of a welding bead, and the welding flux is not suitable for a stainless steel strip surfacing technology with high technological requirements.
Disclosure of Invention
The first object of the present invention is to provide a low-density surfacing flux framed with long-fiber wollastonite, which has a low initial bulk density and thus good welding process properties.
The second purpose of the invention is to provide a method for preparing the low-density surfacing welding flux taking long fiber wollastonite as a frame, which can prepare the flux with proper bonding strength and higher abrasion resistance and better meet higher process requirements in the processes of production, transportation and application.
The embodiment of the invention is realized by the following technical scheme:
the low-density surfacing welding flux with long fiber wollastonite as a frame and the preparation method thereof comprise the following raw materials in percentage by mass: 40-45% of long fiber wollastonite, 23-27% of alumina, 10-14% of fluorite, 12-15% of potassium feldspar, 2-3% of Cr powder, 1-2% of Mn powder and 1-2% of SiFe.
The size and shape of the individual particles of long fiber wollastonite used in the present invention are: a long and thin rod-like shape with a length of 500-1000 μm and a length-diameter ratio (length/diameter) of 10:1 or more. When the size and the shape of the single particle of the long fiber wollastonite are within the range, the long and thin rod-shaped long fiber wollastonite particles can be crossed and overlapped to form a three-dimensional frame structure, so that other fine powder granular raw materials are filled among pores of the three-dimensional frame structure, and the fine powder granular raw materials are delayed to be agglomerated together to form the self-agglomeration, thereby leading the original bulk density of the welding flux to be lower; the structure schematic diagram of the low-density surfacing flux taking long-fiber wollastonite as a frame is shown in FIG. 1;
if the length of a single particle of the long-fiber wollastonite is shortened and the length-diameter ratio is reduced, the long-rod-shaped long-fiber wollastonite particles are crossed and overlapped with each other and have reduced frame forming capability in the granulation process of the long-fiber wollastonite, the functions of absorbing other fine powder granular raw materials and delaying agglomeration of the fine powder granular raw materials are weakened, and the goal of reducing the original bulk density of the welding flux cannot be achieved; if the length of the individual particles of the long-fiber wollastonite is further increased to make the number of large particles in the flux too large, the large-particle flux melts more slowly during welding, and the arc stability and slag fluidity of the flux are affected, so that stable weld formation cannot be obtained.
The mass percentage of the long fiber wollastonite is 40-45%, the structural characteristics of the long fiber wollastonite are used for building a welding flux frame structure, and the chemical component CaSiO of the long fiber wollastonite is3Important slag former for welding flux; if the content of the fine powder is reduced and the proportion of the fine powder in the raw materials is correspondingly reduced, the probability that long-fiber wollastonite particles are crossed and overlapped to form a frame is reduced in the granulation process, the action of absorbing the fine powder granular raw materials and delaying agglomeration of the fine powder granular raw materials is weakened, and the original bulk density of the welding flux cannot be reduced; if the content is too high, wollastonite (CaSiO) is excessively increased3) After melting, SiO in the flux can be generated2Too high content of (b) causes a severe slag adhesion phenomenon on the surface of the weld bead.
In the invention, the alumina is used for slagging and adjusting the melting point, so that the forming straightness of strip surfacing can be improved; fluorite is used for slag thinning and dehydrogenation, so that the probability of generating pressing pits on the surface of the surfacing layer is reduced.
The potassium feldspar has a slagging effect, contains high-content potassium, has low ionization potential and has a good arc stabilizing effect; because the particle size of the long fiber wollastonite is larger than that of the raw material of the common wollastonite, and the content proportion of the long fiber wollastonite used in the invention is higher than that of the common wollastonite in the common welding flux, the welding flux has slow melting speed and less conductive particles in an arc space, and at the moment, the arc stabilizing effect is compensated by higher content of potassium, so that the welding flux has good arc stability.
The Cr powder, the Mn powder and the SiFe alloy raw materials are used cooperatively, so that the burning loss of the alloy in the stainless steel strip surfacing process can be compensated, the deoxidation in the welding process can be realized, and the purity of deposited metal is ensured.
Further, the preparation method of the low-density surfacing flux taking long fiber wollastonite as a frame comprises the following steps:
s1: uniformly mixing the raw materials according to a proportion, adding pure potassium water glass, and uniformly stirring, wherein the adding weight of the pure potassium water glass is 20-25% of the total weight of the raw materials, so as to obtain a mixed raw material;
s2: and (3) rolling and granulating the prepared mixed raw materials for 5-8 min by using a swash plate, and then sequentially drying at a low temperature of 120-160 ℃, sieving, crushing and drying at a high temperature of 650-720 ℃ for more than 1h to obtain the finished flux.
The invention uses pure potassium water glass as the binder, not only plays the role of the binder, but also compensates partial arc stability sacrificed by using the long fiber wollastonite with larger size and higher content in the invention by considering that the potassium has good arc stability, so that the welding flux has good arc stability.
The invention uses the swash plate to carry out rolling granulation, and the long fiber wollastonite used by the invention forms a stable frame structure, and other fine powder granular raw materials are stably contained between the pores of the frame structure, and the stress points of mutual collision mainly act on the protruded long fiber wollastonite frame in the rolling granulation process, so that the fine powder granular raw materials can be prevented from further moving and self-agglomerating, and the process of rapidly increasing the flux bulk density is effectively delayed in a granulation process link which has the greatest influence on the flux bulk density and is difficult to control.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. in the invention, the long and thin rod-shaped long fiber wollastonite with the single particle length of 500-1000 microns and the length-diameter ratio (length/diameter) of more than or equal to 10:1 is prepared and used, the content of the long and thin rod-shaped long fiber wollastonite reaches 40-45%, and in the granulation process, the long and thin rod-shaped long fiber wollastonite particles are mutually crossed and overlapped to form a frame structure, so that other fine powder granular raw materials are filled among pores of the long fiber wollastonite frame structure, and the original bulk density of the welding flux is lower.
2. The swash plate rolling granulation of the invention effectively prevents self agglomeration of other fine powder particle raw materials on the basis that long fiber wollastonite forms a stable frame structure, delays the increasing rate of the bulk density of the welding flux and ensures that the low bulk density of the welding flux is completely controlled.
3. The melting point of the long fiber wollastonite is more than 1500 ℃, and the invention uses the high temperature of 650-720 ℃ to dry the flux particles for more than 1 hour during the preparation of the flux without damaging the fiber structure of the flux particles; and the frame structure formed by the long fiber wollastonite has good structural strength and better abrasion resistance under the mutual restraint of the fibers; during production, transportation and application processes, or during recovery and reuse of the flux, the flux is not easy to be pulverized to form fine powder, and during the use of stainless steel strip surfacing, gas indentation on the surface of a weld bead caused by excessive fine powder in the flux can be avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a low-density surfacing flux using long-fiber wollastonite as a frame according to an embodiment of the present invention;
FIG. 2 is a graph showing the results of Experimental example 2 of the present invention.
Reference numerals: 1-long fiber wollastonite particles; 2-other finely divided particulate materials.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following is a detailed description of the low-density build-up welding flux using long-fiber wollastonite as a frame and the method for preparing the same according to the embodiment of the present invention.
The low-density surfacing flux with the long fiber wollastonite as the frame comprises the following raw materials in percentage by mass: 40-45% of long fiber wollastonite, 23-27% of alumina, 10-14% of fluorite, 12-15% of potassium feldspar, 2-3% of Cr powder, 1-2% of Mn powder and 1-2% of SiFe.
Wherein the chemical components are selected to meet the following chemical components in percentage by mass: 42-52% CaO, 45-50% SiO2Mechanically crushing wollastonite raw ore with MgO less than or equal to 2%, S less than or equal to 0.03% and P less than or equal to 0.03% to obtain particles with the particle size of 2-5 mm, processing the particles by an air flow mill to form long and thin rod-shaped long fiber wollastonite with the length-diameter ratio of more than or equal to 10:1, and screening the long fiber wollastonite by a rectangular hole type screen.
Wherein, the alumina satisfies the chemical composition comprising the following mass percent: al (Al)2O3More than or equal to 99 percent, less than or equal to 0.03 percent of S and less than or equal to 0.03 percent of P; the fluorite comprises the following chemical components in percentage by mass: CaF2More than or equal to 96 percent, S less than or equal to 0.03 percent and P less than or equal to 0.03 percent; the potassium feldspar comprises the following chemical components in percentage by mass: k2O≥10%，Al2O3Not less than 18% and SiO2More than or equal to 60 percent; the screening granularity of the alumina, the fluorite and the potassium feldspar is 60 meshes.
The Cr powder comprises the following chemical components in percentage by mass: cr is more than or equal to 98 percent, S is less than or equal to 0.03 percent and P is less than or equal to 0.01 percent; the Mn powder comprises the following chemical components in percentage by mass: mn is more than or equal to 98 percent, S is less than or equal to 0.03 percent and P is less than or equal to 0.01 percent; the SiFe satisfies the following chemical components in percentage by mass: 42-47% of Si, less than or equal to 0.03% of S and less than or equal to 0.04% of P; the screening granularity of the Cr powder, the Mn powder and the SiFe is 80 meshes.
The preparation method of the low-density surfacing flux taking long fiber wollastonite as a frame comprises the following steps:
s1: uniformly mixing the raw materials according to a proportion, adding pure potassium water glass, and uniformly stirring, wherein the adding weight of the pure potassium water glass is 20-25% of the total weight of the raw materials, so as to obtain a mixed raw material;
s2: and (3) rolling and granulating the prepared mixed raw materials through a rotating swash plate, subsequently drying at low temperature of 120-160 ℃, sieving the granules of the broken welding flux to obtain granules with the granularity of 8-40 meshes, and drying at high temperature of 650-720 ℃ to obtain the finished welding flux.
Example 1
The embodiment provides a low-density surfacing flux taking long-fiber wollastonite as a frame, which comprises the following raw materials in percentage by mass: 41 percent of long-fiber wollastonite, 25 percent of alumina, 13 percent of fluorite, 15 percent of potassium feldspar, 3 percent of Cr powder, 1.5 percent of Mn powder and 1.5 percent of SiFe.
Wherein the prepared long fiber wollastonite is a slender rod with the length of 500 mu m and the length-diameter ratio of more than or equal to 10: 1.
The embodiment also provides a preparation method of the low-density surfacing flux taking long-fiber wollastonite as a frame, which comprises the following steps:
s1: uniformly mixing the raw materials according to a proportion, adding pure potassium water glass, and uniformly stirring, wherein the adding weight of the pure potassium water glass is 22% of the total weight of the raw materials, so as to obtain a mixed raw material;
s2: and (3) rolling and granulating the prepared mixed raw material by a rotating swash plate, subsequently drying at low temperature of 120 ℃, sieving broken flux particles with a granularity of 30 meshes, and drying at high temperature of 720 ℃ for 1h to obtain the finished flux.
Example 2
The embodiment provides a low-density surfacing flux taking long-fiber wollastonite as a frame, which comprises the following raw materials in percentage by mass: 45% of long-fiber wollastonite, 25% of alumina, 13% of fluorite, 12% of potassium feldspar, 3% of Cr powder, 1% of Mn powder and 1% of SiFe.
Wherein the prepared long fiber wollastonite is a slender rod with the length of 1000 microns and the length-diameter ratio of more than or equal to 10: 1.
The embodiment also provides a preparation method of the low-density surfacing flux taking long-fiber wollastonite as a frame, which comprises the following steps:
s1: uniformly mixing the raw materials according to a proportion, adding pure potassium water glass, and uniformly stirring, wherein the adding weight of the pure potassium water glass is 20% of the total weight of the raw materials, so as to obtain a mixed raw material;
s2: and (3) rolling and granulating the prepared mixed raw material by a rotating swash plate, subsequently drying at low temperature of 140 ℃, sieving the crushed flux particles to obtain a granularity of 40 meshes, and drying at high temperature of 650 ℃ for 1h to obtain the finished flux.
Example 3
The embodiment provides a low-density surfacing flux taking long-fiber wollastonite as a frame, which comprises the following raw materials in percentage by mass: 40% of long-fiber wollastonite, 27% of alumina, 14% of fluorite, 13% of potassium feldspar, 2% of Cr powder, 2% of Mn powder and 2% of SiFe.
Wherein the prepared long fiber wollastonite is a slender rod with the length of 800 mu m and the length-diameter ratio of more than or equal to 10: 1.
The embodiment also provides a preparation method of the low-density surfacing flux taking long-fiber wollastonite as a frame, which comprises the following steps:
s1: uniformly mixing the raw materials according to a proportion, adding pure potassium water glass, and uniformly stirring, wherein the adding weight of the pure potassium water glass is 25% of the total weight of the raw materials, so as to obtain a mixed raw material;
s2: and (3) rolling and granulating the prepared mixed raw material by a rotating swash plate, subsequently drying at low temperature of 160 ℃, sieving the crushed flux particles to obtain a granularity of 8 meshes, and drying at high temperature of 700 ℃ for 1.5 hours to obtain the finished flux.
Comparative example
The comparative example provides a stainless steel surfacing welding flux which comprises the following raw materials in percentage by mass: 41% of wollastonite powder, 25% of alumina, 13% of fluorite, 15% of potassium feldspar, 3% of Cr powder, 1.5% of Mn powder and 1.5% of SiFeI.
Wherein, the wollastonite powder is common wollastonite fine powder which is generally used in the industry and passes through a 40-mesh sieve.
The comparative example also provides a preparation method of the stainless steel surfacing welding flux, which comprises the following steps:
s1: uniformly mixing the raw materials according to a proportion, adding pure potassium water glass, and uniformly stirring, wherein the adding weight of the pure potassium water glass is 22% of the total weight of the raw materials, so as to obtain a mixed raw material;
s2: and (3) rolling and granulating the prepared mixed raw material by a rotating swash plate, subsequently drying at low temperature of 120 ℃, sieving broken flux particles with a granularity of 30 meshes, and drying at high temperature of 720 ℃ for 1h to obtain the finished flux.
Experimental example 1
Taking 6 samples of the low-density surfacing welding flux taking long fiber wollastonite as a frame prepared in the examples 1-3 and the welding flux prepared in the comparative example, and carrying out part 1 of the test of the physical properties of the granular materials according to GB/T31057.1-2014: measurement of apparent Density the flux bulk density of each sample was measured and the average value was calculated, and the results are shown in Table 1.
TABLE 1 average bulk density of the fluxes
| Test specimen | Flux bulk Density (g/cm 3) |
| Example 1 | 0.90 |
| Example 2 | 0.91 |
| Example 3 | 0.93 |
| Comparative example | 1.20 |
As can be seen from table 1: the low-density surfacing flux prepared in the embodiments 1 to 3 and using the long fiber wollastonite as a frame has a low initial pair bulk density; examples 1-3 used long fiber wollastonite, while the comparative example used ordinary wollastonite powder; that is, the present invention aims to reduce the initial bulk density of a flux for low-density build-up welding using long-fiber wollastonite prepared by using the long-fiber wollastonite as a frame.
Experimental example 2
The low-density build-up welding flux using long fiber wollastonite as a frame prepared in example 1 and the flux prepared in comparative example were mixed with a stainless steel band electrode build-up welding band 309L of 50 × 0.5mm, and flux manufacturability tests were compared, using welding parameters: the current 680A, the voltage 28V and the welding speed 17 cm/min. The forming pattern of the stainless steel weld joint after overlaying is shown in fig. 2, and the forming parameters are shown in table 2.
TABLE 2 build-up welding shaping parameters
| Test specimen | Bead width w (mm) | Bead height h (mm) | Edge wetting angle theta (degree) | Surface unevenness (mm) |
| Example 1 | 55 | 3.5 | 40 | 0.5 |
| Comparative example | 52 | 3.8 | 65 | 1.1 |
As can be seen from fig. 2 and table 2: the low-density surfacing flux which takes long fiber wollastonite as a frame and is prepared in the embodiment 1 has the advantages of large welding bead width, good flatness and better wettability of the edge of the welding bead on welding manufacturability, and can not form a welding bead which is similar to M-shaped and is concave in the high center of the edge; example 1 uses long fiber wollastonite while the comparative example uses ordinary wollastonite powder; that is, the long fiber wollastonite-based low-density overlay welding flux prepared by using the long fiber wollastonite exhibits good manufacturability during welding due to its low initial bulk density.
Experimental example 3
The low-density surfacing flux taking long fiber wollastonite as a frame prepared in the example 1 and the flux prepared in the comparative example are respectively taken for 20kg, packaged in an iron drum packaging mode in the industry, then placed on the same vibration platform, vibrated for 10min, and the inevitable collision and friction of the finished flux in the transportation process and the use process are simulated. After the test, the flux was poured out, fine powder of 40 mesh or less was sieved out, and the weight of the sieved fine powder was measured. The results are shown in Table 3.
TABLE 3 fine powder weight after vibratory friction of flux
| Test specimen | Sieving to obtain fine powder (kg) of less than 40 meshes |
| Example 1 | 0.4 |
| Comparative example | 0.7 |
As can be seen from table 3: the low-density surfacing flux taking long-fiber wollastonite as a frame, prepared in the embodiment 1, has better abrasion resistance and less weight of screened fine powder; example 1 uses long fiber wollastonite while the comparative example uses ordinary wollastonite powder; that is, the present invention provides a stable long fiber wollastonite frame structure by using a long fiber wollastonite prepared by using a low density build-up welding flux having a long fiber wollastonite frame, and has a good abrasion resistance by stably housing other fine powder granular raw materials between pores of the long fiber wollastonite frame structure.
In summary, the long fiber wollastonite forms a stable frame structure, and other fine powder granular raw materials are stably accommodated between the pores of the frame structure, so that the low-density surfacing flux using the long fiber wollastonite as the frame has low original bulk density, and has good welding process performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The low-density surfacing welding flux taking long fiber wollastonite as a frame is characterized by comprising the following raw materials in percentage by mass: 40-45% of long fiber wollastonite, 23-27% of alumina, 10-14% of fluorite, 12-15% of potassium feldspar, 2-3% of Cr powder, 1-2% of Mn powder and 1-2% of SiFe; the size and the shape of single wollastonite particles of the long-fiber wollastonite are as follows: the length is 500-1000 mu m, and the length-diameter ratio is more than or equal to 10: 1.
2. The long-fiber wollastonite framed low-density surfacing flux according to claim 1, wherein the long-fiber wollastonite comprises the following chemical components in percentage by mass: 42-52% CaO, 45-50% SiO2MgO is less than or equal to 2 percent, S is less than or equal to 0.03 percent and P is less than or equal to 0.03 percent.
3. The long fiber wollastonite-framed low-density overlay welding flux according to claim 1, wherein the long fiber wollastonite is prepared by: selecting wollastonite raw ore with qualified chemical components, mechanically crushing the wollastonite raw ore into particles of 2-5 mm, processing the wollastonite raw ore by using an air flow mill, and screening long fiber wollastonite meeting the size requirement by using a rectangular hole type screen.
4. The long fiber wollastonite framed low density hardfacing flux of claim 1, wherein the alumina is satisfied with a chemical composition comprising, in mass percent: al (Al)2O3More than or equal to 99 percent, less than or equal to 0.03 percent of S and less than or equal to 0.03 percent of P; the fluorite comprises the following chemical components in percentage by mass: CaF2More than or equal to 96 percent, S less than or equal to 0.03 percent and P less than or equal to 0.03 percent; the potassium feldspar comprises the following chemical components in percentage by mass: k2O≥10%，Al2O3Not less than 18% and SiO2≥60%。
5. The low-density surfacing flux with long-fiber wollastonite as a frame according to claim 4, wherein the screening sizes of the alumina, fluorite and potassium feldspar are all 60 meshes.
6. The long fiber wollastonite framed low-density surfacing flux according to claim 1, wherein the Cr powder satisfies the chemical composition comprising, in mass percent: cr is more than or equal to 98 percent, S is less than or equal to 0.03 percent and P is less than or equal to 0.01 percent; the Mn powder comprises the following chemical components in percentage by mass: mn is more than or equal to 98 percent, S is less than or equal to 0.03 percent and P is less than or equal to 0.01 percent; the SiFe satisfies the following chemical components in percentage by mass: 42-47% of Si, less than or equal to 0.03% of S and less than or equal to 0.04% of P.
7. The long fiber wollastonite framed low density surfacing flux according to claim 6, wherein the screened sizes of the Cr powder, Mn powder and SiFe are all 80 mesh.
8. A preparation method of the long fiber wollastonite frame based low-density surfacing flux according to any one of 1 to 7 is characterized by comprising the following steps:
s1: uniformly mixing the raw materials according to a proportion, adding pure potassium water glass, and uniformly stirring, wherein the adding weight of the pure potassium water glass is 20-25% of the total weight of the raw materials, so as to obtain a mixed raw material;
s2: and (3) rolling and granulating the prepared mixed raw materials by a rotating swash plate, and then sequentially drying at a low temperature of 120-160 ℃, sieving, crushing and drying at a high temperature of 650-720 ℃ to obtain the finished product of the welding flux.
9. The method for preparing the long fiber wollastonite framed low-density surfacing flux according to claim 8, wherein the finished flux particles prepared in the step S2 have a mesh size of 8-40.
Priority Applications (1)
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| CN111283347A (en) * | 2020-03-09 | 2020-06-16 | 江苏省特种设备安全监督检验研究院 | Cold-hot double-wire nickel-based alloy submerged arc surfacing sintered flux and preparation method thereof |
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| US4086389A (en) * | 1975-04-23 | 1978-04-25 | Nippon Steel Corporation | Coating composition comprising crystalline cellulose and a coated electrode for arc welding produced therewith |
| JP3765772B2 (en) * | 2002-04-30 | 2006-04-12 | 株式会社神戸製鋼所 | Stainless steel flux cored wire |
| CN108817730B (en) * | 2018-07-31 | 2020-10-27 | 佳木斯大学 | Ultra-low-carbon high-boron-based high-temperature wear-resistant surfacing alloy material and preparation method and application thereof |
| CN112475669B (en) * | 2020-11-20 | 2022-04-19 | 济南市金材焊接材料有限公司 | Silicon-calcium type sintered flux and preparation method thereof |
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| GB1030326A (en) * | 1963-09-17 | 1966-05-18 | Murex Welding Processes Ltd | Improvements in arc welding electrodes |
| CN103469672A (en) * | 2013-09-07 | 2013-12-25 | 郴州四方立投资有限公司 | Preparation method of wollastonite long fiber for papermaking industry |
| CN105252172A (en) * | 2015-09-28 | 2016-01-20 | 洛阳双瑞特种合金材料有限公司 | Preparation method for sintered flux used for nickel base strip electrode submerged arc surfacing |
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| CN108637527A (en) * | 2018-07-27 | 2018-10-12 | 四川西冶新材料股份有限公司 | A kind of Lincoln weld sintered flux and preparation method for 1000MPa high-strength steel |
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