CN114346521A - Preparation method of metal type flux-cored wire and stainless steel bearing ring - Google Patents
Preparation method of metal type flux-cored wire and stainless steel bearing ring Download PDFInfo
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Abstract
The invention discloses a preparation method of a metal type flux-cored wire and a stainless steel bearing ring, wherein the flux core of the wire comprises the following components: chromium powder, nickel powder, molybdenum powder, ferrovanadium powder, ferroniobium powder, aluminum powder, tungsten powder, chromium nitride, hafnium boride, tantalum powder, lanthanum oxide, sodium fluoride and the balance of iron powder. The molten drop transition is uniform, the components and the proportion of the welding flux can be adjusted, the required chemical components of the welding seam can be provided, the deposition speed of the flux-cored wire is high, and the production efficiency is high; can improve the obdurability, the wear resistance, the corrosion resistance and the high-temperature stability of the high-carbon chromium type stainless bearing steel, so that the high-carbon chromium type stainless bearing steel has more excellent processing performance and meets the requirements of practical engineering problems. The preparation method of the stainless steel bearing ring takes the CMT welding as a heat source and the metal flux-cored wire as a raw material, and the stainless steel bearing ring is manufactured by using additive materials, so that the efficiency is high, the required equipment is less, and the production cost is low.
Description
Technical Field
The invention belongs to the technical field of metal materials, relates to a metal type flux-cored wire, and further relates to a method for preparing a stainless steel bearing ring by adopting the metal type flux-cored wire.
Background
The bearing is an important part for supporting the mechanical rotating body, reduces friction and abrasion of the rotating body in the moving process, can ensure the rotating precision of the rotating body, and is known as a mechanical joint. The quality of the parts directly influences the reliability and the service performance of the product. In the mechanical industry, the bearing as an important basic part product occupies a very important position and role in various fields of national economic construction in China. With the progress of society and the development of science and technology, the requirements of various industries on the variety, the quantity and the quality of bearings are higher and higher, so that new products need to be developed vigorously, the production process needs to be improved continuously, and the production capacity needs to be improved in an effort to meet the requirement of rapid development of national economy.
Compared with the common bearing, the stainless steel bearing has stable work, low noise and stronger rust prevention and corrosion prevention in the working process, and can be used in the environment of minus 60 ℃ to plus 300 ℃ by selecting proper lubricants, dust covers and the like. The bearing ring is one of three parts of a stainless steel bearing, is mainly of an annular structure, and has direct influence on the precision, the performance and the service life of a finished bearing product due to the processing quality. At present, most of the bearing rings are prepared by casting, forging and lathing. But the defect incidence of shrinkage porosity and shrinkage cavity in casting is large; the manufacturing cost of the forging die is very high, the forging die is only suitable for mass production, and in addition, the bearing ring is easy to generate overburning, internal cracking, decarburization and the like during forging, so that the strength and toughness of the bearing ring are influenced; the bearing ring is directly machined by stainless steel bar stock, and the material consumption rate is high. In addition, the existing stainless bearing steel is of a high-carbon chromium type, the bearing manufactured by the steel cannot meet the requirements of noise and precision, and meanwhile, when the bearing bears a large load, stress concentration is easily caused at the position of eutectic carbide to generate a fatigue crack source, so that the service performance of the bearing and the fatigue life are relieved to a great extent.
Disclosure of Invention
The invention aims to provide a metal type flux-cored wire, which solves the problem that the stainless bearing steel in the prior art is easy to generate a fatigue crack source.
The technical scheme adopted by the invention is that the metal flux-cored wire comprises the following components in percentage by mass:
11-13% of chromium powder, 4.5-5.5% of nickel powder, 1.2-1.4% of molybdenum powder, 1.8-2.1% of ferrovanadium powder, 1.8-2.2% of ferroniobium powder, 1.1-1.3% of aluminum powder, 2.4-2.6% of tungsten powder, 3.6-4.5% of chromium nitride, 0.08-0.12% of hafnium boride, 0.05-0.065% of tantalum powder, 0.48-0.52% of lanthanum oxide, 0.9-1.1% of sodium fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%.
The invention is also characterized in that:
the welding skin of the welding wire is a stainless steel band.
The invention also aims to provide a preparation method of the stainless steel bearing ring.
The invention adopts another technical scheme that the preparation method of the stainless steel bearing ring comprises the following steps:
step 1, weighing the following raw materials in percentage by mass: 11-13% of chromium powder, 4.5-5.5% of nickel powder, 1.2-1.4% of molybdenum powder, 1.8-2.1% of ferrovanadium powder, 1.8-2.2% of ferroniobium powder, 1.1-1.3% of aluminum powder, 2.4-2.6% of tungsten powder, 3.6-4.5% of chromium nitride, 0.08-0.12% of hafnium boride, 0.05-0.065% of tantalum powder, 0.48-0.52% of lanthanum oxide, 0.9-1.1% of sodium fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%;
step 2, heating the raw materials weighed in the step 1 in an inert gas atmosphere and preserving heat to obtain medicine core powder;
step 3, filling the flux-cored powder into a stainless steel strip U-shaped groove, manufacturing a welding wire after closing a forming roller, and reducing the diameter of the welding wire step by step to obtain a metal flux-cored wire;
and 4, loading the metal flux-cored wire into a full-automatic welding robot, determining the layer height according to a planned welding path, performing additive manufacturing by adopting an electric arc additive manufacturing technology with CMT as a heat source and adopting a mode of forming a pipe fitting by spiral lifting, performing offset filling from inside to outside in a way of increasing materials layer by layer, and thus obtaining the stainless steel bearing ring.
In the step 2, the inert gas is argon, the heating temperature is 200-300 ℃, and the heat preservation time is 2-3 h.
The CMT process parameters in the step 4 are as follows: the welding speed is 0.41m/min to 0.43m/min, each layer of welding gun is lifted by 0.7mm to 1mm, and the protective gas is 80 percent of Ar and 20 percent of CO2。
The invention has the beneficial effects that:
the metal flux-cored wire has good processing performance and uniform molten drop transition, can adjust the components and proportion of the welding flux, can provide the required chemical components of the welding seam, and has high deposition speed and high production efficiency; can improve the obdurability, the wear resistance, the corrosion resistance and the high-temperature stability of the high-carbon chromium type stainless bearing steel, so that the high-carbon chromium type stainless bearing steel has more excellent processing performance and meets the requirements of practical engineering problems. According to the preparation method of the stainless steel bearing ring, the CMT welding is used as a heat source, the metal flux-cored wire is used as a raw material, and the stainless steel bearing ring is manufactured by using additive materials, so that the efficiency is high, the required equipment is few, and the production cost is low; less splashing and stable electric arc in the additive manufacturing process, good whole forming process and complete and undamaged appearance after forming; the investment of related materials and equipment is saved, the investment of die cost is reduced, the machining allowance is small, and resources can be greatly saved; the production process is simple, the operation is easy, and the tissue mechanization and automatic production are facilitated; the material utilization rate is improved, the production cost is reduced, and the production period is shortened.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The metal flux-cored wire comprises the following components in percentage by mass:
11-13% of chromium powder, 4.5-5.5% of nickel powder, 1.2-1.4% of molybdenum powder, 1.8-2.1% of ferrovanadium powder, 1.8-2.2% of ferroniobium powder, 1.1-1.3% of aluminum powder, 2.4-2.6% of tungsten powder, 3.6-4.5% of chromium nitride, 0.08-0.12% of hafnium boride, 0.05-0.065% of tantalum powder, 0.48-0.52% of lanthanum oxide, 0.8-1% of sodium fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%. The welding skin of the welding wire is a stainless steel band.
The metal type welding wire comprises the following components:
the content of Cr in the martensitic stainless steel is not more than 18 percent at most and not less than 11.5 percent at least. If the Cr content is too high, a part of ferrite remains in the martensitic matrix after the solution treatment, so that the solute in the steel in solution cannot be sufficiently dissolved, the structure is not a single supersaturated solid solution, and the effect of aging strengthening cannot be sufficiently exerted in the subsequent aging treatment, which may destroy the thermoplasticity of the steel, and reduce the toughness and corrosion resistance of the steel.
Ni is an important element in martensitic stainless steel, and forms stable austenite in the steel structure and expands the austenite region, so that the soft phase improves the properties of the matrix, such as plasticity, workability and toughness. The crystal structure of the plain carbon steel is a body-centered cubic (bcc) structure, and the addition of the Ni element serves to change the crystal structure, thereby transforming it into a face-centered cubic (fcc) structure, i.e., austenite. However, if the Ni content is too high, the gamma phase region is enlarged and M issThe point is reduced, and residual austenite exists during cooling, so that the performance of the matrix is influenced, and the strength is greatly reduced.
The main purpose of the addition of Si and Mn is to deoxidize, and both have a good deoxidizing effect. Mn also has a desulfurizing effect, sulfur is a harmful element in steel, and on the one hand, the Mn can reduce the corrosion resistance of the steel; on the other hand it can lead to the formation of thermal cracks. When the manganese content is excessive, the weld overlay ductility and toughness are reduced, and it also causes grain growth, reducing high temperature hardness.
When a certain amount of Mo element is added into the flux-cored wire, Mo is formed in deposited metal2C, simultaneously changing the structure of the primary carbide and increasing the content of the primary carbide. The formed carbide can be used as a mass point of non-uniform nucleation, promote the non-uniform nucleation, inhibit the growth of crystal grains, refine the crystal grains, improve the hardness of deposited metal and improve the uniformity of the hardness distribution of the deposited metal. When the Mo content is too high, excessive Mo accumulates in the grain gaps, which may cause the generation of microcracks, affecting the deposited metalThe use performance, so the addition amount of ferromolybdenum is within a reasonable range. The Nb element can form NbC and prevent CrC from being formed, thereby preventing intergranular corrosion and achieving the strengthening effect.
V is a ferrite forming element, can form a stable compound with C, O, N, mainly exists in the form of carbide, increases the tempering stability, generates a secondary hardening effect, refines the structure, improves the coarsening temperature of crystal grains, and reduces the overheating sensitivity; in martensitic stainless steels due to V formation4C3VN, the polymerization growth rate is slow under high temperature, so can strengthen the hot strength and the high temperature creep resistance, the content is generally 0.15% -0.40%: prevent intergranular corrosion, refine grains, improve tempering stability and realize secondary hardening. The Al element forms a fine and dispersed NiAl precipitation phase during tempering to generate a precipitation strengthening effect, and forms an AlN phase to refine austenite grains to generate fine grains and strengthen and toughen. W is ferrite and carbide forming element, similar to Mo, enhances the tempering stability, red hardness and heat strength, resists stable high-temperature creep property, and resists oxidation and is useless (harmful oxidation resistance is added at high temperature); solid solution strengthening, improving heat resistance, and improving tempering stability (secondary hardening).
CrN is added to replace part of carbon with nitrogen, and nitrogen added in steel can form more nitrides to prevent the growth of crystal grains and play a role in refining the crystal grains in the steel. Through nitrogen alloying modification, enough number of dispersedly distributed nitrides and carbonitrides are obtained, and partial nitrogen is alloyed, so that the surface of a mechanical part can be strengthened, and the service life of the mechanical part can be effectively prolonged. Thus, nitrogen can be made to play a beneficial role in steel by appropriate nitrogen alloying.
The addition of HF element in the alloy has the effect of refining the structure and can improve the heat resistance and wear resistance of the alloy. Ta and rare earth elements can play a role in purifying molten steel, modifying inclusions, strengthening and microalloying in stainless steel. In addition, besides the addition of alloy powder of elements into the welding wire, NaF with the mass fraction of 1% is added into the formula as an arc stabilizer for reducing the splashing rate of the metal type flux-cored wire in the stacking process.
The preparation method of the stainless steel bearing ring comprises the following steps:
step 1, weighing the following raw materials in percentage by mass: 11-13% of chromium powder, 4.5-5.5% of nickel powder, 1.2-1.4% of molybdenum powder, 1.8-2.1% of ferrovanadium powder, 1.8-2.2% of ferroniobium powder, 1.1-1.3% of aluminum powder, 2.4-2.6% of tungsten powder, 3.6-4.5% of chromium nitride, 0.08-0.12% of hafnium boride, 0.05-0.065% of tantalum powder, 0.48-0.52% of lanthanum oxide, 0.8-1% of sodium fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%;
step 2, uniformly mixing the raw materials weighed in the step 1, placing the mixture in a tube furnace, continuously introducing argon, and keeping the temperature at 200-300 ℃ for 2-3 h to obtain medicine core powder;
step 3, placing a stainless steel strip (with the components shown in table 1) with the width of 7mm and the thickness of 0.3mm on a strip placing machine of a welding wire forming machine, rolling the stainless steel strip into a U-shaped groove through a pressing groove of the forming machine, filling flux-cored powder into the U-shaped groove of the stainless steel strip, controlling the filling rate of the flux-cored powder to be 20-23 wt%, then rolling and closing the U-shaped groove by the forming machine, wiping the groove with acetone or absolute ethyl alcohol, drawing the groove till the diameter is 1.2mm, wiping oil stains on the welding wire with cotton cloth dipped with acetone or absolute ethyl alcohol, straightening the welding wire by a wire drawing machine, coiling the welding wire into a disc, and sealing and packaging the disc to finish the preparation of the metal flux-cored welding wire;
step 4, the prepared metal flux-cored wire is loaded into a full-automatic welding robot, a welding path is planned, the layer height is determined, a program is compiled and input into the welding robot, a welding machine command is operated, and a stainless steel bearing ring is obtained by adopting an electric arc additive manufacturing technology with CMT as a heat source and increasing materials layer by layer, wherein the CMT additive technological parameters are as follows: the welding speed is 0.41m/min to 0.43 m/min; lifting each layer of welding gun by 0.7-0.9 mm; the protective gas is 80% Ar + 20% CO2。
Through the mode, the metal flux-cored wire has the advantages of good processing performance, uniform molten drop transition, capability of adjusting the components and proportion of the welding flux, capability of providing required chemical components of a welding seam, high deposition speed and high production efficiency. The metal type flux-cored wire can improve the obdurability, the wear resistance, the corrosion resistance and the high-temperature stability of the high-carbon chromium type stainless bearing steel, so that the metal type flux-cored wire has more excellent technological properties and meets the requirements of practical engineering problems. According to the preparation method of the stainless steel bearing ring, the CMT welding is used as a heat source, the metal flux-cored wire is used as a raw material, and the stainless steel bearing ring is manufactured by using additive materials, so that the efficiency is high, the required equipment is few, and the production cost is low; less splashing and stable electric arc in the additive manufacturing process, good whole forming process and complete and undamaged appearance after forming; the investment of related materials and equipment is saved, the investment of die cost is reduced, the machining allowance is small, and resources can be greatly saved; the production process is simple, the operation is easy, and the tissue mechanization and automatic production are facilitated; the material utilization rate is improved, the production cost is reduced, and the production period is shortened.
Example 1
Step 1, respectively weighing 12% of chromium powder, 5% of nickel powder, 1.3% of molybdenum powder, 2.0% of ferrovanadium powder, 2% of ferroniobium powder, 1.2% of aluminum powder, 2.4% of tungsten powder, 4% of chromium nitride, 0.1% of hafnium boride, 0.05% of tantalum powder, 0.5% of lanthanum oxide, 1% of sodium fluoride and the balance of iron powder according to mass percentage, wherein the sum of the mass percentages of the components is 100%;
step 2, uniformly mixing all the raw materials weighed in the step 1, placing the mixture in a tube furnace, and keeping the temperature for 2 hours at 200 ℃ under the condition of continuously introducing argon to obtain medicine core powder;
step 3, placing a stainless steel strip (with the components shown in table 1) with the width of 7mm and the thickness of 0.3mm on a strip placing machine of a welding wire forming machine, rolling the stainless steel strip into a U-shaped groove through a pressing groove of the forming machine, placing flux-cored powder into the U-shaped groove, wherein the filling rate of the flux-cored powder is 22.4 wt%, then rolling and closing the U-shaped groove by the forming machine, wiping the groove with acetone or absolute ethyl alcohol, drawing the groove till the diameter is 1.2mm, wiping oil stains on the welding wire with cotton cloth dipped with acetone or absolute ethyl alcohol, straightening the welding wire by a wire drawing machine, coiling the welding wire into a disc, and sealing and packaging to finish the preparation of the metal flux-cored welding wire;
step 4, the prepared metal flux-cored wire is loaded into a full-automatic welding robot, a welding path is planned, the layer height is determined, and compiling is carried outInputting a program into a welding machine, operating a welding machine command, and performing layer-by-layer material increase to obtain the stainless steel bearing ring by adopting an arc material increase manufacturing technology with CMT as a heat source, wherein the CMT material increase process parameters are as follows: the welding speed is 0.41 m/min; lifting each layer of welding gun by 0.9 mm; the protective gas is 80% Ar + 20% CO2。
The stainless steel bearing ring prepared by the embodiment has uniform integral appearance after being molded, has no obvious defect and has high molding quality of thin-wall contours.
Example 2
Step 1, respectively weighing 12% of chromium powder, 5% of nickel powder, 1.3% of molybdenum powder, 1.8% of ferrovanadium powder, 2% of ferroniobium powder, 1.2% of aluminum powder, 2.6% of tungsten powder, 4% of chromium nitride, 0.1% of hafnium boride, 0.065% of tantalum powder, 0.5% of lanthanum oxide, 1% of sodium fluoride and the balance of iron powder according to mass percentage, wherein the sum of the mass percentages of the components is 100%;
step 2, uniformly mixing all the raw materials weighed in the step 1, placing the mixture in a tubular furnace, and keeping the temperature at 230 ℃ for 3 hours under the condition of continuously introducing argon to obtain medicine core powder;
and 3, placing a stainless steel strip (with the components shown in table 1) with the width of 7mm and the thickness of 0.3mm on a strip placing machine of a welding wire forming machine, rolling the stainless steel strip into a U-shaped groove through a pressing groove of the forming machine, placing flux-cored powder into the U-shaped groove, enabling the filling rate of the flux-cored powder to be 21.7 wt%, rolling and closing the U-shaped groove by the forming machine, wiping the groove with acetone or absolute ethyl alcohol, drawing until the diameter is 1.2mm, wiping oil stains on the welding wire with cotton cloth dipped with acetone or absolute ethyl alcohol, straightening the welding wire by a wire drawing machine, coiling the welding wire into a disc, sealing and packaging to finish the preparation of the metal flux-cored welding wire.
Step 4, the prepared metal flux-cored wire is loaded into a full-automatic welding robot, a welding path is planned, the layer height is determined, a program is compiled and input into the welding robot, a welding machine command is operated, and a stainless steel bearing ring is obtained by adopting an electric arc additive manufacturing technology with CMT as a heat source and increasing materials layer by layer, wherein the CMT additive technological parameters are as follows: the welding speed is 0.43 m/min; lifting each layer of welding gun by 0.7 mm; the protective gas is 80% Ar + 20% CO2。
The stainless steel bearing ring prepared by the embodiment has uniform integral appearance after being molded, has no obvious defect and has high molding quality of thin-wall contours.
Example 3
Step 1, respectively weighing 12% of chromium powder, 5% of nickel powder, 1.3% of molybdenum powder, 2.1% of ferrovanadium powder, 2% of ferroniobium powder, 1.2% of aluminum powder, 2.5% of tungsten powder, 4% of chromium nitride, 0.1% of hafnium boride, 0.055% of tantalum powder, 0.5% of lanthanum oxide, 1% of sodium fluoride and the balance of iron powder according to mass percentage, wherein the sum of the mass percentages of the components is 100%;
step 2, uniformly mixing all the raw materials weighed in the step 1, placing the mixture in a tubular furnace, and keeping the temperature of the mixture at 250 ℃ for 2.5 hours under the condition of continuously introducing argon to obtain medicine core powder;
and 3, placing a stainless steel strip (with the components shown in table 1) with the width of 7mm and the thickness of 0.3mm on a strip placing machine of a welding wire forming machine, rolling the stainless steel strip into a U-shaped groove through a pressing groove of the forming machine, placing flux-cored powder into the U-shaped groove, controlling the filling rate of the flux-cored powder to be 22.8 wt%, then rolling and closing the U-shaped groove by the forming machine, wiping the groove with acetone or absolute ethyl alcohol, drawing until the diameter is 1.2mm, wiping oil stains on the welding wire with cotton cloth dipped with acetone or absolute ethyl alcohol, straightening the welding wire by a wire drawing machine, coiling the welding wire into a disc, sealing and packaging to finish the preparation of the metal flux-cored welding wire.
Step 4, the prepared metal flux-cored wire is loaded into a full-automatic welding robot, a welding path is planned, the layer height is determined, a program is compiled and input into the welding robot, a welding machine command is operated, and a stainless steel bearing ring is obtained by adopting an electric arc additive manufacturing technology with CMT as a heat source and increasing materials layer by layer, wherein the CMT additive technological parameters are as follows: the welding speed is 0.42 m/min; lifting each layer of welding gun by 0.8 mm; the protective gas is 80% Ar + 20% CO2。
The stainless steel bearing ring prepared by the invention has uniform integral appearance after being molded, no obvious defect and high molding quality of thin-wall contours.
Table 1 chemical composition (% by mass) of stainless steel strip used in examples 1 to 3
| C | Cr | Ni | Mn | Si | S | P | Fe |
| 0.06 | 18.67 | 8.53 | 1.51 | 0.42 | 0.014 | 0.032 | Balance of |
Compared with a solid welding wire, the flux-cored welding wire prepared by the invention has the following advantages: because the current density is high, the welding wire is high in melting speed, and the deposition speed is higher; the slag former does not exist, the slag amount on the surface of the welding seam is small, multi-layer surfacing (3-4 layers) can be continuously carried out without slag removal, the cleaning time and cost are reduced, and the labor intensity is reduced; the weld joint is formed well; reduces pollutants and wastes during welding and reduces welding smoke dust. And various alloy elements can be flexibly and conveniently added into the powder of the metal powder cored flux-cored wire according to the requirements, and the metal powder cored flux-cored wire is adjusted to different welding wire varieties, has obvious metallurgical improvement effect and good crack resistance. The alloy components of the solid welding wire need to be remelted every time the solid welding wire is adjusted; in addition, in the drawing process of the solid welding wire, the drawability of some steel ingots is poor, and the solid welding wire is not easy to be drawn into the required welding wire.
In addition, the invention adopts CMT as the heat source for preparing the stainless steel bearing ring by additive manufacturing, and compared with the common electric arc additive manufacturing technology, the CMT additive manufacturing has the obvious advantages that: the molten drop transition is realized by the machine responding to the short circuit signal, the break circuit and the drawing back wire material, the transition is stable, and the welding slag splashing is small; the molten drop transition of CMT is a cold transition, the separation of the wire and the molten drop is realized by the drawing back of the wire, the time point, the speed, the amplitude and the like of the wire drawing back can be monitored by a digital control system, the molten drop at the end part of the wire can be ensured to stably fall into a molten pool, the preparation for arc striking again can be made, and the welding efficiency is high; CMT is an intermittent heat input technology, the material adding process is cold and hot alternately, and the total heat input is reduced.
Claims (5)
1. The metal flux-cored wire is characterized in that the flux core of the wire comprises the following components in percentage by mass:
11-13% of chromium powder, 4.5-5.5% of nickel powder, 1.2-1.4% of molybdenum powder, 1.8-2.1% of ferrovanadium powder, 1.8-2.2% of ferroniobium powder, 1.1-1.3% of aluminum powder, 2.4-2.6% of tungsten powder, 3.6-4.5% of chromium nitride, 0.08-0.12% of hafnium boride, 0.05-0.065% of tantalum powder, 0.48-0.52% of lanthanum oxide, 0.9-1.1% of sodium fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%.
2. The metal-type flux-cored wire of claim 1, wherein the skin of the wire is a stainless steel strip.
3. The preparation method of the stainless steel bearing ring is characterized by comprising the following steps:
step 1, weighing the following raw materials in percentage by mass: 11-13% of chromium powder, 4.5-5.5% of nickel powder, 1.2-1.4% of molybdenum powder, 1.8-2.1% of ferrovanadium powder, 1.8-2.2% of ferroniobium powder, 1.1-1.3% of aluminum powder, 2.4-2.6% of tungsten powder, 3.6-4.5% of chromium nitride, 0.08-0.12% of hafnium boride, 0.05-0.065% of tantalum powder, 0.48-0.52% of lanthanum oxide, 0.9-1.1% of sodium fluoride and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%;
step 2, heating the raw materials weighed in the step 1 in an inert gas atmosphere and preserving heat to obtain medicine core powder;
step 3, filling the flux-cored powder into a stainless steel strip U-shaped groove, manufacturing a welding wire after a closed forming roller, and reducing the diameter of the welding wire step by step to obtain a metal flux-cored wire;
and 4, loading the metal flux-cored wire into a full-automatic welding robot, determining the layer height according to a planned welding path, performing additive manufacturing by adopting an electric arc additive manufacturing technology with CMT as a heat source and adopting a mode of forming a pipe fitting by spiral lifting, performing offset filling from inside to outside in a way of increasing materials layer by layer, and thus obtaining the stainless steel bearing ring.
4. The method for preparing a stainless steel bearing ring according to claim 3, wherein the inert gas in the step 2 is argon, the heating temperature is 200-300 ℃, and the holding time is 2-3 hours.
5. The method for preparing a stainless steel bearing ring according to claim 3, wherein the CMT in step 4 has the process parameters of: the welding speed is 0.41m/min to 0.43m/min, each layer of welding gun is lifted by 0.7mm to 1mm, and the protective gas is 80 percent of Ar and 20 percent of CO2。
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