CN114346521B - Metal type flux-cored wire and preparation method of stainless steel bearing ring - Google Patents
Metal type flux-cored wire and preparation method of 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 flux-cored wire comprises the following components: chromium powder, nickel powder, molybdenum powder, vanadium iron powder, niobium iron 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 welding seam chemical components can be provided, the deposition speed of the flux-cored wire is high, and the production efficiency is high; can improve the toughness, 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 better process performance and meets the requirements of practical engineering problems. The preparation method of the stainless steel bearing ring uses CMT welding as a heat source, the metal type flux-cored wire as a raw material, and the additive is used for manufacturing the stainless steel bearing ring, 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 also 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 rotator, can ensure the rotation precision of the rotator while reducing the friction and abrasion of the rotator in the motion process, and is known as a mechanical joint. The quality of the parts directly affects the reliability and the service performance of the product. In the mechanical industry, the bearing is taken as an important basic component product, and plays a very important role in various fields of national economy construction in China. With the progress of society and the development of scientific technology, the requirements of various industries on bearing varieties, quantity and quality are higher and higher, so that new products are required to be developed greatly, the production process is improved continuously, and the production capacity is improved continuously so as to meet the requirements of rapid development of national economy.
Compared with the common bearing, the stainless steel bearing has stable work, low noise, stronger rust resistance and corrosion resistance in the working process, proper lubricant, dust cover and the like, and can be used in the environment of minus 60 ℃ to plus 300 ℃. The bearing ring is one of three parts of a stainless steel bearing, is mainly of an annular structure, and the machining quality of the bearing ring has direct influence on the precision, performance and service life of a finished bearing product. At present, most of bearing rings are manufactured by casting, forging and turning. But the occurrence rate of defects of shrinkage porosity and shrinkage cavity in casting is high; the manufacturing cost of the forging die is high, and 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 the toughness of the bearing ring are affected; 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 high-carbon chromium, the bearing prepared from the steel cannot meet the requirements of noise and precision, and 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 is greatly damaged, and the fatigue life is relieved.
Disclosure of Invention
The invention aims to provide a metal flux-cored wire, which solves the problem that the stainless bearing steel in the prior art is easy to generate fatigue crack sources.
The technical scheme adopted by the invention is that the metal type 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 contents of the components is 100%.
The invention is also characterized in that:
the welding skin of the welding wire is a stainless steel band.
Another object of the invention is to provide a method of manufacturing a stainless steel bearing ring.
The preparation method of the stainless steel bearing ring comprises the following steps:
step 1, respectively weighing the raw materials according to the mass percentage: 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 contents of the components is 100%;
step 2, heating and preserving heat of the raw materials weighed in the step 1 in an inert gas atmosphere to obtain flux-cored powder;
step 3, filling the flux-cored powder into a U-shaped groove of a stainless steel strip, manufacturing a welding wire after closing a forming roller, and reducing the welding wire step by step to obtain a metal flux-cored wire;
and 4, loading the metal type flux-cored wire into a full-automatic welding robot, determining the layer height according to a planned welding path, performing additive manufacturing by adopting a spiral rising mode to form a pipe fitting by adopting an arc additive manufacturing technology taking CMT as a heat source, and performing offset filling from inside to outside layer by layer to obtain 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 process parameters of the CMT in the step 4 are as follows: the welding speed is 0.41 m/min-0.43 m/min, the lifting speed of each layer of welding gun is 0.7 mm-1 mm, and the protective gas is 80 percent Ar+20 percent CO 2 。
The beneficial effects of the invention are as follows:
the metal type flux-cored wire has good technological performance, even 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 toughness, 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 better process performance and meets the requirements of practical engineering problems. The preparation method of the stainless steel bearing ring uses CMT welding as a heat source, the metal type flux-cored wire as a raw material, and the additive is used for manufacturing the stainless steel bearing ring, so that the efficiency is high, the required equipment is less, and the production cost is low; the splashing is less, the electric arc is stable in the additive manufacturing process, the whole forming process is good, and the formed shape is complete and has no defect; related materials and equipment investment are saved, the die cost investment is reduced, the machining allowance is small, and resources can be saved greatly; the production process is simple, the operation is easy, and the organization mechanical and automatic production is convenient; 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 flux core of 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 contents of the components is 100%. The welding skin of the welding wire is a stainless steel band.
The components of the metal type welding wire of the invention have the following functions:
cr is contained in the martensitic stainless steel at most 18% and at least 11.5%. If the Cr content is too high, a part of ferrite remains in the martensitic matrix after solution treatment, so that the solute in the steel is not fully dissolved, the structure is not a single supersaturated solid solution, and the effect of aging strengthening cannot be fully exerted in the subsequent aging treatment, which damages the thermoplasticity of the steel and reduces the toughness and corrosion resistance of the steel.
Ni is an important element in martensitic stainless steel, itCan form stable austenite in the structure of steel and enlarge the austenite area, and improve the properties of plasticity, workability, toughness and the like of the matrix by a soft phase. The crystal structure of plain carbon steel is in a body centered cubic (bcc) structure, and the addition of Ni element plays a role of changing the crystal structure so that it is transformed into a face centered cubic (fcc) structure, i.e., austenite. However, if Ni content is too high, gamma-phase region expands and M s The point is reduced, residual austenite exists during cooling, the performance of the matrix is affected, and the strength is greatly reduced.
The main purpose of Si and Mn addition is deoxidation, and both have good deoxidation effect. Wherein Mn also has a desulfurization effect, sulfur is a harmful element in steel, and on one hand, it reduces the corrosion resistance of the steel; on the other hand it can lead to thermal cracking. When the manganese content is excessive, plasticity and toughness of the weld overlay are reduced, and grain growth is also caused, so that high-temperature hardness is reduced.
When a certain amount of Mo element is added into the flux-cored wire, mo is formed in deposited metal 2 And C, simultaneously, the structure of the primary carbide is changed, and the content of the primary carbide is increased. The formed carbide can be used as particles with non-uniform nucleation, promote the non-uniform nucleation and inhibit the growth of crystal grains, thereby refining the crystal grains, improving the hardness of deposited metal and improving the uniformity of the hardness distribution of the deposited metal. When the Mo content is too high, excessive Mo is accumulated in grain gaps, which can cause microcrack generation and influence the usability of deposited metal, so that the adding amount of ferromolybdenum is in a reasonable range. The existence of Nb element can form NbC and prevent CrC from forming, thereby preventing intergranular corrosion candles and achieving strengthening effect.
V is a ferrite forming element, can form a stable compound with C, O, N, mainly exists as carbide, increases tempering stability and produces a secondary hardening effect, refines a structure, increases the coarsening temperature of crystal grains and reduces overheat sensitivity; due to V formation in martensitic stainless steels 4 C 3 VN, the polymerization growth rate is slow at high temperature, so that the thermal force and high temperature creep resistance can be enhanced, and the content is generally 0.15% -0.40%: prevent intergranular candles, refine grains and improve tempering stabilityCan be secondarily hardened. The Al element forms a fine dispersed NiAl precipitation phase during tempering to generate a precipitation strengthening effect, and forms an AlN phase to refine austenite grains to generate fine grain strengthening and toughening. W is ferrite and carbide forming element, and similar to Mo, the tempering stability, red hardness and thermal force are enhanced, the creep resistance at high temperature is stable, and the oxidation resistance is not beneficial (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 a part of carbon with nitrogen, so that nitrogen is added in the steel to form more nitrides, prevent the growth of grains and play a role in refining the grains in the steel. Through nitrogen alloying modification, a large quantity of nitride and carbonitride which are dispersed and distributed are obtained, and part of nitrogen is alloyed, so that the surface of the mechanical part can be strengthened, and the service life of the mechanical part can be effectively prolonged. Thus, nitrogen may be made to play a beneficial role in the steel by proper alloying of the nitrogen.
The HF element is added into the alloy, so that the alloy has the function of refining the structure and can improve the heat resistance and the wear resistance of the alloy. Ta and rare earth elements can play roles in purifying molten steel, modifying impurities, strengthening and microalloying in stainless steel. Besides, besides the alloy powder of the elements added 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, respectively weighing the raw materials according to the mass percentage: 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 contents of the components is 100%;
step 2, uniformly mixing the raw materials weighed in the step 1, placing the mixture into a tube furnace, continuously introducing argon, and preserving heat for 2-3 hours at 200-300 ℃ to obtain flux-cored powder;
step 3, placing a stainless steel strip (the components are 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 20-23wt%, rolling and closing the U-shaped groove by the forming machine, wiping clean by acetone or absolute ethyl alcohol, drawing until the diameter is 1.2mm, wiping greasy dirt on a welding wire by cotton cloth dipped with the acetone or the absolute ethyl alcohol, and finally straightening, coiling the welding wire into a disc and sealing and packaging by a wire drawing machine to finish the preparation of the metal type flux-cored wire;
step 4, loading the prepared metal type flux-cored wire into a full-automatic welding robot, planning a welding path, determining layer height, writing a program, inputting the program into the welding machine, running a welding machine command, and adopting an arc additive manufacturing technology with CMT as a heat source to perform additive layer by layer to obtain a stainless steel bearing ring, wherein the technological parameters of the CMT additive are as follows: the welding speed is 0.41 m/min-0.43 m/min; lifting each layer of welding gun by 0.7-0.9 mm; the protective gas is 80 percent Ar+20 percent CO 2 。
Through the mode, the metal type flux-cored wire disclosed by the invention has the advantages that the process performance is good, the molten drop transition is uniform, the components and the proportion of the welding flux can be adjusted, the required welding seam chemical components can be provided, the deposition speed of the flux-cored wire is high, and the production efficiency is high. The metal type flux-cored wire can improve the toughness, 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 better process performance and meets the requirements of practical engineering problems. The preparation method of the stainless steel bearing ring uses CMT welding as a heat source, the metal type flux-cored wire as a raw material, and the additive is used for manufacturing the stainless steel bearing ring, so that the efficiency is high, the required equipment is less, and the production cost is low; the splashing is less, the electric arc is stable in the additive manufacturing process, the whole forming process is good, and the formed shape is complete and has no defect; related materials and equipment investment are saved, the die cost investment is reduced, the machining allowance is small, and resources can be saved greatly; the production process is simple, the operation is easy, and the organization mechanical and automatic production is convenient; 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 raw materials in a tube furnace, and keeping the temperature at 200 ℃ for 2 hours under the condition of continuously introducing argon to obtain flux-cored powder;
step 3, placing a stainless steel strip (the components are 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 22.4wt%, rolling the U-shaped groove by the forming machine, wiping clean with acetone or absolute ethyl alcohol, drawing until the diameter is 1.2mm, wiping oil stain on a welding wire with cotton cloth dipped with the acetone or the absolute ethyl alcohol, and finally straightening the welding wire through a wire drawing machine, coiling into a disc, sealing and packaging to finish the preparation of the metal flux-cored wire;
step 4, loading the prepared metal type flux-cored wire into a full-automatic welding robot, planning a welding path, determining layer height, writing a program, inputting the program into the welding machine, running a welding machine command, and adopting an arc additive manufacturing technology with CMT as a heat source to perform additive layer by layer to obtain a stainless steel bearing ring, wherein the technological parameters of the CMT additive are as follows: the welding speed is 0.41m/min; lifting each layer of welding gun by 0.9mm; the protective gas is 80 percent Ar+20 percent CO 2 。
The stainless steel bearing ring prepared by the embodiment has uniform overall appearance after molding, no obvious defect and high molding quality of the thin-wall profile.
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 raw materials in a tube furnace, and keeping the temperature at 230 ℃ for 3 hours under the condition of continuously introducing argon to obtain flux-cored powder;
and 3, placing a stainless steel strip (the components are 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 21.7wt%, rolling the U-shaped groove by the forming machine, wiping clean with acetone or absolute ethyl alcohol, drawing until the diameter is 1.2mm, wiping oil stain on a welding wire by using cotton cloth dipped with the acetone or the absolute ethyl alcohol, and finally straightening the welding wire by using a wire drawing machine, coiling into a disc, sealing and packaging to finish the preparation of the metal flux-cored wire.
Step 4, loading the prepared metal type flux-cored wire into a full-automatic welding robot, planning a welding path, determining layer height, writing a program, inputting the program into the welding machine, running a welding machine command, and adopting an arc additive manufacturing technology with CMT as a heat source to perform additive layer by layer to obtain a stainless steel bearing ring, wherein the technological parameters of the CMT additive are as follows: the welding speed is 0.43m/min; lifting each layer of welding gun by 0.7mm; the protective gas is 80 percent Ar+20 percent CO 2 。
The stainless steel bearing ring prepared by the embodiment has uniform overall appearance after molding, no obvious defect and high molding quality of the thin-wall profile.
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 raw materials in a tube furnace, and keeping the temperature at 250 ℃ for 2.5 hours under the condition of continuously introducing argon to obtain flux-cored powder;
and 3, placing a stainless steel strip (the components are 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 the flux-cored powder into the U-shaped groove, controlling the filling rate of the flux-cored powder to be 22.8wt%, rolling and closing the U-shaped groove by the forming machine, wiping the U-shaped groove with acetone or absolute ethyl alcohol, drawing until the diameter is 1.2mm, wiping oil stain on the welding wire with cotton cloth dipped with the acetone or the absolute ethyl alcohol, and finally straightening the welding wire through a wire drawing machine, coiling the welding wire into a disc, sealing and packaging to complete the preparation of the metal flux-cored wire.
Step 4, loading the prepared metal type flux-cored wire into a full-automatic welding robot, planning a welding path, determining layer height, writing a program, inputting the program into the welding machine, running a welding machine command, and adopting an arc additive manufacturing technology with CMT as a heat source to perform additive layer by layer to obtain a stainless steel bearing ring, wherein the technological parameters of the CMT additive are as follows: the welding speed is 0.42m/min; lifting each layer of welding gun by 0.8mm; the protective gas is 80 percent Ar+20 percent CO 2 。
The stainless steel bearing ring prepared by the invention has uniform overall appearance after molding, no obvious defect and high molding quality of thin-wall profile.
Table 1 chemical composition (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 | Allowance of |
Compared with a solid welding wire, the flux-cored wire prepared by the invention has the following advantages: because of high current density, the welding wire has high melting speed and higher deposition speed; the slag former is not present, the slag amount on the surface of the welding seam is small, and the multi-layer overlaying (3-4 layers) can be continuously carried out without slag removal, so that the cleaning time and the cleaning cost are reduced, and the labor intensity is reduced; forming a welding line well; the pollutants and wastes during welding are reduced, and welding smoke dust is reduced. And various alloy elements can be flexibly and conveniently added into the powder as required to adjust the metal powder core flux-cored wire to different welding wire varieties, so that the metal powder core flux-cored wire has obvious metallurgical improvement effect and good crack resistance. And the solid welding wire needs to be smelted again when the alloy components are regulated once; in addition, in the drawing process of the solid welding wire, some steel ingots have poor drawing property, and the solid welding wire is not easy to draw into a required welding wire.
In addition, the invention adopts CMT as a heat source for preparing the stainless steel bearing ring by additive, and compared with the common arc additive technology, the CMT additive has obvious advantages: the molten drop transition is realized by responding to a short circuit signal by a machine, and the fracture circuit and the back-drawing wire material realize the transition of the molten drop, the transition is stable, and the spatter of welding slag is small; the droplet transition of CMT is a cold transition, the separation of the wire and the droplet is realized by means of the back drawing of the wire, the time point, the speed, the amplitude and the like of the back drawing of the wire can be monitored by a digital control system, the droplet at the end part of the wire can be ensured to stably fall into a molten pool, and the arc striking is prepared for the arc striking, so that the welding efficiency is high; CMT is an intermittent heat input technique, the additive process is alternating cold and hot, and the total heat input is reduced.
Claims (4)
1. The metal type 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 contents of the components is 100%.
2. The metal-type flux-cored wire of claim 1, wherein the weld 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 of:
step 1, respectively weighing the raw materials according to the mass percentage: 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 contents of the components is 100%;
step 2, heating and preserving heat of the raw materials weighed in the step 1 in an inert gas atmosphere to obtain flux-cored 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;
step 4, loading the metal type 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 arc additive manufacturing technology with CMT as a heat source in a mode of spiral rising to form a pipe fitting, and performing offset filling from inside to outside layer by layer to obtain a stainless steel bearing ring;
the process parameters of the CMT in the step 4 are as follows: the welding speed is 0.41 m/min-0.43 m/min, the lifting speed of each layer of welding gun is 0.7 mm-1 mm, and the protective gas is 80 percent Ar+20 percent CO 2 。
4. The method for manufacturing 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 heat preservation time is 2-3 hours.
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