CN108971798B

CN108971798B - Special welding wire for mixed gas shielded austenitic stainless steel and preparation method thereof

Info

Publication number: CN108971798B
Application number: CN201811145520.6A
Authority: CN
Inventors: 赵佳; 蒋勇; 明廷泽; 袁均山
Original assignee: ATLANTIC CHINA WELDING CONSUMABLES Inc
Current assignee: ATLANTIC CHINA WELDING CONSUMABLES Inc
Priority date: 2018-09-29
Filing date: 2018-09-29
Publication date: 2021-01-19
Anticipated expiration: 2038-09-29
Also published as: CN108971798A

Abstract

The invention discloses a special welding wire for mixed gas shielded austenitic stainless steel and a preparation method thereof, the welding wire consists of a sheath steel belt and a flux core, and the flux core consists of the following components in percentage by weight: 0.5 to 2.0 parts of natural rutile, 1.5 to 6.0 parts of quartz sand, 0.15 to 0.5 part of ice crystal powder, 0.2 to 0.6 part of potassium titanate, 0.8 to 1.3 parts of sodium titanate, 1.0 to 1.7 parts of electrolytic manganese, 5.0 to 7.0 parts of metallic chromium, 5.0 to 9.0 parts of atomized iron powder, 2.5 to 4.0 parts of nickel powder, 0.15 to 0.3 part of stibium, 0.1 to 0.4 part of calcined alpha alumina and 0.1 to 0.3 part of aluminum iron. Compared with the prior art, the invention has pure welding line color and beautiful forming, does not need acid cleaning and post polishing, and is suitable for welding SUS304 and SUS304L steel with higher requirements on welding process performance, welding line quality and beautiful degree.

Description

Special welding wire for mixed gas shielded austenitic stainless steel and preparation method thereof

Technical Field

The invention relates to the technical field of welding materials, in particular to a special welding wire for mixed gas shielded austenitic stainless steel, a preparation method and a welding method.

Background

The welding material industry in China has a pattern of high concentration, more enterprises and more obvious bipolar differentiation. In the field of low-end welding material products, the threshold for entering is low, a large number of small and medium-sized enterprises are gathered, the production capacity is excessive, the market competition is extremely intense, and the profit level is low. In recent years, with the improvement of the quality and variety of steel products and the improvement of the quality of various equipment manufacturing industries, infrastructures and key projects, higher requirements are put forward on the performance and stability of welding materials. As a new material in the field of welding, the proportion of the flux-cored wire in the welding material in China has been increased from 0.5% in 2000 to about 10% in 2016, but the proportion of the flux-cored wire in China is still a certain gap from that of the flux-cored wire in developed countries. In the future, high-quality, high-automation and special flux-cored wires are the general development trend of the industry in China and will become the core competitiveness and advantage of enterprises.

SUS304 and SUS304L steels are the most widely used austenitic stainless steels due to their good corrosion resistance and overall mechanical properties.

CN201711233908.7 discloses a stainless steel flux-cored wire, which is characterized by consisting of a flux core and a stainless steel strip wrapping the flux core, wherein the flux core accounts for 18-28% of the total weight of the flux-cored wire, and the flux core comprises the following components in percentage by mass: 15-20% of chromium powder, 10-15% of rutile powder, 5-10% of nickel powder, 4-8% of manganese powder, 4-8% of feldspar powder, 2-4% of aluminum-magnesium alloy powder, 2-4% of molybdenum iron powder, 2-4% of composite nitride, 0.5-2% of composite fluoride, 0.5-1% of stibium trioxide, 0.1-1% of tellurium dioxide, 0.1-1% of cerium oxide and the balance of iron powder, wherein the sum of the mass percentages of the components is 100%; however, the patent needs to change the preparation process of the welding wire on one hand, and on the other hand, the welding wire can only be used for dual-phase steel welding and cannot be used for austenitic stainless steel welding.

CN201711426148.1 discloses a metal powder core type welding wire for ferritic stainless steel, which consists of a welding flux and a steel strip, wherein the welding flux is wrapped in the steel strip, and the steel strip is an extremely low C and low P, S steel strip; the welding flux accounts for 18-22% of the total weight of the welding wire. The metal powder core type stainless steel flux-cored wire has the advantages that the welding seam tissue is ferrite, the arc stabilizer and the ferrotitanium are matched according to the proportion of the ferrite and the specification of a steel strip, after the welding wire is formed, short electric arc and stable jet flow transition can be generated in a certain operation range, so that splashing is reduced, a welding bead is formed uniformly, and because the surface of the welding bead is almost free of slag, a large amount of slag removing time is saved in thick plate welding, the labor intensity of workers is reduced, the welding efficiency is improved, and the metal powder core type stainless steel flux-cored wire is particularly suitable for welding of an automobile exhaust system. Although the welding in the patent also adopts mixed gas welding, the welding wire in the patent is adapted to the welding seam with a ferrite structure, is not adapted when being used for welding with a welding seam with an austenite structure, has poor welding effect, and deposited metal components and physical and chemical properties can not meet the requirements of 304L and 304 austenitic steel.

Disclosure of Invention

The invention aims to provide a special welding wire for mixed gas shielded austenitic stainless steel and a preparation method thereof, the welding wire has excellent welding process performance, pure weld color, attractive appearance and no need of acid washing and later polishing, and is suitable for welding SUS304 and SUS304L steel with higher requirements on welding process performance, weld quality and aesthetic measure.

The technical scheme is as follows: a mixed gas shielded austenitic stainless steel special welding wire and a preparation method thereof are provided, the welding wire is composed of a sheath steel belt and a flux core, and the flux core comprises the following components by weight: 0.5 to 2.0 parts of natural rutile, 1.5 to 6.0 parts of quartz sand, 0.15 to 0.5 part of ice crystal powder, 0.2 to 0.6 part of potassium titanate, 0.8 to 1.3 parts of sodium titanate, 1.0 to 1.7 parts of electrolytic manganese, 5.0 to 7.0 parts of metallic chromium, 5.0 to 9.0 parts of atomized iron powder, 2.5 to 4.0 parts of nickel powder, 0.02 to 0.1 part of stibium, 0.1 to 0.4 part of calcined alpha alumina and 0.05 to 0.2 part of aluminum iron.

Preferably, the weight of the flux core is 22-28% of the weight of the welding wire.

Preferably, the outer skin steel strip comprises the following components: less than or equal to 0.02 percent of C, less than or equal to 2.0 percent of Mn, less than or equal to 0.50 percent of Si, 18-20.0 percent of Cr and 8.0-12.0 percent of Ni; cu is less than or equal to 0.20 percent, S is less than or equal to 0.01 percent, P is less than or equal to 0.025 percent, N is less than or equal to 0.06 percent, Mo is less than or equal to 0.30 percent, and the balance is Fe and inevitable impurities.

Preferably, the outer skin steel strip comprises the following components: 0.014% of C, 1.33% of Mn, 0.29% of Si, 18.63% of CrN, 8.40% of Ni, 0.001% of Cu, 0.0023% of S, 0.013% of P, 0.025% of N, 0.0015% of Mo, and the balance of Fe and inevitable impurities.

Preferably, the natural rutile is 0.8 weight part, the quartz sand is 4.5 weight parts, the ice crystal powder is 0.25 weight part, the potassium titanate is 0.4 weight part, the sodium titanate is 1.2 weight parts, the electrolytic manganese is 1.4 weight parts, the metallic chromium is 5.5 weight parts, the atomized iron powder is 8.06 weight parts, the nickel powder is 2.5 weight parts, the stibium trioxide is 0.04 weight part, the calcined alpha alumina is 0.1 weight part, and the aluminum iron is 0.25 weight part.

Preferably, the natural rutile is 1.0 weight part, the quartz sand is 5.6 weight parts, the ice crystal powder is 0.43 weight part, the potassium titanate is 0.2 weight part, the sodium titanate is 0.97 weight part, the electrolytic manganese is 1.7 weight parts, the metallic chromium is 5.0 weight parts, the atomized iron powder is 6.62 weight parts, the nickel powder is 3.0 weight parts, the stibium trioxide is 0.06 weight parts, the calcined alpha alumina is 0.3 weight parts, and the aluminum iron is 0.12 weight parts.

Preferably, the natural rutile is TiO-containing₂96.52%, S0.022%, P0.027% natural rutile, and quartz sand containing SiO₂ 99.4％、Al₂ O₃0.33 percent of quartz sand, 0.019 percent of S and 0.023 percent of P, wherein the cryolite is cryolite containing 53.5 percent of F, 14 percent of Al and 31 percent of Na, and the potassium titanate is cryolite containing K₂O 26.43％、TiO₂58.21%, S0.02%, P0.024% of potassium titanate, sodium titanateNa₂O 16.57％、TiO₂75.29 percent, S0.021 percent and P0.054 percent of sodium titanate, the electrolytic manganese is the electrolytic manganese containing Mn 99.7 percent, C0.035 percent, S0.017 percent and P0.017 percent, the metallic chromium is the metallic chromium containing Cr 98.9 percent, C0.012 percent, S0.016 percent and P0.008 percent, the atomized iron powder is the atomized iron powder containing Fe 98.9 percent, C0.026 percent, S0.015 percent and P0.014 percent, the nickel powder is the nickel powder containing Ni 99.7 percent, C0.008 percent, S0.007 percent and P0.007 percent, and the antimony is the nickel powder containing Sb₂O₃99.08 percent of stibium trioxide, calcining alpha alumina to contain Al₂O₃99.95% of calcined alpha alumina, and the aluminum iron is aluminum iron containing 53.94% of Al, 0.006% of S and 0.01% of P.

Preferably, the flux-cored wire is used for welding, and the chemical components of the welding deposited metal are as follows: 0.024-0.030% of C, 1.29-1.71% of Mn1, 0.48-0.69% of Si, 0.0027-0.0031% of S, 0.012-0.013% of P, 18.57-19.69% of Cr, 9.24-9.98% of Ni, 0.037-0.038% of Mo, 0.021-0.028% of N, 0.012-0.015% of Cu and the balance of Fe and inevitable impurities.

The invention also aims to provide a preparation method of the special welding wire for mixed gas shielded austenitic stainless steel.

The technical scheme is as follows: a preparation method of a special welding wire for mixed gas shielded austenitic stainless steel comprises the following steps:

uniformly mixing all components of the medicine core for later use;

secondly, preserving the temperature of the mixed flux core at 200-250 ℃ for 2-4 hours, uniformly stirring, wrapping the flux core in an ultra-low carbon stainless steel band by adopting a precision forming process, reducing the diameter to a specified welding wire diameter through pure CRD drawing, performing online annealing to eliminate work hardening, carbonizing oil stains on the surface of the welding wire, cleaning, uniformly coating a layer of lubricant on the surface of the welding wire to ensure the wire feeding performance of the welding wire, and finally winding the welding wire through a close-packed layer to form the welding wire.

The invention also aims to provide a welding method of the mixed gas shielded austenitic stainless steel.

The technical scheme is as follows: the welding method adopts the special welding wire to weld the austenitic stainless steel, and adopts argon-rich mixed gas to shield welding.

In the invention, the rutile powder mainly has the functions of stabilizing electric arc and slagging, can adjust the melting point, viscosity, surface tension and fluidity of the slag, improves weld forming and reduces splashing. The rutile powder added in the invention plays a key role in weld forming and electric arc stability. The quartz sand mainly has the functions of slagging and adjusting the pH value, viscosity, surface tension and fluidity of the slag. The ice crystal powder has the main function of removing hydrogen to improve the anti-air hole sensitivity of the welding wire and balance the ionization potential and the melting point of slag. The potassium titanate contains titanium dioxide and potassium oxide, and can adjust the arc stability and the melting point and the fluidity of slag while slagging. The sodium titanate contains titanium dioxide and sodium oxide, and the melting point and the fluidity of electric arc and molten slag can be adjusted while slagging. The electrolytic manganese is a main deoxidizer and desulfurizer in the flux core, and can improve the quenching property of the welding line and the hot working property. The main function of the metal chromium is to transition chromium element into the welding seam to improve the oxidation resistance and corrosion resistance of the welding seam. The nickel powder has the main functions of transferring nickel elements into the welding line, improving the plasticity and toughness of the welding line and keeping the antirust and heat-resistant performances at high temperature. The antimony white has a low linear expansion coefficient and is a good surfactant. The calcined alpha alumina is alumina calcined at high temperature, and the pH value of the slag, the viscosity of the slag and the fluidity of the slag can be adjusted. Aluminum in the aluminum iron is an active alloy, and reacts with oxygen in the early reaction stage of the flux-cored wire to realize the effect of early deoxidation and oxidation reduction.

The invention principle and the beneficial effects are as follows:

the 304L-shaped stainless steel flux-cored wire has the characteristics of excellent process performance, stable mechanical property, high production efficiency, low comprehensive cost and the like, and can be widely applied to the industries of petrifaction, pressure vessels, ship building, steel structures, engineering machinery and the like. When flux-cored wire is used for gas shielded welding, the mixed gas ratio is adopted and CO is adopted₂The electric arc obtained during the welding of the protective gas is more stable and less splashed, the quality of the welding line is greatly improved, the cleaning time after welding is reduced, and the ultrasound is also improvedThe cost of the detection of the wave weld. The mixed gas has lower heat conduction capability than welding using CO2 shielding gas, so that it can maintain the heat and liquid state of the molten pool. This enables the molten pool to react more thoroughly, the weld leg portion of the weld to melt more easily and fully, and when welding at an unusual location (such as up hill or overhead welding), the mixed gas is more attractive because a less skilled welder can also better control the arc and the molten pool, indirectly increasing production efficiency.

The invention adopts the stainless steel flux-cored wire protected by slag and gas, the metal structure of the welding seam is austenite, and the welding wire has good welding process performance by adjusting the ratio of the flux-cored acid to the alkali oxide and the ratio of the potassium titanate, the sodium titanate and the fluoride, and is particularly suitable for welding austenitic stainless steel.

According to the invention, by adjusting the proportion of acidic and alkaline oxides in the flux core, gas in the molten pool can escape in time before the molten slag is solidified, and a slag layer formed after the molten slag is solidified uniformly covers the welding seam to effectively protect the welding seam from being eroded by the external environment; by adjusting the proportion of potassium titanate, sodium titanate and cryolite, the welding arc is stable in combustion, the molten drop transition is continuous, and the splashing is hardly generated in the welding process; the finally formed welding line has pure color and attractive appearance, does not need acid washing and later polishing, and is suitable for welding SUS304 and SUS304L steel with higher requirements on welding process performance, welding line quality and attractive appearance.

Definition and interpretation

Unless otherwise specified, the symbols are mass%.

Unless otherwise specified, all the articles used in the present invention are commercially available products.

Detailed Description

The present invention will be further described with reference to the following examples.

Example 1:

selecting 75kg of an ultra-low carbon stainless steel strip, wherein the ultra-low carbon stainless steel strip comprises the following components in percentage by mass: 0.014% of C, 1.33% of Mn, 0.29% of Si, 18.63% of Cr, 8.40% of Ni, 0.001% of Cu, 0.0023% of S, 0.013% of P, 0.025% of N, 0.0015% of Mo, and the balance of Fe and inevitable impurities.

The weight of each component in the medicine core is as follows: containing TiO₂96.52 percent of natural rutile, 0.022 percent of S, 0.027 percent of P and 0.8kg of natural rutile; containing SiO₂ 99.4％、Al₂ O₃4.5kg of quartz sand with the weight percentage of 0.33 percent, 0.019 percent of S and 0.023 percent of P; 0.25kg of cryolite containing 53.5 percent of F, 14 percent of Al and 31 percent of Na; containing K₂O 26.43％、TiO₂58.21%, S0.02%, P0.024% and potassium titanate 0.4 kg; containing Na₂O 16.57％、TiO₂75.29 percent, S0.021 percent and P0.054 percent of sodium titanate 1.2 kg; 1.4kg of electrolytic manganese containing 99.7 percent of Mn, 0.035 percent of C, 0.017 percent of S and 0.017 percent of P; 5.5kg of metal chromium containing 98.9 percent of Cr, 0.012 percent of C, 0.016 percent of S and 0.008 percent of P; 8.06kg of atomized iron powder containing 98.9 percent of Fe, 0.026 percent of C, 0.015 percent of S and 0.014 percent of P; 2.5kg of nickel powder containing 99.7 percent of Ni, 0.008 percent of C, 0.007 percent of S and 0.007 percent of P; containing Sb₂O₃0.04kg of 99.08 percent of stibium; containing Al₂O₃0.1kg of 99.95% calcined alpha alumina; 0.25kg of aluminum iron containing 53.94% of Al, 0.006% of S and 0.01% of P.

The flux core is prepared by uniformly mixing the components of the flux core according to the proportion, the flux core is subjected to heat preservation for 2-4 hours at the temperature of 200-250 ℃, is uniformly stirred, is wrapped in an ultra-low carbon stainless steel band by adopting the conventional forming process, is accurately drawn and reduced to the specified diameter of the welding wire by pure CRD (cross-linked direct drawing), is subjected to online annealing to eliminate work hardening and is subjected to cleaning treatment after oil stain on the surface of the welding wire is carbonized, then, a layer of lubricant is uniformly coated on the surface of the welding wire to ensure the wire feeding performance of the welding wire, and finally, the welding wire is wound into a No. 1 flux-cored wire through.

The No. 1 flux-cored wire is subjected to welding process evaluation and deposited metal welding test according to GB/T17853-1999 and AWS A5.22. The welding body base material was SUS304L austenitic stainless steel.

The welding process evaluation results are as follows: the welding arc of the No. 1 flux-cored wire is stable, the size of the welding seam is regular and attractive, the color is pure, no splash is left at the periphery of the base metal, the slag is removed well, and the deposition efficiency is 91.13%.

The deposited metal comprises the following components: 0.024 wt% of C, 1.39 wt% of Mn, 0.48 wt% of Si, 0.0031 wt% of S, 0.012 wt% of P, 18.72 wt% of Cr, 9.29 wt% of Ni, 0.037 wt% of Mo, 0.021 wt% of N, 0.015 wt% of Cu, and the balance of Fe and inevitable impurities.

Mechanical properties of deposited metal: (1) the X-ray flaw detection grade at normal temperature is I grade, the tensile strength Rm 602MPa and the elongation A38 percent; (2) according to the GB/T4334-2008E method and a stainless steel sulfuric acid-copper sulfate corrosion test method, the non-intergranular corrosion tendency of the weld metal of the flux-cored wire is determined.

Example 2:

in this example, except for the weight of each component in the flux core, the other conditions and the manufacturing process are the same as those of example 1, and a # 2 flux-cored wire is obtained.

In the embodiment, 75kg of an ultra-low carbon stainless steel strip is selected, a medicine core is taken, and the weight of each component in the medicine core is as follows: containing TiO₂96.52 percent, S0.022 percent and P0.027 percent of natural rutile 1.0 kg; containing SiO₂ 99.4％、Al₂ O₃5.6kg of quartz sand with the weight percentage of 0.33 percent, 0.019 percent of S and 0.023 percent of P; 0.43kg of cryolite containing 53.5 percent of F, 14 percent of Al and 31 percent of Na; containing K₂O 26.43％、TiO₂58.21%, S0.02%, P0.024% and potassium titanate 0.2 kg; containing Na₂O 16.57％、TiO₂75.29 percent, S0.021 percent and P0.054 percent of sodium titanate 0.97 kg; 1.7kg of electrolytic manganese containing 99.7 percent of Mn, 0.035 percent of C, 0.017 percent of S and 0.017 percent of P; 5kg of metal chromium containing 98.9 percent of Cr, 0.012 percent of C, 0.016 percent of S and 0.008 percent of P; 6.62kg of atomized iron powder containing 98.9 percent of Fe, 0.026 percent of C, 0.015 percent of S and 0.014 percent of P; 3kg of nickel powder containing 99.7 percent of Ni, 0.008 percent of C, 0.007 percent of S and 0.007 percent of P; containing Sb₂O₃0.06kg of 99.08 percent of stibium; containing Al₂O₃0.3kg of 99.95% calcined alpha alumina; 0.12kg of ferroaluminum containing 53.94% of Al, 0.006% of S and 0.01% of P.

And (3) carrying out welding process evaluation and deposited metal welding test on the No. 2 flux-cored wire according to GB/T17853-1999 and AWS A.22.

The welding process evaluation results are as follows: the welding arc of the No. 2 flux-cored wire is stable, the size of the welding seam is regular and attractive, the color is pure, no splash is left at the periphery of the base metal, the slag is removed well, and the deposition efficiency is 90.54%.

The deposited metal comprises the following components: 0.030 wt% of C, 1.51 wt% of Mn, 0.49 wt% of Si, 0.0027 wt% of S, 0.013 wt% of P, 18.57 wt% of Cr, 9.87 wt% of Ni, 0.038 wt% of Mo, 0.021 wt% of N, 0.012 wt% of Cu, and the balance of Fe and inevitable impurities. Mechanical properties of deposited metal: (1) the X-ray flaw detection grade at normal temperature is I grade, the tensile strength Rm 574MPa and the elongation A39 percent; (2) according to the GB/T4334-2008E method and a stainless steel sulfuric acid-copper sulfate corrosion test method, the non-intergranular corrosion tendency of the weld metal of the flux-cored wire is determined.

In conclusion, the mixed gas shielded austenitic stainless steel flux-cored wire developed by the invention simultaneously meets the corresponding technical requirements of the GB/T17853 standard and the E308LT1-4 type flux-cored wire in the AWS A5.22 standard. The flux-cored wire has stable welding arc combustion, continuous molten drop transition and almost no splashing in the welding process; the finally formed welding line has pure color and attractive appearance, does not need acid washing and later polishing, and is suitable for welding SUS304 and SUS304L steel with higher requirements on welding line quality and attractive appearance.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims

1. A special welding wire for mixed gas shielded austenitic stainless steel is composed of a sheath steel belt and a flux core, and is characterized in that the flux core comprises the following components in percentage by weight: 0.5 to 2.0 parts of natural rutile, 1.5 to 6.0 parts of quartz sand, 0.15 to 0.5 part of ice crystal powder, 0.2 to 0.6 part of potassium titanate, 0.8 to 1.3 parts of sodium titanate, 1.0 to 1.7 parts of electrolytic manganese, 5.0 to 7.0 parts of metallic chromium, 5.0 to 9.0 parts of atomized iron powder, 2.5 to 4.0 parts of nickel powder, 0.02 to 0.1 part of stibium, 0.1 to 0.4 part of calcined alpha alumina and 0.05 to 0.2 part of aluminum iron; the outer skin steel strip comprises the following components: less than or equal to 0.02 percent of C, less than or equal to 2.0 percent of Mn, less than or equal to 0.50 percent of Si, 18-20.0 percent of Cr and 8.0-12.0 percent of Ni; cu is less than or equal to 0.20 percent, S is less than or equal to 0.01 percent, P is less than or equal to 0.025 percent, N is less than or equal to 0.06 percent, Mo is less than or equal to 0.30 percent, and the balance is Fe and inevitable impurities, wherein the mass percent is.

2. The special welding wire for mixed gas shielded austenitic stainless steel according to claim 1, wherein: the weight of the flux core is 22-28% of the weight of the welding wire.

3. The welding wire special for mixed gas shielded austenitic stainless steel according to claim 1, wherein the sheath steel band comprises the following components: 0.014% of C, 1.33% of Mn, 0.29% of Si, 18.63% of Cr, 8.40% of Ni, 0.001% of Cu, 0.0023% of S, 0.013% of P, 0.025% of N, 0.0015% of Mo, and the balance Fe and inevitable impurities,% means mass%.

4. The special welding wire for mixed gas shielded austenitic stainless steel according to any one of claims 1 to 3, wherein: 1.0 part by weight of natural rutile, 5.6 parts by weight of quartz sand, 0.43 part by weight of ice crystal powder, 0.2 part by weight of potassium titanate, 0.97 part by weight of sodium titanate, 1.7 parts by weight of electrolytic manganese, 5.0 parts by weight of metallic chromium, 6.62 parts by weight of atomized iron powder, 3.0 parts by weight of nickel powder, 0.06 part by weight of stibium trioxide, 0.3 part by weight of calcined alpha alumina and 0.12 part by weight of aluminum iron.

5. The special welding wire for mixed gas shielded austenitic stainless steel according to any one of claims 1 to 3, wherein: the natural rutile is TiO-containing₂96.52%, S0.022%, P0.027% natural rutile, and quartz sand containing SiO₂99.4％、Al₂O₃0.33 percent of quartz sand, 0.019 percent of S and 0.023 percent of P, wherein the cryolite is cryolite containing 53.5 percent of F, 14 percent of Al and 31 percent of Na, and the potassium titanate is cryolite containing K₂O 26.43％、TiO₂58.21%, S0.02%, P0.024% of potassium titanate, and Na-containing sodium titanate₂O 16.57％、TiO₂75.29 percent, S0.021 percent and P0.054 percent of sodium titanate, the electrolytic manganese is the electrolytic manganese containing 99.7 percent of Mn, 0.035 percent of C, 0.017 percent of S and 0.017 percent of P, and the metallic chromium is the electrolytic manganese containing Cr98.9 percent of metallic chromium, 0.012 percent of C, 0.016 percent of S and 0.008 percent of P, wherein the atomized iron powder is the atomized iron powder containing 98.9 percent of Fe, 0.026 percent of C, 0.015 percent of S and 0.014 percent of P, the nickel powder is the nickel powder containing 99.7 percent of Ni, 0.008 percent of C, 0.007 percent of S and 0.007 percent of P, and the stibium bloom is the nickel powder containing Sb₂O₃99.08 percent of stibium trioxide, calcining alpha alumina to contain Al₂O₃99.95 percent of calcined alpha alumina, wherein the aluminum and iron are aluminum and iron containing 53.94 percent of Al, 0.006 percent of S and 0.01 percent of P, and the percent refers to the mass percent.

6. The special welding wire for mixed gas shielded austenitic stainless steel according to any one of claims 1 to 3, wherein: the welding wire is used for welding, and the components of welding deposited metal are as follows: 0.024-0.030% of C, 1.29-1.71% of Mn, 0.48-0.69% of Si, 0.0027-0.0031% of S, 0.012-0.013% of P, 18.57-19.69% of Cr, 9.24-9.98% of Ni, 0.037-0.038% of Mo, 0.021-0.028% of N, 0.012-0.015% of Cu, and the balance of Fe and inevitable impurities.

7. The preparation method of the special mixed gas shielded austenitic stainless steel welding wire as claimed in any one of claims 1 to 6, comprising the following steps:

uniformly mixing all components of the medicine core for later use;

8. A welding method of austenitic stainless steel, the welding method adopts the special welding wire of any claim 1-6 to weld the austenitic stainless steel, and the welding adopts argon-rich mixed gas shield welding.