A method for preparing a duplex stainless steel active agent and applications thereof

Abstract

The present application relates to the technical field of welding active agent, in particular to a preparation method of duplex stainless steel active agent and application thereof, comprising the following steps: mixing and stirring SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder to form a mixture; mixing the mixture with solvent A under high-speed stirring to form a slurry; performing ultrasonic treatment on the mixed slurry to ensure that each component is more uniformly dispersed in the mixture; performing drying treatment on the slurry after ultrasonic treatment to remove the solvent; performing high-temperature calcination on the dried material; after calcination, crushing and screening the product to obtain an active agent with a target particle size. The present application can not only improve the welding joint penetration, improve the welding production efficiency and reduce the production cost, but also significantly increase the austenite content after applying the active agent, and can improve the joint structure. Compared with the conventional TIG welding, the active TIG welding applies the active agent (A-TIG) on the surface to be welded, which can increase the penetration by more than 3 times compared with the conventional TIG welding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding activator, in particular to a preparation method of duplex stainless steel activator and application thereof. BACKGROUND

[0002] Duplex stainless steel has the characteristics of austenitic stainless steel and ferritic stainless steel, and its corrosion resistance and weldability are significantly improved, so it is widely used in important industrial fields such as chemical industry, ocean engineering, pulp and papermaking, oil and gas transportation, etc. In the application process of duplex stainless steel, welding is one of the important processing methods, among which TIG (Tungsten Inert Gas) is one of the most commonly used welding methods for duplex stainless steel. The traditional TIG welding can reach a depth of up to 3mm in single pass. However, for materials with a thickness greater than 3mm, edge preparation and multi-pass welding are required.

[0003] A-TIG welding technology is to apply a relatively thin layer of activator to the welding area before welding operation, without the need for wire feeding and beveling, and its penetration depth is usually 2-3 times that of traditional TIG welding. There is only one patent related to duplex stainless steel activator in the prior art, CN110170770A discloses a duplex stainless steel activator which can obtain a good duplex structure, but can only weld duplex stainless steel below 8mm, and the penetration depth cannot reach a deep penetration depth. SUMMARY

[0004] Based on the above purpose, the present application provides a preparation method of duplex stainless steel activator and application thereof.

[0005] A duplex stainless steel activator, comprising SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder, wherein the content of each component is as follows:

[0006] SiO2 accounts for 29-33% by mass;

[0007] Cr2O3 accounts for 10-14% by mass;

[0008] NaF accounts for 28-33% by mass;

[0009] MnO2 accounts for 14-20% by mass;

[0010] Al powder accounts for 3-5% by mass;

[0011] CaO accounts for 2-5% by mass;

[0012] Fe2O3 accounts for 1-3% by mass;

[0013] The above components are mixed in a specific ratio and undergo a series of reactions at high temperature to form a composite activator with high-efficiency welding performance and excellent heat resistance and corrosion resistance.

[0014] Further, the SiO2 content is 31%; the Cr2O3 content is 12%; the NaF content is 30%; the MnO2 content is 18%; the Al powder content is 4%; the CaO content is 3%; and the Fe2O3 content is 2%.

[0015] A method for preparing a duplex stainless steel active agent, comprising the following steps:

[0016] S1: mixing and stirring SiO2, Cr2O3, NaF, MnO2, Al powder, CaO, and Fe2O3 powder to form a mixture;

[0017] S2: mixing the mixture with solvent A under high-speed stirring to form a slurry;

[0018] S3: ultrasonic treatment of the mixed slurry to ensure more uniform dispersion of the components in the mixture;

[0019] S4: drying treatment of the ultrasonically treated slurry to remove the solvent;

[0020] S5: high-temperature calcination of the dried material;

[0021] S6: after calcination, crushing and sieving the product to obtain an active agent of target particle size.

[0022] Further, the ultrasonic treatment in S3 is as follows:

[0023] S31: preparation,

[0024] ensuring that all equipment and instruments have been cleaned and sterilized;

[0025] preparing the mixed slurry (mixed from SiO2, Cr2O3, NaF, MnO2, Al powder, CaO, and Fe2O3 according to a specific mass ratio, and has been mixed with an appropriate solvent);

[0026] S32: loading the sample,

[0027] pouring the mixed slurry into the ultrasonic treatment container;

[0028] setting the frequency of the ultrasonic treatment instrument to be within the range of 20-40 kHz;

[0029] setting the treatment time to be 5-20 minutes;

[0030] S33: start treatment,

[0031] placing the container into the ultrasonic treatment instrument;

[0032] turning on the instrument and starting the treatment;

[0033] During the processing, the mixed slurry is stirred periodically to ensure uniform processing;

[0034] S34: monitoring and adjustment,

[0035] During the processing, the state of the mixture is monitored in real time;

[0036] Fine-tune the frequency of the ultrasonic wave, the processing time.

[0037] Further, the solvent A is xylene, ethyl acetate or butanone.

[0038] Further, the SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder are all 200 mesh powders.

[0039] Further, the calcination in S6 is as follows:

[0040] S61: preparation,

[0041] Ensure that all equipment and containers used have been cleaned and preheated;

[0042] Prepare the high-temperature calcination furnace;

[0043] Prepare the ultrasonic treatment mixture;

[0044] S62: load the sample,

[0045] Load the dried mixture into a high-temperature-resistant ceramic tile or quartz boat;

[0046] S63: set parameters,

[0047] Set the temperature of the furnace in the range of 650-750℃;

[0048] Set the calcination time to 2-4 hours;

[0049] S64: start calcination,

[0050] Put the ceramic tile or quartz boat containing the sample into the furnace;

[0051] Slowly raise the temperature of the furnace to the preset calcination temperature;

[0052] After reaching the preset temperature, maintain the temperature and start timing;

[0053] S65: calcination is complete,

[0054] After the calcination time is up, turn off the furnace and slowly reduce the temperature to room temperature;

[0055] After the furnace cools to a safe temperature, remove the calcined product.

[0056] The application of a duplex stainless steel active agent, comprising the following steps:

[0057] Step one: mix the prepared active agent with solvent B and adjust into a viscous solution, and perform surface treatment on the plate;

[0058] Step two: evenly coat the active agent on the to-be-welded area with a brush, and the coating width is 20mm;

[0059] Step three: observe the thickness of the active agent coating to cover the metal luster;

[0060] Step four: perform surface treatment on the to-be-welded part, clean the surface of the to-be-welded part with sandpaper, and then wipe the surface of the plate with alcohol to remove burrs and impurities on the surface of the plate;

[0061] Step five: wait for the alcohol to evaporate and then perform welding.

[0062] Further, the solvent B is acetone or ethanol, and the welding process parameters are as follows: welding current 185A, welding speed 80mm / min, welding arc length 2mm, argon flow rate 13L / min, and tungsten electrode diameter 3.2mm.

[0063] Further, the weld penetration is 12.1-12.4mm.

[0064] The present application has the following beneficial effects:

[0065] The present application can increase the weld penetration of the welded joint, improve the welding production efficiency, reduce the production cost, significantly increase the austenite content after coating the active agent, and improve the joint structure.

[0066] Compared with the conventional TIG welding, the active TIG welding (A-TIG) coats the active agent (A-TIG) on the to-be-welded surface, which can increase the weld penetration by more than 3 times compared with the conventional TIG welding, improve the mechanical properties of the joint, is conducive to improving the welding production efficiency, reducing the welding production cost, and realizing 12mm single-sided welding and double-sided forming. BRIEF DESCRIPTION OF DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only illustrate the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0068] Figure 1 The present application is a preparation method flowchart;

[0069] Figure 2This is a schematic diagram illustrating the application of the present invention in welding processes according to an embodiment of the invention;

[0070] Figure 3 A schematic diagram of the microstructure of a traditional self-fusion welding (TIG) weld.

[0071] Figure 4 This is a schematic diagram of the microstructure of an autogenous welding (A-TIG) weld according to an embodiment of the present invention. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0073] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0074] Example 1

[0075] like Figures 1-2 As shown, a duplex stainless steel activator includes SiO2, Cr2O3, NaF, MnO2, Al powder, CaO, and Fe2O3 powder, wherein the content of each component in the following mass ratio is as follows:

[0076] The content of SiO2 is 31%; Cr2O3 is 12%; NaF is 30%; MnO2 is 18%; Al powder is 4%; CaO is 3%; and Fe2O3 is 2%.

[0077] The above components are mixed and then undergo a series of reactions at high temperature to form a composite activator with high fluxing performance and excellent heat resistance and corrosion resistance.

[0078] A method for preparing a duplex stainless steel activator includes the following steps:

[0079] S1: Mix SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder to form a mixture;

[0080] S2: Mix the mixture with solvent A under high-speed stirring to form a slurry;

[0081] S3: Subject the mixed slurry to ultrasonic treatment to ensure more uniform dispersion of the components in the mixture;

[0082] S4: Dry the ultrasonically treated slurry to remove the solvent;

[0083] S5: Subject the dried material to high-temperature calcination;

[0084] S6: After calcination, crush and sieve the product to obtain the active agent of target particle size.

[0085] The ultrasonic treatment in S3 is as follows:

[0086] S31: Preparation,

[0087] Ensure that all equipment and instruments have been cleaned and sterilized;

[0088] Prepare the mixed slurry (mixed from SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 according to the predetermined mass ratio, and has been mixed with the appropriate solvent);

[0089] S32: Load the sample,

[0090] Pour the mixed slurry into the ultrasonic treatment container;

[0091] Set the frequency of the ultrasonic treatment instrument in the range of 20 kHz;

[0092] Set the treatment time to 20 minutes;

[0093] S33: Start treatment,

[0094] Put the container into the ultrasonic treatment instrument;

[0095] Turn on the instrument and start the treatment;

[0096] During the treatment, periodically stir the mixed slurry to ensure uniform treatment;

[0097] S34: Monitoring and adjustment,

[0098] During the treatment, monitor the state of the mixture in real time;

[0099] Fine-tune the frequency of the ultrasonic waves, the treatment time.

[0100] Solvent A is dimethylbenzene.

[0101] SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder are all 200 mesh powders. The calcination in S6 is as follows:

[0102] S61: Preparation,

[0103] Ensure that all equipment and containers used are clean and preheated;

[0104] Prepare the high-temperature calcination furnace;

[0105] Prepare the ultrasonic treatment mixture;

[0106] S62: Load the sample,

[0107] Load the dried mixture into a high-temperature resistant ceramic tile or quartz boat;

[0108] S63: Set parameters,

[0109] Set the temperature of the furnace to be within the range of 650°C;

[0110] Set the calcination time to be 4 hours;

[0111] S64: Start calcination,

[0112] Place the ceramic tile or quartz boat containing the sample into the furnace;

[0113] Slowly raise the temperature of the furnace to the preset calcination temperature;

[0114] After reaching the preset temperature, maintain the temperature and start timing;

[0115] S65: Calcination is complete,

[0116] After the calcination time is up, turn off the furnace and slowly reduce the temperature to room temperature;

[0117] After the furnace has cooled to a safe temperature, remove the calcined product.

[0118] The application of a duplex stainless steel active agent, comprising the following steps:

[0119] Step one: mix the prepared active agent with solvent B and adjust it to a viscous solution, and perform surface treatment on the plate;

[0120] Step two: evenly apply the active agent to the welding area with a brush, with a coating width of 20mm;

[0121] Step three: observe the thickness of the active agent coating to cover the metal luster;

[0122] Step four: perform surface treatment on the welding part, clean the surface of the welding part with sandpaper, and then wipe the surface of the plate with alcohol to remove burrs and impurities on the surface of the plate;

[0123] Step five: wait for alcohol to evaporate before welding.

[0124] Solvent B is acetone, and the welding process parameters are: welding current 185 A, welding speed 80 mm / min, welding arc length 2 mm, argon flow rate 13 L / min, and tungsten electrode diameter 3.2 mm.

[0125] The weld penetration is 12.4 mm.

[0126] Example 2

[0127] A duplex stainless steel active agent, comprising SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder, wherein the content of each component is as follows:

[0128] The content of SiO2 is 33%; the content of Cr2O3 is 10%; the content of NaF is 33%; the content of MnO2 is 14%; the content of Al powder is 5%; the content of CaO is 2%; and the content of Fe2O3 is 3%.

[0129] After mixing the above components, a series of reactions are carried out at high temperature to form a composite active agent with high efficiency of welding performance and excellent heat resistance and corrosion resistance.

[0130] A duplex stainless steel active agent preparation method, comprising the following steps:

[0131] S1: mixing and stirring SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder to form a mixture;

[0132] S2: mixing the mixture with solvent A under high-speed stirring to form a slurry;

[0133] S3: ultrasonic treatment of the mixed slurry to ensure more uniform dispersion of each component in the mixture;

[0134] S4: drying the ultrasonically treated slurry to remove the solvent;

[0135] S5: high-temperature calcination of the dried material;

[0136] S6: after calcination, the product is crushed and sieved to obtain an active agent with a target particle size.

[0137] The ultrasonic treatment in S3 is as follows:

[0138] S31: preparation,

[0139] Ensure that all equipment and instruments have been cleaned and sterilized;

[0140] Prepare the mixed slurry;

[0141] S32: loading the sample,

[0142] Pour the mixed slurry into the ultrasonic treatment container;

[0143] Set the frequency of the ultrasonic treatment instrument in the range of 30 kHz;

[0144] Set the treatment time to 12 minutes;

[0145] S33: start processing,

[0146] Put the container into the ultrasonic treatment instrument;

[0147] Turn on the instrument and start processing;

[0148] During the processing, periodically stir the mixed slurry to ensure uniform processing;

[0149] S34: monitoring and adjustment,

[0150] During the processing, monitor the state of the mixture in real time;

[0151] Fine-tune the frequency of the ultrasonic waves, the processing time.

[0152] Solvent A is ethyl acetate.

[0153] SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder are all 200 mesh powders.

[0154] The calcination in S6 is as follows:

[0155] S61: preparation,

[0156] Ensure that all equipment and containers used have been cleaned and preheated;

[0157] Prepare the high-temperature calcination furnace;

[0158] Prepare the ultrasonic treatment mixture;

[0159] S62: loading the sample,

[0160] Load the dried mixture into high-temperature-resistant ceramic tiles or quartz boats;

[0161] S63: set parameters,

[0162] Set the temperature of the furnace in the range of 700°C;

[0163] Set the calcination time to 3 hours;

[0164] S64: start calcination,

[0165] Put the tile or quartz boat with the sample into the furnace;

[0166] Slowly raise the temperature of the furnace to the preset calcination temperature;

[0167] After reaching the preset temperature, keep the temperature and start timing;

[0168] S65: Calcination is completed:

[0169] After the calcination time is over, turn off the furnace and slowly reduce the temperature to room temperature;

[0170] After the furnace cools down to a safe temperature, take out the calcined product.

[0171] Application of a duplex stainless steel active agent, comprising the following steps:

[0172] Step one: mix the prepared active agent with solvent B and adjust it into a viscous solution, and perform surface treatment on the plate;

[0173] Step two: evenly apply the active agent to the welding area with a brush, with a coating width of 20 mm;

[0174] Step three: observe the thickness of the active agent coating to cover the metal luster;

[0175] Step four: perform surface treatment on the welding part, clean the surface of the welding part with sandpaper, and then wipe the surface of the plate with alcohol to remove burrs and impurities on the surface of the plate;

[0176] Step five: wait for the alcohol to evaporate and then perform welding.

[0177] Solvent B is ethanol, and the welding process parameters are: welding current 185 A, welding speed 80 mm / min, welding arc length 2 mm, argon flow rate 13 L / min, and tungsten electrode diameter 3.2 mm.

[0178] The weld penetration is 12.3 mm.

[0179] Example 3

[0180] A duplex stainless steel active agent, comprising SiO2, Cr2O3, NaF, MnO2, Al powder, CaO, and Fe2O3 powder, wherein the content of each component is as follows:

[0181] The content of SiO2 is 29%; the content of Cr2O3 is 14%; the content of NaF is 28%; the content of MnO2 is 20%; the content of Al powder is 3%; the content of CaO is 5%; and the content of Fe2O3 is 1%.

[0182] After mixing the above components, a series of reactions are carried out at high temperature to form a composite active agent with high-efficiency welding performance and excellent heat resistance and corrosion resistance.

[0183] A method for preparing a duplex stainless steel active agent, comprising the following steps:

[0184] S1: mixing and stirring SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder to form a mixture;

[0185] S2: mixing the mixture with solvent A under high-speed stirring to form a slurry;

[0186] S3: ultrasonic treatment of the mixed slurry to ensure more uniform dispersion of components in the mixture;

[0187] S4: drying the ultrasonically treated slurry to remove the solvent;

[0188] S5: high-temperature calcination of the dried material;

[0189] S6: after calcination, crushing and screening the product to obtain the active agent of the target particle size.

[0190] The ultrasonic treatment in S3 is as follows:

[0191] S31: preparation,

[0192] Ensure that all equipment and instruments have been cleaned and sterilized;

[0193] Prepare the mixed slurry;

[0194] S32: load the sample,

[0195] Pour the mixed slurry into the ultrasonic treatment container;

[0196] Set the frequency of the ultrasonic treatment instrument to be within the range of 40 kHz;

[0197] Set the treatment time to 5 minutes;

[0198] S33: start processing,

[0199] Put the container into the ultrasonic treatment instrument;

[0200] Turn on the instrument and start processing;

[0201] During the processing, periodically stir the mixed slurry to ensure uniform processing;

[0202] S34: monitoring and adjustment,

[0203] During the processing, monitor the state of the mixture in real time;

[0204] Fine-tune the frequency of the ultrasonic wave, the processing time.

[0205] Solvent A is butanone.

[0206] SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder are all 200 mesh powder. The calcination in S6 is as follows:

[0207] S61: Preparation,

[0208] Ensure that all equipment and containers used are clean and preheated;

[0209] Prepare the high-temperature calcination furnace;

[0210] Prepare the ultrasonic treatment mixture;

[0211] S62: Load the sample,

[0212] Load the dried mixture into a high-temperature resistant ceramic tile or quartz boat;

[0213] S63: Set parameters,

[0214] Set the temperature of the furnace to be within the range of 750°C;

[0215] Set the calcination time to be 2 hours;

[0216] S64: Start calcination,

[0217] Put the ceramic tile or quartz boat containing the sample into the furnace;

[0218] Slowly raise the temperature of the furnace to the preset calcination temperature;

[0219] After reaching the preset temperature, maintain the temperature and start timing;

[0220] S65: Calcination is complete:

[0221] After the calcination time is up, turn off the furnace and slowly reduce the temperature to room temperature;

[0222] After the furnace has cooled to a safe temperature, remove the calcined product.

[0223] The application of a duplex stainless steel active agent, comprising the following steps:

[0224] Step one: mix the prepared active agent with solvent B and adjust it into a viscous solution, and perform surface treatment on the plate;

[0225] Step two: evenly apply the active agent to the welding area with a brush, with a coating width of 20mm;

[0226] Step three: observe the thickness of the active agent coating to cover the metal luster;

[0227] Step four: surface treatment is performed on the to-be-welded piece, the surface of the to-be-welded piece is cleaned with sandpaper, and then the surface of the plate is scrubbed with alcohol to remove burrs and impurities on the surface of the plate;

[0228] Step five: welding is performed after waiting for the alcohol to evaporate.

[0229] The solvent B is ethanol, and the welding process parameters are: a welding current of 185 A, a welding speed of 80 mm / min, a welding arc length of 2 mm, an argon flow rate of 13 L / min, and a tungsten electrode diameter of 3.2 mm.

[0230] The weld penetration is 12.1 mm.

[0231] Table 1: Comparison of data of Example 1, Example 2 and Example 3

[0232]

[0233]

[0234] Comparative Example 1

[0235] As Figures 3-4 shown:

[0236] A 20 mm thick 2205 duplex stainless steel plate is welded, and the welding process parameters are: a welding current of 190 A, a welding speed of 100 mm / min, a tungsten electrode diameter of 3.2 mm, an argon flow rate of 13 L / min, and an arc length of 2 mm. The difference from the embodiment is that there is no active agent coating, and it is a conventional TIG self-melting welding. After butt welding, the plate is air-cooled, cut, inlaid, polished and etched, and the penetration and width of the joint are measured to obtain the relationship between the active agent and the weld penetration and width. The weld structure is analyzed, as Figure 3 shown.

[0237] As Figure 3 can be seen, the conventional TIG self-melting welding weld structure is mainly ferrite, the ferrite grain size is not uniform, the ferrite content is more than 90%, and only a small amount of austenite is precipitated from the ferrite grain boundary, which destroys the two-phase balance of the 2205 duplex stainless steel.

[0238] As Figure 4 can be seen, using the active agent of the present application for welding, the austenite content in the joint weld structure is significantly increased, a large amount of austenite is precipitated from the ferrite grain boundary, completely surrounding the ferrite, and strip-shaped austenite and fine intragranular austenite also appear in the ferrite, and the austenite content reaches 33.4%. The two-phase balance of the 2205 duplex stainless steel weld structure is the key to ensuring the performance of the joint.

[0239] Those skilled in the art should understand that the above discussion of any embodiment is merely exemplary in nature and is not intended to imply that the present application is limited to these examples; any of the above embodiments or technical features among different embodiments can be combined, and steps can be implemented in any order, under the idea of the present application, and there are many other changes of different aspects of the present application as described above, which are not provided in details for the sake of brevity.

[0240] The present application is intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the claims. Accordingly, any and all such alternatives, modifications and variations should be included within the scope of the present application.

Claims

1. A duplex stainless steel activator, characterized in that, It includes SiO2, Cr2O3, NaF, MnO2, Al powder, CaO, and Fe2O3 powder, with the following content for each component: SiO2 accounts for 31% of the mass; Cr2O3 accounts for 12% by mass; NaF accounts for 30% of the mass; MnO2 accounts for 18% of the mass; Al powder accounts for 4% of the total mass. CaO accounts for 3% by mass; Fe2O3 accounts for 2% by mass; The above components are mixed in a specific ratio and subjected to a series of reactions at high temperature to form a composite activator with high fluxing performance and excellent heat resistance and corrosion resistance. The preparation method of the duplex stainless steel activator includes the following steps: S1: Mix SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder to form a mixture; S2: Under high-speed stirring, the mixture is mixed with solvent A to form a slurry; S3: The mixed slurry is ultrasonically treated to ensure that the components are more evenly dispersed in the mixture; S4: The ultrasonically treated slurry is dried to remove the solvent; S5: The dried material is calcined at high temperature; S6: After calcination, the product is crushed and sieved to obtain the activator with the target particle size.

2. The duplex stainless steel activator according to claim 1, characterized in that, The ultrasonic treatment in S3 is as follows: S31: Preparations Ensure all equipment and instruments have been cleaned and sterilized; Prepare the mixed slurry; S32: Load the sample. Pour the mixed slurry into the ultrasonically treated container; Set the frequency of the ultrasonic processor to the range of 20-40 kHz; Set the processing time to 5-20 minutes; S33: Start processing. Place the container into the ultrasonic processor; Turn on the instrument and begin processing; During the processing, the slurry is periodically stirred and mixed to ensure uniform treatment; S34: Monitoring and Adjustment The state of the mixture is monitored in real time during the processing; Fine-tune the frequency and processing time of the ultrasound.

3. The duplex stainless steel activator according to claim 2, characterized in that, Solvent A is xylene, ethyl acetate, or butanone.

4. The duplex stainless steel activator according to claim 3, characterized in that, The SiO2, Cr2O3, NaF, MnO2, Al powder, CaO and Fe2O3 powder are all 200-mesh powders.

5. The duplex stainless steel activator according to claim 4, characterized in that, The calcination in S6 is specifically as follows: S61: Preparations Ensure that all equipment and containers used have been cleaned and preheated; Prepare a high-temperature calcining furnace; Prepare the ultrasonically treated mixture; S62: Load the sample. The dried mixture is then packed into heat-resistant ceramic or quartz containers. S63: Set parameters Set the furnace temperature within the range of 650-750℃; Set the calcination time to 2-4 hours; S64: Begin calcination. Place the ceramic tile or quartz boat containing the sample into the furnace; Slowly raise the furnace temperature to the preset calcination temperature; Once the preset temperature is reached, maintain that temperature and start timing; S65: Calcination complete. After the calcination time is over, turn off the furnace and slowly lower the temperature to room temperature; After the furnace has cooled to a safe temperature, remove the calcined product.

6. The application of a duplex stainless steel activator as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Mix the prepared activator with solvent B and adjust it into a viscous solution; then perform surface treatment on the board. Step 2: Use a brush to evenly apply the activator to the area to be soldered, with a coating width of 20mm; Step 3: Observe the thickness of the surfactant coating to cover the metallic luster; Step 4: Perform surface treatment on the parts to be welded. Clean the surface of the parts to be welded with sandpaper, and then wipe the surface of the board with alcohol to remove burrs and impurities. Step 5: After the alcohol has evaporated, proceed with the welding to form a weld.

7. The application of the duplex stainless steel activator according to claim 6, characterized in that, The solvent B is acetone or ethanol, and the welding process parameters in step five are: welding current 185A, welding speed 80mm / min, welding arc length 2mm, argon flow rate 13L / min, and tungsten electrode diameter 3.2mm.

8. The application of the duplex stainless steel activator according to claim 7, characterized in that, The weld penetration depth is 12.1-12.4 mm.

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