Preparation and use method of an activator welding strip capable of increasing welding penetration

Abstract

The present invention discloses a method for preparing and using an activator welding strip capable of increasing welding penetration. The activator powder is composed of 32%-38% B 2 O 3 Powder, 36%‑38% TiO 2 Powder, 9%‑16% MoSi 2 Powder, 3%‑5% SiO 2 Powder, 3%‑5% Cr 2 O 3 The activator powder is composed of 4%-6% NiO powder and 1%-4% Nb+V microalloy powder. The activator powder and the organic diluent are modulated in a ratio of 100g:40-60ml, and then filled into the welding strip structure for A-TIG welding. The adoption of this scheme can not only increase the welding penetration and improve the welding efficiency, but also solve the quality problem of unstable penetration caused by uneven coating thickness during manual brush coating, mechanical automatic coating and gas spray coating in the current activator welding field.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and more particularly to a method for preparing and using an activator welding strip capable of increasing welding penetration. Background Art

[0002] Active TIG welding (A-TIG welding for short) is a new and efficient welding method that increases weld penetration by using the surface tension gradient of active materials and arc contraction in ordinary tungsten inert gas welding. Compared with traditional TIG welding, under the same parameter conditions, A-TIG welding can increase weld penetration by 2-3 times, has the advantages of improving welding efficiency and reducing production costs, and has attracted extensive attention from scholars in the industry.

[0003] In A-TIG welding technology, the formulation and coating method of the activator are the key points in the industry, and are also the main reasons why it is difficult to industrialize and promote its application. The Chinese invention patent with the prior art application number of 201010117476.5 discloses a vapor mist activated flux for increasing welding penetration and a spraying method thereof. The method is applied by vapor mist spraying, which is simple and efficient, but the width and thickness of the coating are difficult to control and are prone to waste. In addition, too thick or too thin coating thickness will affect the depth of the weld, ultimately resulting in poor stability of welding quality. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to address the deficiencies in the prior art and to provide a method for preparing and using an activator welding strip that can increase welding penetration, which can not only increase the penetration of carbon steel and stainless steel welds and improve welding efficiency, but also provide an effective activator coating method, thereby ensuring the stability of welding quality.

[0005] Technical solution: The method for preparing an activator welding strip capable of increasing welding penetration of the present invention comprises:

[0006] S1. Preparation of active agent powder:

[0007] The active agent includes a mixed active agent powder and an organic diluent, and the mixed active agent powder and the organic diluent are prepared in a ratio of 100g:40-60ml;

[0008] The mixed active agent powder includes the following components in mass fraction ratio: SiO 2 Powder: 3%-5%, TiO 2 Powder: 36%-38%, B 2 O 3 Powder: 32%-38%, MoSi 2 Powder: 9%-16%, Cr 2 O 3Powder: 3%-5%, NiO powder: 4%-6%, Nb+V microalloy powder: 1%-5%.

[0009] The organic diluent comprises a binder and an organic solvent, and the content ratio of the organic solvent to the binder is 4:1;

[0010] The binder comprises a sodium silicate standard solution, the model of the sodium silicate standard solution is liquid-2, and the SiO 2 Mole number and NaO 2 The molar ratio is 3.1-3.4;

[0011] The organic solvent includes one of alcohol, anhydrous ethanol or acetone;

[0012] The B 2 O 3 Powder purity greater than 98%, particle size 45μm≤≤80μm; TiO 2 Powder purity greater than 99%, particle size 62μm≤≤106μm; MoSi 2 Powder purity greater than 99.8%, particle size 45μm≤≤74μm; SiO 2 Purity greater than 98.5%, particle size 96μm≤≤325μm; Cr 2 O 3 Purity greater than 99%, particle size ≤74μm≤125μm; NiO powder purity greater than 99%, particle size ≤74μm; Nb+V microalloy powder purity greater than 99.5%, particle size ≤74μm≤105μm;

[0013] Wherein, after mixing and grinding, the mixed active agent powder is sampled and screened according to the following particle sizes: 48 μm≤particle size≤62 μm, 80-90 wt%; 62 μm<particle size<109 μm, 5-19 wt%; 38≤particle size<48 μm, 1-5 wt%;

[0014] S2. Preparation of activator welding strip:

[0015] Fill the prepared active agent into the welding tape, seal it and store it in rolls;

[0016] The welding strip includes a lower base layer, an active agent layer, an upper base layer, an adhesive layer and an isolation layer which are arranged in sequence from bottom to top, and the isolation layer can be peeled off from the adhesive layer. The active agent layer includes card edges arranged on both sides of the lower base layer and the paper upper base layer close to each other, and the corresponding card edges are butt-jointed with each other, and a cavity is formed between all the card edges, and the active agent is filled in the cavity.

[0017] Furthermore, the thickness of the active agent is 4-10 mg / cm 2, width 13-20cm evenly distributed in the cavity.

[0018] Furthermore, the lower base layer is provided with a plurality of air holes connected to the active agent layer, and the pore diameter of the air holes is less than 25 μm.

[0019] Furthermore, the adhesive layer includes two adhesive strips, and the two adhesive strips are connected to two sides of the upper base layer.

[0020] Furthermore, the lower base layer and the upper base layer are both made of industrial waterproof masking paper, 0.1-0.12 mm thick and 25 cm wide, the adhesive strip is made of high temperature resistant hot melt pressure sensitive adhesive, 2-2.5 cm wide, and the isolation layer is polypropylene, 0.2-0.3 mm thick and 25 cm wide.

[0021] A method for using an activating flux welding strip capable of increasing welding penetration, comprising:

[0022] According to the length of the weld, press the activator welding strip tightly onto the weld surface along the center direction of the weld through the adhesive layer, tear off the isolation layer, and wait for the organic solvent to evaporate through the vent holes before welding.

[0023] The invention discloses an application of an activating flux welding strip capable of increasing welding penetration, wherein the activating flux welding strip is suitable for welding I-type butt full penetration welds, partial penetration fillet welds and repair welds of carbon steel and stainless steel materials in all positions and with a wall thickness within 10 mm.

[0024] Beneficial effects:

[0025] (1) The active flux welding composition provided by this scheme not only meets the welding material selection principle for low carbon steel and austenitic stainless steel welding, but also the metal oxide in the active flux is ionized into Ti under high temperature arc. 2+ Cr 3+ 、Ni 2+ Surface active elements such as O and Si in non-metallic oxides and adhesives can promote the increase of weld penetration alone or together through electromagnetic contraction or surface tension. 2 It helps to lower the melting point of the sample and improve the release of sulfur in the metal. Microalloy powder Nb+V can improve the toughness and corrosion resistance of the weld and is a stabilizing element for metal materials;

[0026] (2) The activator welding tape provided by this scheme encapsulates the activator in a cavity structure, and there is no need to prepare or apply the activator before welding. In addition, since the area and size of the cavity are fixed, the thickness of the activator is set accurately and evenly, which can not only solve the quality problems of uneven coating, cost waste and even unstable welding penetration in the current activator welding field using brush manual coating and gas spray coating. In addition, the activator welding tape provided by this scheme can be sealed and stored in a roll form, which is easy to carry, quick and efficient to use, and has far-reaching prospects for promoting large-scale industrialization in the field of domestic activator welding;

[0027] (3) The activating agent and flux belt provided in this scheme that can increase the penetration depth are suitable for full-position, I-type butt full-penetration welds of carbon steel and stainless steel materials with a wall thickness of less than 10 mm, partial-penetration deep-penetration fillet welds, and remelting repair of repair welds. It not only has extremely high welding efficiency, but also has strong high-throughput. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a planed interface diagram of the active flux belt of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the lower base layer of the present invention;

[0030] Figure 3 It is a schematic diagram of the welding structure of the activator welding strip of the present invention.

[0031] In the figure, 1, lower base layer; 11, air vent; 2, upper base layer; 3, card edge; 31, cavity; 4, adhesive strip; 5, isolation layer. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.

[0033] Embodiment 1: The present invention provides a method for preparing an activator welding strip capable of increasing welding penetration, including S1-S2, which are specifically as follows:

[0034] S1. Preparation of active agent powder

[0035] The active agent includes mixed active agent powder and organic diluent, and the mixed active agent powder and organic diluent are prepared in a ratio of 100g:40-60ml;

[0036] The mixed active agent powder includes the following components in mass fraction ratio: B 2 O 3 Powder: 35%; TiO 2 Powder: 37%; MoSi 2 Powder: 13%; SiO 2Powder: 4%; Cr 2 O 3 Powder: 4%; NiO powder: 5%; Nb+V microalloy powder: 2%.

[0037] The organic diluent includes a binder and an organic solvent, wherein the content ratio of the organic solvent to the binder is 4:1; the binder includes a sodium silicate standard solution, wherein the model of the sodium silicate standard solution is liquid-2, and the SiO 2 Mole number and NaO 2 The molar ratio is 3.1-3.4, and the organic solvent includes one of alcohol, anhydrous ethanol or acetone.

[0038] The purity and particle size of the active agent powder are selected according to the following levels: B 2 O 3 Purity above 98%, particle size 53μm≤≤62μm; TiO 2 Purity above 99%, particle size 80μm≤≤86μm; MoSi 2 Purity above 99.8%, particle size 58μm≤≤74μm; SiO 2 Purity above 98.5%, particle size 113μm≤≤150μm; Cr 2 O 3 Purity is above 99%, particle size is 90μm≤≤96μm; NiO purity is above 99%, particle size is 53≤≤74μm; Nb+V purity is above 99.5%, particle size is 80μm≤≤90μm.

[0039] The mixed active agent powder was mixed and ground for 15 minutes, and then screened and configured according to the following particle sizes: 48 μm ≤ particle size ≤ 62 μm, 86 wt%; 62 μm < particle size < 109 μm, 11 wt%; 38 ≤ particle size < 48 μm, 3 wt%;

[0040] Preferably, the active agent powder that can increase the melting depth and the organic diluent are prepared in a ratio of 100g:50ml.

[0041] The organic diluent is prepared by mixing a liquid organic solvent and a binder in a ratio of 4:1. The binder is a high-quality sodium silicate standard solution, model: Liquid-2, containing components of SiO 2 Mole number and NaO 2 The molar ratio is 3.2.

[0042] S2. Preparation of activator welding strip:

[0043] Fill the prepared active agent into the welding tape, seal it and store it in rolls;

[0044] Combination Figure 1-Figure 3It can be seen that the activator welding strip structure comprises, from bottom to top, a lower base layer 1, an activator layer, an upper base layer 2, an adhesive layer, and an isolation layer 5. The activator layer is filled with an activator that can increase the penetration depth, that is, the activator is located between the lower base layer 1 and the upper base layer 2, and there is no need to apply the activator on site before welding.

[0045] The active agent layer is composed of the card edges 3 arranged on both sides of the lower base layer 1 and the upper base layer 2 close to each other, and the corresponding card edges 3 are butted against each other, and a cavity 31 is formed between all the card edges 3, and the active agent is filled in the cavity 31. It can be understood that the active agent is wrapped by the card edges 3 of the lower base layer 1 and the card edges 3 of the upper base layer 2, and remains in the cavity 31. Since the area in the cavity 31 is fixed, the thickness of the active agent in the cavity 31 is also fixed, that is, the thickness of the active agent is not only accurately set, but also relatively uniform.

[0046] The thickness of the active agent layer that can increase the melting depth is 4-10mg / cm 2 , 13-20 cm in width and evenly distributed in the cavity 31. Preferably, the thickness of the active agent coating is 7-9 mg / cm 2 , width 15-18 cm; most preferably, the thickness of the active agent coating is 8 mg / cm 2 , width is 17cm.

[0047] The lower substrate 1 is provided with a plurality of air holes 11 connected to the active agent layer, and the diameter of the air holes 11 is less than 25 μm.

[0048] The adhesive layer includes two adhesive strips 4 , and the two adhesive strips 4 are connected to two sides of the upper base layer 2 .

[0049] The side of the lower substrate 1 away from the active agent layer is connected with an isolation layer 5, and the isolation layer 5 is sealed and bonded to the lower substrate 1 and can be peeled off.

[0050] The lower base layer 1 and the upper base layer 2 are both made of industrial waterproof masking paper, 0.1-0.12 mm thick and 25 cm wide. The adhesive strip 4 is made of high temperature resistant hot melt pressure sensitive adhesive, 2-2.5 cm wide. The isolation layer 5 is polypropylene, 0.2-0.3 mm thick and 25 cm wide.

[0051] The organic solvent is alcohol.

[0052] The method of using the activator welding tape that can increase the welding penetration is as follows: according to the length of the weld, the activator welding tape is pressed and applied to the surface of the weld test plate along the center direction of the weld through the adhesive strip 4, and the isolation layer 5 is torn off. After the organic solvent evaporates through the air vents 11, the appropriate welding parameters are set according to the plate thickness, and A-TIG welding is used.

[0053] There is no specific limitation on the welding process parameters in the present invention, but the set process parameters are preferably: welding current 160-190A, welding speed 38-48mm / min, arc length 2.6-3.4mm, argon gas flow 14-18L / min, tungsten electrode diameter 3.2mm.

[0054] The selection of the active agent components in this embodiment not only meets the principle of selecting welding materials for low carbon steel and austenitic stainless steel welding, but also the metal oxides in the active agent are ionized into Ti under high temperature arc. 2+ Cr 3+ 、Ni 2+ Surface active elements such as O and Si in non-metallic oxides and adhesives can promote the increase of weld penetration alone or together through electromagnetic contraction or surface tension. 2 It helps to lower the melting point of the sample and improve the release of sulfur in the metal. It can not only improve the strength of low-alloy steel welds, but also improve the corrosion resistance of austenitic stainless steel welds and reduce welding hot cracks. Micro-alloy powder Nb+V can improve the toughness and corrosion resistance of welds and is a stabilizing element for metal materials.

[0055] In this example, the activator is encapsulated in the cavity 31. During welding, there is no need to apply the activator. Since the area in the cavity 31 is fixed, the thickness of the activator in the cavity 31 will also be fixed, that is, the thickness of the activator is relatively uniform, which solves the quality problems of uneven coating thickness, cost waste and even unstable welding penetration during manual brush coating, mechanical automatic coating and gas spray coating in the current activator welding field, thereby improving the welding quality. In addition, the activator welding strip provided by this solution can be sealed and stored in the form of a roll, which is easy to carry, has a simple formula and low cost, and has far-reaching prospects for promoting large-scale industrialization in the field of domestic activator welding.

[0056] The invention discloses an application of an activator welding strip which can increase the welding penetration. The activator welding strip is suitable for welding of I-type butt full penetration welds, partial penetration fillet welds and repair welds of carbon steel and stainless steel materials in all positions and with a wall thickness of less than 10 mm. The activator welding strip not only has extremely high welding efficiency but also has strong high penetration.

[0057] Example 2: An activator capable of increasing welding penetration and a method for preparing an activator welding strip thereof. The difference from Example 1 is that:

[0058] S1. Preparation of active agent powder

[0059] The active agent includes mixed active agent powder and organic diluent, and the mixed active agent powder and organic diluent are prepared in a ratio of 100g:40-60ml;

[0060] The mixed active agent powder includes the following components in mass fraction ratio: B 2 O 3 Powder: 32%; TiO 2 Powder: 38%; MoSi 2 Powder: 16%; SiO 2 Powder: 3%; Cr 2 O 3 Powder: 3%; NiO powder: 4%; Nb+V microalloy powder: 4%.

[0061] The organic diluent includes a binder and an organic solvent, wherein the content ratio of the organic solvent to the binder is 4:1; the binder includes a sodium silicate standard solution, wherein the model of the sodium silicate standard solution is liquid-2, and the SiO 2 Mole number and NaO 2 The molar ratio is 3.1-3.4, and the organic solvent includes one of alcohol, anhydrous ethanol or acetone.

[0062] The purity and particle size of the active agent powder are selected according to the following levels: B 2 O 3 Purity above 98%, particle size 55μm≤≤70μm; TiO 2 Purity above 99%, particle size 74μm≤≤90μm; MoSi 2 Purity above 99.8%, particle size ≤58μm≤74μm; SiO2 purity above 98.5%, particle size ≤106μm≤212μm; Cr 2 O 3 Purity is above 99%, particle size is 86μm≤≤109μm; NiO purity is above 99%, particle size is 53μm≤≤74μm; Nb+V purity is above 99.5%, particle size is 80μm≤≤90μm.

[0063] The active agent powder capable of increasing the melting depth is mixed and ground for 20 minutes, and then screened and configured according to the following particle sizes: 48 μm≤particle size≤62 μm, 80 wt%; 62 μm<particle size<109 μm, 19 wt%; 38≤particle size<48 μm, 1 wt%.

[0064] Preferably, the active agent powder that can increase the melting depth and the organic diluent are prepared in a ratio of 100g:40ml.

[0065] The organic diluent is prepared by mixing a liquid organic solvent and a binder in a ratio of 4:1. The binder is a high-quality sodium silicate standard solution, model: Liquid-2, containing components of SiO 2 Mole number and NaO 2 The molar ratio is 3.1.

[0066] S2. Preparation of activator welding strip:

[0067] Fill the prepared active agent into the welding tape, seal it and store it in rolls;

[0068] Combination Figure 1-Figure 3 It can be seen that the activator welding strip structure comprises, from bottom to top, a lower base layer 1, an activator layer, an upper base layer 2, an adhesive layer, and an isolation layer 5. The activator layer is filled with an activator that can increase the penetration depth, that is, the activator is located between the lower base layer 1 and the upper base layer 2, and there is no need to apply the activator on site before welding.

[0069] The active agent layer is composed of the card edges 3 arranged on both sides of the lower base layer 1 and the upper base layer 2 close to each other, and the corresponding card edges 3 are butted against each other, and a cavity 31 is formed between all the card edges 3, and the active agent is filled in the cavity 31. It can be understood that the active agent is wrapped by the card edges 3 of the lower base layer 1 and the card edges 3 of the upper base layer 2, and remains in the cavity 31. Since the area in the cavity 31 is fixed, the thickness of the active agent in the cavity 31 is also fixed, that is, the thickness of the active agent is not only accurately set, but also relatively uniform.

[0070] The thickness of the active agent layer that can increase the penetration depth is 8mg / cm 2 , width is 20cm.

[0071] The lower base layer 1 and the upper base layer 2 are both made of industrial waterproof masking paper, 0.12 mm thick and 25 cm wide, and the adhesive strip 4 is made of high temperature resistant hot melt pressure sensitive adhesive, 2 cm wide.

[0072] The organic solvent is acetone.

[0073] Example 3: An activator capable of increasing welding penetration and a method for preparing an activator welding strip thereof. The difference from Example 2 is that:

[0074] The activator powder capable of increasing the depth of welding melting comprises the following components in percentage by weight: B 2 O 3 Powder: 38%; TiO 2 Powder: 36%; MoSi 2 Powder: 9%; SiO 2 Powder: 5%; Cr 2 O 3 Powder: 5%; NiO powder: 6%; Nb+V microalloy powder: 1%.

[0075] The purity and particle size of the active agent powder are selected according to the following levels, among which: B 2 O 3 Purity above 98%, particle size 50μm≤≤75μm; TiO 2 Purity above 99%, particle size 67μm≤≤100μm; MoSi2 Purity above 99.8%, particle size 50μm≤≤74μm; SiO 2 Purity above 98.5%, particle size 96μm≤≤275μm; Cr 2 O 3 Purity is above 99%, particle size is 80μm≤≤115μm; NiO purity is above 99%, particle size is 45μm≤≤74μm; Nb+V purity is above 99.5%, particle size is 74μm≤≤96μm.

[0076] The active agent powder capable of increasing the melting depth is mixed and ground for 20 minutes, and then screened and configured according to the following particle sizes: 48 μm≤particle size≤62 μm, 90 wt%; 62 μm<particle size<109 μm, 5 wt%; 38≤particle size<48 μm, 5 wt%.

[0077] The active agent powder capable of increasing the melting depth and the organic diluent are prepared in a content ratio of 100g:60ml.

[0078] The organic diluent is prepared by mixing a liquid organic solvent and a binder in a ratio of 4:1. The binder is a high-quality sodium silicate standard solution, model: Liquid-2, containing components of SiO 2 Mole number and NaO 2 The molar ratio is 3.4.

[0079] Application Example 1:

[0080] Cleaning before welding: Select two Q235B carbon steel test plates with specifications of 300×width 120×thickness 10㎜ as the application objects, adopt I-type butt joint, clean the rust and dirt within 30㎜ on the front and back sides of the weld, and fix the arc starting plate after cleaning with acetone.

[0081] Application of the active tape: Cut 300 mm of the active agent welding tape obtained in Example 1, press it onto the weld surface of the test plate along the center direction of the weld with the adhesive strip 4, tear off the isolation layer 5, let it stand in the air for 8-10 minutes, and after the organic solvent evaporates through the air vents 11, use automatic tungsten inert gas welding for welding.

[0082] Process parameter settings: welding current 178A, welding speed 40mm / min, welding arc length 3.0㎜, welding argon 15L / min, tungsten electrode diameter 3.2. After welding, the mechanical properties of the test plate welds were tested according to the requirements of NB / T47016 "Mechanical Properties Test of Welding Specimens for Pressure Equipment Products", see Table 1 for details.

[0083] Application Example 2:

[0084] Cleaning before welding: Select two Q345R test plates with specifications of 300×width 120×thickness 10㎜ as the application objects, adopt I-type butt joint, clean the rust and dirt within 30㎜ on the front and back sides of the weld, and fix the arc starting plate after cleaning with acetone.

[0085] Application of the active tape: Cut 300 mm of the active agent welding tape obtained in Example 2, press it onto the weld surface of the test plate along the center direction of the weld with the adhesive strip 4, tear off the isolation layer 5, let it stand in the air for 10-12 minutes, and after the organic solvent evaporates through the air vents 11, use automatic tungsten inert gas welding for welding.

[0086] Process parameter settings: welding current 183A, welding speed 36mm / min, welding arc length 3.2mm, welding argon 15L / min, tungsten electrode diameter 3.2. After welding, the mechanical properties of the test plate welds were tested according to the requirements of NB / T47016 "Mechanical Properties Test of Welding Specimens for Pressure Equipment Products", see Table 1 for details.

[0087] Application Example 3:

[0088] Cleaning before welding: Select two 304 stainless steel test plates with specifications of length 300×width 120×thickness 10㎜ as the application objects, use I-type butt joints, clean the rust and dirt within 30㎜ on the front and back sides of the weld, and fix the arc-starting plate after cleaning with acetone.

[0089] Application of active tape: Cut 300mm of the active agent welding tape obtained in Example 3, press and apply it to the surface of the weld of the test plate along the center direction of the weld with the adhesive strip 4, tear off the isolation layer 5, let it stand in the air for 10-12 minutes, and after the organic solvent evaporates through the air vent 11, use automatic tungsten inert gas argon arc welding for welding. Process parameter settings: welding current 168A, welding speed 48mm / min, welding arc length 2.8mm, welding argon gas 15L / min, tungsten electrode diameter 3.2. After welding, the mechanical properties of the test plate weld were tested according to the requirements of NB / T47016 "Mechanical Properties Test of Welded Specimens of Pressure Equipment Products", see Table 1 for details.

[0090] Comparative Example 1

[0091] TIG welding was performed under the same technical parameters as in Application Example 1 without using any activating agent, and the weld penetration and weld width were tested.

[0092] Comparative Example 2

[0093] TIG welding was performed under the same technical parameters as in Application Example 2 without using any activating agent, and the weld penetration and weld width were tested.

[0094] Comparative Example 3

[0095] TIG welding was performed under the same technical parameters as in Application Example 3 without using any activating agent, and the weld was tested for penetration depth and width.

[0096] Table 1 Test penetration data

[0097]

[0098] As shown in Table 1, after welding experiments were carried out using the active flux welding strip provided by the present technology through corresponding examples 1-3 and comparative examples 1-3, the welding machine joints were tested and compared by means of mechanical properties, intergranular corrosion and macroscopic metallography. The final results show that the active flux welding strip provided by the present solution has the excellent effect of increasing the welding penetration and ensuring stable welding quality compared with the prior art.

[0099] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and details may be made without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A method for preparing an activator welding strip capable of increasing welding penetration, characterized in that: include: S1. Preparation of active agent powder: The active agent includes a mixed active agent powder and an organic diluent, and the mixed active agent powder and the organic diluent are prepared in a ratio of 100g:40-60ml; The mixed active agent powder includes the following components in mass fraction ratio: SiO2 powder: 3%-5%, TiO2 powder: 36%-38%, B2O3 powder: 32%-38%, MoSi2 powder: 9%-16%, Cr2O3 powder: 3%-5%, NiO powder: 4%-6%, Nb+V microalloy powder: 1%-5%; The organic diluent comprises a binder and an organic solvent, and the content ratio of the organic solvent to the binder is 4:1; The binder includes a sodium silicate standard solution, the model of the sodium silicate standard solution is liquid-2, and the ratio of the molar number of SiO2 to the molar number of NaO2 in the sodium silicate standard solution is 3.1-3.4; The organic solvent includes one of alcohol, anhydrous ethanol or acetone; The purity of the B2O3 powder is greater than 98%, and the particle size is 45μm≤≤80μm; the purity of the TiO2 powder is greater than 99%, and the particle size is 62μm≤≤106μm; the purity of the MoSi2 powder is greater than 99.8%, and the particle size is 45μm≤≤74μm; the purity of the SiO2 is greater than 98.5%, and the particle size is 96μm≤≤325μm; the purity of the Cr2O3 is greater than 99%, and the particle size is 74μm≤≤125μm; the purity of the NiO powder is greater than 99%, and the particle size is ≤74μm; the purity of the Nb+V microalloy powder is greater than 99.5%, and the particle size is 74μm≤≤105μm; Wherein, after mixing and grinding, the mixed active agent powder is sampled and screened according to the following particle sizes: 48 μm≤particle size≤62 μm, 80-90 wt%; 62 μm<particle size<109 μm, 5-19 wt%; 38≤particle size<48 μm, 1-5 wt%; S2. Preparation of activator welding strip: Fill the prepared active agent into the welding tape, seal it and store it in rolls; The welding strip comprises a lower base layer (1), an active agent layer, an upper base layer (2), an adhesive layer and an isolation layer (5) which are arranged in sequence from bottom to top, the isolation layer (5) being peelable from the adhesive layer, the active agent layer comprising card edges (3) arranged on both sides of a side where the lower base layer (1) and the paper upper base layer (2) are close to each other, the corresponding card edges (3) are butted against each other, and a cavity (31) is formed between all the card edges (3), and the active agent is filled in the cavity (31).

2. The method according to claim 1, characterized in that: The lower base layer (1) is provided with a plurality of air holes (11) which are in communication with the active agent layer, and the diameter of the air holes (11) is less than 25 μm.

3. The method according to claim 1, characterized in that The thickness of the active agent layer is 4-10 mg / cm 2 , with a width of 13-20 cm evenly distributed in the cavity (31).

4. The method according to claim 1, characterized in that: The adhesive layer comprises two adhesive strips (4), and the two adhesive strips (4) are connected to two sides of the upper base layer (2).

5. The method according to claim 4, characterized in that The lower base layer (1) and the upper base layer (2) are both made of industrial waterproof masking paper, with a thickness of 0.1-0.12 mm and a width of 25 cm. The adhesive strip (4) is made of high temperature resistant hot melt pressure sensitive adhesive, with a width of 2-2.5 cm. The isolation layer (5) is polypropylene, with a thickness of 0.2-0.3 mm and a width of 25 cm.

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