Closed film forming method for flux cored wire, seamless flux cored wire and preparation device thereof, and application of preparation device

Abstract

The application provides a closed film forming method of a slotted flux-cored wire, a seamless flux-cored wire and a preparation device thereof and application of the preparation device, and belongs to the technical field of flux-cored wire preparation.The closed film forming method of the slotted flux-cored wire provided by the application comprises the following steps: after the slotted flux-cored wire is infiltrated with RK-305 weldable closed rust-proof oil and dried, a kind of seamless flux-cored wire is obtained; the RK-305 weldable closed rust-proof oil comprises rust inhibitor TVCI-115-8%, closed film forming agent TVCI-103-8%, penetrant 2-5% and volatile solvent 79-90% by mass percentage.In the application, the RK-305 weldable closed rust-proof oil can penetrate into the joint of the slotted flux-cored wire, and after drying, a hydrophobic closed rust-proof film is formed by solidification, the joint is effectively closed, the powder leakage problem of the slotted flux-cored wire is solved, and the thermal stability, moisture resistance and rust resistance are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flux-cored welding wire preparation, and in particular to a closed film-forming method for a seamless flux-cored welding wire, a seamless flux-cored welding wire, a preparation device thereof, and an application of the preparation device. Background Art

[0002] As the fourth generation welding material, flux-cored wire has a series of advantages, such as good welding quality, high production efficiency, and low overall welding cost. Therefore, its application has been rapidly promoted both at home and abroad in recent years.

[0003] Flux-cored welding wire can be categorized by structural type into two main types: seamless and seamed. Seamless flux-cored wire is manufactured primarily through the steel pipe method and in-line welding. These processes are complex, require significant equipment investment, and are expensive. While the flux powder does not absorb moisture after welding, its rust-proofing effectiveness is poor, requiring a separate anti-rust treatment (such as copper plating). Seamed flux-cored wire offers a simpler manufacturing process, requires less equipment investment, is less expensive, and is therefore more widely used.

[0004] There are two types of joints for seamed flux-cored welding wire: butt joints and lap joints. The butt joint has a gap of about 0.02mm due to the rebound during diameter reduction, while the lap joint has a very small gap, which can improve the moisture-proof ability to a certain extent. However, powder leakage is prone to occur at the butt joint and lap joint, which directly affects the quality of the welding wire during submerged arc welding. Therefore, it is urgent to solve the problem of powder leakage in seamed flux-cored welding wire. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a closed film-forming method for a seamless flux-cored welding wire, a seamless flux-cored welding wire and a preparation device thereof, and an application of the preparation device. The closed film-forming method provided by the present invention solves the powder leakage problem of a seamless flux-cored welding wire, and the obtained quasi-seamless flux-cored welding wire has good moisture-proof and rust-proof properties.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a closed film forming method for a seamed flux-cored welding wire, comprising the following steps:

[0008] The seamless flux-cored welding wire is soaked in RK-305 weldable closed anti-rust oil and then dried to obtain a quasi-seamless flux-cored welding wire;

[0009] Calculated by mass percentage, the RK-305 weldable closed anti-rust oil comprises 5-8% of rust inhibitor TVCI-11, 3-8% of closed film-forming agent TVCI-10, 2-5% of penetrant and 79-90% of volatile solvent.

[0010] Preferably, the penetrant includes one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, isooctyl ether phosphate, fatty alcohol polyoxyalkyl ether and polyoxyethylene ether compounds.

[0011] Preferably, the volatile solvent includes one or more of hexane, octane, cyclohexane, isopropyl alcohol, propylene oxide, ethyl acetate, propyl acetate, ethylene glycol monoethyl ether and ethylene glycol monobutyl ether.

[0012] Preferably, the infiltration method is to place the seamed flux-cored welding wire in RK-305 weldable closed anti-rust oil and draw it, and the drawing speed is 5 to 15 m / s.

[0013] Preferably, the drying temperature is room temperature and the drying time is ≤10s.

[0014] The present invention provides a quasi-seamless flux-cored welding wire obtained by the closed film-forming method described in the above technical solution, comprising a seamless flux-cored welding wire and a hydrophobic closed anti-rust film located at the seam and surface of the seamless flux-cored welding wire;

[0015] The hydrophobic closed anti-rust film comprises a rust inhibitor TVCI-11, a closed film-forming agent TVCI-10 and a penetrant; the mass ratio of the rust inhibitor TVCI-11, the closed film-forming agent TVCI-10 and the penetrant is (5-8): (3-8): (2-5).

[0016] The present invention provides a preparation device for a quasi-seamless flux-cored welding wire, comprising a housing 1, wherein an anti-rust oil tank 2 is provided in the housing 1;

[0017] The opposite sides of the shell are provided with a first opening 1-1 and a second opening 1-2, and the opposite sides of the anti-rust oil tank 2 are provided with a third opening 2-1 and a fourth opening 2-2. The first opening 1-1, the second opening 1-2, the third opening 2-1 and the fourth opening 2-2 are located on the same horizontal plane, and the apertures of the first opening 1-1, the second opening 1-2, the third opening 2-1 and the fourth opening 2-2 are not less than the diameter of the seamed flux-cored welding wire.

[0018] Preferably, a circulating liquid tank 3 is further provided in the shell 1; the circulating liquid tank 3 is located vertically below the anti-rust oil tank 2; the anti-rust oil tank 2 and the circulating liquid tank 3 are connected in a circular manner through a pipeline, and a circulating pump is provided on the pipeline.

[0019] Preferably, a volatile gas receiver 5 and a condenser 6 are further provided in the housing 1;

[0020] The volatile gas receiver 5 is located inside the condenser 6;

[0021] The condenser 6 is located vertically above the anti-rust oil tank 2; the condenser 6 is connected to the circulating liquid tank 3 through a third pipe.

[0022] The present invention also provides the application of the preparation device of the seamless flux-cored welding wire described in the above technical solution in the preparation of seam welding wire, the rust prevention treatment after the production of seamless flux-cored welding wire, or the rust prevention treatment in the metal drawing process.

[0023] The invention provides a sealing film-forming method for a seamless flux-cored welding wire, comprising the following steps: impregnating the seamless flux-cored welding wire with RK-305 weldable sealed rust-proof oil and then drying the welded flux-cored welding wire to obtain a quasi-seamless flux-cored welding wire; wherein the RK-305 weldable sealed rust-proof oil comprises, by weight percentage, 5-8% of a rust inhibitor TVCI-11, 3-8% of a sealed film-forming agent TVCI-10, 2-5% of a penetrant, and 79-90% of a volatile solvent. In the present invention, RK-305 weldable closed rust-proof oil can penetrate the seams of seamed flux-cored welding wire. After drying, the volatile solvent is completely evaporated, and the penetrant, closed film-forming agent TVCI-10, and rust inhibitor TVCI-11 quickly solidify to form a hydrophobic closed rust-proof film. This effectively seals the seams of the seamed flux-cored welding wire, solving the problem of powder leakage in the seamed flux-cored welding wire and preventing moisture from entering the flux-cored welding wire. This improves the thermal stability, moisture resistance, and rust resistance of the seamed flux-cored welding wire, eliminating the need for separate rust-proofing treatment. The resulting quasi-seamless flux-cored welding wire has the properties of seamless flux-cored welding wire (no powder leakage and no moisture absorption). Furthermore, the surface of the flux-cored welding wire treated with RK-305 weldable closed rust-proof oil is lubricated, facilitating coiling or winding of the flux-cored welding wire. The closed film-forming method provided by the present invention is simple and suitable for industrial production.

[0024] The present invention provides a quasi-seamless flux-cored welding wire obtained by the closed film-forming method described in the above technical solution, comprising a seamless flux-cored welding wire and a hydrophobic closed anti-rust film located at the seams and surface of the seamless flux-cored welding wire; the hydrophobic closed anti-rust film comprises a rust inhibitor TVCI-11, a closed film-forming agent TVCI-10, and a penetrant; the mass ratio of the rust inhibitor TVCI-11, the closed film-forming agent TVCI-10, and the penetrant is (5-8):(3-8):(2-5). In the present invention, the hydrophobic closed anti-rust film can prevent powder leakage from the seamless flux-cored welding wire and has good thermal stability, moisture resistance, and rust resistance. During the welding process of the quasi-seamless flux-cored welding wire, the closed film-forming agent TVCI-10, the rust inhibitor TVCI-11, and the penetrant cooperate with each other to quickly form a closed layer, which dissolves along with the flux core when heated and does not affect the welding effect.

[0025] The present invention provides a preparation device for a quasi-seamless flux-cored welding wire, comprising a shell 1, wherein an anti-rust oil tank 2 is provided in the shell 1; a first opening 1-1 and a second opening 1-2 are provided on opposite sides of the shell, and a third opening 2-1 and a fourth opening 2-2 are provided on opposite sides of the anti-rust oil tank 2, wherein the first opening 1-1, the second opening 1-2, the third opening 2-1 and the fourth opening 2-2 are located on the same horizontal plane; and the apertures of the first opening 1-1, the second opening 1-2, the third opening 2-1 and the fourth opening 2-2 are not less than the diameter of the seamless flux-cored welding wire. After the seamed flux-cored welding wire passes through the anti-rust oil tank 2 containing RK-305 weldable closed rust-proof oil, the surface of the seamed flux-cored welding wire is coated with the RK-305 weldable closed rust-proof oil. The volatile solvent in the RK-305 weldable closed rust-proof oil quickly evaporates, and the remaining components solidify at the seams and outer surface of the seamed flux-cored welding wire, forming a hydrophobic closed rust-proof film, thereby preventing powder leakage from the seamed flux-cored welding wire and improving the thermal stability, moisture resistance, and rust resistance of the seamed flux-cored welding wire. Moreover, the device provided by the present invention has a simple structure and can be used for the independent industrial production of seamless flux-cored welding wire. It can also be used for the preparation of seamed welding wire, the rust-proof treatment of seamless flux-cored welding wire after production, and the rust-proof treatment during metal drawing processes.

[0026] Furthermore, the circulating liquid tank 3, the volatile gas receiver 5 and the condenser 6 can improve the recycling rate of the RK-305 weldable closed anti-rust oil and realize the continuous production of the quasi-seamless flux-cored welding wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a device for preparing a quasi-seamless flux-cored welding wire according to the present invention, wherein 1 is a housing, 1-1 is a first opening, 1-2 is a second opening, 2 is an anti-rust oil tank, 2-1 is a third opening, 2-2 is a fourth opening, 3 is a circulating liquid tank, 4-1 is a first circulating pump, 4-2 is a second circulating pump, 5 is a volatile gas receiver, and 6 is a condenser;

[0028] Figure 2 This is an electron microscope image of the planed surface of the seamed flux-cored welding wire in Example 1;

[0029] Figure 3 This is an electron microscope image of the planed surface of the quasi-seamless flux-cored welding wire prepared in Example 1. DETAILED DESCRIPTION

[0030] The present invention provides a method for forming a closed film of a seamed flux-cored welding wire, comprising the following steps:

[0031] The seamless flux-cored welding wire is soaked in RK-305 weldable closed rust-proof oil and then dried to obtain a quasi-seamless flux-cored welding wire;

[0032] Calculated by mass percentage, the RK-305 weldable closed anti-rust oil comprises 5-8% of rust inhibitor TVCI-11, 3-8% of closed film-forming agent TVCI-10, 2-5% of penetrant and 79-90% of volatile solvent.

[0033] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0034] In terms of mass percentage, the RK-305 weldable sealed anti-rust oil includes 5-8%, preferably 5.5-7.5%, more preferably 6-7%, and most preferably 6.5% of the anti-rust agent TVCI-11. In the present invention, the anti-rust agent TVCI-11 is preferably purchased from Tianjin Weisai Technology Development Co., Ltd.

[0035] In the present invention, the rust inhibitor TVCI-11 can improve the rust resistance of seamed flux-cored welding wire and exhibit excellent water mist erosion resistance. The RK-305 weldable sealed rust preventive oil includes 3-8% by weight of the sealed film-forming agent TVCI-10, preferably 3.5-7.5%, more preferably 4-7%, and most preferably 5-6%. In the present invention, the sealed film-forming agent TVCI-10 is preferably purchased from Tianjin Weisai Technology Development Co., Ltd. In the present invention, the TVCI-10 sealant exhibits excellent thermal stability and sealing properties. When used in combination with the rust inhibitor TVCI-11, it can improve the thermal stability, rust resistance, water mist erosion resistance, and moisture resistance of seamed flux-cored welding wire.

[0036] In terms of percentage by mass, the RK-305 weldable sealed rust preventive oil comprises 2-5% of a penetrant, preferably 2.5-4.5%, more preferably 3-4%, and most preferably 3.5%. In the present invention, the penetrant preferably comprises one or more of fatty alcohol polyoxyethylene ether (JFC), alkylphenol polyoxyethylene ether (JFC-1), isooctyl alcohol ether phosphate (OEP-70), fatty alcohol polyoxyalkyl ether (AEP), and polyoxyethylene ether compound (JFC-M); and the fatty alcohol polyoxyethylene ether (JFC) preferably comprises sec-octanol polyoxyethylene ether (JFC-2) or isooctyl alcohol polyoxyethylene ether (JFC-E). The present invention uses a rust inhibitor TVCI-11, a closed film-forming agent TVCI-10 and a penetrant in combination, and can form a hydrophobic closed rust-proof film on the joints and outer surface of the seamed flux-cored welding wire, thereby effectively sealing the joints of the seamed flux-cored welding wire, solving the problem of powder leakage of the seamed flux-cored welding wire, and improving the thermal stability, rust prevention performance, water mist erosion resistance and moisture resistance of the seamed flux-cored welding wire.

[0037] Measured by mass percentage, the RK-305 weldable sealed rust preventive oil comprises 79-90% of a volatile solvent, preferably 80-88%, more preferably 82-86%, and most preferably 84-85%. In the present invention, the volatile solvent preferably comprises one or more of hexane, octane, cyclohexane, isopropyl alcohol, propylene oxide, ethyl acetate, propyl acetate, ethylene glycol monoethyl ether, and ethylene glycol monobutyl ether. By adding a solvent to RK-305 weldable closed rust-proof oil, the various components in the RK-305 weldable closed rust-proof oil can be fully dispersed and mixed. After the seamed flux-cored welding wire is soaked in the RK-305 weldable closed rust-proof oil, the volatile solvent is completely evaporated, and the closed film-forming agent TVCI-10, the rust inhibitor TVCI-11 and the penetrant cooperate with each other to quickly form a hydrophobic closed rust-proof film, effectively sealing the seams of the seamed flux-cored welding wire, solving the problem of powder leakage in the seamed flux-cored welding wire, and improving its thermal stability, rust prevention performance, water mist erosion resistance and moisture resistance.

[0038] The present invention does not specifically limit the source of the seamed flux-cored welding wire; any commercially available seamed flux-cored welding wire known to those skilled in the art can be used. In the embodiments of the present invention, the seamed flux-cored welding wire is preferably purchased from Tianjin Jingcheng Weiye Machinery Manufacturing Co., Ltd. In the present invention, the infiltration method is preferably to draw the seamed flux-cored welding wire in RK-305 weldable enclosed rust-proof oil. The drawing speed is preferably 5 to 15 m / s, and most preferably 10 m / s.

[0039] In the present invention, the drying method is preferably natural volatilization, the drying temperature is preferably room temperature, and the drying time is preferably ≤10 seconds, more preferably 1 to 10 seconds, and even more preferably 5 to 8 seconds. In the present invention, during the drying process, the volatile solvent in the RK-305 weldable closed rust preventive oil is completely evaporated, and the rust inhibitor TVCI-11, closed film-forming agent TVCI-10, and penetrant are cured to form a hydrophobic closed rust preventive film.

[0040] The present invention provides a quasi-seamless flux-cored welding wire obtained by the closed film-forming method described in the above technical solution, comprising a seamless flux-cored welding wire and a hydrophobic closed anti-rust film located at the seam and surface of the seamless flux-cored welding wire; the hydrophobic closed anti-rust film comprises a rust inhibitor TVCI-11, a closed film-forming agent TVCI-10, and a penetrant. In the present invention, the mass ratio of the rust inhibitor TVCI-11, the closed film-forming agent TVCI-10, and the penetrant is (5-8):(3-8):(2-5), preferably (5.5-7.5):(3.5-7.5):(2.5-4.5), more preferably (6-7):(4-7):(3-4), and most preferably (6.5-7):(5-6):(3.5-4). In the present invention, the thickness of the hydrophobic closed anti-rust film is preferably 0.5-1 μm, more preferably 0.6-0.8 μm.

[0041] In the quasi-seamless flux-cored welding wire provided by the present invention, the hydrophobic closed anti-rust film effectively seals the seamless flux-cored welding wire to prevent powder leakage from the seamless flux-cored welding wire. Moreover, the wire has excellent moisture-proof, rust-proof and thermal stability properties.

[0042] The present invention provides a device for preparing a quasi-seamless flux-cored welding wire, comprising a housing 1, within which is disposed an anti-rust oil tank 2. In the present invention, a first opening 1-1 and a second opening 1-2 are disposed on opposing sides of the housing, and a third opening 2-1 and a fourth opening 2-2 are disposed on opposing sides of the anti-rust oil tank 2. The first opening 1-1, the second opening 1-2, the third opening 2-1, and the fourth opening 2-2 are located on the same horizontal plane, and the dimensions of the first opening 1-1, the second opening 1-2, the third opening 2-1, and the fourth opening 2-2 are no less than the diameter of the seamless flux-cored welding wire. In the present invention, the seamless flux-cored welding wire passes sequentially through the first opening 1-1, the third opening 2-1, the fourth opening 2-2, and the second opening 1-2.

[0043] In an embodiment of the present invention, a circulating liquid tank 3 is preferably further provided in the housing 1; the circulating liquid tank 3 is located vertically below the rust-proof oil tank 2; the rust-proof oil tank 2 and the circulating liquid tank 3 are connected by a pipeline, and a circulating pump is provided on the pipeline. In an embodiment of the present invention, the rust-proof oil tank 2 and the circulating liquid tank 3 are connected by a first pipeline and a second pipeline, the first pipeline is provided with a first circulating pump 4-1, and the second pipeline is provided with a second circulating pump 4-2; the first circulating pump 4-1 and the second circulating pump 4-2 are used to transport the enclosed rust-proof oil in the circulating liquid tank 3 to the rust-proof oil tank 2. In an embodiment of the present invention, the first circulating pump 4-1 and the second circulating pump 4-2 are preferably provided with adjustable circulation volume rotary valves to achieve adjustable circulation speed.

[0044] In an embodiment of the present invention, the housing 1 is preferably further provided with a volatile gas receiver 5 and a condenser 6. The volatile gas receiver 5 is located within the condenser 6, which is located vertically above the rust-proof oil tank 2. The condenser 6 is connected to the circulating liquid tank 3 via a pipeline. In an embodiment of the present invention, the condenser is preferably a circulating water condenser. In the present invention, volatile solvent gases emanating from the rust-proof oil tank 2 and the circulating liquid tank 3 are collected by the volatile gas receiver 5 and then enter the condenser 6 for condensation and recycling before being returned to the circulating liquid tank 3. This prevents rapid volatilization of the volatile solvent in the RK-305 weldable sealed rust-proof oil in the rust-proof oil tank 2, ensures relatively constant concentrations of the rust inhibitor TVCI-115-8%, the sealed film-forming agent TVCI-103-8%, and the penetrant, and prevents the RK-305 weldable sealed rust-proof oil from becoming viscous and affecting its effectiveness, thereby enabling continuous production of sealed film-forming seamed flux-cored welding wire.

[0045] In the embodiment of the present invention, since the drawing speed of the welding wire is very fast, the RK-305 weldable closed rust-proof oil is coated on the surface of the seamed flux-cored welding wire. After passing through the second opening 1-2, the volatile solvent in the RK-305 weldable closed rust-proof oil evaporates into the atmosphere, and the penetrant, closed film-forming agent TVCI-10 and rust inhibitor TVCI-11 quickly solidify to form a hydrophobic closed rust-proof film, which effectively seals the joints of the seamed flux-cored welding wire.

[0046] The present invention also provides the use of the device described in the above technical solution for rust prevention in the preparation of seamed welding wire, post-production rust prevention of seamless flux-cored welding wire, or rust prevention during metal drawing. In the present invention, when the device is used for rust prevention in the preparation of seamed welding wire or post-production rust prevention of seamless flux-cored welding wire, the device is preferably installed before the wire take-up unit in the welding wire preparation equipment.

[0047] The following combination Figure 1 A method for preparing a quasi-seamless flux-cored welding wire using a quasi-seamless flux-cored welding wire preparation device is described as follows:

[0048] The seamless flux-cored welding wire is drawn so as to pass through the first opening 1-1, the third opening 2-1, the anti-rust oil tank 2 containing RK-305 weldable closed rust-proof oil, the fourth opening 2-2 and the second opening 1-2 in sequence, and then dried to obtain a quasi-seamless flux-cored welding wire, wherein the RK-305 weldable closed rust-proof oil overflowing from the third opening 2-1 and the fourth opening 2-2 of the anti-rust oil tank 2 flows into the circulating liquid tank 3, and the gas formed by the volatilization of the volatile solvent in the anti-rust oil tank 2 and the circulating liquid tank 3 is collected by the volatile gas receiver 5 and then introduced into the condenser 6 for condensation to form a liquid, and the liquid flows back to the circulating liquid tank 3 through the pipeline, and the liquid in the circulating liquid tank 3 is pumped into the anti-rust oil tank 2 by the first circulating pump 4-1 and the second circulating pump 4-2.

[0049] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] Example 1

[0051] The composition of RK-305 weldable closed anti-rust oil is as follows, by mass percentage: rust inhibitor TVCI-11 7%, closed film-forming agent TVCI-10 6%, penetrant JFC-2 4% and propylene oxide 82%; the seamed flux-cored welding wire was purchased from Tianjin Jingcheng Weiye Machinery Manufacturing Co., Ltd.

[0052] The seamless flux-cored welding wire was drawn at a speed of 5 m / s, sequentially passing through the first opening 1-1, the third opening 2-1, the anti-rust oil tank 2 containing RK-305 weldable closed anti-rust oil, the fourth opening 2-2, and the second opening 1-2, and then dried at room temperature for 10 seconds to obtain a quasi-seamless flux-cored welding wire.

[0053] Among them, the RK-305 weldable closed rust-proof oil overflowing from the third opening 2-1 and the fourth opening 2-2 of the rust-proof oil tank 2 flows into the circulating liquid tank 3, and the volatile solvent gas volatilized from the rust-proof oil tank 2 and the circulating liquid tank 3 is collected by the volatile gas receiver 5 and then introduced into the circulating water condenser 6 to condense into liquid, and the liquid flows back to the circulating liquid tank 3 through the pipeline, and the liquid in the circulating liquid tank 3 is pumped into the rust-proof oil tank 2 through the first circulating pump 4-1 and the second circulating pump 4-2.

[0054] The electron microscope image of the planed surface of the seamed flux-cored welding wire used in this embodiment is as follows: Figure 2 As shown, the scale is 500μm; the electron microscope image of the prepared quasi-seamless flux-cored welding wire is as follows Figure 3 As shown, the scale bar is 500μm. Figures 2-3It can be seen that the method provided by the present invention can achieve effective sealing of the seamed flux-cored welding wire.

[0055] Example 2

[0056] A quasi-seamless flux-cored welding wire was prepared according to the method of Example 1. The difference from Example 1 is that the passing speed of the seamless flux-cored welding wire is 10 m / s.

[0057] Example 3

[0058] A quasi-seamless flux-cored welding wire was prepared according to the method of Example 1. The difference from Example 1 is that the passing speed of the seamless flux-cored welding wire is 15 m / s.

[0059] Test Case

[0060] (1) Test of the consumption (g / m) of RK-305 weldable closed anti-rust oil: The front and back weighing difference method was used for detection. Three seamless flux-cored welding wires were taken, and the length of each quasi-seamless flux-cored welding wire was 1 meter. Three portions of RK-305 weldable closed anti-rust oil with a mass of 100 g (m0) were accurately weighed and placed in sealed plastic cups respectively. The seamless flux-cored welding wires passed through the three sealed plastic cups containing RK-305 weldable closed anti-rust oil at speeds of 5 m / s, 10 m / s and 15 m / s (corresponding to Example 1, Example 2 and Example 3, respectively). Then, the mass (m1) of the remaining RK-305 weldable closed anti-rust oil in the sealed beaker was weighed respectively. The consumption (g / m) of RK-305 weldable closed anti-rust oil = (m1-m0) / 1m. The test results are shown in Table 1.

[0061] (2) Test on the recovery ratio of RK-305 weldable closed anti-rust oil: The front-to-back differential weight weighing method was adopted to prepare quasi-seamless flux-cored welding wire according to the method of Example 1, wherein the mass of RK-305 weldable closed anti-rust oil was 50 kg (M0), and the passing speeds of the seamless flux-cored welding wire were 5 m / s, 10 m / s and 15 m / s (corresponding to Example 1, Example 2 and Example 3, respectively). After the quasi-seamless flux-cored welding wire was prepared for 24 hours, the remaining RK The mass of RK-305 weldable sealed anti-rust oil is M1, and the loss mass M2 of the seamed flux-cored welding wire for RK-305 weldable sealed anti-rust oil is calculated. The evaporation amount of RK-305 weldable sealed anti-rust oil is M3 = M0-M1-M2. The mass of RK-305 weldable sealed anti-rust oil recovered in the condenser is weighed as M4, and the recovery rate of RK-305 weldable sealed anti-rust oil = M4 / M3×100%. The results are shown in Table 1.

[0062] (3) Hydrophobic closed anti-rust film thickness test: direct observation by electron microscope was used, and the results are shown in Table 1.

[0063] (4) Drop test: Direct observation method was used to drop the quasi-seamless flux-cored welding wires prepared in Examples 1 to 3 at a height of 30 cm from the ground to observe whether there was powder leakage. The results are shown in Table 1.

[0064] (5) Anti-rust performance test: The quasi-seamless flux-cored welding wires prepared in Examples 1 to 3 were placed in a high-temperature, high-humidity, and high-temperature box at a temperature of 50°C and a humidity of 100% to observe their rusting conditions. The results are shown in Table 1.

[0065] (6) Welding performance test: The rod core welding effect test of the oil casing was carried out in accordance with the methods of GB6417.1-2005 ISO6520.1-1998 Metal fusion welded joints — Classification and description of defects, ISO 5817-2003 Welding. Quality classification of defects in steel, nickel, titanium and their alloys fusion welded joints (excluding beam welds) and DIN EN 10042-2006 ISO10042-2005 Welding - Aluminum and its alloys arc welded joints - Defect evaluation group. The results are shown in Table 1.

[0066] Table 1 Performance test results of seamless flux-cored welding wire and quasi-seamless flux-cored welding wire prepared in Examples 1 to 3

[0067]

[0068] In Table 1, “—” indicates that there is no test data.

[0069] As shown in Table 1, the quasi-seamless flux-cored welding wire prepared by the present invention has a permeability of up to 0.1 m / s, can directly reach the micron-level gaps of the seamless flux-cored welding wire, and no powder leakage is observed after falling 30 cm from the ground. The recovery rate of RK-305 weldable closed rust-proof oil is over 85%, indicating that the quasi-seamless flux-cored welding wire provided by the present invention does not leak powder, has good rust prevention performance, and has a high recycling rate of RK-305 weldable closed rust-proof oil.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A closed film forming method for a seamed flux-cored welding wire, characterized in that: The following steps are involved: The seamless flux-cored welding wire is soaked in RK-305 weldable closed anti-rust oil and then dried to obtain a quasi-seamless flux-cored welding wire; Calculated by mass percentage, the RK-305 weldable closed anti-rust oil includes rust inhibitor TVCI-11 5-8%, closed film-forming agent TVCI-10 3-8%, penetrant 2-5% and volatile solvent 79-90%; The infiltration method is to place the seamed flux-cored welding wire in RK-305 weldable closed anti-rust oil and draw it, and the drawing speed is 5-15m / s; The drying temperature is room temperature and the drying time is ≤10s.

2. The closed film forming method according to claim 1, characterized in that: The penetrant includes one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, isooctyl ether phosphate, fatty alcohol polyoxyalkyl ether and polyoxyethylene ether compounds.

3. The closed film forming method according to claim 1, characterized in that: The volatile solvent includes one or more of hexane, octane, cyclohexane, isopropyl alcohol, propylene oxide, ethyl acetate, propyl acetate, ethylene glycol monoethyl ether and ethylene glycol monobutyl ether.

4. The closed film forming method according to any one of claims 1 to 3, characterized in that: The preparation device of the quasi-seamless flux-cored welding wire used in the closed film forming method comprises a shell (1), wherein an anti-rust oil tank (2) is provided in the shell (1); The opposite side surfaces of the shell are provided with a first opening (1-1) and a second opening (1-2), and the opposite side surfaces of the rust-proof oil tank (2) are provided with a third opening (2-1) and a fourth opening (2-2), the first opening (1-1), the second opening (1-2), the third opening (2-1) and the fourth opening (2-2) are located on the same horizontal plane, and the apertures of the first opening (1-1), the second opening (1-2), the third opening (2-1) and the fourth opening (2-2) are not less than the diameter of the seamed flux-cored welding wire.

5. The closed film forming method according to claim 4, characterized in that: A circulating liquid tank (3) is further provided in the housing (1); the circulating liquid tank (3) is located vertically below the anti-rust oil tank (2); the anti-rust oil tank (2) and the circulating liquid tank (3) are circulated and connected via a pipeline, and a circulating pump is provided on the pipeline.

6. The closed film forming method according to claim 5, characterized in that: A volatile gas receiver (5) and a condenser (6) are also provided in the housing (1); The volatile gas receiver (5) is located inside the condenser (6); The condenser (6) is located vertically above the anti-rust oil tank (2); the condenser (6) is connected to the circulating liquid tank (3) through a third pipe.

7. The quasi-seamless flux-cored welding wire obtained by the closed film forming method according to any one of claims 1 to 6, characterized in that: The invention comprises a seamed flux-cored welding wire and a hydrophobic closed anti-rust film located at the seam and surface of the seamed flux-cored welding wire; The hydrophobic closed anti-rust film comprises a rust inhibitor TVCI-11, a closed film-forming agent TVCI-10, and a penetrant; the mass ratio of the rust inhibitor TVCI-11, the closed film-forming agent TVCI-10, and the penetrant is (5-8): (3-8): (2-5).

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