High weldability flux cored solid wire and its production method and application

Abstract

The application relates to the technical field of welding materials, and discloses a gas shielded solid welding wire with high weldability and a production method and application thereof. The application reduces the polymerization degree of a welding slag glass network and the viscosity of the welding slag by controlling the Si, Mn and Ti contents; meanwhile, the surface tension of a molten pool is reduced by controlling the S content, so that the arc force received by the molten pool and the arc force are balanced, the welding slag is gathered, and the distribution area of the welding slag is reduced. In summary, under the synergistic action of silicon, manganese, titanium and sulfur, the welding slag generated on the weld surface after welding can be easily removed, the welding slag removal time is significantly reduced, and the production efficiency is improved. In addition, by controlling the C, Si, Mn and Ti contents, a large amount of acicular ferrite is ensured to be contained in the weld, the generation of side plate ferrite and bainite is reduced, the P and S contents are controlled on this basis, cold brittleness is reduced, and hot cracks are avoided, so that the impact toughness is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding materials, in particular to a gas shielded solid welding wire with high weldability and a production method and application thereof. BACKGROUND

[0002] In the connection of household appliance compressors, automobile parts and automobile chassis parts, gas shielded welding is generally used, and slag will appear on the surface of the weld after welding. Since the slag is an insulator, the area where it is located cannot form an electrophoretic coating during electrophoretic coating. In a corrosive environment, the part without an electrophoretic coating will become the starting point of rust, resulting in a significant reduction in the service life of the part. In order to improve the electrophoretic coating state of the welded joint, the slag must be removed in advance. However, the slag generated by the current gas shielded welding wire is difficult to remove, resulting in a serious reduction in production efficiency. In addition, in order to ensure long-term welding operation without reducing welding efficiency, the welding wire needs to have excellent wire feeding stability to avoid spatter clogging the nozzle and thus interrupting welding.

[0003] The prior art discloses a 500MPa grade low slag gas shielded solid welding wire for the automobile industry, and the chemical composition of the welding wire includes, by weight percentage: C: 0.11%-0.16%, Si: 0.50%-0.70%, Mn: 1.00%-1.35%, P<0.015%, S: 0.005%-0.015%, Cr+Ni+Mo<0.15%, Cu≤0.20%, the balance being Fe and unavoidable impurities, the sum of the mass fractions of the components being 100%, the amount of slag after welding of the solid welding wire is reduced by increasing the C content in the solid welding wire during the welding process to reduce the burning loss of Mn and Si alloy elements, and the slag after changing the slag system is dispersed in the form of small particles on the surface of the weld metal, without forming a continuous sheet of slag; however, the increase in the C content cannot change the slag system of the slag, and the slag on the surface of the weld metal cannot form an electrophoretic coating, so manual slag removal is still required, and the high Si content in the welding wire results in a large viscosity of the slag, which is difficult to remove.

[0004] The related technology discloses a low-aluminum and low-slag gas shielded solid welding wire for the automobile industry, the welding wire comprises the following components in mass fraction: C: 0.06%-0.15%, Mn: 0.9%-1.50%, Si: 0.55%-0.90%, Al: 0.05%-0.15%, Cr: 0.05%-0.15%, S: 0.005%-0.025%, P≤0.025%, Ni≤0.02%, Mo≤0.02%, Cu: 0.06%-0.20%, the balance of Fe and inevitable impurities, the sum of the mass fractions of the components is 100%, the content of Al is added to the solid welding wire, the post-weld slag system is changed from the MnO-SiO2 slag system to the MnO-SiO2-Al2O3 slag system, after the slag system is changed, the slag is dispersed in the weld metal in a small size, and a continuous slag inclusion is not formed; however, the addition of the Al element in the welding wire can cause the welding spatter to be significantly increased, and the welding operation is affected.

[0005] The related technology discloses a super-low-silicon welding wire with excellent pore resistance and electrophoretic coating, which comprises the following components in percentage by weight: C: 0.001%-0.30%, Si<0.15%, Mn: 0.50%-3.00%, P<0.030%, S<0.030%, the balance of Fe and inevitable impurities, the content of Si in the welding wire is reduced, and the post-weld slag system is changed from the MnO-SiO2 slag system to the MnO slag system, but the content of Si is too low, the deoxidation effect is reduced, the number of inclusions in the weld is significantly increased, and the impact toughness is reduced.

[0006] Therefore, how to reduce the removal difficulty of the welding slag, avoid the nozzle being blocked by the spatter, improve the impact toughness of the weld, and produce the gas shielded solid welding wire with high welding performance is a technical problem to be solved in the field. SUMMARY

[0007] Therefore, the application provides a gas shielded solid welding wire with high welding performance to solve the problems of great removal difficulty of the welding slag, obvious spatter and poor impact toughness in the welding process.

[0008] In a first aspect, the application provides a gas shielded solid welding wire with high welding performance, and the chemical composition of the gas shielded solid welding wire comprises the following components in mass ratio:

[0009] C: 0.06%-0.09%, Si: 0.25%-0.45%, Mn: 1.3%-1.6%, S: 0.015%-0.035%, P≤0.015%, Ti: 0.08%-0.12%, Al≤0.008%, Ca≤0.0010%, and the balance of Fe and inevitable impurities.

[0010] In some alternative embodiments, at least one of the following conditions is satisfied: tensile strength ≥ 1200 MPa, spatter weight in nozzle < 5 g, and slag removal time ≤ 2 min.

[0011] In a second aspect, the present application provides a method for producing the high-weldability flux-cored solid wire of the first aspect, comprising the following steps:

[0012] (1) Converter smelting: molten iron and scrap steel are added to the converter for smelting, and the S content in the molten iron is 0.05%-0.07%;

[0013] (2) Refining: the refining slag basicity is 1.6-2.1, and the FeO+MnO content in the refining slag is 1.2%-1.8%;

[0014] (3) Small billet continuous casting;

[0015] (4) High-speed wire rolling: the entry temperature of the finishing rolling is 810°C-850°C, and the wire laying temperature is 820°C-850°C;

[0016] (5) Cooling: the cooling speed is 0.5°C / s-1°C / s, and the temperature out of the heat preservation cover is ≤ 550°C;

[0017] (6) Drawing: the cooled coil is obtained after peeling, drawing, and copper plating.

[0018] In some alternative embodiments, in the refining step, calcium carbide is added, and when the oxygen content is 0.0020%-0.0040%, a Ti wire is fed, and when the Ti wire is fed, the argon flow rate of bottom blowing is 30 NL / min-80 NL / min.

[0019] In some alternative embodiments, during the small billet continuous casting process, full protection casting is performed using a large ladle long nozzle and a submerged nozzle, the molten steel superheat is 35°C-50°C, the drawing speed is 2.7 m / min-2.9 m / min, the total flow rate of the secondary cooling water is 500 L / min-600 L / min, and the secondary cooling section adopts four-zone water mist cooling, and the water distribution of the first zone to the fourth zone is 30-40: 35-45: 12-20: 6-12, respectively.

[0020] In some alternative embodiments, during the high-speed wire rolling process, the soaking segment temperature is 1050°C-1100°C, the soaking segment holding time is 35 min-50 min, the roughness of the rolling groove is 0.3 μm-0.6 μm, and the rolling groove steel volume is ≤ 500 t.

[0021] In some alternative embodiments, during the controlled cooling process, the Stelmor cooling line heat preservation cover is fully closed, the coil cooling speed is 0.5°C / s-1°C / s, and the coil temperature out of the heat preservation cover is ≤ 550°C.

[0022] In some optional embodiments, the hull peeling step comprises horizontal hull peeling and vertical hull peeling.

[0023] In some optional embodiments, a sand belt polishing step is further included after the hull peeling.

[0024] In some optional embodiments, the thickness of the copper plating layer is 0.3-0.8 μm.

[0025] In some optional embodiments, in step (1), the scrap steel comprises clean scrap steel.

[0026] In some optional embodiments, the mass of the molten iron accounts for ≥78% of the total mass of the molten iron and the scrap steel.

[0027] In some optional embodiments, low-aluminum ferrosilicon and low-carbon ferromanganese are sequentially added for deoxidization and alloying at 1 / 3 tapping, the tapping temperature is 1610-1650 ℃, the Al content in the low-aluminum ferrosilicon is ≤0.05%, and the C content in the low-carbon ferromanganese is ≤0.7%.

[0028] In a third aspect, the application provides application of the high-welding gas shield solid wire prepared by the production method of the second aspect or the high-welding gas shield solid wire prepared by the production method of the first aspect in household appliance compressors and automobile parts.

[0029] Compared with the prior art, the technical scheme of the application has the following advantages:

[0030] 1. The gas shielded solid welding wire with high weldability provided by the present application has the following chemical composition: C: 0.06%-0.09%, Si: 0.25%-0.45%, Mn: 1.3%-1.6%, S: 0.015%-0.035%, P≤0.015%, Ti: 0.08%-0.12%, Al≤0.008%, Ca≤0.0010%, and the rest is Fe and inevitable impurities; by controlling the Si content to be 0.25%-0.45%, the Mn content to be 1.3%-1.6%, and the Ti content to be 0.08%-0.12%, the present application reduces the polymerization degree of the slag glass network and the slag viscosity; at the same time, by controlling the S content to be 0.015%-0.035%, the present application reduces the surface tension of the molten pool, so that the arc force received by the molten pool and the arc force reach a balance, which leads to the aggregation of the slag and the reduction of the distribution area of the slag; in summary, under the synergistic effect of Si, Mn, Ti and S, the present application ensures that the slag generated on the weld surface after welding can be easily removed, significantly reduces the slag removal time, and improves the production efficiency; in addition, by controlling the C, Si, Mn and Ti contents, the present application ensures that the weld contains a large amount of acicular ferrite, reduces the generation of side plate ferrite and bainite, controls the P and S contents on this basis, reduces the cold brittleness and avoids hot cracking, and thus improves the impact toughness.

[0031] 2. The preparation method of the gas shielded solid welding wire with high weldability provided by the present application comprises the following steps: controlling the S content of the molten iron, the basicity of the refining slag and the FeO+MnO content in the refining slag to stably control the S content in the gas shielded solid welding wire; controlling the roughness of the rolling groove and the steel passing amount of the finishing mill to ensure the flatness of the wire rod, and then combining with reasonable mechanical peeling and copper plating processes to ensure uniform copper plating of the gas shielded solid welding wire and ensure that the gas shielded solid welding wire has excellent wire feeding stability; controlling the finishing mill inlet temperature, the wire feeding temperature and the controlled cooling process to ensure that the wire rod has sufficient strength, and then ensure that the gas shielded solid welding wire has sufficient strength, so that the gas shielded solid welding wire has excellent wire feeding stability, and then has good arc stability, reduces welding spatter, and is suitable for long-time welding; specifically:

[0032] the roughness of the rolling groove is controlled to be 0.3-0.6 μm, the steel passing amount of the rolling groove is ≤500 t, the surface of the wire rod has good flatness (high surface quality), the wire rod is peeled in the drawing process, the oxide scale is removed clean, and copper plating is used after drawing to make the surface of the gas shielded solid welding wire uniformly plated with copper, so that the gas shielded solid welding wire has excellent wire feeding stability;

[0033] By controlling the finish rolling inlet temperature to be 810-850 DEG C, the wire spitting temperature to be 820-850 DEG C, and controlling the cooling speed to be 0.5-1 DEG C / s, the wire rod temperature out of the heat preservation cover is less than or equal to 550 DEG C, on the basis of ensuring the drawing performance of the wire rod, the wire rod can also be ensured to have sufficient tensile strength, and then the gas shield solid welding wire can be ensured to have sufficient tensile strength, and the wire feeding stability of the gas shield solid welding wire is improved.

[0034] 3. The preparation method of the gas shield solid welding wire with high weldability provided by the present application, in the process of the small square billet continuous casting, the Ti element in the steel can react with the protective slag, the lubricating effect of the protective slag is reduced, and the billet is prone to have slag inclusion and depression, the drawing speed is controlled to be 2.7-2.9 m / min, the low casting drawing speed can ensure the stability of the continuous casting process, and the occurrence of the slag inclusion and depression is avoided, so that the surface quality of the billet is improved, and the surface quality of the wire rod is improved.

[0035] 4. The preparation method of the gas shield solid welding wire with high weldability provided by the present application, the molten steel has a high Ti content, and there is a risk of nozzle clogging, the superheat of the molten steel is controlled to be 35-50 DEG C, the flowability of the molten steel is improved, and the casting is carried out normally.

[0036] 5. The preparation method of the gas shield solid welding wire with high weldability provided by the present application, horizontal shell stripping and vertical shell stripping are adopted, the oxidation scale on the surface of the wire rod can be easily stripped off, and the oxidation scale can be removed completely. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0038] Fig. 1 is the spatter diagram in the nozzle of Example 1 of the present application;

[0039] Fig. 2 is the spatter diagram in the nozzle of Comparative Example 3 of the present application. DETAILED DESCRIPTION

[0040] The following examples are provided to better further understand the present application, and do not limit the content and protection scope of the present application, and do not limit the content and protection scope of the present application, and any person under the enlightenment of the present application or the combination of the present application with other prior art features can obtain any product same or similar to the present application, which falls within the protection scope of the present application.

[0041] The specific experimental steps or conditions not indicated in the examples can be carried out according to the conventional experimental steps described in the literature in the art or the operation or conditions. The reagents or instruments used are not indicated by the manufacturer, which are conventional reagent products that can be obtained by purchase.

[0042] The main role of each chemical component in the application and the selection of its amount are analyzed and described in detail as follows:

[0043] C: can effectively improve the strength of the weld, but too much C will promote the formation of bainite, thereby deteriorating the low temperature impact toughness, and will increase the crack sensitivity, affecting the welding performance, and the C content in the application is 0.06%-0.09%.

[0044] Si: the main deoxidizing element in the welding process, but too high Si content will not only increase the viscosity of the slag, making it difficult to remove the slag, but also promote the formation of side plate ferrite, reducing the low temperature impact toughness, and the Si content in the application is 0.25%-0.45%.

[0045] Mn: the main deoxidizing element in the welding process, which can effectively improve the strength of the weld, promote the formation of acicular ferrite, and reduce the viscosity of the slag, but too high Mn content will promote the formation of bainite, reduce the low temperature impact toughness of the weld, and the Mn content in the application is 1.3%-1.6%.

[0046] S: can reduce the surface tension of the molten pool, ensure good weld forming, and also make the arc force and surface tension of the molten pool balanced, resulting in the aggregation of the slag, thereby reducing the distribution area of the slag on the weld, facilitating the removal of the slag, but too high S content can easily cause hot cracks and reduce the low temperature impact toughness, and the S content in the application is 0.015%-0.035%.

[0047] P: will segregate at the grain boundary of the steel, increasing the cold brittleness of the steel, and too high P content will significantly reduce the low temperature impact toughness of the weld, and the P content in the application is ≤0.015%.

[0048] Ti: Ti can form oxide particles, promote intracrystalline acicular ferrite nucleation, improve the low temperature impact toughness of the weld, and also reduce the viscosity of the slag and improve the removal performance of the slag, and the Ti content in the application is 0.08%-0.12%.

[0049] Al, Ca: can form high melting point inclusions, which will cause spatter to increase during welding, and the content should be as low as possible, and the Al content in the application is ≤0.008%, and the Ca content is ≤0.0010%.

[0050] The application will be further described in detail in combination with specific examples, which cannot be understood as limiting the scope of the application claimed.

[0051] Examples and comparative examples

[0052] A gas shielded solid wire with high welding performance comprises the following mass percentage components as shown in Table 1, and Table 1 does not show the balance of Fe and unavoidable impurities.

[0053] Table 1 Chemical composition (wt%) of gas shielded solid wires of each example and comparative example

[0054]

[0055] The specific process method of each example and comparative example is as follows:

[0056] (1) Converter smelting

[0057] The molten iron and scrap steel are added to the converter for smelting, the scrap steel is clean scrap steel, the mass ratio of molten iron is ≥78%, the S content of molten iron is 0.05%-0.07%, and low-aluminum silicon iron (Al≤0.05%) and low-carbon manganese iron (C≤0.7%) are added in sequence at 1 / 3 tapping for deoxidization and alloying, and the tapping temperature is 1610℃-1650℃;

[0058] (2) LF refining

[0059] The basicity of the refining slag is controlled to be 1.6-2.1, calcium carbide is added to the refining slag for diffusion deoxidization, the content of FeO+MnO in the refining slag is controlled to be 1.2%-1.8%, and Ti wire is fed when the oxygen content is 0.0020%-0.0040%, and the argon flow rate is 30NL / min-80NL / min when the Ti wire is fed;

[0060] It should be noted that the content of FeO+MnO is the sum of the contents of FeO and MnO;

[0061] (3) Small square billet continuous casting

[0062] Full protection casting is carried out by using a large ladle long nozzle and an immersed nozzle, the superheat degree of the molten steel is 35℃-50℃, the pulling speed is 2.7m / min-2.9m / min, the total flow rate of the secondary cooling water is 500L / min-600L / min, and the secondary cooling section adopts four-zone water mist cooling, and the flow rate ratio of the water flow in the first zone to the fourth zone is 30-40:35-45:12-20:6-12;

[0063] (4) High-speed wire rolling

[0064] The temperature of the soaking section of the heating furnace is 1050℃-1100℃, the soaking time of the soaking section is 35min-50min, the roughness Ra of the rolling groove of the finishing mill is 0.3μm-0.6μm, the rolling groove of the finishing mill passes ≤500 tons of steel, the inlet temperature of the finishing mill is 810℃-850℃, and the wire laying temperature is 820℃-850℃;

[0065] (5) Cooling

[0066] The cooling speed of the wire rod is controlled to be 0.5-1 ℃ / s by closing the insulation cover of the Stelmor cooling line, and the temperature of the wire rod out of the insulation cover is ≤550 ℃.

[0067] (6) Drawing

[0068] The wire rod is subjected to mechanical peeling, sand belt polishing and drawing, and then is subjected to copper plating by electroplating. The mechanical peeling is performed by using vertical peeling wheels and horizontal peeling wheels, and the thickness of the copper plating layer is controlled to be 0.3-0.8 μm.

[0069] The examples and comparative examples do not feed titanium wire in the LF refining process.

[0070] The production process parameters of the examples and comparative examples are shown in Tables 2-4.

[0071] Table 2 Process parameters of the converter smelting, refining and billet continuous casting steps of the examples and comparative examples

[0072]

[0073] Table 3 Process parameters of the high-speed wire rolling step of the examples and comparative examples

[0074]

[0075] Table 4 Process parameters of the cooling and drawing steps of the examples and comparative examples

[0076]

[0077] Experimental examples

[0078] The tensile strength of the wire rod and the flux-cored wire prepared from the examples and comparative examples is tested according to GB / T 228.1 “Metallic Materials-Tensile Testing-Part 1: Method of Test at Room Temperature”, and the results are shown in Table 5.

[0079] Weld mechanical property detection: The deposited metal test and mechanical property detection are performed according to GB / T 8110-2020 “Non-alloy and Fine Grain Steel Solid Wire for Gas Shielded Arc Welding”, the welding current is 280 A, the voltage is 27 V, the protective gas is 80% Ar+20% CO2, and the results are shown in Table 5.

[0080] Welding process performance detection: the welding current is 300 A, the voltage is 30 V, the protective gas is 80% Ar+20% CO2, the welding duration is 1 h, the weight of the spatter in the nozzle and the slag removal time are counted, and the results are shown in Table 5.

[0081] Table 5 Performance test results of the gas shielded solid wire prepared in the examples and the comparative examples

[0082]

[0083] As can be seen from the above table, the gas shielded solid wire prepared in the example 1 to the example 4 has the spatter weight < 5g in the nozzle, the slag removal time ≤ 2min, and the impact toughness of the deposited metal ≥ 150J, and the comprehensive performance is significantly better than that of the comparative example 1 to the comparative example 4. In the comparative example 1 to the comparative example 4, the gas shielded solid wire has high Si content, low S content and no Ti element, which leads to difficult slag removal. The gas shielded solid wire has no Ti element and high Si content, which leads to low impact toughness. The roughness of the rolling groove of the finishing mill is large, the steel amount passing through the rolling groove is high, and the chemical copper plating is used, which leads to poor copper plating quality of the gas shielded solid wire. At the same time, the tensile strength of the gas shielded solid wire is low, which leads to low wire feeding stability and large welding spatter.

[0084] The spatter in the nozzle after welding of the gas shielded solid wire prepared in the example 1 and the comparative example 3 is as shown in Figs. 1-2 The spatter in the nozzle of the example 1 is less, only 3.5g, which indicates that the wire feeding stability of the gas shielded solid wire is good and can adapt to long time welding. The spatter in the nozzle of the comparative example 3 is more, 20.2g, which indicates that the wire feeding stability of the gas shielded solid wire is poor and cannot adapt to long time welding.

[0085] Obviously, the above examples are only examples for clearly illustrating, but not limit the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A gas shielded solid welding wire with high weldability, characterized in that: The chemical composition of the gas shielded solid welding wire is calculated by mass ratio as follows: C: 0.06%-0.09%, Si: 0.25%-0.45%, Mn: 1.3%-1.6%, S: 0.015%-0.035%, P≤0.015%, Ti: 0.08%-0.12%, Al≤0.008%, Ca≤0.0010%, the rest are Fe and unavoidable impurities; The method for producing the high-weldability gas-shielded solid welding wire comprises the following steps: (1) Converter smelting: molten iron and scrap steel are added to a converter for smelting, wherein the molten iron has a sulfur content of 0.05%-0.07%; (2) Refining: The basicity of the refining slag is 1.6-2.1, and the content of FeO+MnO in the refining slag is 1.2%-1.8%; when feeding the Ti line, the flow rate of the bottom blowing argon is 30NL / min-80NL / min; (3) Billet continuous casting: the casting speed is 2.7m / min-2.9m / min, the total flow rate of secondary cooling water is 500L / min-600L / min, the secondary cooling section adopts four-zone water mist cooling, and the water volume of the first to fourth zones is distributed in the order of 30-40:35-45:12-20:6-12; (4) High-speed wire rolling: the inlet temperature of the finishing rolling is 810℃-850℃, the spinning temperature is 820℃-850℃, the groove roughness is 0.3μm-0.6μm, and the amount of steel passing through the groove is ≤500t; (5) Cooling: The cooling rate is 0.5℃ / s-1℃ / s, and the temperature out of the insulation cover is ≤550℃; (6) Wire drawing: The cooled wire rod is shelled, drawn, and copper-plated to obtain the wire rod; the shelling step includes horizontal shelling and vertical shelling; the copper plating method is electroplating; The tensile strength of the gas-shielded solid welding wire is ≥1200 MPa, the spatter weight in the nozzle is <5 g, and the welding slag removal time is ≤2 min.

2. A method for producing a gas shielded solid welding wire with high weldability according to claim 1, characterized in that: The method includes the following steps: (1) Converter smelting: molten iron and scrap steel are added to a converter for smelting, wherein the molten iron has a sulfur content of 0.05%-0.07%; (2) Refining: The basicity of the refined slag is 1.6-2.1, and the content of FeO+MnO in the refined slag is 1.2%-1.8%; (3) Continuous casting of small square billets; (4) High-speed wire rolling: The inlet temperature of finishing rolling is 810℃-850℃, and the spinning temperature is 820℃-850℃; (5) Cooling: The cooling rate is 0.5℃ / s-1℃ / s, and the temperature out of the insulation cover is ≤550℃; (6) Wire drawing: The cooled wire rod is shelled, drawn and copper-plated to obtain the wire rod.

3. The method for producing a gas shielded solid welding wire with high weldability according to claim 2, characterized in that: In the refining step, calcium carbide is added, and Ti wire is fed when the oxygen content is 0.0020%-0.0040%.

4. The method for producing a gas shielded solid welding wire with high weldability according to claim 2, characterized in that: During the continuous casting process of small square billets, large long nozzles and submerged nozzles are used for full-protection casting, and the superheat of the molten steel is 35℃-50℃.

5. The method for producing a gas shielded solid welding wire with high weldability according to claim 2, characterized in that: During the high-speed wire rolling process, the soaking section temperature is 1050℃-1100℃, and the soaking section holding time is 35min-50min.

6. The method for producing a gas shielded solid welding wire with high weldability according to claim 2, characterized in that: During the controlled cooling process, all Stelmor cooling line insulation covers are closed.

7. The method for producing a gas shielded solid welding wire with high weldability according to claim 2, characterized in that: The method further comprises a belt grinding step after the shelling; And / or, the copper plating layer has a thickness of 0.3 μm-0.8 μm.

8. The method for producing a gas shielded solid welding wire with high weldability according to claim 2, characterized in that: In step (1), the scrap steel includes clean scrap steel; and / or, the mass of the molten iron accounts for ≥78% of the total mass of the molten iron and the scrap steel, And / or, when 1 / 3 of the steel is tapped, low aluminum ferrosilicon and low carbon ferromanganese are sequentially added for deoxidation and alloying, the tapping temperature is 1610°C-1650°C, the Al content in the low aluminum ferrosilicon is ≤0.05%, and the C content in the low carbon ferromanganese is ≤0.7%.

9. Use of the high-weldability gas-shielded solid welding wire according to claim 1 or the high-weldability gas-shielded solid welding wire prepared by the production method according to any one of claims 2 to 8 in household appliance compressors and automobile parts.

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