High-weldability gas shielded solid welding wire and production method and application thereof

Abstract

The invention relates to the technical field of welding materials, and discloses a high-weldability gas shielded solid welding wire and a production method and application thereof.By controlling the content of Si, Mn and Ti, the polymerization degree of a welding slag glass network is reduced, and the viscosity of welding slag is reduced; meanwhile, the S content is controlled, the surface tension of a molten pool is reduced, the surface tension and electric arc force borne by the molten pool are balanced, welding slag is gathered, and the distribution area of the welding slag is reduced; in conclusion, under the synergistic effect of silicon, manganese, titanium and sulfur, it is ensured that welding slag generated on the surface of a welded joint is easy to remove, the welding slag removing time is remarkably shortened, and the production efficiency is improved; besides, by controlling the content of C, Si, Mn and Ti, it is ensured that a welding seam contains a large amount of acicular ferrite, generation of side batten ferrite and bainite is reduced, on the basis, the content of P and S is controlled, cold brittleness is reduced, hot cracks are avoided, and therefore the impact toughness is improved.

Description

Technical Field

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

[0002] Gas shielded welding is commonly used to connect household appliance compressors, automotive parts, and automotive chassis components. This results in slag forming on the weld surface after welding. Because slag is an insulator, the area where it is located cannot form an electrophoretic coating during the electrophoretic coating process. In a corrosive environment, the portion where the electrophoretic coating is not formed becomes the starting point for rust, significantly shortening the service life of the component. To improve the electrophoretic coating state of welded joints, the slag must be removed beforehand. However, the slag generated by gas shielded welding wire is currently difficult to remove, resulting in a significant decrease in production efficiency. Furthermore, to ensure long-term welding operations without reducing welding efficiency, the welding wire needs to have excellent wire feeding stability to prevent spatter from clogging the nozzle and interrupting welding.

[0003] The prior art discloses a 500MPa grade low slag gas shielded solid welding wire for the automotive industry. 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 mass of each component is The sum of the scores is 100%. By increasing the C content in the solid welding wire, deoxidation is performed during welding to reduce the burnout of Mn and Si alloy elements, thereby reducing the amount of slag after welding of the solid welding wire. After changing the slag system, the welding slag is dispersed in a tiny shape on the surface of the weld metal, and no continuous welding slag is formed. However, the increase in the C content cannot change the welding slag system, and the welding slag on the surface of the weld metal cannot form an electrophoretic coating. Therefore, manual slag cleaning is still required. The high Si content in the welding wire causes the welding slag to have a large viscosity, which is more difficult to remove.

[0004] The related art discloses a controlled-aluminum low-slag gas shielded solid wire for the automotive industry. The wire comprises components with the following mass fractions: 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%, and the balance is Fe and inevitable impurities. The sum of the mass fractions of all components is 100%. By adding the content of Al to the solid wire, the slag system after welding of the solid wire is changed, so that the slag system after welding is changed from the MnO-SiO2 slag system to the MnO-SiO2-Al2O3 slag system. After changing the slag system, the welding slag is distributed in the weld metal in a tiny and dispersed manner, and no continuous slag inclusions are formed in sheets; however, adding the Al element to the wire will cause a significant increase in welding spatter, affecting the continuous progress of welding operations.

[0005] The related art discloses an extra-low silicon wire with excellent porosity resistance and electrophoretic coating properties. By weight percentage, it includes: C: 0.001% - 0.30%, Si < 0.15%, Mn: 0.50% - 3.00%, P < 0.030%, S < 0.030%, and the balance is Fe and inevitable impurities. By reducing the content of Si element in the wire, the slag system after welding is changed from the MnO-SiO2 slag system to the MnO slag system. However, too low Si content will reduce the deoxidation effect, significantly increase the number of inclusions in the weld, and lead to a decrease in impact toughness.

[0006] Therefore, how to reduce the difficulty of removing welding slag, avoid nozzle blockage caused by spatter, and improve the impact toughness of the weld to produce a gas shielded solid wire with high welding performance is a technical problem urgently to be solved in this field. Summary of the Invention

[0007] In view of this, the present invention provides a gas shielded solid wire with high weldability to solve the problems of great difficulty in removing welding slag, obvious spatter, and poor impact toughness during the welding process.

[0008] In a first aspect, the present invention provides a gas shielded solid wire with high weldability. The chemical composition of the gas shielded solid wire is as follows by mass ratio: 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.

[0009] In some alternative embodiments, at least one of the following conditions is satisfied: the tensile strength ≥ 1200 MPa, the spatter weight inside the nozzle < 5 g, and the slag removal time ≤ 2 min.

[0010] In a second aspect, the present invention provides a production method for the gas shielded solid wire with high weldability described in the first aspect, comprising the following steps; (1) Converter smelting: Molten iron and scrap steel are added to the converter for smelting. In the molten iron, the S content is 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%; (3) Bloom continuous casting; (4) High - speed wire rolling: The inlet temperature of the finish rolling is 810 °C - 850 °C, and the laying - head temperature is 820 °C - 850 °C; (5) Cooling: The cooling rate is 0.5 °C / s - 1 °C / s, and the temperature when exiting the heat - preservation hood ≤ 550 °C; (6) Drawing: Obtained by subjecting the cooled wire rod to shelling, drawing, and copper - plating.

[0011] In some alternative embodiments, in the refining step, calcium carbide is added, and when the oxygen content is 0.0020% - 0.0040%, Ti wire is fed. When feeding the Ti wire, the flow rate of bottom - blown argon is 30 NL / min - 80 NL / min.

[0012] In some alternative embodiments, during the bloom continuous casting process, full - protection casting is carried out using a tundish long nozzle and an immersion nozzle. The superheat of the molten steel is 35 °C - 50 °C, the drawing speed is 2.7 m / min - 2.9 m / min, the total flow rate of secondary cooling water is 500 L / min - 600 L / min, and the secondary cooling section uses four - zone water mist cooling. The water volume distribution from the first zone to the fourth zone is 30 - 40:35 - 45:12 - 20:6 - 12 in sequence.

[0013] In some alternative embodiments, during the high - speed wire rolling process, the soaking section temperature is 1050 °C - 1100 °C, the soaking section holding time is 35 min - 50 min, the roughness of the rolling groove is 0.3 μm - 0.6 μm, and the steel - passing amount of the rolling groove ≤ 500 t.

[0014] In some alternative embodiments, during the controlled cooling process, all the heat - preservation hoods of the Stelmor cooling line are closed. The cooling rate of the wire rod is 0.5 °C / s - 1 °C / s, and the temperature when the wire rod exits the heat - preservation hood ≤ 550 °C.

[0015] In some alternative embodiments, the shelling step includes horizontal shelling and vertical shelling.

[0016] In some alternative embodiments, after the shelling, a step of abrasive belt grinding is further included.

[0017] In some alternative embodiments, the thickness of the copper plating layer is 0.3 μm - 0.8 μm.

[0018] In some alternative embodiments, in step (1), the scrap steel includes clean scrap steel; In some alternative embodiments, the mass ratio of the hot metal to the total mass of the hot metal and the scrap steel is ≥ 78%.

[0019] In some alternative embodiments, when 1 / 3 of the steel is tapped, low-aluminum ferrosilicon and low-carbon ferromanganese are added in sequence for deoxidation 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%.

[0020] In a third aspect, the present invention provides an application of the gas shielded solid wire with high weldability prepared by the gas shielded solid wire with high weldability described in the first aspect or the production method described in the second aspect in household voltage compressors and automotive parts.

[0021] Compared with the prior art, the technical solution of the present invention has the following advantages: 1. For the gas shielded solid wire with high weldability provided by the present invention, the chemical composition of the gas shielded solid wire is by mass ratio: 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 polymerization degree of the slag glass network is reduced, and the slag viscosity is reduced; at the same time, by controlling the S content to be 0.015% - 0.035%, the surface tension of the molten pool is reduced, so that it reaches an equilibrium with the arc force received by the molten pool, resulting in slag aggregation and reducing the distribution area of the slag; in summary, under the synergistic action of silicon, manganese, titanium, and sulfur in the present invention, it is ensured that the slag generated on the surface of the weld after welding is easily removed, significantly reducing the slag removal time and improving production efficiency; in addition, by controlling the C, Si, Mn, and Ti contents, it is ensured that a large amount of acicular ferrite is contained in the weld, reducing the generation of side plate ferrite and bainite, and on this basis, controlling the P and S contents to reduce cold brittleness and avoid hot cracks, thereby improving the impact toughness.

[0022] 2. The preparation method of the gas shielded solid wire with high weldability provided by the present invention stably controls the S content in the gas shielded solid wire by controlling the S content of the molten iron, the basicity of the refining slag, and the content of FeO + MnO in the refining slag; by controlling the roughness of the rolling groove of the finishing mill and the amount of steel passing through, the flatness of the wire rod is ensured, and then combined with a reasonable mechanical descaling and copper plating process to ensure uniform copper plating of the gas shielded solid wire, ensuring excellent wire feeding stability of the gas shielded solid wire; by controlling the entry temperature of the finishing mill, the wire laying temperature, and the controlled cooling process, the wire rod is ensured to have sufficient strength, and then the strength of the gas shielded solid wire is ensured, ensuring excellent wire feeding stability of the gas shielded solid wire, and further ensuring good arc stability, reducing welding spatter, and adapting to long-term welding; specifically: Control the roughness of the rolling groove to be 0.3μm - 0.6μm, and the amount of steel passing through the rolling groove ≤ 500t to ensure good flatness (high surface quality) of the wire rod surface. After descaling in the wire drawing process, the scale is removed cleanly, and electroplating is used for copper plating after drawing, finally making the surface of the gas shielded solid wire uniformly copper plated, ensuring excellent wire feeding stability of the gas shielded solid wire; By controlling the entry temperature of the finishing mill to be 810°C - 850°C, the wire laying temperature to be 820°C - 850°C, and controlling the cooling rate to be 0.5°C / s - 1°C / s, and the temperature of the wire rod leaving the heat preservation cover ≤ 550°C, on the basis of ensuring the drawing performance of the wire rod, it can also ensure that the wire rod has sufficient tensile strength, and then ensure that the gas shielded solid wire has sufficient tensile strength, improving the wire feeding stability of the gas shielded solid wire.

[0023] 3. In the continuous casting process of small billets for the preparation method of the gas shielded solid wire with high weldability provided by the present invention, the Ti element in the steel will react with the protective slag, reducing the lubrication effect of the protective slag and easily causing slag inclusions and depressions in the cast billet. The present invention controls the casting speed to be 2.7m / min - 2.9m / min. The lower casting speed can ensure the stability of the continuous casting process, avoid the occurrence of slag inclusions and depressions, thereby improving the surface quality of the cast billet and the surface quality of the wire rod.

[0024] 4. For the preparation method of the gas shielded solid wire with high weldability provided by the present invention, the Ti content in the molten steel of the present invention is relatively high, and there is a risk of nozzle coking. Controlling the superheat of the molten steel to be 35°C - 50°C can improve the fluidity of the molten steel and enable normal casting.

[0025] 5. For the preparation method of the gas shielded solid wire with high weldability provided by the present invention, horizontal descaling and vertical descaling are adopted, which can make the scale on the wire rod surface easily peel off, facilitating the complete removal of the scale. Brief Description of the Drawings

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is the splashing diagram inside the nozzle in Embodiment 1 of the present invention; Figure 2 is the splashing diagram inside the nozzle in Comparative Example 3 of the present invention. Specific Embodiments

[0028] The following embodiments are provided to better further understand the present invention, which is not limited to the best embodiment, and does not limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with those of other prior arts falls within the protection scope of the present invention.

[0029] For those not indicating specific experimental steps or conditions in the embodiments, the operations or conditions of the conventional experimental steps described in the literature in this field can be followed. For the reagents or instruments not indicating the manufacturer, they are all conventional reagent products that can be obtained through commercial purchase.

[0030] The following specifically analyzes and explains the main functions of each chemical component in the present invention and the selection of its dosage: C: Can effectively improve the strength of the weld, but excessive C will promote the formation of bainite, thereby deteriorating the low-temperature impact toughness, and at the same time will increase the crack sensitivity and affect the welding performance. In the present invention, the C content is 0.06% - 0.09%.

[0031] Si: The main deoxidizing element during welding. However, if the Si content is too high, it will not only increase the viscosity of the welding slag, making it difficult to remove the welding slag, but also promote the formation of side plate ferrite and reduce the low-temperature impact toughness. In the present invention, the Si content is 0.25% - 0.45%.

[0032] Mn: The main deoxidizing element during welding, which can effectively improve the strength of the weld, promote the formation of acicular ferrite, and reduce the viscosity of the welding slag. However, if the Mn content is too high, it will promote the formation of bainite and reduce the low-temperature impact toughness of the weld. In the present invention, the Mn content is 1.3% - 1.6%.

[0033] S: It can reduce the surface tension of the molten pool, ensure good weld formation, and can also balance the arc force and surface tension acting on the molten pool, leading to the aggregation of slag, thereby narrowing the distribution area of the slag on the weld bead and facilitating slag removal. However, too high an S content is likely to cause hot cracks and reduce the low-temperature impact toughness. In the present invention, the S content is 0.015% - 0.035%.

[0034] P: It will segregate at the grain boundaries of the steel, increasing the cold brittleness of the steel. Too high a P content will significantly reduce the low-temperature impact toughness of the weld. In the present invention, the P content ≤ 0.015%.

[0035] Ti: Ti can form oxide particles, promote the nucleation of intragranular acicular ferrite, improve the low-temperature impact toughness of the weld, and can also reduce the slag viscosity and improve the slag removal performance. In the present invention, the Ti content is 0.08% - 0.12%.

[0036] Al, Ca: They can form high-melting-point inclusions, which will cause an increase in spatter during welding, and their contents should be as low as possible. In the present invention, the Al content ≤ 0.008% and the Ca content ≤ 0.0010%.

[0037] The present invention will be further described in detail below in conjunction with specific embodiments, and these embodiments should not be construed as limiting the scope of protection required by the present invention.

[0038] Examples and Comparative Examples A gas shielded solid wire with high welding performance comprises the following components by mass percentage as shown in Table 1. Table 1 does not show the balance as Fe and inevitable impurities.

[0039] Table 1 Chemical Compositions of Gas Shielded Solid Wires in Each Example and Comparative Example (wt%)

[0040] The specific process methods for each example and comparative example are as follows: (1) Converter Smelting Molten iron and scrap steel are added to the converter for smelting. The scrap steel uses clean scrap steel, and the mass ratio of molten iron is ≥ 78%. The S content of the molten iron is 0.05% - 0.07%. When 1 / 3 of the steel is tapped, low-aluminum ferrosilicon (Al ≤ 0.05%) and low-carbon ferromanganese (C ≤ 0.7%) are added in sequence for deoxidation alloying, and the tapping temperature is 1610°C - 1650°C; (2) LF Refining Control the basicity of the refining slag to be 1.6 - 2.1, add calcium carbide for diffusion deoxidation of the refining slag, control the content of FeO + MnO in the refining slag to be 1.2% - 1.8%, and feed the Ti wire when the oxygen content is 0.0020% - 0.0040%. When feeding the Ti wire, the bottom blowing argon gas flow rate is 30 NL / min - 80 NL / min; It should be noted that the FeO + MnO content is the sum of the contents of FeO and MnO; (3)Continuous casting of small billets Full protection casting is carried out by using a long tundish nozzle and an immersion nozzle. The superheat of the molten steel is 35°C - 50°C, the drawing speed is 2.7 m / min - 2.9 m / min, the total flow rate of secondary cooling water is 500 L / min - 600 L / min, and the secondary cooling section uses four-zone water mist cooling. The flow rate ratio of water volume from the first zone to the fourth zone is 30 - 40:35 - 45:12 - 20:6 - 12; (4)High-speed wire rolling The soaking section temperature of the heating furnace is 1050°C - 1100°C, the soaking time in the soaking section is 35 min - 50 min, the roughness Ra of the rolling groove of the finishing mill is 0.3 μm - 0.6 μm, the steel passing amount through the rolling groove of the finishing mill is ≤ 500 tons, the inlet temperature of the finishing mill is 810°C - 850°C, and the laying head temperature is 820°C - 850°C; (5)Controlled cooling All the heat preservation covers of the Stelmor cooling line are closed. The cooling speed of the wire rod is controlled at 0.5°C / s - 1°C / s, and the temperature of the wire rod when it exits the heat preservation cover is ≤ 550°C; (6)Wire drawing After the wire rod undergoes mechanical descaling, abrasive belt grinding, and wire drawing, electroplating is used for copper plating. Mechanical descaling is carried out using a vertical descaling wheel and a horizontal descaling wheel. The thickness of the copper plating layer is controlled at 0.3 μm - 0.8 μm during copper plating.

[0041] In Comparative Example 1 - Comparative Example 4, no titanium wire is fed during the LF refining process.

[0042] The production process parameters of the above-mentioned examples and comparative examples are shown in Tables 2 - 4.

[0043] Table 2 Process parameters of the converter smelting, refining, and continuous casting of small billets in examples and comparative examples

[0044] Table 3 Process parameters of the high-speed wire rolling step in examples and comparative examples

[0045] Table 4 Process parameters of the cooling and wire drawing steps in examples and comparative examples

[0046] Experimental example The tensile strength of the gas shielded solid wire prepared in the above examples and comparative examples was tested for the wire rod and the gas shielded solid wire 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; Weld mechanical property testing: The deposited metal test was carried out according to GB / T 8110-2020 "Solid wires for gas-shielded metal arc welding of non-alloy and fine-grained steels", and the mechanical properties were tested. The welding current was 280 A, the voltage was 27 V, and the shielding gas was 80% Ar + 20% CO2. The results are shown in Table 5.

[0047] The welding process performance testing was as follows: The welding current was 300 A, the voltage was 30 V, the shielding gas was 80% Ar + 20% CO2, and the welding duration was 1 h. The spatter weight inside the nozzle and the slag removal time were statistically counted. The results are shown in Table 5.

[0048] Table 5 Performance test results of the gas-shielded solid wires prepared in the examples and comparative examples

[0049] As can be seen from the above table, for the gas-shielded solid wires prepared in Examples 1-4 of the present invention, the spatter weight inside the nozzle < 5 g, the slag removal time ≤ 2 min, and the low-temperature impact toughness of the deposited metal ≥ 150 J. The comprehensive performance is significantly better than that of Comparative Examples 1-4. In Comparative Examples 1-4, the gas-shielded solid wires have a high Si content, a low S content, and no Ti element, resulting in difficult slag removal. The gas-shielded solid wires do not contain Ti element and have a high Si content, resulting in low impact toughness. The roughness of the rolling grooves of the finishing mill is large, the steel passing amount of the rolling grooves is high, and electroless copper plating is used, resulting in poor copper plating quality of the gas-shielded solid wires. At the same time, the tensile strength of the gas-shielded solid wires is low, resulting in low wire feeding stability and large welding spatter.

[0050] The spatter situation inside the nozzle after welding of the gas-shielded solid wires prepared in Example 1 and Comparative Example 3 of the present invention is as Figure 1 - Figure 2 shown. There is less spatter inside the nozzle in Example 1, only 3.5 g, indicating good wire feeding stability of the gas-shielded solid wire and it can adapt to long-time welding. There is more spatter inside the nozzle in Comparative Example 3, which is 20.2 g, indicating poor wire feeding stability of the gas-shielded solid wire and it cannot adapt to long-time welding.

[0051] Obviously, the above examples are only for clearly illustrating the examples and are not intended to limit the implementation modes. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation modes here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A gas shielded solid wire with high weldability, characterized in that, The chemical composition of the gas shielded solid wire is as follows by mass ratio: 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 unavoidable impurities.

2. The gas shielded solid wire with high weldability according to claim 1, characterized in that, It shall satisfy at least any one of the following conditions: Tensile strength ≥ 1200 MPa, spatter weight inside the nozzle < 5 g, slag removal time ≤ 2 min.

3. The production method of the gas shielded solid wire with high weldability according to claim 1 or 2, characterized in that, It includes the following steps: (1) Converter smelting: Molten iron and scrap steel are added to the converter for smelting. In the molten iron, the S content is 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%. (3) Small billet continuous casting; (4) High-speed wire rolling: The inlet temperature of the finish rolling is 810°C - 850°C, and the laying temperature is 820°C - 850°C. (5) Cooling: The cooling rate is 0.5°C / s - 1°C / s, and the temperature out of the heat preservation cover ≤ 550°C. (6) Wire drawing: Obtained by subjecting the cooled wire rod to shelling, drawing, and copper plating.

4. The production method of the gas shielded solid wire with high weldability according to claim 3, characterized in that, In the refining step, calcium carbide is added, and when the oxygen content is 0.0020% - 0.0040%, Ti wire is fed. When feeding the Ti wire, the flow rate of bottom-blown argon is 30 NL / min - 80 NL / min.

5. The production method of the gas shielded solid wire with high weldability according to claim 3, characterized in that During the small billet continuous casting process, full protection casting is carried out using a large ladle long nozzle and an immersion nozzle. The superheat of the molten steel is 35°C - 50°C, the drawing speed is 2.7 m / min - 2.9 m / min, the total flow rate of secondary cooling water is 500 L / min - 600 L / min, and the secondary cooling section uses four-zone water mist cooling. The water volume distribution from the first zone to the fourth zone is 30 - 40:35 - 45:12 - 20:6 - 12 in sequence.

6. The production method of the gas shielded solid wire with high weldability according to claim 3, characterized in that, During the high-speed wire rolling process, the soaking section temperature is 1050°C - 1100°C, the soaking time in the soaking section is 35 min - 50 min, the roughness of the rolling groove is 0.3 μm - 0.6 μm, and the steel passing amount of the rolling groove ≤ 500 t.

7. The production method of the gas shielded solid wire with high weldability according to claim 3, characterized in that, During the controlled cooling process, all the heat preservation covers of the Stelmor cooling line are closed. The cooling rate of the wire rod is 0.5°C / s - 1°C / s, and the temperature of the wire rod out of the heat preservation cover ≤ 550°C.

8. The production method of the gas shielded solid wire with high weldability according to claim 3, characterized in that, The shelling step includes horizontal shelling and vertical shelling; And / or, after the shelling, it further includes a sand belt grinding step; And / or, the thickness of the copper plating layer is 0.3 μm - 0.8 μm.

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

10. Application of the gas shielded solid wire with high weldability as described in claim 1 or 2, or the gas shielded solid wire with high weldability prepared by the production method as described in any one of claims 3 - 9, in household voltage compressors and automotive parts.

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