Manufacturing method of pre-coated welding strip

Abstract

The invention provides a manufacturing method of a pre-coated welding strip, which is characterized in that when the pre-coated welding strip is coated with a pre-coating layer, the pre-coated welding strip is electrified, and the pre-coated welding strip is positioned in a short circuit. The heat of the welding strip is utilized, a small amount of external heating is supplemented, and the heat of metal is fully utilized to promote curing, so that the curing efficiency is improved, the energy loss is reduced by 75%, the production efficiency is improved by 80%, and the manufacturing cost of the small-wire-diameter pre-coating welding strip is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic new energy, and in particular relates to a method for manufacturing a pre-coated welding strip. Background Art

[0002] The cost per kilowatt-hour of battery-level components is gradually decreasing, and the biggest goal of photovoltaic components and accessories is to reduce costs and increase efficiency. The market demand for pre-coated solder strip products is getting higher and higher. Pre-coated solder strip products can play a special role in different usage scenarios that ordinary solder strips do not have. These coatings with special functions usually apply liquid or paste organic materials on the surface of metal solder strips, and then use special methods to control the film thickness and solidify the film, so as to achieve a close combination of the polymer composite layer and the metal substrate, thereby obtaining a photovoltaic solder strip with a special layer.

[0003] Since the drying and curing of polymer materials must be completed at a sufficient temperature and for a sufficient time, the curing of the coating has always limited the production efficiency of pre-coated photovoltaic solder strips. The existing technology usually uses drying tunnels, hot air pipes, turbine centrifuges and other devices to dry the surface of pre-coated solder strips. Compared with the conventional tin coating rate, this method has low efficiency and high energy consumption. At the same time, the miniaturization of solder strips is an inevitable trend. When the wire diameter of the solder strip becomes smaller, it is bound to cause a decrease in processing efficiency, resulting in high processing costs for thin-wire pre-coated solder strips, which cannot meet the needs of cost reduction and efficiency improvement. Summary of the invention

[0004] In order to solve at least one technical problem in the prior art, a method for manufacturing a pre-coated welding strip is provided, which has high processing efficiency and low cost. In order to achieve the above technical objectives, the technical solution adopted in the embodiment of the present invention is: An embodiment of the present invention provides a method for manufacturing a pre-coated solder strip. When the pre-coated solder strip is coated with a pre-coating layer, power is supplied to the pre-coated solder strip at the same time, and the pre-coated solder strip is placed in a short circuit.

[0005] Further, the following steps are included: Step S1, tinning: passing the substrate through a tin furnace to add a solder layer on the surface of the substrate; Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, and the air pressure of the coating controlled air knife is set so that the substrate and the surface solder layer are cooled to a first preset temperature, and the thickness of the solder layer on the surface of the substrate reaches a preset thickness; Step S3, atomizing air knife treatment: subjecting the solder layer treated by the coating control air knife in step S2 to atomizing air knife treatment, setting the air pressure of the atomizing air knife so that the substrate and the surface solder layer are cooled to a second preset temperature, thereby obtaining a tin strip; Step S4, coating and drying: electrode guide wheels are arranged at both ends of the coating device, and the electrode guide wheels are energized. The tin ribbon in step S3 is passed through the coating device and the electrode guide wheels, so that the tin ribbon is in a short-circuit state while being coated with the pre-coating layer. The power of the electrode guide wheels is set to 80-300W, and the current is set to 5-15A. The electrode guide wheels gradually heat the tin ribbon and the pre-coating layer to a third preset temperature and dry them to obtain a dried tin ribbon; Step S5, cooling: cooling the dried tin strip obtained in step S4 to obtain the pre-coated solder strip.

[0006] Furthermore, in step S1, the temperature of the tin furnace is set to 180-240°C.

[0007] Further, in step S2, the wind pressure of the coating control wind knife is set to 1.0-1.4 KPa; And / or, the first preset temperature is 170-190° C.; And / or, the preset thickness of the solder layer is 10-20 μm.

[0008] Further, in step 3, the wind pressure of the atomizing air knife is set to 2.0-6.0 KPa; And / or, the specification of the atomized particles of the atomizing air knife is set to 0.1-2 μm; And / or, the second preset temperature is 110-120°C; Furthermore, in step S4, the third preset temperature is 120-140°C.

[0009] Furthermore, in step S4, the coating is performed by spraying, brushing, curtain coating or dipping.

[0010] Furthermore, in step S5, the cooling is air cooling, and the wind speed of the air cooling is set to 80-300 m / min.

[0011] Furthermore, the diameter of the pre-coated welding strip is 0.18-0.3 mm.

[0012] Furthermore, in step S1 to step S5, the overall running speed of the pre-coated welding strip is 180-250 m / min.

[0013] The technical solution provided by the embodiment of the present invention has the following beneficial effects: (1) In the embodiment of the present invention, a short-circuit current is passed through the solder strip during the coating of the pre-coating layer on the solder strip, so that the pre-coating layer solvent is rapidly volatilized. Only a small amount of current power loss is required to achieve efficient heating of the solder strip, so that the pre-coating layer is rapidly dried.

[0014] (2) The embodiment of the present invention makes full use of the heat brought out of the solder strip from the tin furnace and keeps the temperature of the solder strip within a reasonable range during the entire preparation process, thereby achieving multiple thermodynamic changes such as solder solidification, coating drying, and film layer solidification. The design is reasonable and more energy-efficient.

[0015] (3) Compared with the production process of pre-coated solder strips in the prior art, the embodiments of the present invention reduce energy consumption by about 75%, greatly reducing the manufacturing cost of the pre-coated solder strips. At the same time, the line speed can reach 250 meters per minute, and the production efficiency is improved by nearly 80%, making the pre-coated solder strips more fully equipped for large-scale production. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] In addition, it should be understood that after reading the contents disclosed in the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the protection scope defined by the present invention.

[0018] An embodiment of the present invention provides a method for manufacturing a pre-coated solder strip. When the pre-coated solder strip is coated with a pre-coating layer, power is simultaneously supplied to the pre-coated solder strip, and the pre-coated solder strip is placed in a short-circuit circuit. When the pre-coated solder strip is coated, the heat of the solder strip itself after tinning and the heat generated when a short-circuit current is passed through the solder strip are fully utilized to efficiently heat and solidify the polymer coating on the surface of the solder strip.

[0019] Further, the following steps are included: Step S1, tinning: passing the substrate through a tin furnace to add a solder layer on the surface of the substrate; The material of the substrate is not limited, for example, it can be copper strip or other alloy strips, etc. The commonly used substrate in this field is copper strip. The shape of the substrate is also not limited, for example, it can be a round strip or a rectangular flat strip.

[0020] Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, and the air pressure of the coating controlled air knife is set so that the substrate and the surface solder layer are cooled to a first preset temperature, and the thickness of the solder layer on the surface of the substrate reaches a preset thickness; Through the coating controlled air knife treatment, not only the temperature of the substrate and the surface solder layer can be reduced, but also the thickness of the solder layer on the surface of the substrate can be made more uniform, which is beneficial to the subsequent drying of the solder layer.

[0021] Step S3, atomizing air knife treatment: subjecting the solder layer treated by the coating control air knife in step S2 to atomizing air knife treatment, setting the air pressure of the atomizing air knife so that the substrate and the surface solder layer are cooled to a second preset temperature, thereby obtaining a tin strip; After being treated by the coating-controlled air knife, the solder layer on the surface of the substrate is still in a liquid state. At this time, the atomized liquid particles generated by the atomizing air knife can form a large number of microscopic pits on the surface of the solder layer, thereby increasing the surface area of ​​the solder layer by 50% to 75%, which is beneficial to further reduce the temperature of the solder layer and gradually solidify it, which is beneficial to subsequent coating on the surface of the solder layer.

[0022] Step S4, coating and drying: electrode guide wheels are arranged at both ends of the coating device, and the electrode guide wheels are energized. The tin ribbon in step S3 is passed through the coating device and the electrode guide wheels, so that the tin ribbon is in a short-circuit state while being coated with the pre-coating layer. The power of the electrode guide wheels is set to 80-300W, and the current is set to 5-15A. For example, the power can be 80W, 100W, 150W, 200W, 250W, 300W, etc., and the current is 5A, 7A, 9A, 11A, 13A, 15A, etc. The electrode guide wheels gradually heat up the tin ribbon and the pre-coating layer to a third preset temperature and dry them to obtain a dried tin ribbon; In this step, since the electrode guide wheels are provided at both ends of the coating device, the electrode guide wheel at one end is the positive electrode and the electrode guide wheel at the other end is the negative electrode, a low-voltage and high-current DC power supply is passed through the electrode guide wheels, so that a short-circuit current is formed between the electrode guide wheels and the tin ribbon, so that the tin ribbon generates heat, and then the pre-coating layer coated on the surface of the tin ribbon dries. This method uses the heat of the tin ribbon itself to accelerate the volatilization of the pre-coating layer solvent, so that the pre-coating layer gradually dries. It has a simple structure and is more energy-saving, time-saving and efficient than traditional methods.

[0023] It should be noted that the heat generated by the tin ribbon can be controlled by adjusting the current and power of the electrode guide wheel. The power and current described in the present application can make the temperature of the tin ribbon be at a third preset temperature, that is, between 120 and 140°C. This temperature is slightly lower than the melting point of the solder layer, which can ensure that the solder layer is not affected and allow the pre-coating layer to dry quickly.

[0024] Step S5, cooling: cooling the dried tin strip obtained in step S4 to obtain the pre-coated solder strip.

[0025] Further, in step S1, the temperature of the tin furnace is set to 180-240°C, for example, 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, etc., to match different solders.

[0026] Further, in step S2, the wind pressure of the coating control wind knife is set to 1.0-1.4 KPa, for example, 1.0 KPa, 1.2 KPa, 1.3 KPa, 1.4 KPa, etc.; And / or, the first preset temperature is 170-190° C., for example, 170° C., 175° C., 180° C., 185° C., 190° C., etc.; And / or, the preset thickness of the solder layer is 10-20 μm, for example, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, etc.

[0027] Further, in step 3, the wind pressure of the atomizing air knife is set to 2.0-6.0 KPa, for example, 2.0 KPa, 3.0 KPa, 4.0 KPa, 5.0 KPa, 6.0 KPa, etc.; And / or, the specification of the atomized particles of the atomizing air knife is set to 0.1-2 μm, for example, 0.1 μm, 0.12 μm, 0.15 μm, 0.18 μm, 2.0 μm, etc.; And / or, the second preset temperature is 110-120° C., for example, 110° C., 112° C., 115° C., 118° C., 120° C., etc.; Further, in step S4, the third preset temperature is 120-140°C, for example, it can be 120°C, 125°C, 130°C, 135°C, 140°C, etc.

[0028] Furthermore, in step S4, the coating is one of spray coating, brush coating, flow coating or dip coating, which can be specifically selected according to actual needs. During coating, the thickness of the pre-coating layer is not limited and can be appropriately adjusted and selected according to the thickness required in the art.

[0029] Further, in step S5, the cooling is air cooling, and the wind speed of the air cooling is set to 80-300 m / min, for example, 80 m / min, 100 m / min, 150 m / min, 200 m / min, 250 m / min, 300 m / min, etc.

[0030] Furthermore, the diameter of the pre-coated welding tape is 0.18-0.3 mm, for example, it can be 0.18 mm, 0.2 mm, 0.23 mm, 0.25 mm, 0.28 mm, 0.3 mm, etc.

[0031] Furthermore, in step S1 to step S5, the overall running speed of the pre-coated welding tape is 180-250 m / min, for example, 180 m / min, 200 m / min, 220 m / min, 250 m / min, etc.

[0032] Example 1 A method for manufacturing a pre-coated welding strip comprises the following steps: Step S1, tin coating: passing the substrate through a tin furnace, setting the temperature of the tin furnace to 210° C., and adding a solder layer on the surface of the substrate; Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, and the wind pressure of the coating controlled air knife is set to 1.2 KPa, so that the substrate and the surface solder layer are cooled to 180° C., and the thickness of the solder layer on the surface of the substrate reaches 15 μm; Step S3, atomizing air knife treatment: the solder layer treated by the coating control air knife in step S2 is treated by atomizing air knife, the air pressure of the atomizing air knife is set to 4.0 Kpa, the specification of the atomized particles is 1 μm, so that the substrate and the surface solder layer are cooled to 115° C., and a tin strip is obtained; Step S4, coating and drying: electrode guide wheels are arranged at both ends of the coating device, and the electrode guide wheels are energized. The tin ribbon in step S3 is passed through the coating device and the electrode guide wheels, so that the tin ribbon is in a short-circuit state while being coated with the pre-coating layer. The power of the electrode guide wheels is set to 190W and the current is set to 10A. The electrode guide wheels heat the tin ribbon and the pre-coating layer to 130°C and dry them to obtain a dried tin ribbon; Step S5, cooling: air-cooling the dried solder strip obtained in step S4, setting the wind speed of the air cooling to 190 m / min, to obtain the pre-coated solder strip; The diameter of the pre-coated welding strip is 0.25mm and the overall running speed is 200m / min.

[0033] Example 2 A method for manufacturing a pre-coated welding strip comprises the following steps: Step S1, tin coating: passing the substrate through a tin furnace, setting the temperature of the tin furnace to 180° C., and adding a solder layer on the surface of the substrate; Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, and the wind pressure of the coating controlled air knife is set to 1.0 KPa, so that the substrate and the surface solder layer are cooled to 190° C., and the thickness of the solder layer on the surface of the substrate reaches 20 μm; Step S3, atomizing air knife treatment: the solder layer treated by the coating control air knife in step S2 is treated by atomizing air knife, the air pressure of the atomizing air knife is set to 2.0 Kpa, the specification of the atomized particles is 0.1 μm, so that the substrate and the surface solder layer are cooled to 120° C., and a tin strip is obtained; Step S4, coating and drying: electrode guide wheels are arranged at both ends of the coating device, and the electrode guide wheels are energized. The tin ribbon in step S3 is passed through the coating device and the electrode guide wheels, so that the tin ribbon is in a short-circuit state while being coated with the pre-coating layer. The power of the electrode guide wheels is set to 80W and the current is set to 5A. The electrode guide wheels heat the tin ribbon to 120°C and dry it to obtain a dried tin ribbon. Step S5, cooling: air-cooling the dried solder strip obtained in step S4, setting the wind speed of the air cooling to 300 m / min, to obtain the pre-coated solder strip; The diameter of the pre-coated welding strip is 0.18mm and the overall running speed is 180m / min.

[0034] Example 3 A method for manufacturing a pre-coated welding strip comprises the following steps: Step S1, tin coating: passing the substrate through a tin furnace, setting the temperature of the tin furnace to 240° C., and adding a solder layer on the surface of the substrate; Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, the wind pressure of the coating controlled air knife is set to 1.4 KPa, the specification of the atomized particles is 2 μm, so that the substrate and the surface solder layer are cooled to 170° C., and the thickness of the solder layer on the surface of the substrate reaches 10 μm; Step S3, atomizing air knife treatment: the solder layer treated by the coating control air knife in step S2 is treated by atomizing air knife, and the air pressure of the atomizing air knife is set to 6.0 Kpa, so that the substrate and the surface solder layer are cooled to 110° C., and a tin strip is obtained; Step S4, coating and drying: electrode guide wheels are arranged at both ends of the coating device, and the electrode guide wheels are energized. The tin ribbon in step S3 is passed through the coating device and the electrode guide wheels, so that the tin ribbon is in a short-circuit state while being coated with the pre-coating layer. The power of the electrode guide wheels is set to 300 W and the current is set to 15 A. The electrode guide wheels heat the tin ribbon to 140° C. and dry it to obtain a dried tin ribbon; Step S5, cooling: air-cooling the dried solder strip obtained in step S4, setting the wind speed of the air cooling to 80 m / min, to obtain the pre-coated solder strip; The diameter of the pre-coated welding strip is 0.3mm and the overall running speed is 250m / min.

[0035] Comparative Example 1 A method for manufacturing a pre-coated welding strip comprises the following steps: Step S1, tin coating: passing the substrate through a tin furnace, setting the temperature of the tin furnace to 210° C., and adding a solder layer on the surface of the substrate; Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, the wind pressure of the coating controlled air knife is set to 2.0 KPa, the specification of the atomized particles is 1 μm, so that the substrate and the surface solder layer are cooled to 180° C., and the thickness of the solder layer on the surface of the substrate reaches 5 μm; Step S3, atomizing air knife treatment: the solder layer treated by the coating control air knife in step S2 is treated by atomizing air knife, and the air pressure of the atomizing air knife is set to 4.0 Kpa, so that the substrate and the surface solder layer are cooled to 115° C., and a tin strip is obtained; Step S4, coating and drying: electrode guide wheels are arranged at both ends of the coating device, and the electrode guide wheels are energized. The tin ribbon in step S3 is passed through the coating device and the electrode guide wheels, so that the tin ribbon is in a short-circuit state while being coated with the pre-coating layer. The power of the electrode guide wheels is set to 190W and the current is set to 10A. The electrode guide wheels heat the tin ribbon to 130°C and dry it to obtain a dried tin ribbon; Step S5, cooling: air-cooling the dried solder strip obtained in step S4, setting the wind speed of the air cooling to 190 m / min, to obtain the pre-coated solder strip; The diameter of the pre-coated welding strip is 0.25mm and the overall running speed is 200m / min.

[0036] Comparative Example 2 A method for manufacturing a pre-coated welding strip comprises the following steps: Step S1, tin coating: passing the substrate through a tin furnace, setting the temperature of the tin furnace to 210° C., and adding a solder layer on the surface of the substrate; Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, the wind pressure of the coating controlled air knife is set to 1.2 KPa, the specification of the atomized particles is 1 μm, so that the substrate and the surface solder layer are cooled to 180° C., and the thickness of the solder layer on the surface of the substrate reaches 15 μm; Step S3, atomizing air knife treatment: the solder layer treated by the coating control air knife in step S2 is treated by atomizing air knife, and the air pressure of the atomizing air knife is set to 4.0 Kpa, so that the substrate and the surface solder layer are cooled to 115° C. to obtain a tin strip; Step S4, coating and drying: electrode guide wheels are set at both ends of the coating device, and power is supplied to the electrode guide wheels. The tin ribbon in step S3 is passed through the coating device and the electrode guide wheels so that the tin ribbon is in a short-circuit state while being coated with the pre-coating layer. The power of the electrode guide wheels is set to 400W and the current is set to 20A.

[0037] The overall running speed of the pre-coated welding strip is 200m / min.

[0038] In this comparative example, the solder layer on the surface of the substrate melted and the pre-coating layer could not be successfully applied.

[0039] Comparative Example 3 A method for manufacturing a pre-coated welding strip comprises the following steps: Step S1, tin coating: passing the substrate through a tin furnace, setting the temperature of the tin furnace to 210° C., and adding a solder layer on the surface of the substrate; Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, the wind pressure of the coating controlled air knife is set to 1.2 KPa, the specification of the atomized particles is 1 μm, so that the substrate and the surface solder layer are cooled to 180° C., and the thickness of the solder layer on the surface of the substrate reaches 15 μm; Step S3, atomizing air knife treatment: the solder layer treated by the coating control air knife in step S2 is treated by atomizing air knife, and the air pressure of the atomizing air knife is set to 4.0 Kpa, so that the substrate and the surface solder layer are cooled to 115° C. to obtain a tin strip; Step S4, coating a pre-coating layer: the tin strip in step S3 is processed by the coating device so that the surface of the tin strip is coated with a pre-coating layer; Step S5, drying treatment: drying the solder strip coated with the pre-coating layer in step S4 in a hot air pipe; Step S6, cooling: air-cooling the dried solder strip obtained in step S5, setting the wind speed of the air cooling to 190 m / min, to obtain the pre-coated solder strip.

[0040] The diameter of the pre-coated solder strip is 0.3mm.

[0041] In this comparative example, when the overall operating speed is 200 m / min, a dry pre-coated solder strip cannot be obtained. Only when the overall operating speed is reduced to 100-120 m / min can the coating on the surface of the tin strip be dried, and at this time the heating power of the hot air pipe needs to reach 530 W, which is much higher than the energy consumption data in Example 1.

[0042] Application Examples It can be seen from Example 1 and Comparative Example 1 that the wind pressure of the coating-controlled air knife in Comparative Example 1 is too high, resulting in the solder layer of the pre-coated solder strip product being too thin. In actual use, the sample in Example 1 can obtain a welding tension of not less than 1.5 N / mm, and the false solder joint rate is less than 0.3%; while the samples in the comparative example have an average welding force of only 0.73 N / mm, and a false solder joint rate of 12.7%, and effective welding cannot be performed, and are unqualified products.

[0043] It can be seen from Example 1 and Comparative Example 2 that when the pre-coating layer is actually applied in Comparative Example 2, the current passed through the soldering tape is too large, which directly causes the solder layer to melt and the pre-coating layer cannot be successfully applied, thus resulting in an unqualified product.

[0044] It can be seen from Example 1 and Comparative Example 3 that in Comparative Example 3, the precoat layer on the precoat strip cannot be dried at the same operating speed by using an external heating source of a hot air pipe. Only when the operating speed is reduced to 100-120 m / min can the dried precoat strip be obtained. This method has a long drying time and high energy consumption. In Example 1 of the present invention, the drying method of the precoat layer is improved by passing current through the electrode guide wheel so that the precoat strip is in a short-circuit state while the precoat layer is applied. This drying method is time-saving and energy-saving, and the operating speed is increased by nearly 100%, and the energy consumption of the overall production process is reduced by 75%.

[0045] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for manufacturing a pre-coated welding strip, characterized in that: When the pre-coating layer is applied to the pre-coating solder strip, power is supplied to the pre-coating solder strip at the same time, so that the pre-coating solder strip is in a short circuit.

2. The method for manufacturing a pre-coated welding tape according to claim 1, characterized in that: The following steps are involved: Step S1, tinning: passing the substrate through a tin furnace to add a solder layer on the surface of the substrate; Step S2, coating controlled air knife treatment: the substrate coated with the solder layer in step S1 is subjected to a coating controlled air knife, and the air pressure of the coating controlled air knife is set so that the substrate and the surface solder layer are cooled to a first preset temperature, and the thickness of the solder layer on the surface of the substrate reaches a preset thickness; Step S3, atomizing air knife treatment: subjecting the solder layer treated by the coating control air knife in step S2 to atomizing air knife treatment, setting the air pressure of the atomizing air knife so that the substrate and the surface solder layer are cooled to a second preset temperature, thereby obtaining a tin strip; Step S4, coating and drying: electrode guide wheels are arranged at both ends of the coating device, and the electrode guide wheels are energized. The tin ribbon in step S3 is passed through the coating device and the electrode guide wheels, so that the tin ribbon is in a short-circuit state while being coated with the pre-coating layer. The power of the electrode guide wheels is set to 80-300W, and the current is set to 5-15A. The electrode guide wheels gradually heat the tin ribbon and the pre-coating layer to a third preset temperature and dry them to obtain a dried tin ribbon; Step S5, cooling: cooling the dried tin strip obtained in step S4 to obtain the pre-coated solder strip.

3. The method for manufacturing a pre-coated welding tape according to claim 1, characterized in that: In step S1, the temperature of the tin furnace is set to 180-240°C.

4. The method for manufacturing a pre-coated welding strip according to claim 1, characterized in that: In step S2, the wind pressure of the coating control air knife is set to 1.0-1.4 KPa; And / or, the first preset temperature is 170-190° C.; And / or, the preset thickness of the solder layer is 10-20 μm.

5. The method for manufacturing a pre-coated welding tape according to claim 1, characterized in that: In step 3, the wind pressure of the atomizing air knife is set to 2.0-6.0 KPa; And / or, the specification of the atomized particles of the atomizing air knife is set to 0.1-2 μm; And / or, the second preset temperature is 110-120°C.

6. The method for manufacturing a pre-coated welding tape according to claim 1, characterized in that: In step S4, the third preset temperature is 120-140°C.

7. The method for manufacturing a pre-coated welding tape according to claim 1, characterized in that: In step S4, the coating is performed by spraying, brushing, shower coating or dipping.

8. The method for manufacturing a pre-coated welding tape according to claim 1, characterized in that: In step S5, the cooling is air cooling, and the wind speed of the air cooling is set to 80-300 m / min.

9. The method for manufacturing a pre-coated welding tape according to claim 1, characterized in that: The diameter of the pre-coated welding strip is 0.18-0.3 mm.

10. The method for manufacturing a pre-coated welding tape according to claim 1, characterized in that: In step S1 to step S5, the overall running speed of the pre-coated welding tape is 180-250 m / min.