Strip steel welding control method, device and equipment

Abstract

The invention discloses a strip steel welding control method, device and equipment. The method comprises the steps that target working parameters set for a welding machine are obtained; selecting a target welding wire from the plurality of welding wires to be selected, wherein the chemical components of the target welding wire comprise C, Mn, Si, P and S; and based on the target working parameters, the welding machine is controlled to heat the welding positions of the two adjacent strip steels and the target welding wire so as to weld the two adjacent strip steels, and the silicon content of each of the two adjacent strip steels is 3.5%-4.5%. The technical problem that the welding quality and the welding efficiency cannot be met at the same time is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and particularly relates to a welding control method, device and equipment for strip steel. Background Art

[0002] In the current normalization process of high-silicon products, strip steel needs to be butt-jointed with strip steel and laser welded to achieve continuous production in the normalization process or annealing process, so as to improve production efficiency. However, with the increase of the silicon content in the strip steel, the welding difficulty increases significantly. For high-silicon products with a silicon content reaching 3.5% - 4.5%, due to the stable thermal properties of silicon, it is very difficult for traditional welding processes to shape high-silicon products. When directly butt-welding two high-silicon products using existing processes, gaps or curling often occur at the welding positions.

[0003] In order to solve the problem that gaps or curling often occur at the welding positions, in the prior art, a silicon-free product is often connected between two high-silicon products to be butt-welded. Although the welding quality is improved, since an extra weld seam needs to be welded, the production time is doubled, the production capacity is reduced, and the economic benefits are directly affected. Therefore, the technical problem that welding quality and welding efficiency cannot be satisfied simultaneously needs to be solved urgently. Summary of the Invention

[0004] The embodiments of the present invention provide a welding control method, device and equipment for strip steel, which solve the technical problem that welding quality and welding efficiency cannot be satisfied simultaneously.

[0005] In a first aspect, the embodiments of the present invention provide a welding control method for strip steel, including: obtaining target working parameters set for a welding machine; selecting a target welding wire from multiple candidate welding wires, and the chemical components of the target welding wire include C, Mn, Si, P, and S; based on the target working parameters, controlling the welding machine to heat the welding positions of two adjacent strip steels and the target welding wire to weld the two adjacent strip steels, and the silicon content of each of the two adjacent strip steels is 3.5% - 4.5%.

[0006] In combination with the first aspect of the present invention, in some embodiments, the chemical components and their contents of the target welding wire include: C: 0.01% - 0.5%, Mn: 0.1% - 1.0%, Si: 0.01% - 0.1%, P: 0.01% - 0.1%, S: 0.01% - 0.1%.

[0007] In combination with the first aspect of the present invention, in some embodiments, the target working parameters include the welding shielding gas pressure, and the welding shielding gas pressure is 5 bar - 10 bar.

[0008] In connection with the first aspect of the present invention, in some embodiments, the target working parameter includes the welding speed, and the welding speed is 2.0 m / min to 5.0 m / min.

[0009] In connection with the first aspect of the present invention, in some embodiments, the target working parameter includes the welding head pressure, and the welding head pressure is 5 KN to 10 KN.

[0010] In connection with the first aspect of the present invention, in some embodiments, the target working parameter includes the heating power, and the heating power is 10 KW to 20 KW.

[0011] In connection with the first aspect of the present invention, in some embodiments, the target working parameters include the clamp gap amount and the wire feeding speed, the clamp gap amount is 0.4 mm to 0.6 mm, and the wire feeding speed is 3 m / min to 5 m / min.

[0012] In connection with the first aspect of the present invention, in some embodiments, after controlling the welder to heat the welding position of two adjacent strip steels and the target welding wire based on the target working parameters, it further includes: after an interval of a preset duration, controlling a first heating device to heat the welding position.

[0013] In a second aspect, an embodiment of the present invention provides a welding control device for strip steel, including: a parameter acquisition unit for acquiring target working parameters set for the welder; a welding wire selection unit for selecting a target welding wire from a plurality of candidate welding wires, and the chemical components of the target welding wire include C, Mn, Si, P, and S; a welder control unit for controlling the welder to heat the welding position of two adjacent strip steels and the target welding wire based on the target working parameters to weld the two adjacent strip steels, and the silicon content of each of the two adjacent strip steels is 3.5% to 4.5%.

[0014] In a third aspect, an embodiment of the present invention provides a welding device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the method described in any one of the first aspect is implemented.

[0015] One or more technical solutions provided by the embodiments of the present invention at least achieve the following technical effects or advantages: In an embodiment of the present invention, target working parameters set for a welding machine are obtained; a target welding wire is selected from multiple candidate welding wires, and the chemical components of the target welding wire include C, Mn, Si, P, and S; based on the target working parameters, the welding machine is controlled to heat the welding position of two adjacent strip steels and the target welding wire to weld the two adjacent strip steels, and the silicon content of each of the two adjacent strip steels is 3.5% - 4.5%. The target welding wire and the target working parameters determined through repeated verification can optimize the metallographic structure of the welding position, avoid gaps or curling and warping at the welding position, thereby improving the weld strength and thus the welding quality. In addition, adding a silicon-free product between two adjacent strip steels is also avoided, thereby shortening the welding time and improving the welding efficiency. Therefore, both welding quality and welding efficiency are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a flowchart of the strip steel welding control method in an embodiment of the present invention; Figure 2 It is a schematic diagram of connecting a silicon-free product in the prior art; Figure 3 It is a functional module diagram of the strip steel welding control device in an embodiment of the present invention; Figure 4 It is a schematic structural diagram of the welding equipment in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] In the present invention, descriptions such as "first" and "second" are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unimplementable, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] An embodiment of the present invention provides a method for controlling the welding of strip steel. Referring to Figure 1 as shown, the method includes the following steps S101 to S103: S101: Obtain the target working parameters set for the welding machine.

[0021] It should be noted that the welding machine may be a laser welding machine.

[0022] In some embodiments, the target working parameters include the welding shielding gas pressure, and the welding shielding gas pressure is 5 bar to 10 bar.

[0023] It should be noted that plasma clouds are generated during laser welding, and the plasma clouds will prevent the laser of the welding machine from acting on the welding position, reducing the utilization rate of the laser power. Therefore, controlling the welding shielding gas pressure to be 5 bar to 10 bar realizes increasing the welding shielding gas pressure on the basis of the set value, which can effectively disperse the plasma clouds generated during laser welding and improve the utilization rate of the laser power. Additionally, controlling the welding shielding gas pressure to be 5 bar to 10 bar can effectively disperse the oxygen near the welding position, thereby avoiding the occurrence of poor welding due to oxidation at the welding position and improving the welding quality.

[0024] In some embodiments, the target working parameters include the welding speed, and the welding speed is 2.0 m / min to 5.0 m / min.

[0025] It should be noted that when the welding speed is too low, although the molten metal is achieved, the strip steel is deformed due to excessive heat absorption by the strip steel, reducing the welding quality. When the welding speed is too high, the temperature of the molten pool is insufficient, which is likely to cause defects such as incomplete penetration, lack of fusion, too small penetration depth in the heat affected zone, and poor weld formation, resulting in a decrease in the weld strength and thus reducing the welding quality. Therefore, after repeated verification, by changing the welding speed and recording and comparing the relationship curves among the welding speed, penetration depth in the heat affected zone, absorbed laser energy, strip steel deformation amount, and weld strength, the result is that when the welding speed is 2.0 m / min to 5.0 m / min, a suitable welding speed is selected, making the penetration depth in the heat affected zone at the welding position greater than or equal to the preset thickness, avoiding strip steel deformation caused by too low welding speed and also avoiding a decrease in weld strength caused by too high welding speed, thereby improving the welding quality.

[0026] It should be noted that the welding speed is 2.0 m / min to 5.0 m / min, making the penetration depth in the heat affected zone at the welding position greater than or equal to the preset thickness, and the preset thickness can be the strip steel thickness at the position to be welded of the strip steel.

[0027] In some embodiments, the target working parameters include the welding head pressure, and the welding head pressure is 5 KN to 10 KN.

[0028] It should be noted that when the welding head pressure is too high, uneven thickness deformation will occur at the welding position of both strip steels. When the welding head pressure is too low, the strip steel cannot be fully unfolded from its original curled state, affecting the normal progress of welding and thus reducing the welding quality. After repeated verification, by changing the welding head pressure and recording and comparing the relationship curves among the welding head pressure, strip steel flatness, strip steel deformation amount, and weld strength, the result is that the best effect is achieved when the welding head pressure is 5 KN to 10 KN. It not only avoids uneven thickness deformation at the welding position of the strip steel but also avoids the strip steel not being fully unfolded from its original curled state. Therefore, the welding quality is improved.

[0029] In some embodiments, the target working parameters include the heating power, and the heating power is 10 KW to 20 KW.

[0030] It should be noted that in the case of excessive heating power, the strip steel deforms due to excessive heat absorption, reducing the welding quality. In the case of too low heating power, the temperature of the molten pool is insufficient, which easily leads to defects such as incomplete penetration, lack of fusion, poor weld formation, and too small penetration depth in the heat affected zone, resulting in a decrease in weld strength and a reduction in welding quality. Therefore, through repeated verification, by changing the heating power and recording and comparing the relationship curves among the heating power, penetration depth in the heat affected zone, absorbed laser energy, strip steel deformation amount, and weld strength, the result is that when the heating power is 10KW - 20KW, an appropriate heating power is selected, making the penetration depth in the heat affected zone of the welding position greater than or equal to the preset thickness, avoiding strip steel deformation caused by excessive heating power, and also avoiding a decrease in weld strength caused by too low heating power, thereby improving the welding quality.

[0031] In some embodiments, the target working parameters include the clamp gap amount and the wire feeding speed. The clamp gap amount is 0.4mm - 0.6mm, and the wire feeding speed is 3m / min - 5m / min.

[0032] It should be noted that when the clamp gap amount is too high or the wire feeding speed is too high, the gap at the welding position cannot be completely filled, resulting in grooves on the surface of the strip steel. When the clamp gap amount is too low or the wire feeding speed is too low, the welding wire overflows densely, resulting in protrusions on the surface of the strip steel. To ensure sufficient wire feeding into the gap and ensure the surface finish of the strip steel, through repeated verification, by changing the clamp gap amount and the wire feeding speed and recording and comparing the relationship curves among the clamp gap amount, the wire feeding speed, and the surface finish of the strip steel, the appropriate ranges of the clamp gap amount and the wire feeding speed are found, that is, the clamp gap amount is 0.4mm - 0.6mm, and the wire feeding speed is 3m / min - 5m / min. At this time, the surface finish of the strip steel is optimal, achieving the beneficial effect of improving the surface finish of the strip steel.

[0033] S102: Select a target welding wire from multiple candidate welding wires. The chemical composition of the target welding wire includes C, Mn, Si, P, and S.

[0034] In some embodiments, the chemical composition and its content of the target welding wire include: C: 0.01% - 0.5%, Mn: 0.1% - 1.0%, Si: 0.01% - 0.1%, P: 0.01% - 0.1%, S: 0.01% - 0.1%.

[0035] It should be noted that for ordinary welding wires, it is necessary to add silicon-free products between high-silicon strip steels and they cannot be directly welded. Therefore, through repeated verification, by changing the chemical composition and its content of the welding wire and recording and comparing the relationship curves among the chemical composition and its content of the welding wire and the weld strength, the result is the above-mentioned target welding wire, which maximizes the weld strength and improves the welding quality.

[0036] S103: Based on the target working parameters, control the welding machine to heat the welding position of two adjacent strip steels and the target welding wire to weld the two adjacent strip steels, and the silicon content of each strip steel in the two adjacent strip steels is 3.5% - 4.5%.

[0037] It should be noted that strip steels with a silicon content reaching the level of 3.5% - 4.5% are high-silicon strip steels. Due to the stable thermal properties of silicon, it is difficult for traditional welding processes to shape high-silicon products, and the plasticity of high-silicon strip steels is poor.

[0038] In some embodiments, after controlling the welding machine to heat the welding position of two adjacent strip steels and the target welding wire based on the target working parameters, it may further include: after an interval of a preset duration, control the first heating device to heat the welding position.

[0039] It should be noted that through experimental verification, after welding is completed, controlling the first heating device to heat the welding position can optimize the metallographic structure of the welding position, avoid gaps or curling and warping at the welding position, thereby improving the weld strength and thus the welding quality.

[0040] In some embodiments, before controlling the welding machine to heat the welding position of two adjacent strip steels and the target welding wire based on the target working parameters, it may further include: controlling the second heating device to preheat the welding position.

[0041] It should be noted that through experimental verification, before welding is completed, controlling the second heating device to preheat the welding position can soften the strip steel at the welding position in advance, which is beneficial for subsequent welding, can avoid gaps or curling and warping at the welding position, thereby improving the weld strength and thus the welding quality.

[0042] Referring to Table 1 shown below, Table 1 is an example of the selection of target working parameters in the embodiments of the present invention. The thickness in Table 1 refers to the strip steel thickness of two adjacent strip steels at the position to be welded, and the silicon content in Table 1 refers to the silicon content of two adjacent strip steels. The two adjacent strip steels may include a first strip steel and a second strip steel. For example, assume that the silicon content of the first strip steel is 3.55% and the silicon content of the second strip steel is 3.57%, the strip steel thickness of the first strip steel at the position to be welded is 2 mm, and the strip steel thickness of the second strip steel at the position to be welded is 2 mm. Then, the shielding gas pressure may be 6 bar, the welding speed may be 4.8 m / min, the welding head pressure may be 9 KN, the heating power may be 10 KW, the clamp gap amount may be 0.5 mm, and the wire feeding speed may be 3 m / min.

[0043] Table 1: It should be noted that high-silicon products are ferrosilicon soft magnetic alloys with very low carbon content, and are important and indispensable materials in the power, electronics and military industries. Based on the continuous improvement of users' technical requirements for product iron loss, strength, etc., products with higher silicon content have become the choice of more and more market customers. In the normalizing process of existing high-silicon products, it is necessary to connect the strips together and perform laser welding to achieve continuous production in the normalizing process or annealing process to improve production efficiency.

[0044] It should be noted that the embodiment of the present invention optimizes and remodels the welding wire material, gradually verifies the influence of welding wires of different materials on the weld quality, and explores the optimal low-alloy welding wire. The stainless steel welding wire is modified into a new low-alloy welding wire, which optimizes the metallographic structure of the weld area and improves the weld strength. The embodiment of the present invention verifies the weld quality under different shielding gas pressures through experiments. The experiment shows that appropriately increasing the welding shielding gas pressure can effectively improve the weld quality. The embodiment of the present invention optimizes welding parameters such as welding speed, welding head pressure, heating power, clamp gap, and wire feeding speed to the extreme, improves the tolerance of the welding machine to problems such as poor raw material plate shape, and improves the overall weld quality and strength.

[0045] refer to Figure 2 As shown, in the prior art, a silicon-free product is often connected between two high-silicon products that need to be welded. Although the welding quality is improved, the production time is doubled due to the need to weld an extra weld, which reduces production capacity and directly affects economic benefits. The addition of silicon-free products increases manufacturing costs. Moreover, since silicon-free products are mixed between high-silicon products, the temperature of the normalizing furnace fluctuates greatly during production, affecting product performance.

[0046] The embodiment of the present invention obtains the target working parameters set for the welding machine; selects the target welding wire from a plurality of welding wires to be selected, and the chemical composition of the target welding wire includes C, Mn, Si, P and S; based on the target working parameters, controls the welding machine to heat the welding position and the target welding wire of two adjacent steel strips to weld the two adjacent steel strips, and the silicon content of each of the two adjacent steel strips is 3.5% to 4.5%. The target welding wire and target working parameters determined through repeated verification can optimize the metallographic structure of the welding position, avoid gaps or curling and warping at the welding position, and thus improve the strength of the weld, thereby improving the welding quality. In addition, it also avoids adding silicon-free products between two adjacent steel strips, which shortens the welding time and improves the welding efficiency. Therefore, both welding quality and welding efficiency are achieved.

[0047] Based on the same inventive concept, Figure 3As shown in the figure, an embodiment of the present invention provides a welding control device 10 for strip steel, including: a parameter acquisition unit 110, configured to acquire target working parameters set for a welding machine; a welding wire selection unit 120, configured to select a target welding wire from a plurality of candidate welding wires, and the chemical components of the target welding wire include C, Mn, Si, P, and S; a welding machine control unit 130, configured to control the welding machine to heat a welding position of two adjacent strip steels and the target welding wire based on the target working parameters, so as to weld the two adjacent strip steels, and the silicon content of each of the two adjacent strip steels is 3.5% - 4.5%.

[0048] It can be understood that the chemical components and their contents of the target welding wire include: C: 0.01% - 0.5%, Mn: 0.1% - 1.0%, Si: 0.01% - 0.1%, P: 0.01% - 0.1%, S: 0.01% - 0.1%.

[0049] It can be understood that the target working parameters include the welding shielding gas pressure, and the welding shielding gas pressure is 5 bar - 10 bar. The target working parameters include the welding speed, and the welding speed is 2.0 m / min - 5.0 m / min. The target working parameters include the welding head pressure, and the welding head pressure is 5 KN - 10 KN. The target working parameters include the heating power, and the heating power is 10 KW - 20 KW. The target working parameters include the clamp gap amount and the wire feeding speed, the clamp gap amount is 0.4 mm - 0.6 mm, and the wire feeding speed is 3 m / min - 5 m / min.

[0050] It can be understood that the welding control device 10 for strip steel further includes: a heating unit, configured to, after controlling the welding machine to heat the welding position of two adjacent strip steels and the target welding wire based on the target working parameters, control the first heating device to heat the welding position after a preset time interval.

[0051] It should be understood that more implementation details of the welding control device 10 for strip steel in the embodiments of the present invention are referred to those described in the foregoing welding control method for strip steel. For the sake of simplicity of the specification, they will not be elaborated herein.

[0052] Based on the same inventive concept, an embodiment of the present invention further provides a welding device, as Figure 4 shown, including a memory 404, a processor 402, and a computer program stored on the memory 404 and executable on the processor 402, and the processor 402 executes the program to implement the steps described in any implementation manner of the embodiment of the welding control method for strip steel.

[0053] Among them, in Figure 4Among them, there is a bus architecture (represented by bus 400). Bus 400 can include any number of interconnected buses and bridges. Bus 400 links together various circuits of one or more processors represented by processor 402 and memory represented by memory 404. Bus 400 can also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and thus will not be further described herein. Bus interface 405 provides an interface between bus 400 and receiver 401 and transmitter 403. Receiver 401 and transmitter 403 can be the same component, i.e., a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 402 is responsible for managing bus 400 and general processing, while memory 404 can be used to store data used by processor 402 when performing operations.

[0054] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. In addition, each functional unit can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0055] In several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units can be a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0056] The units described as separate components may or may not be physically separated. The components serving as control devices may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0057] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0058] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A welding control method for strip steel, characterized in that, Including: Obtaining target working parameters set for the welding machine; Selecting a target welding wire from multiple candidate welding wires, the chemical composition of the target welding wire including C, Mn, Si, P, and S; Based on the target working parameters, controlling the welding machine to heat the welding position of two adjacent strip steels and the target welding wire to weld the two adjacent strip steels, the silicon content of each of the two adjacent strip steels being 3.5% - 4.5%; wherein, the silicon content of the two adjacent strip steels is simultaneously below 3.6%, 3.6 - 3.7%, 3.7 - 3.8%, or above 3.8%.

2. The method for controlling the welding of strip steels according to claim 1, wherein: The chemical composition and its content of the target welding wire include: C: 0.01% - 0.5%, Mn: 0.1% - 1.0%, Si: 0.01% - 0.1%, P: 0.01% - 0.1%, S: 0.01% - 0.1%.

3. The method for controlling the welding of strip steels according to claim 1, wherein: The target working parameters include the welding shielding gas pressure, and the welding shielding gas pressure is 5 bar - 10 bar.

4. The method for controlling the welding of strip steels according to claim 1, wherein: The target working parameters include the welding speed, and the welding speed is 2.0 m / min - 5.0 m / min.

5. The method for controlling the welding of strip steels according to claim 1, wherein: The target working parameters include the welding head pressure, and the welding head pressure is 5 KN - 10 KN.

6. The method for controlling the welding of strip steels according to claim 1, wherein: The target working parameters include the heating power, and the heating power is 10 KW - 20 KW.

7. The method for controlling the welding of strip steels according to claim 1, wherein: The target working parameters include the clamp gap amount and the wire feeding speed, the clamp gap amount is 0.4 mm - 0.6 mm, and the wire feeding speed is 3 m / min - 5 m / min.

8. The welding control method of the strip steel according to claim 1, characterized in that After controlling the welding machine to heat the welding position of two adjacent strip steels and the target welding wire based on the target working parameters, it further includes: After a preset time interval, controlling the first heating device to heat the welding position.

9. A welding control device for strip steel, characterized in that, Including: A parameter acquisition unit for obtaining target working parameters set for the welding machine; A welding wire selection unit for selecting a target welding wire from multiple candidate welding wires, the chemical composition of the target welding wire including C, Mn, Si, P, and S; A welding machine control unit for controlling the welding machine to heat the welding position of two adjacent strip steels and the target welding wire based on the target working parameters to weld the two adjacent strip steels, the silicon content of each of the two adjacent strip steels being 3.5% - 4.5%; wherein, the silicon content of the two adjacent strip steels is simultaneously below 3.6%, 3.6 - 3.7%, 3.7 - 3.8%, or above 3.8%.

10. A welding device, characterized in that, Including: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1-8 when executing the computer program.

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