Method and device for welding of very thin non-oriented silicon steel in a pickling line

Abstract

The application discloses a welding method and device for an acid continuous rolling unit of an ultra-thin non-oriented silicon steel, and the method comprises the following steps: obtaining two pieces of non-oriented silicon steel to be welded and preset working parameters of a laser welding machine, obtaining the thickness of the non-oriented silicon steel, and the preset working parameters of the laser welding machine comprising a preset welding power, wherein the preset welding power is calculated according to the thickness of the non-oriented silicon steel, a preset post-annealing power of a post-annealing process is calculated, the two pieces of non-oriented silicon steel to be welded are centered according to a preset GAP value, the laser welding machine welds the weld of the non-oriented silicon steel according to the preset working parameters, and the weld of the non-oriented silicon steel after welding is post-annealed according to the preset post-annealing power. By controlling the preset welding power, the application avoids the problem of over-melting of the weld.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding method and apparatus for ultra-thin non-oriented silicon steel in a pickling and rolling mill. Background Technology

[0002] Non-oriented silicon steel refers to a silicon-iron alloy with very low carbon content. Its typical thickness is 2.0mm to 3.0mm. When the thickness of non-oriented silicon steel is less than 1.6mm, it is considered to be extremely thin non-oriented silicon steel.

[0003] Currently, non-oriented silicon steel is mainly produced through pickling and rolling. The laser welding machine in the pickling and rolling mill is used to weld non-oriented silicon steel. The minimum thickness of the welding material is 1.6 mm, which is greater than the thickness of ultra-thin non-oriented silicon steel. This makes it difficult for the laser welding machine in the pickling and rolling mill to weld ultra-thin non-oriented silicon steel well. If the existing welding method is used to weld ultra-thin non-oriented silicon steel through the laser welding machine in the pickling and rolling mill, welding failure and poor weld quality are likely to occur. Summary of the Invention

[0004] The embodiments of this application provide a welding method and apparatus for ultra-thin non-oriented silicon steel in a pickling and rolling mill. By improving the welding method, the laser welding machine of the pickling and rolling mill can perform good welding on ultra-thin non-oriented silicon steel.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to a first aspect of the embodiments of this application, a method for welding ultra-thin non-oriented silicon steel in an acid-rolling mill is provided, comprising:

[0007] The preset operating parameters of the laser welding machine and the two pieces of non-oriented silicon steel to be welded are obtained. The thickness of the non-oriented silicon steel is obtained based on the non-oriented silicon steel. The preset operating parameters of the laser welding machine include preset welding power, preset wire feeding speed and preset welding speed. The preset welding power is calculated based on the thickness of the non-oriented silicon steel.

[0008] The preset post-annealing power for the post-annealing process is calculated based on the preset welding speed.

[0009] A preset GAP value is obtained between two pieces of non-oriented silicon steel to be welded. Based on the preset GAP value, the two pieces of non-oriented silicon steel to be welded are aligned. After alignment, the weld seam of the non-oriented silicon steel is rolled by a front rolling roller. The laser welding machine welds the non-oriented silicon steel according to preset working parameters. The weld seam of the non-oriented silicon steel is then post-annealed according to a preset post-annealing power. After annealing, the weld seam of the non-oriented silicon steel is rolled by a rear rolling roller. The pressure of the front rolling roller is less than the pressure of the rear rolling roller.

[0010] In some embodiments of this application, based on the foregoing scheme, the preset welding power is proportional to the thickness of the non-oriented silicon steel.

[0011] In some embodiments of this application, based on the foregoing scheme, the preset welding speed is obtained in the following manner:

[0012] Obtain the preset wire feeding speed, and calculate the preset welding speed based on the preset wire feeding speed.

[0013] In some embodiments of this application, based on the aforementioned scheme, the preset welding speed and the preset wire feeding speed are proportional.

[0014] In some embodiments of this application, based on the foregoing scheme, the preset post-annealing power and the preset welding speed are proportional.

[0015] In some embodiments of this application, based on the foregoing scheme, the preset GAP value is obtained in the following manner:

[0016] Obtain the roughness of the weld end face, and calculate the preset GAP value based on the roughness of the weld end face.

[0017] In some embodiments of this application, based on the aforementioned scheme, the preset GAP value is inversely proportional to the roughness of the weld end face.

[0018] In some embodiments of this application, based on the foregoing scheme, the preset operating parameters of the laser welding machine also include a preset wire feeding acceleration rate and a preset upper limit value for wire feeding speed.

[0019] In some embodiments of this application, based on the foregoing scheme, the wire feeding method of the laser welding machine is as follows:

[0020] The wire is fed at a preset wire feeding speed value, and the wire feeding speed is accelerated according to a preset wire feeding acceleration rate.

[0021] When the wire feeding speed reaches the preset upper limit, the acceleration of the wire feeding speed is stopped, and wire is fed at the preset upper limit.

[0022] In some embodiments of this application, based on the aforementioned scheme, the laser welding machine uses low-silicon, high-manganese welding wire for welding.

[0023] In some embodiments of this application, by controlling the preset welding power, when the laser welding machine welds ultra-thin non-oriented silicon steel, the problem of over-melting of the weld is avoided. The post-annealing power is controlled so that the post-annealing power matches the preset welding speed, thereby improving the heat preservation ability of post-weld annealing, allowing the stress near the weld of the non-oriented silicon steel to be fully released, and eliminating the problem of stress concentration in the weld area.

[0024] According to a second aspect of the embodiments of this application, a welding apparatus for ultra-thin non-oriented silicon steel in an acid-rolling mill is provided, comprising:

[0025] The acquisition unit acquires the two pieces of non-oriented silicon steel to be welded and the preset working parameters of the laser welding machine. Based on the non-oriented silicon steel, the thickness of the non-oriented silicon steel is obtained. The preset working parameters of the laser welding machine include preset welding power, preset wire feeding speed and preset welding speed. The preset welding power is calculated based on the thickness of the non-oriented silicon steel.

[0026] The calculation unit calculates the preset post-annealing power for the post-annealing process based on the preset welding speed.

[0027] The welding unit obtains the preset GAP value between two pieces of non-oriented silicon steel to be welded. Based on the preset GAP value, the two pieces of non-oriented silicon steel to be welded are aligned. After alignment, the weld seam of the non-oriented silicon steel is rolled by a front rolling roller. The laser welding machine welds the non-oriented silicon steel according to preset working parameters. The welded non-oriented silicon steel weld seam is then post-annealed according to a preset post-annealing power. After annealing, the weld seam of the non-oriented silicon steel is rolled by a rear rolling roller. The pressure of the front rolling roller is less than the pressure of the rear rolling roller.

[0028] The beneficial effects of the various embodiments of the second aspect described above can be referred to the beneficial effects of the first aspect and the various embodiments of the first aspect described above, and will not be repeated here.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0031] Figure 1 A flowchart illustrating the welding method for ultra-thin non-oriented silicon steel in an acid continuous rolling mill according to an embodiment of this application is shown;

[0032] Figure 2 A block diagram of the welding method apparatus for ultra-thin non-oriented silicon steel in an acid continuous rolling mill according to an embodiment of this application is shown. Detailed Implementation

[0033] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0034] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0035] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0036] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0037] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0039] Figure 1 A flowchart of a welding method for ultra-thin non-oriented silicon steel in an acid continuous rolling mill according to an embodiment of this application is shown. This welding method for ultra-thin non-oriented silicon steel in an acid continuous rolling mill can be performed by a device with computational processing capabilities.

[0040] Reference Figure 1 As shown, the welding method for ultra-thin non-oriented silicon steel in this acid continuous rolling mill includes at least steps S1 to S3, which are described in detail below:

[0041] In step S1, the preset operating parameters of the two non-oriented silicon steels to be welded and the laser welding machine are obtained. The thickness of the non-oriented silicon steel is obtained based on the non-oriented silicon steel. The preset operating parameters of the laser welding machine include preset welding power, preset wire feeding speed and preset welding speed. The preset welding power is calculated based on the thickness of the non-oriented silicon steel.

[0042] In this application, when the thickness of the non-oriented silicon steel is relatively thin, such as less than 1.6 mm, the preset welding power of the laser welding machine can be adjusted so that the thickness of the non-oriented silicon steel matches the preset welding power of the laser welding machine, thereby avoiding the problem of over-melting of the weld.

[0043] In step S2, the preset post-annealing power for the post-annealing process is calculated based on the preset welding speed.

[0044] In this application, controlling the post-annealing power to match the preset welding speed can improve the heat preservation ability of post-annealing, fully release the stress near the non-oriented silicon steel weld, eliminate the stress concentration problem in the weld area, and the post-annealing process can heat the weld based on the principle of electromagnetic induction.

[0045] In step S3, a preset GAP value between the two non-oriented silicon steel pieces to be welded is obtained. Based on the preset GAP value, the two non-oriented silicon steel pieces to be welded are aligned. After alignment, the weld seam of the non-oriented silicon steel is rolled by a front rolling roller. The laser welding machine welds the non-oriented silicon steel according to preset working parameters. The welded non-oriented silicon steel weld seam is then post-annealed according to a preset post-annealing power. After annealing, the weld seam of the non-oriented silicon steel is rolled by a rear rolling roller. The pressure of the front rolling roller is less than the pressure of the rear rolling roller.

[0046] In this application, GAP value is the gap between two pieces of non-oriented silicon steel. A negative gap principle can be adopted, that is, the GAP value is negative. The smaller the GAP value, the more likely the burrs on the welding end face are to be flattened, thereby reducing the impact of the burrs on the weld. The front rolling roller rolls the weld before welding to reduce or eliminate the edge waviness of the non-oriented silicon steel and flatten the weld before welding. The rear rolling roller rolls the weld after post-annealing to make the weld smoother.

[0047] The pressure of the front rolling roller is matched with the deformation of the non-oriented silicon steel, and the pressure of the rear rolling roller is matched with the deformation of the weld, so as to avoid severe deformation of the non-oriented silicon steel and the weld. The pressure of the front rolling roller can be 9.8 to 10.2 KN, for example 10 KN, and the pressure of the rear rolling roller can be 13.8 to 14.2 KN, for example 14 KN.

[0048] In this application, the preset welding power is proportional to the thickness of the non-oriented silicon steel.

[0049] Specifically, the thinner the non-oriented silicon steel, the lower the preset welding power. For example, when the thickness of the non-oriented silicon steel is less than 1.1 mm, the preset welding power needs to be reduced to 7 kW, thereby solving the problem of over-melting of the weld.

[0050] In this application, the preset welding speed is obtained in the following manner:

[0051] Obtain the preset wire feeding speed, and calculate the preset welding speed based on the preset wire feeding speed.

[0052] Specifically, the preset welding speed and the preset wire feeding speed are directly proportional. The faster the preset wire feeding speed, the faster the preset welding speed should be to avoid feeding too much or too little wire, which would affect the weld quality. Preferably, the wire feeding amount is controlled at 30% to 40% of the weld volume, so that the welding wire can dilute the silicon element in the weld and the weld has good plasticity. The wire feeding amount is determined by the cross-sectional area of ​​the welding wire and the preset wire feeding speed. When the cross-sectional area of ​​the welding wire is fixed, the wire feeding amount can be adjusted by adjusting the preset wire feeding speed.

[0053] The preset wire feed speed and preset welding speed need to be set to match. If they do not match, the welding wire cannot effectively dilute the silicon element in the weld, resulting in poor weld plasticity.

[0054] In this application, the preset post-annealing power is proportional to the preset welding speed.

[0055] Specifically, the higher the preset welding speed, the higher the preset post-annealing power should be. The two need to be matched. When they are not matched, the residual stress in the weld area is large, and the weld is prone to cracking during the rolling process. When the post-annealing voltage remains unchanged, the preset post-annealing power can be achieved by adjusting the post-annealing current. For example, the post-annealing current can be adjusted to 135A (the maximum post-annealing current is 180A, which corresponds to a post-annealing power of 40kW) to improve the heat preservation capacity of post-weld annealing, so that the stress near the weld of non-oriented silicon steel can be fully released and the stress concentration problem in the weld area can be eliminated.

[0056] In this application, the preset GAP value is obtained in the following manner:

[0057] Obtain the roughness of the weld end face, and calculate the preset GAP value based on the roughness of the weld end face.

[0058] Specifically, the roughness of the weld end face characterizes the quality of the weld end face. The preset GAP value is inversely proportional to the roughness of the weld end face, and the two need to be set in a matching manner. When the two are not matched, the burrs on the weld end face will cause porosity defects inside the weld, resulting in a decrease in weld strength.

[0059] In this application, the preset operating parameters of the laser welding machine also include a preset wire feeding acceleration rate and a preset upper limit value for wire feeding speed.

[0060] Specifically, the wire feeding method of the laser welding machine is as follows:

[0061] The wire is fed at a preset wire feeding speed value, and the wire feeding speed is accelerated according to a preset wire feeding acceleration rate.

[0062] When the wire feeding speed reaches the preset upper limit, the acceleration of the wire feeding speed is stopped, and wire is fed at the preset upper limit.

[0063] The preset wire feeding speed can be from 4 m / min to 6 m / min, the preset wire feeding acceleration rate is from 3.9% to 4.1%, and the preset upper limit of the wire feeding speed is from 5.9 m / min to 6.1 m / min. For example, if the preset wire feeding speed is 4 m / min, the preset wire feeding acceleration rate is 4%, and the preset upper limit of the wire feeding speed is 6 m / min, the laser welding machine first feeds the wire at a wire feeding speed of 4 m / min, then accelerates it according to the preset wire feeding acceleration rate of 4%. When the wire feeding speed reaches 6 m / min, the acceleration stops, and the laser welding machine feeds the wire at a wire feeding speed of 6 m / min. Through the above wire feeding method, the quality of the weld at the welding end can be improved. The acceleration and maintenance of the wire feeding speed can be accomplished by a frequency converter motor.

[0064] Therefore, it can be seen that the laser welding machine can feed wire at a fixed speed according to the preset wire feeding speed value, or it can use the above-mentioned wire feeding method.

[0065] In this application, the laser welding machine uses low-silicon, high-manganese welding wire for welding. Specifically, since silicon steel has a high silicon content, which is not conducive to welding, the welding wire has a low silicon content, which can dilute the silicon content, and a high manganese content, which is conducive to the formation of fulminate, resulting in higher strength and better toughness.

[0066] Before obtaining the two pieces of non-oriented silicon steel to be welded, the non-oriented silicon steel is sheared using the shear blade of the laser welding machine to make the cut of the non-oriented silicon steel relatively flat, which facilitates the welding of the non-oriented silicon steel. In order to reduce the burrs on the cut and eliminate the influence of shear burrs on the welding quality, and to ensure that the weld is full, free of porosity and inclusions, the shear blade gap value of the laser welding machine can be reduced. The shear blade gap value can be reduced by increasing the pressure of the strip clamping device.

[0067] In summary, by matching the preset welding power and the thickness of the non-oriented silicon steel, overmelting of the weld is avoided. Matching the preset wire feeding speed and welding speed ensures the welding wire dilutes the silicon in the weld, resulting in good weld plasticity. Matching the preset GAP value and weld face roughness prevents burrs on the weld face from causing porosity defects and reducing weld strength. Matching the preset post-annealing power and welding speed avoids excessive residual stress in the weld area, which can easily lead to weld cracking during rolling. Matching the pressure of the front rolling roller and the non-oriented silicon steel thickness also contributes to this. The deformation of silicon steel, the pressure of the rear rolling roller, and the deformation of the weld are controlled to avoid severe deformation of the non-oriented silicon steel and the weld. Then, the two pieces of non-oriented silicon steel are clamped according to the pre-matched preset GAP value. The front rolling roller rolls the weld before welding according to the pre-matched pressure. The laser welding machine performs welding with the pre-matched preset welding power, preset wire feeding speed, and preset welding speed. After that, the weld is post-annealed according to the preset post-annealing power. The rear rolling roller rolls the post-annealed weld according to the pre-matched pressure, thereby obtaining a weld with high plasticity and no internal defects.

[0068] Figure 2 A block diagram of the welding apparatus for ultra-thin non-oriented silicon steel in an acid continuous rolling mill according to an embodiment of this application is shown.

[0069] like Figure 2 As shown, based on the same inventive concept, the second aspect of this application also provides a welding apparatus 100 for ultra-thin non-oriented silicon steel in an acid continuous rolling mill, comprising:

[0070] The acquisition unit 101 acquires the two pieces of non-oriented silicon steel to be welded and the preset working parameters of the laser welding machine. Based on the non-oriented silicon steel, the thickness of the non-oriented silicon steel is obtained. The preset working parameters of the laser welding machine include preset welding power, preset wire feeding speed and preset welding speed. The preset welding power is calculated based on the thickness of the non-oriented silicon steel.

[0071] The calculation unit 102 calculates the preset post-annealing power for the post-annealing process based on the preset welding speed.

[0072] Welding unit 103 obtains the preset GAP value between two pieces of non-oriented silicon steel to be welded. Based on the preset GAP value, the two pieces of non-oriented silicon steel to be welded are aligned. After alignment, the weld seam of the non-oriented silicon steel is rolled by a front rolling roller. The laser welding machine welds the non-oriented silicon steel according to preset working parameters. The welded non-oriented silicon steel weld seam is post-annealed according to a preset post-annealing power. After annealing, the weld seam of the non-oriented silicon steel is rolled by a rear rolling roller. The pressure of the front rolling roller is less than the pressure of the rear rolling roller.

[0073] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0074] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A welding method for ultra-thin non-oriented silicon steel in a pickling and rolling mill, characterized in that, include: The preset operating parameters of the laser welding machine and the two pieces of non-oriented silicon steel to be welded are obtained. The thickness of the non-oriented silicon steel is obtained based on the non-oriented silicon steel. The preset operating parameters of the laser welding machine include preset welding power, preset wire feeding speed and preset welding speed. The preset welding power is calculated based on the thickness of the non-oriented silicon steel. Based on the preset welding speed, the preset post-annealing power for the post-annealing process is calculated, and the preset post-annealing power is proportional to the preset welding speed. A preset GAP value is obtained between two pieces of non-oriented silicon steel to be welded. Based on the preset GAP value, the two pieces of non-oriented silicon steel to be welded are aligned. After alignment, the weld seam of the non-oriented silicon steel is rolled by a front rolling roller. The laser welding machine welds the non-oriented silicon steel according to preset working parameters. The weld seam of the non-oriented silicon steel is then post-annealed according to a preset post-annealing power. After annealing, the weld seam of the non-oriented silicon steel is rolled by a rear rolling roller. The pressure of the front rolling roller is less than the pressure of the rear rolling roller.

2. The method according to claim 1, characterized in that, The preset welding power is proportional to the thickness of the non-oriented silicon steel.

3. The method according to claim 1, characterized in that, The preset welding speed is obtained in the following way: Obtain the preset wire feeding speed, and calculate the preset welding speed based on the preset wire feeding speed.

4. The method according to claim 3, characterized in that, The preset welding speed is proportional to the preset wire feeding speed.

5. The method according to claim 1, characterized in that, The preset GAP value is obtained in the following way: Obtain the roughness of the weld end face, and calculate the preset GAP value based on the roughness of the weld end face.

6. The method according to claim 1, characterized in that, The preset GAP value is inversely proportional to the roughness of the welded end face.

7. The method according to claim 1, characterized in that, The preset operating parameters of the laser welding machine also include a preset wire feeding acceleration rate and a preset upper limit value for wire feeding speed. The wire feeding method of the laser welding machine is as follows: The wire is fed at a preset wire feeding speed, and the wire feeding speed is accelerated according to a preset wire feeding acceleration rate. When the wire feeding speed reaches the preset upper limit, the acceleration of the wire feeding speed is stopped, and wire is fed at the preset upper limit.

8. The method according to claim 1, characterized in that, The laser welding machine uses low-silicon, high-manganese welding wire for welding.

9. A welding device for ultra-thin non-oriented silicon steel in a pickling and rolling mill, characterized in that, include: The acquisition unit acquires the two pieces of non-oriented silicon steel to be welded and the preset working parameters of the laser welding machine. Based on the non-oriented silicon steel, the thickness of the non-oriented silicon steel is obtained. The preset working parameters of the laser welding machine include preset welding power, preset wire feeding speed and preset welding speed. The preset welding power is calculated based on the thickness of the non-oriented silicon steel. The calculation unit calculates the preset post-annealing power for the post-annealing process based on the preset welding speed, and the preset post-annealing power is proportional to the preset welding speed. The welding unit obtains the preset GAP value between two pieces of non-oriented silicon steel to be welded. Based on the preset GAP value, the two pieces of non-oriented silicon steel to be welded are aligned. After alignment, the weld seam of the non-oriented silicon steel is rolled by a front rolling roller. The laser welding machine welds the non-oriented silicon steel according to preset working parameters. The welded non-oriented silicon steel weld seam is then post-annealed according to a preset post-annealing power. After annealing, the weld seam of the non-oriented silicon steel is rolled by a rear rolling roller. The pressure of the front rolling roller is less than the pressure of the rear rolling roller.

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