A steel coil welding method, system, medium and computer device in an acid continuous rolling production line

Abstract

The application discloses a steel coil welding method, system, medium and computer equipment in an acid continuous rolling production line, which comprises the following steps: taking the first weld welded by fixing the initial wire feeding speed throughout the whole process as a reference, obtaining the excess height change curve of the welding direction, cutting off the first weld and constructing a second weld under the premise of keeping the welding and plate parameters consistent, determining the dynamic speed increasing starting position of the welding wire based on the excess height change curve, combining the actual excess height of the position, the initial wire feeding speed and the preset target excess height to calculate the dynamic speed increasing adjustment target value and the adjustment amount, and finally controlling the wire feeding speed to gradually increase from the initial value to the target value and keep to the end of the welding when the second weld is welded to the starting position.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology in continuous strip steel production lines, and more particularly to a method, system, medium, and computer equipment for welding steel coils in a continuous pickling and rolling production line. Background Technology

[0002] In a continuous pickling and rolling production line, the continuous connection of steel coils is the core link to ensure the efficient and stable operation of the unit. Its core technology lies in reliably welding the tail of the previous steel coil to the head of the next steel coil, thereby realizing continuous operation throughout the entire process.

[0003] Traditional strip steel welding processes primarily utilize narrow lap welding machines. However, these processes suffer from inherent drawbacks such as low welding efficiency, wide heat-affected zones, and significant welding deformation, making them unsuitable for the demands of high-speed continuous rolling production lines. Furthermore, the weld quality is unstable, easily leading to cracking and strip breakage during subsequent rolling and annealing processes. With advancements in material processing and automation technologies, laser welding, with its significant advantages of high welding efficiency, narrow welds, small heat-affected zones, and ease of automation, is gradually replacing traditional welding processes and is widely used in various continuous strip steel welding scenarios, becoming the mainstream welding technology in the current field of continuous strip steel production.

[0004] Weld quality directly determines the stability of subsequent rolling processes and the final product qualification rate. Among these, penetration rate, weld width, undercut, and weld reinforcement are core indicators for evaluating weld quality. Weld reinforcement, as a key parameter directly affecting weld connection strength, requires particularly careful consistency control. Weld reinforcement refers to the height of the metal protrusion on the weld surface above the surface of the base strip after welding. A reasonable reinforcement dimension ensures effective metallurgical bonding between the weld and the base material, guaranteeing the load-bearing capacity and fatigue resistance of the weld area. Insufficient reinforcement, a typical "incomplete weld" defect, significantly reduces the actual stress-bearing area of ​​the weld, failing to meet the design stress requirements of the production line. This can easily lead to crack propagation due to stress concentration during subsequent rolling, ultimately causing strip breakage accidents, severely impacting unit production efficiency and significantly restricting capacity expansion.

[0005] A schematic diagram of continuous strip welding is shown below. Figure 1As shown, the welding area is divided into two key sections along the width of the strip: the drive side and the operating side. The drive side is the power transmission side of the strip continuous rolling production line, adjacent to the transmission mechanism and guide roller system of the unit; the operating side is the personnel monitoring and equipment adjustment side, with ample space. In the drive side weld area, heat can only be naturally conducted to the air through thermal radiation and convection, leading to continuous heat accumulation during welding. This heat accumulation can cause localized warping and deformation of the strip, thereby compromising the stability of the butt joint gap and making it difficult for the welding filler material to fully fill the weld gap, ultimately resulting in insufficient weld reinforcement on the drive side. In contrast, the operating side weld area has excellent heat dissipation conditions, allowing heat to dissipate rapidly, resulting in less strip deformation, a stable butt joint gap, and weld reinforcement that meets quality standards.

[0006] Currently, most quality control solutions for strip welding in the industry adopt uniform welding parameters across the entire width, without differentiated control for defects such as insufficient weld reinforcement, thus failing to effectively address the technical pain point of insufficient weld reinforcement. Summary of the Invention

[0007] To address or partially address the technical problem of not differentiating and controlling the defects of insufficient residual height, this invention provides a method, system, medium, and computer equipment for welding steel coils in a continuous acid rolling production line.

[0008] To address the aforementioned technical problems, a first aspect of the present invention discloses a method for welding steel coils in a continuous acid rolling production line, the method comprising: After the first weld is completed, the reinforcement height variation curve of the first weld in the welding direction is obtained; wherein, the first weld is the weld formed by the initial tail of the first steel coil and the initial head of the second steel coil, and the first weld is welded at a preset initial wire feeding speed throughout the process; the reinforcement height variation curve is the curve formed by the actual welding reinforcement height of each welding monitoring position in the welding direction of the first weld. The first weld is removed and a second weld is constructed; wherein, the second weld is formed by the new strip tail of the first steel coil and the new strip head of the second steel coil after the first weld is removed; the welding parameters of the first weld and the second weld are the same except for the wire feed speed, and the plate parameters corresponding to the first weld and the second weld are the same; The starting position of the dynamic speed increase of the welding wire is determined based on the actual welding height at each welding monitoring position. Based on the actual welding height at the starting position of the welding wire dynamic speed-up, the initial wire feeding speed, and the preset target height value, the target value for adjusting the welding wire dynamic speed-up of the second weld is determined. The adjustment amount of the dynamic speed increase of the welding wire for the second weld is determined by referring to the initial wire feeding speed and the target value of the dynamic speed increase adjustment of the welding wire. During the welding process of the second weld, welding is started at the initial wire feeding speed. When welding reaches the starting position of the dynamic speed increase of the welding wire, the wire feeding speed of the welding machine is controlled to gradually increase from the initial wire feeding speed according to the adjustment amount of the dynamic speed increase of the welding wire to the target value of the dynamic speed increase of the welding wire, and the target value of the dynamic speed increase of the welding wire is maintained until the welding of the second weld is completed.

[0009] Optionally, determining the starting position of the dynamic speed increase of the welding wire based on the actual welding reinforcement height at each welding monitoring position specifically includes: Determine the difference in actual weld height relative to the preset target weld height value at each welding monitoring position; Determine whether the residual height difference at each welding monitoring position meets the preset condition: △h i >k1×t; where, △h i t is the residual height difference at the i-th welding monitoring position, t is the plate thickness of the initial strip tail of the first steel coil or the initial strip head of the second steel coil, and k1 is the first proportional coefficient. The first welding monitoring position where the residual height difference meets the preset condition is taken as the starting position of the dynamic speed increase of the welding wire.

[0010] Optionally, the first proportionality coefficient k1 = 0.1.

[0011] Optionally, determining the target value for adjusting the dynamic speed increase of the welding wire in the second weld seam based on the actual welding height at the starting position of the dynamic speed increase of the welding wire, the initial wire feed speed, and the preset target height value specifically includes: Substitute the actual welding height at the starting position of the dynamic increase in welding wire speed, the initial wire feed speed, and the preset target welding height value into the wire feed speed calculation formula. Determine the target value for adjusting the dynamic speed increase of the welding wire; Where v represents the target value for the dynamic speed increase adjustment of the welding wire. n This represents the correction factor. v 0 represents the initial wire feeding speed. h Indicates the target weld reinforcement. h 0 indicates the actual welding height at the starting position of the welding wire dynamic speed increase.

[0012] Optionally, determining the adjustment amount of the dynamic speed increase of the welding wire for the second weld, by referring to the initial wire feed speed and the target value for the dynamic speed increase adjustment of the welding wire, specifically includes: according to By processing the initial wire feed speed and the target value for the dynamic speed increase adjustment of the welding wire, the adjustment amount of the dynamic speed increase of the welding wire is obtained. Where k2 represents the second proportionality coefficient, k3 represents the third proportionality coefficient, and k2 < k3.

[0013] Optional, k2=0.2, k3=0.4.

[0014] Optionally, the welding parameters other than wire feeding speed include: welding speed, welding power, preheating power, and annealing power; the plate parameters include: plate width on both sides of the weld, plate thickness on both sides of the weld, plate shearing accuracy, and weld butt gap.

[0015] A second aspect of the present invention discloses a steel coil welding system in a continuous acid rolling production line, comprising: The module is used to obtain the reinforcement height variation curve of the first weld in the welding direction after the first weld is completed; wherein, the first weld is the weld formed by the initial tail of the first steel coil and the initial head of the second steel coil, and the first weld is welded at a preset initial wire feeding speed throughout the process; the reinforcement height variation curve is the curve formed by the actual welding reinforcement height of each welding monitoring position in the welding direction of the first weld. The cutting module is used to cut off the first weld and construct the second weld; wherein, the second weld is formed by the new strip tail of the first steel coil and the new strip head of the second steel coil after the first weld is cut off; the welding parameters of the first weld and the second weld are the same except for the wire feeding speed, and the plate parameters corresponding to the first weld and the second weld are the same; The first determining module is used to determine the starting position of the dynamic speed increase of the welding wire based on the actual welding height at each welding monitoring position. The second determining module is used to determine the target value for adjusting the dynamic speed increase of the welding wire in the second weld seam based on the actual welding height at the starting position of the dynamic speed increase of the welding wire, the initial wire feeding speed, and the preset target height value. The third determining module is used to determine the amount of dynamic speed increase adjustment of the welding wire for the second weld by referring to the initial wire feeding speed and the target value of the dynamic speed increase adjustment of the welding wire. The welding control module is used to start welding at the initial wire feeding speed during the welding process of the second weld. When welding reaches the starting position of the dynamic speed increase of the welding wire, the module controls the wire feeding speed of the welding machine to gradually increase from the initial wire feeding speed according to the adjustment amount of the dynamic speed increase of the welding wire to the target value of the dynamic speed increase of the welding wire, and maintains the target value of the dynamic speed increase of the welding wire until the welding of the second weld is completed.

[0016] A third aspect of the present invention discloses a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the above-described method.

[0017] A fourth aspect of the present invention discloses a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method.

[0018] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages: The technical solution of this invention uses a first weld seam welded at a fixed initial wire feed speed throughout the entire process as a benchmark to obtain the weld reinforcement height variation curve in its welding direction. While maintaining consistent welding and plate parameters, the first weld seam is removed and a second weld seam is constructed. Based on the weld reinforcement height variation curve, the starting position of the dynamic increase in wire speed is determined. Combining the actual weld reinforcement height at this position, the initial wire feed speed, and the preset target weld reinforcement height, the target value and adjustment amount for dynamic speed increase adjustment are calculated. Finally, when the second weld seam reaches the starting position, the wire feed speed is controlled to gradually increase from the initial value to the target value and maintained until the welding is completed. This solution uses targeted dynamic adjustment of the wire feed speed to differentiate and control the defect of insufficient weld reinforcement height, thereby accurately compensating for the gap changes caused by heat accumulation on the drive side. This significantly improves the consistency of the weld reinforcement height after welding, achieving a weld reinforcement height qualification rate of over 95% for the material. This greatly reduces the risk of strip breakage in subsequent rolling processes, significantly improves product yield, and maintains the simplicity and economy of the welding process, adapting to the high-efficiency and stable operation requirements of high-speed continuous rolling production lines.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of welding in the prior art is shown; Figure 2 A flowchart of a steel coil welding method in a continuous acid rolling production line according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of the residual height variation curve according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of a steel coil welding system in a continuous acid rolling production line according to an embodiment of the present invention is shown. Detailed Implementation

[0021] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0022] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0023] Firstly, such as Figure 2 As shown in the embodiment of the present invention, a steel coil welding method in a continuous acid rolling production line solves the problem of insufficient weld reinforcement caused by heat deformation of the plate at the tail end of the weld (i.e., the drive side) by dynamically controlling the wire feeding speed, thereby improving product yield. The method includes at least the following steps: S201, after the first weld is completed, obtain the curve of the residual height change of the first weld in the welding direction.

[0024] The first weld is formed by the initial tail of the first steel coil and the initial head of the second steel coil. The plate material of the first weld refers to the initial tail of the first steel coil and the initial head of the second steel coil on both sides of the weld. The plate material parameters of the first weld include: the plate width on both sides of the first weld, the plate thickness on both sides of the first weld, the plate shearing accuracy of the first weld, and the weld butt joint gap of the first weld. It is worth noting that the plate width, plate thickness, and plate shearing accuracy on both sides of the first weld are all consistent.

[0025] For example, the width of the plate on both sides of the first weld is 800mm to 2000mm, for example, it can be 835mm, 960mm, 1080mm, 1180mm, 1255mm, 1340mm, or 1550mm, but this is not a limitation.

[0026] For example, the thickness of the plate on both sides of the first weld is 1.2mm to 5mm. For example, it can be 1.8mm, 2.0mm, 2.3mm, 2.5mm, 2.8mm, 3.0mm, 4.5mm, or 5mm, but this is not a limitation.

[0027] Specifically, two steel coils are cut using mechanical shears or lasers, and then the initial head of the first steel coil and the initial tail of the second steel coil are fixed and clamped on a fixture according to a preset gap to form the first weld.

[0028] When welding the first weld, the welding machine is controlled to weld from the operating side to the driving side, and the welding direction of the first weld is from the operating side to the driving side, such as... Figure 1 As shown. The welding parameters for the first weld include: wire feed speed, welding speed, welding power, preheating power, and annealing power.

[0029] After the first weld is completed, the excess height distribution of the first weld in the welding direction is monitored throughout the entire range to obtain the excess height variation curve of the first weld in the welding direction.

[0030] For example, the first weld has several welding monitoring positions. The number and relative positions of these monitoring positions can be set according to actual conditions. A laser vision morphology detector can be used to observe the welding morphology of the first weld. The laser scans the weld surface to collect real-time three-dimensional morphology data for each monitoring position. After data processing, the actual weld height at each monitoring position is extracted, and a linear interpolation fitting algorithm is used to obtain the weld height variation curve. The weld height variation curve is formed by the combined actual weld heights of several continuous detection points (i.e., each welding monitoring position) along the welding direction of the first weld, representing the variation law of the weld height. For example, along the first weld from start to finish, an actual weld height value is monitored every 10 mm. The actual weld heights of all monitoring points are arranged in positional order to form the weld height variation curve, reflecting the trend of weld height variation from head to tail.

[0031] See Figure 3 , is a schematic diagram of the curve of the change of residual height.

[0032] In the weld reinforcement variation curve, the horizontal axis represents the weld length of the first weld: 0mm~500mm, where 0mm corresponds to the welding start point on the operating side and 500mm corresponds to the welding end point on the driving side. The vertical axis represents the weld reinforcement value (unit: mm), assuming a preset target reinforcement value of 1.2mm. The welding direction is from the operating side to the driving side.

[0033] In the 0m~400mm section: the excess height remained stable at 1.2mm with no significant attenuation. Corresponding to the area from the operating side to the middle of the weld, the heat dissipation conditions were good, and the strip deformation was small. The excess height in this section was stable and met the target requirements. In the 400m~500mm section: the excess height continuously decreased from 1.2mm to 0.9mm. Specifically, it began to decrease continuously after 400mm. At 425mm, the measured excess height was 1.1mm, with a difference of nearly 0.1t, which was about to exceed the standard. At 450mm, the measured excess height was 1.0mm, with a difference of 0.1t, reaching the threshold of exceeding the standard. At 500mm (the tail end), the measured excess height was 0.9mm, with a difference far exceeding 0.1t, indicating a serious deficiency in excess height. It can be seen that the 400m~500mm section exhibits a tail-end attenuation pattern. Corresponding to the driving side area, heat accumulation caused strip deformation, and the increased butt joint gap led to insufficient excess height. The weld seam on the drive side ends at 500mm, with a residual height of 0.9mm, which is the lowest value throughout the entire weld.

[0034] The first weld was welded using a preset initial wire feed speed, which remained constant throughout the entire welding process. However, due to the differences between the operating side and the driving side, insufficient weld reinforcement was a common problem when welding on the driving side.

[0035] To address the issue of insufficient weld reinforcement and improve the weld yield between two steel coils, the wire feed speed of the welding wire used for welding between the two steel coils (i.e., welding the second weld) is readjusted by referring to the reinforcement variation curve. All other welding parameters remain unchanged. By adjusting the wire feed speed, the defect of unstable weld gap caused by heat accumulation deformation is compensated, ensuring that the welding filler material fully fills the weld and that the reinforcement of the second weld meets the quality standard requirements.

[0036] S202, cut off the first weld and construct the second weld.

[0037] The second weld is formed by the new strip tail of the first steel coil and the new strip head of the second steel coil after the first weld is removed.

[0038] Specifically, the first weld has a defect of insufficient weld reinforcement, so the finished weld does not meet the welding requirements. In order to solve the problem of insufficient weld reinforcement and improve the welding yield between the two steel coils, the first weld that does not meet the welding requirements is cut off, and a new strip tail of the first steel coil and a new strip head of the second steel coil are obtained. Then, the second weld is formed again according to the preset gap.

[0039] To ensure that the welding of the second weld can be adjusted entirely based on the reinforcement height variation curve of the first weld, the plate parameters corresponding to the first and second welds must be identical. That is, the plate width, plate thickness, plate shearing accuracy, and weld butt joint gap on both sides of the weld must be exactly the same. This eliminates the interference of plate and assembly differences on the weld reinforcement height, ensuring that the reinforcement height variation of the first weld is only caused by strip deformation due to heat accumulation. This allows the wire feed speed adjusted based on the actual welding reinforcement height of the first weld to accurately adapt to the welding scenario of the second weld, effectively solving the problem of insufficient weld reinforcement height. Furthermore, the welding parameters of the first and second welds are identical except for the wire feed speed. That is, except for the wire feed speed, the welding speed, welding power, preheating power, and annealing power involved in welding the first and second welds are exactly the same.

[0040] S203, determine the starting position of the dynamic speed increase of the welding wire based on the actual welding height at each welding monitoring position.

[0041] Specifically, the variation pattern of the weld height of the first weld can be seen from the actual weld height at each welding monitoring position, such as the position of the decrease in the weld height at the tail of the first weld (the position of the decrease can determine the starting position of the dynamic speed increase of the welding wire), the magnitude of the decrease (which can adjust the wire feeding speed), etc. The subsequent second weld can directly reuse this pattern to adjust the starting position of the dynamic speed increase of the welding wire and the wire feeding speed, thereby improving the welding accuracy.

[0042] In the specific implementation process, the difference between the welding height of each welding monitoring position and the preset target height value is first determined.

[0043] Taking the actual weld height at the i-th welding monitoring position as an example, the difference in weld height Δh at the i-th welding monitoring position can be obtained by subtracting the preset target weld height value from the actual weld height at the i-th welding monitoring position. i Determine whether the residual height difference at each welding monitoring position meets the preset condition: △h i >k1×t; where, △h i Let t be the residual height difference at the i-th welding monitoring position, t be the plate thickness of the initial tail of the first steel coil or the initial head of the second steel coil, and k1 be the first proportional coefficient. For example, the proportional coefficient k1 = 0.1, but this is not a limitation. The first welding monitoring position where the residual height difference satisfies the preset condition is taken as the starting position of the dynamic speed increase of the welding wire.

[0044] When the actual weld reinforcement at a certain welding monitoring point is lower than the preset target reinforcement value, and the reduction in the reinforcement difference exceeds 10% of the plate thickness t, it indicates that the defect of insufficient weld reinforcement at the welding monitoring point has affected the plate quality, and the wire feed speed adjustment must be initiated. Therefore, this welding monitoring point is designated as the starting position for the dynamic increase in wire feed speed. For example, referring to the reinforcement change curve, 450mm is set as the starting position for the dynamic increase in wire feed speed for the second weld; that is, when the second weld reaches 450mm, the wire feed speed increase is initiated.

[0045] S204. Based on the actual welding height, initial wire feeding speed and preset target height value of each welding monitoring position, determine the target value for adjusting the dynamic speed increase of the welding wire in the second weld.

[0046] Substitute the actual welding height at the starting position of the dynamic increase in welding wire speed, the initial wire feed speed, and the preset target welding height value into the wire feed speed calculation formula. The target value for adjusting the dynamic speed increase of the welding wire is determined.

[0047] in, v This indicates the target value for the dynamic speed increase adjustment of the welding wire. n This represents the correction factor, 1 in the example. v 0 indicates the initial wire feeding speed, which is pre-calibrated based on the strip material, thickness, welding power, etc. h Indicates the target weld reinforcement. h 0 indicates the actual welding height at the starting position of the welding wire dynamic speed increase.

[0048] Taking the weld reinforcement variation curve as an example, the weld reinforcement difference Δh = 0.2mm = 0.1t at 450mm (exceeding the threshold) is the turning point where the actual weld reinforcement of the first weld changes from qualified to insufficient. Therefore, the actual weld reinforcement at the starting position of the welding wire dynamic acceleration will be used as a reference. h Only with a value of 0 (1.0 mm) can the adjustment start timing of the second weld be accurately matched, and thus the target value for adjusting the dynamic speed increase of the welding wire be determined: v =1×10×(1.2 / 1)=12mm / s. The wire feeding speed of the second weld needs to be adjusted continuously from the threshold point, starting from the initial wire feeding speed of 10mm / s to the target value of 12mm / s for dynamic wire speed increase adjustment, in order to make up for the defect of continuous decay at the tail of the first weld and thus solve the problem of insufficient weld height.

[0049] It is worth noting that the target value for adjusting the dynamic speed of the welding wire is negatively correlated with the weld reinforcement height of the first weld. Specifically, if the weld reinforcement height of the first weld on the drive side is much lower than the target value for adjusting the dynamic speed of the welding wire, the smaller the weld reinforcement height and the larger the difference in reinforcement height, the larger the target value for the dynamic speed of the welding wire. In this case, it is necessary to significantly increase the wire feeding speed to ensure that sufficient welding wire enters the molten pool per unit time, thereby offsetting the severe deficiency or even collapse of the weld reinforcement height caused by the thermal deformation of the plate. Conversely, if the weld reinforcement height of the first weld on the drive side is slightly lower than the target value for adjusting the dynamic speed of the welding wire, the difference in reinforcement height between the weld reinforcement height and the preset target reinforcement height is small. In this case, only a small increase in the wire feeding speed is needed to offset the reduction in weld reinforcement height caused by slight deformation of the plate, thereby improving the consistency of the weld reinforcement height on the drive side.

[0050] S205, with reference to the initial wire feeding speed and the target value for adjusting the dynamic speed increase of the welding wire, determine the adjustment amount of the dynamic speed increase of the welding wire for the second weld.

[0051] according to By processing the initial wire feed speed and the target value for the dynamic speed increase adjustment of the welding wire, the adjustment amount of the dynamic speed increase of the welding wire is obtained. Where k2 represents the second proportionality coefficient, k3 represents the third proportionality coefficient, and k2 < k3. For example, k2 = 0.2, k3 = 0.4.

[0052] The dynamic wire speed increase adjustment is used to control the increase in wire feed speed from the initial wire feed speed to the target value of the dynamic wire speed increase adjustment. The dynamic wire speed increase adjustment is limited to 20%~40% of the speed difference (v-v0), which ensures timely replenishment of weld height while allowing a natural transition in speed increase, avoiding sudden speed changes that could lead to new weld defects. By controlling the wire feed speed of the second weld according to this increase, the weld height qualification rate after welding is ≥95%.

[0053] For example, if the initial wire feed speed is 10 mm / s and the target value for the dynamic speed increase adjustment of the welding wire is 12 mm / s, then the adjustment amount for the dynamic speed increase of the welding wire is determined as follows: Referring to the residual height variation curve, the residual height decreases slowly in the 400~500mm range, which can be selected. The wire feeding speed is adjusted accordingly. Based on this, the second weld starts at 450mm, and the wire feeding speed is increased by 0.5mm / s per second. After 4 seconds, the weld reaches 450 + (10 × 4) = 490mm, at which point the wire feeding speed reaches 12mm / s and is maintained at 12mm / s until the second weld is completed.

[0054] S206, during the welding process of the second weld, welding is started at the initial wire feeding speed. When welding reaches the starting position of the dynamic speed increase of the welding wire, the wire feeding speed of the welding machine is controlled to gradually increase from the initial wire feeding speed according to the adjustment amount of the dynamic speed increase of the welding wire to the target value of the dynamic speed increase of the welding wire, and the target value of the dynamic speed increase of the welding wire is maintained until the welding of the second weld is completed.

[0055] Specifically, the welding direction of the second weld is the same as that of the first weld, both pointing from the operating side to the driving side.

[0056] Example 1: Target value for weld reinforcement of 2.0mm specification 65Mn strip steel h The weld reinforcement height needs to be stable at 1.2mm ± 0.2mm. During the welding of the first weld, the initial wire feed speed v0 is 10mm / s. The reinforcement height variation curve shows that the reinforcement height in the first half of the first weld remains basically at 1.2mm. Starting at a distance of 450mm from the operating side, the plate deforms due to heat accumulation, increasing the weld gap and reducing the reinforcement height to 1.0mm. Based on the aforementioned preset conditions, the starting position for adjusting the dynamic speed increase of the welding wire is determined to be at 450mm. Assuming the correction coefficient is set to 1, the target value of the dynamic speed increase of the welding wire, v, is calculated to be 12mm / s using the wire feed speed calculation formula. The adjustment amount α of the dynamic speed increase of the welding wire needs to meet the following requirements: Therefore, the dynamic speed increase adjustment α of the welding wire is further determined to be 0.5 mm / s, which means that the wire feeding speed per unit time can be increased by 0.5 mm / s.

[0057] During the welding of the second weld, the initial wire feed speed was maintained at 10 mm / s for the 0-450 mm section. From 450 mm (the starting point of the insufficient reinforcement of the first weld), the wire feed speed was linearly increased, gradually increasing to 12 mm / s at a rate of 0.5 mm / s. Finally, the reinforcement height at the 500 mm tail section stabilized at 1.1 mm, meeting the fluctuation requirement of 1.2 mm ± 0.2 mm. This can be understood as follows: the wire feed speed for the first 450 mm of the second weld was 10 mm / s; from 450 mm onwards, the wire feed speed increased by 0.5 mm / s per second from 10 mm / s, reaching a maximum of 12 mm / s. Compared to the severe 0.9 mm deficiency at the tail of the first weld, the reinforcement height fluctuation range was reduced from 0.3 mm to 0.1 mm, significantly improving the consistency of the reinforcement height. This completely solved the problem of insufficient reinforcement height on the drive side and greatly reduced the risk of strip breakage during subsequent rolling.

[0058] Example 2: Target value for weld reinforcement of 4.0mm specification 75Cr1-DP780 strip steel hThe weld reinforcement height needs to be stable at 2.0mm ± 0.4mm. During the welding of the first weld, the initial wire feed speed v0 is 10mm / s. The reinforcement height variation curve shows that the reinforcement height variation in the first half of the first weld is basically maintained at 1.0mm. Starting at a distance of 500mm from the operating side, the plate deforms due to heat accumulation, the weld gap increases, and the reinforcement height decreases to 0.5mm. Therefore, the starting position for adjusting the dynamic speed increase of the welding wire is 500mm. Assuming the correction coefficient is set to 1, the target value of the dynamic speed increase of the welding wire, v, is calculated to be 20mm / s using the wire feed speed calculation formula. The adjustment amount α of the dynamic speed increase of the welding wire needs to meet the following requirements: Therefore, the dynamic speed increase adjustment α of the welding wire is further determined to be 2mm / s, that is, the wire feeding speed per unit time can be increased by 2mm / s.

[0059] During the welding of the second weld, the initial wire feed speed is maintained at 10 mm / s for the 0-500 mm section. From 500 mm (the point where the residual height of the first weld is insufficient), the wire feed speed is linearly increased, gradually increasing at a rate of 2 mm / s to 20 mm / s, until the residual height at the 500 mm end stabilizes at 2.0 mm, meeting the fluctuation requirement of 2.0 mm ± 0.2 mm. In other words, the wire feed speed for the first 500 mm of the second weld is 10 mm / s, and from 500 mm onwards, the wire feed speed increases by 2 mm / s per second from 10 mm / s, reaching a maximum of 20 mm / s.

[0060] The above are practical application examples of this solution.

[0061] Considering that during welding, the heat from the drive-side weld is conducted to the air solely through thermal radiation and convection, the accumulated heat leads to plate warping and deformation, unstable butt joint gaps, and ultimately insufficient weld reinforcement on the drive side. Traditional solutions involve adding detection, database, and intelligent control modules to the welding machine to guide the welding process. However, this approach is not practical due to high equipment modification costs, space constraints in older production lines, insufficient interfaces, and the aging of precision sensors.

[0062] The technical solution of this invention, based on the correspondence between the actual weld reinforcement height and the preset target reinforcement height value in the reinforcement height variation curve obtained from the first weld, achieves targeted dynamic adjustment of the wire feeding speed of the second weld. This precisely solves the problem of insufficient weld reinforcement height without the need for additional equipment, effectively ensuring weld reinforcement height consistency and achieving a weld reinforcement height qualification rate of ≥95% after welding, reducing the risk of wire breakage and significantly improving product yield. Furthermore, this method controls the wire feeding speed by determining the target value for the dynamic speed increase adjustment of the welding wire in the second weld, ensuring both the effectiveness of the adjustment and a natural transition in wire feeding speed, thus guaranteeing weld quality. Moreover, this solution requires no modification to production line equipment, reducing additional expenses for enterprises, is fully adaptable to both new and old production lines, and avoids the impact of production line dust and noise on precision equipment, reducing maintenance costs and extending service life.

[0063] Secondly, based on the same inventive concept as the steel coil welding method in a continuous acid-rolling production line provided in the first aspect of the embodiments described above, the present invention also provides a steel coil welding system in a continuous acid-rolling production line, see [link to documentation]. Figure 4 ,include: The module 401 is used to obtain the reinforcement height variation curve of the first weld in the welding direction after the first weld is completed; wherein, the first weld is the weld formed by the initial tail of the first steel coil and the initial head of the second steel coil, and the first weld is welded at a preset initial wire feeding speed throughout the process; the reinforcement height variation curve is the curve formed by the actual welding reinforcement height of each welding monitoring position in the welding direction of the first weld. The cutting module 402 is used to cut off the first weld and construct the second weld; wherein, the second weld is formed by the new strip tail of the first steel coil and the new strip head of the second steel coil after the first weld is cut off; the welding parameters of the first weld and the second weld are the same except for the wire feeding speed, and the plate parameters corresponding to the first weld and the second weld are the same. The first determining module 403 is used to determine the starting position of the dynamic speed increase of the welding wire based on the actual welding height of each welding monitoring position. The second determining module 404 is used to determine the target value for adjusting the dynamic speed increase of the welding wire in the second weld seam based on the actual welding height at the starting position of the dynamic speed increase of the welding wire, the initial wire feeding speed, and the preset target height value. The third determining module 405 is used to determine the amount of dynamic speed increase adjustment of the welding wire for the second weld by referring to the initial wire feeding speed and the target value of the dynamic speed increase adjustment of the welding wire. The welding control module 406 is used to start welding at the initial wire feeding speed during the welding process of the second weld. When welding reaches the starting position of the dynamic speed increase of the welding wire, the module controls the wire feeding speed of the welding machine to gradually increase from the initial wire feeding speed according to the adjustment amount of the dynamic speed increase of the welding wire to the target value of the dynamic speed increase of the welding wire, and maintains the target value of the dynamic speed increase of the welding wire until the welding of the second weld is completed.

[0064] It should be noted that the specific operation methods of each module in the steel coil welding system of the continuous acid rolling production line provided in the embodiments of the present invention have been described in detail in the method embodiments provided in the first aspect above. The specific implementation process can be referred to the method embodiments provided in the first aspect above, and will not be described in detail here.

[0065] Thirdly, based on the same inventive concept as the steel coil welding method in the continuous acid rolling production line provided in the first aspect embodiment, the present invention also discloses a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0066] Fourthly, based on the same inventive concept as the steel coil welding method in the continuous acid rolling production line provided in the first aspect embodiment, the present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the methods described above.

[0067] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages: The technical solution of this invention uses a first weld seam welded at a fixed initial wire feed speed throughout the entire process as a benchmark to obtain the weld reinforcement height variation curve in its welding direction. While maintaining consistent welding and plate parameters, the first weld seam is removed and a second weld seam is constructed. Based on the weld reinforcement height variation curve, the starting position of the dynamic increase in wire speed is determined. Combining the actual weld reinforcement height at this position, the initial wire feed speed, and the preset target weld reinforcement height, the target value and adjustment amount for dynamic speed increase adjustment are calculated. Finally, when the second weld seam reaches the starting position, the wire feed speed is controlled to gradually increase from the initial value to the target value and maintained until the welding is completed. This solution uses targeted dynamic adjustment of the wire feed speed to differentiate and control the defect of insufficient weld reinforcement height, thereby accurately compensating for the gap changes caused by heat accumulation on the drive side. This significantly improves the consistency of the weld reinforcement height after welding, achieving a weld reinforcement height qualification rate of over 95% for the material. This greatly reduces the risk of strip breakage in subsequent rolling processes, significantly improves product yield, and maintains the simplicity and economy of the welding process, adapting to the high-efficiency and stable operation requirements of high-speed continuous rolling production lines.

[0068] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0069] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for welding steel coils in a continuous pickling and rolling production line, characterized in that, The method includes: After the first weld is completed, the reinforcement height variation curve of the first weld in the welding direction is obtained; wherein, the first weld is the weld formed by the initial tail of the first steel coil and the initial head of the second steel coil, and the first weld is welded at a preset initial wire feeding speed throughout the process; the reinforcement height variation curve is the curve formed by the actual welding reinforcement height of each welding monitoring position in the welding direction of the first weld. The first weld is removed and a second weld is constructed; wherein, the second weld is formed by the new strip tail of the first steel coil and the new strip head of the second steel coil after the first weld is removed; the welding parameters of the first weld and the second weld are the same except for the wire feed speed, and the plate parameters corresponding to the first weld and the second weld are the same; The starting position of the dynamic speed increase of the welding wire is determined based on the actual welding height at each welding monitoring position. Based on the actual welding height at the starting position of the welding wire dynamic speed-up, the initial wire feeding speed, and the preset target height value, the target value for adjusting the welding wire dynamic speed-up of the second weld is determined. The adjustment amount of the dynamic speed increase of the welding wire for the second weld is determined by referring to the initial wire feeding speed and the target value of the dynamic speed increase adjustment of the welding wire. During the welding process of the second weld, welding is started at the initial wire feeding speed. When welding reaches the starting position of the dynamic speed increase of the welding wire, the wire feeding speed of the welding machine is controlled to gradually increase from the initial wire feeding speed according to the adjustment amount of the dynamic speed increase of the welding wire to the target value of the dynamic speed increase of the welding wire, and the target value of the dynamic speed increase of the welding wire is maintained until the welding of the second weld is completed.

2. The method as described in claim 1, characterized in that, The step of determining the starting position of the dynamic speed increase of the welding wire based on the actual welding height at each welding monitoring position specifically includes: Determine the difference in actual weld height relative to the preset target weld height value at each welding monitoring position; Determine whether the residual height difference at each welding monitoring position meets the preset condition: △h i >k1×t; where, △h i t is the residual height difference at the i-th welding monitoring position, t is the plate thickness of the initial strip tail of the first steel coil or the initial strip head of the second steel coil, and k1 is the first proportional coefficient. The first welding monitoring position where the residual height difference meets the preset condition is taken as the starting position of the dynamic speed increase of the welding wire.

3. The method as described in claim 1, characterized in that, The first proportionality coefficient k1 = 0.

1.

4. The method as described in claim 1, characterized in that, The step of determining the target value for adjusting the dynamic speed increase of the welding wire in the second weld seam based on the actual welding height at the starting position of the dynamic speed increase of the welding wire, the initial wire feed speed, and the preset target height value specifically includes: Substitute the actual welding height at the starting position of the dynamic increase in welding wire speed, the initial wire feed speed, and the preset target welding height value into the wire feed speed calculation formula. Determine the target value for adjusting the dynamic speed increase of the welding wire; in, v This indicates the target value for the dynamic speed increase adjustment of the welding wire. n This represents the correction factor. v 0 represents the initial wire feeding speed. h Indicates the target weld reinforcement. h 0 indicates the actual welding height at the starting position of the welding wire dynamic speed increase.

5. The method as described in claim 1, characterized in that, The step of determining the adjustment amount of the dynamic speed increase of the welding wire for the second weld, by referring to the initial wire feed speed and the target value for the dynamic speed increase adjustment of the welding wire, specifically includes: according to By processing the initial wire feed speed and the target value for the dynamic speed increase adjustment of the welding wire, the adjustment amount of the dynamic speed increase of the welding wire is obtained. Where k2 represents the second proportionality coefficient, k3 represents the third proportionality coefficient, and k2 < k3.

6. The method as described in claim 5, characterized in that, k2=0.2, k3=0.

4.

7. The method as described in claim 1, characterized in that, The welding parameters other than the wire feeding speed include: welding speed, welding power, preheating power, and annealing power; the plate parameters include: plate width on both sides of the weld, plate thickness on both sides of the weld, plate shearing accuracy, and weld butt gap.

8. A steel coil welding system in a continuous pickling and rolling production line, characterized in that, include: The module is used to obtain the reinforcement height variation curve of the first weld in the welding direction after the first weld is completed; wherein, the first weld is the weld formed by the initial tail of the first steel coil and the initial head of the second steel coil, and the first weld is welded at a preset initial wire feeding speed throughout the process; the reinforcement height variation curve is the curve formed by the actual welding reinforcement height of each welding monitoring position in the welding direction of the first weld. The cutting module is used to cut off the first weld and construct the second weld; wherein, the second weld is formed by the new strip tail of the first steel coil and the new strip head of the second steel coil after the first weld is cut off; the welding parameters of the first weld and the second weld are the same except for the wire feeding speed, and the plate parameters corresponding to the first weld and the second weld are the same; The first determining module is used to determine the starting position of the dynamic speed increase of the welding wire based on the actual welding height at each welding monitoring position. The second determining module is used to determine the target value for adjusting the dynamic speed increase of the welding wire in the second weld seam based on the actual welding height at the starting position of the dynamic speed increase of the welding wire, the initial wire feeding speed, and the preset target height value. The third determining module is used to determine the amount of dynamic speed increase adjustment of the welding wire for the second weld by referring to the initial wire feeding speed and the target value of the dynamic speed increase adjustment of the welding wire. The welding control module is used to start welding at the initial wire feeding speed during the welding process of the second weld. When welding reaches the starting position of the dynamic speed increase of the welding wire, the module controls the wire feeding speed of the welding machine to gradually increase from the initial wire feeding speed according to the adjustment amount of the dynamic speed increase of the welding wire to the target value of the dynamic speed increase of the welding wire, and maintains the target value of the dynamic speed increase of the welding wire until the welding of the second weld is completed.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 1-7.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method according to any one of claims 1-7.

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