A laser weld quality detection method

Abstract

The present invention discloses a laser weld quality detection method, which belongs to the technical field of strip steel processing, and solves the technical problems of small detection area and low detection efficiency of existing weld detection methods. The detection method comprises the following steps: cutting the part with weld on the strip steel to be detected to obtain a test plate; providing a detection rolling mill to obtain the target rolling thickness of the strip steel; setting the detection rolling thickness between two detection parts according to the obtained target rolling thickness, and the detection rolling thickness is not greater than the target rolling thickness; passing the test plate through the roller gap between a pair of detection rollers, and rolling the weld of the strip steel to be detected through the detection part; and obtaining the surface quality of the weld rolled by the detection part. The present invention can improve the detection efficiency of weld quality and improve the accuracy of detection.

Description

Technical Field

[0001] The invention belongs to the technical field of strip steel processing, and in particular relates to a laser weld quality detection method. Background Art

[0002] Laser welding has obvious advantages such as fast welding speed and beautiful welds. There are many factors that affect the quality of the weld, such as laser power, beam characteristics, defocus, auxiliary blowing and welding speed. In the cold-rolled strip production industry, laser welding welds the front and rear rolls of strip steel into one body to achieve continuous rolling. If the weld quality is not good, it will cause the strip to break and force the production line to stop, causing manpower, material and economic losses to the company. In the prior art, after welding is completed, a cupping test machine is often used to perform a cupping test on the weld strip steel, and the test results are used to evaluate the weld quality. The cupping test covers a small area, takes a long time to test, and has low test efficiency. Summary of the invention

[0003] The present application aims to at least to some extent solve the technical problems of the existing methods for detecting welds, such as small detection area and low detection efficiency. To this end, the present application provides a laser weld quality detection method.

[0004] The technical solution of this application is as follows:

[0005] A laser weld quality detection method comprises the following steps:

[0006] Cutting the welded portion of the strip to be tested to obtain a test plate;

[0007] A detection rolling mill is provided, wherein the detection rolling mill comprises a pair of detection rollers, wherein the outer wall of the detection roller is provided with a detection portion, wherein the detection portion is provided along the axis direction of the detection roller, wherein the distance between the detection portion and the axis of the detection roller is greater than the radius of the detection roller, wherein the detection portions of the two detection rollers are provided opposite to each other, and wherein the detection rolling mill drives the two detection rollers to rotate synchronously;

[0008] Obtaining a target rolling thickness of the steel strip;

[0009] According to the obtained target rolling thickness, a detection rolling thickness between the two detection parts is set, and the detection rolling thickness is not greater than the target rolling thickness;

[0010] Passing the test plate through the roller gap between a pair of the detection rollers, and rolling the weld of the strip steel to be detected through the detection part;

[0011] The surface quality of the weld rolled by the inspection unit is obtained.

[0012] In some embodiments, in the step of providing a detection rolling mill, the outer wall of the detection portion is an arc surface.

[0013] In some embodiments, the arc length of the circumferential outer wall of the detection portion is 1.2-2 times the width of the weld.

[0014] In some embodiments, an outer wall of the detection portion and an outer wall of the detection roller are provided with a transition portion, and the outer walls of the transition portion are respectively connected to the outer wall of the detection portion and the outer wall of the detection roller.

[0015] In some embodiments, an outer wall of the transition portion is tangent to the detection roller.

[0016] In some embodiments, the roll gap between the two detection rolls of the detection rolling mill is adjustable.

[0017] In some embodiments, in the step of obtaining a test plate from the portion having a weld on the shearing steel strip to be tested, two test plates are obtained, and the two test plates are respectively located at two ends of the weld in the welding portion.

[0018] In some embodiments, the step of obtaining the target rolling thickness of the steel strip specifically includes:

[0019] The passes of the rolling mill for rolling the steel strip are obtained, and the target rolling thickness of each pass is obtained.

[0020] In some embodiments, a plurality of target rolling thicknesses are obtained, and a plurality of detection rolling thicknesses corresponding to the target rolling thicknesses are set, and the test plates are rolled sequentially through the detection rolling mill in a pass order.

[0021] In some embodiments, after the step of obtaining the surface quality of the weld rolled by the inspection unit, if the weld has no defects, a cupping test is performed on the weld on the test plate.

[0022] The embodiments of the present application have at least the following beneficial effects:

[0023] It can be seen from the above technical scheme that the testing method disclosed in the present invention cuts part of the welding part of the strip as a test plate, and simulates the rolling process of the rolling mill unit by rolling the test plate separately, so as to obtain whether the quality of the weld on the strip coil can cope with the rolling of the subsequent rolling mill unit, that is, by pre-measuring the weld of each strip steel, the possibility of the steel coil breaking or the weld cracking during the rolling of the rolling mill unit is reduced, which can greatly reduce the probability of the rolling mill unit stopping due to poor weld quality; at the same time, through the shearing of the strip steel in this embodiment, the sharp corners in the steel coil caused by the different widths of the two welded strip steels can be reduced, and the possibility of scratching the roller surface of the rolling mill unit can be reduced, thereby maintaining the shape of the roller surface to a certain extent, and ensuring the quality of the strip steel rolled by the roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the process of the detection method in the embodiment of the present application is shown;

[0026] Figure 2 Shows Figure 1 A schematic diagram of obtaining a test board in ;

[0027] Figure 3 Shows Figure 1 Schematic diagram of the rolled weld in;

[0028] Markings in the figure: 1-test plate, 2-detection roller, 3-detection part, 4-transition part, 5-strip steel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0031] Figure 1 A schematic diagram of the process of the detection method in the embodiment of the present application is shown; Figure 2 Shows Figure 1 A schematic diagram of obtaining a test board in ; Figure 3 Shows Figure 1 Schematic diagram of the rolled weld.

[0032] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0033] like Figure 1 , Figure 2 and Figure 3As shown, this embodiment provides a laser weld quality detection method to determine whether the welding quality of the weld can ensure that the steel coil is not broken during the rolling process, including the following steps:

[0034] Step 100: Cut the portion with the weld on the steel strip 5 to be tested to obtain a test plate 1.

[0035] The position of the two strip steels 5 after welding is the welding part, the weld is located on the welding part, and one end of the welding part in the width direction is cut to obtain the test plate 1. It should be noted that there is a weld on the test plate 1. Figure 2 In the process of shearing the test plate 1, the present embodiment uses a crescent shear to shear the welding part, so that the edge of the welding part of the strip steel 5 after shearing is arc-shaped, reducing the sharp edges on the strip steel 5 and the test plate 1, preventing the strip steel 5 from damaging the roller surface of the rolling mill unit, and also preventing the test plate 1 from scratching the device used for the test.

[0036] In the operating production line, there may be a difference in the width of the two steel strips 5 welded together, which makes the two ends of the welded portion not straight in the width direction and have right-angled tips. By shearing in this embodiment, while obtaining the test plate 1, the sharp tip of the welded portion of the steel strip 5 is cut off, thereby further protecting the rolling mill unit.

[0037] Step 200: Provide an inspection rolling mill, which includes a pair of inspection rollers 2. An inspection portion 3 is provided on the outer wall of the inspection roller 2. The inspection portion 3 is arranged along the axial direction of the inspection roller 2. The distance between the inspection portion 3 and the axis of the inspection roller 2 is greater than the radius of the inspection roller 2. The inspection portions 3 of the two inspection rollers 2 are arranged opposite to each other, and the inspection rolling mill drives the two inspection rollers 2 to rotate synchronously.

[0038] The detection rolling mill can adopt the same structure as the rolling mill in the rolling mill unit to adjust the roll gap between the detection rollers 2 and drive the rolling of the detection rollers 2, including a frame for mounting the detection rollers 2 and a hydraulic cylinder for driving the detection rollers 2 to move, a motor and a coupling for driving the two detection rollers 2 to rotate synchronously, and a reduction box for facilitating the control of the rotation speed of the detection rollers 2.

[0039] Step 300: Obtain the target rolling thickness of the steel strip 5.

[0040] Specifically, the strip 5 needs to be rolled in multiple passes in the rolling mill unit, and each pass has a different rolling thickness. Therefore, the operator can set different target rolling thicknesses according to the operation requirements. It can be understood that the target rolling thickness may include only one or multiple target rolling thicknesses, such as directly using the final rolling thickness as the target rolling thickness, or selecting multiple target rolling thicknesses corresponding to different rolling thicknesses.

[0041] Step 400: By obtaining the target rolling thickness, a detection rolling thickness between two detection parts 3 is set, and the detection rolling thickness is not greater than the target rolling thickness.

[0042] Specifically, if the detected rolling thickness is greater than the target rolling thickness, the force applied to the weld during the extrusion process will be smaller than the rolling force during the rolling of the cold rolling mill, and the error of the detection result will be large. Therefore, by detecting that the rolling thickness is not greater than the target rolling thickness, the weld can be rolled to a thinner setting than the target rolling thickness, thereby improving the accuracy of the detection result.

[0043] Step 500: The test plate 1 is passed through the roller gap between a pair of detection rollers 2, and the weld of the steel strip 5 to be detected is rolled through the detection section 3.

[0044] It can be understood that, by taking the plane where the axes of the two detection rollers 2 are located as the reference plane, by obtaining the distance from the roller surface of the detection roller 2 to the reference plane, and the distance from the weld to the reference plane when the test plate 1 is set in the roll gap between a pair of detection rollers 2, it is possible to obtain when the detection rolling mill can roll the roll gap on the test plate 1.

[0045] Step 600: Obtain the surface quality of the weld rolled by the inspection unit 3.

[0046] If the test plate 1 rolled by the inspection part 3 has defects such as poor welding, cracks on the weld surface, and broken strips, it can be judged that the weld quality on the steel strip is unqualified and cannot be adapted to the subsequent rolling of the rolling mill unit.

[0047] In this embodiment, part of the welding portion of the steel strip 5 is cut as a test plate 1, and the rolling process of the rolling mill unit is simulated by rolling the test plate 1 separately, so as to obtain whether the quality of the weld on the steel strip 5 can cope with the subsequent rolling of the rolling mill unit, that is, by pre-measuring the weld of each steel strip 5, the possibility of the steel strip breaking or the weld cracking during the rolling of the rolling mill unit is reduced, which can greatly reduce the probability of the rolling mill unit stopping due to poor weld quality; at the same time, through the shearing of the steel strip 5 in this embodiment, the sharp corners in the steel coil caused by the different widths of the two welded steel strips 5 can be reduced, and the possibility of scratching the roller surface of the rolling mill unit can be reduced, thereby maintaining the shape of the roller surface to a certain extent, and ensuring the quality of the steel strip 5 rolled by the roller.

[0048] Reference Figure 3 In the inspection mill provided in step 200 of this embodiment, the outer wall of the inspection part 3 is an arc surface to ensure that the rolling force on the weld and the strip steel 5 near it is the same. Furthermore, the circumferential arc length of the outer wall of the inspection part 3 is 1.2-2 times the width of the weld. By increasing the rolling area of ​​the inspection part 3, the accuracy of aligning the weld with the inspection part 3 when the inspection mill rolls the weld is reduced, thereby improving the testing efficiency of the operator.

[0049] In this embodiment, the detection part 3 is arranged on the detection roller 2, which can greatly reduce the weight of the detection roller 2, thereby reducing the requirements for other devices in the detection rolling mill, and thereby reducing the cost of the test. The outer wall of the detection part 3 and the outer wall of the detection roller 2 are provided with a transition part 4, and the outer wall of the transition part 4 is connected to the outer wall of the detection part 3 and the outer wall of the detection roller 2 respectively, so that the transition part 4 and the detection part 3 are smoothly transitioned to avoid the transition part 4 squeezing out an indentation on the test plate 1, thereby improving the accuracy of the test.

[0050] Furthermore, the outer wall of the transition portion 4 is tangent to the detection roller 2. In order to further make the outer ring surface of the detection roller 2 smooth, in this embodiment, the arc of the arc surface of the detection portion 3 is less than π / 3, so that the cross section of the detection roller 2 is teardrop-shaped, which is convenient for operation.

[0051] The roll gap between the two detection rolls 2 of the detection rolling mill is adjustable, so that the detection rolling mill can be provided with a plurality of detection rolling thicknesses.

[0052] Reference Figure 2 In the step of obtaining the test plate 1 by shearing the part with the weld on the strip steel 5 to be tested, two test plates 1 are obtained. The two test plates 1 are respectively located at the two ends of the weld in the welding part, that is, both ends of the weld are cut off by crescent shears, and the sharp corners of the weld are cut off to further protect the roller surface of the rolling mill unit.

[0053] In this embodiment, step 300 specifically includes: obtaining the pass of the rolling mill rolling the strip steel 5, obtaining the target rolling thickness of each pass, and setting multiple detection rolling thicknesses corresponding to the target rolling thicknesses through the obtained multiple target rolling thicknesses, and rolling the test plate 1 in sequence through the detection rolling mill in accordance with the pass order. It can be understood that compared with only obtaining the final rolling thickness, specifying the target rolling thickness is easy to make the weld subject to a larger rolling force in a short time, the deformation is large, and cracks and broken strips are more likely to occur. Therefore, in this example, the detection rolling mill will simulate the rolling pass of the rolling mill unit and roll the weld multiple times. Further, the detection rolling thickness in this embodiment is equal to the target rolling thickness, so that the rolling process restores the rolling process of the rolling mill unit, and improves the reliability of the detection method. And because the test plate 1 is cut from the welding part of the steel coil, the two cut test plates 1 are tested by the detection rolling mill, which can further improve the accuracy of the test results, and the length of the test plate 1 is short, the rolling process of the detection rolling mill is short, and the efficiency of the operator during the detection is high.

[0054] In order to further obtain the quality of the weld, in step 600, if the weld has no defects, this embodiment further includes step 700: performing a cupping test on the weld on the test plate 1. The cupping test is used to further obtain the quality of the weld on the test plate 1, so as to facilitate the operator to make a judgment on the weld quality of the steel coil.

[0055] As a specific implementation, in this embodiment, the diameter of the detection roller 2 is in the range of 30-600 mm, the thickness of the steel strip 5 is in the range of 1-6 mm, and the moving speed of the test plate 1 is 30-100 m / min.

[0056] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0059] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0062] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0063] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A laser weld quality detection method, characterized in that: The following steps are involved: Cutting the welded portion of the strip to be tested to obtain a test plate; A detection rolling mill is provided, the detection rolling mill comprises a pair of detection rollers, the outer walls of the detection rollers are provided with detection parts, the detection parts are provided along the axis direction of the detection rollers, the distance between the detection parts and the axis of the detection rollers is greater than the radius of the detection rollers, the detection parts of the two detection rollers are arranged opposite to each other, the outer walls of the detection parts are arc surfaces, the outer walls of the detection parts and the outer walls of the detection rollers are provided with transition parts, the outer walls of the transition parts are respectively connected with the outer walls of the detection parts and the outer walls of the detection rollers, the outer walls of the transition parts are tangent to the detection rollers, and the detection rolling mill drives the two detection rollers to rotate synchronously; Obtaining a target rolling thickness of the steel strip; According to the obtained target rolling thickness, a detection rolling thickness between the two detection parts is set, and the detection rolling thickness is not greater than the target rolling thickness; Passing the test plate through the roller gap between a pair of the detection rollers, and rolling the weld of the strip steel to be detected through the detection part; The surface quality of the weld rolled by the inspection unit is obtained.

2. The laser weld quality detection method according to claim 1, characterized in that: The arc length of the outer wall of the detection part in the circumferential direction is 1.2-2 times of the width of the weld.

3. The laser weld quality detection method according to claim 1, characterized in that: The roll gap between the two detection rolls of the detection rolling mill is adjustable.

4. The laser weld quality detection method according to claim 1, characterized in that: In the step of obtaining test plates from the portion with a weld on the shearing steel strip to be tested, two test plates are obtained, and the two test plates are respectively located at two ends of the weld in the welding portion.

5. The laser weld quality detection method according to claim 1, characterized in that: The step of obtaining the target rolling thickness of the strip steel specifically comprises: The passes of the rolling mill for rolling the steel strip are obtained, and the target rolling thickness of each pass is obtained.

6. The laser weld quality detection method according to claim 5, characterized in that: By obtaining a plurality of target rolling thicknesses, a plurality of detection rolling thicknesses corresponding to the target rolling thicknesses are set, and the test plates are rolled sequentially through the detection rolling mill in a pass order.

7. The laser weld quality detection method according to claim 1, characterized in that: After the step of obtaining the surface quality of the weld rolled by the inspection unit, if the weld has no defects, a cupping test is performed on the weld on the test plate.

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