CN115235918A - Laser weld quality detection method - Google Patents

Abstract

The invention discloses a laser weld joint quality detection method, belongs to the technical field of strip steel processing, and solves the technical problems of small detection area and low detection efficiency of the existing weld joint detection method. The detection method comprises the following steps: shearing a part with a welding seam on the strip steel to be detected to obtain a test board; providing a detection rolling mill, and obtaining the target rolling thickness of the strip steel; setting the detection rolling thickness between the two detection parts according to the obtained target rolling thickness, wherein the detection rolling thickness is not more than the target rolling thickness; the test board penetrates through a roll gap between a pair of detection rollers, and a welding seam of the strip steel to be detected is rolled through the detection part; and acquiring the surface quality of the weld rolled by the detection part. The invention can improve the detection efficiency of the quality of the welding seam and improve the detection accuracy.

Description

A kind of laser welding seam quality detection method

technical field

The invention belongs to the technical field of strip steel processing, and in particular relates to a laser welding seam quality detection method.

Background technique

Laser welding has obvious advantages such as fast welding speed and beautiful weld. There are many factors that affect the quality of the weld, such as laser power, beam characteristics, defocusing, auxiliary blowing and welding speed. In the cold-rolled strip steel production industry, laser welding welds the front and rear strips into one piece to achieve continuous rolling. If the weld quality is not good, the belt will be broken and the production line will be forced to stop, which will bring human, material and economic losses to the enterprise. In the prior art, after the welding is completed, a cupping test machine is often used to perform a cupping test on the welded seam strip, and the test results are used to evaluate the quality of the weld. Low.

SUMMARY OF THE INVENTION

The present application aims to at least to a certain extent solve the technical problems of small detection area and low detection efficiency in the existing methods for detecting welds, and for this purpose, the present application provides a method for detecting the quality of laser welds.

The technical solution of this application is as follows:

A laser welding seam quality detection method, comprising the following steps:

Cut the part with the weld on the strip to be tested to obtain the test plate;

A detection rolling mill is provided, the detection rolling includes a pair of detection rollers, the outer walls of the detection rollers are provided with detection parts, the detection parts are arranged along the axis direction of the detection rollers, and the detection parts are distant from the axis of the detection rollers The distance is greater than the radius of the detection roller, the detection parts of the two detection rollers are arranged opposite to each other, and the detection rolling mill drives the two detection rollers to rotate synchronously;

obtaining the target rolling thickness of the strip;

According to the obtained target rolling thickness, setting a detected rolling thickness between the two detection parts, and the detected rolling thickness is not greater than the target rolling thickness;

Passing the test plate through the roll gap between a pair of the detection rolls, and rolling the welding seam of the strip to be tested by the detection part;

The surface quality of the welded seam rolled by the detection part is acquired.

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

In some embodiments, the circumferential arc length of the outer wall of the detection portion is 1.2-2 times the width of the welding seam.

In some embodiments, a transition portion is provided between the outer wall of the detection portion and the outer wall of the detection roller, 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.

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

In some embodiments, the roll gap between two of the inspection rolls of the inspection mill is adjustable.

In some embodiments, in the step of cutting the part with the weld seam on the strip to be tested to obtain the test plate, two test plates are obtained, and the two test plates are respectively located at both ends of the weld seam in the welding part.

In some embodiments, the step of obtaining the target rolling thickness of the strip specifically includes:

Obtain the passes of the rolling mill for rolling the strip, and obtain the target rolling thickness of each pass.

In some embodiments, a plurality of test rolling thicknesses corresponding to the target rolling thicknesses are set according to the obtained plurality of target rolling thicknesses, and the test plates are sequentially rolled through the test rolling mill according to the pass sequence.

In some embodiments, after the step of obtaining the surface quality of the welded seam rolled by the detection unit, if the welded seam is free of defects, a cupping test is performed on the welded seam on the test plate.

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

It can be seen from the above technical solutions that the test method disclosed in the present invention uses a part of the welded part of the strip steel as a test plate, and simulates the rolling process of the rolling mill unit by rolling the test plate separately, so as to obtain the welded part of the strip steel coil. Whether the seam quality can cope with the subsequent rolling of the rolling mill, that is, by pre-measurement of the weld of each strip, the possibility of strip interruption or weld cracking during the rolling process of the coil can be greatly reduced. The probability of the rolling mill unit being shut down due to insufficient weld quality; at the same time, through the shearing of the strip in this embodiment, the sharp corners in the steel coil caused by the different widths of the two welded strips can be reduced, reducing scratches The possibility of damaging the roll surface of the upper roll of the rolling mill unit, thereby maintaining the shape of the roll surface to a certain extent, ensures the quality of the strip rolled by the roll.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 shows a schematic flowchart of a detection method in an embodiment of the present application;

Fig. 2 shows the schematic diagram of acquiring the test board in Fig. 1;

Figure 3 shows a schematic view of the rolled weld in Figure 1;

Marked in the figure: 1-test plate, 2-detection roller, 3-detection part, 4-transition part, 5-strip steel.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Furthermore, this application may repeat reference numerals and/or reference letters in different instances for the purpose of simplicity and clarity, and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, this application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

FIG. 1 shows a schematic flowchart of a detection method in an embodiment of the present application; FIG. 2 shows a schematic diagram of acquiring a test plate in FIG. 1 ; FIG. 3 shows a schematic diagram of a rolled weld in FIG. 1 .

The present application is described below in conjunction with the accompanying drawings and with reference to specific embodiments:

As shown in Fig. 1, Fig. 2 and Fig. 3, this embodiment provides a method for detecting the quality of a laser weld to obtain whether the welding quality of the weld can ensure that the steel coil is continuously stripped during the rolling process, including the following steps:

Step 100 : Cut the part with the weld seam on the strip steel 5 to be tested to obtain the test plate 1 .

Let the leading part of the two strips 5 be the welding part after welding, and the welding seam is located on the welding part. Cut one end of the welding part in the width direction to obtain the test plate 1. It should be noted that there is a welding seam on the test plate 1. Referring to FIG. 2 , in the process of shearing the test plate 1 in this embodiment, crescent shears are used to cut the welded part, so that the edge of the welded part of the sheared strip steel 5 is arc-shaped, reducing the number of strip steel 5 and the test plate 1 To avoid the strip 5 from damaging the roll surface of the rolling mill unit, it can also avoid the test plate 1 from scratching the device used for the test.

In the production line, there may be differences in the widths of the two pieces of strip steel 5 welded together, which makes the two ends of the width direction of the welded part not straight and has a right-angled tip. At the same time as the test plate 1 is obtained, the welded part of the strip steel 5 is sheared off with a tip, which further protects the rolling mill train.

Step 200 : providing a testing rolling mill, the testing rolling includes a pair of testing rolls 2 , the outer wall of the testing roll 2 is provided with a testing part 3 , the testing part 3 is arranged along the axis direction of the testing roll 2 , and the distance between the testing part 3 and the axis of the testing roll 2 The detection portions 3 of the two detection rollers 2 are arranged opposite to each other, and the detection rolling mill drives the two detection rollers 2 to rotate synchronously.

The inspection rolling mill can adopt the same structure as the rolling mill in the rolling mill group to adjust the roll gap between the inspection rollers 2 and drive the rolling of the inspection rollers 2, including the frame for installing the inspection rollers 2 and the hydraulic cylinder for driving the inspection rollers 2 to move, Motors and couplings that drive the two detection rollers 2 to rotate synchronously, as well as a reduction box that facilitates control of the rotation speed of the detection rollers 2, etc.

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

Specifically, the on-going rolling mill unit of the strip 5 needs to roll multiple passes, and each pass has different rolling thicknesses, so that the operator can set different target rolling thicknesses according to the operation requirements. It is understandable that , the target rolling thickness may include only one, or may include multiple, such as directly using the final rolling thickness as the target rolling thickness, or selecting multiple target rolling thicknesses corresponding to different pass rolling thicknesses.

Step 400 : According to the obtained target rolling thickness, the detected rolling thickness between the two detection parts 3 is set, and the detected rolling thickness is not greater than the target rolling thickness.

Specifically, if the detected rolling thickness is larger than the target rolling thickness, the force during the extrusion process of the weld will be less than the rolling force during rolling by the cold tandem mill, and the error of the detection result is large. The detection rolling thickness is not greater than the target rolling thickness, so that the welding seam can be rolled to the same setting and thinner as the target rolling thickness, and the accuracy of the detection results is improved.

Step 500 : Pass the test plate 1 through the roll gap between the pair of detection rolls 2 , and use the detection part 3 to roll the welding seam of the strip steel 5 to be tested.

It can be understood that the plane where the axes of the two detection rollers 2 are located is the reference plane. By obtaining the distance between the roller surfaces of the detection rollers 2 and the reference plane, and when the test plate 1 is set at the roller gap between the pair of detection rollers 2, the welding The gap from the seam to the reference plane can be obtained to detect when the rolling mill can roll the roll gap on the test plate 1.

Step 600 : Acquire the surface quality of the welded seam rolled by the detection unit 3 .

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

In this embodiment, a part of the welded part of the strip steel 5 is cut as the test plate 1, and the rolling process of the rolling mill group is simulated by rolling the test plate 1 separately, so as to obtain whether the quality of the welding seam on the strip steel 5 can cope with The subsequent rolling of the rolling mill, that is, by pre-measurement of the welding seam of each strip 5, the possibility of the strip being interrupted or the welding seam cracking during the rolling of the steel coil by the rolling mill is reduced, which can greatly reduce the occurrence of welding in the rolling mill. At the same time, through the shearing of the strip steel 5 in this embodiment, the sharp corners in the steel coil caused by the different widths of the two welded strip steels 5 can be reduced, and the scratching of the rolling mill can be reduced. The possibility of the roller surface on the unit, and then maintain the shape of the roller surface to a certain extent, to ensure the quality of the strip 5 rolled by the roller.

Referring to FIG. 3 , in the detection rolling mill provided in step 200 of this embodiment, the outer wall of the detection part 3 is an arc surface to ensure the same rolling force to the weld and the strip steel 5 near it. Further, the outer wall of the detection part 3 The arc length in the circumferential direction is 1.2-2 times the width of the welding seam. By increasing the rolling area of the detection part 3, the accuracy of aligning the welding seam with the detection part 3 when the welding seam is detected by the rolling mill is reduced, and the operator is improved. test efficiency.

In this embodiment, the detection portion 3 is provided 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, thereby reducing the cost of testing. 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 respectively connected with the outer wall of the detection part 3 and the outer wall of the detection roller 2, so that the transition part 4 and the detection part 3 smoothly transition to The transition part 4 is prevented from extruding an indentation on the test board 1, and the test accuracy is improved.

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

The roll gap between the two testing rolls 2 of the testing rolling mill can be adjusted, so that the testing rolling mill can be provided with multiple testing rolling thicknesses.

Referring to FIG. 2 , in the step of cutting the part with the weld on the strip 5 to be tested to obtain the test plate 1, two test plates 1 are obtained, and the two test plates 1 are respectively located at the two ends of the weld in the welding part, that is, the The two ends that are not welded are cut off by crescent shears, and the sharp corners of the welded part are cut off to further protect the roll surface of the rolling mill unit.

In this embodiment, step 300 specifically includes: acquiring the number of passes of the strip 5 rolled by the rolling mill, acquiring the target rolling thickness of each pass, and setting a plurality of target rolling thicknesses corresponding to the target rolling thicknesses according to the obtained multiple target rolling thicknesses. The test rolling thickness corresponding to the thickness, the test plate 1 is sequentially rolled through the test rolling mill according to the sequence of the passes. It can be understood that, compared with only obtaining the final rolling thickness and specifying the target rolling thickness, it is easy to make the weld be subjected to a large rolling force in a short period of time, the deformation is large, and cracks and broken strips are more likely to occur. , in this example, the detection rolling mill will simulate the rolling passes of the rolling mill unit, rolling the welds multiple times, further, the detection rolling thickness in this example is equal to the target rolling thickness, so that the rolling process restores the rolling mill The rolling process of the unit improves the reliability of the detection method. And since the test plate 1 is cut from the welding part of the steel coil, the two cut test plates 1 are tested by the inspection rolling mill, which can further improve the accuracy of the test results, and the length of the test plate 1 Short, the rolling process of the inspection mill is short, and the operator's efficiency in inspection is high.

In order to further obtain the quality of the welding seam, in step 600 , if the welding seam is free of defects, the present embodiment further includes step 700 : performing a cupping test on the welding seam on the test board 1 . The quality of the welding seam on the test plate 1 is further obtained through the cupping test, so as to facilitate the operator to judge the welding seam quality of the steel coil.

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

In this application, unless otherwise expressly specified and defined, a first feature "on" or "under" a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore It should not be construed as a limitation on this application.

It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative positional relationship, motion situation, etc. between the components under a certain posture. If the specific posture changes, the directional indication Change accordingly.

In this application, unless otherwise expressly specified and limited, the terms "connected", "fixed" and the like should be understood in a broad sense, for example, "fixed" may be a fixed connection, a detachable connection, or an integrated; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal communication between two elements or an interaction relationship between the two elements, unless otherwise explicitly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In addition, descriptions such as "first", "second", etc. in this application are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features. In the description of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection claimed in this application.

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, The scope of the application is defined by the claims and their equivalents.

Claims (10)

1. The laser welding seam quality detection method is characterized by comprising the following steps of:

shearing a part with a welding seam on the strip steel to be detected to obtain a test board;

providing a detection rolling mill, wherein 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 arranged along the axial direction of the detection rollers, the distance from the detection parts to the axial lines of the detection rollers is greater than the radius of the detection rollers, the detection parts of the two detection rollers are arranged oppositely, and the detection rolling mill drives the two detection rollers to synchronously rotate;

obtaining the target rolling thickness of the strip steel;

setting a detection rolling thickness between the two detection parts according to the obtained target rolling thickness, wherein the detection rolling thickness is not more than the target rolling thickness;

the test board penetrates through a roll gap between a pair of detection rollers, and a welding seam of the strip steel to be detected is rolled through the detection part;

and acquiring the surface quality of the weld rolled by the detection part.

2. The laser weld quality detection method according to claim 1, wherein, in the step of providing the detection rolling mill, an outer wall of the detection portion is a circular arc surface.

3. The laser weld quality detection method according to claim 2, wherein the arc length of the outer wall of the detection portion in the circumferential direction is 1.2 to 2 times the width of the weld.

4. The laser welding seam quality detection method according to claim 1, wherein transition portions are arranged on the outer wall of the detection portion and the outer wall of the detection roller, and the outer wall of each transition portion is respectively connected with the outer wall of the detection portion and the outer wall of the detection roller.

5. The laser weld quality detection method according to claim 4, wherein the outer wall of the transition part is tangent to the detection roller.

6. The laser weld quality detection method according to claim 1, wherein a roll gap between the two detection rolls of the detection rolling mill is adjustable.

7. The laser weld seam quality detecting method according to claim 1, characterized in that in the step of obtaining the test boards for cutting the part with the weld seam on the strip steel to be detected, two test boards are obtained, and the two test boards are respectively positioned at two ends of the weld seam in the welding part.

8. The laser weld quality detection method according to claim 1, wherein the step of obtaining the target rolling thickness of the strip steel specifically comprises:

and acquiring the pass of the rolling mill for rolling the strip steel, and acquiring the target rolling thickness of each pass.

9. The laser weld quality detection method according to claim 8, wherein a plurality of test rolled thicknesses corresponding to the target rolled thicknesses are set by obtaining a plurality of target rolled thicknesses, and the test plate is sequentially rolled by the test rolling mill in a pass order.

10. The laser weld seam quality detecting method according to claim 1, wherein after the step of obtaining the surface quality of the weld seam rolled by the detecting part, if the weld seam is free of defects, a cupping test is performed on the weld seam on the test plate.

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