A laser detection device and method for fillet weld leg size

Abstract

This invention proposes a laser detection device and method for fillet weld leg dimensions in the field of welding. The device includes a main body; a data display screen is located on the upper part of the main body, and function buttons are located on the lower part; the main body contains a laser rangefinder, a laser rangefinder fixing clip, a data analysis module, an input / output module, and a battery pack. The laser rangefinder includes three laser rangefinders, each measuring three specific distances. A mathematical model is constructed using these data, and the data analysis module analyzes and solves the mathematical model to obtain the detection result. The input / output module and battery pack provide power to the device and also serve as the interface for external data transmission. This invention has the advantages of simple operation, fast detection speed, and high detection accuracy. Furthermore, the use of a small display screen and button input allows for long battery life.

Description

Technical Field

[0001] This invention provides a method for inspecting fillet welds, primarily applicable to large metal structures in shipbuilding, pressure vessels, and bridge construction. Specifically, it relates to a laser-based device and method for inspecting the weld leg dimensions of fillet welds. Background Technology

[0002] In shipbuilding, pressure vessel construction, and bridge construction, approximately 60% to 80% of the workload involves welding of metal structures, a significant portion of which is fillet weld. For fillet welds, the weld leg size directly affects the overall mechanical properties of the metal structure. If the weld leg size is too small, its strength may not meet service requirements; if the weld leg height is too large, it will generate significant restraint stress or welding deformation, thus affecting the overall performance of the metal structure and potentially even impacting subsequent construction processes. Only when the weld leg size is within the range required by the process design can the steel structure be guaranteed to meet service requirements without generating excessive welding restraint. Therefore, inspecting the weld leg size is a crucial step in verifying the reliability of the steel structure.

[0003] Currently, there are many technical solutions for measuring weld leg dimensions, but most of them use mechanical measurement, requiring a measuring ruler to be clamped onto the fillet weld and the value to be read visually. For example, patent (201910988179.9) proposes a weld leg measuring gauge, which uses a rectangular inspection template to compare the fillet weld to inspect the weld leg dimensions; another patent (201710889828.0) proposes a weld leg measuring device, which uses a measuring ruler in conjunction with an auxiliary plate with scale values ​​to measure the weld leg dimensions. These inspection methods are relatively cumbersome to operate, and the measurement data is easily affected by human factors, resulting in large errors. Furthermore, the accuracy will decrease due to wear and tear over long-term use. In addition, these inspection methods can only effectively detect right-angle fillet welds, and cannot reliably detect acute or obtuse-angle fillet welds. Based on this, this invention aims to make the inspection more convenient, faster, more accurate, and more widely applicable, and proposes a laser inspection device and method for fillet weld leg dimensions. Summary of the Invention

[0004] To address the shortcomings of existing technologies and the limitations of current detection techniques, this invention provides a laser detection device and method for fillet weld leg dimensions. This method utilizes three laser rangefinders to detect distance parameters, and then calculates and quickly determines the weld leg size and the angle between the two base materials. It offers advantages such as high detection accuracy, fast detection speed, and convenient data reading and recording, thus overcoming the limitations of current detection technologies.

[0005] The solution adopted by this invention to solve the technical problem is:

[0006] A laser detection device for fillet weld leg dimensions includes a device body;

[0007] A data display screen is provided on the upper part of the device body surface, and function buttons are provided on the lower part. The data display screen and function buttons are used to input necessary information and display test results.

[0008] The device body contains a laser rangefinder sensor, a laser rangefinder sensor mounting clip, a data analysis module, an input / output module, and a battery pack.

[0009] The laser rangefinder includes a first laser rangefinder, a second laser rangefinder, and a third laser rangefinder. The first laser rangefinder is parallel to the length of the device body. The second laser rangefinder forms an angle α with the first laser rangefinder and an angle β with the third laser rangefinder. The lines containing the first, second, and third laser rangefinders intersect at a single point, which is called the "intersection point of the three laser rangefinders," or point O.

[0010] The laser rangefinder mounting clip is used to mount and fix the laser rangefinder.

[0011] The data analysis module is used to collect data from the laser rangefinder sensor and calculate the collected data to obtain the detection value. This module can also output data to the outside world through the input and output module.

[0012] The battery pack powers the laser rangefinder, data analysis module, and data display screen, and charging of the battery pack is performed via the input / output module.

[0013] The input / output module has both data output and charging functions.

[0014] To further address the technical problem this invention aims to solve, the present invention provides a laser detection method for fillet weld leg dimensions, comprising the following steps:

[0015] Step 1: Set the acceptable range of weld leg size. The fillet weld to be tested can be named according to the requirements, and the compensation amount of 'a' can be set according to the plate thickness factor.

[0016] Step 2: Place the device tightly against the first metal plate. In addition, the plane in which the three laser beams emitted by the device are located must be perpendicular to both the plane in which the first metal plate is located and the plane in which the second metal plate is located.

[0017] Step 3: After adjusting the position of the device, press the relevant function button to start collecting data. At the same time, the device will automatically perform calculations and observe the positions of points P and Q. Points P and Q are not allowed to fall on the fillet weld being tested. If either point P or Q falls on the fillet weld being tested, the device will be moved away from the fillet weld being tested until both points P and Q fall on the second metal plate.

[0018] Step 4: Remove the device to view the data. You can use the function keys to select and view historical data, including the B value and the degree of the θ angle.

[0019] Step 5: Repeat the same method as steps 1 to 4 to check the width of the fillet weld leg, i.e., the K value.

[0020] Positive effects: Compared with the prior art, the advantages of the present invention are as follows:

[0021] (1) Using a laser rangefinder for data acquisition can effectively avoid errors caused by human reading and greatly improve detection accuracy;

[0022] (2) The acceptable range of weld leg size can be preset, and the results can be directly compared during the inspection to quickly determine whether the weld leg size of the product meets the requirements.

[0023] (3) The "data analysis module" and "input / output module" have integrated functions, which makes the device highly integrated and easy to carry.

[0024] (4) The mode of using a smaller display screen and inputting necessary information through function keys can significantly reduce the standby power consumption of the device compared to the mode of using a larger touch screen for input and output, effectively improving its battery life and greatly helping the convenience of on-site inspection.

[0025] (5) The device has storage, memory and data transmission functions, which saves the time of recording data during on-site inspection and can greatly improve the detection efficiency compared with traditional weld leg rulers.

[0026] It is suitable for use as a laser detection device and method for fillet weld leg dimensions. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The description of the present invention is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0028] Figure 1 A schematic diagram illustrating the working state of a laser detection method for fillet weld leg dimensions.

[0029] Figure 2 A schematic diagram of the internal structure of a laser detection device for fillet weld leg dimensions;

[0030] Figure 3 A schematic diagram of the external structure of a laser detection device for fillet weld leg dimensions;

[0031] Figure 4 This is a schematic diagram illustrating the detection principle of a laser detection method for fillet weld leg dimensions.

[0032] In the diagram, 1. The intersection of the three laser rangefinder sensors, i.e., point O; 2. Laser rangefinder sensor mounting clip; 3-1. First laser rangefinder sensor; 3-2. Second laser rangefinder sensor; 3-3. Third laser rangefinder sensor; 4. Data analysis module; 5. Input / output module; 6. Battery pack; 7-1. First metal plate (can be beveled); 7-2. Second metal plate; 8. The fillet weld to be measured; 9. Data display screen; 10. Function buttons; 11. Device body; Point M. The intersection of the laser beam emitted by the first laser rangefinder sensor 3-1 and the fillet weld 8 to be measured; Point N. The intersection of the laser beam emitted by the first laser rangefinder sensor 3-1 and the second metal plate 7-2; Point P. The intersection of the laser beam emitted by the second laser rangefinder sensor 3-2 and the second metal plate 7-2; Point Q. The third laser... The intersection of the laser beam emitted by the ranging sensor 3-3 and the second metal plate 7-2; point H. The foot of the perpendicular from point N to the line OP of △ONP; value B. The height of the weld leg of the measured fillet weld 8; value K. The width of the weld leg of the measured fillet weld 8; value a. The value measured by the first laser ranging sensor 3-1; value b. The value measured by the second laser ranging sensor 3-2; value c. The value measured by the third laser ranging sensor 3-3; value h. The height of △ONP on the line OP; value R. The distance between the measuring ends of the three laser ranging sensors and point O; angle α. The angle between the first laser ranging sensor 3-1 and the second laser ranging sensor 3-2; angle β. The angle between the second laser ranging sensor 3-2 and the third laser ranging sensor 3-3; angle θ. The angle between the first metal plate 7-1 and the second metal plate 7-2. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In the description of the embodiments in this application, the term "multiple" refers to two or more (including two). Similarly,

[0039] "Multiple sets" refers to two or more sets (including two sets), and "multiple tablets" refers to two or more tablets (including two tablets).

[0040] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] In the description of the embodiments in this application, unless otherwise expressly specified and limited, the technical term "installation" will be used.

[0042] Terms such as “connected,” “linked,” and “fixed” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0043] according to Figure 1-3 As shown, a laser detection device for fillet weld leg size includes a device body 11;

[0044] A data display screen 9 is provided on the upper part of the surface of the device body 11, and a function button 10 is provided on the lower part. The data display screen 9 and the function button 10 are used to input necessary information and display the test results. In this embodiment, a smaller data display screen 9 is used to reduce standby power consumption.

[0045] The device body 11 contains a laser rangefinder sensor, a laser rangefinder sensor mounting clip 2, a data analysis module 4, an input / output module 5, and a battery pack 6. The laser rangefinder sensor is reliably installed inside the device body 1 through the laser rangefinder sensor mounting clip 2. The laser rangefinder sensor is connected to the data analysis module 4, and the data analysis module 4 is also connected to the input / output module 5 and the battery pack 6.

[0046] The laser rangefinder includes a first laser rangefinder 3-1, a second laser rangefinder 3-2, and a third laser rangefinder 3-3. The first laser rangefinder 3-1 is parallel to the length direction of the device body 11. The second laser rangefinder 3-2 forms an angle α with the first laser rangefinder 3-1 and an angle β with the third laser rangefinder 3-3. The straight lines containing the first laser rangefinder 3-1, the second laser rangefinder 3-2, and the third laser rangefinder 3-3 intersect at a point called the "intersection point of the three laser rangefinders", i.e., point O1.

[0047] The laser rangefinder mounting clip 2 is used to mount and fix the laser rangefinder.

[0048] Data analysis module 4 is used to collect data from the laser rangefinder sensor and calculate the collected data to obtain the detection value. This module can also output data to the outside through input / output module 5.

[0049] Battery pack 6 is used to maintain power supply to the laser rangefinder, data analysis module 4 and data display screen 9, and charging of battery pack 6 is performed through input / output module 5;

[0050] Input / output module 5 has both data output and charging functions;

[0051] Among them, the distances from the ends of the first laser rangefinder 3-1, the second laser rangefinder 3-2, and the third laser rangefinder 3-3 to point O1, the "intersection of the three laser rangefinder installation points", are equal, and this value is represented by the letter R for easy use in subsequent data calculations;

[0052] The included angles between the first laser rangefinder 3-1, the second laser rangefinder 3-2, and the third laser rangefinder 3-3 are fixed, and their angles are represented by α and β respectively, and converted to radians before trigonometric function calculations.

[0053] The device body 11 uses function buttons 10 to select functions and input necessary information, and displays the test results through the data display screen 9. It can detect the weld leg height, weld leg width, and the included angle between the two base materials.

[0054] according to Figure 4 As shown, a laser detection device for fillet weld leg dimensions involves six geometric feature points during detection, namely:

[0055] Point O1 is the intersection of the three laser rangefinder sensors. Point M is the intersection of the laser beam emitted by the first laser rangefinder sensor 3-1 and the measured fillet weld 8. Point N is the intersection of the laser beam emitted by the first laser rangefinder sensor 3-1 and the second metal plate 7-2. Point P is the intersection of the laser beam emitted by the second laser rangefinder sensor 3-2 and the second metal plate 7-2. Point Q is the intersection of the laser beam emitted by the third laser rangefinder sensor 3-3 and the second metal plate 7-2. Point H is the foot of the perpendicular line OP drawn from point N to △ONP.

[0056] A laser detection device for fillet weld leg size involves six values ​​during detection, including three measured values, two calculated values, and one known quantity.

[0057] The three measured values ​​are: value a is the value measured by the first laser rangefinder sensor 3-1, value b is the value measured by the second laser rangefinder sensor 3-2, and value c is the value measured by the third laser rangefinder sensor 3-3.

[0058] The two calculated values ​​are: h is the height of △ONP on the straight line OP, and B is the height of the weld leg of the measured fillet weld 8;

[0059] One known quantity is: R is the distance between the measuring ends of the three laser rangefinders and point O.

[0060] A laser detection device for fillet weld leg size involves three angles during detection, including two known angles and one calculated angle.

[0061] The two known angles are: angle α is the angle between the first laser rangefinder 3-1 and the second laser rangefinder 3-2, and angle β is the angle between the second laser rangefinder 3-2 and the third laser rangefinder 3-3.

[0062] One calculated angle is: angle θ is the angle between the first metal plate 7-1 and the second metal plate 7-2.

[0063] A laser inspection method for fillet weld leg dimensions includes the following steps:

[0064] Step 1: Set the acceptable range of weld leg size. The fillet weld to be tested can be named according to the requirements, and the compensation amount of 'a' can be set according to the plate thickness factor.

[0065] Step 2: Place the device as follows Figure 1 As shown, it is closely attached to the first metal plate 7-1. In addition, it is required that the plane in which the three laser beams emitted by the device are located is perpendicular to both the plane in which the first metal plate 7-1 is located and the plane in which the second metal plate 7-2 is located.

[0066] Step 3: After adjusting the position of the device, press the relevant function button 10 to start collecting data. At the same time, the device will automatically perform calculations and observe the positions of points P and Q. Points P and Q are not allowed to fall on the fillet weld 8 being measured. If either point P or Q falls on the fillet weld 8 being measured, the device will be moved away from the fillet weld 8 being measured until both points P and Q fall on the second metal plate 7-2.

[0067] Step 4: Remove the device to view the data. You can select to view the historical data B value and the degree of the θ angle using function button 10.

[0068] Step 5: Repeat Step 4 using the same method to check the width of the fillet weld leg, i.e., the K value.

[0069] Calculation process:

[0070] (1) The calculation process for the weld leg height B is as follows:

[0071] like Figure 4 As shown, the following relationship can be derived from the formula for the area of ​​a triangle:

[0072] Area of ​​△ONP:

[0073] The area of ​​△OPQ:

[0074] The area of ​​△ONQ:

[0075] Adding relation (1) and relation (2) together, we get:

[0076]

[0077] Due to S △ONQ =S △ONP +S △OPQ By combining relations (3) and (4), we can obtain:

[0078]

[0079] like Figure 4 As shown, based on the values ​​of each line segment marked in the diagram, the following relationship can be established:

[0080] |ON|=R+a+B (6)

[0081] |OP|=R+b (7)

[0082] |OQ|=R+c (8)

[0083] Substituting relations (6), (7), and (8) into relation (5), and after simplification, the formula for calculating the value of B can be obtained:

[0084]

[0085] In the above formula, the value of 'a' includes a compensation amount, which is adjusted according to the actual situation to correct the deviation.

[0086] (2) The calculation process of the angle θ between the first metal plate 7-1 and the second metal plate 7-2 is as follows:

[0087] like Figure 4 As shown, the size of ∠ONP is θ. For ease of calculation, a perpendicular line NH is drawn from point N to the line OP. The position of point H then has three possible configurations:

[0088] Case 1: Point H coincides with point P.

[0089] At this point, the relationship exists: |ON|cosα=|OP|, that is, (R+a+B)cosα=R+b

[0090] By comparing sizes using the data analysis module, when the relation (R+a+B)cosα=R+b holds true...

[0091] Case 2: Point H falls on line segment OP

[0092] At this point, the relationship exists: |ON|cosα<|OP|, that is, (R+a+B)cosα<R+b.

[0093] By comparing the magnitudes using the data analysis module, when the relation (R+a+B)cosα<R+b holds, θ=∠0NH+∠HNP

[0094] Depend on It can be known

[0095] at the same time

[0096] And substituting |HP|=R+b-(R+a+B)cosα and |NH|=(R+α+B)sinα

[0097] Ultimately, it can be concluded that

[0098] Case 3: Point H falls on the extension line of OP.

[0099] At this point, the relationship exists: |ON|cosα>|OP|, that is, (R+a+B)cosα>R+b.

[0100] By comparing the magnitudes using the data analysis module, when the relation (R+a+B)cosα>R+b holds true, θ=∠ONH-∠PNH

[0101] Depend on It can be known

[0102] at the same time

[0103] And substituting |HP|=(R+a+B)cosα-(R+b) and |NH|=(R+a+B)sinα

[0104] Ultimately, it can be concluded that

[0105] The above three cases are judged by the data analysis module 4 by comparing the sizes, and then calculated according to the corresponding formula to finally obtain the size of angle θ.

[0106] The working principle of this embodiment:

[0107] Three laser rangefinders measure three specific distances respectively, and a mathematical model is constructed using these data. The data analysis module 4 analyzes and solves the mathematical model to obtain the detection results.

[0108] Features of this embodiment:

[0109] Input / output module 5 and battery pack 6 are used to supplement the power supply of the device and also serve as the interface for external data transmission. It boasts advantages such as simple operation, fast detection speed, and high detection accuracy. Furthermore, its small display screen and button input interaction method allow for long battery life, making the device highly versatile.

[0110] Finally, it should be noted that:

[0111] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A laser detection device for fillet weld leg dimensions, characterized in that: Including the device body (11); A data display screen (9) is provided on the upper part of the surface of the device body (11), and a function button (10) is provided on the lower part. The data display screen (9) and the function button (10) are used to input necessary information and display the test results. The device body (11) contains a laser range sensor, a laser range sensor fixing clip (2), a data analysis module (4), an input / output module (5), and a battery pack (6). The laser ranging sensor includes a first laser ranging sensor (3-1), a second laser ranging sensor (3-2), and a third laser ranging sensor (3-3). The first laser ranging sensor (3-1) is parallel to the length direction of the device body (11), the second laser ranging sensor (3-2) forms an angle α with the first laser ranging sensor (3-1), and the second laser ranging sensor (3-2) forms an angle β with the third laser ranging sensor (3-3). The straight lines containing the first laser ranging sensor (3-1), the second laser ranging sensor (3-2), and the third laser ranging sensor (3-3) intersect at a point, which is called the "intersection point of the three laser ranging sensors", i.e., point O (1). The laser rangefinder fixing clip (2) is used to install and fix the laser rangefinder. The data analysis module (4) is used to collect data from the laser rangefinder and calculate the collected data to obtain the detection value. This module can also output data to the outside through the input / output module (5). The battery pack (6) is used to maintain the power supply of the laser rangefinder, the data analysis module (4) and the data display screen (9), and the charging of the battery pack (6) is carried out through the input / output module (5); The input / output module (5) has both data output and charging functions; The application of this device involves six geometric feature points during measurement, namely: Point O (1) is the intersection of the three laser rangefinder sensors; Point M is the intersection of the laser beam emitted by the first laser ranging sensor (3-1) and the fillet weld (8) being measured; Point N is the intersection of the laser beam emitted by the first laser rangefinder (3-1) and the second metal plate (7-2); Point P is the intersection of the laser beam emitted by the second laser rangefinder (3-2) and the second metal plate (7-2); Point Q is the intersection of the laser beam emitted by the third laser rangefinder (3-3) and the second metal plate (7-2); Point H is the foot of the perpendicular drawn from point N to line OP of triangle ONP; The detection involves six values, including three measured values, two calculated values, and one known quantity. The three measured values ​​are: value a is the value measured by the first laser rangefinder (3-1), value b is the value measured by the second laser rangefinder (3-2), and value c is the value measured by the third laser rangefinder (3-3). The two calculated values ​​are: h is the height of △ONP on the straight line OP, and B is the height of the weld leg of the measured fillet weld (8); One known quantity is: R is the distance between the measuring ends of the three laser rangefinders and point O; The detection involves three angles: two known angles and one calculated angle. The two known angles are: angle α is the angle between the first laser rangefinder (3-1) and the second laser rangefinder (3-2), and angle β is the angle between the second laser rangefinder (3-2) and the third laser rangefinder (3-3); One calculation angle is: angle θ is the angle between the first metal plate (7-1) and the second metal plate (7-2).

2. The laser detection device for fillet weld leg dimensions according to claim 1, characterized in that: The distances from the ends of the first laser rangefinder (3-1), the second laser rangefinder (3-2), and the third laser rangefinder (3-3) to point O (1), the "intersection of the three laser rangefinder installation points", are equal, and this value is represented by the letter R.

3. The laser detection device for fillet weld leg dimensions according to claim 1, characterized in that: The included angles between the first laser rangefinder (3-1), the second laser rangefinder (3-2), and the third laser rangefinder (3-3) are fixed, and their angles are replaced by α and β respectively, and converted to radians before trigonometric function calculation.

4. The laser detection device for fillet weld leg dimensions according to claim 1, characterized in that: The device body (11) uses function keys (10) to select functions and input necessary information, and displays the detection results through the data display screen (9). It can detect the weld leg height, weld leg width and the angle between the two base materials.

5. A laser inspection method for fillet weld leg dimensions, characterized in that: The laser detection device for fillet weld leg dimensions according to any one of claims 1-4 includes the following steps: Step 1: Set the acceptable range of weld leg size. The fillet weld to be tested can be named according to the requirements, and the compensation amount of 'a' can be set according to the plate thickness factor. Step 2: Place the device tightly against the first metal plate (7-1). In addition, the plane in which the three laser beams emitted by the device are located must be perpendicular to both the plane in which the first metal plate (7-1) is located and the plane in which the second metal plate (7-2) is located. Step 3: After adjusting the position of the device, press the relevant function button (10) to start collecting data. At the same time, the device will automatically perform calculations and observe the positions of points P and Q. Points P and Q are not allowed to fall on the fillet weld (8) being tested. If either point P or Q falls on the fillet weld (8) being tested, the device will be moved away from the fillet weld (8) until both points P and Q fall on the second metal plate (7-2). Step 4: Remove the device to view the data. You can select to view the historical data B value and the degree of the θ angle using the function button (10); Step 5: Repeat the same method as steps 1 to 4 to check the width of the fillet weld leg, i.e., the K value.

6. The laser detection method for fillet weld leg dimensions according to claim 5, characterized in that: Calculation of weld leg height B: ； Where R is the distance between the measuring ends of the three laser rangefinders and point O; The value of 'a' is the value measured by the first laser rangefinder (3-1). The value of b is the value measured by the second laser rangefinder (3-2). The value of c is the value measured by the third laser rangefinder (3-3); Angle α is the angle between the first laser rangefinder (3-1) and the second laser rangefinder (3-2). β is the angle between the second laser rangefinder (3-2) and the third laser rangefinder (3-3).

7. The laser detection method for fillet weld leg dimensions according to claim 5, characterized in that: Calculation of the angle θ between the first metal plate (7-1) and the second metal plate (7-2): Point H coincides exactly with point P: ; Point H falls on line segment OP: ; Point H falls on the extension of OP: ; Among them, the intersection of the laser beam emitted by the second laser ranging sensor (3-2) at point P and the second metal plate (7-2); Point O is the intersection of the three laser rangefinder sensors; Point N is the intersection of the laser beam emitted by the first laser rangefinder (3-1) and the second metal plate (7-2); Point H is the foot of the perpendicular drawn from point N to line OP of triangle ONP; R is the distance between the measuring ends of the three laser rangefinders and point O; The value of 'a' is the value measured by the first laser rangefinder (3-1). The value of b is the value measured by the second laser rangefinder (3-2). B is the weld leg height of the fillet weld (8) being tested; Angle α is the angle between the first laser rangefinder (3-1) and the second laser rangefinder (3-2).

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