High-power laser autogenous welding heat source model construction method and system
By welding the finite element model at multiple laser incident angles, calculating the welding mass coefficient and determining the optimal angle, a high-quality heat source model was constructed, which solved the problem that the existing model failed to consider the change in the laser incident angle, and improved the welding quality and model accuracy.
Patent Information
- Application Number
- CN202510336812.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-04-18
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing heat source model fails to fully consider the impact of laser incident angle changes on the welding process during high-power laser welding, resulting in poor welding quality.
By constructing a finite element model of the target workpiece and welding processing at multiple laser incident angles, the welding mass coefficient at each angle is calculated and the optimal laser incident angle is determined, thereby building a high-quality heat source model.
The laser welding parameters are optimized, the welding quality is improved, and a high-quality heat source model is provided, providing a reliable data basis for subsequent analysis of temperature field, stress field and melt pool flow.
Smart Images
Figure CN119839445A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of laser welding technology, and in particular to a method and system for constructing a heat source model for high-power laser autogenous welding. Background Art
[0002] High-power laser welding is an advanced manufacturing technology that uses a high-density laser beam to partially melt the material and achieve welding connection. Due to its advantages of high energy density, fast welding speed, high weld quality and strong adaptability to welding materials, high-power laser welding has been widely used in aerospace, automobile manufacturing, electronic equipment, medical equipment and other fields. Especially in the manufacturing of key components that require high-precision and high-strength connections, high-power laser welding has shown significant technical advantages.
[0003] In order to deeply understand and optimize the laser welding process, numerical simulation analysis has become an important research method. Numerical simulation can comprehensively and deeply study the time, spatial distribution and evolution of temperature field, stress field and molten pool flow during welding without a large number of experiments. Among them, the heat source model, as the basis and key of numerical simulation, directly determines the accuracy and reliability of the simulation results. At present, the commonly used heat source models include Gaussian distribution model, double Gaussian distribution model and other empirical models, which can describe the distribution of laser energy in the workpiece to a certain extent. However, these traditional heat source models usually assume that the laser incident angle is a fixed value, and fail to fully consider the impact of changes in the laser incident angle on the welding process. Summary of the invention
[0004] The present application provides a method and system for constructing a heat source model for high-power laser autogenous welding to solve the problems raised by the above-mentioned background technology.
[0005] In a first aspect, the present application provides a method for constructing a heat source model for high-power laser autogenous welding, comprising: Constructing a workpiece model of a target workpiece, and performing finite element segmentation processing on the workpiece model to obtain a finite element model corresponding to the workpiece model, and for each finite element unit of the finite element model, recording a first position of the finite element unit; Acquiring welding parameter information of the target workpiece in a database based on the material information of the target workpiece; Based on the welding parameter information, a preset virtual high-power laser welding device is controlled to perform welding processing on the finite element model under a variety of laser incident angles; wherein the laser incident angle is the angle between the laser incident direction and the gravity direction; For each of the laser incident angles, after welding the finite element model at the laser incident angle, obtaining a second position of each of the finite element units, and determining a welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each of the finite element units; The laser incident angle corresponding to the maximum welding quality coefficient is determined as the target laser incident angle, and a heat source model corresponding to the target workpiece at the target laser incident angle is constructed.
[0006] In a possible implementation manner, building an artifact model of a target artifact includes: Acquiring geometric parameter information and material property parameter information of the target workpiece; A three-dimensional model of the target workpiece is constructed based on the geometric parameter information, and the material property parameter information is assigned to the three-dimensional model to obtain the workpiece model.
[0007] In a possible implementation, the controlling of a preset virtual high-power laser welding device based on the welding parameter information to perform welding processing on the finite element model under a variety of laser incident angles includes: Determine multiple laser incident angles in the interval [30°, 90°] with a step size of 1°; For each of the laser incident angles, a preset virtual high-power laser welding device is controlled based on the welding parameter information to perform welding processing on the finite element model at the laser incident angle.
[0008] In a possible implementation, determining the welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each of the finite element units includes: For each of the finite element units, determining a distance value between a first position and a second position corresponding to the finite element unit; determining a standard deviation between each of said distance values; Determine the maximum distance value and the minimum distance value among the distance values; pass Obtain the welding quality coefficient; wherein, is the welding quality coefficient, is the standard deviation, is the weight coefficient corresponding to the standard deviation, is the maximum distance value, is the weight coefficient corresponding to the maximum distance value, is the minimum distance value, is the weight coefficient corresponding to the minimum distance value, and .
[0009] In a possible implementation, constructing a heat source model corresponding to the target workpiece at the target laser incident angle includes: Calculate the surface energy power and volume energy power of the heat transfer model based on the welding parameter information; Determine whether the target laser incident angle is 0°; If yes, determine the first molten pool size of the weld joint; the first molten pool size includes the molten pool top radius, the molten pool bottom radius and the first molten pool depth; Calculate the heat flux density of the circular Gaussian surface heat source model based on the surface energy power and the top surface radius of the molten pool; The heat flux density of the truncated cone heat source model is calculated based on the body energy power and the first molten pool size; the heat flux density of the circular Gaussian surface heat source model and the heat flux density of the truncated cone heat source model constitute the heat source model.
[0010] In a possible implementation, after determining whether the target laser incident angle is 0°, the method further includes: If not, determining a second molten pool size of the weld joint, the second molten pool size comprising an upper ellipse parameter of the molten pool, a lower ellipse parameter of the molten pool, and a second molten pool depth; Calculate the heat flux density of the elliptical Gaussian surface heat source model based on the surface energy power and the ellipse parameters on the molten pool; The heat flux density of the ellipsoidal heat source model is calculated based on the body energy power and the second molten pool size; the heat flux density of the elliptical Gaussian surface heat source model and the heat flux density of the ellipsoidal heat source model constitute the heat source model.
[0011] In a possible implementation, the step of acquiring welding parameter information of the target workpiece in a database based on the material information of the target workpiece includes: Determine the types of materials constituting the target workpiece and the content of each material based on the material information, and count a first number of the types of materials; Arrange the Chinese names of the materials corresponding to each content in order from small to large based on the content to obtain a Chinese character sequence, and count the second number of Chinese characters in the Chinese character sequence; Obtaining the pinyin sequence corresponding to the Chinese character sequence; multiplying the value corresponding to the first quantity by the value corresponding to the second quantity to obtain a first target value; Adding a value corresponding to the first quantity and a value corresponding to the second quantity to obtain a second target value; Obtain a preset encoding algorithm table; the encoding algorithm table is circular, the encoding algorithm table is divided into a plurality of sector-shaped areas, each sector-shaped area is provided with an encoding algorithm, and a rotating pointer is provided on the encoding algorithm table; After the rotating pointer is rotated clockwise from a preset position by an angle corresponding to the first target value, the coding algorithm in the sector-shaped area where the rotating pointer is located is determined to be the target coding algorithm; Based on the target coding algorithm, each letter in the pinyin sequence is encoded in sequence to obtain a coding sequence corresponding to each letter in the pinyin sequence; Arrange the coding sequences in order from top to bottom based on the positions of the letters corresponding to the coding sequences in the pinyin sequence to obtain a coding matrix; Determine a numerical attribute of the second target value; the numerical attribute is an odd number or an even number; Determine the target character in the encoding matrix based on the digital attribute; the digital attribute of the value obtained by multiplying the row number and the column number of the position where the target character is located is consistent with the digital attribute of the second target value; Arrange the target characters in order based on their positions in the encoding matrix to obtain a decryption password; Decryption processing is performed on each encrypted text in the database based on the decryption password, and the successfully decrypted encrypted text is determined as the target text; the target text is provided with the welding parameter information.
[0012] In a second aspect, the present application provides a heat source model construction system for high-power laser autogenous welding, comprising: A construction module, used to construct a workpiece model of a target workpiece, and perform finite element segmentation processing on the workpiece model to obtain a finite element model corresponding to the workpiece model, and for each finite element unit of the finite element model, record a first position of the finite element unit; An acquisition module, used for acquiring welding parameter information of the target workpiece in a database based on the material information of the target workpiece; A control module, for controlling a preset virtual high-power laser welding device to perform welding processing on the finite element model under a plurality of laser incident angles based on the welding parameter information; wherein the laser incident angle is an angle between the laser incident direction and the gravity direction; A first determination module is used for obtaining, for each laser incident angle, a second position of each finite element unit after welding the finite element model at the laser incident angle, and determining a welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each finite element unit; The second determination module is used to determine the laser incident angle corresponding to the maximum welding quality coefficient as the target laser incident angle, and to construct a heat source model corresponding to the target workpiece at the target laser incident angle.
[0013] The present application provides a method and system for constructing a heat source model for high-power laser self-melting welding, the method comprising: constructing a workpiece model of a target workpiece, performing finite element segmentation processing on the workpiece model to obtain a finite element model corresponding to the workpiece model, and recording the first position of each finite element unit of the finite element model; obtaining welding parameter information of the target workpiece in a database based on the material information of the target workpiece; controlling a preset virtual high-power laser welding device to perform welding processing on the finite element model at multiple laser incident angles based on the welding parameter information; wherein the laser incident angle is the angle between the laser incident direction and the gravity direction; for each of the laser incident angles, after the finite element model is welded at the laser incident angle, obtaining the second position of each of the finite element units, and determining the welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each of the finite element units; determining the laser incident angle corresponding to the maximum welding quality coefficient as the target laser incident angle, and constructing a heat source model corresponding to the target workpiece at the target laser incident angle. The method performs welding on the finite element model at a variety of laser incident angles, calculates the welding quality coefficient corresponding to each laser incident angle, determines the optimal laser incident angle based on the welding quality coefficient corresponding to each of the laser incident angles, and constructs a heat source model based on the optimal laser incident angle. On the one hand, it helps to optimize the laser welding parameters and thus improve the welding quality. On the other hand, it can obtain a high-quality heat source model, providing a high-quality data basis for the subsequent analysis of the temperature field, stress field, and the time and spatial distribution of the molten pool flow and its evolution law. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.
[0015] Figure 1 A schematic diagram of a process for constructing a heat source model for high-power laser autogenous welding provided in an embodiment of the present application; Figure 2 A schematic block diagram of the structure of a heat source model building system for high-power laser autogenous welding provided in an embodiment of the present application. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0017] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.
[0018] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
[0019] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0020] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0021] See also Figure 1 , Figure 1 A schematic diagram of a heat source model construction method for high-power laser self-melting welding provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the method for constructing a heat source model for high-power laser autogenous welding provided in the embodiment of the present application includes steps S1 to S5.
[0022] Step S1: construct a workpiece model of a target workpiece, and perform finite element segmentation processing on the workpiece model to obtain a finite element model corresponding to the workpiece model, and for each finite element unit of the finite element model, record a first position of the finite element unit.
[0023] The step of constructing the target artifact model comprises the following steps: Acquire geometric parameter information and material property parameter information of the target workpiece; specifically, acquire the geometric parameter information and the material property parameter information from production specification information of the target workpiece, wherein the material property parameter information includes material information, thermal conductivity, specific heat capacity, thermal expansion coefficient, latent heat of melting, latent heat of evaporation and other material property parameters of the target workpiece; A three-dimensional model of the target workpiece is constructed based on the geometric parameter information, and the material property parameter information is assigned to the three-dimensional model to obtain the workpiece model; specifically, the three-dimensional model of the target workpiece is constructed by CAD software.
[0024] Wherein, for each finite element unit of the finite element model, recording the first position of the finite element unit includes: Constructing a spatial rectangular coordinate system with any point on the finite element model as the coordinate origin; For each finite element unit of the finite element model, a coordinate point corresponding to a center point of the finite element unit in the spatial rectangular coordinate system is determined as a first position of the finite element unit.
[0025] Step S2: acquiring welding parameter information of the target workpiece in a database based on the material information of the target workpiece.
[0026] Among them, a matching relationship between various material information and its corresponding welding parameter information is set in the database, and a search is performed in the database based on the material information to obtain the welding parameter information of the target workpiece. The welding parameter information includes laser power, welding speed, focal position, and type and flow rate of shielding gas. The welding parameter information is optimal welding parameter information corresponding to the material information obtained through experiments. The welding parameter information is used to weld the target workpiece and produces the least porosity defects.
[0027] Step S3, based on the welding parameter information, controlling a preset virtual high-power laser welding device to perform welding processing on the finite element model under a variety of laser incident angles; wherein the laser incident angle is the angle between the laser incident direction and the gravity direction.
[0028] Specifically, step S3 includes the following steps: Determine multiple laser incident angles in the interval [30°, 90°] with a step size of 1°; For each of the laser incident angles, the preset virtual high-power laser welding equipment is controlled based on the welding parameter information to perform welding processing on the finite element model at the laser incident angle; specifically, the weld on the finite element model is placed in a horizontal position, and the virtual high-power laser welding equipment is controlled to generate a laser based on the welding parameter information to be incident on the weld on the finite element model at the laser incident angle, so as to perform welding processing on the weld on the finite element model.
[0029] It can be understood that step S3 can fully explore and evaluate the influence of different angles on welding quality by finely adjusting the laser incident angle in the interval [30°, 90°] with a step size of 1°. This method helps to find the best laser incident angle, thereby optimizing welding process parameters and improving welding quality.
[0030] Step S4: for each of the laser incident angles, after welding the finite element model at the laser incident angle, obtain the second position of each of the finite element units, and determine the welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each of the finite element units.
[0031] Specifically, after the finite element model is welded at the laser incident angle, for each of the finite element units, a coordinate point corresponding to the center point of the finite element unit in the spatial rectangular coordinate system is determined as the second position of the finite element unit, and the welding quality coefficient corresponding to the laser incident angle is determined based on the first position and the second position of each of the finite element units, including the following steps: For each of the finite element units, determining a distance value between a first position and a second position corresponding to the finite element unit; determining a standard deviation between each of said distance values; Determine the maximum distance value and the minimum distance value among the distance values; pass Obtain the welding quality coefficient; wherein, is the welding quality coefficient, is the standard deviation, is the weight coefficient corresponding to the standard deviation, is the maximum distance value, is the weight coefficient corresponding to the maximum distance value, is the minimum distance value, is the weight coefficient corresponding to the minimum distance value, and .
[0032] It can be understood that step S4 analyzes the position changes of each finite element unit before and after welding, and Obtaining the welding quality coefficient provides a scientific basis for the quantitative evaluation of welding quality. It not only takes into account the deformation amplitude (maximum distance value and minimum distance value) of the finite element unit during the welding process, but also analyzes the uniformity of deformation through standard deviation. This multi-dimensional comprehensive measurement method can comprehensively examine the welding quality, improve the accuracy of the welding quality coefficient, and thus help to build a heat source model with high reliability.
[0033] Step S5, determining the laser incident angle corresponding to the maximum welding quality coefficient as the target laser incident angle, and constructing a heat source model corresponding to the target workpiece at the target laser incident angle.
[0034] Specifically, the step of constructing a heat source model corresponding to the target workpiece at the target laser incident angle includes the following steps: The surface energy power and volume energy power of the heat transfer model are calculated based on the welding parameter information; specifically, by Obtain the surface energy power by The body energy power is obtained, wherein: is the surface energy power, is the ratio coefficient of surface energy power to total energy power, is the energy absorption coefficient of the target workpiece to the laser, is the laser power, is the body energy power, obtained through the welding parameter information , and ; Determine whether the target laser incident angle is 0°; If the target laser incident angle is 0°, determine the first molten pool size of the weld joint; the first molten pool size includes the molten pool top surface radius, the molten pool bottom surface radius and the first molten pool depth; specifically, measure the weld obtained by welding the finite element model at the target laser incident angle, determine that half of the weld top surface width is the molten pool top surface radius, half of the weld bottom surface width is the molten pool bottom surface radius, and the weld depth is the first molten pool depth; The heat flux density of the circular Gaussian surface heat source model is calculated based on the surface energy power and the top radius of the molten pool; it can be understood that when the target laser incident angle is 0°, the Gaussian surface corresponding to the molten pool is circular. Specifically, by Calculate the heat flux density of the circular Gaussian surface heat source model, where represents the heat flux density at any point in the circular Gaussian surface, represents the radius of the top surface of the molten pool, Indicate point The distance to the center of the circular Gaussian surface; The heat flux density of the truncated cone heat source model is calculated based on the body energy power and the first molten pool size; the heat flux density of the circular Gaussian surface heat source model and the heat flux density of the truncated cone heat source model constitute the heat source model; it can be understood that when the target laser incident angle is 0°, the molten pool is a truncated cone, specifically, by Calculate the heat flux density of the truncated cone heat source model, where express Any point in the circular plane The heat flux density, express The radius of the circular plane, express Any point in the circular plane arrive The distance from the center of the circular plane, Represents the volume of the truncated cone, which is obtained by the first molten pool size and truncated cone volume calculation formula ; If the target laser incident angle is not 0°, determine the second molten pool size of the weld joint, the second molten pool size includes the upper ellipse parameters, the lower ellipse parameters and the second molten pool depth; wherein the upper ellipse parameters include the upper ellipse major semi-axis and the upper ellipse minor semi-axis, and the lower ellipse parameters include the lower ellipse major semi-axis and the lower ellipse minor semi-axis. Specifically, measure the weld obtained by welding the finite element model at the target laser incident angle, determine that half of the top surface width of the weld is the upper ellipse minor semi-axis, determine that the ratio of the upper ellipse minor semi-axis to the cosine value of the target laser incident angle is the upper ellipse major semi-axis, determine that half of the bottom surface width of the weld is the lower ellipse minor semi-axis, determine that the ratio of the lower ellipse minor semi-axis to the cosine value of the target laser incident angle is the lower ellipse major semi-axis, and determine that the ratio of the weld depth to the cosine value of the target laser incident angle is the second molten pool depth; The heat flux density of the elliptical Gaussian surface heat source model is calculated based on the surface energy power and the elliptical parameters on the molten pool; it can be understood that when the target laser incident angle is not 0°, the Gaussian surface corresponding to the molten pool is an ellipse. Specifically, by Calculate the heat flux density of the elliptical Gaussian surface heat source model, where represents the heat flux density at any point within the elliptical Gaussian surface, is the minor semi-axis of the upper ellipse, is the cosine value of the target laser incident angle, Indicate point The distance to the center of the elliptical Gaussian surface, For point The distance from the intersection of the radial extension line of the center of the elliptical Gaussian surface and the boundary line of the elliptical Gaussian surface to the center of the elliptical Gaussian surface; The heat flux density of the elliptical cone heat source model is calculated based on the body energy power and the second molten pool size; the heat flux density of the elliptical Gaussian surface heat source model and the heat flux density of the elliptical cone heat source model constitute the heat source model; it can be understood that when the target laser incident angle is not 0°, the molten pool is an elliptical cone, and the .... ,in, express Any point in the elliptical plane The heat flux density, express and The radial extension line of the center of the elliptical plane is The intersection of the ellipse plane boundary to The distance from the center of the ellipse plane, express Any point in the elliptical plane arrive The distance from the center of the ellipse plane, Represents the volume of the ellipse, which is obtained by the second melt pool size and ellipse volume calculation formula .
[0035] The method provided in the embodiment of the present application performs welding processing on the finite element model at a variety of laser incident angles, calculates the welding quality coefficient corresponding to each laser incident angle, and determines the optimal laser incident angle based on the welding quality coefficient corresponding to each of the laser incident angles, and constructs a heat source model based on the optimal laser incident angle. On the one hand, it helps to optimize the laser welding parameters and thus improve the welding quality. On the other hand, it can obtain a high-quality heat source model, providing a high-quality data basis for the subsequent analysis of the temperature field, stress field, and the time and spatial distribution of the molten pool flow and its evolution law.
[0036] In some embodiments, the acquiring welding parameter information of the target workpiece in a database based on the material information of the target workpiece comprises the following steps: Determine the types of materials constituting the target workpiece and the content of each material based on the material information, and count a first number of the types of materials; Arrange the Chinese names of the materials corresponding to each content in order from small to large based on the content to obtain a Chinese character sequence, and count the second number of Chinese characters in the Chinese character sequence; Obtaining the pinyin sequence corresponding to the Chinese character sequence; multiplying the value corresponding to the first quantity by the value corresponding to the second quantity to obtain a first target value; Adding a value corresponding to the first quantity and a value corresponding to the second quantity to obtain a second target value; Obtain a preset encoding algorithm table; the encoding algorithm table is circular, the encoding algorithm table is divided into a plurality of sector-shaped areas, each sector-shaped area is provided with an encoding algorithm, and a rotating pointer is provided on the encoding algorithm table; After the rotating pointer is rotated clockwise from a preset position by an angle corresponding to the first target value, the coding algorithm in the sector-shaped area where the rotating pointer is located is determined to be the target coding algorithm; Based on the target coding algorithm, each letter in the pinyin sequence is encoded in sequence to obtain a coding sequence corresponding to each letter in the pinyin sequence; Arrange the coding sequences in order from top to bottom based on the positions of the letters corresponding to the coding sequences in the pinyin sequence to obtain a coding matrix; Determine a numerical attribute of the second target value; the numerical attribute is an odd number or an even number; Determine the target character in the encoding matrix based on the digital attribute; the digital attribute of the value obtained by multiplying the row number and the column number of the position where the target character is located is consistent with the digital attribute of the second target value; Arrange the target characters in order based on their positions in the encoding matrix to obtain a decryption password; Decryption processing is performed on each encrypted text in the database based on the decryption password, and the successfully decrypted encrypted text is determined as the target text; the target text is provided with the welding parameter information.
[0037] The method provided in this embodiment can, on the one hand, ensure the security of the welding parameter information of the target workpiece, prevent the welding parameter information from being tampered with by unauthorized personnel, and ensure the welding quality of the target workpiece. On the other hand, the method of obtaining the decryption password in this embodiment increases the difficulty of cracking the password, and further improves the security of the welding parameter information of the target workpiece.
[0038] See also Figure 2 , Figure 2 The schematic block diagram of the structure of the heat source model construction system 100 for high-power laser self-melting welding provided in the embodiment of the present application is as follows: Figure 2 As shown, the heat source model construction system 100 for high-power laser autogenous welding provided in the embodiment of the present application includes: The construction module 110 is used to construct a workpiece model of the target workpiece, and perform finite element segmentation processing on the workpiece model to obtain a finite element model corresponding to the workpiece model, and for each finite element unit of the finite element model, record the first position of the finite element unit.
[0039] The acquisition module 120 is used to acquire the welding parameter information of the target workpiece in a database based on the material information of the target workpiece.
[0040] The control module 130 is used to control the preset virtual high-power laser welding equipment to perform welding processing on the finite element model under multiple laser incident angles based on the welding parameter information; wherein the laser incident angle is the angle between the laser incident direction and the gravity direction.
[0041] The first determination module 140 is used to obtain the second position of each of the finite element units for each of the laser incident angles after the finite element model is welded at the laser incident angle, and determine the welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each of the finite element units.
[0042] The second determination module 150 is used to determine the laser incident angle corresponding to the maximum welding quality coefficient as the target laser incident angle, and construct a heat source model corresponding to the target workpiece at the target laser incident angle.
[0043] It should be noted that, those skilled in the art can clearly understand that, for the sake of convenience and conciseness of description, the specific working process of the system and each module described above can refer to the process in the aforementioned high-power laser self-melting welding heat source model construction method embodiment, and will not be repeated here.
[0044] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A method for constructing a heat source model for high-power laser self-melting welding, characterized in that: include: Constructing a workpiece model of a target workpiece, and performing finite element segmentation processing on the workpiece model to obtain a finite element model corresponding to the workpiece model, and for each finite element unit of the finite element model, recording a first position of the finite element unit; Acquiring welding parameter information of the target workpiece in a database based on the material information of the target workpiece; Based on the welding parameter information, a preset virtual high-power laser welding device is controlled to perform welding processing on the finite element model under a variety of laser incident angles; wherein the laser incident angle is the angle between the laser incident direction and the gravity direction; For each of the laser incident angles, after welding the finite element model at the laser incident angle, obtaining a second position of each of the finite element units, and determining a welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each of the finite element units; The laser incident angle corresponding to the maximum welding quality coefficient is determined as the target laser incident angle, and a heat source model corresponding to the target workpiece at the target laser incident angle is constructed.
2. The method for constructing a heat source model for high-power laser self-melting welding according to claim 1, characterized in that: The artifact model of the target artifact is constructed, including: Acquiring geometric parameter information and material property parameter information of the target workpiece; A three-dimensional model of the target workpiece is constructed based on the geometric parameter information, and the material property parameter information is assigned to the three-dimensional model to obtain the workpiece model.
3. The method for constructing a heat source model for high-power laser self-melting welding according to claim 1, characterized in that: The method of controlling the preset virtual high-power laser welding equipment based on the welding parameter information to perform welding processing on the finite element model under a variety of laser incident angles includes: Determine multiple laser incident angles in the interval [30°, 90°] with a step size of 1°; For each of the laser incident angles, a preset virtual high-power laser welding device is controlled based on the welding parameter information to perform welding processing on the finite element model at the laser incident angle.
4. The method for constructing a heat source model for high-power laser self-melting welding according to claim 1, characterized in that: The step of determining the welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each of the finite element units comprises: For each of the finite element units, determining a distance value between a first position and a second position corresponding to the finite element unit; determining a standard deviation between each of said distance values; Determine the maximum distance value and the minimum distance value among the distance values; pass Obtain the welding quality coefficient; wherein, is the welding quality coefficient, is the standard deviation, is the weight coefficient corresponding to the standard deviation, is the maximum distance value, is the weight coefficient corresponding to the maximum distance value, is the minimum distance value, is the weight coefficient corresponding to the minimum distance value, and .
5. The method for constructing a heat source model for high-power laser self-melting welding according to claim 1, characterized in that: The step of constructing a heat source model corresponding to the target workpiece at the target laser incident angle includes: Calculate the surface energy power and volume energy power of the heat transfer model based on the welding parameter information; Determine whether the target laser incident angle is 0°; If yes, determine the first molten pool size of the weld joint; the first molten pool size includes the molten pool top radius, the molten pool bottom radius and the first molten pool depth; Calculate the heat flux density of the circular Gaussian surface heat source model based on the surface energy power and the top surface radius of the molten pool; The heat flux density of the truncated cone heat source model is calculated based on the body energy power and the first molten pool size; the heat flux density of the circular Gaussian surface heat source model and the heat flux density of the truncated cone heat source model constitute the heat source model.
6. The method for constructing a heat source model for high-power laser self-melting welding according to claim 5, characterized in that: After determining whether the target laser incident angle is 0°, the method further includes: If not, determining a second molten pool size of the weld joint, the second molten pool size comprising an upper ellipse parameter of the molten pool, a lower ellipse parameter of the molten pool, and a second molten pool depth; Calculate the heat flux density of the elliptical Gaussian surface heat source model based on the surface energy power and the ellipse parameters on the molten pool; The heat flux density of the ellipsoidal heat source model is calculated based on the body energy power and the second molten pool size; the heat flux density of the elliptical Gaussian surface heat source model and the heat flux density of the ellipsoidal heat source model constitute the heat source model.
7. The method for constructing a heat source model for high-power laser self-melting welding according to claim 1, characterized in that: The step of acquiring welding parameter information of the target workpiece in a database based on the material information of the target workpiece includes: Determine the types of materials constituting the target workpiece and the content of each material based on the material information, and count a first number of the types of materials; Arrange the Chinese names of the materials corresponding to each content in order from small to large based on the content to obtain a Chinese character sequence, and count the second number of Chinese characters in the Chinese character sequence; Obtaining the pinyin sequence corresponding to the Chinese character sequence; multiplying the value corresponding to the first quantity by the value corresponding to the second quantity to obtain a first target value; Adding a value corresponding to the first quantity and a value corresponding to the second quantity to obtain a second target value; Obtain a preset encoding algorithm table; the encoding algorithm table is circular, the encoding algorithm table is divided into a plurality of sector-shaped areas, each sector-shaped area is provided with an encoding algorithm, and a rotating pointer is provided on the encoding algorithm table; After the rotating pointer is rotated clockwise from a preset position by an angle corresponding to the first target value, the coding algorithm in the sector-shaped area where the rotating pointer is located is determined to be the target coding algorithm; Based on the target coding algorithm, each letter in the pinyin sequence is encoded in sequence to obtain a coding sequence corresponding to each letter in the pinyin sequence; Arrange the coding sequences in order from top to bottom based on the positions of the letters corresponding to the coding sequences in the pinyin sequence to obtain a coding matrix; Determine a numerical attribute of the second target value; the numerical attribute is an odd number or an even number; Determine the target character in the encoding matrix based on the digital attribute; the digital attribute of the value obtained by multiplying the row number and the column number of the position where the target character is located is consistent with the digital attribute of the second target value; Arrange the target characters in order based on their positions in the encoding matrix to obtain a decryption password; Decryption processing is performed on each encrypted text in the database based on the decryption password, and the successfully decrypted encrypted text is determined as the target text; the target text is provided with the welding parameter information.
8. A heat source model construction system for high-power laser self-melting welding, characterized in that: include: A construction module, used to construct a workpiece model of a target workpiece, and perform finite element segmentation processing on the workpiece model to obtain a finite element model corresponding to the workpiece model, and for each finite element unit of the finite element model, record a first position of the finite element unit; An acquisition module, used for acquiring welding parameter information of the target workpiece in a database based on the material information of the target workpiece; A control module, for controlling a preset virtual high-power laser welding device to perform welding processing on the finite element model under a plurality of laser incident angles based on the welding parameter information; wherein the laser incident angle is an angle between the laser incident direction and the gravity direction; A first determination module is used for obtaining, for each laser incident angle, a second position of each finite element unit after welding the finite element model at the laser incident angle, and determining a welding quality coefficient corresponding to the laser incident angle based on the first position and the second position of each finite element unit; The second determination module is used to determine the laser incident angle corresponding to the maximum welding quality coefficient as the target laser incident angle, and to construct a heat source model corresponding to the target workpiece at the target laser incident angle.