Electro-gas welding temperature field simulation method and device, terminal and storage medium

Abstract

The invention relates to the technical field of welding, and discloses an electro-gas welding temperature field simulation method and device, a terminal and a storage medium, and the method comprises the following steps: calculating thermophysical parameters of base metal changing along with the temperature, and calculating the heat flux density of the contact surface of a welding pool and a water-cooling copper sliding block according to the parameters of cooling liquid and the temperature difference; wherein the temperature difference is the difference between the temperature of the cooling liquid at the room temperature and the temperature of the cooling liquid passing through the welding pool; a heat source shape three-dimensional model is constructed, the heat flow density serves as an additional load of the heat source shape three-dimensional model, and a body heat source is applied to the heat source shape three-dimensional model according to the heat source function; simulating the heat source shape three-dimensional model after the additional load and the body heat source are applied in combination with the thermophysical parameters so as to obtain a simulated temperature field; and if the simulated temperature field is not matched with the weld metal morphology, modifying the heat source function until the simulated temperature field is matched with the weld metal morphology. The temperature field simulated by the method is more accurate.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a method, device, terminal and storage medium for simulating a temperature field of gas-electric vertical welding. Background Art

[0002] Since gas-electric vertical welding has the characteristics of high welding efficiency and low cost, it is widely used in fields such as shipbuilding and marine engineering. Compared with traditional gas shielded welding and manual arc welding, its welding process is often accompanied by a larger welding heat input, and it can weld through medium and thick plate steel in one go. However, the peak temperature of the thermal cycle experienced by the parent material and the molten pool under high heat input is relatively high, which requires the use of a movable water-cooled copper slider to assist in cooling the molten pool so that the weld metal solidifies in time and avoids coarse room temperature structure after welding. In order to facilitate the regulation of the microstructure of the weld metal, it is necessary to understand the temperature distribution state of the weld. In the existing technology, although the infrared scanning measurement equipment can directly measure the temperature of the molten pool surface, there is a certain time lag and error between the measured data and the actual temperature change, and it is impossible to measure the temperature inside the molten pool. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a method, device, terminal and storage medium for simulating the temperature field of gas-electric vertical welding, so that the simulated temperature field of gas-electric vertical welding is more consistent with the actual welding situation.

[0004] In a first aspect, an embodiment of the present application provides a method for simulating a temperature field of gas-electric vertical welding, comprising:

[0005] Obtaining a temperature difference of the coolant; wherein the temperature difference is obtained based on the temperature of the coolant at room temperature and the temperature of the coolant after passing through the welding molten pool;

[0006] Calculating the thermophysical parameters of the base material as it changes with temperature, and calculating the heat flux density of the contact surface between the welding pool and the water-cooled copper slider according to the parameters of the coolant and the temperature difference;

[0007] Constructing a three-dimensional model of a heat source shape, using the heat flux density as an additional load of the three-dimensional model of the heat source shape, and applying a body heat source to the three-dimensional model of the heat source shape according to a heat source function;

[0008] Combining the thermophysical parameters, simulating the three-dimensional model of the heat source shape after the additional load and the application of the body heat source to obtain a simulated temperature field;

[0009] If the simulated temperature field does not match the weld metal morphology, the heat source function is modified until the simulated temperature field matches the weld metal morphology.

[0010] In some embodiments, the heat source function includes a heat source shape function and a heat source path function;

[0011] The heat source shape function is a double ellipsoid heat source function;

[0012] The heat source path function is a sinusoidal function.

[0013] In some embodiments, the heat source shape function is:

[0014]

[0015] in,

[0016] Among them, q f (x, y, z) is the heat source function of the first half of the ellipsoid; q r (x, y, z) is the ellipsoid heat source function in the second half; U is the welding voltage; I is the welding current; v is the welding speed; η is the welding efficiency; t is the time, p1(t) is the position of the heat source at time t, a f , b, c are the radii of the front half of the ellipsoid in the x, y, and z directions respectively, a r , b, c are the radii of the rear half of the ellipsoid in the x, y, and z directions respectively.

[0017] In some embodiments, the heat source path function is:

[0018]

[0019] Among them, A is the amplitude of the heat source; t is the time; T is the period; K is a constant.

[0020] In some embodiments, modifying the heat source function comprises:

[0021] The welding voltage, the welding current, the welding speed and / or the radius of the ellipsoid in the x, y and z directions in the heat source function are modified.

[0022] In some embodiments, the step of calculating the heat flux density of the contact surface between the welding molten pool and the water-cooled copper slider according to the parameters of the coolant and the temperature difference includes:

[0023] The heat flux density is calculated according to the specific heat capacity of the coolant, the mass of the coolant flowing per unit time, the contact area between the water-cooled copper slider and the welding molten pool, and the temperature difference.

[0024] In some embodiments, the step of calculating the thermal physical property parameters of the base material as it changes with temperature includes:

[0025] According to the preset temperature interval, multiple thermophysical parameters of the base material between the current indoor temperature and the boiling point temperature of the welding pool are calculated.

[0026] In a second aspect, an embodiment of the present application provides a gas-electric vertical welding temperature field simulation device, comprising:

[0027] An acquisition module, used to acquire a temperature difference of the coolant; wherein the temperature difference is obtained based on the temperature of the coolant at room temperature and the temperature of the coolant after passing through the welding molten pool;

[0028] A calculation module, used to calculate the thermophysical parameters of the base material as it changes with temperature, and to calculate the heat flux density of the contact surface between the welding pool and the water-cooled copper slider according to the parameters of the coolant and the temperature difference;

[0029] A construction module, used for constructing a three-dimensional model of a heat source shape, taking the heat flux density as an additional load of the three-dimensional model of the heat source shape, and applying a body heat source to the three-dimensional model of the heat source shape according to a heat source function;

[0030] A simulation module, for simulating the three-dimensional model of the heat source shape after the additional load and the application of the body heat source in combination with the thermophysical property parameters, so as to obtain a simulated temperature field;

[0031] The judgment module is used to modify the heat source function until the simulated temperature field matches the weld metal morphology if the simulated temperature field does not match the weld metal morphology.

[0032] In a third aspect, an embodiment of the present application provides a terminal device, which includes a processor and a memory, wherein the memory stores a computer program, and the processor is used to execute the computer program to implement the above-mentioned gas-electric vertical welding temperature field simulation method.

[0033] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, which, when executed on a processor, implements the above-mentioned gas-electric vertical welding temperature field simulation method.

[0034] The embodiments of the present application have the following beneficial effects:

[0035] When simulating the temperature field of gas-electric vertical welding, the embodiment of the present application obtains the temperature difference between the coolant at room temperature and after passing through the welding pool, and then calculates a more accurate heat flux density. In this embodiment, the heat flux density is used as an additional load of the three-dimensional model of the heat source shape, which makes the boundary conditions of the three-dimensional model more in line with the actual situation, thereby making the final simulated temperature field more accurate, which can better reflect the temperature distribution of the gas-electric vertical welding joint and has a higher degree of fit with the morphology of the welding joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A first schematic diagram of a process for simulating a temperature field of gas-electric vertical welding according to an embodiment of the present application is shown;

[0038] Figure 2 A schematic diagram of the structure of measuring the temperature difference of the gas-electric welding coolant according to an embodiment of the present application is shown;

[0039] Figure 3 A schematic diagram of the heat source movement path of an embodiment of the present application is shown;

[0040] Figure 4 The heat source shape and the schematic diagram of the three-dimensional model according to the welding position of the embodiment of the present application are shown;

[0041] Figure 5 A second flow chart of the gas-electric vertical welding temperature field simulation method according to an embodiment of the present application is shown;

[0042] Figure 6 A schematic diagram showing the simulated temperature field and actual weld metal morphology of an embodiment of the present application is shown;

[0043] Figure 7 A schematic diagram of mesh division of a three-dimensional model according to an embodiment of the present application is shown;

[0044] Figure 8 A structural schematic diagram of a gas-electric vertical welding temperature field simulation device according to an embodiment of the present application is shown.

[0045] 1-base material; 2-coolant tank; 3-thermocouple; 4-welding pool; 5-water-cooled copper slider; 6-water pipe; 7-drain pipe; 100-acquisition module; 200-calculation module; 300-construction module; 400-simulation module; 500-judgment module. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0047] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0048] Hereinafter, the terms "including", "having" and their cognates that can be used in various embodiments of the present application are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or increasing the possibility of one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0049] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0050] 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.

[0051] In the prior art, although the infrared scanning measurement equipment can directly measure the temperature of the molten pool surface, there is a certain time lag and error between the measured data and the actual temperature change, and the temperature inside the molten pool cannot be measured. Therefore, in order to accurately obtain the temperature distribution of the gas-electric vertical welding weld, this application proposes a gas-electric vertical welding temperature field simulation method. By obtaining the temperature difference between the coolant at room temperature and after passing through the welding molten pool, a more accurate heat flux density is calculated, and the heat flux density is used as an additional load of the three-dimensional model of the heat source shape, which makes the boundary conditions of the three-dimensional model more in line with the actual situation, and thus makes the final simulated temperature field more accurate, which can better reflect the temperature distribution of the gas-electric vertical welding joint, and has a higher degree of fit with the morphology of the welding joint.

[0052] The gas-electrode vertical welding temperature field simulation method is described below in conjunction with some specific embodiments.

[0053] Figure 1 A schematic flow chart of a method for simulating a temperature field of gas-electric vertical welding according to an embodiment of the present application is shown. Exemplarily, the method for simulating a temperature field of gas-electric vertical welding comprises the following steps:

[0054] Step S100, obtaining the temperature difference of the coolant.

[0055] Since the molten pool volume of gas-electric vertical welding is relatively small, the heat dissipated by the welding pool 4 is mainly taken away by the circulating coolant. Therefore, in order to make the simulated welding temperature field more accurate, this embodiment first measures the temperature difference of the coolant, and then calculates the heat flux density of the contact surface between the water-cooled copper slider and the welding pool 4 based on the parameters of the coolant combined with the temperature difference of the coolant.

[0056] It can be understood that this embodiment first measures the temperature difference of the coolant, thereby making the calculated heat flux density more accurate; further, in the subsequent simulation of the temperature field, the calculated heat flux density is used as the intensity distribution of the heat source, and the load is added to the three-dimensional model of the heat source shape, which will also make the final simulated temperature field more accurate.

[0057] For example, Figure 2 The figure shows a schematic diagram of the structure of a device for measuring the temperature difference of the cooling liquid in gas-electric welding. Figure 2 As shown, the parent material 1 is a metal material to be welded, the water-cooled copper slider 5 is arranged at the groove of the welding joint, the inlet of the coolant water pipe 6 extends into the coolant water tank 2 and into the coolant, the outlet of the coolant drain pipe 7 does not contact the coolant, the coolant water pipe 6 and the drain pipe 7 form a water-cooled circulation pipeline for the coolant, and the water-cooled circulation pipeline passes through the welding molten pool 4. In this embodiment, when measuring the temperature difference of the coolant, the thermocouple 3 is first used to measure the temperature of the coolant at room temperature, and then the thermocouple 3 is used to measure the temperature of the coolant at the outlet of the drain pipe 7 after the coolant passes through the welding molten pool 4, and then the temperature difference of the coolant is calculated. Among them, the thermocouple 3 used when measuring the temperature of the coolant can be a K-type thermocouple.

[0058] Step S200, calculating the thermophysical parameters of the base material as it changes with temperature, and calculating the heat flux density of the contact surface between the welding molten pool and the water-cooled copper slider according to the parameters of the coolant and the temperature difference.

[0059] In some embodiments, calculating the thermophysical parameters of the base material 1 as it changes with temperature includes: calculating multiple thermophysical parameters of the base material 1 between the current indoor temperature and the boiling point temperature of the welding pool 4 according to a preset temperature interval. It can be understood that the thermophysical parameters include thermal conductivity, specific heat capacity, latent heat and density, etc.; wherein, the thermal conductivity describes the ability of the welded metal material to transfer heat. During the welding process, the thermal conductivity of the weld metal and other materials determines how the heat is transferred from the high temperature area to the low temperature area; the specific heat capacity indicates the energy required for the material to heat up. Materials with high specific heat capacity require more energy to raise the same temperature, so they will have a larger temperature change during heating and cooling; the density affects the mass and volume of the material, and thus affects the transfer and distribution of heat during welding; latent heat refers to the energy absorbed or released by a substance during phase change.

[0060] Since the thermophysical parameters directly affect key factors such as heat transfer, material deformation and cooling rate during welding, the thermophysical parameters are very important in the simulation of welding temperature field. In this embodiment, the preset interval temperature of the parent material 1 (welding metal) is determined according to the boiling point temperature of the welding molten pool 4. The preset interval temperature can be set to 200 degrees Celsius, 100 degrees Celsius, 300 degrees Celsius or 50 degrees Celsius, etc. Of course, the smaller the preset interval temperature, the more accurate the simulation result of the temperature field. In this embodiment, the thermophysical parameters of the welding metal at each temperature can be calculated by JmatPro software.

[0061] In some embodiments, the heat flux density of the contact surface between the welding molten pool 4 and the water-cooled copper slider 5 is calculated based on the parameters of the coolant and the temperature difference, including: calculating the heat flux density based on the specific heat capacity of the coolant, the mass of the coolant flowing per unit time, the contact area between the water-cooled copper slider and the welding molten pool, and the temperature difference.

[0062] In this embodiment, the heat flux density is obtained, and when the temperature field is subsequently simulated, the obtained heat flux density can be applied to the three-dimensional model of the heat source shape as a boundary condition, which can more realistically simulate the temperature change during the welding process.

[0063] The calculation formula of heat flux is:

[0064]

[0065] In the formula, q copper is the heat flux density, c is the specific heat capacity of the coolant, is the mass of coolant passing through the water pipe per unit time, S is the contact area between the water-cooled copper slider and the welding molten pool, and ΔT is the temperature difference of the coolant before and after welding; among which, the specific heat capacity of the coolant can be obtained by looking up the table after determining the coolant to be used.

[0066] Step S300, constructing a three-dimensional model of the heat source shape, taking the heat flux density as an additional load of the three-dimensional model of the heat source shape, and applying a body heat source to the three-dimensional model of the heat source shape according to a heat source function.

[0067] In this embodiment, a three-dimensional geometric model of the heat source shape is created by ABAQUS software. For the heat source model in the welding process, it is first necessary to construct a model of the welding area (such as weld metal, water-cooled copper slider 5, etc.) through the software, and then use the heat flux density calculated above as an additional load for the three-dimensional model of the heat source shape, that is, in establishing the three-dimensional model of the heat source shape, the intensity distribution of the heat source is adjusted by the calculated heat flux density, so as to more accurately simulate the welding temperature field; in addition, when applying a body heat source to the heat source shape unit model through ABAQUS software, it is necessary to apply it in combination with the heat source function set in advance through the subroutine, wherein the body heat source is a Gaussian heat source.

[0068] Among them, the heat source function includes a heat source shape function and a heat source path function; the heat source shape function is a double ellipsoid heat source function; and the heat source path function is a sine function.

[0069] Since this embodiment is used to simulate the temperature field of gas-electric vertical welding, Figure 3 As shown, for gas-electric vertical welding, the welding path is a path from bottom to top, and the movement of the welding wire is not a straight line, but a path according to a sine function. In order to restore the actual situation of the swinging movement of the welding wire, the heat source path in this embodiment adopts a sine function, which can more accurately simulate the movement path of the welding wire (heat source). Specifically, the heat source path function of this embodiment is:

[0070]

[0071] Among them, A is the amplitude of the heat source (which can be understood as the beating amplitude of the wire feeding gun); t is time; T is the period; K is a constant; wherein, the period T can be determined according to the welding speed, such as a period T can be defined as 8 seconds, 10 seconds, etc., and the constant K can be set to 0.

[0072] In some embodiments, the heat source shape function is:

[0073]

[0074] in, Among them, q f (x, y, z) is the heat source function of the first half of the ellipsoid; q r (x, y, z) is the ellipsoid heat source function in the second half; U is the welding voltage; I is the welding current; v is the welding speed; η is the welding efficiency; t is the time, p1(t) is the position of the heat source at time t, a f, b, c are the radii of the front half of the ellipsoid in the x, y, and z directions respectively, a r , b, c are the radii of the front half ellipsoid in the x, y, and z directions, respectively. It should be noted that in the heat source function of the present application, the values ​​of b and c of the heat source function of the front half ellipsoid are the same as those of b and c of the heat source function of the back half ellipsoid; f Set to 15, a r Set a to 9, b and c to 12.

[0075] like Figure 4 As shown in the figure, the heat source shape and the three-dimensional model according to the welding position are shown. According to the heat source shape function, when constructing the three-dimensional model, the heat source shape function of this embodiment indicates the heat flux density of the double ellipsoid heat source in the three-dimensional space with different positions. The three-dimensional model mainly adopts the birth and death unit method. First, part of the weld metal is eliminated, and the eliminated units are activated step by step over time by establishing multiple analysis steps of the same step length to restore the process of weld metal formation; and when constructing the three-dimensional model, the moving path of the welding wire is also combined, so that the constructed model is further made more in line with the actual situation.

[0076] Step S400 , combining the thermophysical parameters, simulating the three-dimensional model of the heat source shape after the additional load and the application of the body heat source, to obtain a simulated temperature field.

[0077] When obtaining the simulated temperature field, in order to make the simulated temperature field closer to the actual situation, when using ABAQUS software to simulate the welding temperature field, it is necessary to combine the thermophysical property parameters obtained by the above calculation and assign the thermophysical property parameters to the corresponding materials in the model.

[0078] Step S500, if the simulated temperature field does not match the weld metal morphology, modify the heat source function until the simulated temperature field matches the weld metal morphology.

[0079] For example, Figure 5 As shown, step S500 includes:

[0080] Step S510, determining whether the simulated temperature field is consistent with the weld metal morphology.

[0081] It can be understood that in this step, the simulated temperature field is mainly compared with the actual weld metal morphology, and then the simulated temperature field and the weld metal morphology are judged to be consistent according to the critical line of the weld fusion line (weld fusion width), the heat affected zone and the parent material. Figure 6 A set of schematic diagrams of simulated temperature field and actual weld metal morphology are given, among which: Figure 6 The left side of is the simulated temperature field. Figure 6 The right side shows the actual welding situation, among which the main comparison is Figure 6 The part between the two red dotted lines in the left picture and the part between the two red dotted lines on the right side in the actual welding situation.

[0082] If it is determined in step S510 that the simulated temperature field does not match the weld metal morphology, step S520 is executed to modify the welding voltage, welding current, welding speed and / or the radius a of the double ellipsoid in the x, y, and z directions in the heat source function. f , a r , b and / or c.

[0083] Generally, if the peak temperature is lower or higher than the actual peak temperature, it can be adjusted by adjusting the welding voltage, welding current, and welding speed; if the height, width, etc. of the simulated temperature field are different from the actual welding situation, the final simulation field can be adjusted by adjusting the radius of the double ellipsoid in the x, y, and z directions. It can be understood that after adjusting the welding voltage, welding current, welding speed, and / or the radius of the double ellipsoid in the x, y, and z directions in the heat source function, return to step S300, and then re-simulate the welding temperature field through the ABAQUS software.

[0084] If it is determined in step S510 that the simulated temperature field does not match the weld metal morphology ( Figure 6 The figure shows a matching situation), then step S530 is executed to obtain simulation data according to the simulation results. That is, in this step, after obtaining the final simulated temperature field, the required data can be exported from the ABAQUS software as needed, such as the peak temperature, average temperature, temperature change curve over time, heat affected zone size, temperature gradient and other data.

[0085] In some embodiments, although there is little heat transfer and heat loss due to radiation during welding, in order to make the final simulated temperature field more accurate, the heat transfer and heat loss due to radiation during welding can be taken into account. The emissivity of the welding pool to the surrounding environment can be determined according to the welding wood. Usually, the emissivity can be set between 0.65-0.9, but the main object of gas-electric vertical welding is low-carbon steel, so for low-carbon steel, its emissivity can be set to 0.85. The heat loss caused by radiation can be obtained by the following formula:

[0086] Where ε is the emissivity and σ is the Boltzmann constant 5.67×10 -8 [W / m 2 ·K 4 ], T a is the surface temperature of the welded joint, T b is the ambient temperature.

[0087] It can be understood that in this embodiment, if the heat loss due to radiation heat transfer during welding is to be considered, the heat loss caused by radiation is used as an additional load of the three-dimensional model of the heat source shape in the process of constructing and simulating the three-dimensional model of the heat source shape through ABAQUS software.

[0088] In some embodiments, in order to further make the final simulated temperature field more accurate, the heat loss of air convection heat exchange during the welding process can also be taken into account. When determining the heat loss of air convection heat exchange, the film layer heat dissipation coefficient is set to 0.033; similarly, if the heat loss of air convection heat exchange during the welding process is required, then in the process of constructing the three-dimensional model of the heat source shape and simulating it through ABAQUS software, the heat loss of air convection heat exchange must also be taken as an additional load of the three-dimensional model of the heat source shape.

[0089] In some embodiments, when simulating the welding temperature field using the method of the present application, when constructing a three-dimensional model, the three-dimensional model can be meshed. When meshing, the geometric body of the three-dimensional model can be divided into meshes such as triangles, quadrilaterals, tetrahedrons, hexahedrons, etc.; Figure 7 As shown, in this embodiment, in order to balance the calculation accuracy and efficiency, the entire welding component is divided into hexahedral meshes.

[0090] When simulating the temperature field of gas-electric vertical welding, the embodiment of the present application obtains the temperature difference between the coolant at room temperature and after passing through the welding pool, and then calculates a more accurate heat flux density. In this embodiment, the heat flux density is used as an additional load of the three-dimensional model of the heat source shape, which makes the boundary conditions of the three-dimensional model more in line with the actual situation; and in this embodiment, in order to restore the movement path of the gas-electric vertical welding wire, the heat source path function is set to a sine function; in addition, the heat source shape function of this embodiment also takes into account the movement of the heat source, so that the constructed model is more in line with the actual situation, and the simulated temperature field is more consistent with the actual situation; in order to make the constructed three-dimensional model more realistic and reliable, in this embodiment, the heat loss caused by radiation heat transfer and the heat loss caused by air convection heat transfer can also be used as additional loads of the three-dimensional model of the heat source shape.

[0091] Figure 8 A schematic diagram of the structure of a gas-electric vertical welding temperature field simulation device according to an embodiment of the present application is shown. Exemplarily, the gas-electric vertical welding temperature field simulation device comprises:

[0092] The acquisition module 100 is used to acquire the temperature difference of the coolant; wherein the temperature difference is obtained based on the temperature of the coolant at room temperature and the temperature of the coolant after passing through the welding molten pool.

[0093] The calculation module 200 is used to calculate the thermophysical parameters of the base material as it changes with temperature, and calculate the heat flux density of the contact surface between the welding pool and the water-cooled copper slider according to the parameters of the coolant and the temperature difference.

[0094] The construction module 300 is used to construct a three-dimensional model of the heat source shape, use the heat flux density as an additional load of the three-dimensional model of the heat source shape, and apply a body heat source to the three-dimensional model of the heat source shape according to the heat source function.

[0095] The simulation module 400 is used to simulate the three-dimensional model of the heat source shape after the additional load and the application of the body heat source in combination with the thermophysical parameters to obtain a simulated temperature field.

[0096] The judgment module 500 is used to modify the heat source function until the simulated temperature field matches the weld metal morphology if the simulated temperature field does not match the weld metal morphology.

[0097] It can be understood that the device of this embodiment corresponds to the gas-electric vertical welding temperature field simulation method of the above embodiment, and the options in the above embodiment are also applicable to this embodiment, so they will not be repeated here.

[0098] The present application also provides a terminal device. Exemplarily, the terminal device includes a processor and a memory, wherein the memory stores a computer program, and the processor runs the computer program to enable the terminal device to execute the functions of each module in the above-mentioned gas-electric vertical welding temperature field simulation method or the above-mentioned gas-electric vertical welding temperature field simulation device.

[0099] Among them, the processor can be an integrated circuit chip with signal processing capabilities. The processor can be a general-purpose processor, including a central processing unit (CPU), a graphics processing unit (GPU) and a network processor (NP), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or at least one of other programmable logic devices, discrete gates or transistor logic devices, and discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application.

[0100] The memory may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), etc. The memory is used to store a computer program, and the processor may execute the computer program accordingly after receiving an execution instruction.

[0101] The present application also provides a computer-readable storage medium for storing the computer program used in the above-mentioned terminal device. For example, the computer-readable storage medium may include, but is not limited to, various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0102] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or the flow diagram, and the combination of boxes in the structure diagram and / or the flow diagram, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0103] In addition, the functional modules or units in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0104] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application.

[0105] The above description is only a specific implementation manner 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 changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A method for simulating temperature field of gas-electric vertical welding, characterized in that: include: Obtaining a temperature difference of the coolant; wherein the temperature difference is obtained based on the temperature of the coolant at room temperature and the temperature of the coolant after passing through the welding molten pool; Calculating the thermophysical parameters of the base material as it changes with temperature, and calculating the heat flux density of the contact surface between the welding pool and the water-cooled copper slider according to the parameters of the coolant and the temperature difference; Constructing a three-dimensional model of a heat source shape, using the heat flux density as an additional load of the three-dimensional model of the heat source shape, and applying a body heat source to the three-dimensional model of the heat source shape according to a heat source function; Combining the thermophysical parameters, simulating the three-dimensional model of the heat source shape after the additional load and the application of the body heat source to obtain a simulated temperature field; If the simulated temperature field does not match the weld metal morphology, the heat source function is modified until the simulated temperature field matches the weld metal morphology.

2. The method for simulating temperature field of gas-electrode vertical welding according to claim 1, characterized in that: The heat source function includes a heat source shape function and a heat source path function; The heat source shape function is a double ellipsoid heat source function; The heat source path function is a sinusoidal function.

3. The method for simulating temperature field of gas-electrode vertical welding according to claim 2, characterized in that: The heat source shape function is: in, Among them, q f (x, y, z) is the heat source function of the first half of the ellipsoid; q r (x, y, z) is the ellipsoid heat source function in the second half; U is the welding voltage; I is the welding current; v is the welding speed; η is the welding efficiency; t is the time, p1(t) is the position of the heat source at time t, a f , b, c are the radii of the front half of the ellipsoid in the x, y, and z directions respectively, a r , b, c are the radii of the rear half of the ellipsoid in the x, y, and z directions respectively.

4. The method for simulating temperature field of gas-electrode vertical welding according to claim 3, characterized in that: The heat source path function is: Among them, A is the amplitude of the heat source; t is the time; T is the period; k is a constant.

5. The method for simulating temperature field of gas-electrode vertical welding according to claim 3, characterized in that: The modifying of the heat source function comprises: The welding voltage, the welding current, the welding speed and / or the radius of the ellipsoid in the x, y and z directions in the heat source function are modified.

6. The method for simulating temperature field of gas-electrode vertical welding according to claim 1, characterized in that: The step of calculating the heat flux density of the contact surface between the welding molten pool and the water-cooled copper slider according to the parameters of the coolant and the temperature difference comprises: The heat flux density is calculated according to the specific heat capacity of the coolant, the mass of the coolant flowing per unit time, the contact area between the water-cooled copper slider and the welding molten pool, and the temperature difference.

7. The method for simulating temperature field of gas-electrode vertical welding according to claim 1, characterized in that: The calculation of the thermal physical property parameters of the base material as it changes with temperature includes: According to the preset temperature interval, multiple thermophysical parameters of the base material between the current indoor temperature and the boiling point temperature of the welding pool are calculated.

8. A gas-electric vertical welding temperature field simulation device, characterized in that: include: An acquisition module, used to acquire a temperature difference of the coolant; wherein the temperature difference is obtained based on the temperature of the coolant at room temperature and the temperature of the coolant after passing through the welding molten pool; A calculation module, used to calculate the thermophysical parameters of the base material as it changes with temperature, and to calculate the heat flux density of the contact surface between the welding pool and the water-cooled copper slider according to the parameters of the coolant and the temperature difference; A construction module, used for constructing a three-dimensional model of a heat source shape, taking the heat flux density as an additional load of the three-dimensional model of the heat source shape, and applying a body heat source to the three-dimensional model of the heat source shape according to a heat source function; A simulation module, for simulating the three-dimensional model of the heat source shape after the additional load and the application of the body heat source in combination with the thermophysical property parameters, so as to obtain a simulated temperature field; The judgment module is used to modify the heat source function until the simulated temperature field matches the weld metal morphology if the simulated temperature field does not match the weld metal morphology.

9. A terminal device, characterized in that: The terminal device includes a processor and a memory, the memory stores a computer program, and the processor is used to execute the computer program to implement the gas-electric vertical welding temperature field simulation method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: It stores a computer program, which, when executed on a processor, implements the gas-electric vertical welding temperature field simulation method according to any one of claims 1-7.

Images