Welding control method and equipment and storage medium

Abstract

The invention discloses a welding control method and device and a storage medium, and relates to the technical field of welding control, and the method comprises the steps that when it is detected that the pressure value of a welding part reaches a preset first pressure value, an ultrasonic generating device is controlled to output first ultrasonic waves, and primary welding operation is conducted on the welding part; when the initial welding operation reaches a preset first stop condition, current is applied to the welding part until the temperature of the welding part reaches a preset temperature; and the ultrasonic generating device is controlled to output second ultrasonic waves, and rewelding operation is conducted on the welding part. Abrasion of the welding head and the welding seat in the welding process can be reduced.

Description

Technical Field

[0001] The present application relates to the field of welding control technology, and in particular to a welding control method, device and storage medium. Background Art

[0002] Ultrasonic metal welding refers to the process of welding the same or different metals by high-frequency vibration. Ultrasonic welding equipment is mainly composed of ultrasonic generator, transducer, welding head and welding seat. During the welding process, the ultrasonic generator generates high-frequency electrical signals, and the transducer converts electrical energy into mechanical energy to generate high-frequency vibration. The high-frequency mechanical vibration is transmitted to the surface of the metal material to be welded by the welding head. Under the action of pressure and high-frequency vibration, the metal surfaces rub against each other, and atoms pass through the contact surface and penetrate each other, thereby achieving welding.

[0003] When the material to be welded is hard or thick, since the material with greater hardness and thickness requires more energy to overcome its internal resistance to achieve intermolecular bonding, greater ultrasonic energy is required to ensure that the material can be fully melted and form a good weld joint. In addition, in an automated production line or a high-efficiency production environment, in order to improve production efficiency, a faster welding speed is often required. In order to meet this requirement, it is also necessary to increase the energy output of the ultrasonic wave. When the energy is high, the wear of the welding head and welding seat will be aggravated. When the welding head and welding seat are worn to a certain extent, a new welding head and welding seat must be replaced to continue welding, which requires a higher cost.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of this application is to provide a welding control method, equipment and storage medium, aiming to solve the technical problem of how to reduce the wear of the welding head and welding seat during the welding process.

[0006] To achieve the above object, the present application proposes a welding control method, which is applied to a welding device, wherein the welding device includes a welding head, a welding seat and an ultrasonic generating device, and the welding control method includes: When it is detected that the pressure value on the welded part reaches a preset first pressure value, the ultrasonic generating device is controlled to output a first ultrasonic wave to perform an initial welding operation on the welded part; When the initial welding operation reaches a preset first stop condition, applying current to the welded part until the temperature of the welded part reaches a preset temperature; The ultrasonic wave generating device is controlled to output a second ultrasonic wave to perform a re-welding operation on the welded parts.

[0007] In one embodiment, before the step of controlling the ultrasonic generator to output the first ultrasonic wave with the first welding parameter when the pressure value on the welded part reaches the preset first pressure value, the step of performing the initial welding operation on the welded part also includes: If an input signal is received, determining various welding parameters according to the input signal; Generate a control signal according to the welding parameters to control the welding head of the welding equipment to move to a preset descending position according to a preset initial speed; When it is determined that the welding head moves to the descending position, the initial speed is reduced to obtain a second speed; The welding head is controlled to move at the second speed until the pressure value on the welding part reaches the first pressure value.

[0008] In one embodiment, when it is detected that the pressure value on the weldment reaches a preset first pressure value, the step of outputting a first ultrasonic wave through the ultrasonic generating device to perform an initial welding operation on the weldment includes: Obtaining a pressure value on the weldment; When it is detected that the pressure value reaches the first pressure value, determining whether the pressure value changes within a preset time; If there is no change, the ultrasonic generating device is controlled to output the first ultrasonic wave with the first welding parameter to perform the initial welding operation on the weldment.

[0009] In one embodiment, before the step of applying current to the welding part through the heating module until the temperature of the welding part reaches a preset temperature, the step further includes: When a preset first stop time is reached, stopping the initial welding operation; Acquire a first shrinkage degree of the weldment, and determine whether the first shrinkage degree is within a preset first shrinkage degree threshold range; If yes, the welding head is moved toward the welding part until the pressure value on the welding part reaches a preset second pressure value.

[0010] In one embodiment, the heating module is a heating circuit, and the step of applying current to the welding part through the heating module until the temperature of the welding part reaches a preset temperature includes: applying an electric current to the welding part through the heating circuit; Obtaining a voltage value and a current value of the welding piece, and obtaining a resistance value according to the voltage value and the current value; Determining whether a difference between the resistance value and the expected resistance value is within a preset difference range; If not, the connection status among the welding head, welding seat and the welding part is determined, and the positions of the welding part and the welding head are adjusted according to the connection status.

[0011] In one embodiment, the step of controlling the ultrasonic wave generating device to output a second ultrasonic wave to perform a re-welding operation on the welded part comprises: Moving the welding head toward the welding part; When the pressure value on the welding part reaches a preset third pressure value, the movement is stopped; The ultrasonic wave generating device is controlled to output the second ultrasonic wave with a second welding parameter, and a re-welding operation is performed on the weldment.

[0012] In one embodiment, after the step of controlling the ultrasonic wave generating device to output the second ultrasonic wave to perform a re-welding operation on the welded part, the step further includes: When a preset re-welding time is reached, obtaining a second shrinkage degree of the welded part; If the second convergence degree reaches a preset second convergence degree threshold, a re-welding stop signal is generated to stop the re-welding operation.

[0013] In one embodiment, after the step of generating a re-welding stop signal to stop the re-welding operation if the contraction degree reaches a preset second contraction degree threshold, the method further includes: Acquire welding data, and send the welding data to an automation terminal; Based on the judgment result generated by the automation terminal according to the welding data, corresponding prompt information is generated, and the prompt signal includes error information and preparation information.

[0014] Move the welding head to the zero position.

[0015] In addition, to achieve the above objectives, the present application also proposes a welding device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the welding control method described above.

[0016] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the welding control method described above are implemented.

[0017] The present application provides a welding control method, which controls the ultrasonic generating device to output a first ultrasonic wave when it is determined that the pressure value on the weld has reached a preset first pressure value. Performing ultrasonic welding once can make the connection between the welding head, the weld, and the welding seat more complete, increase the area of ​​the connection surface, so that the subsequent application of current for heating can be completed instantly. After the first welding is completed, applying current to the weld for heating can reduce the ultrasonic energy required for welding and reduce the loss of the welding head. Finally, perform ultrasonic welding again to make the weld completely bonded and complete the welding. In summary, this application will use a high-energy ultrasonic welding, which is divided into two low-energy ultrasounds and one current heating, which can effectively protect the welding head and welding seat, thereby extending their life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 A schematic diagram of a flow chart provided for the first embodiment of the welding control method of the present application; Figure 2 A schematic diagram of a flow chart provided for the second embodiment of the welding control method of the present application; Figure 3 Schematic diagram of the welding equipment control system provided for this application; Figure 4 A schematic diagram of a flow chart provided for the third embodiment of the welding control method of the present application; Figure 5 A schematic diagram of a flow chart provided for the fourth embodiment of the welding control method of the present application; Figure 6 It is a structural schematic diagram of the hardware operating environment involved in the welding control method in the embodiment of the present application.

[0021] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0023] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0024] The main solution of the embodiment of the present application is: when it is detected that the pressure value on the weld has reached a preset first pressure value, a first ultrasonic wave is outputted by the ultrasonic generating device to perform an initial welding operation on the weld; an electric current is applied to the weld by the heating module until the temperature of the weld reaches a preset temperature; and a second ultrasonic wave is outputted by the ultrasonic generating device to perform a re-welding operation on the weld.

[0025] Ultrasonic metal welding refers to the process of welding the same or different metals by high-frequency vibration. Ultrasonic welding equipment is mainly composed of ultrasonic generator, transducer, welding head and welding seat. During the welding process, the ultrasonic generator generates high-frequency electrical signals, and the transducer converts electrical energy into mechanical energy to generate high-frequency vibration. The high-frequency mechanical vibration is transmitted to the surface of the metal material to be welded by the welding head. Under the action of pressure and high-frequency vibration, the metal surfaces rub against each other, and atoms pass through the contact surface and penetrate each other, thereby achieving welding.

[0026] When the material to be welded is hard or thick, since the material with greater hardness and thickness requires more energy to overcome its internal resistance to achieve intermolecular bonding, greater ultrasonic energy is required to ensure that the material can be fully melted and form a good weld joint. In addition, in an automated production line or a high-efficiency production environment, in order to improve production efficiency, a faster welding speed is often required. In order to meet this requirement, it is also necessary to increase the energy output of the ultrasonic wave. When the energy is high, the wear of the welding head and welding seat will be aggravated. When the welding head and welding seat are worn to a certain extent, a new welding head and welding seat must be replaced to continue welding, which requires a higher cost.

[0027] In order to solve the above problems, the present application provides a welding control method, which controls the ultrasonic generating device to output a first ultrasonic wave when it is determined that the pressure value on the weld has reached a preset first pressure value. Performing ultrasonic welding once can make the connection between the welding head, the weld and the welding seat more complete, increase the area of ​​the connection surface, so that the subsequent application of current for heating can complete the heating instantly. After the first welding is completed, applying current to the weld for heating can reduce the ultrasonic energy required for welding and reduce the loss of the welding head. Finally, perform ultrasonic welding again to make the weld completely bonded and complete the welding. In summary, in this application, a high-energy ultrasonic welding will be used, which is divided into two low-energy ultrasounds and one current heating, which can effectively protect the welding head and welding seat, thereby extending their lifespan.

[0028] It should be noted that the execution subject of this embodiment can be a computing service device with network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device or device capable of realizing the above functions. The following takes welding equipment as an example to illustrate this embodiment and the following embodiments.

[0029] Based on this, the embodiment of the present application provides a welding control method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the welding control method of the present application.

[0030] In this embodiment, the welding control method is applied to a welding device, wherein the welding device includes a welding head, a welding seat and an ultrasonic generating device. The method includes steps S100 to S300: Step S100, when it is detected that the pressure value on the weldment reaches a preset first pressure value, the first ultrasonic wave is outputted by the ultrasonic generating device to perform an initial welding operation on the weldment.

[0031] It should be noted that the ultrasonic welding equipment includes a welding machine frame and a generator control box. The control box includes: a power supply, an ultrasonic generator and a control system; the welding machine frame includes: a welding head, a welding seat, a transducer, a horn and a lifting device. The welding head can be moved by the lifting device so that the welding head, the welding seat and the welded part are closely connected, thereby performing welding operations.

[0032] In this embodiment, a pressure sensor can be installed on the welding head or the mobile device. In the process of the mobile device driving the welding head close to the weldment, the reading of the pressure sensor is obtained. When the pressure reaches the minimum value that can ensure the clamping of the weldment, the movement is stopped. The minimum value can be determined by performing a welding test on the weldment in advance. When the pressure value on the weldment is the first pressure value, it is considered that the effect of the probe clamping the weldment can be achieved. At this time, the ultrasonic generator is controlled to emit a first ultrasonic wave to perform an initial welding operation. It can be understood that both the welding head and the welding seat are toothed surfaces. Before the initial welding operation is performed, the area of ​​the connection surface between the welding head, the welding seat and the weldment is too small. By performing an ultrasonic welding first, the connection between the welding head, the weldment and the welding seat can be made more complete, and the area of ​​the connection surface can be increased.

[0033] In a feasible implementation, the first pressure value can be determined according to the material properties, geometric dimensions and processing conditions of the weldment. Before welding, the geometric dimensions of the weldment are determined, and the first pressure value is determined according to the geometric dimensions and specific requirements of the welding process, such as welding temperature, welding speed, thermal expansion coefficient of welding material, etc.

[0034] In a feasible implementation, a visual inspection system can also be used to observe the contact between the welding head and the weldment. By tracking the marks or characteristic points on the weldment surface and the welding head, when the welding head and the weldment reach an ideal pressing state, such as no visible gap between the welding head and the weldment or slight deformation on the weldment surface, the pressure value at this time is used as the first pressure value.

[0035] In a feasible implementation, step S100 may include the following steps: A pressure value on the weldment is obtained.

[0036] When it is detected that the pressure value reaches the first pressure value, it is determined whether the pressure value changes within a preset time.

[0037] If there is no change, the first ultrasonic wave is outputted by the ultrasonic generating device with the first welding parameter to perform the initial welding operation on the weldment.

[0038] In this embodiment, when the pressure value on the welding head does not change within a preset time, it is considered that the welding head is in good contact with the weld. At this time, the ultrasonic generator is controlled to output the first ultrasonic wave according to the set first welding parameter. The welding parameters include ultrasonic frequency, ultrasonic power, welding pressure, welding time, etc. After the ultrasonic energy is transmitted to the weld, the molecules of the weld material begin to initially rub and diffuse with each other under high-frequency vibration, so that the weld is shrunk and bonded.

[0039] Step S200: applying current to the weld part through the heating module until the temperature of the weld part reaches a preset temperature.

[0040] In this embodiment, after performing ultrasonic welding once (i.e., initial welding), the temperature of the weld is increased by generating heat inside the weld. With the welding head as the positive electrode and the welding seat as the negative electrode, when the welding head is in close contact with the weld, current is output through the heating module, and the current flows from the welding head to the welding seat to form a loop. When the current passes through the metal weld, the interaction between the electrons and the metal atoms generates resistance, thereby generating heat, achieving the effect of increasing the temperature of the weld. When it is detected that the temperature of the weld reaches a preset temperature threshold, the output of current is stopped. By applying current to the weld to increase the temperature of the weld, the intensity of molecular motion in the weld is increased, thereby reducing the ultrasonic energy required for welding.

[0041] It is understandable that according to the resistance formula R=ρ*L / S, S is the cross-sectional area of ​​the conductor. When the area is smaller, the resistance is greater, and accordingly, the heat generated is greater. The cross-sectional area of ​​the welding head and welding seat is much larger than the area of ​​the welded part. Therefore, when the welded part heats up, the temperature of the welding head will not rise too high, reducing energy loss, and the welding head and welding seat can also be cooled in time, which will not affect the power output effect.

[0042] In a feasible implementation, a highly sensitive thermocouple can be installed in a hole above the welding seat, and a PID temperature controller (proportional integral differential temperature controller) can be used to set the temperature range, monitor the temperature of the weld in real time, and control the output of the current through the on-off signal output by the temperature controller to stop the current output when the real-time temperature is in the set temperature zone. Infrared sensors can also be used to directly monitor the temperature of the weld.

[0043] In a feasible implementation manner, step S200 may include the following steps: Obtaining a voltage value and a current value of the welding piece, and obtaining a resistance value according to the voltage value and the current value; Determining whether a difference between the resistance value and the expected resistance value is within a preset difference range; If not, the connection status among the welding head, welding seat and the welding part is determined, and the positions of the welding part and the welding head are adjusted according to the connection status.

[0044] In this embodiment, it is verified whether the welding head, welding piece and welding seat form a loop. Before starting the current output, use the resistance range of the multimeter to measure the resistance of the entire welding circuit. If the resistance value is infinite, there is a high probability that there is a circuit break, and the connection needs to be checked first. After starting the current output, use a voltmeter to measure the voltage of the welding piece, use an ammeter to read the current information, and calculate the corresponding resistance by combining Ohm's law. Compare the calculated resistance with the expected resistance, which is determined according to the component specifications and welding process. If the difference between the two is within the preset difference range and the temperature of the welding piece gradually rises, it can be determined that the current forms a loop. If it is found in this process that the ammeter reading is abnormal (such as 0), the calculated resistance is inconsistent with the expectation (such as the calculated resistance is too large), or the temperature rise is not observed, the circuit connection, components and equipment are further checked. Check whether the physical connection between the welding head, welding piece and welding seat is good, whether the welding head is in close contact with the welding piece, and whether there is looseness, displacement or foreign matter blocking the welding piece and the welding seat. If any gap or foreign matter is found, it is necessary to clean the foreign matter and readjust the position of the welding head and the weldment to ensure close contact.

[0045] Step S300, outputting a second ultrasonic wave through the ultrasonic wave generating device to perform a re-welding operation on the weldment.

[0046] In this embodiment, when it is confirmed that the temperature of the welded part reaches the preset temperature range, a re-welding operation signal is issued to control the ultrasonic generator to output a second ultrasonic wave, and a second welding operation is performed to completely bond the welded part. The ultrasonic welding with only one high energy is split into two low energy ultrasonic waves and one current heating, which reduces the ultrasonic energy required for welding, thereby effectively protecting the welding head and welding seat and extending their service life.

[0047] In this embodiment, the welding parameters of the initial welding and the re-welding may be the same or different. When the characteristics of the welding material are relatively stable, the welding parameters may be the same. After the welded parts are initially welded and bonded, the material state of the welded parts may change. In order to compensate for these changes and ensure the welding quality, the parameters can be adjusted in the re-welding stage to adapt to the new material state. At this time, the welding parameters of the two times are different.

[0048] In a feasible implementation manner, the following steps may be further included before step S300: The welding head is moved toward the welding part, and the pressure value on the welding part is obtained.

[0049] When the pressure value reaches a preset third pressure value, the movement stops.

[0050] A re-welding signal is generated to trigger the re-welding operation.

[0051] In this embodiment, after the welding part is heated by the current, the welding head is moved downward. During the movement, the pressure value on the welding part is detected in real time by the pressure sensor. When the pressure value reaches the third pressure value, the sensor generates a signal to feed back to the control system, and the control system stops moving the welding head according to the feedback information. The ultrasonic generator is controlled to output the second ultrasonic wave with the second welding parameter, and the welding part is re-welded to make the welding part completely bonded and the welding is completed.

[0052] In this embodiment, by further moving the welding head downward, it is possible to avoid slight contraction, expansion or displacement of the weldment during the welding process, which would reduce the contact pressure between the welding head and the weldment, thereby affecting the transmission effect of ultrasonic energy. By moving the welding head downward, it is possible to ensure that good contact pressure is always maintained between the welding head and the weldment, thereby ensuring welding quality.

[0053] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 2 , before step S100, steps S01 to S04 may also be included: Step S01, if an execution signal input by a user is received, then various welding parameters are determined according to the execution signal; Step S02, generating a control signal according to the welding parameters to control the welding head to move to a preset descending position according to a preset initial speed; Step S03, when it is determined that the welding head moves to the descending position, reducing the initial speed to obtain a second speed; Step S04, controlling the welding head to move at the second speed, and stopping the movement of the welding head when it is detected that the pressure value on the welding part reaches the first pressure value.

[0054] Please refer to Figure 3 In this embodiment, the control system of the welding equipment includes a human-machine interface and a single-chip computer system. The human-machine interface is also called a user interface or a user interface. It is a medium and a window for communication between people and computers to transmit and exchange information. It is used for real-time display of data, setting of functions and parameters, setting of quality monitoring, statistics of data, recording of each welding data, and interaction with other platforms. The human-machine interface interacts with the single-chip computer system through a serial port, and interacts with other terminals through a serial port or a network protocol. The human-machine interface reads and displays the data of the single-chip computer in real time. The single-chip computer system is an operating system for realizing specific functions, which is used to interact with the ultrasonic generator and the heating module, control the docking with the rack, and coordinate the work of each module. Optionally, the STM32F407ZGT6 of STMicroelectronics is selected as the core chip of the control board. The chip is a 32-bit high-performance ARM Cortex-M4 processor with an operating frequency of 168MHZ, and has functions such as ADC (analog-to-digital converter), DAC (digital-to-analog converter), and USART (universal asynchronous receiver and transmitter).

[0055] In this embodiment, before welding, initialization operations can be performed. Including: data initialization, setting the parameter lights; display light initialization, lighting the operation indicator light, turning off the status indicator light, turning on the buzzer; USART (Universal Synchronous / Asynchronous Receiver / Transmitter) initialization, configuring USART; mdb (Multi-drop Bus) data initialization, assigning initial values ​​to the mdb array and status bits; input initialization, configuring the pins of the input IO port; output initialization, configuring the pins of the output IO port; eeprom (Electrically Erasable Programmable Read-Only Memory) initialization, when the conditions are met, clearing the data storage area; SPI (Serial Peripheral Interface) initialization, analog-to-digital converter (ADC) initialization, digital-to-analog converter (DAC) initialization, timer initialization, configuring the required timer.

[0056] In this embodiment, the welding head is installed at the output end of the ultrasonic generator. Before starting the welding operation, the servo motor is reset to zero on the human-machine interface so that the ultrasonic generator and the welding head controlled by it return to the initial position. The welding parameters are input, and the motor movement is checked to see if it is smooth without jamming or abnormal noise. The servo motor is used to quickly move the welding head to a preset descending position near the top of the weldment at an initial speed. During the movement, a height sensor is used to record the height value of the welding head in real time. When the height value obtained minus the thickness of the weldment reaches the preset height value, it is confirmed that the welding head has reached the descending position, at which time the pressure on the weldment is zero. After reaching the preset position, the initial speed is reduced and the welding head continues to move slowly at a second speed. At the same time, the pressure device starts working and monitors the pressure between the welding head and the weldment in real time. When the pressure reaches the preset first pressure value, the welding head is stopped from moving, and the welding head is in close contact with the weldment.

[0057] In this embodiment, the welding head is driven by a servo motor to move to a preset position. Compared with the lifting device of the cylinder, when the toughness of the welding material is poor, the number of foil layers is small, or there is no protective sheet, the servo device can reduce the impact force caused by the vertical descent, making the foil less likely to be damaged, and at the same time protecting the welding teeth of the welding head.

[0058] Based on the first embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 4 , before step S200, steps A100 to A300 may also be included: Step A100, when the preset first stop time is reached, the initial welding operation is stopped.

[0059] In this embodiment, whether to stop the initial welding operation is controlled according to time. A re-welding time threshold is predetermined according to factors such as the material and thickness of the welded parts, the frequency and power of the ultrasonic wave, etc. When the re-welding time threshold is reached, the initial welding operation is stopped. For example, when welding thinner aluminum foil and nickel connecting sheet, it is determined through multiple experiments that a welding time of about 0.5 seconds can achieve a good shrinking and bonding effect of the welded parts.

[0060] In another feasible implementation, the initial welding operation can also be stopped when the ultrasonic energy transmitted to the welded part reaches a preset energy value. During the welding process, the energy output by the ultrasonic generator is monitored in real time or regularly. The energy is determined by the formula E=P×t (where E is energy, P is power, and t is time). During the welding process, when the ultrasonic energy transmitted to the welded part reaches a preset energy value, the initial welding process is stopped.

[0061] Step A200, obtaining a first shrinkage degree of the weldment, and determining whether the first shrinkage degree is within a preset first shrinkage degree threshold range.

[0062] In this embodiment, after the initial welding operation is completed, the effect of the initial welding is verified by the degree of contraction of the welded parts.

[0063] Optionally, the thickness of the weldment can be used to determine whether the convergence meets the standard. During the initial welding process, the thickness of the weldment is obtained by testing the height sensor. The laser height sensor can be used to emit a laser beam to the surface of the weldment, and the distance between the sensor and the surface of the weldment can be obtained by measuring the time it takes for the laser to reflect back to the sensor or the phase change of the reflected light. The initial distance measured before welding is compared with the difference between the detected distances. When the difference between the two is within the preset standard range, it is considered that the convergence also meets the preset convergence standard.

[0064] Optionally, the degree of convergence can also be determined by ultrasonic flaw detection. Ultrasonic waves are emitted to the welding area. When the ultrasonic waves propagate inside the weldment, they will be reflected and refracted at the interface of different media (such as the welded part and the unwelded part). By continuously monitoring the characteristics of the reflected and refracted waves, such as changes in amplitude, frequency, phase, etc., the fusion of the welding interface can be understood in real time. For example, when there are unfused gaps or loose areas on the welding interface, the reflected waves of the ultrasonic waves will be enhanced and the refracted waves will be weakened. Based on these signal changes, it can be determined whether the degree of convergence is within the qualified range.

[0065] Alternatively, the degree of contraction can be determined by electrical methods. A small current is applied across the welded parts while measuring the resistance of the welded area. During the welding process, as the welding progresses, the contact between the welded parts becomes closer and the resistance gradually decreases. If the resistance value stabilizes within a reasonable lower range, it means that the connection between the welded parts is tight and the degree of contraction is acceptable.

[0066] Step A300: If yes, move the welding head toward the welding part until the pressure value on the welding part reaches a preset second pressure value.

[0067] In this embodiment, after confirming that the initial welding has achieved the target effect and the degree of contraction of the welded parts meets the expected effect, the welding head is moved downward again. When the pressure between the welding head and the welded parts reaches a preset second pressure value, the welding head is stopped from moving to ensure that the welding head, the welded parts, and the welding seat are closely connected to prevent the connection from being interrupted, resulting in the inability of the current to form a circuit and causing heating failure. After stopping moving the probe, the heating module outputs current to heat the welded parts. After the temperature of the welded parts reaches a preset temperature, the current is disconnected and the heating is stopped.

[0068] Based on the first embodiment of the present application, in the fourth embodiment of the present application, the same or similar contents as those in the first embodiment can be referred to the above description, and will not be described in detail later. Figure 5 , step S300 may further include steps S310 to S340: Step S310: outputting the second ultrasonic wave with a second welding parameter through the ultrasonic wave generating device to perform the re-welding operation on the weldment.

[0069] Step S320, when the preset second stop time is reached, stop the re-welding operation.

[0070] Step S330, obtaining a second shrinkage degree of the weldment, and determining whether the second shrinkage degree is within a preset second shrinkage degree threshold range.

[0071] Step S340: If yes, a re-welding stop signal is generated to stop the re-welding operation.

[0072] In this embodiment, whether to stop the re-welding operation is controlled according to time. The re-welding operation can also be stopped when the ultrasonic energy transmitted to the welded parts reaches a preset energy value. The judgment method for stopping the re-welding operation is the same as the judgment method for stopping the initial welding operation in the above embodiment, and will not be repeated here.

[0073] In this embodiment, after the re-welding process is stopped, a tensile test can also be performed to detect the degree of contraction of the welded part. Before starting the test, the tensile tester is calibrated and the tensile speed is determined according to the material and size of the welded part. The welded part is mounted on the fixture of the tensile tester to ensure that the fixture can firmly clamp the two ends of the welded part. After starting the test, the tensile tester is started and the tensile force is applied. During the stretching process, the sensor of the tester records the magnitude of the tensile force and the elongation of the welded part. As the tensile force increases, observe whether the welding part of the welded part shows signs of separation or loosening. When the welded part is completely separated at the welding part, the tensile force value at this time is recorded. The degree of contraction is determined by comparing the actual measured tensile force value with the qualified tensile force value specified in the material and welding process standards. For example, if the standard stipulates that the qualified tensile force of a certain plastic welded part is 80N, and the actual measured loosening phenomenon occurs when the tensile force is 70N, it is considered that the degree of contraction of the welded part does not meet the requirements.

[0074] Based on the first embodiment of the present application, in the fifth embodiment of the present application, the same or similar contents as those in the first embodiment can be referred to the above description, and will not be described in detail later. On this basis, after step S300, the following steps may be further included: Acquire welding data, and when the number of the welding data is within a preset quantity range, save each welding data to a sampling area; Determining whether the welding data meets the preset welding standard; If yes, generating the latest welding standard according to the welding data, and updating the welding standard according to the latest welding standard; If not met, an alarm signal is generated.

[0075] In this embodiment, the welding data may come from information recorded by sensors on the welding equipment, such as pressure value, temperature value, welding time, ultrasonic energy output, etc. during welding, or may come from inspection data of the workpiece after welding, such as strength test results of the welding part, appearance quality, etc. After obtaining the welding data, it is determined whether the welding is successful based on the welding data.

[0076] In this embodiment, the welding data can be monitored in real time during the welding process. During the welding process, when the number of welded parts welded at one time meets the preset number range, the corresponding welding data is saved to the sampling area. When the number of saved welding data reaches the maximum number, this group of welding data is analyzed to determine whether it meets the welding standard range. The welding standard can be derived from the calculation of the previous group of welding data. For example, in the previous group of welding data, the average temperature of the welding part is within a certain interval, and the standard deviation of the welding head pressure is in a specific numerical range. Based on these data, the standard range is constructed. If the current group of welding data meets the welding standard range, the new judgment standard is recalculated and updated according to the latest collected group of welding data as the basis for the next round of welding data analysis. And generate and output a preparation signal, which is used to prompt that the next welding operation can continue to advance. After outputting the preparation signal, the welding head is driven to move to its initial position to ensure that the entire welding process can be carried out in an orderly and efficient cycle. If the current group of welding data does not meet the welding standard range, it indicates that an abnormal situation has occurred in the welding process, and there may be problems such as improper welding parameter settings, defects in welding materials, or failures in welding equipment. At this time, an alarm signal is generated and output. The alarm signal can be a flashing red light or a beeping sound on the equipment control panel, or detailed fault prompt information.

[0077] In this embodiment, by dynamically determining the welding standard, it is possible to adapt to possible changes in welding conditions, fluctuations in material properties and other factors, and continuously optimize welding quality control.

[0078] The present application provides a welding device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the welding control method in the above-mentioned embodiment 1.

[0079] Reference below Figure 6 , which shows a schematic structural diagram of a welding device suitable for implementing an embodiment of the present application. Figure 6 The welding equipment shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application. Figure 6As shown, the welding device may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM) 1004. Various programs and data required for the operation of the welding device are also stored in the random access memory 1004. The processing device 1001, the read-only memory 1002, and the random access memory 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the welding device to communicate with other devices wirelessly or by wire to exchange data. Although the welding device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0080] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0081] The welding equipment provided by the present application, using the welding control method in the above embodiment, can solve the technical problem of how to reduce the wear of the welding head and the welding seat during the welding process. Compared with the prior art, the beneficial effects of the welding equipment provided by the present application are the same as the beneficial effects of the welding control method provided by the above embodiment, and the other technical features in the welding equipment are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0082] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0083] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present 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. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0084] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the welding control method in the above-mentioned embodiment.

[0085] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM, CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, radio frequencies (RF, Radio Frequency), etc., or any suitable combination of the above.

[0086] The computer-readable storage medium may be included in the welding device; or it may exist independently without being assembled into the welding device. The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the welding device, the welding device: when it is detected that the pressure value on the weld reaches a preset first pressure value, the first ultrasonic wave is output through the ultrasonic generator to perform an initial welding operation on the weld; current is applied to the weld through the heating module until the temperature of the weld reaches a preset temperature; and the second ultrasonic wave is output through the ultrasonic generator to perform a re-welding operation on the weld.

[0087] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0088] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession 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 square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0089] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0090] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned welding control method, and can solve the technical problem of how to reduce the wear of the welding head and the welding seat during the welding process. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the welding control method provided in the above-mentioned embodiment, and will not be repeated here.

[0091] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A welding control method, characterized in that: Applied to welding equipment, the welding equipment includes a welding head, an ultrasonic generating device and a heating module, and the method includes: When it is detected that the pressure value on the welded part reaches a preset first pressure value, the first ultrasonic wave is outputted by the ultrasonic generating device to perform an initial welding operation on the welded part; Applying current to the welding part through the heating module until the temperature of the welding part reaches a preset temperature; The second ultrasonic wave is outputted by the ultrasonic wave generating device to perform a re-welding operation on the welded parts.

2. The welding control method according to claim 1, characterized in that: Before the step of outputting a first ultrasonic wave through the ultrasonic generating device when the pressure value on the welded part reaches a preset first pressure value and performing an initial welding operation on the welded part, the step further includes: If an execution signal input by a user is received, various welding parameters are determined according to the execution signal; Generate a control signal according to the welding parameters to control the welding head to move to a preset descending position according to a preset initial speed; When it is determined that the welding head moves to the descending position, the initial speed is reduced to obtain a second speed; The welding head is controlled to move at the second speed until the pressure value on the welding part reaches the first pressure value.

3. The welding control method according to claim 1, characterized in that: The step of outputting a first ultrasonic wave through the ultrasonic generating device to perform an initial welding operation on the welded part when the pressure value on the welded part reaches a preset first pressure value comprises: Obtaining a pressure value on the weldment; When it is detected that the pressure value reaches the first pressure value, determining whether the pressure value changes within a preset time; If there is no change, the first ultrasonic wave is outputted by the ultrasonic generating device with the first welding parameter to perform the initial welding operation on the weldment.

4. The welding control method according to claim 1, characterized in that: Before the step of applying current to the welding part through the heating module until the temperature of the welding part reaches a preset temperature, the method further includes: When a preset first stop time is reached, stopping the initial welding operation; Acquire a first shrinkage degree of the weldment, and determine whether the first shrinkage degree is within a preset first shrinkage degree threshold range; If yes, the welding head is moved toward the welding part until the pressure value on the welding part reaches a preset second pressure value.

5. The welding control method according to claim 1, characterized in that: The heating module is a heating circuit, and the step of applying current to the welding part through the heating module until the temperature of the welding part reaches a preset temperature includes: applying an electric current to the welding part through the heating circuit; Obtaining a voltage value and a current value of the welding piece, and obtaining a resistance value according to the voltage value and the current value; Determining whether a difference between the resistance value and the expected resistance value is within a preset difference range; If not, the connection status among the welding head, welding seat and the welding part is determined, and the positions of the welding part and the welding head are adjusted according to the connection status.

6. The welding control method according to claim 1, characterized in that: Before the step of outputting a second ultrasonic wave through the ultrasonic wave generating device to re-weld the welded part, the step further includes: Moving the welding head toward the welding part and obtaining the pressure value on the welding part; When the pressure value reaches a preset third pressure value, stop moving; A re-welding signal is generated to trigger the re-welding operation.

7. The welding control method according to claim 1, characterized in that: The step of outputting a second ultrasonic wave by the ultrasonic wave generating device to re-weld the welded part comprises: Outputting the second ultrasonic wave with a second welding parameter by the ultrasonic wave generating device to perform the re-welding operation on the weldment; When a preset second stop time is reached, stopping the re-welding operation; Acquire a second shrinkage degree of the weldment, and determine whether the second shrinkage degree is within a preset second shrinkage degree threshold range; If so, a re-welding stop signal is generated to stop the re-welding operation.

8. The welding control method according to claim 1, characterized in that: After the step of outputting a second ultrasonic wave through the ultrasonic wave generating device to re-weld the welded part, the step further includes: Acquire welding data, and when the number of the welding data is within a preset quantity range, save each welding data to a sampling area; Determining whether the welding data meets the preset welding standard; If yes, generating the latest welding standard according to the welding data, and updating the welding standard according to the latest welding standard; If not met, an alarm signal is generated.

9. A welding device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the welding control method according to any one of claims 1 to 8.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the welding control method according to any one of claims 1 to 8 are implemented.

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