Ultrasonic welding vibration measurement structure and detection method thereof

Abstract

The ultrasonic welding vibration measurement structure comprises a driving assembly, a welding assembly, a bottom die, a vibration measurement assembly and a monitoring assembly, and the driving assembly is used for controlling and driving the welding assembly to move up and down; the bottom die lifting assembly drives the bottom die to move up and down, a mounting seat is arranged below the bottom die, the vibration measuring assembly comprises a laser displacement sensor, a reflector and a fixing support, the reflector and the fixing support are fixedly mounted, the fixing support is fixed to the mounting seat, and the reflector and the fixing support are located between the laser displacement sensor and the bottom die. The reflecting plate and the bottom die simultaneously ascend or descend; the monitoring system is used for collecting and analyzing bottom die vibration data in real time, extracting feature points through algorithm analysis and controlling, and outputting an alarm signal when fluctuation exceeds a limit value. The reflecting plate provides an effective reflecting target for the laser displacement sensor in the welding operation and the subsequent stage, the sensor signal loss is effectively prevented, the sensor error report is completely eradicated, and the algorithm stability is improved.

Description

Technical Field

[0001] The invention relates to the field of ultrasonic welding detection, and in particular to an ultrasonic welding vibration measuring structure and a detection method thereof. Background Art

[0002] Ultrasonic welding is a method of connecting two or more materials by applying ultrasonic waves. It uses high-frequency vibration (usually in the frequency range of 15kHz to 70kHz) to convert electrical energy into high-frequency mechanical vibration energy through a transducer, and then amplifies the vibration amplitude with the help of a horn and transmits it to the welding tool (welding head). The welding head acts on the surface of the workpiece to be welded, so that the contact surfaces between the workpieces rub against each other and generate heat under high-frequency vibration and a certain pressure, causing the materials at the contact surface to reach a molten state, and then fuse together under pressure. After cooling and solidification, a strong weld joint is formed, completing the welding process.

[0003] In the existing ultrasonic welding process, the stability of welding quality has always been a key issue of concern in the industry. Traditional welding methods often make it difficult to monitor and evaluate the energy transfer and consumption in real time and accurately during the welding process, resulting in a high probability of defective welding products, which not only wastes a lot of raw materials and production costs, but also affects production efficiency and the overall quality of the product. In addition, during the welding process, due to the lack of effective monitoring methods, once abnormal fluctuations in welding parameters occur, it is difficult to detect and adjust them in time, further increasing the uncertainty of product quality. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide an ultrasonic welding vibration measuring structure and a detection method thereof. The structure uses a high-precision vibration sensor to monitor the actual amplitude and energy change of the welding workpiece after the output of the welder and transmitted to the bottom mold, so as to determine whether there are abnormalities and poor welding in the welding equipment and the welding process of the welding workpiece. At the same time, a specific mechanical structure is used to assist the vibration measuring sensor in collecting vibration waveforms to prevent the sensor from collecting abnormalities due to the disappearance of the target object, thereby ensuring the quality of the welding workpiece and reducing material scrap.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] The present invention provides an ultrasonic welding vibration measuring structure, comprising a driving component, a welding component, a bottom mold, a vibration measuring component and a monitoring component.

[0007] A driving assembly, which is used to control the up and down movement of the welding assembly;

[0008] A bottom mold lifting assembly drives the bottom mold to move up and down, and a mounting seat is provided below the bottom mold.

[0009] The vibration measuring assembly comprises a laser displacement sensor, a reflector and a fixing bracket, wherein the reflector is fixedly mounted on the fixing bracket, the fixing bracket is fixed on the mounting seat, the reflector and the fixing bracket are located between the laser displacement sensor and the bottom mold, and the reflector and the bottom mold rise or fall simultaneously;

[0010] The monitoring system is used to collect and analyze the bottom mold vibration data in real time, extract characteristic points through algorithm analysis and perform management and control, and output an alarm signal when the fluctuation exceeds the limit value.

[0011] As a preferred solution, a laser channel is provided on the reflective plate. When the reflective plate moves upward, the laser passes through the laser channel and is projected onto the bottom mold. When the reflective plate moves downward, the laser is projected onto the reflective plate.

[0012] As a preferred solution, the driving component may be a first pneumatic component or a first electric component, the first pneumatic component includes a first proportional valve and a first cylinder, and the first electric component is a first motor.

[0013] As a preferred solution, the monitoring system includes an acquisition card, a data processing unit and an alarm device. The acquisition card is used to collect the bottom mold vibration waveform transmitted by the laser displacement sensor and transmit it to the data processing unit. The data processing unit extracts feature points through algorithm analysis and performs control. When the fluctuation exceeds the upper and lower limit values, the abnormal welding is output to the alarm device.

[0014] As a preferred solution, the bottom mold lifting component can be a second pneumatic component or a second electric component, the second pneumatic component includes a second proportional valve and a second cylinder, and the second electric component is a second motor.

[0015] As a preferred solution, the laser displacement sensor is installed on an ultrasonic welding frame, and the laser displacement sensor is communicatively connected with the monitoring system to collect vibration data of the bottom mold and transmit it to the monitoring system.

[0016] The present invention also provides an ultrasonic welding vibration detection method, which uses the welding vibration detection structure described in any of the above schemes, and includes the following steps:

[0017] Start welding, the driving assembly pushes the welding head assembly to press down, the bottom mold lifting assembly pushes the bottom mold and the reflector to the set position, and the driving assembly pushes the welding head assembly until the welding head tooth surface contacts the welding workpiece and the bottom mold tooth surface contacts the welding workpiece;

[0018] During the welding process, the vibration of the bottom mold is detected in real time, and the reflector also rises with the bottom mold. The laser beam emitted by the laser displacement sensor passes through the laser channel on the reflector and shoots to the surface of the bottom mold. The laser displacement sensor collects the bottom mold vibration waveform data during the welding process through the acquisition card and transmits it to the monitoring system;

[0019] Welding is completed. After ultrasonic welding is completed, the driving component drives the welding head to lift up, the bottom mold lifting component drives the bottom mold and the reflector to descend, and the laser displacement sensor beam is projected onto the reflector.

[0020] As a preferred solution, during welding, the energy output from the ultrasonic generator system to the welding head is EO; the energy consumed by the welding workpiece is EW; the energy transmitted to the bottom mold is Es; according to the law of conservation of energy, the relationship is Eo=Ew+Es.

[0021] As a preferred solution, the Eo is a constant set welding energy value. During welding, the energy transmitted from top to bottom to the bottom mold is Es. Es can be obtained through an algorithm after collecting waveform data through a laser sensor, so that the energy consumed by the welding workpiece can be calculated as EW; when the energy consumed by the welding workpiece EW fluctuates within the set range, it indicates that the welding quality is stable. When the fluctuation of EW exceeds the set range, it indicates that the welding quality is unstable. By monitoring the energy Es on the bottom mold, it can be reversely concluded that the energy consumed by the welding workpiece is Ew. The Es characteristic quantity is obtained through the algorithm for upper and lower line monitoring. When it exceeds the range, the monitor will send out an alarm signal.

[0022] The beneficial effects of the present invention are as follows: the present invention provides an effective reflection target for the laser displacement sensor during the welding operation and subsequent stages by setting a reflective plate that automatically rises and falls, effectively preventing the sensor signal from being lost, eliminating sensor errors, increasing algorithm stability, ensuring the accuracy and consistency of vibration data collection, and facilitating subsequent accurate judgment of welding quality;

[0023] During the welding process, even if the welding machine moves up and down at a high frequency, the structure and method of the present invention can ensure that the sensor can always accurately measure the vibration of the bottom mold and collect and upload relevant data, and data collection errors will not occur due to frequent movements during the welding process, thereby providing reliable support for continuous and stable monitoring of welding quality.

[0024] The present invention is an online monitoring system with the functions of online collection, detection, algorithm analysis and output alarm. It can monitor the vibration conditions and energy changes in the welding process in real time. Once an abnormality is found, an alarm can be issued in time to prevent abnormal welding and the outflow of workpieces, effectively control the quality of welding products, and reduce material waste and increased production costs caused by poor welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the motion structure of the reflector and the bottom mold;

[0028] Figure 3 This is a waveform collection diagram of a welding process;

[0029] Figure 4 This is a waveform capture during welding;

[0030] Figure 5 is the calculation graph of the first eigenvalue;

[0031] Figure 6 is the calculation graph of the second eigenvalue;

[0032] Figure numerals: 1. ultrasonic welding machine; 2. transducer; 3. laser displacement sensor; 4. laser channel; 5. bottom mold lifting assembly; 6. bottom mold; 7. reflector; 8. welding head, 9. mounting base. DETAILED DESCRIPTION

[0033] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described 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. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different 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.

[0034] In the description of the embodiments of the present application, the terms "upper", "lower", "front", "rear", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", etc. are only used to distinguish in the description and have no special meaning.

[0035] Existing ultrasonic welding quality inspection usually uses laser displacement sensors to directly measure the vibration of the bottom mold. Laser displacement sensors and their supporting equipment are relatively expensive. In the process of use, the bottom mold moves up and down, which may cause the measured target to disappear. In order to re-acquire the effective reflection signal of the target, the laser may automatically adjust parameters such as power. If this adjustment is performed frequently, it is difficult for the laser displacement sensor to maintain a stable power output state. In the long run, it will not only affect the accuracy and stability of the measurement, but also easily cause the acquisition algorithm inside the laser displacement sensor to malfunction.

[0036] In order to solve the above technical problems, according to some embodiments of the present application, please refer to Figures 1 to 6 As shown, an ultrasonic welding vibration measuring structure is provided, including a driving component, a welding component, a bottom mold, a vibration measuring component and a monitoring component.

[0037] A driving assembly, which is used to control the up and down movement of the welding assembly;

[0038] The bottom mold lifting component 5 drives the bottom mold 6 to move up and down. A mounting seat 9 is provided below the bottom mold 6.

[0039] The vibration measuring assembly includes a laser displacement sensor 3, a reflector 7 and a fixing bracket 10. The reflector and the fixing bracket are fixedly installed. The fixing bracket is fixed on a mounting seat. The reflector and the fixing bracket are located between the laser displacement sensor and the bottom mold 6. The reflector and the bottom mold 6 rise or fall simultaneously.

[0040] The monitoring system is used to collect and analyze the vibration data of the bottom mold 6 in real time, extract characteristic points through algorithm analysis and perform management and control, and output an alarm signal when the fluctuation exceeds the limit value.

[0041] Specifically, a laser channel is provided on the reflective plate. When the reflective plate moves upward, the laser passes through the laser channel and is projected onto the bottom mold 6, thereby realizing the collection of vibration-related data of the bottom mold 6; when the reflective plate moves downward, the laser is projected onto the reflective plate, and the reflective plate tightly blocks the laser, causing the laser to be reflected back to the laser displacement sensor according to the optical path principle, thereby maintaining the normal acquisition of the sensor signal and ensuring that the vibration measuring component is always in a stable working state.

[0042] According to some embodiments of the present application, the first cylinder driving assembly may be a first pneumatic assembly or a first electric assembly, the first cylinder first pneumatic assembly includes a first proportional valve and a first cylinder, and the first cylinder first electric assembly is a first motor.

[0043] In this embodiment, a first pneumatic assembly is used, including a first proportional valve and a first cylinder. The first proportional valve can accurately output the set air pressure to the first cylinder connected thereto according to a preset value. Driven by the air pressure, the first cylinder will perform corresponding actions to provide a power source for the welding operation. In this way, it can be ensured that the action of the second cylinder has high controllability and accuracy, which is conducive to the stability of the entire welding process.

[0044] In this embodiment, the first cylinder monitoring system includes an acquisition card, a data processing unit and an alarm device. The first cylinder acquisition card is used to acquire the vibration waveform of the bottom mold 6 transmitted by the laser displacement sensor and transmit it to the data processing unit. The first cylinder data processing unit extracts characteristic points through algorithm analysis and performs control. When the fluctuation exceeds the upper and lower limit values, the abnormal welding is output to the alarm device. That is, when the workpiece is welded, the laser displacement sensor will collect the monitored vibration waveform of the bottom mold 6 through the acquisition card and transmit it to the data processing unit. The data processing unit will analyze the acquired vibration waveform. The monitoring system will determine this welding as an abnormal situation and transmit the abnormal information to the alarm device. When the welding is abnormal, the alarm device will be triggered to prompt the operator that the welding is abnormal and the workpiece needs to be inspected so as to promptly discover and solve possible welding problems and ensure welding quality and product reliability.

[0045] In this embodiment, the welding assembly includes a welding head 8, a clamping mechanism, a transducer 2, and an amplitude modulator; under the push of the driving assembly, the clamping mechanism fixes the welding head 8 and the amplitude modulation mechanism to perform synchronous downward pressure, so that the tooth surface of the welding head 8 contacts the welding workpiece.

[0046] According to some embodiments of the present application, the first cylinder bottom mold lifting assembly can be a second pneumatic assembly or a second electric assembly, the first cylinder second pneumatic assembly includes a second proportional valve and a second cylinder, and the first cylinder second electric assembly is a second motor.

[0047] In this embodiment, a second pneumatic assembly is used, including a second proportional valve and a second cylinder. The second proportional valve can accurately output the set air pressure to the first cylinder connected thereto according to a preset value. Driven by the air pressure, the second cylinder will push the bottom mold and the reflector plate up or down.

[0048] According to some embodiments of the present application, there is also provided an ultrasonic welding vibration detection method, comprising the following steps:

[0049] Start welding, the driving assembly pushes the welding head assembly to press down, the bottom mold lifting assembly pushes the bottom mold and the reflector to the set position, and the driving assembly pushes the welding head assembly until the welding head tooth surface contacts the welding workpiece and the bottom mold tooth surface contacts the welding workpiece;

[0050] During the welding process, the vibration of the bottom mold is detected in real time, and the reflector also rises with the bottom mold. The laser beam emitted by the laser displacement sensor passes through the laser channel on the reflector and shoots to the surface of the bottom mold. The laser displacement sensor collects the bottom mold vibration waveform data during the welding process through the acquisition card and transmits it to the monitoring system;

[0051] Welding is completed. After ultrasonic welding is completed, the driving component drives the welding head to lift up, the bottom mold lifting component drives the bottom mold and the reflector to descend, and the laser displacement sensor beam is projected onto the reflector.

[0052] When the welding process starts, Figure 2 As shown in a, the bottom mold and the reflector plate rise under the drive of the bottom mold lifting assembly. At this time, the laser beam emitted by the laser displacement sensor will follow the preset light path, smoothly pass through the laser channel on the reflector plate to the bottom mold surface, and then realize the collection of bottom mold vibration related data; correspondingly, when the welding is completed, such as Figure 2 The reflective plate shown in b starts to move downward with the bottom mold. The reflective plate will cover the laser tightly, causing the laser to be reflected back to the laser displacement sensor according to the optical path principle, thereby maintaining the normal acquisition of the sensor signal and ensuring that the vibration measurement component is always in a stable working state.

[0053] During the welding process, the energy output from the ultrasonic generator system to the welding head is EO; the energy consumed by the welding workpiece is EW; the energy transmitted to the bottom mold is Es; according to the law of conservation of energy, the relationship is Eo=Ew+Es.

[0054] The Eo is a constant set welding energy value (the total energy is unchanged). During welding, the energy transmitted from top to bottom to the bottom mold is Es. Es can be obtained through an algorithm after collecting waveform data through a laser sensor, so that the energy consumed by the welding workpiece can be calculated as EW; when the energy consumed by the welding workpiece EW fluctuates within the set range, it indicates that the welding quality is stable. When the fluctuation of EW exceeds the set range, it indicates that the welding quality is unstable. By monitoring the energy Es on the bottom mold, it can be reversely concluded that the energy consumed by the welding workpiece is Ew. The Es characteristic quantity is obtained through the algorithm for upper and lower line monitoring. When it exceeds the range, the monitor will send out an alarm signal.

[0055] On the one hand, by collecting and monitoring the vibration of the bottom mold, the vibration information during the welding process can be grasped in real time, and then the working status of these components can be inferred. For example, when some characteristic parameters of the bottom mold vibration are abnormal, it may indicate that the current and voltage in the output circuit of the welding machine are unstable, or there is a problem with the energy conversion efficiency of the transducer, and the impact force on the welding head exceeds the normal range. With the help of the bottom mold vibration data, the system can detect these potential risks in advance, so as to take corresponding measures to avoid damage to the above components due to excessive vibration, energy impact or other abnormal conditions, extend their service life, reduce the maintenance cost of the equipment, and ensure the stable operation of the entire ultrasonic welding equipment. On the other hand, this monitoring method can also solve the problem of abnormal welding vibration output caused by changes in workpiece materials. Different workpiece materials have different physical and mechanical properties, and will produce different vibration responses during ultrasonic welding. In the actual production process, there may be batch differences in workpiece materials, replacement of new material suppliers, or slight changes in the material composition of the workpiece itself. These factors may affect the welding effect and vibration output. Through the collection and monitoring of the bottom mold vibration, vibration anomalies caused by changes in workpiece materials can be captured in time, such as changes in vibration amplitude, frequency, and waveform. This embodiment uses amplitude to perform information analysis to ensure that the welding quality is always in a controllable state, avoid welding defects caused by material changes, and improve the overall quality and consistency of the product.

[0056] like Figure 3 As shown in the figure, the complete amplitude data collected by this embodiment includes the waveform collected by the laser vibration sensor when the welding machine is stationary, the waveform collected by the middle section when the ultrasonic wave is emitted, and the waveform collected when the welding head bottom film returns to its original position. By properly setting the metal reflector, the entire measurement system can obtain a relatively stable measurement signal regardless of whether it is in the welding process or the non-welding process. The amplitude data covers the vibration information of the entire stage from the beginning to the end of the ultrasonic welding process. Figure 4 This is the waveform diagram of the intercepted t1-t2. Figure 4 The laser beam emitted by the laser displacement sensor passes through the laser channel on the reflective plate to obtain data information on the bottom mold surface. This information is analyzed to judge the welding quality, ensure that the quality of ultrasonic welding meets the expected standards, and improve the reliability and consistency of the product.

[0057] Figure 5 and Figure 6 The characteristic value calculation of the data collected through multiple welding processes is shown. Figure 5 is the calculation graph of the first eigenvalue, Figure 6This is the calculation diagram of the second eigenvalue. These data are obtained by performing multiple rounds of ultrasonic welding process and using the corresponding monitoring system. They cover the change information of multiple key parameters in the welding process, and they provide a rich data basis for the subsequent welding quality analysis. After a large amount of data calculation and analysis, a set of welding quality judgment criteria are established. If the first eigenvalue and the second eigenvalue are within the set range, the welding quality is good. If the first eigenvalue or the second eigenvalue is below the horizontal line outside the set range, the welding is abnormal. The energy transfer and conversion efficiency in the ultrasonic welding process are as expected, and the welding materials can be well combined, thereby ensuring the strength and stability of the welded joint and meeting the quality requirements of the product. On the contrary, if the calculated welding characteristic value exceeds the set range, the quality of the welding is judged to be problematic.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An ultrasonic welding vibration measuring structure, comprising a driving component, a welding component, a bottom mold, a vibration measuring component and a monitoring component, characterized in that: A driving assembly, which is used to control the up and down movement of the welding assembly; A bottom mold lifting assembly drives the bottom mold to move up and down, and a mounting seat is provided below the bottom mold. The vibration measuring assembly comprises a laser displacement sensor, a reflector and a fixing bracket, wherein the reflector is fixedly mounted on the fixing bracket, the fixing bracket is fixed on the mounting seat, the reflector and the fixing bracket are located between the laser displacement sensor and the bottom mold, and the reflector and the bottom mold rise or fall simultaneously; The monitoring system is used to collect and analyze the bottom mold vibration data in real time, extract characteristic points through algorithm analysis and perform management and control, and output an alarm signal when the fluctuation exceeds the limit value.

2. The ultrasonic welding vibration measuring structure according to claim 1, characterized in that: The reflective plate is provided with a laser channel. When the reflective plate moves upward, the laser passes through the laser channel and is projected onto the bottom mold. When the reflective plate moves downward, the laser is projected onto the reflective plate.

3. The ultrasonic welding vibration measuring structure according to claim 2, characterized in that: The driving component may be a first pneumatic component or a first electric component, the first pneumatic component includes a first proportional valve and a first cylinder, and the first electric component is a first motor.

4. The ultrasonic welding vibration measuring structure according to claim 2, characterized in that: The monitoring system includes an acquisition card, a data processing unit and an alarm device. The acquisition card is used to collect the bottom mold vibration waveform transmitted by the laser displacement sensor and transmit it to the data processing unit. The data processing unit extracts characteristic points through algorithm analysis and performs control. When the fluctuation exceeds the upper and lower limit values, the abnormal welding is output to the alarm device.

5. The ultrasonic welding vibration measuring structure according to claim 2, characterized in that: The bottom mold lifting component can be a second pneumatic component or a second electric component, the second pneumatic component includes a second proportional valve and a second cylinder, and the second electric component is a second motor.

6. The ultrasonic welding vibration measuring structure according to claim 1, characterized in that: The laser displacement sensor is installed on the ultrasonic welding frame, and the laser displacement sensor is connected to the monitoring system for communication, and collects the bottom mold vibration data and transmits it to the monitoring system.

7. An ultrasonic welding vibration detection method, using the welding vibration detection structure according to any one of claims 1 to 6, characterized in that: The steps include: Start welding, the driving assembly pushes the welding head assembly to press down, the bottom mold lifting assembly pushes the bottom mold and the reflector to the set position, and the driving assembly pushes the welding head assembly until the welding head tooth surface contacts the welding workpiece and the bottom mold tooth surface contacts the welding workpiece; During the welding process, the vibration of the bottom mold is detected in real time, and the reflector also rises with the bottom mold. The laser beam emitted by the laser displacement sensor passes through the laser channel on the reflector and shoots to the surface of the bottom mold. The laser displacement sensor collects the bottom mold vibration waveform data during the welding process through the acquisition card and transmits it to the monitoring system; Welding is completed. After ultrasonic welding is completed, the driving component drives the welding head to lift up, the bottom mold lifting component drives the bottom mold and the reflector to descend, and the laser displacement sensor beam is projected onto the reflector.

8. The ultrasonic welding vibration detection method according to claim 6, characterized in that: During the welding process, the energy output from the ultrasonic generator system to the welding head is EO; the energy consumed by the welding workpiece is EW; the energy transmitted to the bottom mold is Es; according to the law of conservation of energy, the relationship is Eo=Ew+Es.

9. The ultrasonic welding vibration detection method according to claim 7, characterized in that: The Eo is a constant set welding energy value. During welding, the energy transmitted from top to bottom to the bottom mold is Es. Es can be obtained through an algorithm after collecting waveform data through a laser sensor, so that the energy consumed by the welding workpiece can be calculated as EW; when the energy consumed by the welding workpiece EW fluctuates within the set range, it indicates that the welding quality is stable. When the fluctuation of EW exceeds the set range, it indicates that the welding quality is unstable. By monitoring the energy Es on the bottom mold, it can be reversely concluded that the energy consumed by the welding workpiece is Ew. The Es characteristic quantity is obtained through the algorithm for upper and lower line monitoring. When it exceeds the range, the monitor will send out an alarm signal.

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