CN105149762A - Resistance spot welding quality evaluation device - Google Patents
Resistance spot welding quality evaluation device Download PDFInfo
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- CN105149762A CN105149762A CN201510572388.7A CN201510572388A CN105149762A CN 105149762 A CN105149762 A CN 105149762A CN 201510572388 A CN201510572388 A CN 201510572388A CN 105149762 A CN105149762 A CN 105149762A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
- B23K11/255—Monitoring devices using digital means the measured parameter being a force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
- B23K11/257—Monitoring devices using digital means the measured parameter being an electrical current
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
- B23K11/258—Monitoring devices using digital means the measured parameter being a voltage
Abstract
The invention discloses a resistance spot welding quality evaluation device. A welding parameter detection and welding point quality evaluation system with an STM 32 single chip microcomputer as a development platform is adopted, an embedded development technology is adopted, problems of signal isolation and the like are considered, the welding current, electrode pressure, voltage among electrodes and electrode displacement signals in the work process of a spot welding machine are collected, data are processed, then the characteristic quantity of a signal time domain is extracted, the data are input to an expert system, and on-line evaluation is conducted on the welding point quality through inference of the expert system.
Description
Technical field
The present invention relates to Qualitative Evaluation of Resistance Spot Welding field, be specifically related to Qualitative Evaluation of Resistance Spot Welding device.
Background technology
Up to the present, about the research of point quality detecting & monitoring technology has decades, propose the method for tens kinds altogether, but the maximum difficulty of quality of welding spot detecting & monitoring, still be embodied in and the quality informations such as nugget size cannot directly and fast be measured, indirectly can only be inferred by the coherent signal of welding process, up to the present, still lack effective and general practical method.In actual production, point quality is ensured by process for stabilizing parameter in welding process and postwelding sampling destructive test.Because influence factor is more, stable technological parameter can not ensure quality of welding spot for a long time.The detection method poor real of postwelding inspection, can not Timeliness coverage welding point defect, realize welding quality on-line monitoring, therefore develop a kind of online, easily, the high quality assessment system of non-destructive, low cost, diagnostic reliability is produced for reality and widely using of resistance spot welding method is significantly.
Existing point quality detection system mainly contains two kinds of configuration modes: 1. sensor-data collecting card-PC (host computer); 2. sensor-single-chip microcomputer-PC, the system bulk of these two kinds of configuration modes is large, cost is high, portability is poor, installation and debugging are inconvenient.
Summary of the invention
For solving the problem, the invention provides a kind of Qualitative Evaluation of Resistance Spot Welding device, the welding parameter detecting being development platform with STM32 single-chip microcomputer and quality of welding spot evaluation system, adopt embedded development technology, consider the problems such as signal isolation, by the welding current in the welding machine course of work of collection point, electrode pressure, inter-electrode voltage, electrode displacement signals during resistance, data are processed to the characteristic quantity of rear extraction signal time domain, be entered in expert system, through the reasoning of expert system, the quality of butt welding point is passed judgment on online.
For achieving the above object, the technical scheme that the present invention takes is:
Qualitative Evaluation of Resistance Spot Welding device, comprises
Current sensor, for detecting the welding current signal in welding process;
Electrode pressure sensor, for detecting the electrode pressure signal in welding process;
Electrode displacement sensor, for detecting the electrode displacement signals during resistance in welding process;
Voltage sensor, for detecting the inter-electrode voltage signal in welding process;
Sensor periphery circuit module, for being the sensor, and each power device is powered;
Single-chip microcomputer, for controlling the sensor and receiving the data that detect of the sensor;
Data processing module, for the treatment of the data that above-mentioned microprocessor detect arrives;
Data storage module, for storing the data that above-mentioned microprocessor detect arrives;
Data disaply moudle, for the data that above-mentioned display microprocessor detect arrives;
User-machine interface, carries out touch operation and control for operator to device;
Expert system module, for carrying out reasoning assessment to the above-mentioned data detected;
And alarm module.
Wherein, described current sensor adopts flexible open-close type Luo-coil.
Wherein, described electrode pressure sensor adopts absolute pressure pressure sensor.
Wherein, described electrode displacement sensor adopts laser displacement sensor, and described single-chip microcomputer adopts STM32F103VE single-chip microcomputer, and this chip is with 32 High Performance SCMs of 100 pins of LPFQ encapsulation.
Wherein, described user-machine interface adopts 4.3 inches of LCD liquid crystal display screen of tangible operation, operator only needs to carry out to touch-screen the data etc. that touch operation just can realize in the setting of systematic parameter, the switching of function interface, management system, the exploitation of system interface uses uC/GUI to design, the interface content designed is written as C language code, is then transplanted to SMT32
Wherein, described sensor periphery circuit module comprises microcomputer development plate, laser displacement sensor, sieve formula coil, photoelectric isolation module, alarm module and pressure sensor module, alternating current 220V voltage is through transformation, rectification, Voltage stabilizing module, export direct current 5V, for single-chip microcomputer and photoelectric isolation module, it is described laser displacement sensor, sieve formula coil power supply that direct current 5V converts 13V to by boost module, by single-chip microcomputer, the operating voltage of sensor assembly is set to 3.3V.。
Wherein, described photoelectric isolation module is voltage-type input, the full isolated form amplifier of photoelectricity, and model is ISO-U1-P3-O4, and the upper/lower electrode of mash welder and signal acquiring system are effectively isolated.
The present invention has following beneficial effect:
System bulk is little, cost is low, it is easy for installation to carry, while the collection of welding current when achieving spot welding, inter-electrode voltage, electrode pressure, electrode displacement signals during resistance, also expert system can be used to carry out again line to point quality pass judgment on, also can realize the recommendation to welding condition simultaneously.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the embodiment of the present invention.
Fig. 2 is sensor scheme of installation in the embodiment of the present invention
Fig. 3 is system power supply allocation plan in the embodiment of the present invention
Fig. 4 is system power supply configuration circuit figure in the embodiment of the present invention.
Fig. 5 is the operational flowchart of multiple solutions in the embodiment of the present invention
Fig. 6 is AD collecting flowchart figure in the embodiment of the present invention.
Fig. 7 is point-by-point integration algorithm flow chart in the embodiment of the present invention
Fig. 8 is the schematic diagram of material file in the embodiment of the present invention
Fig. 9 is the schematic diagram of knowledge file in the embodiment of the present invention.
Detailed description of the invention
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, embodiments provide a kind of Qualitative Evaluation of Resistance Spot Welding device, comprise
Current sensor, for detecting the welding current signal in welding process;
Electrode pressure sensor, for detecting the electrode pressure signal in welding process;
Electrode displacement sensor, for detecting the electrode displacement signals during resistance in welding process;
Voltage sensor, for detecting the inter-electrode voltage signal in welding process;
Sensor periphery circuit module, for being the sensor, and each power device is powered;
Single-chip microcomputer, for controlling the sensor and receiving the data that detect of the sensor;
Data processing module, for the treatment of the data that above-mentioned microprocessor detect arrives;
Data storage module, for storing the data that above-mentioned microprocessor detect arrives;
Data disaply moudle, for the data that above-mentioned display microprocessor detect arrives;
User-machine interface, carries out touch operation and control for operator to device;
Expert system module, for carrying out reasoning assessment to the above-mentioned data detected;
And alarm module.
Native system is built in STM32-V5 development platform, and the processor on development board is STM32F103VE single-chip microcomputer, and this chip is with 32 High Performance SCMs of 100 pins of LPFQ encapsulation.
The Luo-coil used in native system is the flexible open-close type Luo-coil that Chuan Yin Science and Technology Co., Ltd. of Shenzhen produces, and model is CY-RCTA02-Φ 120, and Specifeca tion speeification is as follows: measure range 30 ~ 15000A; Output signal 3000mV12000A50Hz; The degree of accuracy ± 1%; Phase error ± 1 degree; The linearity ± 0.2%; Site error ± 2%.
As shown in Figure 2, when this concrete enforcement is installed: voltage detecting only needs signal collecting device to be connected in the upper/lower electrode of mash welder via wire by isolated amplifier; Electrode pressure detects and connects a threeway by the pressure cylinder of the moving electrode of resistance spot weld, then is connected to pressure sensor by gas conduit, the output connection signal collecting device of pressure sensor; Displacement detecting is wired to signal collecting device to realize by the laser displacement sensor be arranged on magnetic absorbing seat; Luo-coil is enclosed within the connection wire of the stationary electrode of resistance spot weld by current detecting, then the output of Luo-coil is connected on signal collecting device.
As shown in Figure 7, the present invention asks the method for current effective value to adopt integral point by point.
The pressure sensor that native system adopts is the MPX5700AP absolute pressure pressure sensor that Freescal company produces, and is the single piece of silicon pressure sensor of a kind of advanced person, maximum range 7KPa.
The electrode displacement order of magnitude is very little, and general tens microns, to more than 100 microns, require very high to the certainty of measurement of sensor.Native system uses the HL-G1 series laser sensor of Panasonic, and model is HL-G108-A-C5.
The isolation module that native system adopts is voltage-type input, the full isolated form amplifier of photoelectricity, and model is ISO-U1-P3-O4, and the upper/lower electrode of mash welder and signal acquiring system are effectively isolated.
Native system circuit part forms primarily of six modules, be respectively microcomputer development plate, laser displacement sensor, sieve formula coil, isolation module, alarm module and pressure sensor, supply voltage required when modules normally works is different, the power configuration scheme of system as shown in Figure 3-4, alternating current 220V voltage is through transformation, rectification, Voltage stabilizing module, export direct current 5V, for single-chip microcomputer and photoelectric isolation module; Pressure sensor MPX5700 normal working voltage is 0.2-4.7V, sets it to 3.3V in the design by single-chip microcomputer, can ensure its maximum certainty of measurement; Luo-coil and laser displacement sensor operating voltage are direct current 13V, and the voltage after transformation, rectification is direct current 5V, therefore also need a boost module, and 5V voltage is risen to 13V.
The present invention is using the user-machine interface of the LCDs of 4.3 inches as native system, operator only needs to carry out to touch-screen the data etc. that touch operation just can realize in the setting of systematic parameter, the switching of function interface, management system, the exploitation of system interface uses uC/GUI to design, the interface content designed is written as C language code, then be transplanted on SMT32, concrete operations flow process as shown in Figure 5.In resistance spot welding process, the inter-electrode voltage of detection system collection, electrode pressure, welding current, electrode displacement signals during resistance are time dependent signal, observe the change of these parameters for convenience, and native system devises the display interface of a data and curves.This interface uses the Graph control of uC/GUI to realize, and can show the time graph of the welding current of a solder joint, inter-electrode voltage, electrode displacement and electrode pressure.
STM32F103VE singlechip chip is integrated with analog/digital converter, the successive approximation type a/d converter of 3 12 bit resolutions can be configured at most, be employed herein four passages of ADC1, voltage signal between the 1st passage (A0 pin) acquisition electrode, 2nd passage (A2 pin) gathers welding current signal, 10th passage (C0 pin) acquisition electrode displacement signal, the 11st passage (C1 pin) acquisition electrode pressure signal.The AD sample frequency set in program is 10kHz, and the number of image data was directly proportional to the weld interval (cycle) of setting, sets a cycle (20ms) and gather 200 data in program; The collection of data is by the software trigging control of inside, when the AD sampled value of welding current is greater than 300, software triggers and starts, system AD starts image data, system self-clocking, when the time reaches the cycle of setting, capture program stops automatically, stops after 2 seconds, software could realize again triggering, and AD collecting flowchart figure is shown in Fig. 6.
Native system, is extracted shearing resistance data that U.S. resistance welding machine manufactures welding condition that association (RWMA) provides and the previous experiments solder joint knowledge as expert system in table 1:
Table 1 welding condition
Welding performance due to different materials is different, thus its welding procedure, welding parameter is different, the user of native system can according to oneself need carry out adding material, then obtain the expertise (welding parameter) of this material, to leave under the root of RAM card in knowledge.txt file, automatically relevant knowledge will be read after system electrification, and then the assessment of expert system butt welding point quality can be realized, material file is shown in Fig. 8, and knowledge file is shown in Fig. 9.
Wherein, in Fig. 9, wherein a represents the thickness of welding work pieces, and unit is mm, b represents the diameter of electrode sections, and unit is the minimum range that mm, c represent between two solder joints, unit is the minimum range that mm, d represent the workpiece overlap joint that will weld together, and unit is mm, pressure during e representative welding between upper/lower electrode, unit is that N, f represent weld interval, and unit is cycle (a cycle 0.02s), g represents the size of welding current, and unit is A.
Expert system interface and optimum configurations interface share same interface, while can being arranged system relevant parameter and acquisition parameter by interface, also can realize expert system by the thickness of selection material kind and welding work pieces and mirror is pushed away to welding condition.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. Qualitative Evaluation of Resistance Spot Welding device, is characterized in that, comprises
Current sensor, for detecting the welding current signal in welding process;
Electrode pressure sensor, for detecting the electrode pressure signal in welding process;
Electrode displacement sensor, for detecting the electrode displacement signals during resistance in welding process;
Voltage sensor, for detecting the inter-electrode voltage signal in welding process;
Sensor periphery circuit module, for being the sensor, and each power device is powered;
Single-chip microcomputer, for controlling the sensor and receiving the data that detect of the sensor;
Data processing module, for the treatment of the data that above-mentioned microprocessor detect arrives;
Data storage module, for storing the data that above-mentioned microprocessor detect arrives;
Data disaply moudle, for the data that above-mentioned display microprocessor detect arrives;
User-machine interface, carries out touch operation and control for operator to device;
Expert system module, for carrying out reasoning assessment to the above-mentioned data detected.
And alarm module.
2. Qualitative Evaluation of Resistance Spot Welding device according to claim 1, is characterized in that, described current sensor adopts flexible open-close type Luo-coil.
3. Qualitative Evaluation of Resistance Spot Welding device according to claim 1, is characterized in that, described electrode pressure sensor adopts absolute pressure pressure sensor.
4. Qualitative Evaluation of Resistance Spot Welding device according to claim 1, is characterized in that, described electrode displacement sensor adopts laser displacement sensor, and described single-chip microcomputer adopts STM32F103VE single-chip microcomputer.
5. Qualitative Evaluation of Resistance Spot Welding device according to claim 1, is characterized in that, described user-machine interface adopts 4.3 inches of LCD liquid crystal display screen of tangible operation.
6. Qualitative Evaluation of Resistance Spot Welding device according to claim 1, it is characterized in that, described sensor periphery circuit module comprises microcomputer development plate, laser displacement sensor, sieve formula coil, photoelectric isolation module, alarm module and pressure sensor module, alternating current 220V voltage is through transformation, rectification, Voltage stabilizing module, export direct current 5V, for single-chip microcomputer and photoelectric isolation module, it is described laser displacement sensor, sieve formula coil power supply that direct current 5V converts 13V to by boost module, by single-chip microcomputer, the operating voltage of sensor assembly is set to 3.3V.
7. Qualitative Evaluation of Resistance Spot Welding device according to claim 6, it is characterized in that, described photoelectric isolation module is voltage-type input, the full isolated form amplifier of photoelectricity, and model is ISO-U1-P3-04, and the upper/lower electrode of mash welder and signal acquiring system are effectively isolated.
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| CN201510572388.7A CN105149762A (en) | 2014-12-27 | 2015-09-04 | Resistance spot welding quality evaluation device |
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| CN2014108490668 | 2014-12-27 | ||
| CN201510572388.7A CN105149762A (en) | 2014-12-27 | 2015-09-04 | Resistance spot welding quality evaluation device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105689875A (en) * | 2016-03-26 | 2016-06-22 | 广州微点焊设备有限公司 | Three-axis linkage automatic welding equipment |
| CN105689876A (en) * | 2016-03-26 | 2016-06-22 | 广州微点焊设备有限公司 | Resistance spot welding machine capable of automatically monitoring welding quality |
| CN106019066A (en) * | 2016-05-12 | 2016-10-12 | 合肥加亦信息科技有限公司 | Photovoltaic cell panel junction box terminal welding quality test system |
| CN106091907A (en) * | 2016-06-03 | 2016-11-09 | 常州市武进区半导体照明应用技术研究院 | A kind of solder joint displacement real non-destructive monitoring method |
| CN106624313A (en) * | 2017-02-16 | 2017-05-10 | 艾因蒂克检测科技（上海）股份有限公司 | On-line detecting system and method for spot welding |
| CN107283038A (en) * | 2016-04-13 | 2017-10-24 | 泰克纳股份公司 | Resistance welding equipment |
| CN107486609A (en) * | 2017-09-01 | 2017-12-19 | 上海带轨道焊接科技有限公司 | A kind of welding current whole process actual measurement system and data sampling and processing and display methods |
| CN108188560A (en) * | 2017-12-12 | 2018-06-22 | 广州亨龙智能装备股份有限公司 | Hand-held electric resistance welding Quality Monitoring Control System based on linux system |
| CN108465928A (en) * | 2017-02-23 | 2018-08-31 | 康茂股份公司 | Resistance soldering tip with the electrode on same side |
| CN109093240A (en) * | 2018-10-31 | 2018-12-28 | 中正智控（江苏）智能科技有限公司 | Medium frequency inverter direct current welding quality monitoring method and monitoring system |
| CN109108445A (en) * | 2018-11-05 | 2019-01-01 | 南京菲斯特焊接科技有限公司 | A kind of suspension type electric resistance electric arc welder welding process parameter monitor and monitoring method |
| CN109931879A (en) * | 2019-03-29 | 2019-06-25 | 上海交通大学 | On-line Measuring Method based on the pad surface depth of cup of displacement signal between electrode |
| CN110494249A (en) * | 2017-03-31 | 2019-11-22 | 杰富意钢铁株式会社 | The welding decision maker and welding determination method of band-like plate body |
| CN111014924A (en) * | 2019-11-19 | 2020-04-17 | 西安石油大学 | Real-time monitoring method for detecting resistance spot welding parameters |
| CN111299786A (en) * | 2019-07-01 | 2020-06-19 | 北京实耐固连接技术有限公司 | Intelligent resistance welding clamp system |
| EP3766622A4 (en) * | 2018-03-15 | 2021-12-08 | Omron Corporation | Evaluation system and evaluation method |
| CN114147382A (en) * | 2021-12-14 | 2022-03-08 | 吉林大学 | Electric and ultrasonic signal composite resistance spot welding quality on-line monitoring method and device |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105689876B (en) * | 2016-03-26 | 2019-03-26 | 广州微点焊设备有限公司 | The resistance spot weld welding machine of automatic monitoring welding quality |
| CN105689876A (en) * | 2016-03-26 | 2016-06-22 | 广州微点焊设备有限公司 | Resistance spot welding machine capable of automatically monitoring welding quality |
| CN105689875A (en) * | 2016-03-26 | 2016-06-22 | 广州微点焊设备有限公司 | Three-axis linkage automatic welding equipment |
| CN107283038A (en) * | 2016-04-13 | 2017-10-24 | 泰克纳股份公司 | Resistance welding equipment |
| CN107283038B (en) * | 2016-04-13 | 2021-09-28 | 泰克纳股份公司 | Resistance welding equipment |
| CN106019066A (en) * | 2016-05-12 | 2016-10-12 | 合肥加亦信息科技有限公司 | Photovoltaic cell panel junction box terminal welding quality test system |
| CN106091907A (en) * | 2016-06-03 | 2016-11-09 | 常州市武进区半导体照明应用技术研究院 | A kind of solder joint displacement real non-destructive monitoring method |
| CN106091907B (en) * | 2016-06-03 | 2019-01-08 | 常州市武进区半导体照明应用技术研究院 | A kind of solder joint displacement real non-destructive monitoring method |
| CN106624313A (en) * | 2017-02-16 | 2017-05-10 | 艾因蒂克检测科技（上海）股份有限公司 | On-line detecting system and method for spot welding |
| CN108465928B (en) * | 2017-02-23 | 2022-03-04 | 康茂股份公司 | Resistance welding head with electrodes on the same side |
| CN108465928A (en) * | 2017-02-23 | 2018-08-31 | 康茂股份公司 | Resistance soldering tip with the electrode on same side |
| CN110494249A (en) * | 2017-03-31 | 2019-11-22 | 杰富意钢铁株式会社 | The welding decision maker and welding determination method of band-like plate body |
| CN107486609A (en) * | 2017-09-01 | 2017-12-19 | 上海带轨道焊接科技有限公司 | A kind of welding current whole process actual measurement system and data sampling and processing and display methods |
| CN107486609B (en) * | 2017-09-01 | 2019-06-11 | 上海一带轨道焊接科技有限公司 | A kind of welding current whole process actual measurement system and data sampling and processing and display methods |
| CN108188560B (en) * | 2017-12-12 | 2020-06-09 | 广州亨龙智能装备股份有限公司 | Handheld resistance welding quality monitoring system based on Linux system |
| CN108188560A (en) * | 2017-12-12 | 2018-06-22 | 广州亨龙智能装备股份有限公司 | Hand-held electric resistance welding Quality Monitoring Control System based on linux system |
| EP3766622A4 (en) * | 2018-03-15 | 2021-12-08 | Omron Corporation | Evaluation system and evaluation method |
| US11724332B2 (en) | 2018-03-15 | 2023-08-15 | Omron Corporation | Evaluation system and evaluation method |
| CN109093240A (en) * | 2018-10-31 | 2018-12-28 | 中正智控（江苏）智能科技有限公司 | Medium frequency inverter direct current welding quality monitoring method and monitoring system |
| CN109108445A (en) * | 2018-11-05 | 2019-01-01 | 南京菲斯特焊接科技有限公司 | A kind of suspension type electric resistance electric arc welder welding process parameter monitor and monitoring method |
| CN109931879A (en) * | 2019-03-29 | 2019-06-25 | 上海交通大学 | On-line Measuring Method based on the pad surface depth of cup of displacement signal between electrode |
| CN111299786A (en) * | 2019-07-01 | 2020-06-19 | 北京实耐固连接技术有限公司 | Intelligent resistance welding clamp system |
| CN111014924A (en) * | 2019-11-19 | 2020-04-17 | 西安石油大学 | Real-time monitoring method for detecting resistance spot welding parameters |
| CN114147382A (en) * | 2021-12-14 | 2022-03-08 | 吉林大学 | Electric and ultrasonic signal composite resistance spot welding quality on-line monitoring method and device |
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