Resistance spot welding spatter inhibition method with piezoelectric driving active pressure application

A resistance spot welding and piezoelectric drive technology, applied in resistance welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of poor solder joint forming effect, increase welding pressure, spatter solder joint strength, etc., and reduce subsequent inspections. process, improve accuracy, reduce the effect of spatter defects

Active Publication Date: 2020-07-03
BEIJING UNIV OF TECH
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Problems solved by technology

In addition, some studies have pointed out that as the welding current increases, the size of the nugget increases. When the current just exceeds the critical point, severe spatter will be generated and the strength of the solder joint will be reduced. If the welding current is further increased, Although the nugget will further increase and show higher strength, the weld joint formation effect is not good; in addition, by increasing the welding pressure, the time for resistance spot welding to reach the critical spatter point can be delayed, which helps to reduce spatter butt welding Effect of nuclear strength

Method used

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  • Resistance spot welding spatter inhibition method with piezoelectric driving active pressure application

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Embodiment Construction

[0021] Embodiments of the present invention will be specifically described below with reference to the drawings.

[0022] First, the pressure sensor 3 is installed in the cylinder 2 or the electrode arm to measure the electrode pressure, and the output data of the pressure sensor is connected to the port of the control unit 6 through the pressure sensor connection line 9, and the control unit 6 is connected to the industrial computer 7. The piezoelectric actuator control signal output by the software system is connected to the piezoelectric actuator driver 8 through the control power supply 6 , and connected to the piezoelectric actuator 4 through the connecting line 10 . The piezoelectric actuator 4, including but not limited to, is installed in the electrode pressure output shaft through upper and lower bolts.

[0023] Then, turn on the resistance spot welding spatter defect monitoring system in the industrial computer 7, set corresponding parameters and run the system. Aft...

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Abstract

The invention discloses a resistance spot welding spatter inhibition method with piezoelectric driving active pressure application. The method comprises the following steps that an electrode pressuresignal in the resistance spot welding process is acquired in real time, a system software program identifies an early spatter characteristic signal in real time when the early spatter characteristic signal is about to occur, a control unit is rapidly triggered to send out feedback control signal to enter a piezoelectric actuator driver, the piezoelectric actuator is actively controlled to performprogrammable pressure output, so that the spot welding electrode pressure is supplemented in an online closed-loop manner to inhibit spatter. According to the method, integration of spot welding quality detection and real-time control is achieved, spot welding spatter is restrained fundamentally, it is guaranteed that the resistance spot welding process is stable, and the welding spot quality is improved.

Description

technical field [0001] The invention relates to a novel piezoelectric-driven active pressure control method for spatter defects in resistance spot welding, which belongs to the field of welding quality monitoring. Background technique [0002] Resistance spot welding is a welding process that melts metal by resistive heat and applies a certain pressure to form the metal. The process involves multiphysics coupling and the welding process is invisible. Resistance spot welding is widely used in the fields of aviation, aerospace, energy, electronics and rail transit because of its high efficiency, low cost, and easy automation. Especially in the automotive industry, it is still the main means of metal connection. A typical car The car body is assembled from 300 to 400 thin plate parts and 3000 to 6000 solder joints. Therefore, the quality of solder joints and subsequent inspection procedures will directly affect the reliability and production efficiency of the welded structure. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/36
CPCB23K11/11B23K11/36
Inventor 陈树君邬娜肖珺卢振洋李天明胡超雄
Owner BEIJING UNIV OF TECH
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